CN114497870B - Battery pack balanced pressurization equipment, battery pack preparation method and battery module - Google Patents
Battery pack balanced pressurization equipment, battery pack preparation method and battery module Download PDFInfo
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- CN114497870B CN114497870B CN202210357194.5A CN202210357194A CN114497870B CN 114497870 B CN114497870 B CN 114497870B CN 202210357194 A CN202210357194 A CN 202210357194A CN 114497870 B CN114497870 B CN 114497870B
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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
- H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
- H01M50/264—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0481—Compression means other than compression means for stacks of electrodes and separators
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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
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
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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
- H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
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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
- H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
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- 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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention relates to a battery pack balanced pressurization device, a battery pack preparation method and a battery module, wherein the pressurization device comprises a frame part and a pressurization part; the frame part comprises a baffle plate surrounded at the periphery, and a battery array can be contained in the frame part; the pressurizing part is arranged between the baffle and one side of the battery array, the surface of one side, facing the battery array, of the pressurizing part is a pressurizing surface, the pressurizing surface comprises N matching surfaces, and each matching surface is used for applying pressure to the corresponding longitudinal battery row; the pressurizing part can expand along with the injection of the fluid, so that the N matching surfaces of the pressurizing part press the battery array, and the pressure applied by the N matching surfaces to the corresponding longitudinal battery columns is the same. According to the invention, higher electric connection stability and better contact resistance consistency can be brought between the single batteries in the battery pack. By means of the pressurizing device, the single cylindrical battery can be efficiently electrically connected and mounted in the frame portion, and production efficiency is improved.
Description
Technical Field
The invention relates to the field of new energy power batteries, in particular to a battery pack balanced pressurization device, a battery pack preparation method and a battery module.
Background
The grouping application field of the vehicle-mounted power battery PACK of the pure electric vehicle is developing towards the CTP (CELL TO PACK) technology direction with high energy density and integral quick grouping (PACK). The cell size of industry standard cylindrical power cells is expanding from 21700 (diameter 21mm, height 70 mm) to 46800 (diameter 46mm, height 80 mm). The improvement of convenience and reliability of various electric connection operations in the grouping process from the single cylindrical battery to the battery pack is a key problem which is important to solve by the CTP technology. In the process of grouping the CTP of the single cylindrical batteries in rows, for the characteristic that the side casing of the single cylindrical battery is one of two poles of the battery, the serial connection and the parallel connection between the single batteries are usually realized technically by electrically connecting a power connection bridge on the side casing and then connecting the power connection bridge to the opposite pole at the top of the adjacent battery or the same pole of the side casing of the adjacent battery. The electrical connections between the bridge and the side housing are made integrally, usually by cold-welding, crimping, and gluing, and therefore, it is necessary to press the ends of the row inwardly to achieve a secure connection and minimize contact resistance between the bridge and the cylindrical side housing. But because of the tolerance of different single cylindrical battery diameters, the length of the battery row also has accumulated tolerance. If the integral pressurizing mode of the end parts of the same plane is adopted for a plurality of battery rows which are arranged in parallel, the same pressurizing between the battery rows cannot be ensured, so that the contact resistance which further influences the internal electric connection points of the rows and the rows between the rows is greatly different, and the precise and balanced grouping is not facilitated. Further, in the current battery CTP grouping process, a battery bank or a module needs to be pressurized and sealed outside the battery box and then placed in the battery box, so that the steps are complicated, and the production efficiency is low.
Therefore, how to realize that the single cylindrical battery directly enters the box and realize the integral balanced electric connection among a plurality of lateral electric connection points and the structural solid seal of the direct battery pack in the box by applying pressure to all rows in the battery box in a balanced lateral direction becomes a technical problem which needs to be solved urgently in the industry at present.
Disclosure of Invention
The invention discloses a battery pack balanced pressurization device, a battery pack preparation method and a battery module, and aims to solve the technical problems in the prior art.
