Battery cell module and method for its manufacture

Abstract

Battery cell module (21), comprising - a plurality of circuit boards (3), each having fixing agents (4) on at least one side of the circuit board (3), - a plurality of energy storage cells (5), wherein the energy storage cells (5) are arranged on the fixing means (4) such that a plurality of each circuit board (3) together with fixing means (4) arranged thereon with the energy storage cells (5) forms a sandwich-like arrangement (6), wherein the plurality of energy storage cells (5) are arranged side by side in the form of the sandwich-like arrangement (6) along a stacking direction (S), and - at least one cooling element (27) extending along the stacking direction (S) with receptacles, which is materially bonded and preferably additionally form-fitted to the circuit boards (3) in the receptacles along the stacking direction (S), wherein the openings (28) in the cooling element (27) are designed to extend through such openings that end sections (8) of the circuit boards (3) arranged in these openings (28) are accessible from one side of the cooling element (27) facing away from the energy storage cells (5), wherein the circuit board (3) is a plate-shaped, thermally conductive material, wherein the cooling element (27) has a one-piece formed cooling plate (27a,b) which extends at least partially along three sides of the sandwich-like arrangement (6), wherein at circuit board projections (33) of the circuit boards (3) which extend beyond the energy storage cells (5) there is a welded connection between the circuit board (3) and the cooling plate (27a,b).

Description

[0001] The invention relates to a battery cell module and a manufacturing method for such a battery cell module. Battery cell modules are used in many fields, particularly in electric or hybrid vehicles.

[0002] Such a battery cell module comprises, for example, a plurality of circuit boards, each with fixing elements on at least one side, and a plurality of energy storage cells. The energy storage cells are arranged on the fixing elements such that each circuit board, together with the fixing elements attached to it, forms a sandwich-like arrangement with at least one energy storage cell, wherein the plurality of sandwich-like arrangements are arranged along a stacking direction. Furthermore, the battery cell module includes a cooling element. The energy storage cells should be operated within a defined temperature range to achieve the best possible service life and performance.The thermal resistance between the cooling element and the energy storage cells should be as low as possible to ensure effective cooling (or temperature control) of the energy storage cells and to prevent heat buildup at the interface between the energy storage cell and the cooling element. Simultaneously, a stable battery cell module design is required that can withstand the vibrations of vehicle operation. DE 102010005154 A1 proposes a cooling element extending along the stacking direction with receptacles for cooling the energy storage cells. This element is materially and / or form-fit connected to the circuit boards in the receptacles along the stacking direction. The circuit board is designed with protrusions that are inserted into the cooling element, allowing them to be surrounded by a cooling medium flowing within the cooling element.Air gaps can form between the components, particularly due to vibrations, which significantly impair heat dissipation and reduce the holding properties of the battery cell module.

[0003] DE 10 2009 039 394 A1 describes a cooling plate for a galvanic cell and a method for attaching a cooling plate.

[0004] DE 10 2010 018 040 A1 discloses a method for manufacturing a cooling module.

[0005] DE 10 2011 011 650 A1 shows a U-shaped cooling plate with massive ribs for lithium pouch cells.

[0006] The present invention is therefore based on the objective of providing a battery cell module that has a simple and cost-effective cooling option for the energy storage cells, while at the same time providing a stable holding option even when vibrations occur.

[0007] This problem is solved by a battery cell module having the features of claim 1 and by a method having the features of claim 5.

[0008] The cooling element's recesses are designed as through-openings, allowing access to the circuit board end sections arranged within these openings from the side of the cooling element facing away from the energy storage cells. The invention is based on the understanding that the design of the battery cell module's cooling element provides effective cooling and a stable mounting option for the sandwich-like arrangements.

[0009] The circuit boards are made of a thermally conductive material. For example, they are made of aluminum. Other materials with thermal conductivity comparable to aluminum can also be used for the circuit boards. The circuit boards are preferably flat, meaning they have a large surface area relative to their volume. Each circuit board is plate-shaped so that a large portion of its two opposing surfaces can be coupled to an energy storage cell. Due to the flat design of the circuit boards, materials with lower thermal conductivity than aluminum can also be used.

