CN118738755B - Battery cell cover plate and battery cell - Google Patents
Battery cell cover plate and battery cell Download PDFInfo
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- CN118738755B CN118738755B CN202411230825.2A CN202411230825A CN118738755B CN 118738755 B CN118738755 B CN 118738755B CN 202411230825 A CN202411230825 A CN 202411230825A CN 118738755 B CN118738755 B CN 118738755B
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- piece
- battery cell
- cover plate
- pressure release
- support
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- 230000008093 supporting effect Effects 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims description 12
- 238000009434 installation Methods 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910000967 As alloy Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000013022 venting 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
- 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
- H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The invention relates to the technical field of batteries, in particular to a battery cell cover plate and a battery cell. The battery cell cover plate comprises a cover plate main body, a pressure release piece, a support piece and a battery cell, wherein the cover plate main body is provided with a mounting hole, a first mounting part and a second mounting part are formed in the mounting hole, the pressure release piece is arranged on the first mounting part, the support piece is arranged on the second mounting part, the pressure release piece is abutted to the support piece, the support piece provides a supporting force F for the pressure release piece, the unit is N, the weight of the battery cell is G, the unit is N, and the G/F is less than or equal to 0.12. According to the invention, the mounting hole on the cover plate main body is divided into the first mounting part and the second mounting part, the first mounting part is used for mounting the pressure release piece, the second mounting part is used for mounting the support piece, the support piece is arranged to effectively improve the structural strength of the area of the cover plate main body where the pressure release piece is mounted, and the pressure release piece is abutted with the support piece, so that the support piece can also serve as a support platform of the pressure release piece, the reliability and firmness in mounting the pressure release piece are ensured, and the safety of the battery cell is improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery cell cover plate and a battery cell.
Background
With the increasing maturity of lithium ion battery technology, the lithium ion battery is widely applied to the electric automobile and the energy storage field as a power battery, and the requirements on the usability and the safety of the lithium ion battery are increasing.
The lithium battery cover plate is a key accessory in the lithium ion battery and has the functions of being welded with the shell to form a sealed cavity, leading out positive and negative electrodes of the electrode group, being used as an assembly carrier and the like. The traditional cover plate comprises a riveting block, an upper plastic, a polar column, a top cover plate, a lower plastic, a sealing ring, an explosion-proof valve and other structures, wherein a sinking table structure for assembling the explosion-proof valve is arranged on the top cover plate, so that the top cover plate is in welded connection with the explosion-proof valve. Because the cover plate is required to reserve an installation space for the explosion-proof valve, especially the length-width ratio of the cover plate of the blade battery or the square battery is larger, the area on the cover plate where the explosion-proof valve is arranged is weaker, when the battery is impacted or falls, the area on the cover plate where the explosion-proof valve is easy to bend and deform, and the explosion-proof valve is caused to crack, so that the safety risks of battery leakage, fire and the like are increased.
Disclosure of Invention
Therefore, the application aims to provide a battery cell cover plate and a battery cell, which are used for solving the problems that the structure of the area where the explosion-proof valve is arranged on the existing cover plate is weak, the cover plate is easy to bend and deform at the position where the explosion-proof valve is arranged when the battery cell is impacted, the explosion-proof valve is cracked, and the safety risks such as leakage and fire of the battery cell are increased.
The first aspect of the invention provides a battery cell cover plate, wherein the battery cell cover plate comprises:
The cover plate main body is provided with a mounting hole, and the mounting hole is provided with a first mounting part and a second mounting part;
A pressure release member provided to the first mounting portion;
the support piece is arranged on the second installation part, the pressure release piece is abutted to the support piece, the support force provided by the support piece for the pressure release piece is F, and the weight of the battery cell is G, and G/F is less than or equal to 0.12.
Preferably, the support member is connected with the second mounting portion in an interference fit manner, and the interference between the support member and the second mounting portion is 0.03mm to 0.08mm.