The invention adopts the following technical scheme:
in one aspect, the present invention provides a battery pack equalizing pressure device, comprising a frame portion and a pressure portion;
the frame part is used for accommodating a battery array formed by longitudinally and transversely arranging a plurality of upright single cylindrical batteries, the battery array comprises N longitudinal battery rows which are arranged in parallel, and N is more than or equal to 2; the frame part comprises a baffle plate surrounded at the periphery, and the height of the baffle plate is not less than half of the height of the single cylindrical battery;
the pressurizing part is at least arranged between the baffle and one side of the battery array, the surface of the pressurizing part facing one side of the battery array is a pressurizing surface, the pressurizing surface comprises a flexible material, the pressurizing surface comprises N matching surfaces, and each matching surface is used for applying pressure to the corresponding longitudinal battery row; the pressurizing part is provided with a through inner part and can be pressurized and expanded along with the injection of fluid into the pressurizing part, so that the N matching surfaces of the pressurizing part are respectively abutted in a self-adaptive manner and press the N vertical battery rows, and the pressure applied to the corresponding vertical battery rows by the N matching surfaces is the same.
As a preferred technical scheme, the height of the matching surface is not less than half of the height of the pole of the shell at the side surface of the single cylindrical battery.
Preferably, when the N matching surfaces have different expansion advance lengths, the pressure applied to the corresponding longitudinal cell rows by the N matching surfaces is the same.
As a preferable technical scheme, the pressurizing surface is attached to the shell pole of all the single cylindrical batteries in the first row of transverse battery rows.
As a preferred technical scheme, the matching surface is a cylindrical surface matched with the pole of the single cylindrical battery shell.
Preferably, the mating surface has a rigid contact surface.
As a preferred technical scheme, a plurality of linked pressurizing parts are arranged on the same side of the baffle, the pressurizing surfaces of the linked pressurizing parts are respectively and correspondingly attached to the shell pole columns of part of the single cylindrical batteries in the first row of transverse battery rows side by side, and all the pressurizing surfaces cover the shell pole columns of all the single cylindrical batteries in the first row of transverse battery rows in an non-overlapping manner; the pressures in the plurality of interlocked pressurizing portions are equal.
Preferably, the frame portion comprises a closed and stable rectangular frame surrounded by the baffles.
As a preferable technical scheme, the inner side surface of the baffle is provided with an elastic anti-seismic flame-retardant insulating material.
Preferably, the frame portion is a case of the battery pack, or the frame portion is a part of the case of the battery pack.
Preferably, the battery pack case includes a plurality of identical frame portions.
Preferably, the pressurizing unit includes an inflatable balloon or a liquid bladder.
Preferably, the pressurizing unit has a fluid passage.
Preferably, the pressurizing unit includes a first pressurizing unit capable of pressurizing the vertical cell row and a second pressurizing unit capable of pressurizing the horizontal cell row.
In the preferred technical scheme, in the battery array, the longitudinal battery rows are electrically connected in series; the transverse cell rows are electrically connected in parallel.
Preferably, the pressure threshold of the first pressurizing unit is larger than the pressure threshold of the second pressurizing unit.
As a preferred technical scheme, the pressurizing device further comprises a pressure control unit, wherein the pressure control unit comprises a pressure detection module and a pressurizing module; the pressure control unit is connected with the pressurizing part and is used for controlling the volume, the speed and the pressure of the fluid poured into the pressurizing part; the pressure applying module is controlled by a set pressure threshold, the pressure detecting module detects that the pressure in the pressure applying part reaches the pressure threshold, and the pressure applying module stops applying pressure to the pressure applying part to ensure the pressure applying consistency of the battery arrays of multiple batches.
As a preferred technical solution, the pressurization device further includes a pressure display unit, and the pressure display unit is connected to the pressure control unit and the pressurization portion, respectively, and is used for displaying the pressure provided by the pressurization portion to the battery array.
In another aspect, the present invention provides a method of manufacturing a battery pack using the above battery pressurizing apparatus, comprising:
sequentially placing a plurality of single cylindrical batteries into a frame part of a pressurizing device to form a rectangular battery array;
structural adhesive and/or an electric bridge and/or cold welding adhesive and/or an insulating connecting piece are arranged between side shell pole columns of adjacent single cylindrical batteries in the battery array;
placing the pressurizing part into the frame part;
injecting fluid into the pressurizing part;
the pressurizing part pressurizes along the length direction of a longitudinal battery row and/or a transverse battery row in the battery array to tightly press the battery array;
controlling the pressurizing part to enable the pressures of the pressurizing part on different longitudinal battery columns and/or transverse battery rows to reach corresponding preset values;
the pressurizing part was depressurized and taken out to obtain a battery pack.
As the preferred technical scheme, the longitudinal battery rows are arranged in series; the transverse cell rows are parallel connected.
As a preferred technical scheme, after the battery pack is pressurized, structural adhesive arranged between the single cylindrical batteries is mutually squeezed and integrally cured; and solidifying the electric bridge and/or the cold welding glue.
