CN117352926A - Battery cell, battery module and battery pack - Google Patents

Battery cell, battery module and battery pack Download PDF

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Publication number
CN117352926A
CN117352926A CN202311378547.0A CN202311378547A CN117352926A CN 117352926 A CN117352926 A CN 117352926A CN 202311378547 A CN202311378547 A CN 202311378547A CN 117352926 A CN117352926 A CN 117352926A
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CN
China
Prior art keywords
shell
housing
pressure relief
strength
mpa
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.)
Pending
Application number
CN202311378547.0A
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Chinese (zh)
Inventor
袁跃
候占瑞
李俭
杨红新
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Svolt Energy Technology Wuxi Co Ltd
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Svolt Energy Technology Wuxi Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Svolt Energy Technology Wuxi Co Ltd filed Critical Svolt Energy Technology Wuxi Co Ltd
Priority to CN202311378547.0A priority Critical patent/CN117352926A/en
Publication of CN117352926A publication Critical patent/CN117352926A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—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
    • H01M50/10—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
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/20—Pressure-sensitive devices
    • 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)

Abstract

The invention relates to the field of batteries, in particular to a battery cell, a battery module and a battery pack. The battery cell comprises a shell, a pole and a pressure relief part; the shell is provided with a plurality of bearing areas, and the pole and the pressure relief part are arranged on the shell through different bearing areas; the mechanical performance parameters of the shell include: the tensile strength a of the shell, the yield strength b of the shell and the compressive strength c of the shell; the overall structural strength sigma of the shell is a multiplied by 10 ‑2 +b×10 ‑2 The method comprises the steps of carrying out a first treatment on the surface of the The safety performance parameters of the shell include: shear strength τ of the shell; sigma and tau satisfy:and/or the security performance parameters of the housing include: opening pressure p of the pressure relief part; sigma and p satisfy:and/or security performance parameter package of the shellThe method comprises the following steps: the total area of all bearing areas accounts for the proportion f of the surface area of the shell; sigma and f satisfy:the battery cell provided by the invention has the advantages that the ratio range between the structural strength of the battery cell shell and different safety performance parameters of the shell is limited, so that the battery cell can be compatible with the structural strength and the safety performance.

Description

Battery cell, battery module and battery pack
Technical Field
The invention relates to the field of batteries, in particular to a battery cell, a battery module and a battery pack.
Background
Along with the development of new energy industry, the electric automobile is a great direction of future development of automobile industry, and the power battery is used as a core component of the electric automobile, so that the popularization and application of the electric automobile are directly affected by the working safety performance. The mechanical strength, the thermal management performance, the power performance and the safety are mainly considered when the power battery is designed, wherein the mechanical strength of the power battery is a core problem, the shell structural strength of the battery core of the battery directly influences the safety of the whole vehicle under normal running working conditions and under extreme working conditions such as rolling and collision, the structural strength and the safety performance cannot be considered in the existing battery core, and if the shell is broken in the running process of the battery core, the explosion-proof valve cannot be normally opened, so that a safety accident is caused.
Disclosure of Invention
Accordingly, an object of the present application is to provide a battery cell, a battery module and a battery pack, so as to solve the problem that the existing battery cell cannot achieve both structural strength and safety performance, thereby easily causing a safety accident.
The first aspect of the invention provides a battery cell, wherein the battery cell comprises a shell, a pole and a pressure relief part; the shell is provided with a plurality of bearing areas, and the polar posts and the pressure relief part are arranged on the shell through different bearing areas;
the mechanical performance parameters of the shell comprise: the tensile strength a of the shell is expressed in Mpa; the yield strength b of the shell is expressed in Mpa; and the compressive strength c of the shell in Mpa;
the overall structural strength sigma of the shell is a multiplied by 10 -2 +b×10 -2 ；
The safety performance parameters of the shell comprise: the shear strength tau of the shell is expressed in Mpa;
sigma and tau satisfy the following relationship:
and/or, the safety performance parameters of the shell comprise: the opening pressure p of the pressure relief part is expressed in Mpa;
sigma and p satisfy the following relationship:
and/or, the safety performance parameters of the shell comprise: the total area of all the bearing areas accounts for the proportion f of the surface area of the shell;
sigma and f satisfy the following relationship:
preferably, the tensile strength a of the shell is 315 Mpa-406 Mpa; the yield strength b of the shell is 156 Mpa-286 Mpa; the compressive strength c of the shell is 4.3 Mpa-8.5 Mpa.
