Insulation structure between battery cells and battery module

Abstract

The utility model discloses an insulation structure between battery cells and a battery module, which comprises an insulation body, the insulation body extends along a first direction, the insulation body is provided with a first insulation side and a second insulation side which are opposite in a second direction, the first insulation side is provided with a plurality of first insulation surfaces, and the second insulation side is provided with a plurality of second insulation surfaces. The plurality of first insulating surfaces and the plurality of second insulating surfaces are arranged in the first direction. The battery module comprises the insulation structure between the battery cells and a plurality of battery cell groups, and each battery cell group comprises a plurality of battery cells arranged in the first direction; the plurality of battery cell groups are arranged in a second direction; an insulating body is arranged between every two adjacent battery cell groups; and the first insulating surface and the second insulating surface are respectively in contact with the adjacent battery cells in the second direction. The first insulating surface and the second insulating surface which are arranged on the two sides of the insulating body simultaneously perform insulating protection on different battery cells on the two sides, so that the internal structure of the battery module is simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a kind of inter-battery cell insulation structure and battery module. BACKGROUND

[0002] Usually in cylindrical battery module, the arrangement of battery cell is that multiple battery cells are arranged in a direction to form battery cell group, and then the battery cell group formed by multiple battery cells is arranged in another direction, and the battery cell group is separated by cooling structure or insulation structure to ensure the insulation between battery cells and the requirement of process assembly.

[0003] In the existing battery module, when arranging multiple battery cell groups, a serpentine liquid cooling pipe is arranged between every two adjacent battery cell groups to block the battery cell groups, and the serpentine liquid cooling pipe is usually arranged on one side of the battery cell group (see Figure 1 ). This reduces the parts inside the battery module, but the internal stability is poor, and the battery cells are easy to loosen. In addition, the side of the battery module without the serpentine liquid cooling pipe is easy to cause the battery cells to be short-circuited during assembly, which is risky. SUMMARY

[0004] In order to overcome at least one of the defects of the prior art described above, the utility model provides an inter-battery cell insulation structure and a battery module, which has first and second insulation surfaces arranged on both sides of the insulation body to simultaneously insulate and protect different battery cells, simplifying the internal structure of the battery module.

[0005] The utility model adopts the technical scheme to solve the problem:

[0006] An inter-battery cell insulation structure includes an insulation body, the insulation body extends in a first direction, the insulation body has a first insulation side and a second insulation side opposite in a second direction, the first insulation side is provided with a plurality of first insulation surfaces, the second insulation side is provided with a plurality of second insulation surfaces, and the plurality of first insulation surfaces and the plurality of second insulation surfaces are arranged in the first direction.

[0007] Further, the first insulation side is provided with a first recessed position recessed towards the second insulation side, and the first insulation surface is arranged in the first recessed position.

[0008] Further, the second insulation side is provided with a second recessed position recessed towards the first insulation side.

[0009] Further, the first recessed position is a first circular arc recessed position, and the second recessed position is a second circular arc recessed position; the first circular arc recessed position and the second circular arc recessed position share a circular arc wall.

[0010] Further, the first insulation surface and the second insulation surface are staggered in the first direction.

[0011] Further, the first insulation surface and the second insulation surface are provided with an insulation material layer.

[0012] Further, the thickness of the insulation body in the second direction is 3-3.6mm.

[0013] A battery module comprising the inter-battery insulation structure and a plurality of battery cell groups, the battery cell groups comprising a plurality of battery cells arranged in the first direction; the battery cell groups are arranged in the second direction; the insulation body is arranged between two adjacent battery cell groups; the first insulation surface and the second insulation surface are in contact with the adjacent battery cells in the second direction, respectively.

[0014] Further, the battery module further comprises a heat exchange member, the heat exchange member extends along the first direction; the same battery cell group is provided with the heat exchange member and the insulation body on both sides in the second direction.

[0015] Further, the heat exchange member is provided with a first heat exchange side and a second heat exchange side in the second direction, the first heat exchange side and the second heat exchange side are provided with a circular arc heat exchange surface corresponding to the first insulation surface and the second insulation surface.