Preferably, the longitudinal battery row comprises a plurality of insulation connecting parts for insulating between single cylindrical batteries and/or between electric connectors and filling the ends of the longitudinal battery row which is arranged in a staggered mode.
According to a preferable technical scheme, the frame part and the battery array are combined into a battery module; or the M frame parts and the M battery arrays are combined into a battery module, and M is more than or equal to 2.
In another aspect, the present invention also provides a battery module produced by the above method, the battery module comprising a combination of at least one frame portion and a battery array.
The technical scheme adopted by the invention can achieve the following beneficial effects:
the invention provides a battery pack equalizing and pressurizing device, which mainly structurally comprises a frame part for accommodating a battery array and a pressurizing part for pressurizing the battery array, wherein the pressurizing part is preferably an inflatable air bag or a liquid bag, can be flexibly attached to the side part of each single cylindrical battery on one side of the battery array along with the injection of fluid, and can pressurize in an equalizing manner so as to ensure that the pressure between a row-indirect electric bridge and the single cylindrical batteries is the same, so that higher electric connection stability and better contact resistance consistency are brought between the single cylindrical batteries in a pack. Another aspect of the present invention provides a method for manufacturing a battery pack, in which the above-described pressing apparatus is used to efficiently complete electrical connection and installation of a single cylindrical battery in a frame portion of the pressing apparatus, thereby improving production efficiency.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below to form a part of the present invention, and the exemplary embodiments and the description thereof illustrate the present invention and do not constitute a limitation of the present invention. In the drawings:
fig. 1 is a schematic structural diagram of a battery pack equalizing and pressurizing device disclosed in embodiment 1 of the present invention;
fig. 2 is a top view of the apparatus for equalizing and pressurizing a battery pack disclosed in embodiment 1 of the present invention;
FIG. 3 is a sectional view taken along line B-B of FIG. 2;
fig. 4 is a schematic structural diagram of a first pressing portion disclosed in embodiment 1 of the present invention;
description of reference numerals:
a frame portion 10; a pressing section 20, a first pressing section 21, a second pressing section 22; a single cylindrical battery 30, a top terminal 31; a bridge 40; a bus bar 50; structural adhesive 60.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. In the description of the present invention, it is noted that the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present application, the terms "first," "second," and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.
It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
To solve the problems in the prior art, the present embodiment provides, in part, a battery pack equalizing pressure device including a frame portion 10 and at least one pressure portion 20; the frame part 10 is used for accommodating a battery array formed by longitudinally and transversely arranging a plurality of upright single cylindrical batteries 30, wherein the battery array comprises N longitudinal battery rows which are arranged in parallel, and N is more than or equal to 2; the frame part 10 comprises a baffle plate surrounded at the periphery, and the height of the baffle plate is not less than half of the height of the single cylindrical battery 30; the pressurizing part 20 is at least arranged between the baffle and one side edge of the battery array, the surface of one side of the pressurizing part 20 facing the battery array is a pressurizing surface, the pressurizing surface comprises a flexible material, the pressurizing surface comprises N matching surfaces, and each matching surface is used for applying pressure to the corresponding longitudinal battery row; the pressurizing part is provided with a through inner part, the pressurizing part can be pressurized and expanded along with the injection of the fluid into the pressurizing part, so that the N matching surfaces of the pressurizing part are respectively abutted and pressed on the N vertical battery rows in a self-adaptive manner, and the pressures applied to the corresponding vertical battery rows by the N matching surfaces are the same.
Example 1
The present example 1 provides a battery pack equalizing pressure device for preparing a single cylindrical battery 30 into CTP modules connected in series in rows and in parallel between rows, which is particularly suitable for the preparation process of a power battery unit of a new energy vehicle, and is also suitable for low-speed electric vehicles, electric bicycles and other energy storage products.
The single cylindrical battery 30 in this embodiment is a high energy density power battery, and may be selected from, but not limited to, 18650 batteries, 21700 batteries, 46800 batteries, and the like.
As shown in fig. 1 to 4, the battery pack equalizing and pressurizing apparatus in the present embodiment does not include the single cylindrical batteries 30 shown in the drawings, but is provided solely as a structure for grouping the single cylindrical batteries 30.
