Traction battery for a battery-electric vehicle

Abstract

The invention relates to a traction battery (1) for a battery-electric vehicle, comprising at least one battery module (2): - several rechargeable electrochemical battery cells (3), - a battery housing (4) having an interior housing space (5) for receiving the battery cells (3) and a flat housing base (6) on which the battery cells (3) are directly or indirectly supported, - has at least one temperature sensor (18) arranged on the battery housing (4) for measuring the temperature of the battery cells (3). Improved temperature measurement is achieved by arranging the respective temperature sensor (18) inside the housing (5) on an inner side (19) of the housing, such that one of the battery cells (3) is supported on the housing base (6) via the temperature sensor (18).

Description

[0001] The present invention relates to a traction battery for a battery-electric vehicle according to the preamble of claim 1.

[0002] A traction battery of this type is known, for example, from DE 10 2020 135 014 A1 and comprises at least one battery module having a plurality of rechargeable electrochemical battery cells. The battery module has a battery housing with a housing interior for accommodating the battery cells and a flat housing base on which the battery cells are directly or indirectly supported. Furthermore, the battery module has a temperature sensor arranged on the battery housing for measuring the temperature of the battery cells. The battery cells are designed as cylindrical, round cells, so that each has a longitudinal cell center axis and two end faces facing away from each other with respect to the longitudinal cell center axis.The battery cells are arranged in the housing interior such that their longitudinal center axes run parallel to one another and perpendicular to the housing base, so that the battery cells are each supported directly or indirectly on the housing base via one of their end faces. In the known traction battery, the temperature sensor is arranged on the outside of the housing, preferably in a sensor recess which is formed for this purpose on the outside of the battery housing, in particular on the outside of a housing cover opposite the housing base. In the known traction battery, the temperature of the outside of the housing is therefore measured in order to determine the temperature of the battery cells. In traction batteries with temperature control of the battery cells, which causes the battery cells to be cooled or heated as needed, the temperature measurable on the outside of the battery housing deviates significantly from the actual temperature of the battery cells.

[0003] Knowing the current temperature of the battery cells as accurately as possible is beneficial for the safe operation of the traction battery. In particular, it allows for early detection of impending overheating of the battery cells, allowing appropriate countermeasures to be initiated in a timely manner.

[0004] The present invention addresses the problem of providing an improved embodiment for a traction battery of the type described above, which is characterized in particular by an improved measurement of the temperature of the battery cells.

[0005] This problem is solved according to the invention by the subject matter of the independent claim. Advantageous embodiments are the subject matter of the dependent claims.

[0006] The invention is based on the general idea of ​​arranging at least one temperature sensor in the housing interior on one of the inside walls of the housing. In this way, the temperature is measured directly within the housing interior, such that the measured temperature corresponds relatively accurately to the actual temperature of the battery cells. Furthermore, the invention proposes arranging the respective temperature sensor in the housing interior such that one of the battery cells, with its end face facing the housing base, rests against the housing base via the temperature sensor. This results in several advantages. On the one hand, the temperature of the battery cells is measured directly at one of the battery cells, representative of all other battery cells, such that the current actual temperature of the battery cells is determined almost immediately using the temperature sensor.This is especially true if the traction battery is equipped with a temperature control system for heating or cooling the battery cells as needed. Furthermore, the temperature sensor integrated into the battery cell support on the housing base can be easily arranged, fixed, or positioned in a fixed location within the battery housing. In the case of an immersion-temperature-controlled traction battery, in which a dielectric and, in particular, liquid temperature control medium flows through the battery housing so that the battery cells come into direct contact with the temperature control medium, the temperature sensor arranged between the front side of the respective battery cell and the housing base does not constitute an obstacle to the temperature control medium flowing around the respective battery cell. This improves the efficiency of the temperature control even in the area of ​​the battery cell whose temperature is measured using the temperature sensor.

[0007] Preferably, the traction battery can be configured as an immersion-temperature-controlled traction battery, such that a temperature control path is routed through the battery housing such that a temperature control medium guided by the temperature control path comes into direct contact with the battery cells. Depending on the operating state of the traction battery, cooling or heating of the battery cells may be necessary to optimize the performance of the traction battery. A temperature-controlled, in particular immersion-temperature-controlled, traction battery is configured for temperature control of the battery cells, so that the battery cells can be cooled or heated as needed.

