Electrical energy storage and cell network

Abstract

The invention relates to an electrical energy storage device (1) with an electrode foil arrangement arranged in a polygonal cell housing (3). According to the invention, the edges (K) of the cell housing (3) extending in the direction of a longitudinal axis of the cell housing (3) are rounded, have a predetermined radius, and / or are chamfered at a predetermined angle. Furthermore, the invention relates to a cell assembly (2) with a plurality of such energy storage devices (1).

Description

The invention relates to an electrical energy store having an electrode foil arrangement arranged in a polygonal cell housing. The invention further relates to a cell assembly having a plurality of such energy stores.CN 217134494 U discloses a battery and a battery module and a battery pack including the same, wherein the battery comprises a case, a battery module and a battery pack, an end of the case is open, and the case has a regular polygonal prism shape. A cover body is disposed at an end of the shell, wherein the cover body and the shell together define a receiving space. A negative pole and a plurality of positive poles are arranged on the cover body, and the positive poles are arranged spaced apart from each other in the circumferential direction of the cover body. A pole core is disposed in the accommodation space.DE 10 2017 005 400 A1 discloses an energy storage arrangement for a motor vehicle and a motor vehicle. The energy storage arrangement comprises a plurality of energy storage elements, wherein each energy storage element is arranged in a polygonal housing component. The polygonal housing component houses the energy storage element laterally, wherein the separate housing components are connected via binding means in the region of component walls lying against one another in order to form a bond between one another.Furthermore, DE 699 27 934 T2 describes a battery. The battery comprises: (a) a container comprising a positive terminal and a negative terminal; (b) a single electrochemical cell disposed in the container, the cell having a positive electrode, a negative electrode, and a cell voltage measured at the positive electrode and the negative electrode of the cell; and (c) a controller electrically connected between the electrodes of the cell and the terminals of the container to generate an output voltage measured at the positive terminal and the negative terminal of the container. The controller is configured to electronically disconnect the cell from the terminals of the container when the controller detects a predefined state, the predefined state comprising one or more of: a reverse polarity, a short circuit, an overcharge of the cell, an overdischarge of the cell, and / or a full charge of the cell; and in that the control device monitors a temperature of the cell and disconnects the cell from the terminals of the container if the temperature of the cell exceeds a predetermined temperature, and / or the control device monitors a gas pressure of the cell and disconnects the cell from the terminals of the container if the gas pressure of the cell exceeds a predetermined pressure, and / or the control device monitors a hydrogen gas concentration of the cell and disconnects the cell from the terminals of the container if the hydrogen gas concentration of the cell exceeds a predetermined hydrogen concentration.The object of the invention is to specify a novel electrical energy store and a cell assembly having a plurality of electrical energy stores.The object is achieved according to the invention by an electrical energy store which has the features specified in claim 1 and by a cell assembly which has the features specified in claim 5.Advantageous embodiments of the invention are the subject matter of the dependent claims.An electrical energy store has a polygonal cell housing in which an electrode foil arrangement, for example a round cell, is arranged. According to the invention, it is provided that the edges of the cell housing running in the direction of a longitudinal axis of the cell housing are rounded, have a predetermined radius, and / or are beveled, have a predetermined angle.Because the cell housing of the energy store is configured in such a way, when a plurality of energy stores are arranged positioned with respect to one another, a laterally delimited intermediate space, in particular a cavity, is formed. This intermediate space can be filled with potting compound, so that the electrical energy stores are held in their position. The cell housing formed in this way thus represents a material-saving possibility for fixing a plurality of energy stores, in particular a cell assembly, which is also referred to as a cell module.In addition, the respective intermediate space can alternatively or additionally be used as a temperature control channel, in particular a cooling channel, in order to temperature control, in particular to cool, the adjacent energy stores by a waste heat which arises during a charging and discharging process being able to be discharged via this temperature control channel, for example with the aid of a temperature control medium, in particular fluid. It is also conceivable for the casting compound to form the temperature control medium. A temperature control of the electrical energy stores can thus be optimized.In one embodiment, the radius of the rounded edges is more than 3 mm, for example 3.5 mm, 4 mm, 5 mm or 6 mm. The radius is selected such that the intermediate space is