Traction battery for a motor vehicle

Abstract

The invention relates to a traction battery (1) for a motor vehicle, comprising a cell module (2) with a battery cell arrangement (4) and a temperature control device (6) for temperature control of the battery cell arrangement (4), wherein a cell connector (11) is arranged between each pair of battery cells (8, 9) of the battery cell arrangement (4), which is connected to connection terminals (10) of the battery cells (8, 9) to establish an electrical connection between the battery cells (8, 9). The temperature control device (6) includes a temperature control element (5) with at least one fluid channel and a temperature control surface (12) against which the battery cells (8, 9) make heat-transferring contact, wherein a heat transfer projection (18, 19) extends from the temperature control element (5), which extends between the battery cells (8, 9) and makes heat-transferring contact with the cell connector (11).

Description

[0001] The invention relates to a traction battery for a motor vehicle, comprising a cell module with a battery cell arrangement and a temperature control device for temperature control of the battery cell arrangement, wherein a cell connector is arranged between each pair of battery cells of the battery cell arrangement, which is connected to connection terminals of the battery cells to establish an electrical connection between the battery cells.

[0002] For example, German patent application DE 10 2016 116 581 A1 is known from the prior art. This document describes a connecting plate for connecting battery cells for a battery, wherein the connecting plate has contact points on a front and a back side, and wherein each contact point is designed to form an electrically and thermally conductive connection with a battery cell, so that several battery cells can be thermally and electrically connected to one another via the connecting plate. The connecting plate includes at least one heat dissipation element for dissipating heat from the connecting plate. The heat dissipation element is designed as a cooling channel through which a coolant can flow. Alternatively, the heat dissipation element is designed as a thermally conductive core layer. The core layer can include at least one cooling channel through which the coolant can flow.

[0003] Furthermore, German patent application DE 10 2019 217 766 A1 discloses a high-voltage battery for an electrically powered vehicle, comprising at least one battery module in whose module housing a plurality of cylindrical battery cells are arranged, stacked coaxially in series with their end faces facing each other. It is provided that at least one partition wall is provided in the module housing, arranged between the facing end faces of the cylindrical battery cells, and that the partition wall, as part of a battery cooling system, is coolant-flushed through it.

[0004] German patent application DE 10 2011 001 371 A1 also discloses a motor vehicle with a battery comprising a housing with battery cells and a temperature control / cooling system. To further improve the crash performance of a motor vehicle with a battery, the supply and / or return lines of the temperature control / cooling system are designed as fluid-carrying impact tubes.

[0005] The object of the invention is to propose a traction battery for a motor vehicle which has advantages over known traction batteries, in particular enabling effective temperature control of the battery cell arrangement of the cell module even at high energy storage density of the traction battery.

[0006] This is achieved according to the invention with a traction battery for a motor vehicle with the features of claim 1. It is provided that the temperature control device has a temperature control element with at least one fluid channel and a temperature control surface against which the battery cells make heat-transferring contact, wherein a heat transfer projection extends from the temperature control element, which extends between the battery cells and makes heat-transferring contact with the cell connector.

[0007] Advantageous embodiments with expedient further developments of the invention are specified in the dependent claims. It should be noted that the exemplary embodiments described in the description are not limiting; rather, any variations of the features disclosed in the description, the claims, and the figures are possible.

[0008] The traction battery is preferably an integral part of the motor vehicle; however, it can, of course, also be separate from it, particularly until the traction battery is mounted on or in the motor vehicle. The traction battery is designed and configured for the intermediate storage of electrical energy for the motor vehicle's drive system. The drive system serves to propel the motor vehicle, i.e., to provide drive torque for propelling the motor vehicle. To provide the drive torque, the drive system has at least one drive unit, which is designed as an electric traction motor and is electrically connected to the traction battery.

[0009] The electrical energy temporarily stored in the traction battery is used, at least temporarily, to power the vehicle, i.e., to provide the drive torque for propelling the vehicle by means of the drive unit or drive system. Conversely, it may be provided that electrical energy supplied by the drive unit is temporarily stored in the traction battery.

