Electric battery module pack

Abstract

Pack of electric storage modules Pack (6) of electric storage modules (8) comprising: - several electric storage modules (8), each comprising: two stacks (9) of electric storage cells, each comprising: two end plates (10, 11), a plurality of electric storage cells arranged in at least one row between the two end plates, a heat exchanger plate (13) disposed between the two stacks (9) and in thermal contact therewith, the plate (13) extending beyond the two stacks by an end end (14) at the rear of the module, the modules (8) being aligned laterally, - a terminal box (15), disposed on the end plates (10) located at the front of the modules, - one or more mounting bars (16), connecting the modules (8) together, the mounting bar(s) (16) being fixed to the heat exchanger plate (13) of each module (8) at the final end (14) of the plate.Figure for the summary: Fig 3.

Description

Title of the invention: Electric battery module pack technical field

[0001] The present invention relates to electrical energy storage devices comprising rows of accumulator modules, and more particularly but not exclusively to containerized stationary storage devices.

[0002] The invention also relates to an electrical accumulator module used in such storage devices, as well as a stack of electrical accumulator cells constituting the module, an electrical energy storage assembly enabling the stack to be formed, a bus bar, an interconnection assembly, and finally a pack comprising several modules. Previous technique

[0003] The development of intermittent renewable energies such as photovoltaic or wind energy is accompanied by the need to benefit from stationary storage devices that allow energy to be stored during production periods and released outside of these periods.

[0004] To meet this need, storage devices have been proposed comprising maritime standard containers, in which racks of accumulator modules, a cold production system and a power conversion system are arranged.

[0005] The racks are most often made from modules identical to those developed for the automotive industry, and have chassis onto which the modules are inserted, spaced vertically apart from each other.

[0006] Modules developed for the automotive industry are generally complex, as the mechanical structure used to hold the cells must withstand the vibrations and accelerations encountered in a vehicle. However, strengthening the mechanical structure of these modules comes at the expense of storage capacity.

[0007] Furthermore, during the use of the module, the electrical storage cells contained within the module swell and deform. These deformations cause pressures inside the module, which can lead to further expansion and thus reduce its lifespan. The lifespan of the storage cells is indeed dependent on their proper compression.

[0008] Application WO 2021 / 135955 relates to an electrical storage module comprising a row of prismatic storage cells arranged between two end plates held tightly together by a metal band and a plastic band, which can be overlapped to form an overall cable. The choice of two bands of Using different materials with different tensile strengths and moduli of elasticity improves the reliability of connections within the cell arrangement while managing internal pressures in the module due to cell aging.

[0009] WO 2021 / 052005 describes an electrical storage module comprising a row of prismatic storage cells arranged between two end plates and side plates held together by bands. The interlocking of the plates and their arrangement allow for the release of internal pressures within the module during its use.

[0010] Beyond the problems of compressing the modules, the connection of the accumulator cells, in particular pocket-type cells, to each other is the subject of much research in order to succeed in gaining compactness and energy density while ensuring a good connection of the cells.

[0011] US patent application 2019 / 0097201 proposes welding together the electrical connection tabs attached to oppositely polarized electrodes of two adjacent pocket-type cells to form series-connected elementary battery units. These battery units are then connected in series within the module.

[0012] There is therefore an interest in increasing the storage capacity embedded in electrical energy storage containers, facilitating their manufacture and maintenance, and improving their safety and reliability. There are still needs to ensure proper cell connection within the modules, facilitate their assembly, and guarantee a long service life.

[0013] The invention aims to meet all or part of these needs. Summary of the invention Electrical energy storage system

[0014] According to a first aspect, the invention relates to an electrical energy storage system comprising: - a plurality of pocket-type electrical storage cells, each pocket-type cell comprising:

[0015] - a cathode and an anode enclosed in a pocket, - a cathode ray pin for electrical connection, electrically coupled to the cathode, and - an anodic electrical connection leg electrically coupled to the anode, the anodic and cathodic electrical connection legs protruding from the pocket,

[0016] - a cathodic connector and an anodic connector for paralleling the cells of the plurality of cells in the set, the cathodic and anodic connectors each having at least one flattened portion, the cathode legs being folded each over the cathode connector and the anodic legs being folded each over the anodic connector, so as to electrically connect the cathodes of the pocket-type cells on one side and the anodes of the pocket-type cells on the other.

[0017] By "electrical accumulator cell", we mean an electrical energy storage cell.

[0018] By "pocket-type," it is understood that the pocket-type cell of the assembly according to the invention corresponds to a cell designated as a "pouch" in English, its shape being reminiscent of a pocket or a sachet. A pocket-type cell may comprise an anode, a cathode, a permeable membrane separating the anode and the cathode, and a pouch.

[0019] The bag can take the form of a bag closed all around except for one or two slits through which the anodic and cathodic connection tabs, respectively electrically coupled to the anode and cathode, protrude from the bag.

[0020] By "enclosed in a pocket", it is meant that the pocket completely surrounds the anode and the cathode except for the slots allowing the passage of the cathodic and anodic electrical connection pins.

[0021] The pouch can be flexible. The pouch can take the form of a film.

[0022] The pocket can be made at least partially, in particular partially, by Electrically conductive material, particularly metal such as aluminum. The pouch may have an insulating lining.

[0023] The electrical accumulator cells of the assembly can use any type of technology, for example Lithium ion, Lithium polymer, Lithium iron phosphate, Lithium metal polymer or Lithium air, among other Lithium-based technologies; the cells can alternatively use other accumulator technologies, other than Lithium-based.

[0024] The assembly may comprise between 1 and 20 pocket-type cells, preferably between 2 and 10 pocket-type cells, for example four.

[0025] The assembly may comprise an even number of pocket-type cells, for example two or four. Alternatively, the assembly may comprise an odd number of pocket-type cells.

[0026] Pocket-type cells may have two opposite principal faces joined by a slice. Pocket-type cells may have a generally parallelepiped shape, in particular a rectangular parallelepiped shape.

[0027] The main faces of pocket-type cells have a length L, which can be between 400 mm and 600 mm, or even between 450 mm and 550 mm, preferably between 500 mm and 550 mm, for example 514 mm. The length of the face is understood to be principal is the largest dimension of the main face.

[0028] The main faces of the pocket-type cells have a width 1, which can be between 30 mm and 40 mm, or even between 35 mm and 40 mm, for example 35.5 mm. Width is understood to mean the smallest dimension of the main faces.

[0029] The edge of pocket-type cells can have a low thickness, for example a thickness between 5 and 20 mm, or even between 7 mm and 18 mm, better between 10 mm and 17 mm, for example 16.11 mm.

[0030] Pocket-type cells can thus be flattened. The flattening plane of a pocket-type cell can be defined. The flattening plane is parallel to the principal faces of said cell and intersects the cell's edge so as to potentially form a plane of symmetry for the cell.

[0031] The slice of pocket-type cells has two large opposite faces and two small opposite faces.

[0032] By "electrical connection tab", we mean a tab protruding through a slot in the pocket formed by the pocket-type cell and acting as a terminal of the cell.

[0033] The electrical connection tabs may be substantially rectangular in shape before folding. Alternatively, they may have a different shape.

[0034] The two electrical connection tabs may be of different thickness, width and length. Alternatively, they may have the same dimensions.

[0035] The cathode electrical connection legs can have a length Lpc between 20 mm and 40 mm, better between 30 mm and 40 mm, for example 35 mm.

[0036] The cathode electrical connection lugs can have a width lpc between 20 mm and 30 mm, for example 26 mm.

[0037] The cathode electrical connection lugs can have a very small thickness epc, for example between 0.2 mm and 0.5 mm, for example 0.3 mm.

[0038] The anodic electrical connection lugs can have a length Lpa between 30 mm and 50 mm, or even between 40 mm and 50 mm, for example 45 mm.