Preferably, the pressure release piece with first installation department welded connection, before the welding the pressure release piece with first installation department clearance fit, the fit clearance between pressure release piece and the first installation department is 0.04mm to 0.1mm.
Preferably, a boss portion protruding toward the support member is formed at a side portion of the pressure relief member, the boss portion having a width dimension n in the second direction;
The pressure relief piece is formed with a recessed score portion, and a distance between the score portion and an edge of the pressure relief piece in a second direction is k.
Preferably, the support is formed in a ring-shaped structure, the distance between the inner ring and the outer ring of the support being s, n < s < k.
Preferably, the mechanical structural strength of the support is greater than the mechanical structural strength of the cover body.
Preferably, the thickness dimension of the cover plate main body in the first direction is M, the thickness dimension of the support member in the first direction is t, and the maximum thickness dimension of the pressure release member in the first direction is M, m=t+m.
Preferably, along the axial direction of the mounting hole, the first mounting portion is disposed on a side of the cover main body facing the inside of the battery cell, and the second mounting portion is disposed on a side of the cover main body facing the outside of the battery cell.
Preferably, the cell cover plate further comprises:
the protecting piece is arranged on one side of the supporting piece, which is opposite to the pressure relief piece.
The second aspect of the invention provides a battery cell, which comprises the battery cell cover plate according to any one of the above technical schemes.
Compared with the prior art, the invention has the beneficial effects that:
According to the battery cell cover plate, the mounting hole is formed in the cover plate main body and is divided into the first mounting part and the second mounting part, the first mounting part is used for mounting the pressure release piece, the second mounting part is used for mounting the supporting piece, the supporting piece is arranged to effectively improve the structural strength of the area of the cover plate main body where the pressure release piece is mounted, the pressure release piece is abutted to the supporting piece, the supporting piece can also serve as a supporting platform of the pressure release piece, in addition, the ratio relation between the supporting force F provided by the supporting piece for the pressure release piece and the weight G of the battery cell is G/F which is smaller than or equal to 0.12, the supporting reliability of the supporting piece on the pressure release piece is further guaranteed, the reliable and firm mounting of the pressure release piece is guaranteed, and the safety of the battery cell is improved.
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 structural exploded view of a battery cell cover plate according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a battery cell cover plate according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is an enlarged schematic view of the structure of FIG. 3 at P;
fig. 5 is a schematic structural diagram of a support member in a battery cell cover plate according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a support member in a cell cover plate under another application according to an embodiment of the present invention;
FIG. 7 is a cross-sectional view taken along B-B in FIG. 6;
fig. 8 is a schematic structural diagram of a cover main body in a battery cell cover according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a pressure release member in a battery cell cover plate according to an embodiment of the present invention;
fig. 10 is a sectional view taken along line C-C of fig. 9.
The icons are 10-cover plate body, 11-mounting hole, 111-first mounting part, 112-second mounting part, 20-pressure relief part, 21-boss part, 22-notch part, 30-support part, 40-protection part, 50-pole, 60-sealing part, 71-first insulating part, 72-second insulating part, 80-riveting part, D1-first direction and D2-second direction.
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 understanding the present disclosure.
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, spatial relationship 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 "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 upon an understanding of the present disclosure. 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 cell cover, which specifically includes a cover body 10, a pressure relief piece 20, and a support 30.
Hereinafter, a specific structure of the battery cell cover plate according to the present embodiment as described above will be described.
In the present embodiment, as shown in fig. 1 to 3, the cover main body 10 is formed in a plate-like structure, the cover main body 10 may be made of aluminum material, the cover main body 10 may be formed in a rectangular or circular shape, etc., the cover main body 10 is provided with mounting holes 11, and the mounting holes 11 are formed in a through-hole structure penetrating the cover main body 10 in the first direction D1.