[0010] The traction battery comprises a battery cell assembly, which in turn contains several battery cells. The battery cells are preferably prismatic or pouch cells. The battery cell assembly, together with the temperature control unit, forms the cell module of the traction battery. The cell module is, for example, a component of a battery module of the traction battery, which, in addition to the cell module, preferably includes end plates and / or a clamping device. The battery module can have one or more cell modules. In particular, the cell modules of the battery module are identically designed, so that the descriptions in this document apply to each of the multiple cell modules of the battery module. The cell module or the multiple cell modules are preferably arranged between the end plates and clamped by means of the clamping device to form the battery module.

[0011] The end plates are, for example, a component of a battery module housing. The end plates accommodate the cell module(s), in particular the battery cell arrangement(s) within the cell modules. In this respect, the end plates are arranged on opposite sides of the cell module(s). Preferably, the battery cell arrangement is cuboid or at least approximately cuboid.

[0012] The multiple battery cells of the battery cell assembly are electrically interconnected. For this purpose, the battery cells are arranged, for example, such that their electrical connections, also known as terminals, are located on the same side and / or facing each other. The terminals of the battery cells are electrically connected to each other by means of a cell connector. More precisely, a cell connector is positioned between each pair of battery cells, electrically connecting the terminals of these two battery cells.

[0013] At the ends of the battery cell assembly, the cell modules preferably have additional connection terminals. These end-end connection terminals are electrically connected to busbars, which are preferably also electrically connected to electrical terminals of the cell module and / or the battery module. For example, the battery module may have several cell modules. In this case, the additional connection terminals of the multiple cell modules are electrically connected to each other via the busbar and are also electrically connected to connection terminals of the battery module. In other words, the battery cells of the cell module are electrically connected to the terminals, in particular those of the cell module and / or the battery module, via the busbars.

[0014] Preferably, the traction battery has a battery housing in which a battery module receptacle is provided and configured to receive one or more battery modules. During the manufacturing of the traction battery, the battery module is inserted into the battery module receptacle. Preferably, not just a single battery module is arranged in the battery housing, but several battery modules are inserted into the battery housing. In such a configuration, the battery housing has a battery module receptacle configured to receive several battery modules, or several battery module receptacles.

[0015] During operation of the traction battery, heat is generated in the battery cell assembly, which must be dissipated, or heat must be supplied to reach a specific temperature of the battery cell assembly. Accordingly, the traction battery or cell module has a temperature control unit by which the battery cell assembly is at least temporarily temperature-controlled. With the help of the temperature control unit, heat is thus at least temporarily dissipated from the battery cell assembly and / or heat is at least temporarily supplied to the battery cell assembly using the temperature control unit.

[0016] The temperature control unit is typically integrated into the battery housing, specifically into the base plate. During assembly of the traction battery, the cell module is inserted into the battery housing in such a way that the battery cell assembly is subsequently connected to the temperature control unit or the base plate via heat transfer. To ensure a reliable connection between the battery cell assembly and the temperature control unit, a thermal interface material can be used. This is sometimes also referred to as a "gap filler." However, this type of traction battery design only allows heat to be dissipated or supplied over a relatively small area of ​​the battery cell assembly. Consequently, achieving a uniform temperature distribution within the battery cell assembly is challenging.

[0017] For this reason, the invention provides that the temperature control device includes a temperature control element. The temperature control element has at least one fluid channel through which a fluid flows, at least temporarily, to regulate the temperature of the battery cell arrangement. In other words, the fluid is supplied to and withdrawn from the fluid channel, at least temporarily, to regulate the temperature of the battery cell arrangement. In particular, the fluid channel is fluidically connected to a fluid circuit.

[0018] The temperature control element is distinct from the base plate of the battery housing; preferably, it is spaced apart from the base plate and / or angled relative to it. When using the temperature control element, it is not necessary to design the base plate to regulate the temperature of the battery cell assembly. The base plate can therefore be designed without a fluid channel. However, it is also possible to incorporate a fluid channel in the base plate, through which the fluid flows at least temporarily.

[0019] Naturally, the temperature control element can contain only a single fluid channel. Preferably, however, the temperature control element contains several fluid channels, which are preferably arranged in parallel for flow analysis purposes. The fluid flows through the multiple fluid channels simultaneously or in parallel. Whenever this description refers to the at least one fluid channel or the fluid channel, the explanations are always equivalent. Explanations concerning the at least one fluid channel are therefore applicable to the fluid channel, and explanations concerning the fluid channel are applicable to the at least one fluid channel. If multiple fluid channels are present, the explanations concerning the at least one fluid channel or the fluid channel are preferably applicable to each of the multiple fluid channels.

