Battery cell assemblies

Abstract

Battery cell assemblies are provided, comprising first and second battery cells and battery cartridge including a plate with first plate side and a second plate side. The first plate side includes a first channelling for DLC of first battery cell and a first perimetral frame through which the first battery cell is mechanically connected with the first plate side so that the first battery cell is cooled by coolant liquid flowing in direct contact therewith across the first channelling. The second plate side includes a second channelling for DLC of second battery cell and a second perimetral frame through which the second battery cell is mechanically connected with the second plate side so that the second battery cell is cooled by coolant liquid flowing in direct contact therewith across the second channelling. Battery modules including several battery cell assemblies of said type are also provided.

Description

[0001] BATTERY CELL ASSEMBLIES

[0002] This application claims the benefit of European Patent Application EP23382774.0 filed 25 July 2023.

[0003] The present disclosure relates to a battery cell assembly and to a battery module formed by one or more battery cell assemblies of said type.

[0004] BACKGROUND

[0005] Performance of a battery cell or a battery cell assembly or module depends on keeping it in an optimal temperature range, to prevent it from getting too hot during battery operation, i.e. , when battery is powering a device or system or when it is being recharged. Battery performance may be also affected by the environmental temperature conditions surrounding the battery. Battery cooling appears to be a crucial aspect from performance, aging and safety perspective.

[0006] Different manners and technologies are known to control temperature of a battery cell or a battery cell assembly or module. Examples of refrigeration by means of a coolant liquid are indirect liquid cooling and direct liquid cooling. Indirect liquid cooling is based on a pipe or pipes close to or adjacent to battery cells and a coolant liquid circulating through said pipe or pipes. Direct liquid cooling is based on a coolant liquid, different from that used in indirect refrigeration, which is or flows in direct contact with battery cells (instead of circulating through pipe or pipes). Direct liquid cooling has been proved to be more efficient than indirect cooling.

[0007] A type of direct liquid cooling is immersion cooling in which the battery cells themselves are directly submerged in a coolant liquid, thereby allowing direct contact by the coolant liquid with the heat source at battery side. The coolant liquid may be a dielectric liquid with non-conductive electrical properties. Although immersion cooling has revealed good results, it is understood that battery cooling is still improvable, even to large extent.

[0008] An object of the disclosure is to provide new manners or techniques of battery cooling improving current battery cooling approaches.

[0009] SUMMARY

[0010] In an aspect, a battery cell assembly is provided, comprising a battery cartridge, a first battery cell and a second battery cell, the battery cartridge comprising a plate having a first plate side and a second plate side opposite to the first plate side. The first plate side includes a first channelling for direct liquid cooling of the first battery cell and a first perimetral frame surrounding the first channelling to provide, in use, mechanical connectivity with the first battery cell and mechanical rigidity to the battery cell assembly. The second plate side includes a second channelling for direct liquid cooling of the second battery cell and a second perimetral frame surrounding the second channelling to provide, in use, mechanical connectivity with the second battery cell and mechanical rigidity to the battery cell assembly. The first battery cell is adjacent to or mechanically connected with the first plate side of the battery cartridge in such a manner that, in use, the first battery cell is cooled by coolant liquid flowing through the first channelling in direct contact with the first battery cell. The second battery cell is adjacent to or mechanically connected with the second plate side of the battery cartridge in such a manner that, in use, the second battery cell is cooled by coolant liquid flowing through the second channelling in direct contact with the second battery cell.

[0011] Battery cooling refers to regulate the temperature of battery cells forming a battery pack, by cooling or heating the cells depending on what is required in each situation. Direct liquid cooling refers to that said regulation is performed through a coolant liquid in direct contact with the battery or cells forming the battery. The coolant liquid may be a dielectric liquid to ensure electrical insulation and to avoid short circuits.

[0012] The term “cooling” used thorough the present disclosure may be thus understood as referring to the more general concept of temperature or thermal control or management of battery cells or battery packs formed by battery cells.