[0010] The fixing materials used to connect the circuit boards to the energy storage cells are, for example, thermally conductive but electrically sufficiently insulating adhesive films. Such adhesive films are available, for example, from 3M (St. Paul, USA). At least one additional layer, such as an insulating layer, may be placed between the fixing material and the energy storage cell and / or circuit board.

[0011] The energy storage cells are preferably lithium-ion cells. However, they can also be any electrochemical or electrostatic energy storage cells, such as lead-acid batteries, nickel-metal hydride cells, nickel-cadmium cells, zinc-air cells, lithium-air cells, nickel-zinc cells, fuel cells, or double-layer capacitors. Energy storage cells in a soft-pack design are particularly suitable, as they feature a welded aluminum composite foil casing for the electrodes.

[0012] The circuit board is preferably adapted to the shape of the energy storage cell but dimensioned in such a way that it is in contact with the at least one cooling element, while the at least one energy storage cell arranged on it is not in contact with the at least one cooling element.

[0013] The sandwich-like arrangement, comprising a circuit board, fixing means, and at least one energy storage cell, can be designed such that one side of the circuit board has fixing means to which an energy storage cell is attached. According to the invention, the sandwich-like arrangement is configured such that the circuit board has fixing means on two opposite plate-shaped sides, each with an energy storage cell attached thereto, so that two energy storage cells surround the fixing means and the circuit board on two sides. The circuit board has protrusions that extend beyond the energy storage cells to allow a connection between the circuit board and the cooling element without the energy storage cells coming into contact with the cooling element.

[0014] The term "material-bonded connection" means that the bonding partners are held together by atomic or molecular forces. It represents a permanent bond that can only be broken by destroying the bond. Material-bonded connections are typically created using techniques such as welding or soldering.

[0015] The term "positive locking connection" means that a connection is formed by the interlocking of at least two connecting partners. The connection is detachable. A positive locking connection within the meaning of the present invention is also achieved through techniques such as flanging or crimping, even if a complete positive locking connection is not intended.

[0016] According to the invention, the at least one cooling plate is formed in one piece and extends at least partially along three sides of the sandwich-like arrangement. The one-piece construction of the cooling plates has the advantage that they do not need to be assembled from several parts that must be joined together. Rather, the cooling plate can be connected to the sandwich-like arrangements by bending processes such as flanging or crimping.

[0017] In a preferred embodiment, the plurality of circuit boards each have at least one circuit board projection arranged in an opening and connected to the at least one cooling element. Each circuit board preferably has at least one circuit board projection, in particular a cooling fin, on each side connected to the at least one cooling element. For the purposes of the invention, a cooling fin is a circuit board area that is freestanding relative to the energy storage cell, i.e., a portion of the circuit board edge projects beyond the edge of the energy storage cell. In this embodiment, the energy storage cells are bonded to the plate-shaped area of ​​the circuit board, so that the at least one circuit board projection is not surrounded by the energy storage cells. The at least one circuit board projection serves in particular for connection to the cooling element.Preferably, the circuit boards have an energy storage cell glued to each of two opposite sides in the plate-shaped area and at least one circuit board projection on each of three sides, by means of which the circuit board is connected to the at least one cooling element, so that the at least one cooling element is arranged on three sides of the sandwich-like arrangement. In this embodiment of the battery cell module, end sections of the circuit board projections arranged in the openings of the cooling element are accessible from the side of the cooling element facing away from the sandwich-like arrangement.