[0020] Preferably, the temperature control element is mechanically connected to the battery cell assembly, for example, using a mounting frame. The mounting frame connects the temperature control element and the battery cell assembly; for this purpose, it engages the temperature control element on one side and the battery cell assembly on the other. The battery cell assembly, the temperature control device or the temperature control element, and the mounting frame together form the cell module. This module is inserted into the battery housing, particularly as a component of the battery module. Preferably, during the assembly of the traction battery, the entire cell module is inserted into the battery housing; in this case, the battery cell assembly, the temperature control device or the temperature control element, and the mounting frame connecting them are all inserted into the battery housing together, resulting in a modular design for the traction battery.

[0021] Over time, the battery cell assembly can expand, particularly during charging or discharging of the traction battery. This expansion is also known as "swelling." To counteract this expansion, the battery cell assembly is typically mechanically clamped. For this purpose, the clamping device applies a clamping force to the battery cell assembly, thereby exerting a pressure that counteracts the expansion. This clamping force acts against the expansion force exerted on the clamping device by the expanding battery cell assembly. To clamp the battery cell assembly, the clamping device engages the end plates located on opposite sides of the battery cell assembly and applies the clamping force to them.The end plates are thus forced towards each other by the clamping force, and the battery cell arrangement is subjected to the clamping force via the end plates by the clamping device.

[0022] The clamping device includes, for example, a metal band which, in its open state, is arranged around the battery cell assembly and subsequently closed and tensioned to exert the clamping force. Alternatively, the clamping device may feature a fully enclosed clamping band which, in its closed state, is arranged around the battery cell assembly. In particular, the battery cell assembly is compressed and thus clamped by applying a preload force, the fully enclosed clamping band is arranged around the battery cell assembly, and the preloading of the battery cell assembly is then completed with the preload force.

[0023] The temperature control element has a temperature control surface for maintaining the temperature of the battery cell assembly or the individual battery cells. The temperature control surface is defined as a surface of the temperature control element facing the battery cells, against which the battery cells make contact for heat transfer, preferably over a flat area. The expansion of the battery cell assembly and the resulting dimensional changes can lead to a deterioration of the heat transfer between the battery cell assembly and the temperature control element or the temperature control surface.

[0024] To achieve a particularly reliable thermal connection between the temperature control element and the battery cell assembly, a thermal interface material is preferably introduced between the temperature control element and the battery cell assembly. The temperature control element is thermally coupled to the battery cell assembly via this thermal interface material; for this purpose, the thermal interface material is located between the temperature control element and the battery cell assembly and is in contact with both the temperature control element and the battery cell assembly, particularly over a large area. With the aid of the thermal interface material, the thermal connection between the battery cell assembly and the temperature control element can be maintained and thus ensured even with significant dimensional changes in the battery cell assembly.

[0025] An additional heat source in the traction battery is the cell connector(s). The cell connector(s) exhibit electrical resistance, also known as internal resistance. During operation, particularly during charging or discharging, electric current flows between the battery cells through the cell connector. Due to the internal resistance of the cell connector, this converts electrical energy into heat, causing the connector's temperature to rise. Since the cell connector is connected to the battery cell terminals, the heat is transferred to the battery cells via conduction and / or heat transfer, thus warming them up as well.This causes an inhomogeneity in the temperature distribution within the battery cells, which in turn leads to different aging behaviors within the battery cells. In particular, warmer areas of the battery cells age faster than cooler areas. This applies especially to NMC and NCA battery cells.

[0026] For this reason, it is intended not only to thermally connect the battery cell to the temperature control element, but also the cell connector. For this purpose, a heat transfer extension extends from the temperature control element. This heat transfer extension is therefore either in contact with or attached to the temperature control element. Extending from the temperature control element, the heat transfer extension also lies between the battery cells. For example, the heat transfer extension forms an angle with the temperature control element or the temperature control surface that is greater than 0° and less than 180°. Particularly preferably, the angle is at least 60° and at most 120°, at least 75° and at most 105°, or approximately or exactly 90°.