Specifically, as shown in fig. 4 and 8, the mounting hole 11 is formed with a first mounting portion 111 and a second mounting portion 112, the first mounting portion 111 and the second mounting portion 112 are arranged along the axis of the mounting hole 11, the pressure release member 20 is arranged on the first mounting portion 111, the support member 30 is arranged on the second mounting portion 112, the support member 30 can play a role in supporting the cover plate main body 10 to strengthen the structure, so that the structural strength of the area where the cover plate main body 10 is provided with the pressure release member 20 can be effectively improved, the pressure release member 20 is abutted to the support member 30, the support member 30 can also serve as a supporting platform of the pressure release member 20, the reliability and firmness in installation of the pressure release member 20 are ensured, and the safety of the battery cell is improved.
Preferably, in the present embodiment, as shown in fig. 3 and 4, the first mounting portion 111 is disposed on the side of the cap body 10 facing the inside of the battery cell in the axial direction of the mounting hole 11, and the second mounting portion 112 is disposed on the side of the cap body 10 facing the outside of the battery cell, such that the support member 30 is mounted on the side of the cap body 10 facing the outside of the battery cell, and the pressure release member 20 is mounted on the side of the cap body 10 facing the inside of the battery cell, thereby protecting the pressure release member 20.
Further, in the present embodiment, the supporting member 30 is connected with the second mounting portion 112 in an interference fit manner, so that the structural strength of the area of the cover main body 10 where the pressure relief piece 20 is mounted can be effectively improved by the supporting member 30, preferably, the interference between the supporting member 30 and the second mounting portion 112 is 0.03mm to 0.08mm, so that the connection strength between the supporting member 30 and the cover main body 10 is ensured, and the assembly difficulty is reduced.
Preferably, the mechanical structural strength of the support 30 is greater than that of the cap body 10, which is the maximum load that the material can withstand per unit area when it is subjected to an external force, including bending strength, tensile strength, compressive strength, and impact strength. The material of the support member 30 may be a material having mechanical properties higher than those of the cover main body 10, such as alloy steel and carbon steel. In an alternative embodiment, the material of the support member 30 is 45 steel, and the material of the cover main body 10 is aluminum, so as to ensure that the mechanical structural strength of the support member 30 is far greater than that of the cover main body 10.
Preferably, the support 30 provides a supporting force F, f=p×s, where P is the material yield strength of the support 30 in Mpa, S is the area of the cross section of the support 30 perpendicular to its axis, i.e. S is the cross sectional area of the support 30. The weight of the battery cell is G, and G/F is less than or equal to 0.12, so that the support piece 30 can effectively and reliably support the pressure release piece 20.
Further, in the present embodiment, as shown in fig. 3 and 4, the pressure release member 20 is welded to the first mounting portion 111, and the pressure release member 20 is in clearance fit with the first mounting portion 111 before welding, so that the welding strength of the pressure release member 20 and the cover main body 10 is ensured to be reliable, and preferably, the fit clearance between the pressure release member 20 and the first mounting portion 111 is 0.04mm to 0.1mm.
In the present embodiment, as shown in fig. 4, 9 and 10, the pressure relief member 20 is formed in a sheet-like structure, the side portion of the pressure relief member 20 is formed with the boss portion 21 protruding toward the support member 30, and the boss portion 21 may be formed in a ring-like structure, so that the size of the welding area of the pressure relief member 20 and the first mounting portion 111 in the first direction D1 is increased to ensure the welding strength of the pressure relief member 20 and the first mounting portion 111. The boss portion 21 is abutted against the supporting member 30, the width dimension of the boss portion 21 in the second direction D2 is n, the unit is mm, so that the supporting member 30 can form effective supporting for the pressure release member 20, a concave notch portion 22 is formed on the surface of one side of the pressure release member 20 facing the outside of the battery cell, the notch portion 22 can be formed into an annular structure with an opening, when the pressure release member 20 is opened, the inner area of the annular structure is only in an opening state and cannot fall off completely, the condition that short circuit is caused by metal lap joint is avoided, the thickness of the local position of the pressure release member 20 in the first direction D1 is reduced by the notch portion 22, when the battery cell fails to generate gas in the battery cell, the pressure in the battery cell enables the pressure release member 20 to crack along the shape of the notch portion 22, the distance between the notch portion 22 and the edge of the pressure release member 20 in the second direction D2 is k, and the unit is mm, and n < k.
