EP3826882A1 - Battery pack - Google Patents

Battery pack

Info

Publication number
EP3826882A1
EP3826882A1 EP19762213.7A EP19762213A EP3826882A1 EP 3826882 A1 EP3826882 A1 EP 3826882A1 EP 19762213 A EP19762213 A EP 19762213A EP 3826882 A1 EP3826882 A1 EP 3826882A1
Authority
EP
European Patent Office
Prior art keywords
batteries
battery pack
plate
electrodes
plates
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19762213.7A
Other languages
German (de)
French (fr)
Inventor
Mauro Fantin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TEXA SpA
Original Assignee
TEXA SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by TEXA SpA filed Critical TEXA SpA
Publication of EP3826882A1 publication Critical patent/EP3826882A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
    • 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
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6553—Terminals or leads
    • 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
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/505—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising a single busbar
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
    • H01M50/512—Connection only in parallel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/545—Temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the present invention refers generically to a battery pack, in particular for powering an electric vehicle such as a car.
  • a car battery pack consists of a group of many cells connected in series and parallel, to have adequate output voltage and power, and of an electronic board that manages the power flow.
  • the cells are fixed to a support grid, and in groups connected in series or parallel by conductive plates.
  • the batteries In high performance vehicles the batteries often need to be cooled after and/or during high energy outputs. Likewise, the batteries must be heated for vehicles placed in too cold environments.
  • Every cell is a small cylinder actually formed by a continuous sheet spirally rolled up on itself, where two opposite edges of the sheet represent the electrodes of opposite sign of the cell.
  • the heat exchange occurs only with a small portion of the sheet, that corresponding to the outer part of the cell, because such portion shields the whole remaining internal area.
  • the cell is cooled or heated poorly and very little uniformly.
  • the main object of the invention is to improve this state of the art.
  • Another object is to provide a battery pack in which the heat exchange with the cells is better.
  • Another object is to make a battery pack that is simple to build.
  • Another aspect of the invention concerns a vehicle, in particular an electric vehicle, in particular a car, equipped with the aforementioned battery pack in one or each of the variants defined here.
  • the battery pack comprises:
  • a plate e.g. flat
  • electrically conductive material which is mounted lying on said plane to connect together the surface electrodes of equal polarity of the plurality of batteries, and is
  • the aforesaid plate heat is removed (brought) from (to) the batteries starting from an end thereof.
  • the advantage is accentuated for batteries formed by a continuous sheet rolled up as a spiral on itself, where for example two opposite edges of the sheet represent the electrodes of opposite sign of the battery.
  • the heat exchange with the aforesaid plate can occur along the entire length of an edge of the rolled up sheet, including also the central part of the battery.
  • the cells are fixed to a support grid, and in groups connected in series or parallel by conductive plates.
  • the battery pack comprises:
  • a (e.g. flat) plate made of electrically conductive material which is
  • the battery pack comprises two plates, one for each electric pole, which are respectively installed lying on each of the planes.
  • the batteries can have any shape, e.g. cylindrical or prismatic or flattened.
  • the plates can be shaped to connect the poles, which in the case of a prismatic or flat battery are often only on one side.
  • one or each plate is formed by two sheets coupled on one another and separated only in correspondence of a continuous interspace that forms said channel.
  • a plate comprises a surface convexity (obtained e.g. by drawing) which is directed towards the plurality of batteries.
  • the convexity has preferably an extension approximately about equal to the end area of a battery.
  • the two said convexities are at the ends of a segment orthogonal to said planes.