[0027] The heat transfer element, which engages between the battery cells, is positioned between the battery cells against the cell connector, thus transferring heat. Heat generated at or within the cell connector is transferred from the connector to the heat transfer element and dissipated via this element towards the temperature control element, specifically up to the temperature control element itself. Conversely, heat can also be transferred from the temperature control element towards the cell connector to warm it. The heat transfer element ensures a more uniform heat distribution, or temperature distribution, between the cell connector and the battery cells, as well as within the battery cells themselves, thereby improving the service life of the traction battery.

[0028] A further development of the invention provides that the heat transfer projection is an engagement projection arranged between the connection terminals of the battery cells and encompassed by the cell connector that electrically connects the connection terminals. This engagement projection represents a first variant of the heat transfer projection. The engagement projection extends from the temperature control element and reaches between the battery cells in such a way that it is located between the connection terminals. Here, the engagement projection is spaced apart from the connection terminals on both sides; thus, the connection terminals do not touch the engagement projection.

[0029] The terminals are electrically connected to each other via the cell connector. The cell connector is positioned on both sides of the engagement projection and is electrically connected to one of the battery cells on one side and to a second battery cell on the other. For this purpose, the cell connector encompasses the engagement projection on at least one side. For example, in cross-section, the cell connector is U-shaped, meaning it has two connecting legs that are electrically connected to the terminals of the battery cells.

[0030] The connecting legs are spaced apart from each other, in particular parallel to each other. Preferably, the connecting legs are located on opposite sides of the engagement projection, thus accommodating it between them. In cross-section, the connecting legs are connected to each other via a connecting leg. In cross-section, the connecting leg is, for example, round, and in particular, semicircular. In other words, the engagement projection engages the cell connector to temperature-control it on the side facing away from the battery cells or the connection terminals. This achieves effective heat dissipation and / or supply.

[0031] A further development of the invention provides that the engagement projection has dimensions in at least one direction, preferably in at least two mutually perpendicular directions, which at least correspond to the dimensions of the connection terminals in the same direction. The connection terminals each have specific dimensions in the direction or in each of the aforementioned directions. The dimensions of the engagement projection in the respective direction correspond to these dimensions at least or even exceed them. Accordingly, the engagement projection preferably completely overlaps the connection terminals in the direction or directions.

[0032] In particular, the engagement projection extends from the temperature control element into the space between the battery cells in such a way that it protrudes beyond the connection terminals on the side facing away from the temperature control element. Similarly, the engagement projection protrudes beyond the connection terminals in at least one direction on opposite sides. Preferably, this applies to the multiple directions perpendicular to each other. This results in a large effective surface area of ​​the engagement projection available for heat transfer, thus ensuring effective temperature control of the cell connector.

[0033] A further development of the invention provides that the cell connector defines a cavity into which the engagement projection engages. The cavity is bounded by the cell connector on opposite sides in at least one first direction. In a second direction perpendicular to the first direction, the cavity is preferably bounded by the cell connector on only one side, and in a third direction perpendicular to both the first and second directions, the cavity is open on both sides and is therefore not bounded by the cell connector. For example, the cavity is located between the aforementioned connecting legs and the connecting leg of the cell connector.

[0034] The engagement projection engages in the cavity in such a way that a heat-transferring connection is established between the cell connector and the engagement projection. For example, the engagement projection rests against the cell connector, at least partially, preferably over its entire surface. This also ensures effective temperature control of the cell connector.

[0035] A further development of the invention provides that the engagement projection is connected to the cell connector via a thermally conductive medium for heat transfer. The thermally conductive medium is arranged between the engagement projection and the cell connector to improve heat transfer between them. For example, the cavity is at least partially filled with the thermally conductive medium.

[0036] A further development of the invention provides that the heat transfer projection is a mounting projection that at least partially accommodates the cell connector. This mounting projection represents a second variant of the heat transfer projection. The mounting projection also extends from the temperature control element between the battery cells. However, unlike the engagement projection, it does not engage with the cell connector, but rather partially accommodates it. In other words, the mounting projection at least partially surrounds the cell connector and makes contact with it in a heat-transferring manner.

[0037] Preferably, the mounting projection extends less far between the battery cells than the engagement projection. In particular, the mounting projection is spaced apart from an imaginary plane that passes through both connection terminals, especially perpendicular to them. This imaginary plane intersects, for example, the connection terminals on their side facing the temperature control element, from which the mounting projection originates. With such a design of the heat transfer projection, good temperature control of the cell connector is also achieved.