[0016] In summary, the utility model has the following technical effects:

[0017] The insulation body can be inserted into the battery module, after the same insulation body is inserted into the battery module, the insulation body can be insulated and separated from a plurality of battery cells in the first direction, and can be insulated and separated from two adjacent battery cells in the second direction, so that the insulation protection effect is achieved, and the internal lap joint short circuit of the battery module is prevented; meanwhile, the plurality of battery cells of the battery cell group can be positioned, and the internal loosening of the battery cell group is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structural schematic view of the battery module in the prior art;

[0019] Figure 2 It is a structural schematic view of the battery module of the utility model;

[0020] Figure 3 It is a structural schematic view of the insulation body of the utility model.

[0021] Among them, the meaning of the reference signs is as follows: 10, battery cell group; 11, battery cell; 20, heat exchange member; 21, circular arc heat exchange surface; 30, insulation body; 31, first insulation surface; 32, second insulation surface. DETAILED DESCRIPTION

[0022] In order to better understand and implement, the technical solutions in the embodiments of the present application will be clearly and completely described in the following with reference to the drawings in the embodiments of the present application.

[0023] In the description of the present application, it should be pointed out that the directions or position relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the directions or position relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the devices or elements indicated to have a specific direction, to be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0025] Embodiment 1,

[0026] Referring to Figure 2 and Figure 3 The present application discloses an inter-battery cell insulation structure, comprising an insulation body 30, the insulation body 30 extends along a first direction, and the insulation body 30 has a first insulation side and a second insulation side opposite in a second direction. Specifically, a plurality of first insulation surfaces 31 are provided on the first insulation side, and a plurality of second insulation surfaces 32 are provided on the second insulation side. The plurality of first insulation surfaces 31 and the plurality of second insulation surfaces 32 are arranged in the first direction.

[0027] Based on the above structure, when the inter-battery cell insulation structure of the present application is used, the battery cell insulation structure can be applied to a battery module. Since the battery module is assembled by arranging a plurality of battery cells 11 in the first direction and the second direction, for example, a plurality of battery cells 11 are arranged in the first direction, and a plurality of battery cells 11 are arranged in the second direction.

[0028] When the insulating body 30 is assembled to the battery module, since the insulating body 30 extends in the first direction, the insulating body 30 can be distributed in the first direction of the battery module, and thus the first insulating surfaces 31 of the first insulating side of the insulating body 30 can correspondingly contact and abut against the plurality of battery cells 11 arranged in the first direction, and the second insulating surfaces 32 of the second insulating side of the insulating body 30 can also correspondingly contact and abut against the plurality of battery cells 11 arranged in the first direction. At the same time, the adjacent battery cells 11 in the second direction can correspondingly contact the first insulating surfaces 31 and the second insulating surfaces 32 to achieve insulation and blocking. In this way, after the same insulating body 30 is inserted into the battery module, insulation and blocking can be achieved between the plurality of battery cells 11 in the first direction, and insulation and blocking can also be achieved between the adjacent two battery cells 11 in the second direction, thereby achieving the effect of insulation and protection, and preventing the internal lap joint short circuit of the battery module.

[0029] For example, when the battery module is arranged with a plurality of battery cell groups 10 in the second direction, and each battery cell group 10 is arranged with a plurality of battery cells 11 in the first direction, the insulating body 30 can be arranged on both sides of the same battery cell group 10 in the second direction. The plurality of first insulating surfaces 31 of the first insulating side of the insulating body 30 can insulate and block the plurality of battery cells 11 of the adjacent battery cell group 10, and the plurality of second insulating surfaces 32 of the second insulating side of the insulating body 30 can insulate and block the plurality of battery cells 11 of the other adjacent battery cell group 10. The heat exchange member 20 can be arranged outside the outermost battery cell group 10, that is, the outer battery cell group 10 of the same battery module can guide the heat exchange fluid to exchange heat through the heat exchange member 20, and the two battery cell groups 10 in the middle of the battery module can be insulated and blocked by the insulating body 30 to achieve the effect of insulation and protection. In addition, the battery cell group 10 in the middle position can also be positioned to prevent the battery cell group 10 from loosening, thereby stabilizing the structure of the battery module.