  • a battery can be mounted between the two convexities.
  • one or each plate comprises at least two of said channels, each equipped with a path isolated from that of the other channel and e.g. equipped with an inlet and outlet distinct from each other and from those of the other path.
  • a path isolated from that of the other channel e.g. equipped with an inlet and outlet distinct from each other and from those of the other path.
  • the at least two of said channels are distributed to uniformly cover the surface of the plate, to maximize the heat exchange.
  • the inlets and outlets of the channels of a plate are all shunt-connected to tap from a single fluid-collecting circuit.
  • the battery pack comprises in a variant
  • Another aspect of the invention concerns a method for making a battery pack formed by a plurality of batteries which
  • each has the superficial electrode lying on a same imaginary plane
  • the batteries have electrodes of opposite electrical polarity respectively exposed at diametrically opposite ends, and are arranged side by side so as to have the homologous poles on two imaginary parallel planes.
  • the method comprises the steps of sandwiching the plurality of batteries between two flat plates made of electrically conductive material, so that a plate lies on each of said planes for connecting together the homologous poles of the plurality of batteries, wherein each plate is equipped with at least one internal channel in which fluid adapted for thermal exchange with batteries can flow.
  • the used fluid is preferably a liquid with electrically insulating features (e.g. 3MTM NovecTM Engineered Fluids).
  • FIG. 1 shows a partial side view of the battery pack
  • FIG. 1 shows a plan view of the battery pack.
  • the battery pack 10 comprises a plurality of batteries 12, e.g. of cylindrical shape, which have electrodes 14, 16 of opposite electrical polarity (+, -) respectively exposed at diametrically opposite ends.
  • the batteries 12 are preferably of equal length, and are arranged side by side so as to have all the homologues poles 12, 14 lying on two imaginary parallel planes PI, P2. So all the + poles of the plurality of batteries 12 are e.g. above in fig. 1, while the - poles are at the bottom in fig. 1.
  • a flat plate 30 made of electrically conductive material is mounted lying on each of said imaginary planes PI, P2 for connecting together the homologous poles 14, 16 of a plurality of batteries 12.
  • the batteries 12 are connected in parallel with each other by the plates 30.
  • each plate 30 is provided with at least one internal channel 36 to make fluid suitable for heat exchange with the batteries 12 flow therein.
  • the number of channels 36 for each plate 30 can vary, and be thickened according to need.
  • each channel 36 has a path that does not intersect with that of another channel 36, so as not to mix the heat exchange fluid and maximize the heat exchange.
  • the plate 30 is formed by two laminae 32, 34 coupled to one another and separated only in correspondence of a continuous interspace forming said channel 36.
  • one or each of the two laminae 32, 34 is raised and curves locally with respect to the other to create the space of the channel 36.
  • the plate 30 comprises a surface convexity 38 (obtained for example by drawing) which is directed towards the batteries 12.
  • the convexity 38 has an area approximately equal to the end area of a battery 12, and serves as an improved support point on the plate 30 for a battery 12.
  • each plate 30 has a convexity 38 at the same point, in particular placed at the ends of a segment or X axis orthogonal to said planes.
  • segment or X-axis When the segment or X-axis is "occupied" by a battery 12, it contacts the plates 30 through two aligned and facing convexities 38.
  • each plate 30 has a plurality of channels 36 and distributed on the surface of the plate 30 to tile it uniformly.
  • the channels 36 form a coil.
  • fig. 1 allows to easily connect in parallel and/or in series several plates 30, in order to increase the voltage or amperage of the total equivalent battery. Or, with plates 30 always coplanar, it is just enough to reverse the orientation of the batteries 12.
  • the inlets 42 and the outlets 44 of the channels 36 of a plate 30 are all connected to tap from one single fluid-collecting circuit 50, see Fig. 2, formed by two conduits 52, 54 of fluid, delivery and return.
  • the circulating fluid that interacts with the batteries 12 travels shorter channels, and the overall system is simpler.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