[0038] A further development of the invention provides that the mounting projection has a cell connector receptacle which is bounded by a mounting wall against which the cell connector rests in a heat-transferring manner. The cell connector receptacle is formed as a recess in the mounting projection. It is bounded on one side by the mounting wall, and on the other side it is open or has an opening through which the cell connector engages.

[0039] The mounting wall is shaped to fit the cell connector. This means that the contour of the mounting wall at least resembles or completely matches the outer contour of the cell connector on its side facing the mounting wall. This ensures that the cell connector makes full contact with the mounting wall, thus guaranteeing good heat transfer between them. Preferably, the mounting wall is round in cross-section, particularly semicircular. Even with this design of the traction battery, reliable and efficient temperature control of the cell connector is achieved.

[0040] A further development of the invention provides that the mounting projection has a locking device and is positively locked to the cell connector by means of this locking device. The locking device serves to positively lock the mounting projection to the cell connector in order to establish a reliable thermal connection between them. The locking device encompasses the cell connector in at least one direction, in particular in the third direction already mentioned. In particular, the locking device is located on opposite sides of the cell connector and projects positively into the cell connector on these opposite sides, in particular into the cavity.

[0041] The locking device preferably consists of a flexible, particularly elastic, material that allows it to be snapped into place on the cell connector. The locking device can be integrally formed with the mounting projection and made of the same material. However, it can also be made of a different material than the mounting projection and subsequently attached to it. In either case, the aforementioned advantages are achieved.

[0042] A further development of the invention provides that the mounting projection encompasses the cell connector and rests against the connection terminals on opposite sides. It has already been mentioned that the mounting projection partially incorporates the cell connector. In doing so, it at least partially encompasses the cell connector. This encompassing occurs in such a way that the mounting projection rests against the connection terminals on opposite sides of the cell connector, thus bearing against them. Preferably, this establishes a thermal connection between the mounting projection and the connection terminals, so that both the cell connector and the connection terminals are directly temperature-controlled or can be temperature-controlled by means of the mounting projection. This results in particularly efficient temperature control.

[0043] A further development of the invention provides that the cell module is a first cell module, the battery cell arrangement is a first battery cell arrangement with first battery cells, the temperature control element is a first temperature control element, and the temperature control surface is a first temperature control surface, and in addition to the first cell module, a second cell module with a second battery cell arrangement and a second temperature control element is provided, wherein the second temperature control element is arranged on a side of the first battery cell arrangement opposite the first temperature control element and is in contact with the first battery cells via a second temperature control surface in a heat-transferring manner.

[0044] The traction battery comprises several cell modules, namely at least the first and second cell modules. In principle, any number of such cell modules can be present, with each pair of cell modules being adjacent to one another. For example, the cell modules can be directly adjacent to each other. Each cell module has a battery cell assembly with several battery cells and a temperature control element with a temperature control surface. If a mounting frame is provided, each cell module also has such a frame, which connects the respective battery cell assembly and the respective temperature control element. It is possible for the mounting frames of the cell modules to be designed as a single, unified frame, meaning that the mounting frames are manufactured as a single piece and / or from a single material.The mounting frames can of course also be separate from each other and attached to each other.

[0045] The cell modules are preferably identical in design. The multiple cell modules together form the aforementioned battery module; accordingly, they are preferably arranged together between two end plates and clamped together using the clamping device. At least one such battery module is arranged in the battery housing of the traction battery.

[0046] At least one of the battery cell assemblies of the cell modules is arranged between two temperature control elements of the cell modules, namely between the first and second temperature control elements. The battery cell assembly is thermally coupled to the temperature control elements or their temperature control surfaces on opposite sides, for example, using a thermal interface material. Thus, the first temperature control element of the first cell module is located on one side of the battery cell assembly, and the second temperature control element of the second cell module is located on the other side. The battery cell assembly is thermally connected to both, preferably with a thermal interface material. Such an arrangement enables particularly effective temperature control of the battery cell assembly or of multiple battery cell assemblies.

[0047] A further development of the invention provides that the heat transfer projection is configured as a first heat transfer projection in the form of an engagement projection, and that the temperature control device, in addition to the first heat transfer projection, has a second heat transfer projection in the form of a mounting projection. This means that the traction battery or the cell module does not have just a single heat transfer projection, but several heat transfer projections, which are configured differently.