Preferably, the shear strength τ of the shell is 25Mpa to 50Mpa.
Preferably, the opening pressure p of the pressure relief portion is 1.2Mpa to 2.6Mpa.
Preferably, the total area of all the bearing areas accounts for 0.1% -10% of the surface area f of the shell.
Preferably, the pressure relief part is at least one; the pressure relief portion is disposed on at least one end face of the housing.
Preferably, the housing comprises a cover plate, the bearing area is arranged on the cover plate, and the cover plate is positioned at least one end of the housing;
the body of the housing and the cover plate are formed in a split structure, or the body of the housing and the cover plate are formed in an integrated structure.
Preferably, the electrode post comprises a positive electrode post and a negative electrode post;
the positive pole and the negative pole are arranged on two sides of the shell, or the positive pole and the negative pole are arranged on the same side of the shell.
The second aspect of the invention provides a battery module, which comprises the battery cell according to any one of the above technical schemes.
The third aspect of the invention provides a battery pack, which comprises the battery module.
Compared with the prior art, the invention has the beneficial effects that:
according to the battery cell, the ratio range between the structural strength of the battery cell shell and different safety performance parameters of the shell is limited, so that the battery cell shell can meet the safety performance requirement while having enough structural strength, the situation that the pressure release part cannot be normally opened due to shell rupture in the operation process of the battery cell is avoided, the safe operation of the battery cell is ensured, and the use safety of the battery module and the battery pack is further ensured.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a battery cell according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a battery cell according to an embodiment of the present invention under another view angle;
fig. 3 is a schematic structural diagram of a battery cell in a comparative example provided in an embodiment of the present invention in a thermal runaway state;
fig. 4 is a schematic view of another view angle structure of the battery cell in the comparative example provided in the embodiment of the invention in a thermal runaway state.
Icon: 100-a housing; 101-an anode cover plate; 102-a negative electrode cover plate; 110-positive electrode posts; 120-negative pole column; 200-pressure release part.
Detailed Description
The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, apparatus, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be apparent after an understanding of the present disclosure. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but rather, obvious variations may be made upon an understanding of the present disclosure, other than operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.
The features described herein may be embodied in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein have been provided solely to illustrate some of the many possible ways of implementing the methods, devices, and/or systems described herein that will be apparent after a review of the disclosure of the present application.
In the entire specification, when an element (such as a layer, region or substrate) is described as being "on", "connected to", "bonded to", "over" or "covering" another element, it may be directly "on", "connected to", "bonded to", "over" or "covering" another element or there may be one or more other elements interposed therebetween. In contrast, when an element is referred to as being "directly on," directly connected to, "or" directly coupled to, "another element, directly on," or "directly covering" the other element, there may be no other element intervening therebetween.
As used herein, the term "and/or" includes any one of the listed items of interest and any combination of any two or more.
Although terms such as "first," "second," and "third" may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first member, component, region, layer or section discussed in examples described herein could also be termed a second member, component, region, layer or section without departing from the teachings of the examples.
For ease of description, spatially relative terms such as "above … …," "upper," "below … …," and "lower" may be used herein to describe one element's relationship to another element as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "upper" relative to another element would then be oriented "below" or "lower" relative to the other element. Thus, the term "above … …" includes both orientations "above … …" and "below … …" depending on the spatial orientation of the device. The device may also be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. Singular forms also are intended to include plural forms unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" are intended to specify the presence of stated features, integers, operations, elements, and/or groups thereof, but do not preclude the presence or addition of one or more other features, integers, operations, elements, and/or groups thereof.
Variations from the shapes of the illustrations as a result, of manufacturing techniques and/or tolerances, are to be expected. Accordingly, the examples described herein are not limited to the particular shapes shown in the drawings, but include changes in shapes that occur during manufacture.
The features of the examples described herein may be combined in various ways that will be apparent after an understanding of the disclosure of the present application. Further, while the examples described herein have a variety of configurations, other configurations are possible as will be apparent after an understanding of the present disclosure.
According to a first aspect of the present invention, there is provided a battery cell including a housing 100, a terminal and a pressure relief portion 200.
Hereinafter, a specific structure of the above-described components of the battery cell according to the present embodiment will be described.
