Battery cell, battery cell group and vehicle

Abstract

The utility model discloses a battery cell, a battery cell group and a vehicle, the battery cell comprises a shell and a runner plate, the runner plate is connected with the shell and is located outside the shell, a cooling runner is defined between the runner plate and the shell, and the runner plate is provided with a first water passing port and a second water passing port which are communicated with the cooling runner. The battery cell provided by the utility model has the advantages of high heat exchange efficiency with the cooling liquid and high integration level of the cooling system.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a battery cell, a battery cell group and a vehicle. Background Art

[0002] In the related art, the liquid cooling system used for cooling the battery cells is a liquid cooling plate in contact with the large surface of the battery cell, or a liquid cooling plate in contact with the bottom and side of the battery cell. The liquid cooling plate is generally composed of a flow channel plate and a support plate welded together. A thermally conductive structural adhesive needs to be applied between the liquid cooling plate and the battery cell to provide structural support and improve cooling efficiency. However, this cooling system has the problems of low heat exchange efficiency between the coolant and the battery cell and low integration of the cooling system. Utility Model Content

[0003] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0004] To this end, an embodiment of the present application proposes a battery cell, which has the advantages of high heat exchange efficiency with the coolant and high integration of the cooling system.

[0005] The embodiments of the present application also provide a battery cell pack.

[0006] An embodiment of the present application further provides a vehicle.

[0007] The battery cell of the embodiment of the present application includes a shell and a flow channel plate, the flow channel plate is connected to the shell and is located outside the shell, a cooling flow channel is defined between the flow channel plate and the shell, and the flow channel plate is provided with a first water outlet and a second water outlet connected to the cooling flow channel.

[0008] According to the battery cell of the embodiment of the present application, the flow channel plate is connected to the shell, and a cooling flow channel is defined between the flow channel plate and the shell. At this time, the coolant can circulate in the cooling flow channel through the first water outlet and the second water outlet on the flow channel plate. Among them, the coolant is in direct heat exchange contact with the shell of the battery cell, instead of indirectly exchanging heat with the shell through a thermally conductive structural adhesive and a support plate as in the related art, thereby making the heat exchange efficiency between the coolant and the shell high and the heat dissipation effect on the battery cell good. Moreover, there is no need to set a thermally conductive structural adhesive and a support plate between the shell and the flow channel plate, which not only improves the integration of the cooling system on the battery cell, but also makes the battery cell lighter and less expensive while having a cooling function.

[0009] In some embodiments, the housing includes a first end plate and a second end plate that are opposite to each other in a first direction, and at least one of the first end plate and the second end plate is provided with a pole;

[0010] The shell further includes a peripheral wall connecting the first end plate and the second end plate, the flow channel plate is connected to the peripheral wall, and the cooling flow channel is defined between the flow channel plate and the peripheral wall.

[0011] In some embodiments, the peripheral wall includes a first side wall and a second side wall opposite to each other along a second direction, and includes a third side wall and a fourth side wall opposite to each other along a third direction, and the second direction, the third direction and the first direction are perpendicular to each other, wherein:

[0012] The flow channel plate is provided with a flow channel groove, and the cooling flow channel is defined between the flow channel groove and the outer surface of each of the first side wall and the third side wall;

[0013] Alternatively, the flow channel plate is provided with a flow channel groove, and the flow channel groove and the outer surface of each of the first side wall, the second side wall, the third side wall and the fourth side wall define the cooling flow channel.

[0014] In some embodiments, a portion of the flow channel plate is connected to the peripheral wall, and the remaining portion of the flow channel plate is bent in a direction away from the peripheral wall to form a boss, the boss defines a flow channel groove opposite to the outer surface of the peripheral wall, and the cooling flow channel is defined between the flow channel groove and the outer surface of the peripheral wall.

[0015] In some embodiments, the portion of the flow channel plate that forms the flow channel groove includes a plurality of first segments and a plurality of second segments alternately arranged along a first direction, any adjacent first segments and second segments are interconnected, an extension direction of the first segment is perpendicular to the first direction, and an extension direction of the second segment is consistent with the first direction.

[0016] In some embodiments, the distance between any two adjacent first sections is D1, the distance between the first section adjacent to the first end plate and the outer surface of the first end plate is D2, and the distance between the first section adjacent to the second end plate and the outer surface of the second end plate is D3, wherein D1≥8mm, D2≥8mm, and D3≥8mm.

[0017] In some embodiments, the depth of the flow channel groove is H, the width of the flow channel groove is W, and the thickness at any position in the flow channel plate is T, wherein 2mm≤H≤4mm, W≤28mm, and 1mm≤T≤1.5mm.