formed between them by stacking a plurality of electrical energy stores. A component with a circular cross section with a radius of at least 3 mm can be arranged in the intermediate space, for example 3.5 mm, 4 mm, 5 mm or 6 mm. The intermediate space formed by means of a plurality of energy stores arranged with respect to one another therefore has a sufficient size in order to fill the potting compound into the intermediate space and / or to use the intermediate space as a temperature control duct in order to fix the electrical energy store and / or to control it with temperature in an optimized manner. Even if the edges are beveled, an intermediate space is produced between the electrical energy stores positioned relative to one another, which can be used for filling in potting compound and / or as a temperature control channel.According to one aspect of the invention, the rounded edges of a cell housing can be formed in such a way that the rounded edges are formed in an arcuate manner, for example an edge region of the rounded edges run tangentially to the sides of a cell housing.According to one aspect of the invention, the predetermined angle can have, for example, approximately 135 degrees, for example 135 degrees.In particular, the intermediate space has dimensions such that it can be ensured that a nozzle of a filling tool, by means of which potting compound can be filled into the intermediate space, can be arranged or moved in the intermediate space.In this case, different cross sections of tools are possible in order to be able to be introduced into the intermediate space.The potting compound serves in particular to fix the energy stores, wherein the potting compound can also have thermally conductive properties and can therefore influence temperature control management of the cell assembly. It can also be provided to fill the intermediate space only partially with casting compound. It is also conceivable to leave the intermediate space unfilled, so that material can be saved and a weight can be reduced.In a further embodiment, the cell housing has at least six edges running in the direction of the longitudinal axis, so that the cell housing, if this has six edges, is of hexagonal configuration. Based on such a shape, it is possible to arrange a plurality of energy stores on one another and with respect to one another, so that in particular in each case between three energy stores arranged on one another and positioned with respect to one another, such an intermediate space is formed for filling in the potting compound and / or a temperature control medium. If the edges are beveled, the cell housing has twelve edges, in particular longitudinal edges, wherein when a plurality of energy stores are arranged on one another and positioned relative to one another, an intermediate space is likewise formed. This intermediate space has in cross section substantially a triangular shape, for example a triangular shape in which the sides are formed in an arc shape, and is formed for filling in the potting compound and / or a temperature control medium.In a further possible embodiment, the cell housing is formed from plastic and / or metal, so that the cell housing is formed comparatively stably.In addition, the invention relates to a cell assembly having a plurality of electrical energy stores, wherein the electrical energy stores are arranged with respect to one another in such a way that a laterally closed intermediate space is formed at least by means of the rounded edges of the individual cell housings. The cell housing of the energy stores is configured such that the edges running in the direction of a longitudinal axis of the cell housing are rounded, have a predetermined radius, or are beveled, have a predetermined angle.The intermediate space formed by means of the rounded or beveled edges of the energy stores positioned with respect to one another can serve for filling in a potting compound, in particular for fixing the energy stores, and / or for filling in a temperature control medium for temperature controlling the energy stores.In one embodiment, the intermediate space is therefore designed to receive a potting compound and / or as a temperature control channel for controlling the temperature of the electrical energy stores forming the intermediate space.Exemplary embodiments of the invention are explained in more detail below with reference to drawings.The following are shown: FIG. 1 schematically shows a perspective view of an electrical energy store, FIG. 2 schematically shows a plan view of the electrical energy store, and FIG. 3 schematically shows an enlarged detail of a plan view of a cell assembly formed by means of three energy stores, FIG. 4 is a schematic top view of a cell composite formed by means of three energy spokes with beveled edges; and FIG. 5 schematically shows an enlarged detail of a plan view of a cell composite formed by means of three energy stores with beveled edges.Corresponding parts are provided with the same reference numerals in all figures.FIG. 1 shows a perspective view of an electrical energy store 1.FIG. 2 shows a plan view of the electrical energy store 1 and FIG. 3 illustrates a detail of a plan view of a cell assembly 2 formed by means of three energy stores 1.The electrical energy store 1 has a hexagonal cell housing 3, in which an electrode foil arrangement, not shown in more detail, is arranged. The cell housing 3 is formed from plastic and / or metal, so that the cell housing 3 has a specific stability. A shape of the cell