CN217822993U

CN217822993U - Battery and battery device

Info

Publication number: CN217822993U
Application number: CN202221948652.4U
Authority: CN
Inventors: 关俊山; 谷亮杰; 颜廷露; 张勇杰
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-07-26
Filing date: 2022-07-26
Publication date: 2022-11-15
Anticipated expiration: 2032-07-26

Abstract

The embodiment of the utility model provides a relate to battery technical field, and disclose a battery and battery device, the battery includes body and bulge, and the protruding terminal surface of locating the body of bulge, the terminal surface of body and the lateral wall face of bulge form the holding tank, and the holding tank is used for holding at least partial heat transfer structure. The accommodating groove used for accommodating at least part of the heat exchange structure is formed on the end face of the body and the side wall face of the protruding portion, so that the heat exchange structure can be more fully contacted with the battery, the heat dissipation performance is improved, and the battery is more conveniently assembled and fixed with the heat exchange structure in the accommodating groove in the at least part of the heat exchange structure.

Description

Battery and battery device

Technical Field

The utility model relates to a battery technology field particularly, relates to a battery and battery device.

Background

At present, the energy storage performance of a new energy battery is higher and higher, the temperature rise of the battery is overhigh due to high-rate charge and discharge in the using process, the performance, the service life and the like of the battery are influenced, and if the temperature rise cannot be effectively treated, even thermal runaway can be caused, and the short circuit or explosion of the battery is caused. However, the heat dissipation performance of the battery in the related art is not good, and the reliability of the operation of the battery is affected.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a can improve battery heat dispersion's battery and battery device.

The utility model discloses battery, including body and bulge, the bulge is protruding to be located the terminal surface of body, the terminal surface of body with the lateral wall face of bulge forms the holding tank, the holding tank is used for holding at least partial heat transfer structure.

The battery device provided by the embodiment of the utility model comprises a plurality of batteries, a plurality of busbars and a heat exchange structure, wherein the batteries are arranged side by side; the plurality of busbars are arranged on one sides of the plurality of batteries and connected to the pole assemblies of the plurality of batteries; at least part of the heat exchange structure is accommodated in the accommodating groove of the battery and is in heat conduction connection with the groove wall of the accommodating groove.

One embodiment of the above utility model has at least the following advantages or beneficial effects:

the utility model discloses battery and battery device forms the holding tank that is used for holding at least partial heat transfer structure through the terminal surface at the body and the lateral wall face of bulge for heat transfer structure can contact more fully with the battery, improves heat dispersion, and in at least partial heat transfer structure located the holding tank, the battery of also being more convenient for was fixed with heat transfer structure's equipment.

Drawings

Fig. 1 is a schematic perspective view of a battery device according to an embodiment of the present invention.

Fig. 2 shows an exploded view of fig. 1.

Fig. 3 shows a perspective view of the battery of fig. 1.

Fig. 4 shows a partial enlarged view at X1 in fig. 3.

Fig. 5 is a schematic view of the heat exchange structure of fig. 1 without the heat exchange structure.

Fig. 6 shows a partial enlarged view at X2 in fig. 5.

Fig. 7 shows a schematic side view of fig. 1.

Fig. 8 shows a partial enlarged view at X3 in fig. 7.

Fig. 9 shows a schematic view of an insulating layer and a thermally conductive layer disposed between a heat exchanging structure and a battery.

Fig. 10 is a schematic view showing the assembly of the battery having the flange structure and the heat exchange structure according to the first embodiment of the present invention.

Fig. 11 is a schematic view showing the assembly of a battery having a flange structure and a heat exchange structure according to a second embodiment of the present invention.

Fig. 12 is a schematic view showing the assembly of a battery having a flange structure and a heat exchange structure according to a third embodiment of the present invention.

Wherein the reference numerals are as follows:

100. battery device

1. Battery with a battery cell

11. Body

12. Projecting part

13. Pole component

14. Flange structure

15. Accommodating tank

16. Installation channel

17. Dodging groove

2. Bus bar

21. Arching part

22. Electrode connection part

3. Heat exchange structure

31. Substrate part

32. Extension part

33. First flow channel

34. Second flow channel

35. Insulating layer

36. Groove

41. First heat-conducting adhesive layer

42. Heat conducting member

43. Second heat-conducting adhesive layer

44. Third heat-conducting adhesive layer

45. Heat conducting layer

L, length

W, width

T, thickness

D1, first direction

D2, second direction

D3, third direction

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.