A battery pack (10) is described comprising a plurality of batteries (12) which have an exposed superficial electrode (14, 16), and are arranged side by side in such a way that the exposed electrode of each lies on an imaginary plane (P1, P2). To improve the heat exchange, a plate (30) made of an electrically conductive material is mounted lying on said plane (P1, P2) to connect the electrodes of the plurality of batteries (12) together (14, 16), and is provided with at least one inner channel (36) in which fluid adapted for thermal exchange with the batteries (12) can flow.

Description

BATTERY PACK
The present invention refers generically to a battery pack, in particular for powering an electric vehicle such as a car.
Generally a car battery pack consists of a group of many cells connected in series and parallel, to have adequate output voltage and power, and of an electronic board that manages the power flow. The cells are fixed to a support grid, and in groups connected in series or parallel by conductive plates.
In high performance vehicles the batteries often need to be cooled after and/or during high energy outputs. Likewise, the batteries must be heated for vehicles placed in too cold environments.
To this aim, then, between the cells of the battery pack runs a circuit carrying cooling or heating fluid which touches the outer surface of the cells. Every cell is a small cylinder actually formed by a continuous sheet spirally rolled up on itself, where two opposite edges of the sheet represent the electrodes of opposite sign of the cell. Thus, the heat exchange occurs only with a small portion of the sheet, that corresponding to the outer part of the cell, because such portion shields the whole remaining internal area.
In sum, the cell is cooled or heated poorly and very little uniformly.
The main object of the invention is to improve this state of the art.
Another object is to provide a battery pack in which the heat exchange with the cells is better.
Another object is to make a battery pack that is simple to build.
These and other objects are achieved by a battery pack and method, according to claims 1 and 10; other advantageous technical characteristics are defined in the dependent claims.
Another aspect of the invention concerns a vehicle, in particular an electric vehicle, in particular a car, equipped with the aforementioned battery pack in one or each of the variants defined here.
The battery pack comprises:
a plurality of batteries which
have an exposed superficial electrode, and
are arranged side by side so that the exposed superficial electrode of each lies on an imaginary plane, and a plate (e.g. flat) made of electrically conductive material which is mounted lying on said plane to connect together the surface electrodes of equal polarity of the plurality of batteries, and is
provided with at least one internal channel in which fluid adapted to thermal exchange with the batteries can flow.
Thanks to the aforesaid plate, heat is removed (brought) from (to) the batteries starting from an end thereof. The advantage is accentuated for batteries formed by a continuous sheet rolled up as a spiral on itself, where for example two opposite edges of the sheet represent the electrodes of opposite sign of the battery. Thus, the heat exchange with the aforesaid plate can occur along the entire length of an edge of the rolled up sheet, including also the central part of the battery.
The advantage holds for a generic battery pack, which is usually composed of a group of many battery cells connected in series and parallel, to have adequate output voltage and power. The cells are fixed to a support grid, and in groups connected in series or parallel by conductive plates.
In particular, the battery pack comprises:
a plurality of batteries which
have electrodes of opposite electrical polarity respectively exposed at diametrically opposite ends, and
are arranged side by side so as to have the homologous (of equal polarity) poles/ electrodes on two imaginary parallel planes, and
a (e.g. flat) plate made of electrically conductive material which is
mounted lying on one of said planes to connect together the homologous poles, and is
equipped with at least one internal channel in which fluid adapted for heat exchange with the batteries can flow.
Preferably the battery pack comprises two plates, one for each electric pole, which are respectively installed lying on each of the planes.
The batteries can have any shape, e.g. cylindrical or prismatic or flattened.
The plates can be shaped to connect the poles, which in the case of a prismatic or flat battery are often only on one side. For ease of construction, preferably one or each plate is formed by two sheets coupled on one another and separated only in correspondence of a continuous interspace that forms said channel.
For ease of assembly, a plate comprises a surface convexity (obtained e.g. by drawing) which is directed towards the plurality of batteries. The convexity has preferably an extension approximately about equal to the end area of a battery.
In particular, there are two said convexities, one per plate and at the same point. Even more particularly, the two said convexities are at the ends of a segment orthogonal to said planes. Thus a battery can be mounted between the two convexities.
Preferably one or each plate comprises at least two of said channels, each equipped with a path isolated from that of the other channel and e.g. equipped with an inlet and outlet distinct from each other and from those of the other path. Thus it is possible to optimize the heat exchange between the plate and the batteries, e.g. by circulating fluid in the paths with counter-current flow pattern.
Preferably the at least two of said channels are distributed to uniformly cover the surface of the plate, to maximize the heat exchange.
To simplify the circuit of fluid, the inlets and outlets of the channels of a plate are all shunt-connected to tap from a single fluid-collecting circuit.