[0018] The temperature control of the energy storage cells is preferably based on liquid cooling, which offers significantly greater heat dissipation potential compared to air cooling. Preferably, the at least one cooling element has a cooling line that is materially and preferably also form-fitted to the majority of circuit boards. For example, the cooling line and the circuit boards are welded together. The cooling line is preferably designed as a harp-shaped tube. That is, the cooling line has a tube structure in which at least two parallel or substantially parallel tubes are further connected by tubes running perpendicular or substantially perpendicular to them, with openings formed between the tubes so that the cooling line has openings in which the circuit boards or circuit boards can be inserted.The circuit board projections can be arranged and connected such that they are accessible from the side of the cooling line facing away from the sandwich-like arrangements. The vertically or substantially vertically arranged tubes are positioned vertically or substantially vertically to the stacking direction of the sandwich-like arrangements. That is, the sandwich-like arrangements are positioned in the battery cell module in the stacking direction such that the circuit boards are connected to the vertically or substantially vertically running tubes. In this embodiment, the tubes running parallel or substantially parallel to each other, which extend parallel or substantially parallel to the stacking direction of the sandwich-like arrangements, are preferably designed such that they surround the at least one circuit board projection. In this way, the sandwich-like arrangements can be enclosed in a cage-like manner.The cooling line can be connected to the sandwich-like arrangements on one or two, preferably three sides of them.

[0019] If, for example, the majority of circuit boards each have a protrusion, two parallel tubes can be connected to these protrusions, extending along the stacking direction of the sandwich-like arrangements. Perpendicular tubes can then be arranged, running parallel to each protrusion. This allows the sandwich-like arrangements to be cooled both along the stacking direction and along the protrusion. This achieves efficient cooling of the battery cell module, which simultaneously incorporates an integrated support structure. In this embodiment, a metallurgical bond between the cooling element and the circuit board is advantageous.

[0020] In a preferred embodiment, the at least one cooling element comprises at least one cooling plate and at least one cooling line arranged thereon, wherein the cooling plate has openings for receiving the plurality of circuit boards and is connected to the plurality of circuit boards. The circuit boards are bonded to the cooling plate by a material connection and preferably by a form-fit connection, while the cooling line is attached to the side of the cooling plate facing away from the sandwich-like arrangements. The openings of the cooling plate are preferably designed to be complementary to the circuit boards or circuit board projections to be arranged in them. Receiving the circuit boards in the complementary openings provides an additional holding property for the sandwich-like arrangements. The cooling plate is preferably dimensioned such that it extends along all sandwich-like arrangements in length and width, i.e., in the stacking direction and perpendicular thereto.The cooling line is, for example, a meandering cooling coil designed to effectively cool the battery module. For instance, the cooling coil has cooling coil sections running parallel and perpendicular to the stacking direction of the sandwich-like arrangements, which are attached to the at least one cooling plate in such a way that they do not cover the openings formed in the cooling plate. The cooling line sections running essentially parallel to the stacking direction of the sandwich-like arrangements are preferably arranged between edge sections of the cooling plate and the openings formed therein, as well as between the openings themselves, while the cooling line sections running essentially perpendicular to the stacking direction of the sandwich-like arrangements are preferably arranged between edge sections of the cooling plate and the openings formed therein, so that the cooling line has a meandering shape.

[0021] Preferably, the openings in the cooling plate are designed to be complementary to the at least one protrusion of the plurality of circuit boards, such that each protrusion is located in an opening. If the circuit board has several protrusions on a side to be connected to the cooling element, the cooling element has correspondingly complementary openings. That is, multiple openings can extend not only in the stacking direction of the sandwich-like arrangements but also perpendicular to the stacking direction.

[0022] The cooling line is made of a material with good thermal conductivity. During operation, a cooling medium flows through the cooling line. The cooling medium can be a gas such as air or a liquid such as water or a water-glycol mixture. Preferably, a liquid with advantageous heat absorption and heat dissipation properties is used as the cooling medium.

[0023] In a preferred embodiment, the at least one cooling plate has at least one cooling plate projection adjacent to each opening, which extends towards the side of the cooling plate facing away from the sandwich-like arrangement.

[0024] The cooling plate projection is preferably designed such that it is flush with the respective end section of the plurality of circuit boards or their circuit board projections, which is arranged in the opening of the cooling plate. By means of this design, the cooling plate projection is suitable for being materially and / or form-fit connected to the plurality of circuit boards or their circuit board projections.

