Method for filling a battery tray of a traction battery with a ballast filling

Abstract

The invention relates to a method for filling a battery tray (2) of a traction battery, in particular a lithium-ion traction battery, for a mobile work machine, in particular an industrial truck, with a ballast filling (3), wherein a filling chamber (7) of the battery tray (2) is filled with the ballast filling (3) in a filling process. During the filling process, a density control (DR) process, in particular a continuous density control process, is carried out for the battery tray (2) filled with the ballast filling (3).

Description

[0001] 24325 / P24026-DEa / KBS= EM-KBS004

[0002] February 13, 2025 - Geirhos

[0003] 1

[0004] Description

[0005] Method for filling a battery tray of a traction battery with ballast

[0006] The invention relates to a method for filling a battery trough of a traction battery, in particular a lithium-ion traction battery, for a mobile working machine, in particular a forklift truck, with a ballast filling, wherein a filling chamber of the battery trough is filled with the ballast filling in a filling process.

[0007] A mobile work machine powered by a battery-electric drive, in particular a battery-electric industrial truck, for example a battery-electric counterbalance forklift, has a traction battery to provide the electrical drive energy. The traction battery has a battery tray in which one or more battery modules are installed. In known battery-electric industrial trucks, the traction battery is usually designed to be replaceable, so that a discharged traction battery can be easily replaced with a charged one during operation of the industrial truck.

[0008] Electrically powered industrial trucks, such as counterbalance forklifts, have a lifting mast with a load-handling device, such as a fork, on the front axle. The stability of such trucks with a load is crucially determined by the vehicle's overall center of gravity, which in turn depends on the position of the counterweight, as well as the position and weight of the traction battery.

[0009] Conventional traction batteries are relatively heavy lead-acid batteries that contribute significantly to the counter-torque against a load in the forklift. To prevent unstable conditions and the risk of the forklift tipping over, as well as during braking, the vehicle's weight and center of gravity are crucial. 24325 / P24026-DEa / KBS= EM-KBS004

[0010] February 13, 2025 - Geirhos

[0011] 2

[0012] Newer technologies now allow for the production and industrial use of batteries and accumulators that offer improved performance. These batteries can be described as high-performance batteries, characterized by a higher energy density relative to weight and / or volume compared to lead-acid batteries, and by the use of a different energy storage technology than a lead-acid reaction. Many high-performance batteries also feature the ability to deliver high power during discharge and / or charge at high power. The typical energy densities relative to weight and / or volume of a high-performance battery are higher than, and outside the range of, the corresponding parameters for lead-acid batteries, at least for one of these two values.

[0013] Lithium-ion batteries, which have achieved a level of reliability suitable for mass production, are increasingly being used on a larger scale than such high-performance batteries. They are characterized by high energy density, have only a low memory effect, and allow for high-power discharge and charging of the battery.

[0014] The use of such high-performance batteries is particularly advantageous in mobile machinery, for example industrial trucks, as traction batteries, because due to the high energy density in relation to the volume, a larger amount of electrical energy can be stored in the given installation space for the traction battery, thus increasing the range of a vehicle or the operating time of the industrial truck.

[0015] Battery-electric industrial trucks that use lithium-ion traction batteries as high-performance batteries, with lithium-ion battery modules installed in the battery tray, have the disadvantage that the lower weight of the lithium-ion traction battery compared to a lead-acid traction battery (with lead-acid battery modules installed in the battery tray) alters the center of gravity of the entire industrial truck, thus affecting its stability and load-bearing capacity. 24325 / P24026-DEa / KBS= EM-KBS004

[0016] February 13, 2025 - Geirhos

[0017] 3

[0018] Therefore, there is a need to align the weight of a lithium-ion traction battery with the weight of a lead-acid traction battery with the same external dimensions of the battery tray, so that a lead-acid traction battery can be replaced by a lithium-ion traction battery in the industrial truck without affecting the load-bearing capacity and stability of the industrial truck.

[0019] It is known from DE 102014 106644 B4 to attach a plate-shaped additional weight to the outside of the battery tray of a lithium-ion traction battery of a forklift truck using fasteners, in order to equalize the weight of the lithium-ion traction battery with that of a lead-acid traction battery with the same size battery tray. However, such a plate-shaped additional weight and the required fasteners result in a high degree of construction complexity.