In the present embodiment, as shown in fig. 5 to 7, the support 30 is formed in a ring-shaped structure, so that the gas inside the battery cell can be discharged from the ring of the support 30 when the venting member 20 is opened. Preferably, the support member 30 is formed in a ring-shaped structure in which the distances between the inner ring and the outer ring are equal throughout the circumference, that is, the entire circumferential width dimension of the support member 30 is equal, the distance between the inner ring and the outer ring of the support member 30 is s in mm, n < s < k, such that the inner ring of the support member 30 protrudes from the inner wall of the boss portion 21 in the second direction D2, thus ensuring that the support member 30 performs an effective and reliable supporting action on the cap plate body 10 and the pressure release member 20.
In a preferred embodiment, as shown in fig. 7, 8 and 10, the thickness dimension of the cover main body 10 in the first direction D1 is M, the unit is mm, the thickness dimension of the support member 30 in the first direction D1 is t, the unit is mm, the maximum thickness dimension of the pressure release member 20 in the first direction D1 is M (i.e., the thickness dimension of the boss portion 21 in the first direction D1 is M as described above), and the unit is mm, m=t+m, so that the support member 30 can fill the positions of the mounting hole 11 except for the pressure release member 20, thereby ensuring that the support member 30 can reliably support the cover main body 10, ensuring that the mechanical structural strength of the area of the cover main body 10 where the pressure release member 20 is arranged is effectively improved, avoiding the situation that the pressure release member 20 is cracked due to bending deformation under the impact effect of the area of the cover main body 10 where the pressure release member 20 is arranged, and reducing the safety of cell leakage, fire and the like.
In this embodiment, the first direction D1 is perpendicular to the second direction D2, the first direction D1 may be a thickness direction of the battery cell cover, and the second direction D2 may be a length direction of the cover body 10 when the cover body 10 is formed in a rectangular structure.
In this embodiment, as shown in fig. 1 to 4, the cell cover plate further includes a protecting member 40, where the protecting member 40 may be formed into a sheet structure, and the protecting member 40 is disposed on a side of the supporting member 30 opposite to the pressure release member 20, so as to avoid damage to the pressure release member 20 caused by components outside the cell, which results in early opening of the pressure release member 20. Preferably, an opening is formed between the protection member 40 and the support member 30 to ensure that the gas inside the battery cell can be discharged in time when the pressure release member 20 is opened.
In addition, in the present embodiment, as shown in fig. 1 to 3, the battery cell cover further includes a post 50, a sealing member 60, a first insulating member 71, a second insulating member 72, and a rivet 80, wherein the post 50 passes through a through hole on the cover body 10 and is connected with a tab on a pole group inside the battery cell.
The first insulating member 71 and the second insulating member 72 may both be made of plastic materials to play a role in insulation protection, where the first insulating member 71 is enclosed on a circumferential sidewall of the pole 50 and disposed on a side of the cover body 10 facing the outside of the battery cell, and the second insulating member 72 is disposed on a side of the cover body 10 facing the inside of the battery cell, so as to separate the cover body 10 and the pole 50, and avoid a short circuit.
The riveting member 80 is in riveting connection with the pole 50, so that positioning of the pole 50 and the cover plate main body 10 is achieved, and part of the first insulating member 71 is arranged on the circumferential side wall of the riveting member 80 in a surrounding mode, so that insulating protection effect is also achieved on the riveting member 80. The rivet 80 may be formed in a block structure having a stepped hole.
The sealing piece 60 is embedded between the first insulating piece 71 and the bottom plate of the pole 50 in the first direction D1, and embedded between the cover plate main body 10 and the side wall of the pole 50 in the second direction D2, so that the assembly tightness of the pole 50 and the cover plate main body 10 is ensured, the situation of leakage and the like of the battery core is avoided, and the safety of the battery core is ensured. The seal 60 may be a seal ring having elasticity.