[0025] A method for manufacturing a battery cell module comprises the following steps: providing a plurality of sandwich-like arrangements, each comprising a circuit board, fixing means arranged on at least one side of the circuit board, and at least one energy storage cell, wherein the at least one energy storage cell is arranged on the fixing means such that each circuit board, together with the fixing means arranged thereon, forms a sandwich-like arrangement with at least one energy storage cell; and materially bonding and preferably additionally form-fitting connecting the plurality of the sandwich-like arrangements with at least one cooling element extending along the stacking direction, with receptacles designed as openings through the cooling element.wherein end sections of the circuit boards arranged in these openings are connected to the cooling element by a material bond and preferably also by a form-fit bond from one side of the cooling element facing away from the energy storage cells.

[0026] The step of materially bonding and preferably additionally positively bonding the majority of sandwich-like arrangements with at least one cooling element extending along the stacking direction and having receptacles preferably includes a step of inserting the majority of the circuit boards into the openings. Inserting the majority of the circuit boards into the openings is a simple and cost-effective process step. This type of connection is an example of a positive-locking connection. Preferably, the openings are designed to be complementary to the circuit boards in order to ensure a stable hold for them. This connection technique is advantageous, for example, if only one side of the sandwich-like arrangement is to be provided with a cooling element.

[0027] In a preferred embodiment, the step of materially bonding and preferably additionally form-fitting the majority of sandwich-like arrangements with at least one cooling element extending along the stacking direction and having receptacles includes a bending step of the cooling element, where bending is understood to mean any forming process. Bending can be achieved, for example, by flanging the cooling element. Another example of a bending technique is clinching, also known as press joining. The forming joining technique is advantageous, for example, when only several sides of the sandwich-like arrangements are to be provided with a cooling element. This joining technique allows a one-piece cooling element to be used to connect arrangements with a cooling element on several sides.

[0028] According to the invention, the step of joining the plurality of sandwich-like arrangements with at least one cooling element extending along the stacking direction and having receptacles in a material-bonded and preferably additionally form-bonded manner comprises the step of welding the cooling element to the plurality of circuit boards. The welding can be carried out, for example, by means of a laser welding process. Welding represents a material-bonded joining method.

[0029] The battery cell module described above and manufactured according to the method described above is used in particular in a hybrid or electric vehicle.

[0030] Further aspects of the invention are explained using figures:

[0031] They show: Fig. 1a a cross-sectional view of a battery cell module; Fig. 1b another cross-sectional view of the in Fig. 1a shown battery cell module; Fig. 2 a partial cross-sectional view of a battery cell module according to the invention; Fig. 3 a top view of a circuit board, Fig. 4a a top view of a cooling element, Fig. 4b a cross-sectional view of the in Fig. 4a shown cooling element, Fig. 5. Figuratively, the creation of a sandwich-like arrangement, Fig. 6 and Fig. 7 schematically the production of the in Fig. 2 battery cell modules shown, Fig. 8 a side view in Fig. 2 battery cell modules shown, Fig. 9 another cross-sectional view of the in Fig. 8 battery cell modules shown, and Fig. 10 schematically the production of the in Fig. 1a and Fig. Battery cell module shown in 1b.

[0032] Fig. Figure 1a shows a cross-sectional view of a battery cell module 1. The battery cell module 1 comprises three circuit boards 3, six adhesive films (not shown), six energy storage cells 5, and six cooling elements 7 in the form of cooling lines 7a. Each circuit board 3 is connected on two opposite sides to one energy storage cell 5 each by means of a thermally conductive adhesive film, to form a sandwich-like arrangement 6. The Fig. The gaps shown in Figure 1a between the energy storage cells 5 and the circuit boards 3 do not exist in reality and serve only to visualize the circuit boards 3 between the energy storage cells 5. The three sandwich-like arrangements 6 are arranged side by side in the stacking direction S, with gaps possible between the sandwich-like arrangements. Each circuit board 3 has two circuit board projections 33 that extend beyond the edge sections of the energy storage cells. The circuit board projections 33 are each connected to a cooling line 7a, for example, by welding. The end sections of the circuit board projections 33 are accessible from the side of the cooling element 7 facing away from the sandwich-like arrangements.