As shown in fig. 1 and fig. 2, fig. 1 is a schematic perspective view of a battery device 100 according to an embodiment of the present invention. Fig. 2 shows an exploded view of fig. 1. The utility model discloses battery device 100 includes a plurality of batteries 1, a plurality of busbar 2 and heat transfer structure 3. The plurality of batteries 1 are arranged side by side, and the plurality of bus bars 2 are connected to the plurality of batteries 1 to serially connect the plurality of batteries 1. The heat exchanging structure 3 is in heat conducting connection with the plurality of batteries 1 and/or the plurality of busbars 2 to cool the batteries 1 and the busbars 2.

It will be understood that the terms "comprises" and "comprising," and any variations thereof, in the embodiments of the present invention, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or may alternatively include other steps or elements inherent to such process, method, article, or apparatus.

As shown in fig. 3 and 4, fig. 3 is a perspective view schematically showing the battery 1 in fig. 1. Fig. 4 shows a partial enlarged view at X1 in fig. 3. Each cell 1 includes a body 11, a projection 12 and a pole assembly 13.

The protruding portion 12 protrudes from the end surface of the body 11, the end surface of the body 11 and the side wall surface of the protruding portion 12 form an accommodating groove 15, and the accommodating groove 15 is used for accommodating at least part of the heat exchange structure 3.

An accommodating groove 15 for accommodating at least part of the heat exchange structure 3 is formed on the end face of the body 11 and the side wall face of the protruding part 12, so that the heat exchange structure 3 can be more fully contacted with the battery 1, the heat dissipation performance is improved, and at least part of the heat exchange structure 3 is arranged in the accommodating groove 15, and the battery 1 and the heat exchange structure 3 can be assembled and fixed conveniently.

As an example, the battery 1 has a length L in the first direction D1, a width W in the second direction D2, and a thickness T in the third direction D3. The first direction D1, the second direction D2 and the third direction D3 are perpendicular to each other two by two. The length L may be significantly greater than the width W and thickness T such that the cell 1 forms a substantially flat rectangular parallelepiped.

Of course, in other embodiments, the length L of the battery 1 may be slightly larger than the width W and the thickness T, so that the battery 1 forms a rectangular parallelepiped with a slightly thicker thickness T.

The plurality of batteries 1 are arranged side by side along the third direction D3, and adjacent two batteries 1 are in large-area correspondence. It is understood that the large face of the battery 1 refers to a side surface where the area of the battery 1 is the largest. Specifically to the present embodiment, the large face of the battery 1 refers to the surface formed by the length L and the width W.

Referring to fig. 3 and 4, the protrusion 12 is protruded from the end surface of the body 11 along the first direction D1. Along the second direction D2, two opposite sides of the protruding portion 12 are each provided with a receiving groove 15. Two holding grooves 15 are used for holding heat transfer structure 3 along second direction D2's both ends, are favorable to heat transfer structure 3 and battery 1 to follow the fixed equipment in second direction D2's both ends.

As can be seen from fig. 1, after the batteries 1 are arranged side by side, the receiving grooves 15 on the same side of the batteries 1 are correspondingly arranged and communicated with each other, so that the receiving grooves 15 on the same side form a mounting channel 16, and the mounting channel 16 is used for receiving at least part of the heat exchange structure 3.

The pole assembly 13 is connected to the projection 12, and the pole assembly 13 is offset from the receiving groove 15 in the projecting direction of the projection 12.

As an example, one large surface of the protruding portion 12 is flush with the large surface of the body 11, and the pole assembly 13 is protruded from the large surface of the protruding portion 12. An avoiding groove 17 is formed between the other large surface of the convex part 12 and the end surface of the body 11, and the avoiding groove 17 can be communicated with the accommodating groove 15. When a plurality of batteries 1 are arranged side by side, the escape groove 17 is used for escaping the pole assembly 13 of another adjacent battery 1.

