DE202020106685U1 - Battery pack for an electrical device - Google Patents

Abstract

Battery pack (10) for an electrical device at least comprising - a housing, - one or more battery cells (16) with at least one positive pole (24) arranged at the end, the one or more battery cells (16) being arranged within the housing, - at least one Line carrier (18), which is electrically connected to the one or more accumulator cells (16), - it is provided that at least one foam element (20) is arranged at least at the end in the region of the positive pole (24) of the one or more accumulator cells (16) and / or is provided which is designed to at least largely intercept at least one electrolyte gas escaping and / or escaping at high speed from at least one defective and / or becoming defective accumulator cell (16) in the region of the positive pole (24) and / or or to extinguish.

Description

The present invention relates to a battery pack for an electrical device and an electrical device with such a battery pack having the features of the independent claims.

Battery packs are electrochemical energy stores that can be discharged and charged several times. So-called lithium-ion accumulators are used particularly frequently. In lithium-ion batteries, among other things, materials with high energy contents and highly flammable electrolytes are combined. Short circuits, high temperatures or mechanical deformations due to collisions can lead to a defect in one or more battery cells. In order to ensure safety during the operation of battery packs, the battery cells include various cell-internal safety devices. Possible safety devices of the accumulator cell include a PTC switch (positive temperature coefficient device), which is integrated in the electric circuit of the accumulator cell. When certain temperatures are reached, for example during the charging or discharging process, the PTC increases its internal resistance and reduces the flow of current, in order to prevent the battery cell from thermal runaway, for example.

So-called current interrupt devices (CID) are used as further safety devices for battery cells, which electrically switch off the battery cell before it reaches the ignition temperature. In particular, the CID separates the connection between the electrode and the contact as soon as a specified pressure is exceeded due to gas formation. The electrolyte gas formed in the accumulator cell leaves the accumulator cell via the CID, especially at high speed, and ignites immediately upon contact with oxygen. Such sparks present the risk that neighboring battery cells, the housing and / or the electronics of the battery pack will be thermally damaged.

The present invention is therefore based on the object of providing a battery pack for an electrical device and an electrical device with such a battery pack in which damage from escaping electrolyte gas in at least one defective and / or defective battery cell is avoided and / or reduced should, so that consequently the safety of the battery pack is improved and / or increased.

The stated object is achieved by a battery pack for an electrical device and by an electrical device with such a battery pack having the features of the independent claims. Further advantageous refinements and developments of the invention are specified in the respective dependent claims.

The invention relates to a battery pack for an electrical device. The battery pack includes a housing. The housing of the battery pack can be formed in one or more parts. In the case of a multi-part housing, this can comprise a lower housing shell and an upper housing shell.

The battery pack further comprises one or more battery cells with at least one positive pole arranged on the end face, the one or more battery cells being arranged within the housing. On the opposite end face, the one or more accumulator cells can each have a negative pole, i.e. the one or more accumulator cells can each have an end face with a positive pole and an end face with a negative pole. The one or more accumulator cells can be connected in parallel or in series.

The battery pack further comprises at least one lead carrier which is electrically connected to the one or more battery cells. The electrical conductor carrier can be formed by a printed circuit board or circuit board on which various electronic components, such as buttons, power mosfets, etc. are mounted for operating the battery pack. The electrical connection between the conductor carrier and the one or more accumulator cells can be formed, for example, by electrical contacting or by a contact element which rests against the poles of the one or more accumulator cells.

In the case of the battery pack, it is provided that at least one foam element is arranged and / or provided at least on the front side in the area or on the positive pole of the one or more battery cells. The at least one foam element is designed to at least largely decelerate and / or intercept at least one electrolyte gas exiting and / or escaping at high speed in the region of the positive pole from at least one defective and / or becoming defective accumulator cell. In particular, the emerging and / or escaping electrolyte gas can be extinguished by the at least one foam element. The electrolyte gas can emerge and / or escape in the form of an electrolyte gas jet in the region of the positive pole of the at least one defective and / or becoming defective accumulator cell.