[0048] The first heat transfer protrusion is a contact protrusion, and the second is a contact protrusion. The contact protrusion and the contact protrusion engage between the battery cells from opposite sides, specifically between the same battery cells. Therefore, the contact protrusion and the contact protrusion are thermally connected to the same cell connector, or rather, they make contact with the same cell connector for heat transfer. In other words, the cell connector is held between the contact protrusion and the contact protrusion, specifically clamped between them. This enables particularly effective temperature control of the cell connector.

[0049] A further development of the invention provides that the first heat transfer projection extends from the first temperature control element and the second heat transfer projection from the second temperature control element, so that the first heat transfer projection and the second heat transfer projection extend between the battery cells from opposite sides and accommodate the cell connector between them. This has already been mentioned.

[0050] The features and combinations of features described in the description, in particular those described in the following figure description and / or shown in the figures, can be used not only in the combinations specified, but also in other combinations or individually, without departing from the scope of the invention, in particular the scope of the claims. Thus, embodiments that are not explicitly shown or explained in the description and / or the figures, but which emerge from or can be derived from the explained embodiments, particularly within the scope of the claims, are also to be considered as encompassed by the invention.

[0051] The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawing, without limiting the invention. The drawing shows: Fig. 1 a schematic representation of an area of ​​a traction battery in a longitudinal section view, as well as Fig. 2 A schematic representation of the traction battery in a cross-sectional view.

[0052] The Fig. Figure 1 shows a schematic longitudinal section of a portion of a traction battery 1 for a motor vehicle. The traction battery 1 comprises a first cell module 2 and a second cell module 3. Of the first cell module 2, a battery cell arrangement 4 and a first temperature control element 5 of a temperature control unit 6 are shown. Of the second cell module 3, only a second temperature control element 7 is shown, which is also part of the temperature control unit 6. Preferably, the second cell module 3 comprises a battery cell arrangement, which is not shown here.

[0053] The battery cell arrangement 4 comprises at least a first battery cell 8 and a second battery cell 9. Each of the battery cells 8 and 9 has connection terminals 10, which are designed and configured for electrically connecting the battery cells 8 and 9 to each other and to terminals of the traction battery 1. The battery cells 8 and 9 are spaced apart from each other, so that there is a gap between their mutually facing connection terminals 10. A cell connector 11 is connected to these connection terminals 10 for electrically connecting the battery cells 8 and 9. The cell connector 11 engages the connection terminal 10 of the first battery cell 8 on one side and the connection terminal 10 of the second battery cell 9 on the other, and is electrically connected to them.

[0054] For temperature control of battery cells 8 and 9, cell modules 2 and 3 have temperature control elements 5 and 7, which are part of the temperature control unit 6. Each of the temperature control elements 5 and 7 has a temperature control surface 12 or 13, respectively, which is in contact with both battery cells 8 and 9 of the battery cell assembly 4 and thus transfers heat. The temperature control surfaces 12 and 13 are located, for example, on a jacket 14 or 15 of the respective temperature control element 5 or 7. Cooling plates 16 and 17 are incorporated in the jackets 14 and 15, respectively. At least one fluid channel is provided in each of the cooling plates 16 and 17, which is supplied with a fluid, at least temporarily, for temperature control of the battery cell assembly 4.

[0055] Each of the temperature control elements 5 and 7 extends a heat transfer projection 18 or 19, respectively. The heat transfer projection 18 is designed as an engagement projection, and the heat transfer projection 19 as a mounting projection. The meaning of these terms is immediately apparent from the illustration. The engagement projection 18 engages the cell connector 11, specifically a cavity 20 bounded by the cell connector 11. The engagement projection 18 extends between the connection terminals 10; in cross-section, it projects beyond them on both sides.

[0056] The mounting projection 19 is arranged outside the cell connector 11. It has a cell connector receptacle 21 that receives the cell connector 11, at least partially. For example, the mounting projection 19 extends so far towards the connection terminals 10 that it partially abuts them. This ensures temperature control of both the cell connector 11 and the connection terminals 10. The mounting projection 19 is preferably positively locked to the cell connector 11 by means of a locking device 22.

