CN118899602B - Battery and battery pack - Google Patents
Battery and battery pack Download PDFInfo
- Publication number
- CN118899602B CN118899602B CN202411398934.5A CN202411398934A CN118899602B CN 118899602 B CN118899602 B CN 118899602B CN 202411398934 A CN202411398934 A CN 202411398934A CN 118899602 B CN118899602 B CN 118899602B
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- Prior art keywords
- cover plate
- shell
- chamfer
- housing
- battery
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- 239000000463 material Substances 0.000 claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 10
- 230000007423 decrease Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 13
- 238000003466 welding Methods 0.000 description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 10
- 229910052759 nickel Inorganic materials 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000007773 negative electrode material Substances 0.000 description 4
- 239000007774 positive electrode material Substances 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000008719 thickening Effects 0.000 description 3
- 239000010936 titanium Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 244000137852 Petrea volubilis Species 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical compound [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004164 analytical calibration Methods 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- DVATZODUVBMYHN-UHFFFAOYSA-K lithium;iron(2+);manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[Fe+2].[O-]P([O-])([O-])=O DVATZODUVBMYHN-UHFFFAOYSA-K 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002210 silicon-based material Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 238000004804 winding 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
-
- 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)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention relates to the technical field of batteries and discloses a battery and a battery pack, wherein the battery comprises a shell, at least one end of the shell is provided with an opening, a cover plate is buckled on the opening of the shell, the edge of the cover plate, which faces the inner side of the shell, is provided with a chamfer, so that the dimension of the lower side of the cover plate along the direction close to the shell is reduced, the chamfer is at least partially embedded into the shell, the height of the chamfer along the thickness direction of the cover plate is a1, the thickness of the cover plate is a2, the ratio of a1 to a2 is a, the Vickers hardness of the shell is b, the unit of the Vickers hardness of the shell is hv, and the ratio of the a/b is more than or equal to 0.0005 and less than or equal to 0.014.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery and a battery pack.
Background
The battery generally comprises a shell and a cover plate, after the battery internal cell is installed, the cover plate needs to be buckled on the shell, and then laser is injected into a joint between the cover plate and the shell to realize the welding of the cover plate and the shell.
In the prior art, in order to avoid leaving the gap between apron and the casing, lead to laser to penetrate into the inside damage of casing from gap department in the laser welding process, generally adopt interference fit between apron and the casing to make between apron and the casing in close contact.
However, in the above prior art, since the cover plate and the housing are in interference fit, they are affected by different kinds of battery housing materials, when the vickers hardness of the housing is high, the cover plate is difficult to open the housing and to be buckled with the housing, so that the battery housing and the cover plate are difficult to be assembled, or the cover plate and the housing are excessively deformed to generate gaps, and the battery cells are damaged in the subsequent welding process.
Disclosure of Invention
In view of the above, the present invention provides a battery and a battery pack to solve the problem that the housing and the cover plate are difficult to assemble, or the cover plate or the housing is excessively deformed to generate a gap during the assembly process.
The invention provides a battery, which comprises a shell, a cover plate and a cover plate, wherein at least one end of the shell is provided with an opening, the cover plate is buckled with the opening of the shell, the edge of the cover plate, which faces the inner side of the shell, is provided with a chamfer, so that the dimension of one side of the cover plate, which is close to the shell, is reduced along the direction, which is close to the shell, the chamfer is at least partially embedded into the shell, the height of the chamfer along the thickness direction of the cover plate is a1, the thickness of the cover plate is a2, the ratio of a1 to a2 is a, the Vickers hardness of the shell is b, the unit of the Vickers hardness is hv, and a/b is more than or equal to 0.0005 and less than or equal to 0.014.
The cover plate has the beneficial effects that the opening on the shell is suitable for being assembled with the cover plate, and the cover plate is provided with the chamfer angle, so that the side wall of the shell is uniformly unfolded when the cover plate is buckled into the shell. Through the relation of comprehensive control chamfer height and casing vickers hardness to make the apron go into the shell smoothly, the bigger casing vickers hardness is, and the apron struts the degree of difficulty of casing and increases, through increasing chamfer height, chamfer part goes into the shell smoothly, and then realizes that the apron goes into the shell, simultaneously because the apron thickness is certain, and the apron is little except that chamfer part thickness, when apron and casing welding, is easy to weld the surplus part and is worn, causes apron and casing connection inefficacy. Therefore, in the present embodiment, the numerical relationship between the ratio a between the chamfer height and the cover plate height and the vickers hardness b of the shell is controlled, so that the cover plate shell can be further facilitated to open the side wall of the shell, and the cover plate can be smoothly put into the shell.