The embodiment provides a battery pack equalizing and pressurizing device, which comprises a frame part 10 and a pressurizing part 20, wherein a battery array formed by longitudinally and transversely arranging a plurality of upright single cylindrical batteries 30 can be accommodated in the frame part 10, and the pressurizing part 20 is used for pressurizing the battery array; as shown in fig. 1, the pressurizing portion 20 and the battery array are both provided in the frame portion 10, and the pressurizing portion 20 is provided between the baffle and one side of the battery array so as to be inflatable. When the pressing part 20 is pressed and withdrawn from the frame part 10, the frame part 10 and the battery array (and the electrical connection members in the battery array) constitute the battery pack, and the frame part 10 is a casing of the battery pack or a part of the casing of the battery pack; preferably, a plurality of identical frame portions are included in the battery pack case.
In one embodiment, the frame portion 10 comprises a closed and stable rectangular frame consisting of a surrounding baffle and a bottom plate, the size of the frame is adapted to the volume of the expanded pressing portion 20 and the battery array, and the height of the baffle is preferably not less than half of the height of the single cylindrical battery 30. In fig. 1, a 5X5 battery array is provided, and it should be understood by those skilled in the art that the battery pack may also be a 4X4 array, a 6X4 array, an 8X4 array, a 10X4 array, an 8X20 array, an 8X40 array, and the like, and the specific number may be freely adjusted according to actual production needs, and this embodiment does not limit the lateral and longitudinal expansion of the battery array. For convenience of explanation, referring to fig. 2, in fig. 2, vertical lines are shown as the horizontal cell rows described in the embodiment, and horizontal lines are shown as the vertical cell columns described in the embodiment. Preferably, the battery array has N longitudinal battery rows which are arranged in parallel, and N is more than or equal to 2.
The bottom plate and the baffle of the frame part 10 are made of insulating materials, preferably, the inner side surface of the baffle is provided with the insulating materials with certain elasticity, so that certain buffering can be provided, the deformation of the side parts of the single cylindrical batteries 30 due to overlarge pressure when the pressurizing part 20 expands can be avoided, and meanwhile, the insulation between the side parts of the single cylindrical batteries 30 in the same transverse battery row can be ensured.
In one embodiment, the pressing part 20 is only provided as one, the surface of the pressing part facing the battery array side is a pressing surface, optionally, the pressing surface is a flexible insulating material, a penetrating inner part is provided in the pressing part 20, the pressing part 20 can expand along with the injection of the fluid, flexibly adhere to the side part of each single cylindrical battery 30 on the battery array side, and evenly press; optionally, the compression surface is a rigid contact surface to accurately locate the specific location of each column of cells. Preferably, the pressurizing surface is attached to the housing pole of all the single cylindrical batteries 30 in the first row of the transverse battery row, preferably, the single cylindrical batteries 30 in the transverse battery row are connected in parallel, and the single cylindrical batteries 30 in the longitudinal battery row are connected in series; the pressurization face is laminated with horizontal battery row and pressurizes, in fact pressurizes for the series battery row to guarantee that the pressure between row battery bridge 40 is the same with the pressure between cylindrical battery 30 of monomer, for bringing higher electric connection stability between cylindrical battery 30 of monomer in the group, better contact resistance uniformity, and output balanced electric current after the battery is in groups.
Preferably, the pressurizing surface comprises N matching surfaces, each matching surface being used for applying pressure to a corresponding longitudinal cell row; the matching surface is a cylindrical surface matched with a shell pole of the single cylindrical battery 30 so as to ensure the balanced pressurization of the battery array; preferably, the pressure applied by the N mating surfaces to the corresponding longitudinal cell rows is the same in the case where the N mating surfaces have different expansion advance lengths. Preferably, in order to ensure that the matching surfaces can uniformly press the longitudinal cell rows, the height thereof is not less than half of the height of the single cylindrical battery 30.
It should be understood by those skilled in the art that when different specifications and different numbers of the single cylindrical batteries 30 are selected to form the array, the curvature and the number of the matching surfaces may be changed accordingly, and may be freely adjusted according to actual production requirements, which is not limited in the present embodiment.
In another embodiment, the pressure part 20 is provided as a set of: the utility model discloses a lateral battery row's of horizontal battery, including baffle, the baffle is located the pressurization portion 20 that is equipped with a plurality of linkages with same one side, every pressurization face of pressurization portion 20 all is equipped with one at least and the matching face of curvature looks adaptation of monomer cylindrical battery 30 casing utmost point post, the pressurization face of a plurality of linkages pressurization portion 20 corresponds the casing utmost point post of partial monomer cylindrical battery 30 in laminating the first row of horizontal battery row side by side respectively, all pressurization faces cover the casing utmost point post of all monomer cylindrical batteries 30 in the first row of horizontal battery row non-overlapping.