[0008] In the present context, a ‘configuration’ is synonymous with a ‘design’, so that the phrase ‘configured so that’ is synonymous with the phrase ‘designed so that’.

[0009] The flat caseback defines a plane in which the caseback essentially extends. The phrase "perpendicular to the caseback" refers to the plane of the caseback in which the flat caseback extends.

[0010] According to an advantageous embodiment, the temperature sensor can be clamped between the housing base and the respective battery cell perpendicular to the housing base. This clamping ensures that the temperature sensor is sufficiently securely positioned and held in place on the housing base and the respective battery cell.

[0011] The temperature sensor can expediently comprise a sensor body, via which the respective battery cell is supported on the housing base, and at least one sensor element for temperature measurement. This allows the temperature sensor to fulfill its various functions through appropriate components, which can be optimized for this purpose. The support function is fulfilled by the sensor body, while the temperature measurement function is fulfilled by the respective sensor element. This makes it possible to manufacture the temperature sensor cost-effectively.

[0012] The sensor body can expediently comprise a cell support body that rests against the respective battery cell and a base support body that rests against the housing base. By using two separate bodies for support on the housing base on the one hand and on the front side of the respective battery cell on the other, different materials and / or different material properties can be implemented on the two bodies in order to optimize the support and / or the temperature measurement. The respective sensor element can expediently be arranged on or in the base support body, thereby placing it close to the battery cell to be measured, yet decoupled from the support on the respective battery cell.

[0013] A preferred embodiment is one in which the sensor body additionally comprises a carrier body having an upper side facing the respective battery cell and a lower side facing the housing base. The cell support body is fastened to the upper side of the body, while the base support body is fastened to the lower side of the body. The respective fastening can be, for example, an adhesive connection. If a plastic is used for the cell support body and / or for the base support body, the respective body can also be injection-molded or foamed onto the carrier body. The base support body has an element recess for the respective sensor element, in which the respective sensor element is arranged and within which the respective sensor element is fastened to the carrier body. The respective sensor body is thus largely arranged within the base support body.The respective element recess can be designed as a through-hole that completely penetrates the base support body perpendicular to the housing base. Alternatively, the respective element recess can be designed as a blind hole, so that it is closed on the side facing away from the support body. The respective sensor element is then encapsulated by the base support body and the support body. In the case of temperature control, the respective sensor element is then protected from contact with the temperature control medium.

[0014] It can expediently be provided that the carrier body is formed by a section of a flexible printed circuit board. A flexible printed circuit board usually has a dielectric single-layer or multi-layer film and can also be referred to as an FPCB, where FPCB stands for Flexible Printed Circuit Board. Electrical conductor tracks are located on or in the film. The flexible printed circuit board can, for example, be designed as a flexible printed circuit or FPC, where FPC stands for Flexible Printed Circuit, or as a flat film cable or FFC, where FFC stands for Flexible Flat Cable. The film with the conductor tracks can be elastically bent, which makes the printed circuit board thus formed flexible. Flexible printed circuit boards of this type can be produced particularly inexpensively and can be configured with a very thin wall and thus be extremely flat.This means that the temperature sensor requires very little installation space perpendicular to the housing base.

[0015] Also preferred is an embodiment in which the base support body is designed as an elastic foam body, while the cell support body is designed as a rigid or stiff or dimensionally stable solid body. The base support body and the cell support body are thus designed such that, during normal or proper pressing of the respective battery cell via the temperature sensor on the housing base, oriented parallel to the cell's longitudinal center axis, the elastic base support body is elastically deformed or compressed by at least 10%, while the dimensionally stable cell support body is not deformed or compressed or is deformed by less than 1%. This makes it easier to clamp the temperature sensor between the housing base and the respective battery cell. At the same time, manufacturing tolerances can also be compensated for.A further important advantage of this configuration is that by designing the cell support body as a rigid or stiff solid body, the respective sensor element, which is attached to the side of the support body facing away from the battery cell, always has the same relative position with respect to the battery cell to be measured, regardless of the compression of the base support body designed as an elastic foam body, so that the desired temperature can be measured largely independently of manufacturing tolerances of the battery cells and the battery housing.

[0016] The base support body or the cell support body can be suitably configured dielectrically or made of a dielectric material.