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 view showing the overall structure of a battery according to an embodiment of the present invention;
fig. 2 is a schematic view of a battery case structure according to an embodiment of the present invention;
fig. 3 is a schematic cross-sectional view showing the structure and positional relationship between a cover plate and a housing of a battery according to an embodiment of the present invention;
FIG. 4 is an enlarged schematic view of a portion A of FIG. 3;
Fig. 5 is a schematic cross-sectional view showing a relationship between a cover plate and a housing structure and a position of a battery according to an embodiment of the present invention;
FIG. 6 is a partially enlarged schematic illustration of portion B of FIG. 5;
fig. 7 is a schematic view of an overall structure of a battery for embodying a prismatic case according to an embodiment of the present invention;
fig. 8 is a schematic cross-sectional view showing a positional relationship between a cover plate having a prismatic shape and a case structure of a battery according to an embodiment of the present invention.
Reference numerals illustrate:
100. The device comprises a shell, 101, an opening, 102, a step hole, 200, a cover plate, 201 and a chamfer.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiments of the present invention are described below with reference to fig. 1 to 8.
According to an embodiment of the present invention, referring to fig. 1 to 4, there is provided a battery, including a case 100, at least one end of the case 100 has an opening 101, a cover 200 fastened to the opening 101 of the case 100, a chamfer 201 is provided at an edge of the cover 200 facing the inner side of the case 100, the chamfer 201 is at least partially embedded into the case 100, a height of the chamfer 201 along a thickness direction of the cover 200 is a1, a thickness of the cover 200 is a2, a ratio of a1 to a2 is a, a vickers hardness of the case 100 is b, and a/b is 0.0005-0.014.
In this embodiment, the opening 101 on the housing 100 is suitable for being assembled with the cover plate 200, the cover plate 200 seals the opening 101 of the housing 100, and a receiving space for placing the battery is formed between the cover plate 200 and the housing 100, in addition, in some embodiments, the cover plate 200 may provide a structural basis for structures such as a pole group assembly, a pressure release mechanism, a liquid injection hole, and the like. The material of the housing 100 may be steel, aluminum or other metal materials, and the material of the cover 200 and the material of the housing 100 may be the same or different. By providing chamfer 201 at cover 200, the side walls of housing 100 are uniformly stretched when cover 200 is snapped into housing 100. Through comprehensively controlling the relation between the height of the chamfer 201 and the Vickers hardness of the shell 100, the cover plate 200 is smoothly put into the shell, the greater the Vickers hardness of the shell 100 is, the more difficult the cover plate 200 is to prop open the shell 100, the chamfer 201 is smoothly put into the shell by increasing the height of the chamfer 201, so that the cover plate 200 is put into the shell, meanwhile, the thickness of the cover plate 200 is fixed, the thickness of the rest part of the cover plate 200 except the chamfer 201 is small, when the cover plate 200 and the shell 100 are welded, the rest part is easy to be welded through, the welding penetration width is easy to be caused to be insufficient, and the connection failure of the cover plate 200 and the shell 100 is caused. Therefore, in the present embodiment, by controlling the numerical relationship between the ratio a between the height of the chamfer 201 and the height of the cover plate 200 and the vickers hardness b of the housing 100, the cover plate 200 is further facilitated to open the side wall of the housing 100, so that the cover plate 200 is smoothly inserted into the housing, and meanwhile, the connection reliability of the cover plate 200 and the housing 100 is ensured.
In the above-described embodiment, it is to be noted that "the dimension of the side of the cover plate 200 close to the case 100 is reduced in the direction close to the case 100" means specifically that the dimension of the chamfer 201 in the length direction of the cover plate 200 is smaller than the dimension of the remaining portion in the thickness direction. In the above embodiment, the chamfer 201 may be a linear chamfer 201 or a nonlinear chamfer 201.
Specifically, in the above-described embodiments, the value of a/b may be 0.0005, 0.0008, 0.001, 0.005, 0.011, 0.014, or the like.