[0030] For another example, when the battery module is arranged with a plurality of battery cell groups 10 in the second direction, the insulating body 30 can be arranged on one side of the same battery cell group 10 in the second direction, and the heat exchange member 20 can be arranged on the other side. That is, after the battery module is assembled, the insulating body 30 is arranged on one side to achieve insulation and blocking, and the heat exchange member 20 is arranged on the other side to achieve heat exchange, thereby improving the use performance of the battery.

[0031] Compared with the prior art, the insulating body 30 is arranged on one side of the same battery cell group 10 to achieve insulation and protection on one side of the battery cell group 10, and the heat exchange member 20 is arranged on the other side to achieve single-sided heat exchange on the other side, thereby stabilizing the use performance of the battery module, and the cost is lower.

[0032] It should be noted that the first direction and the second direction in the embodiment can be the length direction and the width direction of the battery module.

[0033] In the embodiment, the first insulation side can be provided with a first recessed position recessed towards the second insulation side, and the first insulation surface 31 is arranged in the first recessed position. When the insulation body 30 is inserted between the cell groups 10 of the battery module, in the second direction, the first recessed position of the first insulation side is used for the partial outer surface of the cell 11 to be recessed, and the first insulation surface 31 of the first recessed position is used for insulation blocking. The cell 11 can be in insulated contact with the corresponding first insulation surface 31 to achieve the insulation protection effect, and the cell 11 can also be positioned by the recessed part of the first recessed position to prevent the cell 11 from being displaced in the first direction. Thus, the cell 11 can be positioned while being insulated, and the cell loosening in the battery module can be reduced.

[0034] Similarly, the second insulation side is provided with a second recessed position recessed towards the first insulation side. In the second direction, the second recessed position of the second insulation side is used for the partial outer surface of the cell 11 to be recessed, and the second insulation surface 32 of the second recessed position is used for insulation blocking. The cell 11 can be in insulated contact with the corresponding second insulation surface 32 to achieve the insulation protection effect, and the cell 11 can also be positioned by the recessed part of the second recessed position to prevent the cell 11 from being displaced in the first direction. Thus, the cell 11 can be positioned while being insulated.

[0035] That is, the first recessed position and the second recessed position are arranged on the insulation body 30, and the inner wall surface of the first recessed position and the second recessed position is formed as the first insulation surface 31 and the second insulation surface 32. Thus, after the insulation body 30 is assembled to the battery module, the recessed position structure is in contact with the cell 11 to achieve insulation blocking.

[0036] Of course, the insulation body 30 can also be provided with protruding insulation glue, and the insulation glue is in contact with the outer surface of the cell 11 to achieve insulation blocking. The insulation glue is in contact with the cell 11 to be deformed to form a corresponding insulation surface, and the same insulation blocking can also be achieved. Thus, the first insulation surface and the second insulation surface can be formed on the insulation glue.

[0037] Further, the first recessed position is a first circular arc recessed position, and the second recessed position is a second circular arc recessed position. The first circular arc recessed position and the second circular arc recessed position share a circular arc wall. Thus, the structure of the insulation body 30 formed is in a wave shape or a snake shape. The circular arc surface is selected to position the cylindrical cell 11 to adapt to the circular arc outer surface. The circular arc formed by the circular arc surface can buffer the stress after the cell 11 is stressed. After the cell 11 is stressed, the stress surface is a circular arc surface, which can decompose the single-point stress to buffer the stress. Thus, the cell 11 can be effectively prevented from being damaged after being stressed, and the cell 11 can be effectively protected.

[0038] And when the square shell battery cell 11 is used, the first recess and the second recess can match the planar structure of the square shell battery cell 11, so that the square shell battery cell 11 can be directly embedded in the planar recess structure. It can also be used as an insulating barrier with the outer surface of the battery cell 11 by setting the intersecting inclined surface structure on the first insulating side or the second insulating side, and positioning can also be achieved.

[0039] Further, the first insulating surface 31 and the second insulating surface 32 are staggered in the first direction, that is, on the projection of the insulating body 30 in the first direction, one second insulating surface 32 is distributed between two adjacent first insulating surfaces 31, so that in the battery module, one of the battery cells 11 of an adjacent battery cell group 10 is distributed between two battery cells 11 of another adjacent battery cell group 10 in the second direction. After the insulating body 30 is inserted, for the distribution of three adjacent batteries, one first insulating surface 31 cooperates with two second insulating surfaces 32 to respectively insulate and abut against the three battery cells 11, so that the distribution structure of the battery cells 11 in the battery module is compact and not prone to looseness.