[0020] To increase the weight of a lithium-ion traction battery for a mobile work machine, it is also possible to fill a filling chamber of the battery trough of the traction battery with ballast as additional weight in a single filling process using a filling device.The mass of the ballast filling in the battery tray is preferably selected such that the weight of the battery tray containing the ballast, in which lithium-ion battery modules are installed, and thus the weight of a lithium-ion traction battery with the battery tray containing the ballast, is adapted and aligned with the weight of a lead-acid traction battery with the same external dimensions of the battery tray, so that in a forklift truck, a lead-acid traction battery can be replaced by a lithium-ion traction battery produced from the battery tray containing the ballast without impairing the load-bearing capacity and stability of the forklift truck.

[0021] In the case of traction batteries for industrial trucks, battery trays of varying sizes, standardized in their dimensions, are known. These trays, used in the production of lithium-ion traction batteries, have differently sized filling chambers for ballast. To match the weight of a lead-acid traction battery with the same size battery tray, different weights of ballast are required as additional weights, which are formed by the corresponding ballast filling in the filling chamber. If crushed metal parts are used as ballast, 24325 / P24026-DEa / KBS= EM-KBS004

[0022] February 13, 2025 - Geirhos

[0023] 4. When using known filling devices, a high degree of adjustment is required to fill a specific battery tray with a predetermined filling space with suitable metal parts in such a way that a required target mass of the battery tray filled with ballast is achieved, which aligns a lithium-ion traction battery produced from the battery tray filled with ballast to the weight of a lead-acid traction battery with the same size battery tray.

[0024] The present invention is based on the objective of providing a method for filling a battery trough with ballast, which makes it possible in a simple way to provide a required target mass of the battery trough filled with ballast for battery troughs of different sizes.

[0025] This problem is solved according to the invention by a method for filling a battery trough of a traction battery, in particular a lithium-ion traction battery, for a mobile working machine, in particular a forklift truck, with a ballast filling, wherein a filling chamber of the battery trough is filled with the ballast filling in a filling process, in which a density control, in particular a continuous density control, of the battery trough filled with the ballast filling is carried out during the filling process.

[0026] In the inventive method, the ballast filling is preferably composed of at least two variants of ballast materials having different densities.

[0027] A density control system allows for the simple control and regulation of the filling of the battery trough with suitable ballast material during the filling process. This ensures that, at the end of the process, the filled battery trough has the required target mass. This mass is necessary for a lithium-ion traction battery produced from this trough to be equivalent in weight to a lead-acid traction battery with the same sized battery trough. Continuous density control, in particular, is a density control system that performs density adjustments at regular intervals throughout the filling process of the battery trough's ballast material. 24325 / P24026-DEa / KBS= EM-KBS004

[0028] February 13, 2025 - Geirhos

[0029] 5

[0030] According to an advantageous embodiment of the invention, a target volume of the filling space and a target mass of the battery trough filled with ballast are determined based on the battery trough to be filled, and a target density is determined from the target volume and the target mass. The battery trough to be decomposed thus defines and specifies the target volume of the filling space to be decomposed with the ballast, as well as a required target mass. The target mass here represents the mass of the battery trough filled with ballast. The target mass of the battery trough filled with ballast is preferably selected such that the weight of a lithium-ion traction battery produced from the battery trough filled with ballast is comparable to the weight of a lead-acid traction battery with an equally sized battery trough.

[0031] According to an advantageous embodiment of the invention, the actual mass of the battery trough filled with ballast is determined during the filling process, particularly continuously, and the actual density is also determined. The actual mass is preferably measured using a weighing device that continuously measures the weight of the battery trough with the ballast during the filling process. The actual density can then be determined from the measured actual mass in conjunction with the target volume of the filling chamber or the volume of the filling chamber that is not yet filled.

[0032] According to an advantageous embodiment of the invention, an input variable for a controller is determined from the target density and the actual density. Depending on the target density and the actual density determined from the measured actual mass, the density is calculated that represents the input variable for the controller with a control loop of the total density of the ballast filling.

[0033] According to an advantageous embodiment of the invention, the controller adjusts and sets the composition of the ballast filling from at least two variants of ballast materials with different densities during the filling process, depending on the input parameter. Depending on the input parameter and the available different ballast materials, which differ in density and size, the controller sets the specific composition of the ballast filling to be applied from the different variants of the ballast materials, i.e., the mixture of the materials described in 24325 / P24026-DEa / KBS= EM-KBS004

[0034] February 13, 2025 - Geirhos

[0035] 6. Ballast filling to be added to the filling chamber, consisting of different variants of ballast material with different densities.