[0033] Fig. 1b shows another cross-sectional view of the in Fig. 1a shown battery cell module 1. In the in Fig. The cross-sectional view shown in Figure 1b illustrates that the cooling lines 7a, depicted with dashed lines, are connected to each other via a cooling line 7b that extends parallel to the stacking direction S. The cooling lines 7a and 7b together form the cooling element 7 and are designed as a single-piece piping system that surrounds the circuit board projections like a cage but is not in direct contact with the energy storage cells.

[0034] During operation of the battery cell module 1, a cooling medium such as a water-glycol mixture is circulated through the cooling lines 7a and 7b to cool the energy storage cells 5. The arrangement of the cooling lines 7a and 7b on the circuit board projections 33 cools the circuit boards 3, which in turn cool the energy storage cells 5 attached to them by virtue of their arrangement on the adhesive films.

[0035] Fig. Figure 2 shows a partial cross-sectional view of another battery cell module 21. The battery cell module 21 has sandwich-like arrangements 6, three of which are shown. The sandwich-like arrangements 6 are arranged side by side in the stacking direction S, with gaps potentially present between the sandwich-like arrangements. Each sandwich-like arrangement 6 has a circuit board 3 with two adhesive films (not shown) arranged on opposite sides of the circuit board 3 and two energy storage cells 5 arranged thereon. The gaps shown between the energy storage cells 5 and the circuit boards 3 do not exist in reality and serve only to visualize the circuit boards 3 between the energy storage cells 5. Each circuit board 3 has circuit board projections 33 that extend beyond edge sections of the energy storage cells 5.Furthermore, the battery cell module 21 has a cooling element 27, which is positively and, if necessary, materially bonded to the circuit board projections 33 of the circuit boards 3. The cooling element 27 has a cooling line 27a and a cooling plate 27b, which are connected to each other, for example, by welding. The cooling plate 27b has openings 28 into which the circuit board projections 33 are inserted, so that the circuit boards 3 are positively bonded to the cooling plate 27b. The cooling plate 27b has a cooling plate projection 29 adjacent to each opening 28. For additional stability of the battery cell module 21, the circuit board projection 33 can be welded to the cooling plate projection 29. End sections 8 of the circuit board projections 33 are accessible in the openings 28 from one side of the cooling element 27 facing away from the energy storage cells.

[0036] When the battery cell module 21 is in operation, a cooling medium, such as a water-glycol mixture, is circulated through the cooling lines 27a to cool the energy storage cells 5. The cooling line 27a is connected to the cooling plate 27b, which in turn cools the circuit boards 3 through its connection to the circuit board projections 33. The circuit boards 3, in turn, cool the energy storage cells 5 attached to them through their connection to the adhesive films.

[0037] Fig. Figure 3 shows a top view of a circuit board 3. The circuit board 3 has a top side O, a right side R, a bottom side U, and a left side L, the designations of the sides being arbitrary. The circuit board 3 has a plate-like shape with circuit board projections 33 arranged on the left side L, the right side R, and the bottom side U. The right side R, the bottom side U, and the left side L are designed to accommodate, for example, a cooling plate such as the one described in [reference missing]. Fig. 2 shown to be connected, since the circuit board projections 33 fit into the openings of the in Fig. The cooling plate shown in Figure 2 can be inserted. The circuit board 3 is dimensioned such that energy storage cells can be arranged on it in such a way that the circuit board projections 33 extend beyond the energy storage cells or are freestanding. That is, when energy storage cells are arranged on the circuit board 3, they cover the plate-shaped areas of the circuit board 3 except for the circuit board projections 33.