housing 3 can vary, wherein the cell housing 3 is formed in polygonal fashion.Due to the hexagonal shape of the cell housing 3, the latter has six edges K which run in the direction of a longitudinal axis of the cell housing 3 and are of rounded design. In particular, the rounded edges K have a radius of more than 3 mm.Due to the rounded shape of the edges K of the cell housing 3, if, as shown in FIG. 3, three energy stores 1 are arranged on one another and relative to one another, an intermediate space Z that is laterally delimited by means of the rounded edges K is formed. Dimensions of the intermediate space Z with respect to its cross section are dependent on the radius of the rounded edges K. In particular, the radius of the rounded edges K is selected such that the intermediate space Z has predefined dimensions. In particular, the intermediate space Z has dimensions in cross section such that a component having a circular cross section of at least 3 mm can be arranged in the intermediate space Z. For example, a filling tool for filling the intermediate space Z with casting compound can be introduced into the latter.The potting compound can be / can be filled into the intermediate space Z, in particular as a material-saving possibility for fixing the energy stores 1 within the cell assembly 2. The potting compound is / is filled into the intermediate space Z, for example, in liquid form and cures there, with the result that the energy stores 1 are / are fixed in their respective position.Alternatively or additionally, the intermediate space Z can form a temperature control channel through which, for example, a temperature control medium can flow, so that a temperature control of the energy stores 1 adjoining the intermediate space Z can be optimized. The intermediate space Z is here fluidically coupled as a temperature control channel, for example, to a channel structure of a plate-shaped temperature control device, not shown in more detail.The potting compound can also form a heat-conducting element for transporting waste heat arising during operation of the energy stores 1, wherein the waste heat arising during a charging and discharging process of the energy stores 1 can be discharged from the cell assembly 2 via the potting compound as a heat-conducting element. The intermediate space Z can also be unfilled in order to save material and weight.FIGS. 3 and 4 show an alternative embodiment of the cell housing 3 of an electrical energy store 1, wherein FIG. 3 shows a plan view of a cell assembly 2 formed by means of three energy stores 1 with beveled edges K, and FIG. 4 shows an enlarged detail of the cell assembly 2.In this embodiment, the edges K are beveled at a predetermined angle, so that two edges K are formed from one edge K, so that the cell housing 3 of the respective energy storage device 1 according to the embodiment shown in FIG. 3 has twelve edges K.Due to the beveled edges K, twelve longitudinal sides are produced on the cell housing 3, wherein the longitudinal sides have alternately different widths b 1, b 2. A width b 1 has larger dimensions than a further width b 2, so that longitudinal sides with the width b 1 are formed wider than longitudinal sides with the further width b 2.FIG. 5 schematically illustrates an enlarged detail of a plan view of a cell composite formed by means of three energy stores with beveled edges.The intermediate space Z formed by means of cell housing 3 embodied in this way has a substantially triangular shape in cross section, wherein the intermediate space Z, as explained above, can be filled with potting compound, for example, or can also remain unfilled.The features described herein with respect to an electrical energy store and the advantages thereof can likewise relate to a cell assembly described herein and vice versa.List of reference characters1 Energy store 2 Cell composite 3 Cell housing K Edge Z Intermediate space b 1 Width b 2 Further widthReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedCN 217134494 U

[0002] DE 10 2017 005 400 A1

[0003] DE 699 27 934 T2

[0004]

Claims

Electrical energy store (1) having an electrode foil arrangement arranged in a polygonal cell housing (3), characterized in that the edges (K) of the cell housing (3) running in the direction of a longitudinal axis of the cell housing (3) are rounded, have a predetermined radius, and / or have a predetermined angle in a beveled manner.Electrical energy store (1) according to Claim 1, characterized in that the radius is more than 3 mm.Electrical energy store (1) according to Claim 1 or 2, characterized in that the cell housing (3) has at least six edges (K) running in the direction of the longitudinal axis.Electrical energy store (1) according to one of the preceding claims, characterized in that the cell housing (3) is formed from plastic and / or metal.Cell assembly (2) with a plurality of electrical energy stores (1) according to one of Claims 1 to 4, characterized in that the electrical energy stores (1) are arranged with respect to one another in such a way that a laterally closed intermediate space (Z) is formed at least by means of the rounded edges (K) or the beveled edges of the individual cell housings (3).Cell composite (2) according to Claim 5, characterized in that the intermediate space (Z) is designed to accommodate a potting compound and / or as a temperature control duct for controlling the temperature of the electrical energy stores (1) forming the intermediate space (Z).

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