The at least one electrolyte gas jet can then emerge and / or escape from the one or more accumulator cells in the region of the positive pole in particular when an internal cell pressure is in of a battery cell increases steadily and / or is too high due to a defect and / or temperatures that are too high.

It can be provided that the one or more accumulator cells each include a so-called current interrupt device (CID) at the end in the region of the positive pole. As soon as the maximum internal cell pressure is exceeded due to the formation of gas in the one or more accumulator cells, the CID can separate the connection between the electrode and the contact so that the electrolyte gas produced can escape from the respective accumulator cell. The opening of the CID and thus the emergence and / or escape of the electrolyte gas in the case of at least one defective and / or defective accumulator cell can occur in particular at a gas pressure between approx. 1.5 MPa and 3 MPa, preferably between approx. 1.9 MPa and 2.4 MPa.

It can also be provided that the one or more accumulator cells each include at least one safety valve at the front in the region of the positive pole, via which electrolyte gas that has arisen inside the cell can escape if the internal cell pressure is too high. This internal cell pressure can be roughly higher than the defined internal cell pressure in CID.

It is particularly advantageous that in the case of at least one defective and / or defective accumulator cell, the at least one electrolyte gas jet exiting at the positive pole is intercepted by the at least one foam element and is consequently reduced in speed. The reduction in the speed of the at least one electrolyte gas jet can advantageously contribute to protecting surrounding accumulator cells, the electronics and / or the housing of the accumulator pack from thermal damage. In this respect, the safety of the battery pack can be increased by the at least one foam element.

It can be provided that the at least one foam element is formed from a material which, in particular when the at least one electrolyte gas jet impinges, at least itself generates and / or releases a gas. This means so much that the at least one foam element can preferably be designed to be self-extinguishing and / or self-dissolving. By generating and / or releasing gas from the at least one foam element, surrounding oxygen can be bound and / or consumed and / or displaced. In this way, the risk can at least largely be reduced and / or prevented that, in the case of at least one defective and / or defective accumulator cell, the at least one electrolyte gas jet emerging and / or escaping in the region of the positive pole will come into contact with oxygen ignited, so that as a result surrounding accumulator cells and / or the housing and / or the electronics are not thermally damaged, ie the at least one foam element can be designed so that it extinguishes possible spark formation by the escaping and / or escaping electrolyte gas. In this respect, such a foam element can contribute to increasing the safety of the battery pack.

According to one embodiment, the at least one foam element can be arranged and / or provided at least in sections at the end on or in the region of the positive pole of the one or more accumulator cells, ie the at least one foam element can at least regionally the end face with the positive pole of the one or more accumulator cells cover and / or cover, in particular those areas of the end face or of the positive pole are covered by the at least one foam element, in which an exit and / or escape of the electrolyte gas jet in the case of a defective and / or defective accumulator cell is very likely is expected. Such an arrangement of the at least one foam element can advantageously increase the safety of the battery pack, since thermal damage due to a possible escaping and / or escaping electrolyte gas jet of at least one defective and / or defective battery cell is reduced.

In order to further increase the safety of the battery pack, it can also be conceivable according to a preferred embodiment that the at least one foam element is arranged and / or provided completely over the end face with the positive pole of the one or more accumulator cells, ie the end face with the positive one Pole of the one or more accumulator cells can be at least completely covered by the at least one foam element. Such an arrangement can preferably also cover those areas on the end face with the positive pole of the one or more accumulator cells in which the likelihood of the electrolyte gas jet emerging and / or escaping is lower.

According to one embodiment, it can be provided that the at least one foam element is formed from a plastic material to which at least one additive has been added which has flame-retardant properties.

Polyurethane, polyethylene, polystyrene or the like, for example, can be used as the plastic material. This selection of However, plastic materials should not be understood as limiting. Because the at least one foam element can also be formed by any further plastic materials.

All halogenated flame retardants such as, for example, polybrominated diphenyl ethers, biphenyls, and / or inorganic flame retardants or the like can be suitable as additives with flame-retardant properties.