Specifically, the above embodiment does not limit the angle between the chamfer 201 and the peripheral side wall of the cover plate 200, and the chamfer 201 may be a linear chamfer 201, specifically, the chamfer 201 is an inclined plane, so that the length of the cover plate 200 corresponding to the chamfer 201 gradually decreases along the thickness direction of the cover plate 200, so that the cover plate 200 may be put into the shell, the angle between the chamfer 201 and the peripheral side wall of the cover plate 200 may be 45 °, the angle between the chamfer 201 and the peripheral side wall of the cover plate 200 may be other angles, such as 60 ° or 80 °, and in some embodiments not shown, the chamfer 201 may be nonlinear, such as an arc chamfer 201.
In addition, in particular, the specific shape of the housing 100 is not limited in the above embodiments, and the housing 100 may be, for example, cylindrical, and the end of the housing 100 may be a position corresponding to a cylindrical end surface, and in some embodiments not shown, the housing 100 may be other shapes, for example, the housing 100 may have a quadrangular prism shape or a hexagonal prism shape, so long as the opening 101 can be provided at the end of the housing 100 and the cover 200 can be interference fit with the opening 101 of the housing 100.
In the above embodiment, the material of the housing 100 may be steel or other materials including steel.
In the above embodiment, it should be additionally noted that the method for measuring vickers hardness can refer to the method for detecting vickers hardness specified in the national standard GB/T4340, and includes the following steps:
1. Preparation of the sample:
① And the sample is prepared by a plate cutting machine or a punch as much as possible, so that the sample is smooth and has no deformation and bending, and the surface of ② samples is polished to be smooth by using fine sponge sand paper or fine sand paper.
2. The detection process comprises the following steps:
① The instrument calibration was performed with 500g and the test was started.
② And (3) installing the sample on a clamp to ensure the level and stability of the material, placing the sample on an objective table, aligning an objective lens, and rotating a focusing hand wheel to obtain a clear image.
③ Three sets of data were tested and averaged as test results.
3. Data accuracy judgment basis:
① After focusing, the surface lines and edges and corners can be clearly seen.
② The detection lines with diagonal lengths are tangent to the four edges;
③ The difference (d 1-d 2) between the diagonal detection lengths is smaller than the longest diagonal d1.
In one embodiment, referring to FIGS. 1-4, a satisfies 0.1.ltoreq.a.ltoreq.0.8, and b ranges from 50hv to 300hv.
Specifically, the value of a may be 0.1, 0.15, 0.27, 0.5, 0.7 or 0.8, and the value of b may be 50hv, 60hv, 80hv, 150hv, 175hv, 223hv or 300hv.
In this embodiment, the height of the chamfer 201 and the thickness of the cover plate 200 are further controlled within the range of 0.1-0.8, so that the cover plate 200 can more smoothly prop open the opening 101 of the housing 100, and the cover plate 200 can be put into the housing. Through making ratio a be greater than or equal to 0.1 to guaranteed chamfer 201 has sufficient height on apron 200, when making apron 200 in the opening 101 of impressing casing 100, avoid impressing the degree of difficulty too big and the circumstances such as apron 200 and opening 101 card die, in addition, satisfy 0.1 be less than or equal to 0.8 through control chamfer 201 height and apron 200 thickness, reserved certain space for apron 200 week side edge, make apron 200 can stable location in opening 101 department, avoid apron 200 week side edge residual thickness to be too little, lead to apron 200 slope, perk, perhaps cause the circumstances such as shell deformation in the welding process, improved structural reliability.
In one embodiment, the material of the housing 100 comprises steel, and the a ranges from 0.15 to 0.8.
In this embodiment, when the material of the housing 100 includes steel, the value of a may be 0.1, 0.25, 0.5, 0.76 or 0.8. The material through casing 100 includes steel, makes casing 100 have reliable intensity, avoids the condition that the battery core appears expanding in charge and discharge, also can provide bigger accommodation space for inside battery core through reducing casing 100 wall thickness under the condition of guaranteeing casing 100 intensity to set up bigger battery core, promote battery energy density, simultaneously because casing 100 material includes steel, make casing 100 hardness great, apron 200 is more difficult to strut casing 100, and consequently the value of a also correspondingly increases, the apron 200 of being convenient for gets into casing 100.
