Battery cell and battery comprising the battery cell, method for their manufacture

Abstract

Battery cell (102) comprising a cell housing (104) surrounded by an electrically insulating insulating film (106), wherein a cooling plate (108) is arranged within the insulating film (106) and the cooling channel (110) is arranged outside the cell housing (104) and is open at least partially towards the cell housing (104), or the cell housing (104) comprises a cooling channel which is covered by a cooling plate (108) between the insulating film (106) and the cell housing, or the cell housing (104) has spacers which, together with a cooling plate (108) placed thereon, form cooling channels (110) within the insulating film (106), wherein the cooling channel (110) is open towards the cell housing (104) in first sections of the cooling plate (108), and wherein the cooling plate (108) is open in second sections, where no cooling channel is arranged, at the cell housing (104) is attached, the cooling plate (108) having a wave geometry,with wave crests in the first sections and wave troughs in the second sections, wherein the wave crests in the first sections are further away from the cell shell (104) than the wave troughs in the second sections.

Description

[0001] The invention relates to a battery cell and a battery comprising the battery cell and a method for producing the same.

[0002] WO 2015 132786 A1 describes battery cells with cooling plates that form cooling channels through which coolant flows and are arranged on an outer side of a metallic housing, wherein the cooling plates create an electrical connection between adjacent battery cells.

[0003] In the battery cell according to claim 1, a cooling medium can flow directly along a surface of a cell housing of the battery cell within an electrically insulating insulation film surrounding this battery cell.

[0004] The battery cell comprises the cell housing, which is surrounded by the electrically insulating insulation film, wherein a cooling plate comprising a cooling channel is arranged within the insulation film. The cooling channel is arranged outside the cell housing and is open towards the cell housing at least in section, or the cell housing comprises a cooling channel covered by a cooling plate between the insulation film and the cell housing, or the cell housing has spacers which, with a cooling plate placed thereon, form cooling channels within the insulation film. The cooling medium flows directly along the cell surface, i.e. directly along the metal housing or the cell can, within the insulation film of the battery cell. This reduces the thermal resistance, since the insulation film is no longer required as a thermal insulator, and improves the cooling performance.

[0005] In one embodiment, the cooling channel is open toward the cell housing in first sections of the cooling plate, wherein the cooling plate rests against the cell housing in second sections where no cooling channel is arranged. The cooling plate has a wave geometry with wave crests in the first sections and wave troughs in the second sections. The wave crests in the first sections are spaced further from the cell housing than the wave crests in the second sections. This allows the battery cell to be installed closer to other similar battery cells.

[0006] Preferably, the insulation film has at least one opening at an inlet or outlet of the cooling channel. This leaves the inlets and outlets required for cooling unobstructed.

[0007] In one embodiment, the insulation film has a plurality of openings at the inlet or outlet.

[0008] The insulation foil ends in a version before the inlet or the outlet.

[0009] The cooling plate preferably touches the cell casing. This type of mounting of the cooling plate, between the insulation foil and the cell casing, is very advantageous.

[0010] A particularly advantageous embodiment comprises a battery comprising two battery cells, each having a cooling plate with a wave geometry, wherein wave crests of one cooling plate are offset from the wave crests of the other cooling plate, in particular wherein wave crests of one cooling plate are at least partially arranged in wave troughs of the other cooling plate. This saves installation space.

[0011] In an advantageous embodiment of the battery, a compression layer is arranged between the battery cells between their insulation foils.

[0012] A method for producing the battery cell provides that a cooling plate having a cooling channel is arranged on a cell housing of the battery cell, wherein an electrically insulating insulation film is arranged around the battery cell, wherein the cooling plate is arranged within the insulation film, wherein the cooling channel is arranged outside the cell housing and wherein the cooling channel is open at least in sections towards the cell housing or the cooling channel is covered by a cooling plate between the insulation film and the cell housing or cooling channels are formed within the insulation film using spacers which the cell housing has and a cooling plate (108) placed thereon.

[0013] The method for producing the battery cell can provide that the cooling channel is arranged open towards the cell housing in first sections of the cooling plate, wherein the cooling plate is arranged adjacent to the cell housing in second sections in which no cooling channel is arranged, and wherein the cooling plate has a wave geometry with wave crests in the first sections and wave troughs in the second sections, wherein the wave crests in the first sections are arranged at a greater distance from the cell housing than the wave crests in the second sections.

