CN114614189A - Battery module and electronic device - Google Patents
Battery module and electronic device Download PDFInfo
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- CN114614189A CN114614189A CN202210322597.6A CN202210322597A CN114614189A CN 114614189 A CN114614189 A CN 114614189A CN 202210322597 A CN202210322597 A CN 202210322597A CN 114614189 A CN114614189 A CN 114614189A
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- battery module
- battery
- thickness
- buffer member
- gravity
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- 230000005484 gravity Effects 0.000 claims abstract description 36
- 239000000872 buffer Substances 0.000 claims description 93
- 239000007774 positive electrode material Substances 0.000 claims description 10
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 4
- 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 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 16
- 239000000463 material Substances 0.000 description 8
- 239000007773 negative electrode material Substances 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- ADKPKEZZYOUGBZ-UHFFFAOYSA-N [C].[O].[Si] Chemical compound [C].[O].[Si] ADKPKEZZYOUGBZ-UHFFFAOYSA-N 0.000 description 1
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical compound [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910021385 hard carbon Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- DCYOBGZUOMKFPA-UHFFFAOYSA-N iron(2+);iron(3+);octadecacyanide Chemical compound [Fe+2].[Fe+2].[Fe+2].[Fe+3].[Fe+3].[Fe+3].[Fe+3].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] DCYOBGZUOMKFPA-UHFFFAOYSA-N 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000447 polyanionic polymer Polymers 0.000 description 1
- 229960003351 prussian blue Drugs 0.000 description 1
- 239000013225 prussian blue Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910021384 soft carbon Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
- H01M50/291—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs characterised by their shape
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
Abstract
The embodiment of the application discloses battery module and electronic device, including a plurality of battery cells and a plurality of bolster, a plurality of battery cells are along the range upon range of setting of direction of gravity, and the bolster sets up between two adjacent battery cells, and along the direction of gravity, the thickness of the bolster of battery module's the outside is less than the thickness of the most inboard bolster of battery module. The battery units are stacked along the gravity direction, the battery units on the outer side can be extruded by the gravity of the battery units on the inner side, the pressure intensity of the battery units on the outer side is larger, and the expansion of the battery units is smaller.
Description
[ technical field ] A method for producing a semiconductor device
The embodiment of the application relates to the technical field of batteries, in particular to a battery module and an electronic device.
[ background of the invention ]
Energy conservation and emission reduction are the key of sustainable development of new energy industry, and electric vehicles become the important component part of sustainable development of vehicle industry because of its energy-concerving and environment-protective advantage, and electric vehicles continuation of the journey mileage is more and more paid attention to by people, and the energy density of battery module is relevant with electric vehicles' continuation of the journey mileage again, and the higher the energy density is, electric vehicles continuation of the journey mileage is longer, consequently need to design a battery module that can improve energy density urgently.
[ summary of the invention ]
The embodiment of the application aims to provide a battery module and an electronic device, so that the energy density of the battery module can be at least improved.
In order to solve the technical problem, the embodiment of the application adopts the following technical scheme:
in a first aspect, an embodiment of the present application provides a battery module, which includes a plurality of battery cells and a plurality of buffering members, wherein the plurality of battery cells are stacked along a gravity direction, and the buffering members are disposed between two adjacent battery cells. The thickness of the buffer member at the outermost side of the battery module is smaller than the thickness of the buffer member at the innermost side of the battery module along the gravity direction.
The battery units are stacked along the gravity direction, the battery units on the outer side can be extruded by the gravity of the battery units on the inner side, the pressure intensity of the battery units on the outer side is larger, and the expansion of the battery units is smaller.
In some embodiments, the thickness of the buffer members decreases sequentially in the direction of gravity. Along the gravity direction, the thicknesses of the buffer parts are gradually reduced, the thicknesses of the buffer parts are set according to the pressure or the pressure intensity applied to each battery unit, the space of the battery module can be fully saved, and therefore the energy density of the battery module is improved
In some embodiments, the direction of gravity is the thickness direction of the battery cell. Since the expansion of the battery cells outside in the direction of gravity is small, the battery cells can be made to utilize the partially reduced expansion space, and the energy density of the battery module can be increased by increasing the thickness of a part of the battery cells.