[0036] According to an advantageous embodiment of the invention, metal parts and / or slag with at least two different densities are used as ballast materials. The metal parts are preferably shredded metal parts that differ in size and thus have different densities (weight per unit volume). These metal parts, differing in size, can preferably be produced from scrap metal, for example, iron or steel scrap, using suitable metal shredders. By appropriately mixing the metal parts with different sizes and thus different densities in various proportions, the density of the ballast material filled into the filling chamber can be easily adjusted and changed during density control.Alternatively or additionally, crushed slag from the steel industry, in particular slag from iron or steel production, so-called blast furnace slag or steelworks slag, can be used as ballast material, which is crushed into metal parts in the form of granules using suitable metal shredders.

[0037] The invention further relates to a filling device configured to fill a filling chamber of a battery trough of a traction battery, in particular a lithium-ion traction battery, for a mobile working machine, in particular a forklift truck, with ballast in a filling process, wherein the filling device comprises a weighing device configured to detect, in particular continuously detect, the weight of the battery trough together with the ballast during the filling process, and comprises at least two storage containers for two variants of ballast materials of different densities, wherein the filling device has an electronic control device that performs the aforementioned density control during the filling process of the battery trough.With such a filling device, the density control according to the invention can be implemented in a simple manner during the filling process of the filling chamber of the battery trough with ballast material.

[0038] According to an advantageous embodiment of the invention, the electronic control unit is provided with an input interface configured for a 24325 / P24026-DEa / KBS= EM-KBS004

[0039] February 13, 2025 - Geirhos

[0040] 7. During the filling process, the battery tray to be filled with ballast is used to obtain a target volume of the filling chamber and a target mass of the battery tray filled with ballast. A battery tray from which a lithium-ion traction battery is manufactured defines the target volume of the filling chamber and a required target mass of the battery tray filled with ballast. From the target volume of the filling chamber and the target mass of the battery tray filled with ballast, the target density can then be easily determined by the electronic control unit.The target volume and mass of the filling chamber can be provided to the electronic control unit by a higher-level process controller at the input interface, or the electronic control unit can read this information from a data carrier attached to the battery tray, such as a barcode, on which the target volume and mass are stored, using a suitable reader as an input interface. Alternatively, the target volume and mass of the filling chamber can be entered manually at an input interface designed as a keyboard for the battery tray currently being filled.

[0041] According to an advantageous embodiment of the invention, the electronic control unit is provided with an input interface configured to receive the size and / or density of each ballast material variant. This information can be provided to the electronic control unit by a higher-level process controller at the input interface or, alternatively, entered manually at an input interface configured as a keyboard. Using this information regarding the size and / or density of each ballast material variant, the electronic control unit can easily determine a specific composition of the ballast filling to be disposed of from the different ballast material variants.A mixture of the ballast filling to be poured into the filling chamber, consisting of the different variants of ballast material, is provided in order to achieve the required target density after the filling process of the battery trough.

[0042] The electronic control unit thus receives, in a simple manner, as input parameters for density control, the target volume of the filling space of the battery trough to be disposed of, the target mass of the 24325 / P24026-DEa / KBS= EM-KBS004 filled with ballast.

[0043] February 13, 2025 - Geirhos

[0044] 8

[0045] Battery troughs and the size and / or density of the different variants of ballast material used for ballast filling, as well as the actual mass and the resulting actual density from the weight measurement.

[0046] According to an advantageous embodiment of the invention, each storage container is provided with a discharge opening that can be controlled by the electronic control unit. The discharge opening is designed to dispense ballast material from the storage container for filling the battery trough. Thus, by appropriately controlling the discharge openings on the storage containers during density control, the specific composition of the ballast to be discharged can be easily adjusted from the different variants of ballast materials.

[0047] The discharge opening of the respective storage containers can preferably include a discharge gate, for example a flap or a rotary valve. This also enables the electronic control unit to continuously determine the volume of ballast material already filled into the filling chamber during the filling process.

[0048] The invention further relates to a lithium-ion traction battery for a mobile working machine, in particular a forklift truck, using a battery trough produced according to the above-mentioned method, wherein at least one lithium-ion battery module is installed in the battery trough provided with the ballast filling.