In one embodiment, referring to fig. 1 to 4, the housing 100 is made of stainless steel, a ranges from 0.25 to 0.7, or the housing 100 is made of nickel-plated steel, a ranges from 0.2 to 0.8.
Stainless steel (STAINLESS STEEL) is a steel having main characteristics of stainless and corrosion resistance, and having a chromium content of at least 10.5% and a carbon content of not more than 1.2% as defined in GB/T20878-2007. Nickel-plated steel is a steel material in which a nickel layer having a thickness of several micrometers is plated on the surface of a steel substrate after a series of treatments.
Specifically, in the present embodiment, when the case 100 is made of stainless steel, the value of a may be 0.25, 0.5, 0.68 or 0.7, and when the case 100 is made of nickel plating, the value of a may be 0.2, 0.27, 0.5, 0.6 or 0.8. The stainless steel is adopted as the material of the shell 100, so that the shell 100 has larger strength, the situation that the battery cell expands in the charging and discharging process can be effectively avoided, and the battery deformation risk is reduced. Meanwhile, the stainless steel has good strength, so that the wall thickness of the shell 100 can be set thinner, more space is provided for the arrangement of the internal battery cells, larger battery cells can be arranged conveniently, and the energy density of the battery is improved.
In this embodiment, because the ductility and vickers hardness of different materials are different, the ratio of the height of the chamfer 201 to the thickness of the cover plate 200 is limited when the housing 100 and the cover plate 200 made of different materials are assembled, so that the cover plate 200 can be smoothly pressed into the corresponding housing 100, and the cover plate 200 is difficult to assemble or difficult to weld due to the excessively large or excessively small ratio a, thereby further reducing the assembly difficulty and guaranteeing the product quality.
In one embodiment, referring to fig. 1-4, the angle between chamfer 201 and the extension of the peripheral side wall of cover plate 200 is in the range of 5 ° to 80 °.
Specifically, the range of the angle between chamfer 201 and the extension line of the side wall on the peripheral side of cover plate 200 may be 5 °, 10 °, 15 °, 34.5 °,50 °, or 80 °.
In this embodiment, under the condition that the included angle between the chamfer 201 and the side wall of the periphery of the cover plate 200 is too small, the cover plate 200 still enters the housing 100 and still receives larger resistance, so that the assembly is difficult, and under the condition that the included angle between the chamfer 201 and the side wall of the periphery of the cover plate 200 is larger, the problem of gaps occurs at the joint of the housing 100 and the cover plate 200, so that the connection between the cover plate 200 and the housing 100 fails, in addition, when the inclination angle is too large, the cover plate 200 and the housing 100 are possibly welded in a top mode, laser penetrates into the battery cell, and damage is caused to the battery cell. Therefore, the present embodiment enables the cover 200 to smoothly enter the housing 100 to achieve assembly by limiting the range of the angle between the chamfer 201 and the peripheral side wall of the cover 200.
In one embodiment, referring to fig. 1-4, chamfer 201 is provided along the perimeter profile of cover plate 200.
In this embodiment, by continuously arranging the chamfer 201 along the peripheral side contour of the cover plate 200, the chamfer 201 can uniformly guide and expand the peripheral side wall of the housing 100 during the process of pressing the cover plate 200 into the housing 100, so that the cover plate 200 is prevented from tilting or tilting under the condition of blocking the cover plate 200.
In one embodiment, referring to FIGS. 1-4, the sidewall thickness of the housing 100 at the opening 101 is d and satisfies 0.4A/d 6.
Specifically, d has a thickness in the range of 0.15mm to 1.0mm, and d may have a value of 0.15mm, 0.2mm, 0.35mm, 0.47mm, 0.8mm, or 1.0mm. The value of a/d may be 0.4, 0.5, 0.78, 1, 1.5, 4.6, 5 or 8.