[0014] A method for producing the battery provides that two battery cells according to one of the preceding claims are arranged in the battery, each having a cooling plate with a wave geometry, wherein wave crests of one cooling plate are arranged offset from the wave crests of the other cooling plate, in particular wherein wave crests of one cooling plate are arranged at least partially in wave troughs of the other cooling plate.

[0015] The method for producing the battery may provide for a compression layer to be arranged between the battery cells between their insulation foils.

[0016] Further advantageous embodiments can be found in the following description and the drawing. The drawing shows: Fig. 1 is a schematic representation of a first embodiment of a battery, Fig. 2 a schematic representation of a second embodiment of the battery Fig. 3 a method for manufacturing the battery.

[0017] In Fig. Figure 1 schematically shows a first embodiment of a battery 100. The battery 100 comprises a plurality of battery cells 102. The battery is, for example, a high-voltage battery.

[0018] The battery cells 102 each comprise a cell housing 104 surrounded by an electrically insulating foil 106. The battery cell 102 is, for example, a prismatic cell or a pouch cell for a high-voltage battery.

[0019] A cooling plate 108 is arranged within the insulation film 106, which includes a cooling channel 110. The cooling plate 108 preferably directly contacts the cell housing 104.

[0020] The cooling channel 110 is arranged outside the cell housing 104 and is open at least in sections towards the cell housing 104.

[0021] The cooling channel 110 is open toward the cell housing 104 in the first sections of the cooling plate 108. In the first sections, a coolant can directly contact the cell housing 104.

[0022] The cooling plate 108 rests against the cell housing 104 in second sections in which no cooling channel is arranged. The insulation film 106 has a Fig. 1, the inlet or outlet of the cooling channel 110 has at least one opening. The insulation film 106 has a plurality of openings, for example, at the inlet or outlet. The insulation film 106 ends, for example, before the inlet or outlet.

[0023] A spacer and / or compression layer 112 is arranged between the battery cells 102 and their insulation foils 106.

[0024] It can also be provided that the cell housing 104 comprises a cooling channel which is covered by a cooling plate 108 between the insulation film 106 and the cell housing.

[0025] It can also be provided that the cell housing 104 has spacers which, together with a cooling plate 108 placed thereon, form cooling channels 110 within the insulation film 106.

[0026] In Fig. 2, a second embodiment of the battery 100 is shown schematically. Elements of the battery 100 shown in Fig. 2 with the same reference symbol as in Fig. 1 are designed as described in the first embodiment.

[0027] In the second embodiment, the cooling plate 108 has a wave geometry, with wave crests in the first sections and wave troughs in the second sections, the wave crests in the first sections being spaced further from the cell housing 104 than the wave crests in the second sections.

[0028] The wave crests are spaced further from the cell housing 104 in the first sections than the wave crests in the second sections.

[0029] In the example, the battery 100 comprises three battery cells 102, each having two cooling plates 108 with a wave geometry, wherein wave crests of one cooling plate 108 are arranged offset from the wave crests of the other cooling plate 108.

[0030] In the example, the wave crests of one cooling plate 108 are at least partially arranged in wave troughs of the other cooling plate 108.

[0031] In Fig. 3 shows steps of a method for manufacturing a battery cell 102 and for manufacturing the battery 100.

[0032] The method for manufacturing the battery cell 102 includes a step 302.

[0033] In step 302, a cooling plate 108 having a cooling channel 110 is arranged on a cell housing 104 of the battery cell 102. The cooling channel 110 is open at least in sections toward the cell housing 104. The cooling plate 108 with the cooling channel 110 is arranged outside the cell housing 104.

[0034] The cooling channel 110 is arranged open toward the cell housing 104 in first sections of the cooling plate 108. The cooling plate 108 is arranged adjacent to the cell housing 104 in second sections of the cooling plate 108, in which no cooling channel is arranged.

[0035] To produce the battery cell or battery according to the second embodiment, the cooling plate 108 has a wave geometry, with wave crests in the first sections and wave troughs in the second sections, wherein the wave crests in the first sections are spaced further from the cell housing 104 than the wave crests in the second sections.

[0036] The method for manufacturing the battery cell 102 includes a step 304.

[0037] In step 304, an electrically insulating film 106 is arranged around the battery cell 102. The cooling plate 108 is arranged within the insulating film 106.

[0038] The method for manufacturing the battery cell 102 then ends.

[0039] It can also be provided that the cooling channel is covered by a cooling plate 108 between the insulation film 106 and the cell housing.

[0040] It can also be provided that cooling channels 110 are formed within the insulation film 106 using spacers provided on the cell housing 104 and a cooling plate 108 placed thereon.