[0013] The proposed battery cartridge (in the battery cell assembly) provides first channelling (at one side of its plate) and second channelling (at opposite side of its plate) and, therefore, independent from one another. First battery cell arranged (or arrangeable) adjacent to first channelling is cooled by coolant liquid flowing through first channelling, independently from second battery cell which is arranged (or arrangeable) adjacent to second channelling and cooled by coolant liquid flowing through second channelling. Each of the perimetral frames (at one and opposite side of the battery cartridge) provide mechanical connectivity with adjacent battery cell and mechanical rigidity to whole battery cell assembly. These features synergistically cooperate to form more compact battery cell assemblies easily and, in turn, with adequate rigidity and cooling properties. Indeed, such battery cartridges provide the aforementioned improved compacity when forming battery assemblies or modules while keeping, in turn, same or similar gravimetric and volumetric density properties as those of prior art approaches aimed at cooling battery cells. In battery cell assemblies of example, the battery cartridge may be a monolithic piece with the first and second perimetral frames and the first and second channellings implemented in relief based on protruding and recessed parts. Each of the perimetral frames may be formed with protruding and recessed parts to mechanically mat or connect with corresponding adjacent battery cell. Each of the channellings may be formed with protruding and recessed parts forming channels making up corresponding channelling. This monolithic approach may provide suitable mechanical rigidity and robustness properties.

[0014] In some configurations, the first plate side may be sized to cover whole face of the first battery cell through which it is adjacent to or mechanically connected with the first plate side, and the second plate side may be sized to cover whole face of the second battery cell through which it is adjacent to or mechanically connected with the second plate side. This sizing of first and second plate sides may provide optimum cooling of corresponding adjacent battery cell and adequate mechanical rigidity and robustness to whole assembly.

[0015] According to implementations, a first gasket may be mounted surrounding the first channelling to prevent, in use, leakage of coolant liquid from the first channelling and, similarly, second gasket may be mounted surrounding the second channelling to prevent, in use, leakage of coolant liquid from the second channelling. This gasket-based approach may provide proper tightness properties to whole assembly.

[0016] First channelling and second channelling may have same or similar channel arrangement or distribution. Alternatively, first channelling and second channelling may be different from each other depending on each battery cell to be arranged adjacent to each of the first and second channellings. In fact, channellings at one side and the other side of the battery cartridge may be customized or customizable to the one and the other battery cell to be cooled. This possibility of customizing each of the channellings is a remarkable advantage of the proposed battery cartridge since it defines separate channellings at one and other side thereof, i.e. , independent from one another.

[0017] In examples, channels forming each of the first and second channellings may be II- shaped or inverted U-shaped channels. In particular, said U-shaped or inverted U-shaped channels may be nested U-shaped or inverted U-shaped channels. This property may permit an optimum or extensive contact by coolant liquid with corresponding battery cell to be cooled.

[0018] In some implementations, a single inlet may be included for each of the (first and second) channellings to simultaneously feed all channels forming the channelling with coolant liquid. Similarly, a single outlet may be included for each of the (first and second) channellings to simultaneously evacuate coolant liquid from all channels forming the channelling. This unique inlet and outlet approach may provide uniform and effective cooling of respective battery cells. Flow control system (which may be included in the battery cell assembly) may exert more or less pressure to coolant liquid to cause its inflow to and outflow from all channels forming corresponding channelling in very balanced manner. This balanced flow of the coolant liquid may effectively cause a very uniform cooling of corresponding battery cell. In alternative configurations, each of the (first and second) channellings may have more than one inlet and / or more than one outlet.

[0019] According to some examples, a battery module may be provided including a series of battery cell assemblies such as the aforementioned ones. In such a battery module, one battery cell assembly may be mechanically connected with next battery cell assembly in the series through a mechanical connector. The battery module therefore has a first final battery cell at one end of the module and a second final battery cell at opposite end of the module.