The following tests were performed on cell drop tests for different sizes of cell cover plates to verify whether the support member 30 can reliably support the pressure relief member 20, wherein the cover plate main body 10 is made of aluminum, and the specific tests are shown in the following table.
Test one, the weight g=60deg.N of the battery cell, the thickness dimension t=1.5 mm of the support member 30 in the first direction, the thickness dimension m=2 mm of the cover plate main body 10 in the first direction D1, the distance k=1.3 mm between the notched portion 22 and the edge of the pressure release member 20 in the second direction D2, the material of the support member 30 was steel No. 45, the yield strength p=355 Mpa, the cross-sectional area S of the support member 30 was changed by adjusting the distance S between the inner ring and the outer ring of the support member 30 to perform a plurality of groups of tests, the supporting force f=p×s, and the test results are shown in Table 1.
TABLE 1
Test two, the weight g=95n of the battery cell, the thickness dimension t=2 mm of the support member 30 in the first direction, the thickness dimension m=2.5 mm of the cover plate main body 10 in the first direction D1, the distance k=1.5 mm between the notch 22 and the edge of the pressure release member 20 in the second direction D2, the material of the support member 30 was steel No. 45, the yield strength p=355 Mpa, the cross-sectional area S of the support member was changed by adjusting the distance S between the inner ring and the outer ring of the support member 30 to perform a plurality of groups of tests, the supporting force f=p×s, and the test results are shown in table 2.
TABLE 2
Test three the weight g=80n of the cell, the thickness dimension t=2mm of the support 30 in the first direction, the thickness dimension m=2.5mm of the cover body 10 in the first direction D1, the distance k=2mm between the score 22 and the edge of the pressure release member 20 in the second direction D2, the material of the support 30 was Q235 steel, the yield strength p=235 Mp, and the cross-sectional area S of the support was changed by adjusting the distance S between the inner ring and the outer ring of the support 30 to perform a plurality of tests, the support force f=p×s, and the test results are shown in table 3.
TABLE 3 Table 3
Referring to tables 1 to 3, in examples 1 to 3 to 1 to 10, examples 2 to 3 to 2 to 10 and examples 3 to 10, the pressure release member 20 under the drop test is free from abnormal conditions, mainly because the support member 30 can give the pressure release member 20 sufficient support, and according to test one to test three, the problem that the pressure release member 20 deforms or even cracks when the battery cell is impacted can be avoided under the condition that the weight G of the battery cell and the supporting force provided by the support member 30 to the pressure release member 20 satisfy G/F less than or equal to 0.12, thereby ensuring the use safety of the battery cell.
According to the battery cell cover plate provided by the invention, the mounting hole is formed in the cover plate main body and is divided into the first mounting part and the second mounting part, the first mounting part is used for mounting the pressure release piece, the second mounting part is used for mounting the support piece, the support piece is arranged to effectively improve the structural strength of the area of the cover plate main body where the pressure release piece is mounted, the pressure release piece is abutted with the support piece, the support piece can also serve as a support platform of the pressure release piece, in addition, the relation of the ratio of the supporting force F provided by the support piece for the pressure release piece to the weight G of the battery cell is G/F less than or equal to 0.12, the reliability of the support piece on the pressure release piece is further ensured, and therefore, the reliability and firmness of the mounting of the pressure release piece are ensured, and the safety of the battery cell is improved.
According to the battery cell, the battery cell cover plate is included, the structural strength of the battery cell cover plate is effectively improved under the action of the supporting piece, the situation that the pressure release piece is cracked under the impact of external force is avoided, and the use safety of the battery cell is ensured.