In this embodiment, as shown in fig. 1 and 2, the battery cell includes a housing 100, a terminal and a pressure relief portion 200; the casing 100 is provided with a plurality of bearing areas, the pole and the pressure relief portion 200 are disposed on the casing 100 through different bearing areas, that is, the bearing areas are the areas on the casing 100 for bearing the pole or disposing the pressure relief portion 200, wherein the bearing areas for bearing the pole are formed into a through hole structure.
In this embodiment, the pressure relief portion 200 is an explosion-proof scribe line, and when the pressure relief portion 200 is an explosion-proof scribe line, the bearing area corresponding to the pressure relief portion is an area for processing the scribe line on the housing 100. However, in another embodiment, the pressure relief portion is an explosion-proof valve, and the receiving area corresponding to the explosion-proof valve is formed in a through-hole-like structure.
In the present embodiment, the mechanical performance parameters of the housing 100 include: the tensile strength a of the shell 100 is expressed in Mpa, and the tensile strength of the shell 100 is a critical value of transition from uniform plastic deformation to local concentrated plastic deformation of the shell 100, and represents the maximum bearing capacity of the shell 100 under the static stretching condition; the yield strength b of the shell 100 is expressed in Mpa, and the yield strength of the shell 100 is the yield limit of the shell 100 when the yield phenomenon occurs, namely, the stress resisting micro plastic deformation; and the compressive strength c of the casing 100, the unit is Mpa, and the compressive strength of the casing 100 is the ultimate load that the casing 100 can withstand per unit area before breaking under a compression condition.
Further, in the present embodiment, the overall structural strength σ of the housing 100 is a×10 -2 +b×10 -2 。
In the present embodiment, the safety performance parameters of the housing 100 include: the shear strength tau of the shell 100 is expressed in Mpa, and the shear strength of the shell 100 is the ultimate strength generated when the material is sheared, and reflects the capability of the material for resisting shearing sliding; the opening pressure p of the pressure relief part 200 is expressed in Mpa; and the total area of all of the receiving areas is the ratio f of the surface area of the housing 100.
The total area of all the receiving areas is the sum of the areas of all the receiving areas for mounting the pole and the pressure relief portion 200. In addition, when the pressure relief portion 200 is an explosion-proof score line, the area of the bearing area for mounting the pressure relief portion 200 is the projected area of the pressure relief portion 200 on the plane where the bearing area is provided.
In this embodiment, to ensure that the battery cell has both structural strength and safety, the relationship between the overall structural strength σ of the housing 100 and the safety performance parameter of the housing 100 satisfies at least one of the following condition limitations:
condition 1:
condition 2:
condition 3:
thus, by controlling the tensile strength a, the yield strength b, the compressive strength c, the shear strength τ, the opening pressure p of the pressure relief portion 200, and the proportion f of the total area of all bearing areas to the surface area of the housing 100, the housing 100 is prevented from cracking during the operation of the battery cell, and the pressure relief portion 200 is ensured to be normally opened. The problem that the existing battery cell cannot give consideration to structural strength and safety performance is solved, so that the safe operation of the battery cell is ensured, and the occurrence rate of safety accidents is reduced.
In a preferred embodiment, the mechanical performance parameter of the casing 100 and the safety performance parameter of the casing 100 are defined in any one of the above three conditions, so that the ratio of the shearing strength of the casing 100, the opening pressure of the pressure relief portion 200 and the total area of all bearing areas to the surface area of the casing 100 is limited, so that the safety performance parameter of the casing 100 is respectively limited to the overall structural strength of the casing 100, thereby further improving the safety of the battery cell and ensuring the safe operation and reliability of the battery cell.
Further, in a preferred embodiment, the tensile strength a of the housing 100 is 315Mpa to 406Mpa; specifically, the tensile strength a of the housing 100 may be 315Mpa, 325Mpa, 335Mpa, 345Mpa, 355Mpa, 360Mpa, 365Mpa, 370Mpa, 375Mpa, 380Mpa, 385Mpa, 390Mpa, 395Mpa, 400Mpa or 406Mpa.
Further, in a preferred embodiment, the yield strength b of the shell 100 is 156Mpa to 286Mpa; specifically, the yield strength b of the shell 100 may be 156Mpa, 165Mpa, 175Mpa, 185Mpa, 195Mpa, 200Mpa, 205Mpa, 210Mpa, 215Mpa, 220Mpa, 225Mpa, 230Mpa, 235Mpa, 240Mpa, 245Mpa, 250Mpa, 255Mpa, 265Mpa, 275Mpa or 286Mpa.