In some embodiments, the thickness of the battery unit is D mm and the pressure applied to the buffer member near the outer side of the battery module is P in the gravity direction1kPa, the pressure of the buffer part far away from the outer side of the battery module is P2kPa, the difference DeltaD between the thickness of the buffer member near the outer side of the battery module and the thickness of the buffer member far from the outer side of the battery module satisfies 0<ΔD≤(P1-P2)D/320。
According to the formula, the expansion difference between the battery unit close to the outer side of the battery module and the battery unit close to the inner side of the battery module can be calculated, the expansion difference is the thickness difference between the buffer member close to the outer side of the battery module and the buffer member close to the inner side of the battery module, the thickness close to the outer side buffer member can be correspondingly reduced, the thickness difference exists between the buffer member close to the outer side of the battery module and the buffer member close to the inner side of the battery module, and therefore the energy density of the battery module is improved.
In some embodiments, the thickness of the buffer member includes a plurality of gradient sections along the gravity direction, and the difference between the thicknesses of the buffer members located in the same gradient section is 0mm to 0.1 mm. Through setting up the gradient interval, can correspondingly reduce the thickness specification of bolster, the bolster in same interval can adopt same production technology to carry out batch production to improve production efficiency.
In some embodiments, among the buffers with different thicknesses, the buffer with larger thickness is formed by stacking a plurality of buffers with smaller thickness. The thickness of the buffer parts is increased in a laminating mode, so that the buffer parts in all gradient intervals can be produced in batch by adopting the same production process, and the production efficiency is effectively improved.
In some embodiments, the battery module further includes a housing, the housing includes a bottom plate and a side plate, the side plate is mounted on the bottom plate, the bottom plate and the side plate jointly enclose a containing cavity, the plurality of battery units and the plurality of buffer members are contained in the containing cavity, the plurality of battery units and the plurality of buffer members are supported on the bottom plate, and a direction from the containing cavity to the bottom plate is a stacking direction of the plurality of battery units. When the battery units and the buffer members are borne on the bottom plate, under the action of gravity, the battery units and the buffer members on the outer side of the battery module can bear larger pressure, the expansion of the battery units on the outer side of the battery module is smaller, and the thickness of the buffer members on the outer side of the battery module is smaller.
In some embodiments, the surface of the side plate facing the accommodating cavity is provided with a plurality of limiting grooves. One battery unit can be correspondingly arranged in one limiting groove, so that the battery units can be conveniently positioned and installed.
In some embodiments, the battery cell includes a positive electrode sheet including a positive active material including at least one of lithium iron phosphate or lithium manganese iron phosphate.
According to some embodiments of the present application, in a second aspect, the present application further provides an electronic device including the battery module according to any one of the above embodiments.
The battery module disclosed in the embodiment of the application can be used in electronic devices such as energy storage devices, vehicles, ships or aircrafts, but not limited thereto. The power supply system with the battery unit or the battery module disclosed by the application can be used, so that the cruising ability of the electronic device is improved.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
[ description of the drawings ]
One or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.
Fig. 1 is a schematic structural view of a battery module according to some embodiments of the present disclosure;
fig. 2 is a schematic view of the internal structure of a battery cell according to some embodiments of the present disclosure;
fig. 3 is a schematic structural view of a battery module according to some embodiments of the present disclosure;
fig. 4 is a schematic structural view of a battery module according to some embodiments of the present application;
fig. 5 is a schematic structural view of a battery module according to some embodiments of the present application;
fig. 6 is a schematic structural view of a battery module according to some embodiments of the present application;
FIG. 7 is a graph illustrating a pressure versus differential expansion curve for a battery cell according to some embodiments of the present disclosure.
In the figure:
10. a battery cell; 11. a positive electrode plate; 111. a positive electrode active material layer; 12. an isolation film; 13. a negative pole piece; 131. a negative electrode active material layer;
20. a buffer member; 20a, a first buffer member; 20b, a second cushion member; 20c, a third cushion member;
30. a housing; 31. a base plate; 32. a side plate; 33. a limiting groove;
100. a first gradient interval;
200. a second gradient interval;
300. a third gradient interval.
[ detailed description ] embodiments
In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. It is noted that when an element is referred to as being "secured to"/"mounted to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," "inner," "outer," and the like as used herein are for descriptive purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In addition, the technical features mentioned in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other. The term "a plurality" in the embodiments of the present application means two or more; "several" to more than one.
In this specification, the term "mount" includes welding, screwing, clipping, adhering, etc. to fix or restrict a certain element or device to a specific position or place, the element or device may be fixed or movable in a limited range in the specific position or place, and the element or device may be dismounted or not dismounted after being fixed or restricted to the specific position or place, which is not limited in the embodiment of the present application.