It should be noted that the foregoing embodiments are merely illustrative embodiments of the present application, and not restrictive, and the scope of the application is not limited to the embodiments, and although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that any modification, variation or substitution of some of the technical features of the embodiments described in the foregoing embodiments may be easily contemplated within the scope of the present application, and the spirit and scope of the technical solutions of the embodiments do not depart from the spirit and scope of the embodiments of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. A cell cover plate, characterized in that the cell cover plate comprises:
the battery cell comprises a cover plate main body, a battery cell and a battery cell, wherein the cover plate main body is provided with a mounting hole, the mounting hole is provided with a first mounting part and a second mounting part, the first mounting part is arranged on one side of the cover plate main body facing the inside of the battery cell along the axial direction of the mounting hole, and the second mounting part is arranged on one side of the cover plate main body facing the outside of the battery cell;
A pressure release member provided to the first mounting portion;
The support piece is arranged on the second installation part, the support piece is in an annular structure and is in interference fit connection with the second installation part, the mechanical structural strength of the support piece is larger than that of the cover plate main body, the pressure release piece is abutted against the support piece, the support piece provides supporting force for the pressure release piece, the unit is N, F=P×S, wherein P is the material yield strength of the support piece, the unit is Mpa, S is the cross section area of the support piece, the weight of the battery cell is G, and the unit is N, G/F is less than or equal to 0.12.
2. The cell cover of claim 1, wherein the interference between the support and the second mounting portion is 0.03mm to 0.08mm.
3. The cell cover plate of claim 1, wherein the pressure relief piece is welded to the first mounting portion, the pressure relief piece is in clearance fit with the first mounting portion prior to welding, and a fit clearance between the pressure relief piece and the first mounting portion is 0.04mm to 0.1mm.
4. The cell cover plate according to claim 1, wherein a side portion of the pressure relief piece is formed with a boss portion protruding toward the support piece, the boss portion having a width dimension n in the second direction;
The pressure relief piece is formed with a recessed score portion, and a distance between the score portion and an edge of the pressure relief piece in a second direction is k.
5. The cell cover of claim 4, wherein the distance between the inner and outer rings of the support is s, n < s < k.
6. The cell cover of claim 1, wherein the cover body has a thickness dimension M in a first direction, the support has a thickness dimension t in the first direction, and the pressure relief has a maximum thickness dimension M in the first direction, M = t + M.
7. The cell cover of claim 1, the battery cell cover plate is characterized by further comprising:
the protecting piece is arranged on one side of the supporting piece, which is opposite to the pressure relief piece.
8. A battery cell comprising a battery cell cover according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202411230825.2A CN118738755B (en) | 2024-09-04 | 2024-09-04 | Battery cell cover plate and battery cell |
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| CN202411230825.2A CN118738755B (en) | 2024-09-04 | 2024-09-04 | Battery cell cover plate and battery cell |
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| CN118738755A CN118738755A (en) | 2024-10-01 |
| CN118738755B true CN118738755B (en) | 2024-12-03 |
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| CN202411230825.2A Active CN118738755B (en) | 2024-09-04 | 2024-09-04 | Battery cell cover plate and battery cell |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209071396U (en) * | 2018-12-26 | 2019-07-05 | 蜂巢能源科技有限公司 | Battery core cover board and vehicle |
| CN118263587A (en) * | 2024-05-31 | 2024-06-28 | 蜂巢能源科技股份有限公司 | Battery cell cover plate and battery cell |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112234309A (en) * | 2020-11-19 | 2021-01-15 | 常州瑞德丰精密技术有限公司 | Secondary cell top cap subassembly and secondary cell |
| EP4290660A4 (en) * | 2021-12-16 | 2025-01-29 | Contemporary Amperex Technology (Hong Kong) Limited | BATTERY CELL, BATTERY, ELECTRICAL DEVICE, MANUFACTURING METHOD AND MANUFACTURING DEVICE |
| CN218867324U (en) * | 2022-10-31 | 2023-04-14 | 浙江伏打科技有限公司 | Explosion-proof pressure release valve for square aluminum shell lithium battery |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209071396U (en) * | 2018-12-26 | 2019-07-05 | 蜂巢能源科技有限公司 | Battery core cover board and vehicle |
| CN118263587A (en) * | 2024-05-31 | 2024-06-28 | 蜂巢能源科技股份有限公司 | Battery cell cover plate and battery cell |
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| CN118738755A (en) | 2024-10-01 |
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