According to a further exemplary embodiment, it can be provided that the at least one foam element itself is formed from a flame-retardant material, wherein the flame-retardant material can be formed by all flame retardants, in particular reactive flame retardants, which are particularly suitable for slowing down the electrolyte gas and / or to extinguish. These include, for example, all halogenated and / or inorganic flame retardants or similar flame retardants.

It can be provided that the at least one foam element is provided and / or arranged at least between the end face with the positive pole of the one or more accumulator cells and an inner wall of the housing. The at least one foam element can also help ensure that the one or more accumulator cells do not slip within the housing. In addition, the at least one foam element can also act as shock and / or damping protection and protect the one or more accumulator cells from external forces, such as impacts, impacts or the like. In particular, the at least one foam element can be designed in such a way that it can absorb impacts acting axially on the battery pack.

According to one embodiment, the at least one foam element can extend at least in sections along the longitudinal side of the housing inner wall of the housing, so that the at least one foam element is arranged and / or provided between the end faces of the one or more accumulator cells and the inner wall longitudinal side of the housing.

According to a preferred embodiment, the at least one foam element can extend completely along the longitudinal side of the housing inner wall, so that the at least one foam element is arranged and / or provided between the end sides of the one or more accumulator cells and the longitudinal side of the housing inner wall. In this embodiment, it can inevitably also arise that the at least one foam element is provided and / or arranged on the front side on the positive poles and on the negative poles of the one or more accumulator cells.

In one embodiment, the plurality of accumulator cells can each be arranged within the housing in such a way that their end faces are each approximately at the same height. Depending on the number of accumulator cells, one or more foam elements can thus be provided, each of which is arranged on the end face, preferably in the area of or on the positive pole, on or in the area of the accumulator cells. Such an arrangement of the plurality of accumulator cells and the corresponding number of accumulator cells can be implemented quickly and easily without great effort.

In one embodiment, the preferably several accumulator cells can each be arranged offset from one another with respect to their length within the housing, i.e. the several accumulator cells can be arranged parallel with respect to their longitudinal axis, but shifted or offset from one another with respect to their longitudinal axis. In this respect, with such an arrangement of the accumulator cells it can make sense that the at least one foam element is only arranged and / or provided on the end faces with the positive pole of the one or more accumulator cells. In this embodiment, material for the at least one foam element can be arranged.

Furthermore, it can be provided that the at least one foam element is arranged at a distance from the end faces, in particular the positive pole, from the one or more accumulator cells. The distance, however, should in particular be made as small as possible in order to keep possible dangers, in particular reactions with the oxygen present, due to the electrolyte gas jet as low as possible.

Preferably, it can also be conceivable that the at least one foam element rests directly on the end face against the positive pole of the one or more accumulator cells. Between the positive pole and the at least one foam element, only the contact or the contact element provided on the positive pole can be interposed, via which the one or more accumulator cells are electrically connected to the lead carrier. By such an arrangement, the at least one electrolyte gas jet of at least one defective and / or becoming defective accumulator cell can be intercepted by the at least one foam element immediately after its escape and / or exit in the region of the positive pole, so that an ignition of the at least one electrolyte gas jet is at least largely prevented and / or reduced by contact with surrounding oxygen.

Furthermore, it can be provided that the at least one foam element is formed by at least one foam layer. The at least one foam layer can, for example, have a thickness between approx. 1 mm and approx. 15 mm, preferably 2 mm.

Alternatively, the at least one foam element can be formed by at least two or more foam layers. According to one embodiment, the at least two or more foam layers can each be formed from the same material, which is designed to slow down the electrolyte gas jet emerging and / or escaping in the region of the positive pole in the case of at least one defective and / or defective accumulator cell and which is designed to be self-dissolving and / or self-extinguishing due to its flame-retardant properties.