[0018] In some embodiments, the cooling channel has a first end and a second end opposite to the first direction, and the first water outlet and the second water outlet are respectively disposed at the first end and the second end of the cooling channel;

[0019] The battery cell further includes a first water nozzle and a second water nozzle, wherein the first water nozzle is connected to the first water outlet, and the second water nozzle is connected to the second water outlet.

[0020] The battery cell group according to the embodiment of the present application includes a plurality of battery cells as described in any of the above embodiments, the plurality of battery cells are arranged in sequence along the second direction, and any two adjacent battery cells are bonded by thermally conductive adhesive.

[0021] According to the battery cell group of the embodiment of the present application, by adopting the battery cells of the above embodiment, it has the advantages of high heat exchange efficiency with the coolant and high integration of the cooling system. In addition, two adjacent battery cells are connected by heat transfer through thermal conductive glue, and no heat insulation pad is required between the two, which effectively improves the space utilization of the battery cell group.

[0022] The vehicle according to the embodiment of the present application includes the battery cell group as described in the above embodiment.

[0023] The technical advantages of the vehicle according to the embodiment of the present application are the same as the technical advantages of the battery pack of the above-mentioned embodiment, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of a battery cell according to an embodiment of the present application.

[0025] Figure 2 yes Figure 1 Exploded diagram.

[0026] Figure 3 is another schematic diagram of a battery cell according to an embodiment of the present application.

[0027] Figure 4 yes Figure 3 Exploded diagram.

[0028] Figure 5 yes Figure 3 sectional view of .

[0029] Figure 6 Schematic diagram of a battery pack according to an embodiment of the present application.

[0030] Figure 7 yes Figure 6 Front view of .

[0031] Figure 8 is a front view of another battery cell group according to an embodiment of the present application.

[0032] Reference numerals:

[0033] 1. Shell; 11. First end plate; 12. Pole; 13. First side wall; 14. Third side wall; 2. Flow channel plate; 21. First section; 22. Second section; 23. Cooling flow channel; 231. Flow channel groove; 24. First water outlet; 25. Second water outlet; 3. First water nozzle; 4. Second water nozzle. DETAILED DESCRIPTION

[0034] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, but cannot be understood as limiting the present application.

[0035] Combine the following Figure 1-Figure 8 A battery cell according to an embodiment of the present application is described.

[0036] The battery cell of the embodiment of the present application includes a shell 1 and a flow channel plate 2, the flow channel plate 2 is connected to the shell 1 and is located outside the shell 1, a cooling flow channel 23 is defined between the flow channel plate 2 and the shell 1, and the flow channel plate 2 is provided with a first water outlet 24 and a second water outlet 25 that are connected to the cooling flow channel 23.

[0037] According to the battery cell of the embodiment of the present application, the flow channel plate 2 is connected to the shell 1, and a cooling channel 23 is defined between the flow channel plate 2 and the shell 1. At this time, the coolant can circulate in the cooling channel 23 through the first water outlet 24 and the second water outlet 25 on the flow channel plate 2. Among them, the coolant directly exchanges heat with the shell 1 of the battery cell, instead of indirectly exchanging heat with the shell through a thermally conductive structural adhesive and a support plate as in the related art, thereby making the heat exchange efficiency between the coolant and the shell 1 high and the heat dissipation effect on the battery cell good. Moreover, there is no need to set a thermally conductive structural adhesive and a support plate between the shell 1 and the flow channel plate 2, which not only improves the integration of the cooling system on the battery cell, but also makes the battery cell lighter and less expensive while having a cooling function.

[0038] For ease of understanding, Figure 1 The arrow X in the middle indicates the third direction of the battery cell according to the embodiment of the present application. Figure 1 The middle arrow Y indicates the second direction of the battery cell according to the embodiment of the present application. Figure 1 The middle arrow Z indicates the first direction of the battery cell according to an embodiment of the present application.

[0039] In some embodiments, Figure 1-Figure 4 As shown, the housing 1 includes a first end plate 11 and a second end plate opposite to each other in a first direction, and at least one of the first end plate 11 and the second end plate is provided with a pole 12. The housing 1 also includes a peripheral wall connecting the first end plate 11 and the second end plate, the flow channel plate 2 is connected to the peripheral wall, and a cooling flow channel 23 is defined between the flow channel plate 2 and the peripheral wall.