As shown in fig. 5, fig. 5 is a schematic view of fig. 1 with the heat exchange structure 3 removed. The plurality of bus bars 2 are disposed at one side of the batteries 1 in the first direction D1, and are connected to the pole assemblies 13 of the plurality of batteries 1.

Specifically, the plurality of bus bars 2 located on one side of the plurality of cells 1 in the first direction D1 are arranged side by side along the arrangement direction of the cells 1. Both ends of each bus bar 2 are connected to the pole assemblies 13 of the adjacent two batteries 1, respectively.

As shown in fig. 6, fig. 6 is a partially enlarged view at X2 in fig. 5. The bus bar 2 is staggered from the receiving groove 15 of the battery 1 in the first direction D1. The bus bar 2 includes an arch portion 21 and two electrode connection portions 22, the two electrode connection portions 22 being connected to two opposite side edges of the arch portion 21, respectively. The two electrode connecting portions 22 are connected to the pole assemblies 13 of the adjacent two batteries 1, respectively. Along the first direction D1, the bulge portion 21 is provided corresponding to the convex portion 12 of the battery 1.

Referring to fig. 2, the heat exchanging structure 3 is disposed on one side of the battery 1 along the first direction D1. Part heat exchange structure 3 sets up in the busbar 2 and deviates from battery 1 one side to with battery 1 and/or busbar 2 heat conduction connection. Part of the heat exchanging structure 3 is accommodated in the accommodating groove 15 of the battery 1.

On the one hand, set up heat transfer structure 3 in the side of a plurality of batteries 1 for heat transfer structure 3's setting can not occupy the space of the top and the bottom of a plurality of batteries 1, has improved direction of height's space utilization. On the other hand, because the heat that utmost point post subassembly 13 of battery 1 produced compares in other positions more, through heat transfer structure 3 and battery 1 and/or busbar 2 heat conduction connection for heat transfer structure 3 can dispel the heat to battery 1 and/or busbar 2, has effectively solved the problem that the temperature rise is too high near position and the busbar 2 temperature rise of utmost point post subassembly 13 of battery 1. On the other hand, the heat exchange structure 3 is not arranged at the bottom of the batteries 1, so that the heat exchange structure 3 does not need to bear the weight of the batteries 1, the reliability of the heat exchange structure 3 is improved, and the service life is prolonged.

It will be appreciated that the heat exchange structure 3 may employ both air cooling and liquid cooling. When heat exchange structure 3 adopts liquid cooling, heat exchange structure 3 can include liquid cooling board, and the inside coolant liquid that is equipped with of liquid cooling board.

As shown in fig. 7 and 8, fig. 7 is a side view schematic of fig. 1. Fig. 8 shows a partially enlarged view at X3 in fig. 7. The heat exchanging structure 3 includes a base plate portion 31 and two extending portions 32. The substrate portion 31 is provided on a side of the bus bar 2 away from the battery 1. The two extending portions 32 are respectively connected to the two opposite ends of the base plate portion 31 along the second direction D2 of the battery 1, and respectively extend from the base plate portion 31 to the inside of the two accommodating grooves 15. Each extending portion 32 is perpendicular to the base plate portion 31, that is, the base plate portion 31 and the two extending portions 32 form a substantially C-shaped structure, so that the heat exchange area of the heat exchange structure 3 can be increased, and the heat dissipation efficiency can be improved.

The side of the heat exchange structure 3 facing away from the battery 1 is a plane. The heat exchange structure 3 is arranged on the side surface of the plurality of batteries 1 and is equivalent to cover the side ends of the plurality of batteries 1. Through designing the side that deviates from battery 1 with heat transfer structure 3 for the plane, heat transfer structure 3's surface uniformity is better, more makes things convenient for battery 1 to become in groups, and is convenient for the assembly of other parts in battery device 100.

Specifically, the side of the base plate portion 31 facing away from the battery 1 may be a flat surface, and the side of each extending portion 32 facing away from the battery 1 may also be a flat surface.