Referring to fig. 1, the battery module includes a plurality of battery cells 10 and a plurality of buffer members 20, wherein the plurality of battery cells 10 are stacked along a gravity direction, and the buffer members 20 are disposed between two adjacent battery cells 10. The thickness of the buffer member at the outermost side of the battery module is smaller than the thickness of the buffer member at the innermost side of the battery module along the gravity direction. It should be noted that, along the direction of gravity, the inner side is the portion of the battery module in fig. 1 near the upper layer, and the outer side is the portion of the battery module in fig. 1 near the lower layer.
As for the battery unit 10, the battery unit 10 is the smallest unit constituting a battery or a battery module, and is a place for realizing conversion between electric energy and chemical energy, and a plurality of battery units 10 may be combined in series, parallel, or series-parallel to form a battery or a battery module. Referring to fig. 1, a plurality of battery cells 10 are stacked in a direction G in fig. 1, and the plurality of battery cells 10 are coupled to each other in a manner including, but not limited to, the series connection, the parallel connection, or the series-parallel connection, and it is noted that the direction G in fig. 1 may be a thickness direction of the battery cells 10 and a gravity direction.
Referring to fig. 2, fig. 2 shows an internal structure of the battery unit 10, the battery unit 10 includes a positive electrode tab 11, a separator 12, and a negative electrode tab 13, and the positive electrode tab 11, the separator 12, and the negative electrode tab 13 are stacked and wound. The positive electrode sheet 11 is coated with a positive electrode active material layer 111, and the negative electrode sheet 13 is coated with a negative electrode active material layer 131. Both types of active material layers generally include a conductive agent, a dispersant, a binder, and the like. For the negative electrode active material layer 131, for example, a negative electrode active material such as hard carbon, soft carbon, graphite, lithium metal, silicon carbon oxygen, or lithium titanate can be selected. For the positive electrode active material layer 111, some common positive electrode active materials may be used, for example: lithium cobaltate, lithium-rich manganese base, lithium iron phosphate manganese, nickel cobalt manganese ternary, lithium manganate, polyanion compound, prussian blue and the like, and the positive active material layer 111 can be one or more of the above positive active materials. As the positive electrode active material layer 111 and the negative electrode active material layer 131 are intercalated into or deintercalated from ions during charge and discharge cycles of the battery cell 10, the positive electrode tab 11 and the negative electrode tab 13 of the battery cell 10 may be expanded outward, and in order to alleviate the expansion of the battery cell 10, an expansion space may be reserved for the battery cell 10. Because the energy density of the battery unit 10 of the lithium iron phosphate system is low, in the embodiment of the present application, the energy density can be improved for the whole by reducing the partial expansion space of the battery module.
Referring to fig. 1, the buffer member 20 is disposed between two adjacent battery cells 10, and the buffer member 20 is configured to compress when the battery cells 10 expand, so as to provide an expansion space and a buffer force for the battery cells 10. The cushion 20 may be made of foam, and in other embodiments, the cushion 20 may also be made of other flexible members with a cushion function.
The plurality of battery units 10 are horizontally stacked in the thickness direction to ensure the consistent state of each battery unit 10, however, the battery units 10 are horizontally stacked in the thickness direction, so that the battery units 10 are not stressed during use, and the reserved space between the battery units 10 is also a fixed value. In the present embodiment, as shown in fig. 1, the battery cells 10 may be vertically stacked along the thickness direction thereof, that is, the stacking direction is parallel to the gravity direction, the battery cells 10 near the lower layer (outside) are pressed by the gravity of the battery cells 10 near the upper layer (inside), because the upper surface areas of the battery cells 10 are the same and are fixed, the pressure applied to the battery cells 10 is also different, the pressure applied to the battery cells 10 at the lower layer is larger, and the expansion is smaller, so that the partial expansion space of the battery cells 10 at the lower layer can be reduced, that is, the thickness of the buffer member 20 is reduced, so as to increase the energy density of the battery module.
The expansion of the battery cells 10 may be different in consideration of the non-uniform pressure applied to the battery cells 10, and thus, the buffers 20 having different thicknesses may be used. For example, the lower cell 10 is stressed most and expands less, and the lower cell 10 may employ a buffer member 20 having a smaller thickness; the upper battery cell 10 is subjected to a small pressure and expands more, so that the buffer member 20 having a large thickness can be used.