To generate different voltages, dictated by the specific application, the battery pack comprises in a variant
two or more modules each formed by two said parallel plates between which and to which a plurality of batteries is electrically connected,
wherein the plates of the modules are electrically connected together in series or parallel.
Another aspect of the invention concerns a method for making a battery pack formed by a plurality of batteries which
have an exposed superficial electrode, and
are arranged side by side so that each has the superficial electrode lying on a same imaginary plane,
with the steps of
connecting said electrodes with a (for example flat) plate made of electrically conducting material, so that the plate lies on said plane to connect together said electrodes of the battery, wherein the plate is provided with at least one internal channel in which a fluid adapted for thermal exchange with the batteries can flow or flows.
As a variant, in the method the batteries have electrodes of opposite electrical polarity respectively exposed at diametrically opposite ends, and are arranged side by side so as to have the homologous poles on two imaginary parallel planes. The method comprises the steps of sandwiching the plurality of batteries between two flat plates made of electrically conductive material, so that a plate lies on each of said planes for connecting together the homologous poles of the plurality of batteries, wherein each plate is equipped with at least one internal channel in which fluid adapted for thermal exchange with batteries can flow.
To avoid a short circuit induced by the coolant liquid (for example, water or water/glycol) circulating between plates at different voltages, e.g. in the case of plates connected in series, the used fluid is preferably a liquid with electrically insulating features (e.g. 3M™ Novec™ Engineered Fluids).
Further advantages will be clear from the following description, which refers to a preferred embodiment of a battery pack in which:
- figure 1 shows a partial side view of the battery pack;
- figure 2 shows a plan view of the battery pack.
The battery pack 10 comprises a plurality of batteries 12, e.g. of cylindrical shape, which have electrodes 14, 16 of opposite electrical polarity (+, -) respectively exposed at diametrically opposite ends. The batteries 12 are preferably of equal length, and are arranged side by side so as to have all the homologues poles 12, 14 lying on two imaginary parallel planes PI, P2. So all the + poles of the plurality of batteries 12 are e.g. above in fig. 1, while the - poles are at the bottom in fig. 1.
A flat plate 30 made of electrically conductive material is mounted lying on each of said imaginary planes PI, P2 for connecting together the homologous poles 14, 16 of a plurality of batteries 12. Thus, the batteries 12 are connected in parallel with each other by the plates 30. There can also be a single plate 30 for only one side of the batteries 30.
One or each plate 30 is provided with at least one internal channel 36 to make fluid suitable for heat exchange with the batteries 12 flow therein. The number of channels 36 for each plate 30 can vary, and be thickened according to need. Preferably each channel 36 has a path that does not intersect with that of another channel 36, so as not to mix the heat exchange fluid and maximize the heat exchange. For the same purpose, it is preferred to equip each channel 36 with an inlet and outlet different from those of any other adjacent channel.
It is then understood from fig. 1 that the circulation of fluid (e.g. coolant liquid) in the channels 36 allows a high heat exchange with all the battery 12, which gives up or absorbs heat along the geometric axis that joins the electrodes. Above all, the battery 12 gives up or absorbs heat even from the center, which in this configuration "sees" the same thermal impedance as the edges.
According to a preferred embodiment, the plate 30 is formed by two laminae 32, 34 coupled to one another and separated only in correspondence of a continuous interspace forming said channel 36. Actually, one or each of the two laminae 32, 34 is raised and curves locally with respect to the other to create the space of the channel 36.
According to a preferred embodiment, the plate 30 comprises a surface convexity 38 (obtained for example by drawing) which is directed towards the batteries 12. The convexity 38 has an area approximately equal to the end area of a battery 12, and serves as an improved support point on the plate 30 for a battery 12.
Preferably, each plate 30 has a convexity 38 at the same point, in particular placed at the ends of a segment or X axis orthogonal to said planes. When the segment or X-axis is "occupied" by a battery 12, it contacts the plates 30 through two aligned and facing convexities 38.
To improve the efficiency of the fluid circulating in the heating and / or cooling circuit, each plate 30 has a plurality of channels 36 and distributed on the surface of the plate 30 to tile it uniformly. E.g. the channels 36 form a coil.
The structure of fig. 1 allows to easily connect in parallel and/or in series several plates 30, in order to increase the voltage or amperage of the total equivalent battery. Or, with plates 30 always coplanar, it is just enough to reverse the orientation of the batteries 12.
See e.g. in fig. 2 the planar arrangement of various plates 30 connected electrically together by common portions 80.
To maximize the efficiency of the heat exchange, preferably the inlets 42 and the outlets 44 of the channels 36 of a plate 30 are all connected to tap from one single fluid-collecting circuit 50, see Fig. 2, formed by two conduits 52, 54 of fluid, delivery and return. Thus the circulating fluid that interacts with the batteries 12 travels shorter channels, and the overall system is simpler.