According to a further exemplary embodiment, it can also be conceivable that the at least two or more foam layers are formed from different materials. In this case, the first foam layer facing the positive pole of the one or more accumulator cells can be formed from the aforementioned flame-retardant material. The second foam layer or the plurality of foam layers can function as a carrier to which the first foam layer can be attached and / or fixed. The second foam layer or the plurality of foam layers can be formed by a plastic material, composite material or the like. Polyurethane, polyethylene, polystyrene, for example, can be conceivable as plastic material.

In addition, it can also be conceivable that the plastic material of the second or more foam layers are mixed with at least one additive which likewise has fire and / or flame retardant properties. For example, all halogenated and / or inorganic flame retardants or similar flame retardants would be conceivable as additives.

In addition, it can also be conceivable that the at least two or more foam layers have the same layer thickness. Accordingly, the at least two or more foam layers can have the same thickness.

Alternatively, it can also be conceivable that the at least two or more foam layers have a different layer thickness. For example, the first foam layer facing the positive pole can be made thicker compared to the further foam layers adjoining it. Alternatively, the foam layer facing the positive pole can also be made thinner compared to the further foam layers adjoining it.

Furthermore, it can be provided that the housing of the battery pack is formed from a plastic material which is provided with at least one additive which is flame retardant. Materials, for example halogenated and / or inorganic flame retardants or similar flame retardants, can be conceivable as additives.

Furthermore, it can be provided that the at least one foam element comprises at least one or more cutouts. The one or more recesses can be required, for example, so that possible plug connections of the housing, in particular the lower housing shell, can be passed through.

In addition, it can also be conceivable that the at least one foam element is already prefabricated, which is or can be inserted at least between the end faces with the positive pole of the one or more accumulator cells, ie the at least one foam element can be produced in advance by appropriate foaming processes and / or will.

Alternatively, it can also be conceivable that the at least one foam element can be foamed at least on the front side between the positive pole of the one or more accumulator cells and the inner wall of the housing. In this way, intermediate and / or cavities can be filled at least between the end face with the positive pole and partially also with the negative pole of the one or more accumulator cells and the housing inner wall of the housing.

Furthermore, it can also be conceivable that the at least one foam element is foamed and / or can be produced under protective gas. For example, nitrogen, bromine-containing gases, noble gases and / or helium can be conceivable as protective gases.

Furthermore, it can be provided that the at least one foam element is formed by an open-cell foam. Such a foam element can be designed in such a way that the exiting and / or escaping electrolyte gas is largely braked, but the electrolyte gas can at least largely pass through the at least one foam element, although the ignitability of the Electrolyte gas can be reduced and / or restricted.

Alternatively, it can be provided that the at least one foam element is formed by a closed-cell foam. Such a foam element can be designed in such a way that the emerging and / or escaping electrolyte gas is largely decelerated, the pores of the foam element being destroyed at the same time. In this way, for example foamed-in protective gas can be released.

If the at least one foam element is formed by at least two or more foam layers, it can also be conceivable that at least one layer is formed from an open-cell foam and at least one further layer is formed from a closed-cell foam.

Furthermore, it can be provided that the battery pack is formed by a lithium-ion battery pack. The one or more accumulator cells can be formed by lithium-ion cells. The one or more battery cells of the battery pack can be connected in parallel or in series.

The one or more lithium-ion cells can preferably have a cylindrical structure. The one or more lithium-ion cells can each have two electrodes, which can be referred to as an anode and a cathode. Between the electrodes, in particular the anode and the cathode, an electrolyte can be provided which is designed to be ion-conductive. The electrolyte can be solid or liquid. Alternatively, the electrolyte can also be formed by a polymer.

In addition, a separator can be arranged between the anode and the cathode, which ensures the separation of the electrodes.

The cell-chemical system of the one or more lithium-ion accumulator cells can, for example, be a lithium-ion-cobalt system, lithium-nickel-manganese-cobalt system, lithium-nickel-cobalt-aluminum system, lithium-manganese system , Lithium iron phosphate system or a lithium titanate system. Depending on the cell chemistry, the electrodes, in particular the anode and the cathode, and the separators can be formed from different materials.