In another embodiment, two sets of the pressing portions 20 are provided, and the pressing surfaces thereof are respectively attached to the side portions of all the single cylindrical batteries 30 in the first row of the transverse battery row and the first column of the longitudinal battery row, wherein the first pressing portion 21 is attached to one side of the first row of the transverse battery row and presses the longitudinal battery row, the second pressing portion 22 is attached to one side of the first column of the longitudinal battery row and presses the transverse battery row, and the second pressing portion 22 may not be provided with an arc-shaped matching surface; alternatively, the first pressurizing part 21 and the second pressurizing part 22 may be provided in one, one set, or a combination thereof; preferably, the longitudinal cell columns pressed by the first pressing part 21 are electrically connected in series, and the transverse cell rows pressed by the second pressing part 22 are electrically connected in parallel; since the current in the series battery string is large and the current in the parallel battery string is small, it is more preferable that the pressure threshold value of the first pressurizing part 21 is larger than that of the second pressurizing part 22 to first ensure the uniformity of the contact resistance between the respective unit cylindrical batteries 30 in the series battery string.
In one embodiment, the pressurization part 20 is an inflatable air bag provided with a fluid passage, which can be filled with a pressurized gas and inflated, preferably air or an inert gas, to ensure safety during inflation.
In another embodiment, the pressurizing part 20 is an expandable liquid bag, which is also provided with a fluid passage, into which a pressurized liquid that is not easy to explode and solidify when pressurized at normal temperature can be poured, and preferably, the pressurized liquid is water or hydraulic oil.
Preferably, the pressurizing part 20 is further connected with a pressure display unit for displaying the pressure provided by the pressurizing part 20 to the battery array, and a pressure control unit for adjusting the pressure provided by the pressurizing part 20 to the battery array.
Preferably, the pressure control unit comprises a pressure detection module and a pressure application module; the pressure control unit is connected with the pressurizing part 20 and is used for controlling the volume, the speed and the pressure of the perfusion fluid in the pressurizing part 20; the pressure applying module is controlled by a set pressure threshold, the pressure detecting module detects that the pressure in the pressure applying part 20 reaches the pressure threshold, and the pressure applying module stops applying pressure to the pressure applying part 20 to ensure the pressure applying consistency of the battery arrays of multiple batches.
Example 2
Referring to fig. 1 to 4, the present embodiment provides a method of manufacturing a battery pack using the battery pack equalization pressurizing apparatus of embodiment 1, including:
1. sequentially placing a plurality of single cylindrical batteries 30 into the frame part 10 of the pressurizing device to form a rectangular battery array;
providing a plurality of upright single cylindrical batteries 30, arranging structural adhesive 60 on the bottom plate of the frame part 10, taking one corner of the frame part 10 as a starting point, putting the single cylindrical batteries 30 in sequence close to a baffle, and arranging the single cylindrical batteries 30 as a battery array;
2. structural adhesive 60 and/or an electric bridge 40 and/or cold welding adhesive and/or an insulating connecting piece are arranged between the side shell pole columns of the adjacent single cylindrical batteries in the battery array;
the top pole 31 of the adjacent single cylindrical battery 30 is connected with the shell pole in series through a cold welding process; it will be understood by those skilled in the art that the general term of the electrical connection structure of the cold welding process includes the cold welding glue disposed between the top terminal post 31 and the housing terminal post of the adjacent single cylindrical battery 30, and/or the electric bridge 40; preferably, the cold welding glue is a conductive glue which can be solidified at normal temperature; preferably, the bridge 40 is made of a conductive material; the cold welding glue is used for increasing the contact area of electric connection and stabilizing the electric flux of the electric connection point after being solidified; preferably, the connecting bridge 40 is made by bending sheet metal, and conductive adhesive is coated on the contact surface of the connecting bridge 40 and the housing pole;
preferably, the structural adhesive 60 is cured between the adjacent single cylindrical batteries 30, so that the stability and reliability of the serial connection electric connection and the stability and reliability of the serial battery row structure are maintained; the structural adhesive 60 is made of an insulating material, and can be used for making a gap between the side shells of the single cylindrical batteries 30, keeping the side shells of the adjacent single cylindrical batteries 30 parallel, and providing a certain buffer effect when the pressurizing part 20 expands;
preferably, the longitudinal battery rows in the battery array are connected in series, the transverse battery rows are connected in parallel, and the parallel electrical connection between the single cylindrical batteries 30 in the transverse battery rows is completed through the bus bar 50;
preferably, the longitudinal battery row includes a plurality of insulating connection parts for insulation between the unit cylindrical batteries 30 and/or between the electrical connection members, and for filling the ends of the longitudinal battery row in a staggered arrangement.