[0040] The outer surface area of ​​the peripheral wall is larger than that of the first end plate 11 and the second end plate. When the flow channel plate 2 is connected to the peripheral wall, it is not interfered by the pole 12 on the battery cell. The connection difficulty between the flow channel plate 2 and the peripheral wall is lower. It is easier to define a cooling channel 23 with a larger distribution area between the flow channel plate 2 and the peripheral wall, so that the coolant in the cooling channel 23 can better cool the battery cell. Moreover, the connection between the flow channel plate 2 and the peripheral wall will not block the pole 12 and the explosion-proof valve, effectively ensuring the convenience and reliability of the battery cell.

[0041] Specifically, Figure 1-Figure 4 As shown, two poles 12 are arranged on the first end plate 11, and an explosion-proof valve is also arranged on the first end plate 11.

[0042] It should be noted that the flow channel plate 2 is connected to the peripheral wall by any connection direction of brazing, laser welding and gluing. After the flow channel plate 2 is connected to the peripheral wall, an insulating layer is sprayed on the outer surface of the housing 1 and the flow channel plate 2 to ensure the reliability and safety of the battery cell.

[0043] In some embodiments, Figure 2 and Figure 4 As shown, the peripheral wall includes a first side wall 13 and a second side wall opposite to each other in the second direction, and includes a third side wall 14 and a fourth side wall opposite to each other in the third direction. The second direction, the third direction and the first direction are perpendicular to each other, and the flow channel plate 2 is provided with a flow channel groove 231. The flow channel groove 231 and the outer surface of each of the first side wall 13 and the third side wall 14 define a cooling flow channel 23. Alternatively, the flow channel groove 231 and the outer surface of each of the first side wall 13, the second side wall, the third side wall 14 and the fourth side wall define a cooling flow channel 23.

[0044] That is, the flow channel plate 2 can cover only two adjacent side surfaces on the peripheral wall, or can cover all side surfaces on the peripheral wall. In this case, the cooling flow channel 23 formed is in direct heat exchange contact with at least one large surface, thereby effectively ensuring the heat exchange efficiency between the coolant and the shell 1 of the battery cell.

[0045] Specifically, the first direction is the height direction of the battery cell, the second direction is the width direction of the battery cell, and the third direction is the length direction of the battery cell. The outer contour of the housing 1 is a rectangular parallelepiped, and the outer surface of each of the first side wall 13 to the fourth side wall is a plane. Figure 2 As shown, the flow channel plate 2 may be an L-shaped plate that only covers the first side wall 13 and the third side wall 14. Figure 4 As shown, the flow channel plate 2 can also be an annular plate covering the first side wall 13 to the fourth side wall. The annular plate can be opened at the junction of the first side wall 13 and the fourth side wall, or can be connected end to end.

[0046] In some embodiments, Figure 5As shown, a portion of the flow channel plate 2 is connected to the peripheral wall, and the remaining portion of the flow channel plate 2 is recessed in a direction away from the peripheral wall to form a flow channel groove 231 , and a cooling flow channel 23 is defined between the flow channel groove 231 and the outer surface of the peripheral wall.

[0047] That is, the cooling channel 23 is mainly formed by processing the channel groove 231 on the channel plate 2, so there is no need to reprocess the surrounding wall of the battery cell shell 1. The battery cell of this embodiment can be formed by simply connecting the channel plate 2 to the battery cell shell 1 in the related technology. The production cost of the battery cell of this embodiment is low.

[0048] Specifically, the flow channel plate 2 can be integrally formed by stamping. Figure 4 As shown, the corners of the flow channel plate 2 are also rounded to improve the structural strength of the corners of the flow channel plate 2.

[0049] For example, taking the thickness of the flow channel plate 2 at various positions as 1 mm-1.5 mm, the radius of the rounded corners of the flow channel plate 2 is set to be greater than or equal to 2 mm, thereby facilitating the stamping of the flow channel plate 2 .

[0050] In some embodiments, Figure 1 and Figure 3 As shown, the portion of the flow channel plate 2 that forms the flow channel groove 231 includes a plurality of first segments 21 and a plurality of second segments 22 that are alternately arranged along a first direction, any adjacent first segments 21 and second segments 22 are interconnected, an extension direction of the first segment 21 is perpendicular to the first direction, and an extension direction of the second segment 22 is consistent with the first direction.

[0051] Among them, the extension direction of the first section 21 and the second section 22 is consistent with the extension direction of the flow channel groove 231, and multiple first sections 21 are arranged at intervals along the first direction, so that the cooling flow channel 23 formed thereby is evenly distributed on the outer surface of the surrounding wall, so that the contact area between the coolant and the outer surface of the surrounding wall is larger, and the heat exchange efficiency between the coolant and the battery cell is higher.