In this embodiment, since the greater the thickness of the sidewall of the housing 100 at the opening 101, the greater the resistance of the cover 200 is in the process of pressing the cover 200 into the housing 100, and accordingly, the ratio of the height of the chamfer 201 to the thickness of the cover 200 is increased to further reduce the difficulty of pressing the cover 200 into the housing 100, the embodiment prevents the cover 200 from being able to smoothly open the housing 100 by controlling the relationship between the thickness d of the housing 100 and the ratio a, and also prevents the ratio d from being too small, for example, too small and/or too large a, if d is too small, the cover 200 is easily penetrated by laser in the welding process, and too large a causes insufficient residual thickness, and also increases the risk of the cover 200 being penetrated by the laser, thereby affecting the quality of the product. On the premise that the cover plate 200 can be smoothly pressed into the shell 100, the stability of the posture of the cover plate 200 after assembly is also ensured, and in addition, the situation that the welded laser penetrates the cover plate 200 to damage a battery core and deform the shell 100 due to the fact that the residual thickness of the cover plate 200 is small under the condition that the thickness of the shell 100 is small is avoided.
In one embodiment, the housing 100 includes a first end proximate to the cover plate 200 and a second end distal from the cover plate 200, the opening 101 of the housing 100 being located at the first end, the first end sidewall having a thickness less than a thickness of the second end sidewall.
Specifically, the thickness d of the side wall of the casing 100 at the opening 101 is exemplified by providing a stepped hole 102 at the opening 101 of the casing 100 at the first end, so that the thickness of the side wall of the casing 100 at the opening 101 is smaller than the thickness of the side wall of the casing 100 at the position far from the opening 101, and the cover plate 200 is convenient to enter, and the thickness d of the side wall can also be a variable amount which gradually increases from top to bottom along the height direction of the battery (i.e. from the side close to the opening 101 of the casing 100 to the side far from the opening 101 of the casing 100), and exemplified by gradually thickening the thickness of the side wall of the casing 100 from top to bottom along the height direction of the casing 100, or irregularly thickening the thickness of the side wall of the casing 100 from top to bottom along the height direction of the casing 100, etc.
In this embodiment, the thickness of the side wall of the opening 101 of the casing 100 is set to be smaller, so that the cover plate 200 can be used for supporting the casing 100, the cover plate 200 can be smoothly put into the casing, meanwhile, d cannot be too small, the situation that the battery core is damaged due to the fact that the d value is too small and is easy to penetrate by laser in the welding process is avoided, meanwhile, the strength of the casing 100 can be ensured through the thickness thickening of the side wall of the casing 100 except the opening 101, and the situation that the deformation of the casing 100 influences the quality of products is avoided.
In one embodiment, referring to fig. 5 and 6, the housing 100 is provided with a stepped hole 102 at the opening 101, the contour of the stepped hole 102 is the same as the contour of the opening 101 of the housing 100, and the cover 200 is fitted with the stepped hole 102 and is in interference fit with the sidewall of the housing 100 at the stepped hole 102.
In this embodiment, by providing the step hole 102 and assembling the cover plate 200 into the step hole 102, the thickness of the housing 100 at the opening 101 is reduced, so that the cover plate 200 is easier to be pressed into the housing 100, in addition, by providing the step hole 102, even if a part of light beam passes through a gap between the cover plate 200 and the housing 100 in the laser welding process, the bottom of the step hole 102 can only be irradiated, but not the electric core can be irradiated easily, thereby reducing the requirement on the welding process and reducing the welding difficulty of the cover plate 200.
In one embodiment, the housing 100 has an end opening 101 with an area S of 500mm 2 or more and a in the range of 0.25 to 0.8.
The area S of the end opening 101 of the housing 100 is an area of the channel formed by surrounding each side wall of the housing 100, and does not include the thickness of the side wall of the housing 100.
In addition, the value of S may be, in particular, 500mm 2、800mm2、950mm2 or 1000mm 2. The value of a may be 0.25, 0.3, 0.52, 0.7 or 0.8.
In this embodiment, when the area of the opening 101 at the end of the housing 100 is large, the difficulty of the cover 200 in opening the housing 100 is relatively large, so that the assembly difficulty of the housing 100 and the cover 200 with different areas of the opening 101 is reduced by controlling the area S of the opening 101 at the end of the housing 100 and correspondingly controlling the ratio of a/b.
In one embodiment, referring to FIGS. 1-6, the housing 100 is cylindrical, a and b satisfy 0.0005. Ltoreq.a/b.ltoreq.0.01, or the housing 100 is polygonal, a and b satisfy 0.0006. Ltoreq.a/b.ltoreq.0.01.