With continued reference to fig. 8, the heat exchange structure 3 has a first flow passage 33 and a second flow passage 34 therein. In the first direction D1, the first flow passage 33 is disposed corresponding to the bus bar 2, and the second flow passage 34 is disposed corresponding to a region of the battery 1 not covered by the bus bar 2. The flow area of the first flow passage 33 is smaller than the flow area of the second flow passage 34.

It is understood that the temperature of the bus bar 2 increases above the temperature rise of the battery 1. In this embodiment, the flow area of the first flow channel 33 is smaller than the flow area of the second flow channel 34, so that the flow velocity of the cooling liquid passing through the first flow channel 33 is greater than the flow velocity of the cooling liquid passing through the second flow channel 34, and the heat exchange efficiency of the first flow channel 33 corresponding to the bus bar 2 is higher, thereby facilitating timely cooling of the bus bar 2 with higher temperature rise.

The dimension L1 of the first flow channel 33 is smaller than the dimension L2 of the second flow channel 34 along the first direction D1, which facilitates the manufacturing of the heat exchange structure 3.

As shown in fig. 9, fig. 9 is a schematic view showing that an insulating layer 35 and a heat conductive layer 45 are provided between the heat exchanging structure 3 and the battery 1. The heat exchanging structure 3 is provided with an insulating layer 35 on a surface facing the bus bar 2. By providing the insulating layer 35 between the heat exchanging structure 3 and the bus bar 2, it is possible to prevent the bus bar 2 from being electrically connected to the heat exchanging structure 3, which causes a safety problem.

It is understood that the insulating layer 35 may be an insulating film, but is not limited thereto.

As an example, the insulating layer 35 is provided on a surface of the substrate portion 31 of the heat exchanging structure 3 on a side facing the bus bar 2.

The heat exchanger 3 is connected to the busbar 2 and/or the battery 1 via a heat conducting layer 45. The heat conducting layer 45 may include a heat conducting glue, a heat conducting silicone pad, or the like. When the heat conduction layer 45 is made of heat conduction glue, the heat conduction glue can play a role in fixing the heat exchange structure 3 and can also be used as a heat conduction medium to conduct heat generated by the busbar 2 and/or the battery 1 to the heat exchange structure 3 in time.

Specifically, a heat conductive layer 45 is provided between the base plate portion 31 of the heat exchange structure 3 and the region of the battery 1 where the protruding portion 12 is not covered by the bus bar 2, a heat conductive layer 45 is provided between the base plate portion 31 and the bus bar 2, and a heat conductive layer 45 is also provided between the extending portion 32 and the groove wall of the accommodation groove 15.

As shown in fig. 10, fig. 10 is a schematic view illustrating the assembly of the battery 1 with the flange structure 14 and the heat exchange structure 3 according to the first embodiment of the present invention. The battery 1 further comprises a flange structure 14, and the flange structure 14 is convexly arranged on the body 11.

As an example, the flange structure 14 surrounds the outer periphery of the body 11 and the projection 12 in a plane formed by the first direction D1 and the second direction D2.

The side of the heat exchanging structure 3 facing the battery 1 is provided with a groove 36, and the groove 36 accommodates at least part of the flange structure 14 in the protruding direction of the flange structure 14. When the heat exchanging structure 3 is installed on one side of the battery 1, the flange structure 14 of the battery 1 can extend into the groove 36 of the heat exchanging structure 3, so that the side of the heat exchanging structure 3 facing the battery 1 can be matched with the side surface of the battery 1 in a profiling mode. On the basis of ensuring the firm connection of the heat exchange structure 3, the heat conduction efficiency between the heat exchange structure 3 and the battery 1/the bus bar 2 can be improved.

As shown in fig. 11, fig. 11 is a schematic diagram illustrating the assembly of the battery 1 with the flange structure 14 and the heat exchange structure 3 according to the second embodiment of the present invention. A first heat-conducting adhesive layer 41 is arranged between the outer surface of the protruding part 12 of the battery 1 and the heat exchange structure 3, and the thickness of the first heat-conducting adhesive layer 41 is greater than or equal to the protruding height of the flange structure 14.