Further, in a preferred embodiment, the compressive strength c of the housing 100 is 4.3Mpa to 8.5Mpa; specifically, the compressive strength c of the case 100 may be 4.3Mpa, 4.5Mpa, 5.0Mpa, 5.5Mpa, 6.0Mpa, 6.2Mpa, 6.4Mpa, 6.6Mpa, 6.8Mpa, 7.0Mpa, 7.5Mpa, 8.0Mpa, or 8.5Mpa.
Further, in a preferred embodiment, the shear strength τ of the shell 100 is 25Mpa to 50Mpa; specifically, the shear strength τ of the shell 100 may be 25Mpa, 28Mpa, 30Mpa, 32Mpa, 35Mpa, 38Mpa, 40Mpa, 42Mpa, 44Mpa, 46Mpa, 48Mpa, or 50Mpa.
Further, in a preferred embodiment, the opening pressure p of the pressure relief portion 200 is 1.2Mpa to 2.6Mpa; specifically, the opening pressure p of the pressure relief portion 200 may be 1.2Mpa, 1.4Mpa, 1.6Mpa, 1.8Mpa, 2.0Mpa, 2.2Mpa, 2.4Mpa, or 2.6Mpa.
Further, in a preferred embodiment, the total area of all of the receiving areas is 0.1% to 10% of the surface area f of the housing 100; specifically, the ratio f of the total area of all of the receiving areas to the surface area of the housing 100 may be 0.1%, 0.2%, 0.3%, 0.35%, 0.4%, 0.42%, 1%, 2%, 4%, 7%, 8%, or 10%.
The battery produces a certain amount of gas at the in-process of charging and discharging for the inside certain pressure that has of casing 100, under the condition that the electric core satisfies above-mentioned parameter range, the casing 100 of electric core has sufficient structural strength that resists deformation even breaks, and guarantees that pressure release portion 200 can normally open, so guarantees electric core safety in utilization, thereby makes electric core compromise structural strength and security, guarantees electric core safe operation.
The following formulas of the normal operation and the occurrence of thermal runaway of the battery cell (tensile strength a of the case 100, yield strength b of the case 100, and compressive strength c of the case 100) and safety performance parameters (shear strength τ of the case 100, opening pressure p of the pressure relief portion 200, and total area of the bearing area to the surface area f of the case 100) are respectively carried into the above-mentioned condition 1, condition 2, and condition 3 are calculated, compared, and analyzed, and experimental data are shown in the following table.
Note that: units of a, b, c, τ and p in the table are all Mpa; the values of result 1 in the table are calculated by the formulas that bring a, b, c and τ into condition 1 above; the values of result 2 are calculated by the formulas that bring a, b, c, and p into condition 2 above; the values of result 3 are calculated by the formulas that bring a, b, c, and f into condition 3 above.
In the table, the cells in examples 1 to 6 and comparative examples 1 to 3 are cylindrical cells with the same volume, and all the cells are tested under the same working condition, wherein the cells in examples 1 to 6 are in a normal operation state, the cells in comparative examples 1 to 3 are in thermal runaway, the characterization of the thermal runaway of the cells is shown in fig. 3 and 4, a large amount of gas is generated in the casing 100, and when the gas pressure in the casing 100 reaches the opening pressure p, the pressure relief part 200 is cracked, so that part of the cover plate is propped open by the gas, and the gas in the power supply core is discharged out of the casing 100.
Referring to examples 1 to 6 in the table, all parameters a are located between 315Mpa and 406Mpa, all parameters b are located between 156Mpa and 286Mpa, all parameters c are located between 4.3Mpa and 8.5Mpa, all parameters τ are located between 25Mpa and 50Mpa, all parameters p are located between 1.2Mpa and 2.6Mpa, and all parameters f are located between 0.1% and 10%, and the results 1, 2 and 3 obtained by bringing the parameters in examples 1 to 6 into the formulas in the conditions 1, 2 and 3 are located in the ranges defined by the conditions 1, 2 and 3, respectively, so that the limitation of the conditions 1, 2 and 3 can achieve the improvement of the safety of the battery cell and ensure the safe operation and reliability of the battery cell.