Furthermore, it can be conceivable that the battery pack has a nominal voltage between approximately 10 volts and approximately 120 volts, preferably between approximately 16 volts and approximately 24 volts.

The invention further relates to an electrical device with a battery pack, which is designed according to one of claims 1 to 11.

The electrical device can, for example, be a device that is to be supplied with electrical energy by the battery pack. The electrical device can be, for example, an electrical tool for the workshop and / or garden area, a household appliance or driving and / or play equipment.

• 1 zeigt in einer schematischen Perspektivansicht eine mögliche Ausführungsform eines Akkupacks.
• 2 zeigt in einer schematischen Perspektivansicht eine mögliche Ausführungsform eines Akkupacks.
• 3 zeigt in einer vereinfachten schematischen Draufsicht eine mögliche Anordnung der Akkumulatorzellen und des wenigstens einen Schaumstoffelements innerhalb der Gehäuseunterschale.
• 4 zeigt in einer vereinfachten schematischen Draufsicht eine weitere Anordnung der Akkumulatorzellen und des wenigstens einen Schaumstoffelements innerhalb der Gehäuseunterschale.

In the following, exemplary embodiments are intended to explain the invention and its advantages in more detail with reference to the accompanying figures. The proportions of the individual elements to one another in the figures do not always correspond to the real proportions, since some forms are simplified and other forms are shown enlarged in relation to other elements for better illustration.

• 1 shows a possible embodiment of a battery pack in a schematic perspective view.
• 2 shows a possible embodiment of a battery pack in a schematic perspective view.
• 3 shows in a simplified schematic plan view a possible arrangement of the accumulator cells and the at least one foam element within the lower housing shell.
• 4th shows a simplified schematic plan view of a further arrangement of the accumulator cells and the at least one foam element within the lower housing shell.

Identical reference symbols are used for elements of the invention that are the same or have the same effect. Furthermore, for the sake of clarity, only reference symbols are shown in the individual figures which are necessary for the description of the respective figure. The illustrated embodiments merely represent examples of how the battery pack can be designed and do not represent a final limitation.

The 1 shows a possible embodiment of a battery pack in a schematic perspective view 10 for an electrical device not shown here. The battery pack 10 is formed in particular by a lithium-ion battery pack and has a nominal voltage between approx. 10 volts and approx. 120 volts, preferably between approx. 16 volts and approx. 24 volts.

The electrical device can, for example, be an electrical tool for the area Workshop and / or garden, a household appliance or driving and / or play equipment.

The battery pack 10 comprises a housing which has a lower housing shell 12th and a housing upper shell, not shown here. The lower case 12th consists of two shell parts 14th , 14 ' which can be connected to one another by non-illustrated positive and / or positive connections. The housing of the battery pack 10 is formed from a plastic material which is provided with at least one additive which is flame retardant. Materials such as halogenated and / or inorganic flame retardants or similar flame retardants can be conceivable as additives.

In the lower housing shell 12th are several accumulator cells 16 arranged, which are each formed by lithium-ion cells. The accumulator cells 16 are in the lower case 12th Arranged in two rows, with five battery cells in each row 16 are arranged.

The accumulator cells 16 each have a cylindrical structure. The accumulator cells 16 each have two electrodes, not shown here, which are referred to as an anode and a cathode. Between the electrodes, in particular the anode and the cathode, an electrolyte (also not shown) is provided, which is designed to conduct ions. The electrolyte can be liquid. Alternatively, the electrolyte can also be solid or formed by a polymer. A separator, not shown here, which ensures the separation of the electrodes, is arranged between the anode and the cathode.

The accumulator cells 16 each have a positive pole at the front (see reference number 24 in the 3 and 4th ) and opposite to this on the face side a negative pole (see reference number 26th in the 3 and 4th ) on. The accumulator cells 16 are each arranged within the housing so that the positive pole 24 and negative pole 26th alternate.