[0049] The invention offers a number of advantages.

[0050] The invention enables a high degree of automation of the filling process through continuous weighing of the battery tray during filling, continuous comparison of the target and actual density during filling, and continuous adjustment of the composition of the ballast material being filled into the filling chamber from the various ballast material variants during filling. 24325 / P24026-DEa / KBS= EM-KBS004 13.02.2025 - Geirhos

[0051] 9

[0052] A reduction in the filling process duration is achieved by directly controlling the amount of filling material by comparing the target and actual density.

[0053] The invention makes it possible to use ballast materials that exhibit high variability in size, for example, particle size or grain size, and / or density. This allows for the use of cost-effective ballast materials as ballast filling for the battery tray.

[0054] The density of the ballast filling into the filling chamber of the battery trough during the filling process can be dynamically adjusted during the process, for example to set an optimal particle size interface ratio.

[0055] Further advantages and details of the invention are explained in more detail with reference to the exemplary embodiment shown in the schematic figures. Here,

[0056] Figure 1 shows a schematic representation of a filling device according to the invention for filling a battery tray of a traction battery with ballast and

[0057] Figure 2 shows a block diagram of the method carried out with the filling device according to the invention.

[0058] Figure 1 shows a filling device 1 with which a battery tray 2 of a traction battery, for example a lithium-ion traction battery, for a mobile work machine, in particular a forklift truck, is at least partially filled with ballast 3 to increase its weight in a single filling operation. With the filling device 1, the battery tray 2 is at least partially filled with ballast material 3a as ballast 3.

[0059] The battery tray 2 has an outer shell 6 with an outer wall 5. In Figure 1, the battery tray 2 is shown in a longitudinal section. The outer wall 5 comprises a left outer wall 5a, a right outer wall 5b, and a [unclear text] in the front plane of the drawing. 24325 / P24026-DEa / KBS= EM-KBS004

[0060] February 13, 2025 - Geirhos

[0061] 10. A horizontal front wall, which is not shown in detail in Figure 1, and a rear wall lying at the back in the plane of the drawing, which is not shown in detail in Figure 1.

[0062] In the illustrated embodiment, the battery tray 2 is provided with an intermediate floor 9, which is connected to the outer walls 5a, 5b, the front wall and the rear wall. The intermediate floor 9 divides the outer shell 6 and thus the interior of the battery tray 2 into a filling chamber 7, which has a defined filling volume and is filled with the ballast material 3a as ballast filling 3, and into a receiving chamber 8, in which battery modules, in particular lithium-ion battery modules, can be installed after the filling chamber 7 has been filled with the ballast material 3a.

[0063] The battery tray 2 is preferably formed from sheets, in particular steel sheets.

[0064] The filling device 1 comprises a weighing device 15, which is designed, for example, as a scale 15a. The weighing device 16 is designed to record the weight of the battery tray 2 together with the ballast filling 3 during the filling process.

[0065] The filling device 1 comprises at least two storage containers for two variants of ballast materials of different densities. In the illustrated device, a first storage container 20a is provided for a first variant of the ballast material 3a1, a second storage container 20b for a second variant of the ballast material 3a2, a third storage container 20c for a third variant of the ballast material 3a3, and a fourth storage container 20d for a fourth variant of the ballast material 3a4.

[0066] The ballast materials 3a1 to 3a4 are preferably each formed as comminuted metal parts and / or comminuted slag, which differ in terms of particle size and thus in terms of density, wherein ballast material 3a1 has a first density D1, ballast material 3a2 a second density D2, ballast material 3a3 a third density D3, and ballast material 3a4 a fourth density D4. The densities D1, D2, D3, and D4 are each different from one another.

[0067] The filling device 1 further comprises an electronic control unit 25, which performs a density control DR as described later. 24325 / P24026-DEa / KBS= EM-KBS004

[0068] February 13, 2025 - Geirhos

[0069] 11

[0070] The storage containers 20a, 20b, 20c, 20d each have a discharge opening equipped with a discharge gate 21a, 21b, 21c, 21d, for example, a flap or a rotary valve. The discharge openings on the storage containers 20a, 20b, 20c, 20dc with the corresponding discharge gate 21a, 21b, 21c, 21d are designed to discharge ballast material 3a1, 3a2, 3a3, 3a4 from the associated storage container 20a, 20b, 20c, 20d for filling the filling chamber 7 of the battery trough 2.

