CN217823040U

CN217823040U - Battery device

Info

Publication number: CN217823040U
Application number: CN202221947771.8U
Authority: CN
Inventors: 谷亮杰; 关俊山; 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 device, including a plurality of batteries, a plurality of busbar and heat transfer structure. The plurality of batteries are arranged side by side, and the plurality of busbars are arranged on one side of the plurality of batteries and connected to the plurality of batteries. The heat exchange structure and the bus bar are positioned on the same side of the battery and are in heat conduction connection with the battery and the bus bar. Set up the side at a plurality of batteries with heat transfer structure for heat transfer structure's setting can not occupy the space of the top and the bottom of a plurality of batteries, has improved direction of height's space utilization. The heat transfer structure is connected with battery and busbar heat conduction for the heat transfer structure can dispel the heat to battery and busbar simultaneously, has effectively solved near the utmost point post subassembly position of battery and the too high problem of busbar temperature rise, has improved the thermal safety performance. The heat exchange structure is not arranged at the bottoms of the batteries, so that the heat exchange structure does not need to bear the weight of the batteries, the reliability of the heat exchange structure is improved, and the service life is prolonged.

Description

Battery device

Technical Field

The embodiment of the utility model provides a relate to battery technical field, particularly, relate to a 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 use process, the performance, the service life and the like of the battery are influenced, and if the temperature rise is not 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 device of battery heat dispersion.

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 side of the plurality of batteries and connected to the plurality of batteries; the heat exchange structure and the bus bar are positioned on the same side of the battery and are in heat conduction connection with the battery and the bus bar.

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

the utility model discloses battery device, heat transfer structure set up in the side of a plurality of batteries, and with battery and busbar heat conduction be connected. On the one hand, the heat exchange structure is arranged on the side faces of the batteries, so that the heat exchange structure can not occupy the space at the tops and the bottoms of the batteries, and the space utilization rate of the height direction is improved. On the other hand, heat transfer structure leads the thermal connection with battery and busbar for heat transfer structure can dispel the heat to battery and busbar simultaneously, has effectively solved near the position of utmost point post subassembly of battery and the too high problem of busbar temperature rise, has improved the thermal safety performance. On the other hand, the heat exchange structure is not arranged at the bottoms of the batteries, so that the heat exchange structure does not need to bear the weight of the batteries, the reliability of the heat exchange structure is improved, and the service life is prolonged.

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 fig. 1 with the heat exchange structure removed.

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 exchange 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. Noumenon

13. Pole component

14. Flange structure

17. Dodging groove

2. Bus bar

21. Arching part

22. Electrode connection part

3. Heat exchange structure

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 a detailed description thereof 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 exchange structure 3 is connected to the plurality of batteries 1 and the plurality of bus bars 2 in a heat conductive manner to dissipate heat from the batteries 1 and the bus bars 2.

It is to 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 and a pole assembly 13.

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.

As an example, the length L is much greater than the width W and the thickness T, so that the battery 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, that is, 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.

With reference to fig. 3 and fig. 4, the terminal assembly 13 is disposed at an end of the battery 1 along the first direction D1 and protrudes from a large surface of the main body 11. The number of the pole assemblies 13 is two, and the two pole assemblies are respectively disposed at two end portions of the battery 1 along the first direction D1. One of the pole assemblies 13 serves as a positive electrode and the other as a negative electrode.

As an example, an avoiding groove 17 is formed on a side surface of the body 11 facing away from the pole assembly 13, and the avoiding groove 17 is disposed at one end of the body 11 along the first direction D1. 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 on 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 busbar 2 includes an arch portion 21 and two electrode connecting portions 22, and the two electrode connecting portions 22 are 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.

Referring to fig. 2, the heat exchanging structure 3 is disposed at one side of the battery 1 along the first direction D1, that is, the heat exchanging structure 3 and the bus bar 2 are located at the same side of the battery 1. The heat exchange structure 3 is arranged on one side of the bus bar 2, which is far away from the battery 1, and is in heat conduction connection with the battery 1 and the bus bar 2.

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 battery 1's utmost point post subassembly 13 produced compares in other positions more, is connected through heat transfer structure 3 and battery 1 and busbar 2 heat conduction for heat transfer structure 3 can dispel the heat to battery 1 and busbar 2 simultaneously, has effectively solved near utmost point post subassembly 13 position of battery 1 and the problem of busbar 2 high temperature rise, has improved thermal safety performance. 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 air cooling and liquid cooling may be employed for the heat exchange structure 3. 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 side of the heat exchange structure 3 facing away from the battery 1 is a plane. Because heat transfer structure 3 sets up the side at a plurality of batteries 1, through the side design that deviates from batteries 1 with heat transfer structure 3 for the plane, heat transfer structure 3's surperficial uniformity is preferred, more makes things convenient for batteries 1 to be in groups, and is convenient for the assembly of other parts in battery device 100.