[0040] Of course, the first insulating surface and the second insulating surface on both sides of the above-mentioned insulating body can also be one-to-one correspondence, which can be selected and set according to the distribution of the battery cells of the adjacent battery cell groups of the battery module.

[0041] It should be noted that the insulating body 30 in the embodiment can be made of an insulating material itself, such as mica plate or aerogel, or an insulating material layer can be provided on the first insulating surface 31 and the second insulating surface 32 of the insulating body 30, such as polypropylene film and polyester film, so as to form a material with effective insulation and heat insulation performance, which can effectively prevent the battery module from leaking and short circuiting.

[0042] Further, the thickness of the insulating body in the second direction in the embodiment is 3-3.6mm, that is, the insulating spacing between two adjacent battery cells in the second direction is maintained at about 4mm. And the thickness of the heat exchange member between the battery cell groups in the prior art is also generally 3-3.6mm, so that the thickness of the insulating body and the heat exchange member is relatively consistent, and the stability is better after assembly.

[0043] Embodiment 2,

[0044] Referring to Figure 2 and Figure 3 A battery module includes the inter-battery cell insulating structure of Embodiment 1 and a plurality of battery cell groups 10, the battery cell group 10 includes a plurality of battery cells 11 arranged in the first direction; a plurality of battery cell groups 10 are arranged in the second direction; the insulating body 30 is arranged between two adjacent battery cell groups 10; the first insulating surface 31 and the second insulating surface 32 respectively contact the adjacent battery cells 11 in the second direction.

[0045] When the battery module is assembled, the plurality of battery cells 11 are arranged in the first direction and the second direction. The plurality of battery cells 11 are arranged in the first direction and the second direction. The insulating body 30 is assembled to the battery module. Since the insulating body 30 extends in the first direction, the insulating body 30 can be distributed in the first direction of the battery module. Therefore, the first insulating surfaces 31 of the first insulating side of the insulating body 30 can correspondingly contact and abut against the plurality of battery cells 11 arranged in the first direction one by one. The second insulating surfaces 32 of the second insulating side of the insulating body 30 can also correspondingly contact and abut against the plurality of battery cells 11 arranged in the first direction one by one. At the same time, the adjacent battery cells 11 in the second direction can correspondingly contact the first insulating surfaces 31 and the second insulating surfaces 32 to insulate and block. After the same insulating body 30 is inserted into the battery module, the plurality of battery cells 11 in the first direction can be insulated and blocked, and the adjacent two battery cells 11 in the second direction can be insulated and blocked. Therefore, the insulating body 30 can play a role in insulating and protecting the battery module from short circuit.

[0046] In the embodiment, the battery module further comprises a heat exchange member 20. Similarly, the heat exchange member 20 extends in the first direction, that is, in the same direction as the insulating body 30. The same battery cell group 10 is provided with the heat exchange member 20 and the insulating body 30 on both sides in the second direction. The battery module arranges a plurality of battery cell groups 10 in the second direction. The insulating body 30 is arranged on one side of the same battery cell group 10 in the second direction, and the heat exchange member 20 is arranged on the other side. That is, after the battery module is assembled, the insulating body 30 is arranged on one side to insulate and block, and the heat exchange member 20 is arranged on one side to exchange heat, thereby improving the performance of the battery.

[0047] Compared with the prior art, the heat exchange member 20 is arranged on one side of the same battery cell group 10 to insulate and protect the battery cell group 10, and the heat exchange member 20 is arranged on the other side to solve the problem of single-sided heat exchange and stabilize the performance of the battery module. Therefore, the cost is lower.