[0071] The electronic control unit 25 is in operative connection with the weighing device 15 on the input side - as illustrated by the arrow P1 in Figure 1.

[0072] The electronic control unit 25 is connected on the output side - as illustrated by the arrow P2 in Figure 1 - to the discharge gates 21a, 21b, 21c, 21d for their control.

[0073] The electronic control unit 25 is provided with an input interface 26, which is configured to obtain a target volume Vsoii of the filling chamber 7 and a target mass Msoii of the battery trough 2 filled with ballast 3 for a battery trough BGx to be filled with ballast 3 during the filling process. The battery trough 2 (BGx) currently to be filled with ballast 3 by the filling device 1 thus defines the volume available for filling with ballast 3 (target volume Vsoii) and the required mass (target mass Msoii).

[0074] The electronic control device 25 is further equipped with an input interface 27 which is configured to obtain the size, for example part size or grain size, and / or the density D1 , D2, D3, D4 for each variant of the ballast material 3a1, 3a2, 3a3, 3a4 located in the corresponding storage container 20a, 20b, 20c, 20d.

[0075] With the filling device 1 according to the invention, the filling chamber 7 of the battery trough 2 is filled with ballast material 3a, which consists of and is composed of ballast materials 3a1, 3a2, 3a3, 3a4 with different sizes and densities D1, D2, D3, D4. 24325 / P24026-DEa / KBS= EM-KBS004

[0076] February 13, 2025 - Geirhos

[0077] 12

[0078] During the filling process, the weight of the battery tray 2 together with the ballast already filled in 3 is continuously measured by the filling device 1 according to the invention using the weighing device 15.

[0079] From the continuous measurement, together with the available filling volume (target volume Vsoii of the filling chamber 7), the composition of the individual ballast materials 3a1 , 3a2, 3a3, 3a4 is selected by the filling device 1 according to the invention via the density control DR, each of which is preferably formed from crushed metal parts and / or crushed slag.

[0080] With the filling device 1 according to the invention, depending on the availability of the metal parts, the available filling volume (target volume Vsoii of the filling chamber 7) can be filled as cost-effectively as possible for a given mass to be filled, whereby the cost of the ballast filling 3 depends directly on the individual variants of the metal parts and their different sizes and densities.

[0081] Figure 2 shows the structure of the control loop of the density control DR, which is carried out by the electronic control unit 25 during the filling process of a battery trough 2 with the ballast filling 3.

[0082] In density control DR, the target volume Vsoii of filling chamber 7 and the target mass Msoii of battery trough 2 filled with ballast 3 are determined based on the battery trough 2 (BGx) currently being filled. The battery trough 2 (BGx) currently being filled specifies and defines the target volume of filling chamber 7 available for filling and the required target mass Msoii. A target density Dsoii is then determined from the target volume Vsoii of filling chamber 7 and the target mass Msoii.

[0083] During the filling process of the battery trough 2 to be filled, the actual mass Mj is continuously, i.e. constantly, measured by means of the weighing device 15. SThe mass of battery tray 2, including ballast filling 3, is determined from the measured actual mass Mj. S t results in an actual density Di s t, which is determined. 24325 / P24026-DEa / KBS= EM-KBS004 13.02.2025 - Geirhos

[0084] 13

[0085] Depending on the target density Dsoii and the actual density Di s t results in a density that is the input variable EG of a controller with a control section 30 for the density and thus the composition of the ballast material 3a to be filled.

[0086] Depending on the input variable EG and the available different variants of ballast materials 3a1 to 3a4 with their different densities D1 to D4, the controller 30 regulates a specific composition of the ballast filling 3 to be applied, and thus a specific mixture of ballast material 3a from the various ballast materials 3a1 to 3a4. This mixture ensures that, at the end of the filling process, when the filling chamber 7 is completely filled with ballast filling 3, the filled battery trough 2 has the required target mass Msoii. For this purpose, the controller 30 generates corresponding control signals as output variables AG for the discharge gates 21a, 21b, 21c, and 21d.

[0087] The invention is not limited to the illustrated embodiment.

[0088] The ballast material 3a filled into the filling chamber 7 can be provided with a composite material, for example a resin, in particular a synthetic resin.

[0089] For this purpose, the ballast material 3a falling into the filling chamber 7 can be sprayed with the composite material using a suitable spraying device.