[0039] The anode electrical connection lugs can have a width lpa between 20 mm and 30 mm, for example 26 mm.

[0040] The anodic electrical connection lugs can have a very low thickness epa, for example between 0.2 mm and 0.5 mm, for example 0.4 mm.

[0041] The very low thickness of the electrical connection tabs makes it easier to bend them onto the parallel connection connectors.

[0042] The cathode electrical connection lugs may be made of an electrically conductive material, in particular a metal, for example copper. The cathode electrical connection lugs may be nickel-coated.

[0043] The cathode electrical connection pins of the various pocket-type cells The components of the assembly according to the invention may be made of the same material. Alternatively, they may be made of different materials.

[0044] The anodic electrical connection tabs may be made of an electrically conductive material, in particular metal, for example aluminium.

[0045] The anodic electrical connection tabs of the various pocket-type cells of the assembly according to the invention may be made of the same material. Alternatively, they may be made of different materials.

[0046] The anodic and cathodic electrical connection pins of the same pocket-type cell can be made of different materials.

[0047] The electrical connection pins of a pocket-type cell can be located at two opposite ends of the pocket-type cell.

[0048] The electrical connection tabs of a pocket-type cell can extend before folding in the flattening plane of said cell or parallel to it.

[0049] Preferably, the electrical connection tabs are located on the edge of the cells, in particular on the two smallest opposite faces of the edge.

[0050] The anode electrical connection lugs can be coupled to the anode by a side of width lpa.

[0051] The cathode electrical connection lugs can be coupled to the cathode by a side of width lpc.

[0052] This coupling of the connection legs on the anode and the cathode by a side of width 1 pa or lp results in the folding of the electrical connection legs on the parallel connection connectors taking place in the direction of the length of the legs.

[0053] By "parallel connection connector" is meant an element enabling the electrical connection together in parallel of the pocket-type cells of an assembly according to the invention.

[0054] The parallel connection connectors may be made of an electrically conductive material, in particular metal, for example aluminium or copper.

[0055] The two parallel connectors are preferably identical in shape. Alternatively, they may have different shapes. The parallel connectors may be substantially rectangular. Alternatively, they may have another shape, for example, curved.

[0056] Each parallel connection connector may include a base portion that is substantially rectangular in shape when viewed from above and one or more branches, in particular two branches, connecting, in particular perpendicularly, to said base portion.

[0057] The branch or branches may have a substantially rectangular shape when viewed from above.

[0058] The branch or branches may all have the same shape and dimensions. Alternatively, they can have different shapes or sizes.

[0059] The base portion and / or the branch(es) can be flattened and arranged so that the parallel connection connector is flat.

[0060] Each parallel connection connector may have a comb shape, the branches of the connector connecting to the base portion on the same side of it.

[0061] Each parallel connector may have two branches, the branches forming substantially a U shape with the base portion. A U-shaped parallel connector provides a large connection surface while maintaining a simple form.

[0062] Each electrical connection leg of a pocket-type cell can be folded over one face of a branch of a parallel connection connector.

[0063] The pocket-type cells of the assembly can be arranged in pairs of consecutive cells.

[0064] The electrical connection anodic legs of a pair of consecutive cells can be folded on the same face of the same branch of the parallel anodic connector of the assembly.

[0065] The cathode electrical connection pins of a pair of consecutive cells can be folded on the same face of the same branch of the parallel cathode connector of the assembly.

[0066] Consecutive cells forming a pair may be arranged on either side of a branch onto which their anodic or cathodic electrical connection leads are folded. Alternatively, they may be arranged on the same side of said branch.

[0067] Each branch may carry two electrical connection tabs for two consecutive cells forming a pair of cells, the cells of the pair being arranged on either side of the branch such that their electrical connection tabs, bent over said branch, come into contact. The ends of the electrical connection tabs may meet. Alternatively, the electrical connection tabs may overlap, at least partially.

[0068] The two consecutive cells forming a pair can be arranged symmetrically along a plane parallel to the flattening planes of each of the cells.

[0069] The arrangement of the cells of a pair on either side of a branch allows the whole to gain in compactness.

[0070] The assembly may include one or more dividers.

[0071] The interlayer(s) may have a substantially rectangular parallelepiped shape. The interlayer(s) may be flattened. The interlayer(s) may have two principal faces joined by an edge. The dimensions of the principal faces of the interlayer(s) may be substantially the same as the dimensions of the interlayer(s). dimensions of the main faces of the pocket-type cells of the assembly.

[0072] The interlayers may be made of an electrically insulating material, in particular foam.

[0073] An interlayer, in particular electrically insulating, especially made of foam, can be arranged between two consecutive cells.

[0074] An interlayer may be placed between consecutive cells of a pair of cells. In one embodiment, an interlayer is placed between consecutive cells of each pair of cells. An interlayer may be placed between two pairs of cells. In one embodiment, an interlayer is placed between each pair of cells.

[0075] The electrical connection tabs can be welded after being bent, in particular by laser, onto the parallel connection connectors.

[0076] The electrical connection pins of two consecutive cells forming a pair of cells can overlap on the parallel connector. The electrical connection pins can be soldered to each other. A pattern can be defined on an overlapping area of ​​the electrical connection pins, and the laser source can pass through said pattern to solder the connection pins together on the parallel connector. Passing the laser source over the pattern causes the components to melt and thus solder the elements together.

[0077] The invention further relates, independently or in combination with the above, to a stack of electrical accumulator cells, comprising several electrical energy storage assemblies as defined above and two end cheeks between which the electrical energy storage assemblies are arranged.

[0078] The stack can include between 5 and 20 electrical energy storage sets, or even between 7 and 18, better between 10 and 15, for example 13 electrical energy storage sets.

[0079] The assemblies can be arranged in at least one row, in particular in a single row arranged between the two end cheeks.

[0080] An interleaf can be arranged between an end cheek and a cell contiguous to the end cheek.

[0081] In one embodiment, an interleaf may be arranged between each end cheek and a cell contiguous to the end cheek.

[0082] The end cheeks can be held tightly by at least one clamping element, each end cheek having in particular at least one notch for receiving the clamping element. The end cheeks can be as described below.

[0083] The clamping element can be as described below. Stack of electric battery cells

[0084] The invention also relates, independently or in combination with the foregoing, to a stack of electrical accumulator cells comprising: - two end cheeks, - a plurality of pocket-type electric accumulator cells arranged in at least one row of cells, between the two end cheeks, in particular in a single row of cells, - a plurality of interlayers, particularly made of foam, arranged between consecutive cells and / or between an end cheek and a cell adjacent to the end cheek, - optionally a strain gauge, the end cheeks being held tightly by one or more clamping elements in order to comply with a specified clamping force, the strain gauge allows in particular to monitor the clamping force F of the clamping elements.

[0085] By applying a predetermined clamping force to the stack according to the invention, it is possible to control the compression of the cells while leaving the final stack length flexible. Thus, in the stack according to the invention, there is no fixed stack length.

[0086] By "stacking length" is meant the length separating two end cheeks, measured along the row of cells along a longitudinal axis X of the row.

[0087] Controlling cell compression is particularly important because a cell compressed to the correct pressure has a longer lifespan. Controlling compression within the stack according to the invention is made possible by the presence of interlayers, particularly foam interlayers, which are flexible elements with a spring-like force.

[0088] The stack may include a strain gauge, which can be used to monitor the clamping force F, also known as the final clamping force, of the clamping elements. The presence of the strain gauge allows verification of proper compression control within the stack.

[0089] The strain gauge can be disposed on one of the clamping elements.

[0090] The strain gauge can be used to measure the elongation of the element(s) clamping in a given direction. Thus, the strain gauge, being calibrated at the time of the stack's manufacture, can allow the applied force to be estimated.

[0091] The clamping force setting can be 0.1 * SN where S is the surface area in mm² of a principal face of a cell. The clamping force setting to be applied can be 1.5 to 2 times greater than the desired final clamping force due to taking into account the phenomenon of relaxation.