3. Placing the pressing part 20 into the frame part;
in one embodiment, only the first pressurizing portion 21 is provided for pressurizing the battery rows connected in series in the length direction thereof; in another embodiment, a first pressurizing part 21 and a second pressurizing part 22 are provided for pressurizing the battery arrays connected in series in rows and in parallel between rows, respectively;
4. injecting fluid into the pressurizing part 20;
as described in embodiment 1, the pressurizing portion 20 is an air bag or a liquid bag, and thus the corresponding pressurizing gas or pressurizing liquid is injected according to the actual type of the pressurizing portion 20;
5. the pressurizing part 20 pressurizes along the length direction of the serial battery rows and/or the parallel battery rows in the battery array to tightly press the battery array;
preferably, the pressure threshold of the first pressurizing part 21 is larger than the pressure threshold of the second pressurizing part 22, since the vertical battery column is in the direction of the series circuit, the contact resistance is required to be minimized, and the pressure is inversely proportional to the contact resistance, the pressure value of the first pressurizing part 21 is appropriately increased;
6. controlling the pressurizing part 20 to enable the pressures of the pressurizing part to different longitudinal battery columns and/or transverse battery rows to reach corresponding preset values;
adjusting the volume, the speed and the pressure of the fluid poured into the pressurizing part 20 through a pressure control unit, detecting whether the pressure in the pressurizing part 20 reaches a preset pressure value, if so, stopping pressing the pressurizing part 20 to ensure the pressurizing consistency of multi-batch battery arrays, further ensuring the same pressure and the same resistance between each electric bridge 40 and/or cold welding glue and the adjacent single cylindrical batteries 30, tightly squeezing the structural glue 60 between the single cylindrical batteries 30 at the moment and solidifying the electric bridge 40 and/or the cold welding glue and/or the insulating structural member;
7. releasing the pressure of the pressurizing part 20 and taking out the pressurizing part to obtain a battery pack;
at this time, the frame portion 10 and the battery array are combined to form a battery module; alternatively, the M frame portions 10 and the M battery arrays are combined into a battery module.
Through the process for preparing the battery pack in the embodiment, the following technical effects can be achieved:
1. putting the single cylindrical batteries into a box, and connecting the batteries in series and in parallel in the box to operate and implement integrally; the structure inside the battery array is integrated and the action of fixing the battery array on the bottom of the box at the same time is completed at one time; the battery array comprises a plurality of battery rows which are connected in series and in parallel, and the single cylindrical batteries in the battery array are uniformly pressurized through the expansion of a pressurizing part, so that the higher electric connection stability and the better contact resistance consistency of a plurality of electric connection points among the single cylindrical batteries in the battery array are ensured, and the uniform power supply of the single cylindrical batteries can be ensured after the batteries are grouped;
2. by utilizing the pressurizing equipment, the single cylindrical battery can be efficiently electrically connected and installed in the frame part of the pressurizing equipment, so that the production efficiency is improved.
3. By using the method, the frame part and the battery array are combined into the battery module for the new energy vehicle.
Example 3
This example provides a battery pack manufactured using the apparatus described in example 1 or a battery module manufactured using the method described in example 2.
As described in embodiment 2 above, the battery module includes a combination of the frame portion 10 and the battery array (and its internal electrical connections and insulators); preferably, the battery module includes a plurality of frame portions 10 in combination with a battery array.
While the present invention has been described with reference to the particular illustrative embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications, equivalent arrangements, and equivalents thereof, which may be made by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (23)
1. The battery pack equalizing and pressurizing device is characterized by comprising a frame part and a pressurizing part;
the frame part is used for accommodating a battery array formed by longitudinally and transversely arranging a plurality of upright single cylindrical batteries, the battery array comprises N longitudinal battery rows which are arranged in parallel, and N is more than or equal to 2; the frame part comprises a baffle plate surrounded at the periphery, and the height of the baffle plate is not less than half of the height of the single cylindrical battery;
the pressurizing part is at least arranged between the baffle and one side of the battery array, the surface of the pressurizing part facing one side of the battery array is a pressurizing surface, the pressurizing surface comprises a flexible material, the pressurizing surface comprises N matching surfaces, and each matching surface is used for applying pressure to the corresponding longitudinal battery column; the matching surface comprises a cylindrical surface matched with the single cylindrical battery shell pole; the pressurization part is provided with a through inner part and can be pressurized and expanded along with the injection of fluid into the pressurization part, so that N matching surfaces of the pressurization part are respectively abutted and pressed on N longitudinal battery rows in a self-adaptive manner, and the pressures applied to the corresponding longitudinal battery rows by the N matching surfaces are the same under the condition that the N matching surfaces have different expansion advancing lengths.