The pressure applied to each battery cell 10 is gradually increased along the gravity direction, and the expansion of the plurality of battery cells 10 is gradually reduced, so that the thickness of the plurality of buffers 20 is gradually reduced along the gravity direction in some embodiments, as shown in fig. 1. The thickness of the buffer member 20 is set according to the pressure or pressure applied to each battery cell 10, so that the space of the battery module can be sufficiently saved, thereby improving the energy density of the battery module.
Since the lower battery cell 10 has less swelling and accordingly reduces a portion of the swelling space, which can also be directly used by the battery cell 10, that is, the lower layer may use the battery cell 10 having a larger thickness, and the upper layer may use the battery cell 10 having a smaller thickness, in some embodiments, as shown in fig. 3, the thickness of the plurality of battery cells 10 gradually increases along the direction of gravity. By increasing the thickness of a portion of the battery cell 10, accordingly, the energy density of the battery module may be improved. It should be noted that in other embodiments, the thickness of the lower cushion member 20 may be reduced and the thickness of the lower battery cell 10 may be increased to fully utilize the reduced partial expansion space.
When the mass of the battery unit 10 is small, the pressure difference between two adjacent battery units 10 is also small along the stacking direction of the plurality of battery units 10, for example, the mass of the battery unit 10 may be 0.5kg to 1.5kg, the pressure difference between two adjacent battery units 10 is 4.9N to 14.7N along the gravity direction, the pressure difference between two adjacent battery units 10 is small, and the small pressure difference has a small influence on the expansion of the battery unit 10. Therefore, in the specific implementation, along the gravity direction, a plurality of gradient sections may be set according to the thickness of the buffer member 20, each gradient section includes a plurality of buffer members, the thickness of the buffer members 20 located in the same gradient section may be set to be the same, or the thickness difference of each buffer member 20 in the same gradient section is 0mm to 0.1 mm. In this embodiment, by setting the gradient section, the thickness specification of the buffer member 20 can be reduced accordingly, and the buffer members 20 in the same section can be mass-produced by the same production process, so as to improve the production efficiency. It should be noted that, in this embodiment, the same thickness specification refers to each buffer member 20 having a thickness difference of 0mm to 0.1mm, and the buffer members 20 of the same specification are manufactured by the same manufacturing process, so that the buffer members 20 of the same specification have a smaller thickness difference due to a manufacturing error.
In general, the number of battery cells 10 in each gradient section is the same, and the thicknesses of the plurality of gradient sections gradually decrease in the direction of gravity. Specifically, the two gradient sections are provided, and the thickness difference of the buffer member 20 in the two adjacent gradient sections is 0.2mm to 0.3mm or 0.4mm to 0.6 mm. Alternatively, as shown in fig. 4, there are three gradient sections, namely a first gradient section 100, a second gradient section 200 and a third gradient section 300, and the thickness difference between the buffer members 20 in two adjacent gradient sections is 0.15mm to 0.25mm or 0.3mm to 0.5 mm. The number of gradient sections may be set according to specific practical conditions, and is not limited to two or three in the present embodiment, and may be set to four, five or more gradient sections when the number of battery cells 10 is large. The thickness difference of the buffer parts 20 in the two adjacent gradient intervals can be set correspondingly according to specific conditions, and the thickness difference is not limited to 0.2mm to 0.3mm, 0.4mm to 0.6mm, 0.15mm to 0.25mm or 0.3mm to 0.5mm in the embodiment; for example, when the mass of the battery cell 10 is large, the thickness difference may be increased accordingly. It should be noted that, in other embodiments, the number of the battery cells 10 in each gradient interval may be different or partially the same.
As shown in fig. 5, in order to facilitate the production of the buffer member 20, a plurality of buffer members 20 with smaller thickness may be stacked to form a buffer member 20 with larger thickness, that is, among the buffer members 20 with different thicknesses, the buffer member 20 with larger thickness is formed by stacking a plurality of buffer members 20 with smaller thickness. In other embodiments, the battery module is divided into a plurality of gradient sections, specifically, three gradient sections are taken as an example, a first cushion material 20a is disposed in the first gradient section 100, a second cushion material 20b is disposed in the second gradient section 200, and a third cushion material 20c is disposed in the third section, wherein the second cushion material 20b is formed by stacking two first cushion materials 20a, and the third cushion material 20c is formed by stacking three first cushion materials 20 a. The buffer parts 20 in each gradient interval can be produced in batch by adopting the same production process, and the thickness of the buffer parts 20 is increased in a laminating mode, so that the production efficiency can be effectively improved.