[0038] Fig. Figure 4a shows a top view of a cooling element 27 before its installation in a battery cell module such as the one in Fig. The battery cell module 21 shown in Figure 2. The cooling element 27 has a cooling line 27a and a cooling plate 27b. The cooling plate 27b has openings 28. In the stacking direction S, in which sandwich-like arrangements of circuit board, adhesive films, and energy storage cells are to be arranged side by side to manufacture the battery cell module, the cooling plate 27b has ten openings, so that ten sandwich-like arrangements can be arranged side by side in the cooling plate 27b. The cooling plate 27b is formed by means of bending lines B with a first cooling plate area 27b1, a second cooling plate area 27b2, and a third cooling plate area 27b3.When the cooling element 27 is connected to sandwich-like arrangements for the production of the battery cell module, the cooling plate 27 is bent along the bending lines B such that the second cooling plate area 27b2 forms the bottom of a battery cell module, and the first cooling plate area 27b1 and the third cooling plate area 27b3 form side areas of the battery cell module. The cooling element 27 will then extend in the stacking direction S along three sides of the sandwich-like arrangements. The in . Fig. The cooling plate 27b shown in 4a is suitable for use with the one in Fig. The circuit board 3 shown in Figure 3 is to be connected. The openings 28 of the cooling plate 27b are complementary to the circuit board projections 33 of the circuit board shown in Figure 3. Fig. The cooling line 27a is formed on the cooling plate 27b as shown in Figure 3. The cooling line 27a is arranged on the cooling plate 27b such that it does not cover the openings 28, allowing access to the end sections of the circuit boards arranged in the openings 28 from the side of the cooling plate 27b facing away from the sandwich-like arrangements in a finished battery cell module. The cooling line 27a has two terminals 24. The cooling line 27a is designed such that it has cooling line sections 27a1 running substantially parallel to the stacking direction S and cooling line sections 27a2 running substantially perpendicular to the stacking direction S, such that the cooling line sections 27a2 run substantially parallel to the openings 28 in the edge regions of the cooling plate, and the cooling line sections 27a1 run substantially perpendicular to the openings 28 and the circuit boards or sandwich-like arrangements to be arranged therein.Each opening 28 is arranged between the cooling line sections 27a1.

[0039] Fig. Figure 4b shows a cross-sectional view of the cooling element 27 before its connection with sandwich-like arrangements to form a battery cell module. The in Fig. The cooling element 27 shown in 4b is a cross-sectional view of the one described in Fig. 4a shown, but bent along the bending lines B, the cooling element 27 forms a bottom area by bending the second cooling plate area 27b2, which connects two side areas, the two side areas being formed by means of the first cooling plate area 27b1 and the third cooling plate area 27b3. The in Fig. The cooling line 27a shown in Figure 4a is located on the outside of the cooling plate 27b after the cooling element 27 has been bent, i.e., on the side facing away from the sandwich-like arrangements to be installed, wherein in Fig. 4b the cooling line areas 27a1 are visible.

[0040] Fig. Figure 5 illustrates the production of a sandwich-like arrangement 6, as seen in the Fig. 1a, Fig. 1b and Fig. 2 is shown. The circuit board 3 is provided with fixing agents 4, such as an adhesive film, on opposite sides, and each fixing agent 4 is provided with an energy storage cell 5 to create the sandwich-like arrangement 6. In Fig. Fixing medium and energy storage cells are arranged on two sides of the circuit board. However, a one-sided arrangement of the fixing medium and energy storage cells is also conceivable. The fixing medium and energy storage cells are arranged on the circuit board such that the circuit board projection 33 is not covered by the fixing medium and energy storage cells. Rather, the circuit board projection 33 extends beyond the edge sections of the energy storage cells 5. The energy storage cells 5 each have a battery suspension element 50.

[0041] Fig. 6 and Fig. Figure 7 schematically shows the production of the battery cell module 21. For the production of the battery cell module 21, the following are used: Fig. 4a and Fig. 4b shows the cooling element 27 and the sandwich-like arrangements 6, as shown, for example, in accordance with Fig. 5 are manufactured. The energy storage cell 5 is arranged on a circuit board, of which the circuit board projections 33 are visible. The in Fig. The cooling element 27 shown in Figure 4b is bent open, as indicated by the arrows. The sandwich-like arrangements 6 are inserted into the space shown in the Fig. The circuit board projections 33 are inserted into the openings of the second cooling plate area 27b2, which are not visible, so that the circuit board projections 33 are inserted into the openings in the cooling plate 27b and their end sections 8 are accessible from the side of the cooling element 27 facing away from one of the energy storage cells 5. The first cooling plate area 27b1 and the third cooling plate area 27b3 are then bent in the direction opposite to the arrows such that the sandwich-like arrangements 6 are inserted into the openings in the Fig. Six non-visible openings of the first cooling plate area 27b1 and the third cooling plate area 27b3 are inserted, so that the circuit board projections 33 are arranged in the openings of the cooling plate 27b and their end sections 8 are accessible from one side of the cooling element 27 facing away from the sandwich-like arrangement 6. The cooling line 27a, of which the cooling line sections 27a1 are visible, is arranged on the side of the cooling plate 27b facing away from the sandwich-like arrangement 6. The cooling element 27 and the sandwich-like arrangement 6 are positively connected to each other and can be welded to create a material-bonded connection. The welding is in Fig. 7 shown schematically.