[0092] The final clamping force F to be obtained can be between 2000 and 6000 N, or even between 3000 and 5000 N, for example being around 4000 N. To obtain a final clamping force F of this order, it is necessary to comply with a clamping force setpoint of between 1000 and 10000 N, or even between 2000 and 9000 N, for example being between 6000 and 8000 N.

[0093] The stack of electric accumulator cells can comprise between 2 and 100 pocket-type cells, better between 40 and 80, for example 52 pocket-type cells.

[0094] The end cheeks are generally parallelepiped in shape, particularly rectangular parallelepiped. The end cheeks may have two main faces joined by an edge. The edge of an end cheek may have two shorter sides and two longer sides. The end cheeks may be made of metal, particularly aluminum.

[0095] The fastening elements may be straps or banding. The fastening elements are preferably made of metal, for example steel, in particular stainless steel.

[0096] A stack of cells can have between one and six clamping elements, for example four clamping elements.

[0097] Each end plate may have at least one receiving notch for a clamping element. A "receiving notch" is a cutout designed to accommodate at least one clamping element. The notch secures the clamping element, preventing it from slipping or moving. Thus, the presence of the receiving notch(s) ensures that the clamping element retains a minimum length once tightened. The receiving notch(s) may be formed on an edge of an end plate, particularly on one of the longer sides of the edge.

[0098] In one embodiment, an end cheek has at least one pair of notches, arranged symmetrically on two longer opposite sides of the edge of the end cheek.

[0099] Alternatively or additionally, the receiving notch(s) may extend across the entire width of an end cheek, in particular parallel to an edge of the end cheek. The receiving notch(s) may be in the form of a groove.

[0100] The two end cheeks may have as many receiving notches as each other, in particular arranged substantially similarly.

[0101] In one embodiment, each cheek has as many receiving notches, in particular in the form of a groove, as there are clamping elements.

[0102] An interlayer, in particular made of foam, may be placed between all the cells consecutive. An interlayer, particularly made of foam, may be placed between an end cheek and a cell adjacent to the end cheek. In one embodiment, an interlayer may be placed between each end cheek and a cell adjacent to the end cheek.

[0103] The plurality of cells may comprise several electrical energy storage assemblies. Each electrical energy storage assembly may comprise a plurality of pocket-type electrical storage cells as described above. In particular, each pocket-type cell may comprise: - a cathode and an anode enclosed in a pocket, - a cathode ray pin for electrical connection, electrically coupled to the cathode, and - an anodic leg for electrical connection electrically coupled to the anode, the anodic and cathodic legs for electrical connection protruding from the pocket.

[0104] The plurality of cells arranged in the stack can include between 5 and 20 electrical energy storage sets, or even between 7 and 18, better between 10 and 15, for example 13 electrical energy storage sets.

[0105] In addition, each electrical energy storage assembly may include a cathode connector and an anode connector for paralleling the cells of the plurality of cells in the assembly, as described above. The cathode and anode connectors may each have at least one flattened portion, with the cathode leads folded over the cathode connector and the anode leads folded over the anode connector, so as to electrically connect the cathodes of the pocket-type cells on the one hand and the anodes of the pocket-type cells on the other.

[0106] Each parallel connection connector may include a base portion that is substantially rectangular in shape when viewed from above and one or more branches, in particular two branches, connecting, in particular perpendicularly, to said base portion, each parallel connection connector having in particular a comb shape, the branches of the connector connecting to the base portion on the same side thereof.

[0107] Each parallel connection connector may have two branches, the branches forming substantially a U with the base portion.

[0108] Each electrical connection leg of a pocket-type cell can be folded over one face of a branch of a parallel connection connector.

[0109] Each branch can carry two electrical connection tabs of two consecutive cells forming a pair of cells, the cells of the pair being in particular arranged on either side of the branch so that their electrical connection tabs bent on said branch come into contact.

[0110] An interlayer, in particular made of foam, may be placed between the cells of each electrical energy storage unit. An interlayer, in particular made of foam, may be placed between each electrical energy storage unit.

[0111] Each electrical energy storage unit included in the stack may have, as a variant or additionally, any of the characteristics as previously defined above.

[0112] The invention also relates, independently or in combination with the foregoing, to an electric accumulator module comprising: - two stacks of pocket-type electric battery cells as defined previously, arranged so that the longitudinal axes of the rows of each stack are parallel to each other, - a heat exchanger plate positioned between the two stacks and in thermal contact with them, the heat exchanger plate being oriented substantially parallel to the longitudinal axes of the rows of each stack.

[0113] The cells can extend parallel to a general flattening plane of the cells, the heat exchanger plate being oriented substantially perpendicular to the general flattening plane of the cells.

[0114] Both stacks may comprise the same number of pocket-type cells. Both stacks may comprise the same number of interlayers, particularly foam interlayers. The alternation between interlayers and pocket-type cells may be identical in both stacks.

[0115] The term "front of the module" refers to a side of the module where two end cheeks, one from each stack, are aligned.

[0116] The term "rear of the module" refers to the side opposite the front of the module.

[0117] A front end cheek and a rear end cheek are distinguished for each stacking. The front end faces of both stacks can be identical in shape and dimensions. The rear end faces of both stacks can be identical in shape and dimensions.

[0118] Both stacks can comprise the same number of clamping elements.

[0119] The two stacks of a module may have different lengths. Indeed, since there is a single clamping force requirement, depending on the compression of the interlayers and cells, which may depend on the age or type of foam, for example, or the respective age of the cells, two stacks with the same number of cells and interlayers may have different or identical lengths. The stacks may also have the same length.

[0120] Whether the stacks are of the same length or not results from the crushing during tightening and does not correspond to two different embodiments.

[0121] The rear end cheeks of the module can be offset from one another. The other. They are generally not aligned. This misalignment arises because the lengths of the two stacks of the module may differ. Alternatively, the rear end panels are aligned.

[0122] The presence of a heat exchanger plate and its arrangement within the module allows for efficient cooling, particularly at the core of the module, while maintaining a compact and easy-to-assemble module.

[0123] The heat exchanger plate may have internal channels through which a coolant, in particular glycol water, flows.

[0124] The heat exchanger plate may have four sub-parts formed by extrusion. The heat exchanger plate may be made of plastic.

[0125] The heat exchanger plate can be welded to at least one side of each stack. In one embodiment, the heat exchanger plate is welded to the two end sides located at the front of the module.

[0126] Thermal paste can be applied between the heat exchanger plate and the cell stacks. The thermal paste can be deposited on the entire side of the cell edge adjacent to the heat exchanger plate, except for the areas where the clamping elements pass. The thermal paste improves thermal conductivity between the heat exchanger plate and the cells, thereby improving the module's cooling. Bus bar electrical connection

[0127] The invention also relates, independently or in combination with the foregoing, to an electrical connection busbar for several sets of electric battery cells, comprising:

[0128] - a plurality of rigid elements, each comprising at least one plate of electrical connection,

[0129] - one or more flexible elements connecting the rigid elements together, the flexible element(s) that can bend so that the bus bar adapts to a variable spacing between the sets of electric battery cells to be connected.

[0130] The bus bar can also be called "barre omnibus" in French.

[0131] By "bendable," it is meant that the flexible elements can, when the spacing between two sets of electrical storage cells to be connected requires it, bend flexibly and take on a substantially U-shaped form to allow for proper arrangement of the rigid elements on the cell groups. Conversely, when the situation requires it, the flexible elements can extend along their entire length and allow for greater spacing between the sets of cells to be connected.

[0132] The bar bus according to the invention can, by its adaptability, be suitable for different em stacking of electrical battery cell assemblies. It also allows for consideration of cell aging, which tends to manifest itself through swelling, thus modifying the spacing between the cell assemblies to be connected.

[0133] The bus bar can be configured to electrically connect the sets of electric accumulator cells in series.