[0017] Likewise, both the base support body and the cell support body can be dielectrically configured or made of corresponding dielectric materials. Additionally or alternatively, the cell support body can be designed as an FR4 body, so that it is formed by a dielectric, rigid, or dimensionally stable solid body. Additionally or alternatively, the base support body can be made of polyurethane foam and accordingly be formed from a dielectric, elastic foam body.

[0018] According to another advantageous embodiment, the respective sensor element can be configured as a surface-mounted element. In particular, the respective sensor element can then be attached to the carrier body particularly easily and in a space-saving manner. Such surface-mounted elements are also referred to as SMDs, where SMD stands for Surface Mounted Device. Additionally or alternatively, the respective sensor element can be configured as a thermistor element. Such thermistor elements are also referred to as NTC elements, where NTC stands for Negative Temperature Coefficient. In a thermistor, the electrical resistance decreases with increasing temperature.

[0019] According to an advantageous embodiment, the respective temperature sensor can have a signal line that extends out of the battery housing. Signals from the temperature sensor or the respective sensor element that correlate with the measured temperature can be transmitted via the signal line to a corresponding evaluation unit, in particular to a battery monitoring circuit. Such wired signal transmission is extremely reliable.

[0020] Advantageously, the housing base can have a through-hole through which the signal line is routed out of the battery housing. This allows the signal line to be routed out of the battery housing relatively close to the battery cell, whose temperature is measured using the temperature sensor. Accordingly, the signal line requires very little space within the housing interior.

[0021] The signal line can be conveniently designed as a flat conductor. Such a flat conductor requires extremely little installation space, allowing more volume within the housing interior for the temperature control medium, for example, if temperature control is provided. Optionally, the through-opening can also be designed as a slot. This adapts the through-opening to the contour of the signal line designed as a flat conductor, which, for example, simplifies secure sealing of the housing interior from the surroundings of the battery housing in the area of ​​the through-opening.

[0022] The signal line connects the respective temperature sensor to a battery monitoring circuit (CSC), where CSC stands for Cell Supervision Circuit. The signal line can have an electrical interface to the CSC at an end remote from the respective temperature sensor. This interface can be implemented using conventional connection technologies between the conductors, such as FPC, FFC, cables, the signal line, and a CSC board (PCB), where PCB stands for Printed Circuit Board. For example, connectors, direct soldering, or laser welding can be used here.

[0023] The respective signal line can be routed directly into the dry outdoor area, where the CSC is located, which processes the signals from the respective temperature sensor. In the case of an immersion-temperature-controlled traction battery, the respective signal line can also run inside the battery module. If the traction battery is configured as an immersion-temperature-controlled traction battery, a temperature control channel can run along the outside of the housing at the bottom of the housing, through which the temperature control medium flows during operation of the traction battery. The passage opening can then be expediently positioned so that it is open to the temperature control channel, thus fluidically connecting the housing interior with the temperature control channel. The opening cross-section of the passage opening can be adapted to the outer cross-section of the signal line so that leakage through the passage opening can be easily reduced or controlled.The hissing between the through-hole and the signal line leaves a gap that can be so small that it creates a throttling effect, acting as a gap seal without the need for a separate sealing element. Any remaining leakage is then so small that it can be tolerated. Alternatively, a separate sealing element can be used to seal the signal line in the through-hole against the battery housing.

[0024] The signal line can be configured elongated and have a first longitudinal section running along the inside of the housing and a second longitudinal section running along the outside of the housing. While the first longitudinal section leads to the respective sensor element, the second longitudinal section can lead to the respective evaluation unit, which was mentioned above.

[0025] In another advantageous embodiment, the signal line can be configured as a flexible printed circuit board, in particular as an FPCB, FPC, or FFC. Such a flexible printed circuit board has a very thin wall and therefore requires little installation space.

[0026] A particularly advantageous configuration is one in which the carrier body of the temperature sensor is formed by a section of the flexible circuit board that forms the signal line. This results in an extremely simple structure for the temperature sensor with signal line.

[0027] According to an advantageous embodiment, the housing base can have at least one projection on the inside of the housing that protrudes into the housing interior, against which the respective temperature sensor rests perpendicularly to the housing base. This projection improves the contact between the temperature sensor and the housing base on the one hand and the respective battery cell on the other.