[0042] Fig. Figure 7 shows a partial cross-sectional view of the area after the [unclear text]. Fig. In the process step 6 shown, the battery cell module is manufactured in which the cooling element 27 is welded to the circuit board projections 33 using a laser 70 to create a material-bonded connection. Specifically, the circuit board projections 33 are welded to the cooling plate projections 29, which are arranged adjacent to the openings 28, so that the end sections 8 of the circuit boards 3 are accessible from one side of the cooling element 27 facing away from the energy storage cells 5. After welding, the sandwich-like arrangements 6, arranged side by side in the stacking direction S, are connected via the circuit board projections 33, and the battery cell module 21 is complete.

[0043] Fig. Figure 8 shows a side view of the battery cell module 21. The battery cell module 21 is shown from the side on which the first cooling plate area 27b1 of the cooling plate 27b of the cooling element 27 is located. The sandwich-like assemblies 6 are arranged side by side in the stacking direction S, such that each sandwich-like assembly 6 is inserted into the openings 28 of the cooling plate 27b by means of its circuit board projections 33, and the end sections 8 of the circuit board projections 33 are freely accessible from the side facing away from the energy storage cells 5. The sandwich-like assemblies 6 each have the circuit board 3 with fixing means arranged thereon and energy storage cells 5 thereon, each having a battery suspension element 50. The first cooling plate area 27b1 has, in addition to the cooling plate 27b, the cooling line 27a, which is arranged on the side of the cooling plate 27b facing away from the sandwich-like assemblies 6.The cooling line is further arranged on the cooling plate 27b such that it has first cooling line sections 27a1 running substantially parallel to the stacking direction S and second cooling line sections 27a2 running substantially perpendicular to the stacking direction S. The first cooling line sections 27a1 are arranged between the openings 28 and between the openings 28 and the edge regions of the cooling plate 27b. Every second cooling line section 27a2 is arranged between an edge region of the cooling plate 27b and an opening 28, so that together with the first cooling line sections 27a, they form a meandering cooling line 27a. The cooling line 27a has the connection 24.

[0044] Fig. Figure 9 shows another cross-sectional view of the battery cell module 21. The battery cell module 21 has a sandwich-like arrangement, of which an energy storage cell 5 with the battery suspension elements 50 attached to it, the circuit board projections 33, and the end sections 8 of a circuit board 3 are visible. The battery cell module 21 also includes the cooling element 27 with the cooling plate 27b and the cooling line 27a. The first cooling line sections 27a1 of the cooling line 27a are visible; these are arranged at the first, second, and third cooling plate sections 27b1, 27b2, and 27b3 of the cooling plate 27b. The battery cell module 21 is arranged on a battery base 91 by means of retaining elements 90.

[0045] Fig. Figure 10 schematically shows the production of the in Fig.1a shown battery cell module 1. For the material-bonded connection of the sandwich-like arrangements 6 with the cooling elements 7, these are welded together using the laser device 70. Reference symbol list B Bending lines Left side O upper side R right side S Stacking direction U bottom side 1 battery cell module 3 circuit boards 4 Fixatives 5 Energy storage cell 6 sandwich-like arrangement 7 Cooling element 7a Cooling line 7b Cooling line 8 Final Section 21 battery cell module 24 connection 27 Cooling element 27a Cooling line 27a1 first cooling line area 27a2 second cooling line area 27b Cooling plate 27b1 first cooling plate area 27b2 second cooling plate area 27b3 third cooling plate area 28 Opening 29 Cooling plate protrusion 50 battery suspension element 70 Laser device 90 retaining element 91 Battery base