[0134] The rigid elements of the bus bar can be flat. They can all be in the same plane. They can be aligned along a longitudinal axis. This is the longitudinal axis of the bus bar.

[0135] The bus bar can have a substantially straight profile in longitudinal section.

[0136] The bus bar may comprise an even or odd number of rigid elements. In In terms of embodiments, the bus bar can comprise three, five or seven rigid elements.

[0137] One or more rigid elements may be intended to be arranged, each at least in part, on two consecutive sets of electrical accumulator cells.

[0138] One or more rigid elements may be intended to be arranged each on a single set of cells.

[0139] A set of electrical accumulator cells may only be in contact with a single rigid element.

[0140] The connection plate of the rigid elements can be brought into contact, in particular welded, at least in part to a connector connecting together the cells forming a set of electric accumulator cells.

[0141] In one embodiment, the bus bar according to the invention allows several electrical energy storage assemblies as previously defined to be connected in series and the connection plate of the rigid elements is brought into contact, in particular welded, at least in part to a parallel connection connector, in particular to the base portion of the parallel connection connector.

[0142] Each set of electrical accumulator cells connected to the bus bar can be an electrical energy storage set as previously defined, and can have, alternatively or additionally, any of the characteristics as previously defined above.

[0143] The rigid elements may have a substantially rectangular shape when viewed from above.

[0144] The rigid elements may take the form of a frame. The frame may contain an electrical connection plate. The electrical connection plate may be arranged along one side of the frame, in particular parallel to the longitudinal axis of the bus bar. The electrical connection plate may have the same length as the frame. The electrical connection plate may have a width less than the width of the frame, in particular less than half the width of the frame.

[0145] The electrical connection plate may be made of an electrically conductive material, in particular metal, for example aluminium.

[0146] The frame may be partially hollow.

[0147] The frame may be made of a conductive material, in particular metal, for example in aluminum or copper.

[0148] The bus bar may comprise a plurality of non-terminal rigid elements that are identical in shape and dimensions, as well as a terminal rigid element located at one end of the bus bar.

[0149] The rigid non-terminal elements can each be arranged in part on two consecutive sets of electrical accumulator cells to be connected.

[0150] The terminal element may be smaller in size than the non-terminal elements. In one embodiment, the terminal element is shorter than the non-terminal elements, the length of a rigid element being measured along the longitudinal axis of the bus bar.

[0151] The terminal element can be arranged on a single set of electric accumulator cells.

[0152] The flexible element(s) may be made of a polymer material, for example polyethylene film or epoxy.

[0153] One or two flexible elements can be inserted into one side of the frame formed by each rigid element.

[0154] In one embodiment, the flexible element(s) are inserted into the side opposite the side along which the electrical connection plate is arranged.

[0155] In one embodiment, the bus bar comprises a single flexible element, passing through one side of each rigid element and connecting the rigid elements together one after the other.

[0156] The flexible element can be welded to each rigid element.

[0157] The flexible element can be arranged so that a length Ls of flexible element, by An example with a length between 20 mm and 50 mm separates two consecutive non-terminal rigid elements. The flexible element can be arranged so that the length of flexible element separating a terminal rigid element from another rigid element is different from Ls, specifically less than Ls

[0158] In another embodiment, the bus bar comprises several flexible elements, each flexible element connecting two consecutive rigid elements. The flexible elements may all have the same length. Alternatively, the flexible elements may have different lengths. The flexible element connecting a terminal rigid element to another rigid element may be of a different length, in particular shorter, than the flexible elements separating two non-terminal rigid elements.

[0159] Each rigid element may include one or more sensors enabling monitor the temperature and / or voltage of the cells.

[0160] Rigid elements may have different numbers and / or types of sensors.

[0161] In one embodiment, each rigid element includes a first sensor for monitoring the temperature and a second sensor for monitoring the voltage of the electrical accumulator cell set or sets.

[0162] In another embodiment, each rigid element includes a sensor for monitoring the voltage of the electrical accumulator cell set(s) and one or both of the terminal rigid elements also include a sensor for monitoring the temperature.

[0163] The presence of a temperature sensor makes it possible to detect any thermal runaway of a cell. Under certain conditions, the presence of a sensor at each end of the bus bar in a rigid terminal element can highlight the temperature evolution within the row of cell assemblies to be connected.

[0164] The sensor(s) may include one or more flexible printed circuits provided with tracks, in particular made of copper, brought into contact with the cells.

[0165] A flexible printed circuit may have a first portion inserted into one side of the frame formed by the rigid element, and one or more complementary portions extending into the frame and attaching perpendicularly to the first portion.

[0166] The temperature sensor(s) can be arranged in the middle of one of the sets of cells to be connected

[0167] The voltage sensor(s) can be arranged more freely within the rigid element where the same potential is applied.

[0168] In an embodiment where there is a single flexible element, the flexible element can carry one or more conductive tracks, so as to transmit at least one piece of information measured by the sensor(s).

[0169] The flexible element can contain as many conductive tracks as there are sensors in the bus bar. A conductive track can extend from each rigid element, from which it carries at least one piece of information measured by a sensor, to a final end of the bus bar.

[0170] The conductive tracks carried by the flexible element may therefore not have the same length.

[0171] The conductive tracks may be analog signal tracks.

[0172] The invention also relates, independently or in combination with the foregoing, to a stack of electrical accumulator cells comprising: - two end cheeks, - a plurality of electrical storage cells arranged in at least one row between the two end cheeks, the cells being distributed in several sets of cells to be connected in series, in particular in a single row, - a first bus bar as previously defined, arranged on top of the stack, and a second bus bar as previously defined, arranged on the bottom of the stack, the bus bars connecting the sets of cells in series.

[0173] The "top" of the stack is defined as a side of the stack extending perpendicularly to the end cheeks. The "bottom" of the stack is the side opposite the "top".

[0174] The "front" of the stack refers to one of the sides bearing an end plate.

[0175] Bus bars may include a connecting bar.

[0176] By "connection bar" is meant a part located at one end of the bus bar which allows power and / or signals, for example voltage or temperature, to be transmitted to a terminal box.

[0177] The connecting bar may have a main portion in the form of a straight bar and terminate in an angled end on one side and a flat end on the other. The angled end may be attached to a rigid element of the bus bar. The main portion of the connecting bar may extend along a portion of the end plate located at the front of the stack.

[0178] The connecting bar can be fixed, in particular welded, to the end cheek at its flat end.

[0179] The end cheek located at the front of the stack may have on its edge, in particular on the two smaller sides of the edge, a notch each allowing the passage of a connecting element.

[0180] A flexible printed circuit can extend from the rigid element attached to the angled end of the connecting bar, to the flat end of the connecting bar.

[0181] The flexible printed circuit board can be arranged so that a length lc of flexible printed circuit board, for example between 5 and 15 cm, protrudes from the flat end of the connecting bar so as to connect to a terminal box.

[0182] The flexible printed circuit board in the connection bar allows the transmission of signals, such as voltage and temperature, carried by the conductive track(s) of the flexible element, and / or power to a terminal box. The connection bar of the first bus bar can transmit both signals and power to a terminal box. The connection bar of the second bus bar may only transmit signals to the terminal box and not power.

[0183] In one embodiment, the terminal element of each bus bar is contiguous to an end cheek.

[0184] The rigid elements of the first bus bar can be offset by a set of cells relative to the rigid elements of the second bus bar so that the current flows successively from top to bottom and from bottom to top in the cells of the stack.

[0185] Each set of electrical storage cells can be an electrical energy storage set as defined above. Each electrical energy storage set can comprise a group of pocket-type electrical storage cells. Each pocket-type cell can comprise: - a cathode and an anode enclosed in a pocket, - a cathode ray pin for electrical connection, electrically coupled to the cathode, and - an anodic leg for electrical connection electrically coupled to the anode, the anodic and cathodic legs for electrical connection protruding from the pocket.