[0020] One or more of the mechanical connectors in the battery module may be each a battery cartridge such as the aforementioned ones and / or a mechanical absorber to enable swelling of battery cells in the battery module. The mechanical absorber may be made of any known Thermal Runaway preventing material.

[0021] In some configurations, the battery module may further comprise a first protector plate adjacent to the first final battery cell and a second protector plate adjacent to the second final battery cell. Each of the first and second protector plates may include a cooling side through which the protector plate is arranged adjacent to or mechanically connected with corresponding final battery cell, said cooling side including a channelling to cool the final battery cell by coolant liquid flowing through said channelling.

[0022] The battery module may further comprise a pressing mechanism to maintain elements conforming the battery module pressed to or with each other. Such a pressing mechanism may comprise one or more studs and one or more fasteners for each of the studs. Each of the studs may be configured to extend internally to the battery module from one end to the opposite end of the battery module, and the one or more fasteners may be configured to be fastened at one end or both ends of the stud.

[0023] BRIEF DESCRIPTION OF THE DRAWINGS Non-limiting examples of the disclosure will be described in the following, with reference to the appended drawings, in which:

[0024] Figure 1 is a schematic illustration of a battery cartridge for a battery cell assembly according to examples, along with first and second protector plates to complete the battery cell assembly.

[0025] Figure 2 is a schematic illustration of a battery cell assembly according to examples, including battery cartridge and first and second protector plates such as the ones of Figure 1.

[0026] Figure 3 is a schematic illustration of a channelling and battery cell adjacent to said channelling, such as the ones of Figures 1 and 2, further including a gasket surrounding the channelling to prevent leakage of coolant liquid from it.

[0027] Figure 4 is a schematic illustration of same or similar battery cell assembly or module as the one of Figure 2 from a point of view that allows to see single inlet to and single outlet from each of the channellings in the battery cell assembly or module.

[0028] Figure 5 illustrates a schematic exploded view of battery cartridge or protector plate with channelling, liquid dispersers and gasket, battery cell and mechanical absorber assembled or assemble able one another.

[0029] Figure 6 is a schematic illustration of a portion in battery cartridge or protector plate showing conduct element couplable with conduct element of another battery cartridge or protector plate to form main inlet conduct or main outlet conduct.

[0030] Figure 7 is a schematic illustration of main inlet conduct or main outlet conduct formed by conduct element in battery cartridge or protector plate coupled with conduct element in another battery cartridge or protector plate.

[0031] Figure 8 is a schematic illustration of a battery module formed by two or more assemblies such as the ones of Figure 2.

[0032] DETAILED DESCRIPTION OF EXAMPLES

[0033] Figure 1 is a schematic illustration of a battery cartridge 100 for a battery cell assembly according to examples, along with first and second protector plates 101 , 102 also for the battery cell assembly. First protector plate 101 may include channelling 103 for direct liquid cooling of battery cell adjacent thereto and perimetral frame 104 to provide mechanical connectivity with adjacent battery cell and mechanical rigidity to whole battery cell assembly to be formed. Second protector plate 102 may include channelling 105 for direct liquid cooling of battery cell adjacent thereto and perimetral frame 106 to provide mechanical connectivity with adjacent battery cell and mechanical rigidity to whole battery cell assembly to be formed.

[0034] Battery cartridge 100 may comprise a plate with first plate side 107 and second plate side 108. First plate side 107 may include first channelling (which may be equal or similar to channellings 103, 105) for direct liquid cooling of a first battery cell and a first perimetral frame (that may be equal or similar to frames 104, 106) surrounding said first channelling to provide mechanical connectivity with first battery cell and mechanical rigidity to whole battery cell assembly to be mounted. Second plate side 108 may include second channelling (which may be equal or similar to channellings 103, 105) for direct liquid cooling of a second battery cell and a second perimetral frame (that may be equal or similar to frames 104, 106) surrounding said second channelling to provide mechanical connectivity with second battery cell and mechanical rigidity to whole battery cell assembly to be mounted.