[0028] The sensor body can have a round and preferably circular cross-section perpendicular to the housing base. Accordingly, the projection of the housing base can also have a round, particularly circular, cross-section perpendicular to the housing base.

[0029] The base support body can optionally be attached to the battery cell with an adhesive. Suitable adhesive systems are very thin, especially less than 50µm, and can be based on acrylics, for example, with or without a carrier film. The impact on the measurement is negligible. The use of an adhesive system can significantly improve the robustness of the measuring point, for example, in the case of mechanical stress caused by vibration and shock.

[0030] The battery housing expediently also has a housing wall that runs in a closed manner around the battery cells and which can in particular be formed at least partially integrally with the housing base. In addition, the battery housing can have a housing cover, which in particular is also configured flat and is arranged on a side of the battery housing facing away from the housing base. The housing wall can also in particular be formed at least partially integrally with the housing cover. Furthermore, the respective battery module can have at least one cell holder that is arranged in the housing interior and that positions a plurality of battery cells relative to one another and relative to the battery housing. This makes it possible to achieve reliable airflow around all battery cells, particularly in the case of immersion temperature control.

[0031] Further important features and advantages of the invention emerge from the subclaims, from the drawings and from the associated description of the figures based on the drawings.

[0032] It is understood that the features mentioned above and those to be explained below can be used not only in the respective combination specified, but also in other combinations or on their own, without departing from the scope of the invention defined by the claims. Components mentioned above and to be mentioned below of a higher-level unit, such as a device, apparatus, or arrangement, which are designated separately, may form separate parts or components of this unit or be integral areas or sections of this unit, even if this is shown differently in the drawings.

[0033] Preferred embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description, wherein the same reference numerals refer to the same or similar or functionally identical components.

[0034] They show, schematically, Fig. 1 an isometric view of a traction battery with several stacked assembled battery modules and a disassembled battery module in an isometric exploded view, Fig. 2 an isometric view of a partially shown battery module, Fig. 3 an exploded view of part of the battery module, Fig. 4 an isometric sectional view of the battery module in the area of ​​a temperature sensor, Fig. 5 an isometric view of the inside of a housing in the area of ​​the temperature sensor, Fig. 6 an isometric view of a housing exterior area of ​​the temperature sensor, Fig. 7 a sectional view of the battery module in the area of ​​the temperature sensor, Fig. 8A is an isometric top view of the temperature sensor, Fig. 8B is an isometric view from below of the temperature sensor, Fig. 9A is an enlarged top isometric view of the temperature sensor in the region of a sensor body, Fig. 9B is an enlarged bottom isometric view of the temperature sensor in the sensor body area.

[0035] Accordingly Fig. 1 comprises a traction battery 1 configured for a battery-electric vehicle, at least one battery module 2 having a plurality of rechargeable electrochemical battery cells 3. In Fig. 1 shows a traction battery 1 with four such battery modules 2, wherein the three battery modules 2 shown on the right are shown in the assembled state and are built onto or stacked on top of one another, while the fourth battery module 2 shown on the left is shown exploded so that the individual components can be seen. Each battery module 2 has a battery housing 4 which has an interior 5 for accommodating the battery cells 3 and a flat housing base 6. The battery cells 3 are supported directly or indirectly on the housing base 6. Each battery housing 4 also has a housing cover 7 which is expediently also designed to be flat and lies perpendicular to the housing base 6 opposite the housing base 6. In addition, the battery housing 4 has a housing wall 8 which, in the example shown here, is integrally formed partly on the housing base 6 and partly on the housing cover 7.The housing wall 8 extends around the housing interior 5 and thus around the battery cells 3 accommodated therein. A fluid distribution plate 9 and an intermediate plate 10 can be arranged between adjacent battery modules 4. The battery modules 4 are stacked one upon the other with respect to a stacking direction 11. With respect to the stacking direction 11, a front end plate 12 and a rear end plate 13 are located at the longitudinal ends of the traction battery 1. The traction battery 1 is expediently configured as an immersion-temperature-controlled traction battery 1, so that a corresponding dielectric temperature control medium, in particular a dielectric liquid, can be supplied and removed via corresponding connections, which can be seen, for example, on the rear end plate 13.The fluid distribution plates 9 support a targeted flow through the housing interiors 5 of the battery modules 4 of the traction battery 1, whereby the battery cells 3 come into direct contact with the temperature control medium.