The battery pack also includes 10 at least one conductor 18th , which with the accumulator cells 16 is electrically connected. The electrical connection between the battery cells 16 takes place through contacts or contact elements 28 each at the poles, especially at the positive pole 24 , the accumulator cells 16 issue. The electrical conductor carrier 18th is formed by a printed circuit board or circuit board on which various electronic components such as buttons, power mosfets, etc. for operating the battery pack 10 are mounted.

Is an accumulator cell 16 defective and / or if the temperature is too high, the internal cell pressure rises due to electrolyte gas formation in the respective accumulator cell 16 at. To get this gas from inside the accumulator cell 16 To be able to escape, show the accumulator cells 16 each has several safety devices. In the area of the positive pole 24 show the accumulator cells 16 in each case at least one safety valve, not shown here, via which electrolyte gas that has arisen inside the cell can escape when the cell pressure increases. It is also in the area of the positive pole 24 a so-called. Current Interrupt Device (CID) is provided, which when a certain internal cell pressure is exceeded by electrolyte gas formation, the connection between the electrode and the contact or contact element 28 separates, so that the resulting electrolyte gas in the form of an electrolyte gas jet from the respective accumulator cell 16 can escape. The CID releases the electrolyte gas formed inside the cell at an internal cell pressure between approx. 1.5 MPa and approx. 3 MPa, preferably between approx. 1.9 MPa and 2.4 MPa.

The escape and / or escape of the electrolyte gas in the area of the positive pole 24 occurs at high speed. To the surrounding battery cells 16 as well as the housing of the battery pack 10 Protecting against thermal damage or the like is at least on the end faces, preferably in the area of the positive poles 24 , the accumulator cells 16 one foam element each 20th , 20 ' intended. The foam element 20th , 20 ' is designed to respond to a defective and / or defective accumulator cell 16 those in the area of the positive pole 24 at least largely to decelerate and / or intercept escaping and / or emerging electrolyte gas jet, ie by the at least one foam element 20th , 20 ' becomes the speed of the in the area of the positive pole 24 escaping and / or exiting electrolyte gas jet reduced and / or slowed down.

The at least one foam element 20th , 20 ' is formed by a foam layer which has a thickness between approx. 1 mm and 10 mm, preferably 2 mm. The at least one foam element 20th , 20 ' is formed by a plastic material, which is mixed with at least one additive, which is designed to be self-dissolving and / or self-extinguishing due to its flame-retardant properties. This includes all additives of halogenated and / or inorganic flame retardants or similar flame retardants. Alternatively, the at least one foam element can be used 20th , 20 ' also be formed by the flame retardant material itself.

The at least one foam element 20th , 20 ' is designed such that when the at least one electrolyte gas jet impinges it itself generates at least one gas and consequently dissolves itself and / or is self-extinguishing. By the gas generation of the at least one foam element 20th , 20 ' the surrounding oxygen is bound, consumed and / or displaced, so that the danger and / or the risk is lowered and / or reduced that the escaping and / or escaping electrolyte gas jet ignites on contact with oxygen. As a result, the risk of surrounding accumulator cells is also reduced at the same time 16 , the electronics and / or the housing are thermally damaged.

Like it from the 1 is apparent, that is at least one foam element 20th , 20 ' between the two end faces with the positive pole 24 and the negative pole of the accumulator cells 16 and the housing inner wall of the housing, wherein the at least one foam element 20th , 20 ' Extends completely over the entire longitudinal side and / or surface of the accumulator front sides and the inside of the housing.

In addition, the at least one foam element carries 20th , 20 ' also contributes to the fact that the multiple accumulator cells 16 Do not slip inside the housing. The at least one foam element also functions 20th , 20 ' also as shock and / or damping protection and protects the battery cells 16 against external forces, such as impacts, impacts or the like. The at least one foam element 20th , 20 ' can especially axially on the battery pack 10 absorb impacts.

With the present 1 is the at least one foam element 20th , 20 ' already prefabricated, and at least between the end faces, especially the positive poles 24 , the accumulator cells 16 used, ie the at least one foam element 20th , 20 ' can be and / or be produced in advance by appropriate foaming processes.