Through the design that the thickness of the first heat conductive adhesive layer 41 is greater than or equal to the protruding extension height of the flange structure 14, the heat exchange structure 3 can be tightly connected with the battery 1 through the first heat conductive adhesive layer 41 in a heat conduction manner, and the problem that a hole/gap exists between the heat exchange structure 3 and the battery 1 due to the fact that the thickness of the first heat conductive adhesive layer 41 is lower than the protruding extension height of the flange structure 14, and further the heat conduction efficiency is influenced is avoided.

As shown in fig. 12, fig. 12 is a schematic view illustrating the assembly of the battery 1 with the flange structure 14 and the heat exchanging structure 3 according to the third embodiment of the present invention. A heat conducting member 42 is arranged between the outer surface of the protruding part 12 of the battery 1 and the heat exchanging structure 3, and the heat exchanging structure 3 and the protruding part 12 are connected through the heat conducting member 42. A second adhesive layer 43 is arranged between the heat-conducting member 42 and the outer surface of the protruding portion 12, and a third adhesive layer 44 is arranged between the heat-conducting member 42 and the heat exchanging structure 3. The sum of the thicknesses of the second thermal conductive adhesive layer 43 and the thermal conductive member 42 is greater than or equal to the protruding height of the flange structure 14.

When the protruding extension height of the flange structure 14 is high, for example, 2 mm or more, 3mm or more, due to the fluidity of the heat-conducting adhesive itself, before the heat-conducting adhesive is cured, the heat-conducting adhesive is not stably fixed between the protrusion portion 12 and the heat exchange structure 3, and under the action of gravity, the heat-conducting adhesive flows to other positions of the battery 1, so that the heat-conducting adhesive layer between the outer surface of the protrusion portion 12 and the heat exchange structure 3 cannot satisfy the protruding extension height of the flange structure 14 or more, and further the heat-conducting adhesive layer cannot be fully filled between the protrusion portion 12 and the heat exchange structure 3.

The utility model discloses in the third embodiment, through set up heat-conducting piece 42, first heat-conducting glue layer 41 and second heat-conducting glue layer 43 between heat transfer structure 3 and bulge 12, fill first heat-conducting glue layer 41 between heat-conducting piece 42 and the bulge 12, fill second heat-conducting glue layer 43 between heat-conducting piece 42 and the heat transfer structure 3. Due to the provision of the heat-conductive members 42, the thicknesses of the first and second heat-conductive adhesive layers 41 and 43 can be reduced. Under the condition that the thicknesses of the first heat-conducting adhesive layer 41 and the second heat-conducting adhesive layer 43 are relatively thin, the first heat-conducting adhesive layer 41 and the second heat-conducting adhesive layer 43 are not easy to flow, but are stably filled in the preset positions of the protruding portions 12, so that the requirement that the sum of the thicknesses of the second heat-conducting adhesive layer 43 and the heat-conducting piece 42 is greater than or equal to the protruding height of the flange structure 14 is met, and the heat conduction efficiency is prevented from being influenced due to the holes/gaps between the heat exchange structure 3 and the battery 1.

It is understood that the heat conductive member 42 may have a plate-like structure. The heat-conducting member 42 may be made of graphite, carbon fiber, or the like.

Further, the thickness of the second thermal adhesive layer 43 is smaller than the protruding height of the flange structure 14. Thus, at least a part of the heat-conducting member 42 does not extend beyond the flange structure 14 in the projecting height direction of the flange structure 14, ensuring the stability of the connection of the heat-conducting member 42.

It is understood that the various embodiments/implementations provided by the present invention can be combined without contradiction, and are not illustrated herein.

In the utility model embodiments, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are used broadly and should be construed to include, for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the embodiments of the present invention can be understood by those skilled in the art according to specific situations.

In the description of the embodiments of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the embodiments of the present invention and simplification of the description, but do not indicate or imply that the device or unit indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the embodiments of the present invention.

In the description of the present specification, the terms "one embodiment," "some embodiments," "specific embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of an embodiment of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the invention and is not intended to limit the same, and various modifications and changes may be made to the embodiment by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the embodiments of the present invention should be included in the scope of the embodiments of the present invention.