[0035] Battery cartridge 100 may further comprise at both first plate side 107 and second plate side 108 liquid dispersers 109 to cause same or similar amount of coolant liquid to flow through each of the channels forming the channellings irrespective of each channel’s length. Same or similar liquid dispersers 109 may also be included in channellings of the protector plates 101 , 102.

[0036] As illustrated, perimetral frames 104, 106 in both battery cartridge 100 and protector plates 101 , 102 may include holes configured to implement a stud-based or screwed or bolted connection or coupling of elements forming the battery cell assembly to be mounted. Said connection or coupling may implement a pressing mechanism to keep elements forming the battery cell assembly or battery module pressed to each other. Such a pressing mechanism may comprise one or more studs and one or more fasteners (e.g., bolts or screws) for each of the studs, which may extend internally to the battery module from one end to the opposite end of the battery module through aforementioned holes in frames 104, 106 of the battery cartridge 100 and protector plates 101 , 102.

[0037] As shown in Figure 1 , channels forming the channellings 103, 107, 108, 105 may be II- shaped or inverted U-shaped channels which may preferably be nested U-shaped channels or nested inverted U-shaped channels. In alternative implementations, such channels may have any other shape different from U-shape whenever most or large or sufficient surface of battery cell’s face is covered by coolant liquid flowing through the channels. In any case, whatever channels' shape, liquid dispersers 109 may contribute to make same or similar amount of coolant liquid to flow through each of the channels in same channelling 103, 107, 108, 105.

[0038] Battery cartridge 100 may be formed as a single monolithic piece, as described in other parts of the present disclosure. First and second plate sides 107, 108 may be sized to cover whole adjacent surface of corresponding battery cell to maximize cooling performance. First and second plate sides 107, 108 may have square shape for prismatization purposes, i.e., to form battery cell assemblies or modules with prismatic shaped battery cells.

[0039] As explained in other parts of the disclosure, channellings 103, 107, 108, 105 in battery cartridge 100 and / or protector plates 101 , 102 may have same or similar channel arrangement or distribution. Alternatively, channellings 103, 107, 108, 105 may be different and / or customizable depending on battery cell to be cooled in each case.

[0040] Figure 2 is a schematic illustration of a battery cell assembly or battery module according to examples, including battery cartridge 100 and first and second protector plates 101 , 102 such as the ones of Figure 1. As shown in the illustration, the battery cell assembly or battery module may include a battery cartridge 100, first battery cell 202, second battery cell 203, third battery cell 200, fourth battery cell 205, one mechanical absorber 201 , another mechanical absorber 204, and first and second protector plates 101 , 102. Battery cells 200, 202, 203, 205 may be pouch type battery cells which may thus experience swelling.

[0041] Battery cartridge 100 may be sandwiched between first and second battery cells 202, 203, mechanical absorber 201 may be sandwiched between first and third battery cells 202, 200, and mechanical absorber 204 may be sandwiched between second and fourth battery cells 203, 205. First protector plate 101 may be arranged in battery cell assembly in such a manner that (dielectric) liquid flowing throw channelling 103 of first protector plate 101 cools third battery cell 200. Second protector plate 102 may be arranged in battery cell assembly in such a manner that (dielectric) liquid flowing throw channelling 105 of second protector plate 102 cools fourth battery cell 102.

[0042] Third battery cell 200 may be directly cooled at one side thereof by coolant liquid flowing through channelling 103 of the first protector plate 101 and mechanical variations (due to, e.g., swelling) may be mechanically absorbed by mechanical absorber 201 at the other side of the third battery cell 200. First battery cell 202 may be directly cooled at one side thereof by coolant liquid flowing through channelling 107 of the battery cartridge 100 and mechanical variations (due to, e.g., swelling) may be mechanically absorbed by mechanical absorber 201 at the other side of the first battery cell 202.