Referring to fig. 6, after the battery cells 10 are stacked, the stacked battery cells can be placed in the housing 30, the housing 30 includes a bottom plate 31 and two side plates 32, the side plates 32 are mounted on the bottom plate 31, the two side plates 32 can be disposed, and the two side plates 32 are disposed opposite to each other. The bottom plate 31 and the side plate 32 together enclose a containing cavity, the plurality of battery units 10 and the plurality of buffer members 20 are contained in the containing cavity, the plurality of battery units 10 and the plurality of buffer members 20 are loaded on the bottom plate 31, and the stacking direction of the plurality of battery units 10 is the direction from the containing cavity to the bottom plate 31. When the plurality of battery cells 10 and the plurality of cushion members 20 are supported on the bottom plate 31, the lower battery cells 10 and the lower cushion members 20 are stressed by gravity, and the lower battery cells 10 are expanded to a smaller extent, i.e., the thickness of the lower cushion members 20 is smaller. In other embodiments, a plurality of limiting grooves 33 are disposed on the surface of the side plate 32 facing the receiving cavity, and one battery unit 10 can be disposed in one limiting groove 33, so as to facilitate positioning and installation of each battery unit 10.
Referring to fig. 7, fig. 7 shows the relationship between the pressure and the expansion difference of the battery cell 10, wherein the dashed line portion is an unpressurized cycle curve, and the solid line portion is a pressurized 60kg cycle curve. Taking the conventional battery cell 10 of the lithium iron phosphate system as an example, the energy density of the battery module can be increased by providing the buffer members 20 having different thickness dimensions.
Specifically, taking the following battery cell 10 as an example, the mass of the battery cell 10 is about 0.9kg, and the battery cell 10 is a flexibly-packaged battery cell 10 having the following dimensions: length is 147mm, 100mm wide and 15.7mm thick, the specific dimensions of the cell 10 can be measured by a micrometer screw or other dimensional measuring tool. Since the edges of the battery cell 10 are curved, the actual width of the battery cell 10 measured by removing the curved edges is 100-15.7-84.3 mm, and the upper surface area is 12392mm2According to the pressure calculation formula, the pressure applied to the battery unit 10 is 4.8kPa, as shown in fig. 7, after 800 cycles, the expansion difference of the battery unit 10 is 1.5%, which is converted into 3.2 kPa/1% expansion difference.
Taking fifteen battery cells 10 stacked in sequence as an example, the difference in expansion between the uppermost battery cell 10 and the lowermost battery cell 10 is calculated based on the battery module, and the pressure applied to the lowermost battery cell 10 is about 0.9 × (15-1) ═ 12.6kg, that is, the pressure difference between the lowermost battery cell 10 and the uppermost battery cell 10 is 1kPa, the battery thickness is 15.7mm, and the difference in expansion is 0.47 mm.
It can be estimated from the above calculation flow that, in the stacking direction of the plurality of battery cells 10, the difference Δ D between the thickness of the cushion member near the outside of the battery module and the thickness of the cushion member near the inside of the battery module satisfies 0<ΔD≤(P1-P2) D/320, wherein the thickness of the battery unit is D mm, and the pressure on the buffer piece far away from the outer side of the battery module is P1kPa, the pressure of the buffer part close to the outer side of the battery module is P2kPa. The expansion space of the lower battery cell 10 can be correspondingly reduced according to the expansion difference of the battery cells, that is, the thickness of the buffer member is reduced, so that the energy density of the battery module can be effectively improved.
If the battery module has three gradient sections, the thickness of the buffer member 20 of base +0.2(M-1) may be selected, where base is the thickness of the buffer member at the bottommost layer, M is the mth gradient section along the stacking direction of the plurality of battery cells 10, and M is 1, 2, or 3. The total thickness of the battery module is reduced by 0.4 × 4+0.2 × 4 to 2.4mm, the total thickness is 15.7 × 15+ base × 14 to 249.5mm, and the energy density is increased by about 1% when the base is 1 mm.