Specifically, referring to fig. 7 and 8, the prism may be a quadrangular prism or a hexagonal prism. In addition, the value of a/b may be 0.0005, 0.0009, 0.0018, 0.005, or 0.01, particularly when the housing 100 is circular. Where the housing 100 is multi-prismatic, the value of a/b may be 0.0006, 0.0008, 0.0018, 0.005, 0.0095, or 0.01.
In this embodiment, under the condition that the shapes of the cases 100 are different, the difficulty of inserting the cover plate 200 into the case is different, for example, compared with two kinds of battery cases 100 in which the cases 100 are prismatic and the cases 100 are cylindrical, in the process that the cover plate 200 is inserted into the case, the edge position of the prismatic case 100, that is, the included angle position of the cover plate 200 is simultaneously extruded by the side walls on both sides, so that the opening difficulty is relatively high, and the required a and b values are different.
In one embodiment, the battery further comprises a battery core, the battery core comprises a body and a tab, the cover plate 200 is provided with a pole group assembly, the tab comprises a positive pole tab and a negative pole tab, one of the positive pole tab and the negative pole tab is electrically connected with the pole column assembly, the other is electrically connected with the cover plate 200, and the range of a is 0.25 to 0.8.
The electrode assembly can also comprise a pole and a switching piece, wherein the pole is directly connected with the switching piece, and the switching piece is electrically connected with the pole, so that the electric connection between the pole and the electrode assembly is realized.
In this embodiment, the cover 200 is used as an output electrode and is electrically connected with the tab, and the value a is controlled, so that the difficulty of the cover 200 in the shell and the interaction force between the cover 200 and the housing 100 are reduced, and the deformation risk of the cover 200 in the shell is reduced. Since the cover 200 is used as one of the output electrodes and needs to be electrically connected with the busbar and other structures, if the case 100 is deformed, the electrical connection between the cover 200 and the busbar may be affected, and a risk of cold joint may occur.
In the above embodiment, it is worth noting that the positive electrode sheet, the negative electrode sheet and the separator form the battery cell by winding or laminating, the positive electrode sheet includes the positive electrode current collector and the positive electrode active material layer, and the negative electrode sheet includes the negative electrode current collector and the negative electrode active material layer. The positive electrode current collector is not particularly limited as long as it has conductivity without causing adverse chemical changes in the battery, and may use, for example, stainless steel, aluminum, nickel, titanium, fired carbon, or aluminum or stainless steel surface-treated with one of carbon, nickel, titanium, silver, etc., the negative electrode current collector may use copper, stainless steel, nickel, titanium, etc., and in a specific embodiment, the positive electrode current collector may use aluminum, and the negative electrode current collector may use copper. The positive electrode active material layer comprises a positive electrode active material, the positive electrode active material comprises a nickel-cobalt-manganese ternary material, a lithium iron phosphate material, a lithium iron manganese phosphate material and the like, the negative electrode active material layer comprises a negative electrode active material, and the negative electrode active material comprises artificial graphite, natural graphite, a silicon-based material and the like.
According to an embodiment of the present invention, in another aspect, there is also provided a battery pack including at least one of the above-described batteries.
In this embodiment, the battery pack is formed by adopting the above battery, so that the assembly difficulty can be reduced, the structural reliability of the battery pack can be improved, and the product performance can be improved by utilizing the advantages of the above battery.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.
Claims (10)
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| CN202411398934.5A CN118899602B (en) | 2024-10-09 | 2024-10-09 | Battery and battery pack |
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| CN117691269A (en) * | 2024-01-31 | 2024-03-12 | 蜂巢能源科技股份有限公司 | a battery cell |
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| DE112016005157T5 (en) * | 2015-11-10 | 2018-08-02 | Kabushiki Kaisha Toyota Jidoshokki | Power storage device |
| CN113346167B (en) * | 2021-06-04 | 2024-02-02 | 中创新航科技股份有限公司 | Welding method of battery cover |
| CN216161816U (en) * | 2021-08-18 | 2022-04-01 | 上海兰钧新能源科技有限公司 | Battery shell structure |
| CN218334016U (en) * | 2022-09-05 | 2023-01-17 | 苏州中科瑞龙科技有限公司 | Battery shell and battery |
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| CN117691269A (en) * | 2024-01-31 | 2024-03-12 | 蜂巢能源科技股份有限公司 | a battery cell |
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