[0052] Specifically, Figure 1 As shown, a plurality of first segments 21 are arranged at equal intervals along the first direction, the upper end of the second segment 22 is connected to one end of an adjacent first segment 21, and the lower end of the second segment 22 is connected to one end of another adjacent first segment 21. At this time, the cooling channel 23 defined by the first segment 21, the second segment 22 and the peripheral wall extends in a serpentine shape along the first direction.

[0053] like Figure 1 and Figure 2 As shown, taking the example of the flow channel plate 2 being connected to the first side wall 13 and the third side wall 14 , the length of the first section 21 is adjacent to the sum of the dimension of the first side wall 13 in the second direction and the dimension of the third side wall 14 in the third direction.

[0054] In some embodiments, Figure 5 As shown, the distance between any two adjacent first sections 21 is D1, the distance between the first section 21 adjacent to the first end plate 11 and the outer surface of the first end plate 11 is D2, and the distance between the first section 21 adjacent to the second end plate and the outer surface of the second end plate is D3, wherein D1≥8mm, D2≥8mm, and D3≥8mm.

[0055] This size ensures that the portion of the flow channel plate 2 connected to the peripheral wall has sufficient width, thereby ensuring that the connection sealing reliability between the flow channel plate 2 and the peripheral wall is higher, thereby effectively avoiding leakage or cross-flow of the cooling channel 23 and affecting the heat dissipation reliability of the coolant to the battery cell.

[0056] Specifically, the portion of the flow channel plate 2 except the formed flow channel groove 231 is in contact with the outer surface of the peripheral wall, and D1, D2 and D3 may be equal and be 8 mm, 9 mm or 10 mm.

[0057] In some embodiments, the depth of the flow channel groove 231 is H, the width of the flow channel groove 231 is W, and the thickness at any position in the flow channel plate 2 is T, wherein 2mm≤H≤4mm, W≤28mm, and 1mm≤T≤1.5mm.

[0058] By setting 1mm≤T≤1.5mm, the flow channel plate 2 is ensured to have sufficient structural strength to prevent it from being easily deformed when subjected to external pressure, which may cause the cooling channel 23 to collapse and be blocked. By setting 2mm≤H≤4mm and W≤28mm, on the one hand, the cooling channel 23 is ensured to have sufficient cross-sectional area, thereby ensuring a larger flow rate of the coolant in the cooling channel 23 and a higher heat exchange efficiency with the battery cell; on the other hand, the anti-deformation strength of the first section 21 and the second section 22 in the flow channel plate 2 will not be affected due to the excessive depth and width of the flow channel groove 231.

[0059] Specifically, the depth H of the flow channel groove 231 can be 2 mm, 3 mm and 4 mm, the width W of the flow channel groove 231 can be 20 mm, 25 mm and 28 mm, and the thickness T of the flow channel plate 2 at any position is equal and can be 1 mm, 1.2 mm and 1.5 mm.

[0060] In some embodiments, the cooling channel 23 has a first end and a second end opposite to each other in a first direction, and the first water outlet 24 and the second water outlet 25 are respectively disposed at the first end and the second end of the cooling channel 23. The battery cell further includes a first water nozzle 3 and a second water nozzle 4, the first water nozzle 3 is connected to the first water outlet 24, and the second water nozzle 4 is connected to the second water outlet 25.

[0061] That is, the first water nozzle 3 and the second water nozzle 4 are integrated on the flow channel plate 2 of the battery cell, so that the cooling flow channel 23 in the battery cell can be quickly and reliably connected to the external liquid cooling system through the first water nozzle 3 and the second water nozzle 4. Moreover, the serpentine flow channel design makes the flow route of the coolant in the cooling fluid simple and reliable.

[0062] Specifically, the first water nozzle 3 and the second water nozzle 4 are respectively inserted into the first water outlet 24 and the second water outlet 25 and riveted to the flow channel plate 2. The two ends of the through holes of the first water nozzle 3 and the second water nozzle 4 are arc-shaped transitions, so that the through hole of each of the first water nozzle 3 and the second water nozzle 4 is smoothly connected with the cooling flow channel 23, thereby facilitating the coolant to flow smoothly between each of the first water nozzle 3 and the second water nozzle 4 and the cooling flow channel 23 with little resistance.