In contrast, in comparative example 1, since 200Mpa is less than 315Mpa, the value of parameter a is not within the preferred range of tensile strength of the housing 100, and as a result 1 is not satisfied with the definition of condition 1; in contrast, in comparative example 2, since 100Mpa is less than 156Mpa, the value of the parameter b is not within the preferred range of the yield strength of the housing 100, the result 2 is not satisfied with the definition of the condition 2 and the result 3 is not satisfied with the definition of the condition 3; in comparative example 3, however, since 3Mpa is less than 4.3Mpa, the value of the parameter c is not within the preferred range of the compressive strength of the housing 100, and as a result 2 is not satisfied with the definition of condition 2; therefore, when the mechanical performance parameter and the safety performance parameter of the casing 100 are not satisfied with the above conditions and the limitation of the preferred range, the thermal runaway condition of the battery cell is easy to occur, and it is further proved that the limitations of the condition 1, the condition 2 and the condition 3 can achieve the improvement of the safety of the battery cell, and the safe operation and reliability of the battery cell are ensured.
In this embodiment, the housing 100 is an aluminum or stainless steel material.
In this embodiment, as shown in fig. 1 and 2, the structure of the battery cell is cylindrical or square. The pressure relief portion 200 is provided with at least one, and the pressure relief portion 200 is provided on at least one end surface of the case 100, which may be a plane at an end in the cell length direction. When the pressure relief portion 200 is provided in plurality, the plurality of pressure relief portions 200 are provided on the same end face of the battery cell, or the plurality of battery cells are provided on both end faces of the case 100 opposite to each other. However, the number and the positions of the pressure release portions 200 are not limited thereto, and may be arranged according to the exhaust requirements of the battery cells.
Further, in this embodiment, as shown in fig. 1 and 2, the housing 100 includes a cover plate, the cover plate is located at least one end of the housing 100 in the axial direction, a portion of the housing 100 other than the cover plate (i.e., the main body of the housing 100) is formed into a structure having a cavity therein for accommodating the pole group of the battery cell, the cover plate is fastened to the main body of the housing 100 so that the housing 100 is formed into a closed structure, the cover plate can be detachably connected with the main body of the housing 100 so that the main body of the housing 100 and the cover plate are formed into a split structure, and the cover plate can also be welded with the main body of the housing 100 so that the main body of the housing 100 and the cover plate are formed into an integral structure. It should be noted that the pole group may be a coiled or laminated structure.
Still further, in this embodiment, the bearing area is disposed on the cover plate, that is, the pressure relief portion 200 and the pole are both mounted on the cover plate, the cover plate may be one, two or more, and when the number of the cover plates is at least two, the bearing area may be disposed on the same cover plate or on different cover plates. As shown in fig. 1 and 2, when the cover plates are provided with two, the two cover plates are respectively a positive cover plate 101 provided at the positive electrode of the battery cell and a negative cover plate 102 provided at the negative electrode of the battery cell, the positive cover plate 101 and the negative cover plate 102 are located at opposite ends of the casing 100 from each other, and when the battery cell is of a cylindrical structure, the positive cover plate 101 and the negative cover plate 102 may be formed into a circular plate-like structure and provided at both ends in the axial direction of the battery cell, respectively.
It should be noted that, when the number of the cover plates is at least two, the pressure relief portions 200 may be disposed in one-to-one correspondence with the cover plates, or a plurality of pressure relief portions 200 may be disposed on one cover plate, or only a portion of the cover plates may be disposed with pressure relief portions 200, and the number of the cover plates disposed with pressure relief portions 200 may be one.
Further, in the present embodiment, the electrode posts include a positive electrode post 110 and a negative electrode post 120; in one embodiment, as shown in fig. 1 and 2, the positive electrode tab 110 and the negative electrode tab 120 are disposed on both sides of the case 100, for example, the positive electrode tab 110 is disposed on the positive electrode cover plate 101, and the negative electrode tab 120 is disposed on the negative electrode cover plate 102. In another embodiment, the positive electrode post 110 and the negative electrode post 120 are disposed on the same side of the casing 100, that is, the positive electrode post 110 and the negative electrode post 120 protrude outwards on the same end surface of the casing 100, and in the case that the positive electrode post 110 and the negative electrode post 120 are disposed on the same side of the casing 100, the casing 100 may include only one cover plate, on which the positive electrode post 110 and the negative electrode post 120 are simultaneously disposed, and the positive electrode tab and the negative electrode tab of the corresponding electrode group are also disposed on the same side, so that the current flowing path can be greatly shortened, the internal resistance of the structure and the heat productivity of the system are reduced, and the space utilization of the battery structure can also be improved.