[0036] In Fig. 1 shows further peripheral components of the traction battery 1, which are not identified in more detail, but which can serve, for example, for electrical contact, fluid distribution, and for attaching the battery modules 2 to one another. The individual battery modules 2 or their battery housings 4 can expediently be configured in a cuboid shape.

[0037] The battery cells 3 are configured here as cylindrical, in particular circular-cylindrical, round cells, each having a longitudinal cell center axis 14 and two end faces 15 and 16 facing away from one another with respect to the longitudinal cell center axis 14. Furthermore, the battery cells 3 are arranged in the housing interior 5 such that their longitudinal cell center axes 14 run parallel to one another and perpendicular to the flat housing base 6. The battery cells 3 are each supported directly or indirectly on the housing base 6 via one of the end faces 15, 16, here via the one or first end face 15. The electrical contact between the battery cells 3 is then usually made on the other or second end face 16, although this is not shown in more detail.To improve a predetermined positioning of the battery cells 3 within the housing interior 5, a plurality of cell holders 17 can be used, each of which interacts with a plurality of battery cells 3 in order to position and hold them in the battery housing 4. For example, . Fig. 2 that several such cell holders 17 are provided for this purpose, each of which is arranged between two areas of adjacent battery cells 3 in order to position them relative to each other. Fig. 4, Fig. 6 and Fig. 7 also shows that the battery cells 3 are supported on the housing base 6 via sections of the cell holders 17.

[0038] It is noteworthy that the stacking direction 11, in which the battery modules 2 are attached to one another, runs parallel to the longitudinal center axes 14 of the battery cells 3. In the installed state, the traction battery 1 is mounted on the vehicle such that the stacking direction 11 extends essentially horizontally, resulting in a horizontal arrangement for the battery cells 3 in the operational traction battery 1 or in the vehicle.

[0039] At least one of the battery modules 2 is equipped with at least one temperature sensor 18, which is configured to measure a temperature of the battery cells 3. Each battery module 2 expediently has at least one such temperature sensor 18. The temperature sensor 18 is in the Fig. 4 to 9 shown.

[0040] According to the Fig. 4 to 9, the temperature sensor 18 is arranged in the housing interior 5 on a housing inner side 19, in such a way that one of the battery cells 3, with its end face 15 facing the housing bottom 6, is supported on the housing bottom 6 via this temperature sensor 18. Preferably, the temperature sensor 18 can be clamped between the housing bottom 6 and the respective battery cell 3 perpendicular to the housing bottom 6.

[0041] According to the Fig. 4, Fig. 8 and Fig. 9, the temperature sensor 18 has a sensor body 20 and at least one sensor element 21. In the embodiment shown here, the temperature sensor 18 has two sensor elements 21 that are redundantly connected or enable redundant temperature measurement. The respective battery cell 3 is supported on the housing base 6 via the sensor body 20. The sensor body 20 has a cell support body 22 that rests against the respective battery cell 3 and a base support body 23 that rests against the housing base 6. The respective sensor element 21 is arranged on or in the base support body 23. Furthermore, the sensor body 20 can have a carrier body 24 that has an upper body side 25 facing the respective battery cell 3 and is fastened to the cell support body 23, and a lower body side 26 facing the housing base 6 and is fastened to the base support body 23.The respective sensor element 21 is preferably attached to the base body 24 on the underside 26 of the body. For this purpose, an element recess 27 can be formed in the base support body 23 for each sensor element 21, in which the respective sensor element 21 is arranged. The respective element recess 27 is configured here as a through-opening that completely penetrates the base support body 23.

[0042] The carrier body 24 can be formed by a section 28 of a flexible printed circuit board 29. The base support body 23 can be designed as an elastic foam body and consist, for example, of polyurethane foam. The cell support body 22, in contrast, can be designed as a rigid or stiff or dimensionally stable solid body and can be designed, for example, as an FR4 body. Both the base support body 23 and the cell support body 22 are expediently dielectrically configured or consist of dielectric materials. The respective sensor element 21 is preferably a surface-mounted element that is attached, preferably soldered, directly to the body underside 26 of the carrier body 24. The respective sensor element 21 is preferably configured as a thermistor element. The base support body 23 can be glued or foamed onto the carrier body 24.The cell support body 22 can be glued or injection-molded to the carrier body 24.