2. The battery pack equalization pressurizing apparatus of claim 1, wherein the height of the mating surface is not less than half of the height of the single cylindrical battery side housing post.
3. The battery pack equalizing and pressurizing device of claim 1, wherein the pressurizing surface is attached to the housing posts of all the single cylindrical batteries in the first row of transverse battery rows.
4. The battery pack equalization pressurization device of claim 1, wherein the mating surface is a cylindrical surface that mates with the single cylindrical battery housing post.
5. The battery pack equalization pressurization device of claim 1, wherein the mating face has a rigid contact face.
6. The battery pack equalizing and pressurizing device according to claim 1, wherein a plurality of linked pressurizing parts are arranged on the same side of the baffle, the pressurizing surfaces of the linked pressurizing parts are respectively attached to part of the housing poles of the single cylindrical batteries in the first row of transverse battery rows side by side, and all the pressurizing surfaces cover all the housing poles of the single cylindrical batteries in the first row of transverse battery rows without overlapping; the pressures in the plurality of linked pressurizing portions are equal.
7. The battery pack equalization pressurization device of claim 1, wherein the frame portion comprises a closed, stable rectangular frame surrounded by the baffles.
8. The battery pack balanced pressurization device according to claim 1, characterized in that the inner side surface of the baffle is provided with an elastic insulating shock-resistant flame-retardant material.
9. The battery pack equalization pressurization device of claim 1, wherein the frame portion is a battery pack housing or is a portion of a battery pack housing.
10. The battery pack equalization pressurization device of claim 9, wherein a plurality of identical frame portions are included in the battery pack housing.
11. The battery pack equalization pressurization device of claim 1, wherein the pressurization portion comprises an inflatable bladder or liquid bladder.
12. The battery pack equalization pressurization device of claim 11, wherein the pressurization portion has a fluid channel.
13. The battery pack equalization pressurization device according to claim 1, characterized in that the pressurization part comprises a first pressurization part capable of pressurizing a vertical battery column and a second pressurization part capable of pressurizing a horizontal battery row.
14. The battery pack equalization pressurization device of claim 13, wherein in the battery array, the longitudinal battery columns are electrically connected in series; the transverse cell rows are electrically connected in parallel.
15. The battery pack equalization pressurizing apparatus of claim 14, wherein the pressure threshold of the first pressurizing portion is larger than the pressure threshold of the second pressurizing portion.
16. The battery pack equalizing and pressurizing device of claim 1, further comprising a pressure control unit, wherein the pressure control unit comprises a pressure detecting module and a pressurizing module; the pressure control unit is connected with the pressurizing part and is used for controlling the volume, the speed and the pressure of the fluid filled into the pressurizing part; the pressure applying module is limited by a set pressure threshold, the pressure detecting module detects that the pressure in the pressure applying part reaches the pressure threshold, and the pressure applying module stops applying pressure to the pressure applying part to ensure the pressure applying consistency of the battery arrays of multiple batches.
17. The battery pack equalizing and pressurizing device according to claim 16, further comprising a pressure display unit, wherein the pressure display unit is respectively connected to the pressure control unit and the pressurizing part and is used for displaying the pressure provided by the pressurizing part to the battery array.
18. A method of manufacturing a battery using the battery equalization pressurization device of any of claims 1-17, comprising:
sequentially placing a plurality of single cylindrical batteries into a frame part of a pressurizing device to form a rectangular battery array;
structural adhesive and/or electric bridges and/or cold welding adhesive and/or insulating connecting pieces are arranged between side shell pole columns of adjacent single cylindrical batteries in the battery array;
placing the pressurizing part into the frame part;
injecting fluid into the pressurizing part;
the pressurizing part pressurizes along the length direction of a longitudinal battery row and/or a transverse battery row in the battery array to tightly press the battery array;
controlling the pressurizing part to enable the pressure of the pressurizing part on different longitudinal battery columns and/or transverse battery rows to reach corresponding preset values;
after the battery array is pressurized, the structural adhesive arranged between the single cylindrical batteries is mutually compacted and integrally cured;
the pressurizing part was released and taken out to obtain a battery pack.