According to the battery cell provided by the invention, the ratio range between the structural strength of the battery cell shell and different safety performance parameters of the shell is limited, so that the battery cell shell has enough structural strength and can meet the safety performance requirement, the situation that the pressure release part cannot be normally opened due to shell rupture in the operation process of the battery cell is avoided, and the safe operation of the battery cell is ensured.
According to a second aspect of the present invention, there is provided a battery module comprising a plurality of cells as described above, the plurality of cells being connected together to increase the voltage or energy storage capacity of the battery system, the parallel and series connection of the cells enabling the battery module to meet the power requirements of different applications, in particular the plurality of cells being connected in series to increase the total voltage and the plurality of cells being connected in parallel to increase the total capacity. Therefore, the battery module can realize safe operation while meeting the requirements of electric vehicles, power hybrid vehicles, energy storage systems and other application conditions requiring large capacity and high voltage under the condition that each battery cell can ensure safe operation of the battery module.
According to the battery pack provided by the third aspect of the invention, the battery pack comprises the battery modules, a plurality of groups of battery modules are arranged in the battery pack, and the plurality of groups of battery modules can be connected in parallel or in series to increase the voltage, capacity or power of the battery system. Under the condition that each group of cell modules can realize safe operation, the battery pack can provide higher-level electric energy storage and management so as to meet different application requirements and realize safe operation.
Finally, it should be noted that: the foregoing examples are merely specific embodiments of the present application, and are not intended to limit the scope of the present application, but the present application is not limited thereto, and those skilled in the art will appreciate that while the foregoing examples are described in detail, the present application is not limited thereto. Any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or make equivalent substitutions for some of the technical features within the technical scope of the disclosure of the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. The battery cell is characterized by comprising a shell, a pole and a pressure relief part; the shell is provided with a plurality of bearing areas, and the polar post and the pressure relief part are arranged on the shell through different bearing areas;
the mechanical performance parameters of the shell comprise: the tensile strength a of the shell is expressed in Mpa; the yield strength b of the shell is expressed in Mpa; and the compressive strength c of the shell in Mpa;
the overall structural strength sigma of the shell is a multiplied by 10 -2 +b×10 -2 ；
The safety performance parameters of the shell comprise: the shear strength tau of the shell is expressed in Mpa;
sigma and tau satisfy the following relationship:
and/or, the safety performance parameters of the shell comprise: the opening pressure p of the pressure relief part is expressed in Mpa;
sigma and p satisfy the following relationship:
and/or, the safety performance parameters of the shell comprise: the total area of all the bearing areas accounts for the proportion f of the surface area of the shell;
sigma and f satisfy the following relationship:
2. the cell of claim 1, wherein the tensile strength a of the housing is 315Mpa to 406Mpa; the yield strength b of the shell is 156 Mpa-286 Mpa; the compressive strength c of the shell is 4.3 Mpa-8.5 Mpa.
3. The cell of claim 1, wherein the shear strength τ of the housing is between 25Mpa and 50Mpa.
4. The cell of claim 1, wherein the pressure relief portion has a cracking pressure p of 1.2Mpa to 2.6Mpa.
5. The cell of claim 1, wherein the total area of all of the receiving areas is 0.1% to 10% of the surface area f of the housing.
6. The cell of claim 1, wherein the pressure relief portion is at least one; the pressure relief portion is disposed on at least one end face of the housing.
7. The cell of claim 1, wherein the housing comprises a cover plate, the receiving area is disposed on the cover plate, and the cover plate is located at least one end of the housing;
the body of the housing and the cover plate are formed in a split structure, or the body of the housing and the cover plate are formed in an integrated structure.
8. The cell of claim 1, wherein the terminal comprises a positive terminal and a negative terminal;
the positive pole and the negative pole are arranged on two sides of the shell, or the positive pole and the negative pole are arranged on the same side of the shell.
9. A battery module characterized in that the battery module comprises the cell as claimed in any one of claims 1 to 8.
10. A battery pack, characterized in that the battery pack comprises the battery module according to claim 9.
CN202311378547.0A 2023-10-23 2023-10-23 Battery cell, battery module and battery pack Pending CN117352926A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117996309A (en) * 2024-03-29 2024-05-07 蜂巢能源科技股份有限公司 Battery cover plate assembly, battery and power device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117996309A (en) * 2024-03-29 2024-05-07 蜂巢能源科技股份有限公司 Battery cover plate assembly, battery and power device

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