Claims

1. A battery, comprising:

a body; and

the bulge is convexly arranged on the end face of the body, the end face of the body and the side wall face of the bulge form an accommodating groove, and the accommodating groove is used for accommodating at least part of the heat exchange structure.

2. The battery of claim 1, wherein the protrusion protrudes from the end surface of the body in a first direction;

along a second direction, the two opposite side surfaces of the protruding part are provided with the accommodating grooves;

wherein the second direction is perpendicular to the first direction.

3. The battery of claim 1, further comprising a post assembly connected to the protrusion and offset from the receiving groove in a direction of protrusion of the protrusion.

4. A battery device, comprising:

a plurality of the cells of any one of claims 1 to 3, arranged side by side;

a plurality of busbars disposed at one side of the plurality of batteries and connected to the plurality of batteries; and

and at least part of the heat exchange structure is accommodated in the accommodating groove of the battery and is in heat conduction connection with the groove wall of the accommodating groove.

5. The battery device according to claim 4, wherein the heat exchanging structure is disposed on one side of the plurality of batteries, and a part of the heat exchanging structure is disposed on one side of the bus bar facing away from the batteries and is thermally conductive connected to the batteries and/or the bus bar.

6. The battery device of claim 5, wherein the heat exchanging structure comprises:

the substrate part is arranged on one side of the bus bar, which is far away from the battery; and

and the two extending parts are respectively connected with the two ends of the edge of the base plate part and respectively extend towards the two accommodating grooves from the base plate part.

7. The battery device according to claim 6, wherein each of the extending portions is perpendicular to the base plate portion.

8. The battery device according to claim 5, wherein a surface of the heat exchanging structure facing the bus bar is provided with an insulating layer.

9. The battery device of claim 5, wherein the heat exchanging structure has a first flow channel and a second flow channel inside;

along the protruding direction of the protruding part of the battery, the first flow channel is arranged corresponding to the bus bar, and the second flow channel is arranged corresponding to the area of the battery which is not covered by the bus bar;

the flow area of the first flow passage is smaller than that of the second flow passage.

10. The battery device according to claim 9, wherein a dimension of the first flow channel is smaller than a dimension of the second flow channel in a projecting direction of the projection portion.

11. The battery device of claim 5, wherein the heat exchange structure is connected to the bus bar and/or the cells via a thermally conductive layer.

12. The battery device of claim 4, wherein the side of the heat exchange structure facing away from the battery is planar.

13. The battery device of claim 4, wherein the battery further comprises a flange structure protruding from the body.

14. The battery device of claim 13, wherein a side of the heat exchanging structure facing the battery is provided with a groove, and the groove receives at least a part of the flange structure along a protruding direction of the flange structure.

15. The battery device according to claim 13, wherein a first thermal adhesive layer is disposed between the outer surface of the protruding portion and the heat exchanging structure, and a thickness of the first thermal adhesive layer is greater than or equal to a protruding height of the flange structure.

16. The battery device according to claim 13, wherein a heat conducting member is provided between an outer surface of the protrusion and the heat exchanging structure, and the heat exchanging structure and the protrusion are connected by the heat conducting member;

a second heat-conducting adhesive layer is arranged between the heat-conducting piece and the outer surface of the protruding part, and a third heat-conducting adhesive layer is arranged between the heat-conducting piece and the heat exchange structure;

the sum of the thicknesses of the second heat-conducting adhesive layer and the heat-conducting piece is greater than or equal to the protruding height of the flange structure.

17. The battery device of claim 16, wherein the thickness of the second layer of thermally conductive adhesive is less than the protrusion height of the flange structure.

18. The battery device of claim 4, wherein the plurality of receiving slots on the same side of the plurality of batteries are in communication and form a mounting channel for receiving at least a portion of the heat exchanging structure.

19. The battery device according to claim 4, wherein the bus bar is misaligned with the receiving groove of the battery in a protruding direction of the protruding portion of the battery.

20. The battery device according to claim 19, wherein the bus bar comprises:

an arch part disposed corresponding to the protruding part of the battery; and

and the two electrode connecting parts are respectively connected to the pole assemblies of the two adjacent batteries.