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.

The heat exchanging structure 3 is connected with the busbar 2 and the battery 1 through the 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 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 the battery 1 to the heat exchange structure 3 in time.

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 exchanging 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.

In one embodiment, the flange structure 14 surrounds the outer periphery of the body 11 in a plane formed by the first and second directions D1 and D2 of the battery 1.

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 view illustrating the assembly of the battery 1 with the flange structure 14 and the heat exchanging structure 3 according to the second embodiment of the present invention. A first heat-conducting glue layer 41 is arranged between the outer surface of the battery 1 and the heat exchange structure 3, and the thickness of the first heat-conducting glue 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 battery 1 and the heat exchanging structure 3, and the heat exchanging structure 3 is connected with the battery 1 through the heat conducting member 42. A second adhesive layer 43 is provided between the thermal conductor 42 and the outer surface of the battery 1, and a third adhesive layer 44 is provided between the thermal conductor 42 and the heat exchanging structure 3. The sum of the thicknesses of the second heat-conducting adhesive layer 43 and the heat-conducting member 42 is greater than or equal to the protruding height of the flange structure 14

When the protruding height of the flange structure 14 is high, for example, 2 mm or more, 3mm or more, due to the fluidity of the thermal conductive adhesive, before the thermal conductive adhesive is cured, the thermal conductive adhesive is not stably fixed between the battery 1 and the heat exchange structure 3, and under the action of gravity, the thermal conductive adhesive flows to other positions of the battery 1, so that the thermal conductive adhesive layer between the outer surface of the battery 1 and the heat exchange structure 3 cannot satisfy the protruding height of the flange structure 14 or more, and further the thermal conductive adhesive layer cannot be fully filled between the battery 1 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 battery 1, fill first heat-conducting glue layer 41 between heat-conducting piece 42 and the battery 1, 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 member 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 position of the battery 1, 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 by 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 embodiments of the present invention, 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 to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "connected" may be directly connected or indirectly connected through an intermediate. 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 describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the embodiments of the present invention.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means 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 present invention and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the embodiments of the present invention should be included in the protection scope of the embodiments of the present invention.

Claims

1. A battery device, comprising:

a plurality of batteries arranged side by side;

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

and the heat exchange structure is positioned on the same side of the battery with the bus bar and is in heat conduction connection with the battery and the bus bar.

2. The battery device of claim 1, wherein the heat exchanging structure has a first flow channel and a second flow channel inside;

along a first direction, 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.

3. The battery device of claim 2, wherein a dimension of the first flow channel is smaller than a dimension of the second flow channel along the first direction.

4. The battery device according to claim 1, wherein a surface of the heat exchanging structure facing the bus bar is provided with an insulating layer.

5. The battery device of claim 1, wherein the heat exchange structure is connected to the busbar and the cells by a thermally conductive layer.

6. The battery device of claim 1, wherein a side of the heat exchanging structure facing away from the battery is planar.

7. The battery device according to claim 1, wherein the battery comprises:

a body; and

the flange structure is convexly arranged on the body;

the heat exchange structure is in heat conduction connection with the body and the flange structure.

8. The battery device according to claim 7, wherein the side of the heat exchanging structure facing the battery is provided with a groove, and the groove accommodates at least part of the flange structure along the protruding direction of the flange structure.

9. The battery device according to claim 7, wherein a first thermal adhesive layer is arranged between the outer surface of the battery and the heat exchange structure, and the thickness of the first thermal adhesive layer is greater than or equal to the protruding height of the flange structure.

10. The battery device of claim 7, wherein a heat conducting member is disposed between the outer surface of the battery and the heat exchanging structure, and the heat exchanging structure and the battery are connected through the heat conducting member;

a second heat-conducting adhesive layer is arranged between the heat-conducting piece and the outer surface of the battery, 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 extension height of the flange structure.

11. The battery device of claim 10, wherein the thickness of the second layer of thermally conductive adhesive is less than the protrusion height of the flange structure.

12. The battery device of claim 1, wherein the heat exchanging structure comprises a liquid cooled plate.