[0186] Each electrical energy storage assembly may include a cathode connector and an anode connector for paralleling the cells, the cathode and anode connectors each having at least one flattened portion, the cathode lugs being folded each over the cathode connector and the anode lugs being folded each over the anode connector, so as to electrically connect the cathodes of the different pocket-type cells on the one hand and the anodes of the different pocket-type cells on the other hand.

[0187] The connection plate of each rigid element can be brought into contact, in particular welded, at least in part to a parallel connection connector.

[0188] The electrical storage cells may be pocket-type cells and the stack may comprise: - two end cheeks, - a plurality of foam interlayers, arranged between consecutive cells and / or between a cell and an end cheek contiguous to the cell, - optionally a strain gauge, the end cheeks being held tightly by one or more clamping elements so as to comply with a clamping force setpoint F, the strain gauge allows in particular to monitor the clamping force F of the clamping elements.

[0189] Each stack can be a stack of electric accumulator cells as described above and can have, alternatively or additionally, any of the characteristics as previously defined above.

[0190] The invention also relates, independently or in combination with the foregoing, to an electric accumulator module comprising: - two stacks of electrical storage cells as previously defined, arranged so that the longitudinal axes of the rows of each stack their sides are parallel to each other, - a heat exchanger plate positioned between the two stacks and in thermal contact with them, the heat exchanger plate being oriented substantially parallel to the longitudinal axes of the rows of each stack.

[0191] The cells can extend parallel to a general flattening plane of the cells, the heat exchanger plate being oriented substantially perpendicular to the general flattening plane of the cells. Interconnection set of two bar buses

[0192] The invention also relates, independently or in combination with the foregoing, to an interconnection assembly for two busbars comprising:

[0193] - a first flat interconnecting piece comprising:

[0194] - a base, substantially rectangular in top view, - a connecting section, roughly rectangular in top view, - a central part, roughly rectangular when viewed from above, having a first end attached perpendicularly to the base and a second end attached perpendicularly to the connecting part,

[0195] - a second curved interconnecting piece comprising:

[0196] - a base, substantially rectangular in top view, - a connecting section, roughly rectangular in top view, - a central part, at least in part substantially rectangular in view from above, having a first flat end attached perpendicularly to the base and a second angled end attached perpendicularly to the connecting part,

[0197] each base of the two interconnecting parts being intended to be connected to one of the bus bars and the connecting parts of the two interconnecting parts being in particular intended to be brought into contact with each other, being in particular in contact with each other, especially when using the interconnection assembly to interconnect two bus bars.

[0198] The angled end of the second interconnecting piece can be arranged so that the connecting part of the first interconnecting piece can overlap at least partially on the connecting part of the second interconnecting piece, when the bases of the two interconnecting pieces are aligned horizontally, in particular when the bases of the two interconnecting pieces are connected to two bus bars arranged at the same height.

[0199] The interconnecting parts may be made of an electrically conductive material, in particular metal, for example aluminium or copper.

[0200] The base of the interconnecting parts may have a shoulder. This shoulder facilitates its integration into the bus bar.

[0201] The invention also has as its object, independently or in combination with what precedes, an electrical accumulator module comprising:

[0202] - two stacks of electrical accumulator cells, each comprising: - two end cheeks, - a plurality of electrical storage cells arranged in at least one row between the two end cheeks, in particular in a single row, the cells being distributed in several sets of cells to be connected in series,

[0203] the two stacks being arranged side by side parallel so that two end cheeks, one of each stack, are aligned at the front of the module,

[0204] - two bus bars, each arranged on the bottom of a stack so that the two bus bars are placed side by side and parallel to each other, each bus bar connecting in series the sets of cells in a stack,

[0205] - an interconnection set as defined above connecting the two buses bar between them.

[0206] The term "front of the module" refers to a side of the module where two end cheeks, one from each stack, are aligned.

[0207] The term “rear of the module” means the side opposite the front of the module.

[0208] The interconnection assembly according to the invention can allow for series connection the two stacks of electrical accumulator cells in the module.

[0209] Each bus bar of the module may include: - a plurality of rigid elements, each comprising at least one electrical connection plate, - one or more flexible elements connecting the rigid elements together,

[0210] the flexible element(s) being able to bend so that the bus bar adapts to a variable spacing of the sets of electrical storage cells to be connected.

[0211] The module may comprise a plurality of non-terminal rigid elements that are identical in shape and dimensions, as well as a terminal rigid element located at one end of the bus bar and contiguous to an end plate located at the rear of the module.

[0212] An interconnecting piece may be inserted into an end element of a bus bar in each stack so that the connecting portion of the interconnecting piece is arranged between the two stacks.

[0213] The first flat interconnecting piece can be arranged at least partly above the second curved interconnecting piece so that the interconnecting parts of the two interconnecting pieces overlap.

[0214] This configuration can occur when the stacks have the same length, or different lengths.

[0215] The stacks may have different lengths, and the end cheeks and terminal elements of the two bus bars may be offset at the rear of the module; the connecting parts of the interconnecting pieces may be aligned between the two In stacks, the connecting parts can be long enough to be able to touch at one end.

[0216] The first flat interconnecting piece can slide relative to the second curved interconnecting piece, thus allowing the two connecting parts of the interconnecting pieces to be offset from each other, while maintaining contact over at least part of their length. Electrical connection can therefore occur, despite the offset between the stacks of different lengths.

[0217] Each bus bar can be a bus bar within the meaning of the invention and can have, alternatively or additionally, any of the characteristics as previously defined above.

[0218] Each stack can be a stack of electrical accumulator cells within the meaning of the invention and can have, alternatively or additionally, any of the characteristics as previously defined above.

[0219] Each set of electrical accumulator cells connected to the bus bar can be an electrical energy storage set as previously defined, and can have, alternatively or additionally, any of the characteristics as previously defined above. Electric battery module pack

[0220] The invention also relates, independently or in combination with the foregoing, to a pack of electric accumulator modules comprising:

[0221] - several electrical storage modules, each comprising: • two stacks of electrical storage cells, each comprising: • two end cheeks, • a plurality of electrical storage cells arranged in at least one row between the two end faces, in particular in a single row,

[0222] the two stacks being arranged side by side parallel so that two end cheeks, one of each stack, are aligned at the front of the module, • a heat exchanger plate disposed between the two stacks and in thermal contact with them, the plate protruding from the two stacks by an end end at the rear of the module,

[0223] with the modules aligned laterally, the adjoining sides of two consecutive modules being fixed, in particular welded, to each other,

[0224] - a terminal box, arranged on the end sides located at the front of the modules,

[0225] - one or more fixing bars, connecting the modules together, the bar(s) fixing being attached to the heat exchanger plate of each module at the end end of the heat exchanger plate.

[0226] The presence of fixing bars and their arrangement according to the invention makes it possible to ensure good rigidity of the module in cases where the stacks of the different modules would not have the same length, thereby introducing an offset between the end cheeks at the rear of the modules and preventing the end cheeks from being welded together.

[0227] In one embodiment, the pack includes two fixing bars.

[0228] By "laterally" is meant a direction perpendicular to the rows of the em piles.

[0229] The end cheeks at the rear of the module may be recessed from the fixing bar.

[0230] In one embodiment the pack can contain four modules.

[0231] The fixing bar(s) may be welded to the heat exchanger plate. The fixing bar(s) may be attached to a slice parallel to the end cheeks of the heat exchanger plate.

[0232] Each stack can be a stack of electric accumulator cells as defined above and can have, alternatively or additionally, any of the characteristics as previously defined above.

[0233] The terminal box can be located on the main faces of the end panels. The terminal box can contain the electronics for measuring voltage and / or temperature and balancing the cells. The terminal box can connect the modules in series.

[0234] In an embodiment where the stack is a stack of electric accumulator cells as defined above, the terminal box connects the modules in series by connecting the flexible printed circuits protruding from the flat end of the connection bar of the stacks of the modules to be connected.