[0043] Fourth battery cell 205 may be directly cooled at one side thereof by coolant liquid flowing through channelling 105 of the second protector plate 102 and mechanical variations (due to, e.g., swelling) may be mechanically absorbed by mechanical absorber 204 at the other side of the fourth battery cell 205. Second battery cell 203 may be directly cooled at one side thereof by coolant liquid flowing through channelling 108 of the battery cartridge 100 and mechanical variations (due to, e.g., swelling) may be mechanically absorbed by mechanical absorber 204 at the other side of the second battery cell 203.

[0044] Mechanical absorbers 201 , 204 may be made of Thermal Runaway preventing material to help to prevent or attenuate extreme conditions in case that heat generated within battery assembly or module exceeds the amount of heat that is dissipated to its surroundings.

[0045] Configurations according to Figure 2 thus permit having each of the battery cells 200, 202, 203, 205 forming the battery assembly or module cooled at one side thereof and with mechanical absorption at the other side thereof. It is not shown in the drawing, but all the elements conforming the battery assembly or module 101 , 200 - 205, 102 may be pressed to / with each other by means of a pressing mechanism such as the ones described in other parts of the disclosure.

[0046] Figure 3 is a schematic illustration of a channelling 103, 105, 107, 108 and battery cell 200, 202, 203, 205 to be arranged adjacent to said channelling, such as the ones of Figures 1 and 2, further including a gasket 300 surrounding the channelling to prevent leakage of coolant liquid from it. In this illustration, gasket 300 is shown twice for reasons of completeness. As shown in left drawing of the figure, gasket may be mounted or attached or coupled to perimetral region surrounding the channelling 103, 105, 107, 108 or, as shown in right drawing of the figure, to battery cell 200, 202, 203, 205 in such a manner that when it is arranged adjacent to channelling 103, 105, 107, 108, gasket 300 surrounds the channelling 103, 105, 107, 108 in same manner as shown in left drawing. Sealing and liquid leakage avoidance is improved with this gasket approach.

[0047] Figure 4 is a schematic illustration of same or similar battery cell assembly or module as the one of Figure 2 from a point of view that allows to see single inlet 402 - 405 to and single outlet 406 - 409 from each of the channellings 103, 107, 108, 105 in the battery cell assembly or module. Battery cell 200 is shown arranged to be cooled by coolant liquid flowing through channelling 103 and enabled to fatten (due to, e.g., swelling) thanks to mechanical absorber 201 . Battery cell 202 is shown arranged to be cooled by coolant liquid flowing through channelling 107 and enabled to fatten (due to, e.g., swelling) thanks to mechanical absorber 201. Battery cell 205 is shown arranged to be cooled by coolant liquid flowing through channelling 105 and enabled to fatten (due to, e.g., swelling) thanks to mechanical absorber 204. Battery cell 203 is shown arranged to be cooled by coolant liquid flowing through channelling 108 and enabled to fatten (due to, e.g., swelling) thanks to mechanical absorber 204.

[0048] Main inlet conduct 401 may simultaneously feed with coolant liquid all channels forming the channelling 103 through inlet 402, all channels forming the channelling 107 through inlet 403, all channels forming the channelling 108 through inlet 404, and all channels forming the channelling 105 through inlet 405. Main outlet conduct 400 may simultaneously evacuate coolant liquid from all channels forming the channelling 103 through outlet 406, all channels forming the channelling 107 through outlet 407, all channels forming the channelling 108 through outlet 408, and all channels forming the channelling 105 through outlet 409.