Alternatively, it can also be conceivable that the at least one foam element 20th , 20 ' at least on the front side on the positive pole of the one or more accumulator cells 16 is foamable. In this way, intermediate spaces and / or cavities can be formed through the at least one foam element 20th , 20 ' be filled.

The at least one foam element 20th , 20 ' here comprises two recesses through which plug connections, not shown here, of the shell part 14th are led. The at least two recesses 22nd with the reference number 20th The foam elements marked are identical and are at least approximately square and / or star-shaped. The at least two recesses 22nd , 22 ' with the reference number 20 ' marked foam element are designed differently, since here the plug connections of the shell part 14 ' are designed differently, so that a recess as a result 22nd at least approximately square and / or star-shaped and the other recess 22 ' is formed at least approximately triangular.

In the 2 is a further embodiment of the battery pack 10 shown, this embodiment being opposite 1 only through the design of the at least one foam element 20th , 20 ' differs. So through the 2 clearly that the at least one foam element 20th , 20 ' next to the at least two recesses 22nd , 22 ' a plurality of further recesses 23 for the plug connections. The further recesses can be designed as desired.

In the 3 is a simplified representation of a schematic plan view of a possible arrangement of the accumulator cells 16 and the at least one foam element 20th , 20 ' in the lower housing shell 12th shown, as it is also in the embodiment according to 1 the case is. All features and / or designs for 1 should consequently also with the in 3 The schematic arrangement shown may be included and / or included.

With the battery cells shown here 16 it is the bottom row of the in 1 provided two-row accumulator cell arrangement. Here are in the lower housing shell 12th five battery cells 16 arranged, each of which has a positive pole on one end face 24 and a negative pole on the opposite end 26th exhibit. In addition, the accumulator cells 16 in the lower housing shell 12th each arranged parallel to one another with respect to their longitudinal axis, the end faces of which are each arranged at least approximately at the same height.

In addition, the accumulators 16 each arranged so that the poles of the accumulator cells 16 alternate. This means that the end faces with the positive poles 24 and the negative poles 26th are each arranged offset to one another. To the poles 24 , 26th of the accumulator cells 16 there are contacts or contact elements that are not shown here 28 (see. 1 and 2 ) over which the battery cells 16 with the leader 18th are electrically connected.

Through the 3 it becomes clear that the at least one foam element 20th , 20 ' each between the end faces of the accumulator cells 16 and the housing inner wall of the housing, in particular the housing lower shell 12th are provided and / or arranged. The at least one foam element 20th , 20 ' thus extends continuously along the longitudinal side of the housing inner wall of the housing lower shell 12th .

Because that's at least one foam element 20th , 20 ' especially on the front of the positive poles 24 of the accumulator cells 16 is provided and / or arranged, can in the region of the positive pole 24 escaping and / or escaping electrolyte gases through the at least one foam element 20th , 20 ' be intercepted. Due to the special design of the at least one foam element 20th , 20 ' generates the at least one foam element 20th , 20 ' when the at least one electrolyte gas jet impinges, at least one gas itself, since the at least one foam element 20th , 20 ' is designed to be self-extinguishing and / or self-dissolving. At the same time, the gas generation of the at least one foam element 20th , 20 ' surrounding oxygen bound, consumed and / or displaced. In this way, with at least one defective and / or defective accumulator cell 16 at least largely reduces the risk that the at least one is at the positive pole 24 escaping and / or escaping electrolyte gas jet ignited on contact with oxygen, so that as a result, surrounding accumulator cells 16 , the electronics and / or the housing are not thermally damaged. In this respect, such a foam element can contribute to increasing the safety of the battery pack.

In addition, through 3 also clearly again that the battery cells 16 through the at least one foam element 20th , 20 ' be held in place. Because of the embedding on both sides, the at least one foam element functions 20th , 20 ' as optimal shock and / or damping protection and protects the battery cells 16 against external forces, such as impacts, impacts or the like.

In the 4th is a simplified illustration of a further schematic plan view of an open battery pack 10 shown, with the battery cells 16 and the at least one foam element 20th inside the lower housing shell 12th in contrast to 3 are arranged according to an alternative variant.