[0235] The invention further relates, independently or in combination with the above, to a column of electric accumulator module packs comprising several electric accumulator module packs as defined above stacked one on top of the other, the terminal boxes of each pack being connected to each other.

[0236] In one embodiment, the column comprises four packs of electric accumulator modules.

[0237] The end cheeks located at the front of two packs stacked one on top of the other can be in contact. They can be fixed together.

[0238] The end cheeks located at the front of the packs can mechanically support the stacking of the packs.

[0239] The invention also relates, independently or in combination with the foregoing, to an electrical energy storage device comprising an enclosure, and, to inside the enclosure: - two rows of columns of electrical accumulator module packs as defined previously, the columns of each row being arranged side by side, - a control room, located in particular as an extension of the two rows.

[0240] The control room may include at least one of the following: a refrigeration production system, a power conversion system, a water cooling system, in particular coupled to the refrigeration production system, and an electronic control unit.

[0241] The power conversion system can be accessed from one end of the enclosure. The cooling system can be accessed from the opposite end.

[0242] A row of columns may include between 2 and 10 columns of electric accumulator module packs, better between 4 and 8, for example 5 columns.

[0243] The two rows of columns can be arranged without a passageway between them.

[0244] Such a device has the advantage of allowing a large number of accumulator modules to be placed inside the enclosure, and thus increasing the storage capacity.

[0245] This configuration is also well suited to liquid circulation cooling, particularly of water, of the modules, which allows for gains in compactness and efficiency.

[0246] Furthermore, in the absence of a central circulation corridor, the risk of having a person present in the premises in the event of an incident is eliminated.

[0247] The enclosure can be defined by a container conforming to maritime standards, in particular to the 20-foot standard. Brief description of the drawings

[0248] The invention will be better understood upon reading the following detailed description, a non-limiting example of implementation of the invention, and upon examination of the accompanying drawing, in which:

[0249] [Fig-1] Fig. 1 is a schematic and partial perspective view of a device electrical energy storage according to the invention.

[0250] [Fig.2] Fig.2 shows in perspective a column of packs of electric accumulator modules.

[0251] [Fig.3] Fig.3 illustrates an isolated pack of electric accumulator modules, in perspective.

[0252] [Fig.4] The [Fig.4] is a front view of the electrical accumulator module pack of the [Fig.3], from which the terminal box cover has been removed.

[0253] [Fig.5] The [Fig.5] is a rear perspective view of an electric accumulator module pack in which the stacks of the modules are not of the same length.

[0254] [Fig.6] The [Fig.6] is a rear perspective view of the electric accumulator module pack of the [Fig.3] in which the stacks of the modules have the same length.

[0255] [Fig.7] Fig.7 represents in perspective an electrical accumulator module whose two stacks have the same length.

[0256] [Fig.8] Fig.8 represents in perspective an electrical accumulator module whose two stacks do not have the same length.

[0257] [Fig.9] The [Fig.9] is a top view of the module of the [Fig.7].

[0258] [Fig. 10] The [Fig. 10] is a bottom view of the module of the [Fig.7].

[0259] [Fig. 11] The [Fig. 11] is a top view of the module of the [Fig.8].

[0260] [Fig. 12] The [Fig. 12] is a bottom view of the module of the [Fig.8].

[0261] [Fig. 13] The [Fig. 13] represents an interconnection set

[0262] [Fig. 14] The [Fig. 14] illustrates the first interconnecting piece of the [Fig.13] assembly.

[0263] [Fig. 15] The [Fig. 15] illustrates the second interconnecting piece of the [Fig.13] assembly.

[0264] [Fig. 16] The [Fig. 16] represents an isolated bus bar connected to the interconnection piece beyond [Fig. 14],

[0265] [Fig. 17] The [Fig. 17] represents an isolated bus bar connected to the interconnection piece beyond [Fig. 15].

[0266] [Fig. 18] The [Fig. 18] shows an insulated bus bar intended to come on top of a stack of an electric accumulator module.

[0267] [Fig. 19] The [Fig. 19] represents an isolated stack of electric accumulator cells.

[0268] [Fig.20] The [Fig.20] is a perspective view of an end cheek positioned at the front of the stack of the [Fig. 19].

[0269] [Fig.21] The [Fig.21] is a perspective view of an end cheek positioned at the rear of the stack of the [Fig. 19].

[0270] [Fig.22] The [Fig.22] is a perspective view of the heat exchanger plate.

[0271] [Fig.23] The [Fig.23] is a perspective view of a foam interleaf.

[0272] [Fig.24] Fig.24 represents an electrical energy storage system according to the invention.

[0273] [Fig.25] The [Fig.25] is a detail view of the [Fig.24] before folding of the electrical connection tabs of the pocket-type electric accumulator cells.

[0274] [Fig.26] The [Fig.26] is a perspective view of a paralleling connector.

[0275] [Fig.27] Fig.27 represents a pocket-type electric battery cell, perspective view. Detailed description

[0276] Figure 1 illustrates an electrical energy storage device 1 comprising an enclosure 2. Inside the enclosure 2, there are two rows 3 and 4 of columns 5 of packs 6 of electrical accumulator modules arranged side by side, and a control room 7 located in extension of the two rows 3 and 4.

[0277] A row of columns 3 or 4 comprises five columns 5 of packs 6 of electric accumulator modules.

[0278] The two rows 3 and 4 are arranged without a passageway between them.

[0279] Enclosure 2 is a 20-foot standard shipping container.

[0280] Figure 2 shows a column of 5 packs of 6 electric battery modules. Column 5 contains four packs of 6 electric battery modules.

[0281] Each pack of 6, shown individually in Figures 3 to 6, comprises:

[0282] - four modules of 8 electric accumulators each comprising: • two stacks of 9 electrical accumulator cells, each comprising: • two end cheeks 10 and 11, • a plurality of electrical storage cells arranged in a single row 12 between the two end cheeks 10 and 11,

[0283] the two stacks 9 are arranged side by side parallel so that two end cheeks 10 are aligned at the front of the module, • a heat exchanger plate 13 disposed between the two stacks 9 and in thermal contact with them, the plate 13 protrudes from the two stacks 9 by an end end 14 at the rear of the module 8,

[0284] the modules 8 are aligned laterally, the contiguous cheeks 10 of two consecutive modules 8 are welded together,

[0285] - a terminal box 15, disposed on the end cheeks 10 located at the front of the Module 8,

[0286] - two fixing bars 16, connecting the modules 8 together, the fixing bars 8 are fixed to the heat exchanger plate 13 of each module 8 at the end end 14 of the heat exchanger plate 13.

[0287] The two stacks 9 of a module 8 of a pack 6 may be of the same length as illustrated in [Fig. 6] or of different lengths as shown in [Fig. 5]. The end cheeks 11 at the rear of the module 8 may be recessed from the bars of fixing 16, as illustrated in figures 5 and 6.

[0288] The terminal box 15 is located on the main faces 19 of the end cheeks 10.

[0289] The terminal boxes 15 of the packs 6 of the column of packs 5 are connected between They. The end plates 10 located at the front of the stacked packs are in contact and fixed to each other. These plates 10 mechanically support the stacking of the packs 6.

[0290] Figures 7 and 8 show, in isolation, an electric battery module 8 when the two stacks 9 of the module 8 are respectively of the same length or of different lengths. Each stack 9 is in fact subject to a tightening setting F and not to a stack length setting. Two stacks 9 with the same number of cells can therefore have different or identical lengths.

[0291] Whether the stacks are of the same length or not results from the crushing during tightening and does not correspond to two different embodiments.

[0292] Figures 9 and 11 are top views of the modules of Figures 7 and 8 respectively. Figures 10 and 12 are bottom views of the modules of Figures 7 and 8 respectively.