Claims

1. Battery pack ( 10) comprising:
- a plurality of batteries ( 12) which have an exposed superficial electrode ( 14, 16), and are arranged side by side in such a way that the exposed electrode of each lies on an imaginary plane (PI, P2), and
- a plate (30) made of an electrically conductive material which is mounted lying on said plane (PI, P2) to connect the electrodes of the plurality of batteries ( 12) together ( 14, 16), and
provided with at least one inner channel (36) in which fluid adapted for thermal exchange with the batteries ( 12) can flow.
2. Battery pack ( 10) according to claim 1, wherein the batteries have superficial electrodes ( 14, 16) of opposite electrical polarity respectively exposed at diametrically opposite ends, and
are arranged side by side so as to have electrodes of equal polarity on two imaginary parallel planes (PI, P2),
the battery pack comprising a plate (30) of electrically conductive material that is mounted lying on one of said planes to connect the electrodes of equal polarity together, and is equipped with at least one inner channel (36) in which fluid for thermal exchange with the batteries can flow.
3. Battery pack ( 10) according to claim 2, comprising two said plates (30), one for each polarity of electrodes of equal polarity, which are mounted lying respectively on each of said planes (PI, P2).
4. Battery pack ( 10) according to any one of the previous claims, wherein a or each plate (30) is formed by two plates (32, 34) coupled to one another and separated only in correspondence of a continuous interspace which forms said channel (36).
5. Battery pack ( 10) according to any one of the previous claims, wherein a or each plate (30) comprises a surface convexity (38) which is directed towards the plurality of batteries and has an extension equal to approximately the end area of a battery ( 12).
6. Battery pack ( 10) according to claim 5, comprising two said convexities (38), one per plate, which are at the ends of a segment (X) orthogonal to said planes.
7. Battery pack ( 10) according to any one of the previous claims, wherein a or each plate (30) comprises at least two of said channels (36), each provided with a path isolated from that of the other channel and provided with an inlet and outlet distinct from each other and from those of the other path.
8. Battery pack ( 10) according to claim 7, wherein the at least two of said channels are distributed to uniformly cover the surface of the plate.
9. Battery pack ( 10) according to any one of the previous claims, comprising; two or more modules each formed by two of said parallel plates (30), between which an to which a plurality of batteries ( 12) is electrically connected, wherein the plates of the modules are electrically connected together in series or parallel.
10. Method for making a battery pack ( 10) formed by a plurality of batteries ( 12) which have an exposed superficial electrode ( 14, 16), and are arranged side by side so that each has the superficial electrode lying on a same imaginary plane (PI, P2), with the steps of
connecting the electrodes among each other by a plate (30) made of electrically conductive material, so that the plate lies on said plane to connect the electrodes of the batteries together,
wherein the plate is provided with at least one inner channel (36) in which fluid for thermal exchange with the batteries can flow or flows.
EP19762213.7A 2018-07-23 2019-07-18 Battery pack Withdrawn EP3826882A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102018000007413A IT201800007413A1 (en) 2018-07-23 2018-07-23 "BATTERY PACK"
PCT/IB2019/056147 WO2020021405A1 (en) 2018-07-23 2019-07-18 Battery pack

Publications (1)

Publication Number Publication Date
EP3826882A1 true EP3826882A1 (en) 2021-06-02

Family

ID=63834567

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19762213.7A Withdrawn EP3826882A1 (en) 2018-07-23 2019-07-18 Battery pack

Country Status (3)

Country Link
EP (1) EP3826882A1 (en)
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