[0049] Flow control system, which may be external or internal to the battery cell assembly or module, may exert certain pressure to coolant liquid for it to flow through main inlet conduct 401 towards inlets 402 - 405 to make the coolant liquid to flow through channellings 103, 107, 108, 105, respectively. Pressure may be higher or lower depending on specs of the battery cells to be cooled and its intended operation. For example, pressure may be higher if it is required the coolant liquid to flow faster through channellings 103, 107, 108, 105, or lower if it is needed the coolant liquid to flow more slowly through channellings 103, 107, 108, 105. Once coolant liquid has passed through channellings 103, 107, 108, 105 from beginning to end, it is evacuated through outlets 406 - 409, respectively.

[0050] Figure 5 illustrates a schematic exploded view of battery cartridge or protector plate 101 , 100, 102 with channelling 103, 105, 107, 108, liquid dispersers 109 and gasket 300; battery cell 200, 202, 203, 205; and mechanical absorber 201 , 204; said three components, which may be equal or similar to the ones of Figures 1 and 2, being assembled or assemble able one another. It is further shown in this drawing that battery cartridge or protector plate 101 , 100, 102 may include a conduct element 500 couplable with conduct element 500 of another battery cartridge or protector plate 101 , 100, 102 to form main inlet conduct 401 or main outlet conduct 400.

[0051] Figure 6 is a schematic more detailed illustration of a conduct element 500 in battery cartridge or protector plate 101 , 100, 102 couplable with conduct element 500 of another battery cartridge or protector plate 101 , 100, 102 to form main inlet conduct 401 or main outlet conduct 400. As shown, conduct element 500 may include a male conduct part 600 fittable into female conduct part of another battery cartridge or protector plate 101 , 100, 102 to form main conduct 400, 401. A gasket 601 may be mounted in / on / around male conduct part 600 to prevent liquid leakage from main conduct 400, 401 at the coupling of male conduct part 600 with female conduct part of the other battery cartridge or protector plate 101 , 100, 102.

[0052] Figure 7 is a schematic illustration of main inlet conduct 401 or main outlet conduct 400 formed by conduct element 500 in battery cartridge or protector plate 101 , 100, 102 coupled (through, e.g., male-female connection) with conduct element 500 in another battery cartridge or protector plate 101 , 100, 102. As shown in the drawing, corresponding gaskets 601 may be installed or mounted in / on / at such couplings to prevent coolant liquid to leak from main inlet conduct 401 or main outlet conduct 400.

[0053] Figure 8 is a schematic illustration of a battery module formed by two or more assemblies such as the ones of Figure 2. It is shown that battery modules may be formed with different components described in present disclosure. Assemblies equal or similar to the ones of Figure 2 may be used to form battery modules as large as desired / wanted. Protector plates 101 , 102 may be arranged at respective ends of the battery module with one or more assemblies formed by battery cells 200, 202, 203, 205, mechanical protectors 201 , 204 and battery cartridge 100 coupled with each other as shown in the drawing. Several of such assemblies 200 - 202, 100, 203 - 205 may be coupled to each other with corresponding battery cartridge 800 interfacing between them.

[0054] Battery cartridges 100 disclosed herein may be very useful to form very large and compact battery modules according to principles and features described in present disclosure. Since proposed battery cartridges 100 have one coolant channelling at one side 107 and another coolant channelling at opposite side 108, said channellings 107, 108 share same wall or barrier between adjacent battery cells at one side and opposite side of the battery cartridge 100. This aspect permits forming more compact battery modules in comparison to prior art modules of same or similar type, while keeping proper cooling properties and, in examples including mechanical absorber(s) 201 , 204, significant enablement of swelling.

[0055] Although only a number of examples have been disclosed herein, other alternatives, modifications, uses and / or equivalents thereof are possible. Furthermore, all possible combinations of the described examples are also covered. Thus, the scope of the disclosure should not be limited by particular examples, but it should be determined only by a fair reading of the claims that follow.