[0293] The electrical storage cells arranged in a single row 12 between the end cheeks 10 and 11 of each stack 9 can be divided into several sets 20 of cells to be connected in series. Each stack 9 comprises 13 sets 20 of cells to be connected in series.

[0294] A bar bus 21 is arranged on top of each stack 9.

[0295] A bar bus 22 is arranged on the bottom of each stack 9.

[0296] The bar buses are arranged so that the two bar buses 21 at the top of the stack 9 on the one hand and the bus bars 22 at the bottom of the stack 9 on the other hand are side by side and parallel to each other, each bus bar connecting in series the sets 20 of cells of a stack 9.

[0297] An interconnection assembly 23, as illustrated in isolation in [Fig. 13], connects in series the two bus bars 22 located on the bottom of the module 8. The interconnection assembly 23 comprises:

[0298] - a first flat interconnecting piece 24, shown alone in [Fig. 14], including:

[0299] - a base 25, substantially rectangular in top view, - a connecting part 26, roughly rectangular in top view, - a central part 27, substantially rectangular in view from above, having a first end attached perpendicularly to the base 25 and a second end attached perpendicularly to the connecting part 26,

[0300] - a second curved interconnecting piece 28, shown alone in [Fig.15], including:

[0301] - a base 29, substantially rectangular in top view, - a connecting part 30, roughly rectangular in top view, - a central part 31, at least in part substantially rectangular in view from above, having a first flat end 32 attached perpendicularly to the base 29 and a second angled end 33 attached perpendicularly to the connecting part 30.

[0302] The angled end 33 of the second interconnecting piece 28 is arranged so that the connecting part 26 of the first interconnecting piece 24 partially overlaps the connecting part 30 of the second interconnecting piece 28, the bases 25 and 28 of the two interconnecting pieces 24 and 28 being horizontally aligned.

[0303] The interconnecting parts 24 and 28 are made of metal.

[0304] The bases 25 and 29 of the interconnecting parts 24 and 28 have a shoulder 34 which facilitates their integration into the bus bar 22.

[0305] The bus bars 22 of each stack 9 of the module 8 are shown in isolation in Figures 16 and 17 and a bus bar 21 is shown in isolation in [Fig.14],

[0306] Each bar bus 21, 22 includes:

[0307] - seven rigid elements 35, each comprising at least one connection plate electric 37,

[0308] -a flexible element 36 connecting together the rigid elements 35, the flexible element 36 can bend so that the bus bar 21, 22 adapts to a variable spacing between the sets 20 of electric accumulator cells to be connected in series.

[0309] The rigid elements 35 of the bus bar 21, 22 are flat. They are all in the same plane. They are aligned along a longitudinal axis X. This is the longitudinal axis of the bus bar.

[0310] The bus bar 21, 22 has a substantially straight profile in longitudinal section.

[0311] The rigid elements 35 have a shape in top view that is substantially rectangular.

[0312] The rigid elements 35 take the form of a frame 38. The electrical connection plate 37 is arranged along one side of the frame 38 parallel to the longitudinal axis X of the bus bar 21, 22. The electrical connection plate 37 has the same length as the frame 38 and a width less than half the width of the frame 38.

[0313] The electrical connection plate 37 is made of aluminium

[0314] Frame 38 is partly hollow.

[0315] The frame 38 is made of a conductive material, for example aluminium.

[0316] The bar bus 21, 22 comprises six non-terminal rigid elements 39 which are identical in shape and dimensions, as well as a terminal rigid element 40 located at a end of bus bar 21, 22.

[0317] The rigid non-terminal elements 39 are each arranged in part on two sets 20 of consecutive electrical accumulator cells to be connected, as seen in figures 7 and 8.

[0318] The terminal element 40 is smaller in dimensions than the non-terminal elements 39. The terminal element 40 is shorter than the non-terminal elements 39, the length of a rigid element 35 being measured along the longitudinal axis X of the bus bar 21, 22.

[0319] The terminal element 40 is arranged on a single set 20 of electrical accumulator cells. The terminal element 40 of each bus bar 21, 22 is contiguous to an end cheek 10, 11.

[0320] The first interconnecting piece 24 is inserted into the terminal element 40 of the bus bar 22 of [Fig. 16]. The second interconnecting piece 28 is inserted into the terminal element 40 of the bus bar 22 of [Fig. 17].

[0321] The bus bars 22 are arranged on the bottom of the stacks 9 so that the connecting parts 26, 30 of the interconnection assembly 23 come into contact. When the stacks 9 of the module 8 are of the same length, as in Figures 7, 9 and 10, the connecting parts 26 and 30 overlap along their entire length thanks to the angled end 33 of the second interconnection piece 28.

[0322] When the stacks 9 of the module 8 are of different lengths, as in Figures 8, 11, and 12, the first flat interconnecting piece 24 can slide relative to the second curved interconnecting piece 28, thus allowing the two connecting parts 26 and 30 of the interconnecting pieces to be offset from each other, while maintaining contact over at least part of their length. Electrical connection can therefore occur, despite the offset between the stacks of different lengths.

[0323] The flexible element 36 is made of a polymer material, for example a polyethylene film or epoxy.

[0324] The flexible element 36 is inserted into the side opposite the side along which the electrical connection plate 37 is disposed.

[0325] Each rigid element 35 includes a first sensor 41 for monitoring the temperature and a second sensor 42 for monitoring the voltage of the set or sets 20 of electrical accumulator cells.

[0326] The flexible element can include as many conductive tracks as there are sensors 41, 42. Each conductive track can extend from a rigid element 35, from which it receives at least one piece of information from a sensor 41 or 42, to one end of the bus bar 21, 22.

[0327] The sensors 41, 42 comprise one or more flexible printed circuits 43 equipped copper tracks, brought into contact with the cells.

[0328] A flexible printed circuit 43 may have a first portion inserted into one side of the frame 38 formed by the rigid element 35, and one or more complementary portions extending into the frame 38 and attaching perpendicularly to the first portion.

[0329] Each bus bar 21, 22 has a connecting bar 17

[0330] The connection bar 17 is located at one end of the bus bar 21, 22 and allows the transmission of power and / or signals, for example voltage or temperature, to the terminal box 15 of the pack 6 containing the module 8 which carries the bus bar on one of its stacks 9.

[0331] The terminal box 15 connects in series the modules 8 of a pack 6 of electric accumulator modules by means of connectors 18 linking together the flexible printed circuits 43 protruding from the connection bars 17 of the bus bars 21, 22 arranged on the stacks 9 of the modules 8.

[0332] The connecting bar 17 has a main portion 44 in the form of a straight bar and terminates in an angled end 45 on one side and a flat end 46 on the other. The angled end 45 is attached to a rigid element 35 of the bus bar 21, 22. The main portion 44 of the connecting bar 17 extends along a main face 19 of the end cheek 10 located at the front of the stack 9.

[0333] The connecting bar 17 is welded to the end cheek 10 at its flat end 46.

[0334] The end cheek 10 located at the front of the stack 9, shown in [Fig.20], has two main faces 19 connected by a slice 47. It has on each of the two smaller sides of the slice 47, a notch 48 each allowing the passage of a connecting bar 17.

[0335] A flexible printed circuit board 43 extends from the rigid element 35 attached to the angled end 45 of the connecting bar 17, to the flat end 46 of the connecting bar 17. A length lc of flexible printed circuit board 43, for example between 5 cm and 15 cm, extends from the flat end 46 of the connecting bar 17 so as to connect to the terminal box 15.

[0336] Within a stack 9, the rigid elements 35 of the first bus bar 21 arranged on the top of the stack are offset by a set 20 of cells relative to the rigid elements 35 of the second bus bar 22 arranged on the bottom of the stack so that the current flows successively from top to bottom and from bottom to top in the cells of the stack 9, as illustrated in Figures 9 and 10.