[0043] According to the Fig. 5 to 9, the temperature sensor 18 has a signal line 13 that extends out of the battery housing 4. For this purpose, the housing base 6 can be equipped with a through-opening 31 through which the signal line 30 extends out of the battery housing 4. In the example shown here, the signal line 30 is designed as a flat conductor 32, which is characterized by a flat cross-section. Complementarily, the through-opening 31 is configured here as a slot 33. Accordingly, the signal line 30 has a first longitudinal section 34 running along the housing interior 19 and a second longitudinal section 35 running along a housing exterior 36. In Fig. 6, the housing outer side 36 of the housing base 6 is facing the viewer, wherein the housing base 6 is shown transparent to allow a view into the housing interior 5. The first longitudinal section 34 covered by the housing base 6 is in Fig. 6 is shown with a broken line, while the second longitudinal section 35 visible on the outer side 36 of the housing is shown with a solid line. In contrast, in Fig. 5 the housing inner side 19 in the area of ​​the housing base 6 faces the viewer, so that the first longitudinal section 34 running there is shown with a solid line, while the second longitudinal section 35, which is concealed by the housing base 6 and runs on the housing outer side 36, is shown with a broken line.

[0044] A preferred configuration is one in which the signal line 30 is configured as a flexible printed circuit board 29. This allows the signal line 30 to be configured particularly easily as a flat conductor 32. Particularly expediently, the signal line 30 configured as a flexible printed circuit board 29 extends into the sensor body 20. A configuration in which the carrier body 24 of the sensor body 20 is formed by a section 28 of the flexible printed circuit board 29, which forms the signal line 30, is particularly advantageous. The signal line 30 is also in the Fig. 8A and Fig. 8B is not fully shown. In particular, the signal line 30 may have an interface to a battery monitoring circuit or CSC at its end (not shown) remote from the respective temperature sensor 18.

[0045] If the traction battery 1 is configured as an immersion-temperature traction battery 1, Fig. 7, a temperature control channel 40 runs along the housing outer side 36 at the housing base 6, through which the temperature control medium flows during operation of the traction battery 1. The passage opening 31 can now expediently be positioned such that it is open toward the temperature control channel 40 and thereby fluidically connects the housing interior 5 with the temperature control channel 40. The signal line 30, which penetrates the passage opening 31, blocks the free cross-section of the passage opening 31 to such an extent that no or only a small, tolerable leakage occurs. The first longitudinal section 34 of the signal line 30 therefore runs in the housing interior 5, while the second longitudinal section 35 runs in the temperature control channel 40.

[0046] According to the Fig. 4 to 7, the housing base 6 can have on the housing inner side 19 for the respective temperature sensor 18 a projection 37 projecting into the housing interior 5, which is positioned such that the temperature sensor 18 is supported on this projection 37 perpendicular to the housing base 6.

[0047] In the examples of Fig. 5 to 7, the projection 37 on the inside of the housing 19 has a flat and continuous surface on which the sensor body 20 is supported. In contrast, Fig. 4 shows a special embodiment in which the surface of the projection 37 facing the housing interior 5 is shaped complementarily to the base support body 23. In particular, the projection 37 can have a circumferential collar 38 whose free inner cross-section essentially corresponds to the outer cross-section of the base support body 23, so that the base support body 23 can be inserted axially into the collar 38 with respect to the longitudinal center axis 14 of the respective battery cell 3. Additionally or alternatively, the projection 37 can have a complementary elevation 39 for the respective element recess 27, which penetrates axially into the associated element recess 27 with respect to the longitudinal center axis 14 of the respective battery cell 3. In Fig. 4 shows a state during assembly in which the respective elevation 39 has not yet penetrated axially into the associated element recess 27 and the floor support body 23 has not yet penetrated axially into the collar 38.