[0048] Further, the heat exchange member 20 is provided with a first heat exchange side and a second heat exchange side in the second direction. The first heat exchange side and the second heat exchange side are provided with arc heat exchange surfaces 21 corresponding to the first insulating surfaces 31 and the second insulating surfaces 32. That is, the heat exchange member 20 can also be a wave-shaped or serpentine heat exchange pipe. After the heat exchange member is assembled with the battery module, the arc heat exchange surfaces of the heat exchange member can contact the outer surface of the battery cell to exchange heat. The arc heat exchange surfaces can match the arc outer surface of the cylindrical battery cell. Therefore, the fit is better, and the heat exchange efficiency is higher.

[0049] Specifically, the heat exchange member 20 is a liquid cooling pipe, and the battery module is cooled by introducing a cooling fluid into the liquid cooling pipe. In the single-sided liquid-cooled cylindrical battery module, one side of the liquid cooling pipe is not used, and the single side of the battery cell group 10 is cooled and insulated. The other side of the battery cell group 10 is provided with an insulating body 30 as an insulating protective material. Since the liquid cooling pipe needs to be machined, the cost of machining the liquid cooling pipe in a wave shape or a serpentine shape is higher than that of the insulating body 30 in a wave shape or a serpentine shape. Therefore, in this embodiment, the single-sided liquid cooling pipe is matched with the other side of the insulating body 30, which can solve the single-sided liquid-cooled battery module and realize the insulation of the battery cell 11, and effectively reduce the cost.

[0050] It should be noted that the other structure of the insulating body 30 in this embodiment is the same as that of embodiment 1, and the working principle and effect of the battery module are the same as those of embodiment 1, which will not be described in detail.

[0051] The technical means disclosed in the utility model scheme is not limited to the technical means disclosed in the above-mentioned embodiments, and also includes the technical scheme composed of any combination of the above technical features. It should be noted that for ordinary skilled persons in the art, without departing from the principles of the utility model, some improvements and refinements can be made, and these improvements and refinements are also considered within the protection scope of the utility model.

Claims

1. An inter-cell insulation structure, characterized in that, Includes an insulating body (30) extending along a first direction. The insulating body (30) has a first insulating side and a second insulating side opposite to each other in a second direction. The first insulating side is provided with a plurality of first insulating surfaces (31), and the second insulating side is provided with a plurality of second insulating surfaces (32). The plurality of first insulating surfaces (31) and the plurality of second insulating surfaces (32) are all arranged in the first direction.

2. The cell-to-cell insulation structure according to claim 1, characterized in that, The first insulating side is provided with a first recessed part that is recessed toward the second insulating side, and the first insulating surface (31) is provided in the first recessed part.

3. The cell-to-cell insulation structure according to claim 2, characterized in that, The second insulating side is provided with a second recess that is recessed toward the first insulating side.

4. The cell-to-cell insulation structure according to claim 3, characterized in that, The first recess is a first arc recess, and the second recess is a second arc recess; the first arc recess and the second arc recess share a single arc wall.

5. The cell-to-cell insulation structure according to claim 1, characterized in that, The first insulating surface (31) and the second insulating surface (32) are staggered in the first direction.

6. The cell-to-cell insulation structure according to any one of claims 1-5, characterized in that, Both the first insulating surface (31) and the second insulating surface (32) are provided with an insulating material layer.

7. The cell-to-cell insulation structure according to any one of claims 1-5, characterized in that, The thickness of the insulating body (30) in the second direction is 3mm-3.6mm.

8. A battery module, characterized in that, The device includes an inter-cell insulation structure according to any one of claims 1-5 and a plurality of cell groups (10), wherein the cell group (10) includes a plurality of cells (11) arranged in the first direction; the plurality of cell groups (10) are arranged in the second direction; the insulating body (30) is provided between two adjacent cell groups (10); the first insulating surface (31) and the second insulating surface (32) are respectively in contact with the adjacent cell (11) in the second direction.

9. The battery module according to claim 8, characterized in that, The battery module also includes a heat exchanger (20) that extends along the first direction; the same cell group (10) is provided with the heat exchanger (20) and the insulating body (30) on both sides of the second direction.

10. The battery module according to claim 9, characterized in that, The heat exchanger (20) is provided with a first heat exchange side and a second heat exchange side in the second direction. Both the first heat exchange side and the second heat exchange side are provided with arc heat exchange surfaces (21) corresponding to the first insulating surface (31) and the second insulating surface (32).

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