Claims

CLAIMS1 . Battery cell assembly including a battery cartridge, a first battery cell and a second battery cell, the battery cartridge comprising a plate having first plate side and second plate side; wherein the first plate side includes a first channelling for direct liquid cooling of the first battery cell and a first perimetral frame surrounding the first channelling to provide, in use, mechanical connectivity with the first battery cell and mechanical rigidity to the battery cell assembly; the second plate side, opposite to the first plate side, includes a second channelling for direct liquid cooling of the second battery cell and a second perimetral frame surrounding the second channelling to provide, in use, mechanical connectivity with the second battery cell and mechanical rigidity to the battery cell assembly; the first battery cell is adjacent to or mechanically connected with the first plate side of the battery cartridge in such a manner that, in use, the first battery cell is cooled by coolant liquid flowing through the first channelling in direct contact with the first battery cell; and wherein the second battery cell is adjacent to or mechanically connected with the second plate side of the battery cartridge in such a manner that, in use, the second battery cell is cooled by coolant liquid flowing through the second channelling in direct contact with the second battery cell.

2. Battery cell assembly according to claim 1 , wherein the battery cartridge is a monolithic piece with the first and second perimetral frames and the first and second channellings implemented in relief based on protruding and recessed parts.

3. Battery cell assembly according to any of claims 1 or 2, wherein the first plate side is sized to cover whole face of the first battery cell through which it is adjacent to or mechanically connected with the first plate side, and the second plate side is sized to cover whole face of the second battery cell through which it is adjacent to or mechanically connected with the second plate side.

4. Battery cell assembly according to any of claims 1 to 3, further including a first gasket mounted surrounding the first channelling to prevent, in use, leakage of coolant liquid from the first channelling, and a second gasket mounted surrounding the second channelling to prevent, in use, leakage of coolant liquid from the second channelling.

5. Battery cell assembly according to any of claims 1 to 4, wherein the first channelling and second channelling have same or similar channel arrangement or distribution.

6. Battery cell assembly according to any of claims 1 to 5, wherein channels forming each of the first and second channellings are U-shaped or inverted U-shaped channels, preferably nested U-shaped or inverted U-shaped channels.

7. Battery cell assembly according to any of claims 1 to 6, including a single inlet for each of the first and second channellings to simultaneously feed channels forming the channelling with coolant liquid, and a single outlet for each of the first and second channellings to simultaneously evacuate coolant liquid from channels forming the channelling.

8. Battery cell assembly according to any of claims 1 to 7, wherein each of the first and second battery cells is a pouch type battery cell.

9. Battery module including a series of battery cell assemblies according to any of claims 1 to 8, wherein one battery cell assembly is mechanically connected with next battery cell assembly in the series through a mechanical connector, the battery module therefore having a first final battery cell at one end and a second final battery cell at opposite end of the battery module.

10. Battery module according to claim 9, wherein one or more of the mechanical connectors are each a battery cartridge with same configuration as the one included in each of the battery cell assemblies forming the battery module.

11. Battery module according to any of claims 9 or 10, wherein one or more of the mechanical connectors are each a mechanical absorber to enable swelling of battery cells in the battery module.

12. Battery module according to claim 11 , wherein the mechanical absorber is made of Thermal Runaway preventing material.

13. Battery module according to any of claims 9 to 12, further comprising a first protector plate adjacent to the first final battery cell and a second protector plate adjacent to the second final battery cell; wherein each of the first and second protector plates includes a cooling side through which the protector plate is adjacent to or mechanically connected with corresponding finalbattery cell, said cooling side including a channelling to cool the final battery cell by coolant liquid flowing through the channelling.

14. Battery module according to any of claims 9 to 13, further comprising a pressing mechanism to maintain elements forming the battery module pressed to each other, the pressing mechanism comprising one or more studs and one or more fasteners for each of the studs; wherein each of the studs is configured to extend internally to the battery module from one end to the opposite end of the battery module, and the one or more fasteners are configured to be fastened at one end or both ends of the stud.

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