In the embodiment of the application, the plurality of battery units 10 are stacked in the gravity direction, the battery unit 10 on the lower layer is extruded by the gravity of the battery unit 10 on the upper layer, the pressure applied to the battery unit 10 on the lower layer is larger, and the expansion of the battery unit 10 on the lower layer is smaller, so that the partial expansion space of the battery unit 10 on the lower layer can be reduced, that is, the thickness of the buffer member 20 is reduced, the thickness of the buffer member 20 is gradually reduced in the gravity direction, the thickness of the buffer member 20 is determined according to the pressure or the pressure applied to each battery unit 10, the material cost of the buffer member 20 can be reduced, the space of the battery module can be fully saved, and the energy density of the battery module can be improved; moreover, by setting the gradient section, the thicknesses of the buffer members 20 in the same gradient section can be set to be the same, or the thickness difference of the buffer members 20 in the same gradient section is 0mm to 0.1mm, so that the thickness specification of the buffer members 20 can be correspondingly reduced, and the buffer members 20 in the same section can be produced in batch by adopting the same production process, so that the production efficiency is improved; in addition, the buffer member 20 with the larger thickness can be formed by stacking a plurality of buffer members 20 with the smaller thickness, and the thickness of the buffer member 20 is increased in a stacking manner, so that the buffer members 20 in each gradient interval can be produced in batch by adopting the same production process, and the production efficiency is effectively improved.
In this application, the thickness of the buffer member 20 can be recovered to its form by taking out the buffer member 20 from the battery module and then standing for 24 hours, and then measuring its thickness by a dimension measuring instrument such as a micrometer.
An embodiment of the present application further provides an electronic device including the battery module according to any of the above embodiments.
The battery module that this application embodiment disclosed can but not be arranged in vehicle, boats and ships or aircraft etc. electron device. The power supply system including the battery unit 10 or the battery module disclosed in the present application may be used to form the electronic device, which is advantageous for improving the cruising ability of the electronic device.
The electronic device using the battery module as the power supply provided by the embodiment of the application can be but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; within the context of the present application, where technical features in the above embodiments or in different embodiments can also be combined, the steps can be implemented in any order and there are many other variations of the different aspects of the present application as described above, which are not provided in detail for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. The utility model provides a battery module, includes a plurality of battery cell and a plurality of bolster, and is a plurality of the battery cell is along the range upon range of setting of direction of gravity, the bolster sets up in adjacent two between the battery cell, its characterized in that follows the direction of gravity, battery module's the outside the thickness of bolster is less than battery module's the most inboard the thickness of bolster.
2. The battery module according to claim 1, wherein the thickness of the buffer member is sequentially reduced in the gravity direction.
3. The battery module according to claim 1, wherein the gravity direction is a thickness direction of the battery cell.
4. The battery module according to claim 1, wherein the thickness of the battery cell is D mm and the buffer member near the outer side of the battery module is pressed by P in the direction of gravity1kPa, farThe buffer part away from the outer side of the battery module is subjected to pressure P2kPa, the difference between the thickness of the buffer member close to the outer side of the battery module and the thickness of the buffer member far from the outer side of the battery module is DeltaD, 0<ΔD≤(P1-P2)D/320。
5. The battery module according to claim 1, wherein the thickness of the buffer member includes a plurality of gradient sections along the gravity direction, and the difference in thickness of the buffer member located in the same gradient section is 0mm to 0.1 mm.
6. The battery module according to any one of claims 1 to 5, wherein the buffer member having a larger thickness is formed by stacking a plurality of buffer members having a smaller thickness among the buffer members having different thicknesses.
7. The battery module according to any one of claims 1 to 5, further comprising a case;
the casing includes bottom plate and curb plate, the curb plate install in the bottom plate, bottom plate and curb plate enclose jointly and accept the chamber, a plurality of battery cell and a plurality of bolster accept in accept the chamber, a plurality of battery cell and a plurality of bolster bear in the bottom plate, it is past to accept the chamber the direction of bottom plate is a plurality of battery cell's range upon range of direction.
8. The battery module according to claim 7, wherein a plurality of limiting grooves are formed in the surface of the side plate facing the accommodating cavity.
9. The battery module according to any one of claims 1 to 5, wherein the battery unit comprises a positive electrode sheet, the positive electrode sheet comprises a positive active material, and the positive active material comprises at least one of lithium iron phosphate or lithium manganese iron phosphate.
10. An electronic device comprising the battery module according to any one of claims 1 to 9.
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| CN202210322597.6A CN114614189A (en) | 2022-03-29 | 2022-03-29 | Battery module and electronic device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210322597.6A CN114614189A (en) | 2022-03-29 | 2022-03-29 | Battery module and electronic device |
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| CN202210322597.6A Pending CN114614189A (en) | 2022-03-29 | 2022-03-29 | Battery module and electronic device |
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