[0090] The ballast material 3a, coated with the composite material, hardens into a composite material in the filling chamber 7 of the battery trough 2. After hardening, the composite material exists as a solid body within the battery trough 2. The hardened composite material represents additional weight and results in high stiffness, high impact resistance, and high mechanical stability of the battery trough 2, whereby the outer wall 6 of the battery trough 2 can be made of thin-walled steel sheets.

Claims

24325 / P24026-DEa / KBS= EM-KBS004 02 / 13 / 2025 - Geirhos 14 Patent claims 1. Method for filling a battery trough (2) of a traction battery, in particular a lithium-ion traction battery, for a mobile working machine, in particular a forklift truck, with a ballast filling (3), wherein a filling chamber (7) of the battery trough (2) is filled with the ballast filling (3) in a filling process, characterized in that during the filling process a density control (DR), in particular a continuous density control, of the battery trough (2) filled with the ballast filling (3) is carried out.

2. Method according to claim 1, characterized in that, based on the battery trough (2; BGx) to be filled, a target volume (Vsoii) of the filling space (7) and a target mass (Msoii) of the battery trough (2) filled with the ballast filling (3) is determined, and a target density (Dsoii) is determined from the target volume (Vsoii) and the target mass (Msoii).

3. Method according to claim 1 or 2, characterized in that during the filling process of the battery trough (2) to be filled, the actual mass (waste) of the battery trough (2) filled with the ballast filling (3) is determined, in particular continuously, and an actual density (Di s t) is determined.

4. Method according to claim 3, characterized in that an input variable (EG) of a controller (30) is determined from the target density (Dsoii) and the actual density (Dist).

5. Method according to claim 4, characterized in that the composition of the ballast filling (3) from at least two variants of ballast materials (3a1 ; 3a2; 3a3; 3a4) having different densities (D1 , D2, D3, D4) is adjusted by the controller (30) during the filling process depending on the input quantity (EG). 24325 / P24026-DEa / KBS= EM-KBS004 February 13, 2025 - Geirhos 15 6. Method according to one of claims 1 to 5, characterized in that metal parts and / or slag with at least two different densities are used as ballast filling (3).

7. Filling device (1) configured to fill a filling chamber (7) of a battery trough (2) of a traction battery, in particular a lithium-ion traction battery, for a mobile working machine, in particular a forklift truck, with a ballast filling (3) in a filling process, wherein the filling device (1) comprises a weighing device (15) configured to detect, in particular continuously detect, the weight of the battery trough (2) together with the ballast filling (3) during the filling process, and comprises at least two storage containers (20a; 20b; 20c; 20d) for two variants of ballast materials (3a1; 3a2; 3a3; 3a4) of different densities (D1; D2; D3; D4), wherein the filling device (1) has an electronic control device (25) performing a density control (DR) according to any one of claims 1 to 6.

8. Filling device (1) according to claim 7, characterized in that the electronic control device (25) is provided with an input interface (26) which is configured to obtain a target volume (Vsoii) of the filling chamber (7) and a target mass (Msoii) of the battery trough (2) filled with the ballast filling (3) for a battery trough (2) to be filled with the ballast filling (3) in the filling process.

9. Filling device (1) according to claim 7 or 8, characterized in that the electronic control device (25) is provided with an input interface (27) which is configured to obtain the size and / or density (D1 ; D2; D3; D4) of the respective ballast material (3a1 ; 3a2; 3a3; 3a4) for each variant of the ballast materials (3a1 ; 3a2; 3a3; 3a4).

10. Filling device (1) according to one of claims 7 to 9, characterized in that each storage container (20a; 20b; 20c; 20d) is provided with a discharge opening (21a; 21b; 21c; 21d) that can be controlled by the electronic control unit (25), wherein the discharge opening (21a; 21b; 21c; 21d) is designed to discharge ballast material (3a1; 3a2; 3a3; 3a4) from the storage container (20a; 20b; 20c; 20d) for filling the battery trough (2). 24325 / P24026-DEa / KBS= EM-KBS004 February 13, 2025 - Geirhos 16 11. Lithium-ion traction battery for a mobile working machine, in particular a forklift truck, using a battery tray (2) manufactured according to claims 1 to 6, wherein at least one lithium-ion battery module (10) is installed in the battery tray (2) provided with the ballast filling (3).

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