In the lower housing shell 12th are five accumulator cells 16 arranged, which shows the first row of a two-row accumulator cell arrangement. The accumulator cells 16 each have a positive pole 24 and a negative pole on the opposite end 26th on. The accumulator cells 16 are inside the lower housing shell 12th are arranged parallel to one another with respect to the longitudinal axis, but are arranged offset to one another with respect to their end faces.

In addition, the accumulator cells 16 in the lower housing shell 12th each arranged parallel to one another such that their poles are arranged alternately. This means that the end faces with the positive poles 24 and the negative poles 26th are each arranged offset to one another. At the poles of the battery cells 16 are contacts not shown here 28 (see. 1 and 2 ) over which the battery cells 16 with the leader 18th are electrically connected.

In contrast to 2 is the at least one foam element 20th only on the end face with the positive pole of the accumulator cells 16 arranged. Due to the odd number of battery cells 16 are on one long side of the battery pack 10 two positive poles 24 and accordingly on two foam elements 20th and on the opposite long side three positive poles 24 and accordingly three foam elements 20th intended. In particular, this is at least one foam element 20th each between the end face with the positive pole 24 of the accumulator cells 16 and the housing inner wall of the housing lower shell 12th arranged. In this embodiment of the battery pack 10 Costs can be saved because there is less material for the at least one foam element 20th is needed.

The invention has been described with reference to a preferred embodiment. However, it is conceivable for a person skilled in the art that modifications or changes can be made to the invention without departing from the scope of protection of the following claims.

List of reference symbols

10

Battery pack

12

Housing lower shell

14th

Shell part

14 '

Shell part

16

Accumulator cell

18th

Leadership

20th

Foam element

20 '

Foam element

22nd

Recess

22 '

Recess

24

positive pole

26th

negative pole

28

Contacting, contact element

Claims (12)

At least comprising battery pack (10) for an electrical device - a housing, - One or more accumulator cells (16) with at least one positive pole (24) arranged at the end, wherein the one or more accumulator cells (16) are arranged inside the housing, - At least one conductor carrier (18) which is electrically connected to the one or more accumulator cells (16), - It is provided that at least one foam element (20) is arranged and / or provided at least on the front side in the region of the positive pole (24) of the one or more accumulator cells (16), which foam element is designed to remove at least one defective and / or defective to at least largely intercept and / or extinguish at least one electrolyte gas emerging and / or escaping at high speed in the region of the positive pole (24). Battery pack Claim 1 , in which the at least one foam element (20) is formed from a material which is designed to be self-extinguishing in particular when the at least one electrolyte gas jet impinges and itself generates and / or releases at least one gas. Battery pack Claim 1 or 2 , in which the at least one foam element (20) is formed from a plastic material which is mixed with at least one additive which has flame-retardant properties. Battery pack Claim 1 or 2 , in which the at least one foam element (20) is itself formed from a flame-retardant material. Battery pack Claim 4 , in which the at least one foam element (20) is formed from halogenated and / or inorganic flame retardants or the like. Battery pack according to one of the preceding claims, in which the at least one foam element (20) is provided and / or arranged at least between the end face with the positive pole (24) of the one or more battery cells (16) and an inner wall of the housing. Battery pack according to one of the preceding claims, in which the at least one foam element (20) is formed by at least one foam layer. Battery pack after at least one of the previous ones Claims 1 to 6th , in which the at least one foam element (20) comprises at least two or more foam layers. Battery pack according to one of the preceding claims, in which the at least one foam element (20) comprises at least one or more recesses (22). Battery pack according to one of the preceding claims, in which the at least one foam element (20) is already prefabricated. Battery pack according to one of the Claims 1 to 9 , in which the at least one foam element (20) can be foamed at least at the end between the region of the positive pole (20) of the one or more accumulator cells (16) and the inner wall of the housing. Electrical device with a battery pack according to one of the previous ones Claims 1 to 11 .

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