[0041] The method for manufacturing battery 100 may include steps 302 and 304, or may be applied to previously manufactured battery cells 102. The method for manufacturing battery 100 includes a step 306.

[0042] In step 306, two battery cells 102 are arranged in the battery 100. A spacer and / or compression layer 112 is preferably arranged between the battery cells 102, preferably between their insulation foils 106.

[0043] To manufacture the battery 100 according to the second embodiment, two battery cells 102 are arranged, each having a cooling plate 108 with a wave geometry. Wave crests of one cooling plate 108 are offset from the wave crests of the other cooling plate 108. The wave crests of one cooling plate 108 are arranged, for example, at least partially in wave troughs of the other cooling plate 108. 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] WO 2015132786 A1

[0002]

Claims

[1] Battery cell (102), characterized by in that the battery cell (102) comprises a cell housing (104) which is surrounded by an electrically insulating insulation film (106), wherein a cooling plate (108) which comprises a cooling channel (110) is arranged within the insulation film (106), wherein the cooling channel (110) is arranged outside the cell housing (104) and is open at least in sections towards the cell housing (104), or the cell housing (104) comprises a cooling channel which is covered by a cooling plate (108) between the insulation film (106) and the cell housing, or the cell housing (104) has spacers which, with a cooling plate (108) placed thereon, form cooling channels (110) within the insulation film (106). [2] Battery cell (102) according to claim 1, characterized byin that the cooling channel (110) is open towards the cell housing (104) in first sections of the cooling plate (108), wherein the cooling plate (108) bears against the cell housing (104) in second sections in which no cooling channel is arranged, and wherein the cooling plate (108) has a wave geometry, with wave crests in the first sections and wave troughs in the second sections, wherein the wave crests in the first sections are spaced further from the cell housing (104) than the wave crests in the second sections. [3] Battery cell (102) according to one of claims 1 or 2, characterized by that the insulation film (106) has at least one opening at an inlet or outlet of the cooling channel (110). [4] Battery cell (102) according to claim 3, characterized by that the insulation film (106) has a plurality of openings at the inlet or outlet. [5] Battery cell (102) according to claim 4, characterized bythat the insulation foil (106) ends before the inlet or the outlet. [6] Battery cell (102) according to one of the preceding claims, characterized by that the cooling plate (108) touches the cell housing (104). [7] Battery (100), characterized by that the battery comprises two battery cells (102) according to one of the preceding claims, each having a cooling plate (108) with a wave geometry, wherein wave crests of one cooling plate (108) are arranged offset from the wave crests of the other cooling plate (108), in particular wherein wave crests of one cooling plate (108) are arranged at least partially in wave troughs of the other cooling plate (108). [8] Battery (100) according to claim 7, characterized by that a spacer and / or compression layer (112) is arranged between the battery cells (102) between their insulation films (106). [9] Method for producing a battery cell (102), characterized byin that a cooling plate (108) having a cooling channel (110) is arranged (302) on a cell housing (104) of the battery cell (102), wherein an electrically insulating insulation film (106) is arranged (304) around the battery cell (102), wherein the cooling plate (108) is arranged within the insulation film (106), wherein the cooling channel (110) is arranged outside the cell housing (104) and wherein the cooling channel (110) is open at least in sections towards the cell housing (104) or the cooling channel is covered by a cooling plate (108) between the insulation film (106) and the cell housing or cooling channels (110) are formed with spacers which the cell housing (104) has and with a cooling plate (108) placed thereon within the insulation film (106). [10] Method according to claim 9, characterized byin that the cooling channel (110) is arranged open towards the cell housing (104) in first sections of the cooling plate (108), wherein the cooling plate (108) is arranged adjacent to the cell housing in second sections in which no cooling channel is arranged, and wherein the cooling plate (108) has a wave geometry, with wave crests in the first sections and wave troughs in the second sections, wherein the wave crests in the first sections are arranged at a greater distance from the cell housing (104) than the wave crests in the second sections. [11] Method for producing a battery (100), characterized bythat two battery cells (102) according to one of the preceding claims 1 to 6 are arranged (306) in the battery (100), in particular two battery cells (102), each having a cooling plate (108) with a wave geometry, wherein wave crests of one cooling plate (108) are arranged offset from the wave crests of the other cooling plate (108), in particular wherein wave crests of one cooling plate (108) are arranged at least partially in wave troughs of the other cooling plate (108). [12] Method according to claim 11, characterized by that a spacer and / or compression layer (112) is arranged (306) between the battery cells (102) between their insulation films (106).

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