[0048] How the Fig. 5 and Fig. As can be seen from Figure 6, the temperature sensor 18 can preferably be assigned to a battery cell 3 located in a corner area of ​​the overall cuboid-shaped battery housing 4. This simplifies the routing of the signal line 30. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2020 135 014 A1

[0002]

Claims

[1] Traction battery (1) for a battery-electric vehicle, - with at least one battery module (2) having a plurality of rechargeable electrochemical battery cells (3), - wherein the battery module (2) has a battery housing (4) which has a housing interior (5) for receiving the battery cells (3) and a flat housing base (6) on which the battery cells (3) are directly or indirectly supported, - wherein the battery module (2) has at least one temperature sensor (18) arranged on the battery housing (4) for measuring a temperature of the battery cells (3), - wherein the battery cells (3) are designed as cylindrical round cells, each having a cell longitudinal center axis (14) and two end faces (15, 16) facing away from each other with respect to the cell longitudinal center axis (14), - wherein the battery cells (3) are arranged in the housing interior (5) in such a way that their longitudinal cell center axes (14) run parallel to one another and perpendicular to the housing base (6), so that the battery cells (3) are each supported directly or indirectly on the housing base (6) via one of the end faces (15, 16), characterized by , - that the respective temperature sensor (18) is arranged in the housing interior (5) on a housing inner side (19) in such a way that one of the battery cells (3) is supported on the housing bottom (6) via the temperature sensor (18) with its end face (15) facing the housing bottom (6). [2] Traction battery (1) according to claim 1, characterized by , - that the temperature sensor (18) is clamped between the housing base (6) and the respective battery cell (3) perpendicular to the housing base (6). [3] Traction battery (1) according to claim 1 or 2, characterized by , - that the temperature sensor (18) has a sensor body (20), via which the respective battery cell (3) is supported on the housing base (6), and at least one sensor element (21) for temperature measurement. [4] Traction battery (1) according to claim 3, characterized by , - that the sensor body (20) has a cell support body (22) lying against the respective battery cell (3) and a base support body (23) lying against the housing base (6), - that the respective sensor element (21) is arranged on or in the floor support body (23). [5] Traction battery (1) according to claim 4, characterized by , - that the sensor body (20) has a support body (24) which has a top side (25) fastened to the cell support body (22) and a bottom side (26) fastened to the base support body (23), - that the respective sensor element (20) is arranged in an element recess (27) formed on the base support body (23) and is fastened to the carrier body (24) on the underside (26). [6] Traction battery (1) according to claim 5, characterized by , - that the carrier body (24) is formed by a section (28) of a flexible printed circuit board (29). [7] Traction battery (1) according to one of claims 4 to 6, characterized by , - that the floor support body (23) is designed as an elastic foam body, - that the cell support body (22) is designed as a rigid solid body. [8] Traction battery (1) according to one of claims 4 to 7, characterized by , - that the base support body (23) and / or the cell support body (22) is dielectrically configured or consists of a dielectric material, and / or - that the cell support body (22) is designed as an FR4 body, and / or - that the cell support body (22) is bonded to the battery cell (3) via an adhesive system made of acrylate, and / or - that the floor support body (23) is made of polyurethane foam. [9] Traction battery (1) according to one of claims 3 to 8, characterized by , - that the respective sensor element (21) is configured as a surface-mounted element, and / or - that the respective sensor element (21) is configured as a thermistor element. [10] Traction battery (1) according to one of the preceding claims, characterized by , - that the respective temperature sensor (18) has a signal line (30) which is led out of the battery housing (4). [11] Traction battery (1) according to claim 10, characterized by , - that the housing base (6) has a passage opening (31) through which the signal line (30) is led out of the battery housing (4). [12] Traction battery (1) according to claim 10 or 11, characterized by , - that the signal line (30) is designed as a flat conductor (32), - that the passage opening (31) is designed as a slot (33). [13] Traction battery (1) according to one of claims 10 to 12, characterized by , - that the signal line (30) has a first longitudinal section (34) running along the housing inner side (5) and a second longitudinal section (35) running along a housing outer side (36). [14] Traction battery (1) according to one of claims 10 to 13, characterized by , - that the signal line (30) is configured as a flexible printed circuit board (29). [15] Traction battery (1) according to claims 5 and 14, characterized by , - that the carrier body (24) is formed by a section (28) of the flexible printed circuit board (29) which forms the signal line (30). [16] Traction battery (1) according to one of the preceding claims, characterized by , - that the housing base (6) has at least one projection (37) on the housing inner side (19) projecting into the housing interior (5), on which projection the respective temperature sensor (18) is supported perpendicular to the housing base (6).

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