19. The method of claim 18, wherein the longitudinal cell columns are rows of series cells; the lateral cell rows are parallel connected cell rows.
20. The method of claim 18, wherein the bridge and/or cold solder is cured after the battery pack is pressurized.
21. The method of claim 18, wherein the longitudinal battery column includes a plurality of insulation connecting portions for insulation between the unit cylindrical batteries and/or between the electrical connectors, and for filling ends of the longitudinal battery column in the misaligned arrangement.
22. The method of claim 18, wherein the frame portion and the battery array are combined into a battery module;
or the M frame parts and the M battery arrays are combined into a battery module, and M is more than or equal to 2.
23. A battery module produced by the method of claim 18, wherein the battery module comprises a combination of at least one frame portion and a battery array.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210357194.5A CN114497870B (en) | 2022-04-07 | 2022-04-07 | Battery pack balanced pressurization equipment, battery pack preparation method and battery module |
| JP2023062011A JP7330586B1 (en) | 2022-04-07 | 2023-04-06 | Assembled battery equal pressure device, assembled battery manufacturing method, and battery module |
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| CN202210357194.5A CN114497870B (en) | 2022-04-07 | 2022-04-07 | Battery pack balanced pressurization equipment, battery pack preparation method and battery module |
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| CN114497870A CN114497870A (en) | 2022-05-13 |
| CN114497870B true CN114497870B (en) | 2022-11-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2012129009A (en) | 2010-12-14 | 2012-07-05 | Nissan Motor Co Ltd | Battery pack |
| DE102014225367A1 (en) * | 2014-12-10 | 2016-06-16 | Robert Bosch Gmbh | Battery and method of manufacturing a battery |
| US10062882B2 (en) * | 2015-10-16 | 2018-08-28 | Bosch Battery Systems Llc | Force generating assembly for a battery pack |
| BR112019016360A2 (en) | 2017-02-08 | 2020-04-07 | Elkem Silicones Usa Corp | secondary battery pack and process for preparing a secondary battery pack |
| CN107331820B (en) * | 2017-08-23 | 2023-06-20 | 华霆（合肥）动力技术有限公司 | Welding-free battery module and welding-free battery module system |
| DE102018204220A1 (en) * | 2018-03-20 | 2019-09-26 | Volkswagen Aktiengesellschaft | battery |
| WO2020031467A1 (en) | 2018-08-06 | 2020-02-13 | 株式会社村田製作所 | Battery holder, battery pack, electronic device and electric vehicle |
| KR20210016827A (en) * | 2019-08-05 | 2021-02-17 | 주식회사 엘지화학 | Battery Module Having A Plurality of Cylindrical Battery Cells, Battery Pack and Vehicle Including the Same |
| JPWO2021132222A1 (en) | 2019-12-27 | 2021-07-01 | ||
| JP7400545B2 (en) | 2020-03-02 | 2023-12-19 | トヨタ自動車株式会社 | Battery module and battery module manufacturing method |
| EP3886202A1 (en) | 2020-03-27 | 2021-09-29 | Samsung SDI Co., Ltd. | Fluid spring pressurized battery stack |
| JP2022140014A (en) | 2021-03-12 | 2022-09-26 | トヨタ自動車株式会社 | Battery pack device |
| CN214706146U (en) * | 2021-10-18 | 2021-11-12 | 嘉兴模度新能源有限公司 | Self-tightening type battery pack and battery pack |
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| JP2023155208A (en) | 2023-10-20 |
| CN114497870A (en) | 2022-05-13 |
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Address after: No. 182, Pujiaqiao Community, Yangqiao Village, Dayun Town, Jiashan County, Jiaxing City, Zhejiang Province, 314100 Patentee after: Jiaxing modu new energy Co.,Ltd. Patentee after: SUZHOU MODU INTELLIGENT TECHNOLOGY Co.,Ltd. Address before: 314100 Room 302, building A3, 555 Chuangye Road, Dayun Town, Jiashan County, Jiaxing City, Zhejiang Province Patentee before: Jiaxing modu new energy Co.,Ltd. Patentee before: SUZHOU MODU INTELLIGENT TECHNOLOGY Co.,Ltd. |