[0057] The Fig.Figure 2 shows a schematic representation of the traction battery 1 in a further sectional view, namely in cross-section. It is now clearly visible that the locking device 22 engages positively in the cell connector 11 or its cavity 20 from opposite sides. This ensures a reliable hold of the mounting projection 19 on the cell connector 11, so that ultimately the cell connector 11 reliably contacts the mounting projection 19 in a heat-transferring manner. This also serves to reliably regulate the temperature of the battery cell assembly 4. REFERENCE MARK LIST: 1 traction battery 2 1. Cell module 3 2. Cell module 4 Battery cell arrangement 5 1. Temperature control element 6 Temperature control unit 7 2. Temperature control element 8 1. Battery cell 9 2. Battery cell 10 connection terminals 11 cell connectors 12 temperature control surfaces 13 temperature control surfaces 14 coat 15 coat 16 Cooling plate 17 Cooling plate 18 Heat transfer advantage 19 Heat transfer advantage 20 cavity 21 cell connector uptake 22 Resting device QUOTES INCLUDED IN THE DESCRIPTION

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

[0000] DE 10 2016 116 581 A1

[0002] DE 10 2019 217 766 A1

[0003] DE 10 2011 001 371 A1

[0004]

Claims

Traction battery (1) for a motor vehicle, comprising a cell module (2) having a battery cell arrangement (4) and a temperature control device (6) for temperature control of the battery cell arrangement (4), wherein a cell connector (11) is arranged between each pair of battery cells (8, 9) of the battery cell arrangement (4), which is connected to connection terminals (10) of the battery cells (8, 9) to establish an electrical connection between the battery cells (8, 9), characterized in that the temperature control device (6) has a temperature control element (5) having at least one fluid channel and a temperature control surface (12) on which the battery cells (8, 9) bear in a heat-transferring manner, wherein a heat transfer projection (18, 19) extends from the temperature control element (5), which extends between the battery cells (8, 9) and bears in a heat-transferring manner against the cell connector (11). Traction battery according to claim 1, characterized in that the heat transfer projection (18, 19) is an engagement projection (18) which is arranged between the connection terminals (10) of the battery cells (8, 9) and is encompassed by the cell connector (11) which electrically connects the connection terminals (10) to each other. Traction battery according to one of the preceding claims, characterized in that the engagement projection (18) has dimensions in at least one direction which at least correspond to the dimensions of the connection terminals (10) in the same direction. Traction battery according to one of the preceding claims, characterized in that the heat transfer projection (18, 19) is a mounting projection (19) that accommodates the cell connector (11) at least partially. Traction battery according to one of the preceding claims, characterized in that the system projection (19) has a cell connector receptacle (21) which is bounded by a system wall on which the cell connector (11) rests in a heat-transferring manner. Traction battery according to one of the preceding claims, characterized in that the mounting projection (19) has a locking device (22) and is positively locked to the cell connector (11) by means of the locking device (22). Traction battery according to one of the preceding claims, characterized in that the mounting projection (19) surrounds the cell connector (11) and rests against the connection terminals (10) on opposite sides. Traction battery according to one of the preceding claims, characterized in that the cell module (2) is a first cell module (2), the battery cell arrangement (4) is a first battery cell arrangement (4) with first battery cells (8, 9), the temperature control element (5) is a first temperature control element (5) and the temperature control surface (12) is a first temperature control surface (12) and in addition to the first cell module (2) a second cell module (3) with a second battery cell arrangement and a second temperature control element (7) is provided, wherein the second temperature control element (7) is arranged on a side of the first battery cell arrangement (4) opposite the first temperature control element (5) and is in contact with the first battery cells (8, 9) with a second temperature control surface (13) in a heat-transferring manner. Traction battery according to one of the preceding claims, characterized in that the heat transfer projection (18, 19) is designed as a first heat transfer projection (18) in the form of the engagement projection (18) and the temperature control device (6) has, in addition to the first heat transfer projection (18), a second heat transfer projection (19) in the form of the mounting projection (19). Traction battery according to one of the preceding claims, characterized in that the first heat transfer projection (18) extends from the first temperature control element (5) and the second heat transfer projection (19) extends from the second temperature control element (7), such that the first heat transfer projection (18) and the second heat transfer projection (19) extend from opposite sides between the battery cells (8, 9) and accommodate the cell connector (11) between them.

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