Claims

[1] Battery cell module (21), comprising - a plurality of circuit boards (3), each having fixing media (4) on at least one side of the circuit board (3), - a plurality of energy storage cells (5), wherein the energy storage cells (5) are arranged on the fixing means (4) such that a plurality of each circuit board (3) together with fixing means (4) arranged thereon with the energy storage cells (5) forms a sandwich-like arrangement (6), wherein the plurality of energy storage cells (5) are arranged side by side in the form of the sandwich-like arrangement (6) along a stacking direction (S), and - at least one cooling element (27) extending along the stacking direction (S) with receptacles, which is materially bonded and preferably additionally form-fitted to the circuit boards (3) along the stacking direction (S) in the receptacles, wherein the openings (28) in the cooling element (27) are designed to extend through such openings that end sections (8) of the circuit boards (3) arranged in these openings (28) are accessible from one side of the cooling element (27) facing away from the energy storage cells (5), wherein the circuit board (3) is a plate-shaped, thermally conductive material, wherein the cooling element (27) has a one-piece formed cooling plate (27a,b) which extends at least partially along three sides of the sandwich-like arrangement (6), wherein at circuit board projections (33) of the circuit boards (3) which extend beyond the energy storage cells (5) there is a welded connection between the circuit board (3) and the cooling plate (27a,b). [2] Battery cell module (21) according to claim 1, characterized by, that the majority of circuit boards (3) each have at least one circuit board projection (33) which is arranged in each opening (28) and is connected to the at least one cooling element (27). [3] Battery cell module (21) according to one of the preceding claims characterized by , that the at least one cooling element (27) has at least one cooling plate (27b) and at least one cooling line (27a) arranged thereon, wherein the cooling plate 27b has the openings (28) for receiving the plurality of circuit boards (3) and is connected to the plurality of circuit boards (3). [4] Battery cell module (21) according to claim 3, characterized by , that the at least one cooling plate (27b) adjacent to each opening (28) has at least one cooling plate projection (29) extending towards the side of the cooling plate (27b) facing away from the sandwich-like arrangement (6). [5] Method for manufacturing a battery cell module (21) comprising the steps - Providing a plurality of sandwich-like arrangements (6), each comprising a circuit board (3), fixing means (4) arranged on at least one side of the circuit board (3), and energy storage cells (5), wherein the energy storage cells (5) are arranged on the fixing means (4) such that each circuit board (3) together with the fixing means (4) arranged thereon with at least one energy storage cell (5) forms a sandwich-like arrangement (6), and - a material-bonded and preferably additionally form-locking connection of the majority of the sandwich-like arrangements (6) with at least one cooling element (27) extending along the stacking direction (S) with receptacles that are designed as openings (28) extending through the cooling element (27), wherein end sections (8) of the circuit boards (3) arranged in these openings (28) are material-bonded and preferably additionally form-locked to the cooling element (27) from one side of the cooling element (27) facing away from the energy storage cells (5), wherein the circuit boards (3) are made of a plate-shaped, thermally conductive material, - wherein a one-piece cooling plate (27a,b) is installed as a cooling element (27), which extends at least partially along three sides of the sandwich-like arrangement (6), - wherein a weld connection is formed between the circuit board (3) and the cooling plate (27a,b) at circuit board projections (33) of the circuit boards (3) that extend beyond the energy storage cells (5). [6] Method according to claim 5, characterized by , that the step of materially bonded and preferably additionally form-fitting connection of the majority of the sandwich-like arrangements (6) with at least one cooling element (27) extending along the stacking direction (S) with receptacles comprises the step of inserting the majority of circuit boards (3) into the openings (28). [7] Method according to claim 5 or 6, characterized by , that the step of materially bonded and preferably additionally form-fitting connection of the majority of the sandwich-like arrangements (6) with at least one cooling element (27) extending along the stacking direction (S) with receptacles includes a step of flanging or crimping the cooling element (27).

Images