[0063] like Figure 6-Figure 8 As shown, the battery cell group according to the embodiment of the present application includes multiple battery cells as in any of the above embodiments, the multiple battery cells are arranged in sequence along the second direction, and any two adjacent battery cells are bonded by thermal conductive adhesive.

[0064] According to the battery cell group of the embodiment of the present application, by adopting the battery cells of the above embodiment, it has the advantages of high heat exchange efficiency with the coolant and high integration of the cooling system. In addition, two adjacent battery cells are connected by heat transfer through thermal conductive glue, and no heat insulation pad is required between the two, which effectively improves the space utilization of the battery cell group.

[0065] Specifically, Figure 6-Figure 8 As shown, no matter the flow channel plate 2 is set as an L-shaped plate or an annular plate, when multiple battery cells are bonded by thermal conductive adhesive to form a battery cell group, the large surface of the battery cell shell 1 is in heat exchange contact with at least one flow channel plate 2, and the battery cell has a strong thermal runaway protection capability.

[0066] The vehicle according to the embodiment of the present application includes the battery cell group as described in the above embodiment.

[0067] The technical advantages of the vehicle according to the embodiment of the present application are the same as the technical advantages of the battery pack of the above-mentioned embodiment, and will not be repeated here.

[0068] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0069] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0070] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0071] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0072] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0073] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present application. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present application.

Claims

1. A battery cell, characterized in that: It includes a shell and a flow channel plate, wherein the flow channel plate is connected to the shell and is located outside the shell, a cooling flow channel is defined between the flow channel plate and the shell, and a first water outlet and a second water outlet connected to the cooling flow channel are provided on the flow channel plate.

2. The battery cell according to claim 1, characterized in that: The housing comprises a first end plate and a second end plate opposite to each other in a first direction, and at least one of the first end plate and the second end plate is provided with a pole; The shell further includes a peripheral wall connecting the first end plate and the second end plate, the flow channel plate is connected to the peripheral wall, and the cooling flow channel is defined between the flow channel plate and the peripheral wall.

3. The battery cell according to claim 2, characterized in that: The peripheral wall includes a first side wall and a second side wall opposite to each other along a second direction, and includes a third side wall and a fourth side wall opposite to each other along a third direction, wherein the second direction, the third direction and the first direction are perpendicular to each other, wherein: The flow channel plate is provided with a flow channel groove, and the cooling flow channel is defined between the flow channel groove and the outer surface of each of the first side wall and the third side wall; Alternatively, the flow channel plate is provided with a flow channel groove, and the flow channel groove and the outer surface of each of the first side wall, the second side wall, the third side wall and the fourth side wall define the cooling flow channel.

4. The battery cell according to claim 2, characterized in that: A portion of the flow channel plate is connected to the peripheral wall, and the remaining portion of the flow channel plate is bent in a direction away from the peripheral wall to form a boss, the boss defines a flow channel groove opposite to the outer surface of the peripheral wall, and the cooling flow channel is defined between the flow channel groove and the outer surface of the peripheral wall.

5. The battery cell according to claim 4, characterized in that: The portion of the flow channel plate that forms the flow channel groove includes a plurality of first segments and a plurality of second segments alternately arranged along a first direction, any adjacent first segments and second segments are interconnected, an extension direction of the first segment is perpendicular to the first direction, and an extension direction of the second segment is consistent with the first direction.

6. The battery cell according to claim 5, characterized in that: The distance between any two adjacent first sections is D1, the distance between the first section adjacent to the first end plate and the outer surface of the first end plate is D2, and the distance between the first section adjacent to the second end plate and the outer surface of the second end plate is D3, wherein D1≥8mm, D2≥8mm, and D3≥8mm.

7. The battery cell according to claim 5, characterized in that: The depth of the flow channel groove is H, the width of the flow channel groove is W, and the thickness at any position in the flow channel plate is T, wherein 2mm≤H≤4mm, W≤28mm, and 1mm≤T≤1.5mm.

8. The battery cell according to claim 2, characterized in that: The cooling channel has a first end and a second end opposite to each other in the first direction, and the first water outlet and the second water outlet are respectively arranged at the first end and the second end of the cooling channel; The battery cell further includes a first water nozzle and a second water nozzle, wherein the first water nozzle is connected to the first water outlet, and the second water nozzle is connected to the second water outlet.

9. A battery cell group, characterized in that: It comprises a plurality of battery cells as described in any one of claims 1 to 8, wherein the plurality of battery cells are arranged in sequence along the second direction, and any two adjacent battery cells are bonded by thermally conductive adhesive.

10. A vehicle, characterized in that: Comprising the battery cell group as claimed in claim 9.

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