[0337] Figure 19 represents an isolated stacking of 9 comprising:

[0338] - two end cheeks 10,11, - a plurality of pocket-type 50 electrical accumulator cells arranged in a row of 12 cells between the two end cheeks 10 and 11 and distributed in 20 sets of electrical energy storage,

[0339] - a plurality of 51 foam interleaves, shown isolated in [Fig.23], arranged between consecutive cells and between an end cheek and a cell contiguous to the end cheek, the end cheeks 10, 11 being held tight by four clamping elements 49 so as to comply with a clamping force instruction F.

[0340] The clamping elements 49 are steel strapping bands.

[0341] The end cheek 10 located at the front of the stack, shown in [Fig. 20], and the The end cheek 11, located at the rear of the stack, illustrated in [Fig. 21], has a flattened rectangular parallelepiped shape. The end cheeks 10 and 11 are made of metal.

[0342] They each have four pairs of notches 52. The notches 52 of a pair are arranged symmetrically on the two longer sides of the edge 47 of the end cheeks.

[0343] The plurality of cells in stack 9 comprises 13 electrical energy storage sets.

[0344] Figure 22 represents a heat exchanger plate 13, intended to be arranged between two stacks 9 in thermal contact with them. The heat exchanger plate 13 has internal channels 53 through which a coolant, in particular glycol water, flows.

[0345] The heat exchanger plate 13 has four sub-parts formed by extrusion. The heat exchanger plate 13 is made of plastic.

[0346] The heat exchanger plate 13 is welded to the two end cheeks 10 located at the front of the module 8.

[0347] Thermal paste can be disposed between the heat exchanger plate 13 and the stacks 9 of cells of the module 8.

[0348] Figure 24 represents an electrical energy storage system comprising: - a plurality of pocket-type 50 electrical accumulator cells, each pocket-type 50 cell, as illustrated in [Fig. 27], comprising:

[0349] - a cathode and an anode enclosed in a pocket 54, - a cathode ray 55 electrical connection pin electrically coupled to the cathode, and - an anodic leg 56 for electrical connection electrically coupled to the anode, the anodic legs 56 and cathodic legs 55 for electrical connection protruding from the pocket 54,

[0350] - a cathode connector 57 and an anode connector 58 for parallel connection of the plurality of cells 50 of the set 20, the cathodic connectors 57 and anodic connectors 58 each having at least one flattened portion, the cathode legs 55 being folded each onto the cathode connector 57 and the anode legs 56 being folded each onto the anode connector 58, so as to electrically connect the cathodes of the pocket type cells 50 on the one hand and the anodes of the pocket type cells 50 on the other hand.

[0351] Fig. 25 represents a detail of Fig. 24 before the bending of the electrical connection tabs 55, 56 onto the paralleling connectors 57, 58.

[0352] The pocket 54 of each pocket-type cell 50 is flexible and takes the form of a film, as seen in [Fig.27].

[0353] The pocket 54 is made partially of electrically conductive material, for example aluminium, and is provided with an insulating coating.

[0354] The assembly comprises four pocket-type cells.

[0355] Pocket-type cells have two main faces 59 opposite connected by a slice 60.

[0356] Pocket-type cells have a rectangular parallelepiped shape.

[0357] The main faces of the pocket-type cells have a length L, which can be around 514 mm. The length of the main face is understood to be the largest dimension of the main face.

[0358] The main faces of the pocket-type cells have a width 1, which can be approximately 35.5 mm. Width is understood to mean the smallest dimension of the main faces.

[0359] The slice of pocket-type cells has a low thickness, for example about 16 mm.

[0360] Pocket-type cells are flattened.

[0361] The 60 slice of pocket-type cells has two large opposite faces and two small opposite faces.

[0362] The electrical connection tabs 55, 56 are substantially rectangular in shape before folding.

[0363] The two electrical connection tabs 55, 56 have the same dimensions.

[0364] The cathode electrical connection lugs have a very low thickness epc, for example 0.3 mm.

[0365] The anodic electrical connection lugs have a very low thickness epa, for example 0.4 mm.

[0366] The cathode electrical connection lugs 55 are made of nickel-coated copper.

[0367] The anodic electrical connection tabs 56 are made of aluminium.

[0368] The electrical connection pins 55, 56 of a pocket-type cell are located at two opposite ends of the pocket-type cell 55.

[0369] The electrical connection pins 55, 56 are located on the edge 60 of the cells, in particular on the two smallest opposite faces of the edge.

[0370] The anodic electrical connection lugs 56 are coupled to the anode by one side of width lpa.

[0371] The cathode electrical connection lugs 55 are coupled to the cathode by a side of width lpc.

[0372] The parallel connection connectors, as illustrated in [Fig.26], are made of metal, for example aluminium or copper.

[0373] The two parallel connection connectors 57, 58 are preferably of identical shape.

[0374] Each parallel connection connector 57, 58 comprises a base portion 61 of substantially rectangular shape in top view and two branches 62 connecting, perpendicularly to said base portion forming substantially a U.

[0375] The branches 62 are substantially rectangular in shape when viewed from above.

[0376] The 62 branches have the same shape and dimensions.

[0377] The base portion 61 and the branches 62 are flattened and arranged so that the paralleling connector is flat.

[0378] Each electrical connection leg 55, 56 of a pocket-type cell 50 is folded over one face of a branch 62 of a parallel connection connector 57, 58.

[0379] The pocket-type cells 50 of set 20 are arranged in pairs of consecutive cells.

[0380] Each branch 62 carries two electrical connection tabs for two consecutive cells forming a pair of cells, the cells of the pair being arranged in particular on either side of the branch 62 so that their electrical connection tabs, bent over said branch, come into contact. The ends of the electrical connection tabs meet.

[0381] The two consecutive cells forming a pair are arranged symmetrically.

[0382] The electrical connection tabs 55, 56 are welded after being bent, by laser, onto the parallel connection connectors 57, 58.

[0383] The invention is not limited to the examples just described.

[0384] The number of packs per column, modules per pack, sets per stack or cells per set may be different.

[0385] The layout of the rows and the control room within the enclosure may be different.

Claims

Claims

1. Pack (6) of electric accumulator modules (8) comprising: - several electric accumulator modules (8) each comprising: • two stacks (9) of electric accumulator cells each comprising: • two end cheeks (10, 11), • a plurality of electric accumulator cells arranged in at least one row between the two end cheeks, in particular in a single row (12), the two stacks being arranged side by side in parallel so that two end cheeks (10, 11), one of each stack, are aligned at the front of the module, • a heat exchanger plate (13) arranged between the two stacks (9) and in thermal contact with them, the plate (13) protruding from the two stacks by a final end (14) at the rear of the module,

2.

3.

4. the modules (8) being aligned laterally, the contiguous cheeks (10) of two consecutive modules being fixed, in particular welded, between them, - a terminal box (15), arranged on the end cheeks (10) located at the front of the modules, - one or more fixing bars (16), connecting the modules (8) together, the fixing bar(s) (16) being fixed to the heat exchanger plate (13) of each module (8) at the final end (14) of the heat exchanger plate. Pack of electric accumulator modules according to the preceding claim, the fixing bar(s) (16) being welded to the heat exchanger plate (13). Column (5) of packs (6) of electric accumulator modules (8) comprising several packs (6) of electric accumulator modules (8) according to any one of the preceding claims stacked on top of each other, the terminal boxes (15) of each pack being connected to each other. Electrical energy storage device (1) comprising an enclosure (2), and, inside the enclosure: - two rows (3, 4) of columns (5) of packs (6) of modules (8) of electric accumulator according to the preceding claim, the columns (5) of each row (3, 4) being arranged side by side, - a control room (7), located in particular as an extension of the two rows.

5. Electrical energy storage device (1) according to the preceding claim, the two rows (3, 4) of columns (5) being arranged without a circulation corridor between them.

6. Electrical energy storage device (1) according to any one of the two preceding claims, the enclosure (2) being defined by a container of maritime standard, in particular of the 20-foot standard.

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