Battery cell insulation structure and battery module

Abstract

The utility model discloses a cell insulation structure and a battery module, comprising an insulation main body, the insulation main body is provided with a first insulation surface, a second insulation surface and a third insulation surface, and the first insulation surface, the second insulation surface and the third insulation surface are mutually connected in the circumferential direction of the insulation main body; and the first insulating surface, the second insulating surface and the third insulating surface are used for abutting against and making contact with the battery cell. A battery module comprises at least two battery cell groups and a battery cell insulation structure, an insulation main body is arranged between two adjacent battery cell groups, a first insulation surface is in abutting contact with a battery cell of one battery cell group, and a second insulation surface and a third insulation surface are in abutting contact with two adjacent battery cells of the other battery cell group so as to separate the two adjacent battery cells. According to the battery module, the first insulating surface, the second insulating surface and the third insulating surface of the insulating main body respectively abut against the adjacent battery cells, so that insulation is realized, short circuit between the adjacent battery cells is prevented, and meanwhile, the internal assembly structure of the battery module can be stabilized.

Description

TECHNICAL FIELD

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

[0002] Usually in cylindrical battery module, the arrangement of electric core is that multiple electric cores are arranged in a direction to form electric core group, and then the electric core group formed by multiple electric cores is arranged in another direction, and the electric core group is separated by serpentine liquid cooling pipe between electric core group, so as to ensure the insulation between electric core and the demand of process assembly.

[0003] When arranging multiple electric core groups, if serpentine liquid cooling pipe is arranged between every two adjacent electric core groups to block the electric core group, that is, serpentine liquid cooling pipe is arranged on both sides of electric core group (see Figure 1 ), it will increase the parts inside battery module. If serpentine liquid cooling pipe is arranged between electric core group of at least two groups to block the electric core group, that is, serpentine liquid cooling pipe is arranged on one side of electric core group (see Figure 2 ), it will reduce the parts inside battery module, but the internal stability is poor, and the electric core is easy to loosen. INVENTION CONTENTS

[0004] In order to overcome at least one of the defects of the prior art, the utility model provides an electric core insulation structure and battery module, which realizes insulation by the first insulation surface, the second insulation surface and the third insulation surface of the insulation main body abutting against the adjacent electric core, prevents short circuit between adjacent electric cores and stabilizes the internal assembly structure of battery module.

[0005] The technical scheme adopted by the utility model to solve the problem is:

[0006] An electric core insulation structure includes an insulation main body, the insulation main body is provided with a first insulation surface, a second insulation surface and a third insulation surface, the first insulation surface, the second insulation surface and the third insulation surface are connected with each other in the circumferential direction of the insulation main body; the first insulation surface, the second insulation surface and the third insulation surface are used for abutting contact with the electric core to separate two adjacent electric cores.

[0007] Further, the first insulation surface, the second insulation surface and the third insulation surface are provided with positioning parts, and the positioning parts are used for positioning matching with the electric core.

[0008] Further, the positioning part is a positioning concave surface.

[0009] Further, the positioning concave surface is a circular arc surface.

[0010] Further, the maximum outer diameter of the insulating body (30) in the first direction and the second direction is 0.5mm-3.5mm.

[0011] Further, the insulating body comprises a first insulating plate, a second insulating plate and a third insulating plate, which are connected with each other in the circumferential direction of the insulating body.

[0012] Further, the first insulating plate, the second insulating plate and the third insulating plate are connected with each other in the circumferential direction of the insulating body and form a hollow structure.

[0013] Further, the two ends of the hollow structure pass through to the two end faces of the insulating body.

[0014] Further, the two ends of the hollow structure are capped with a top plate and a bottom plate.

[0015] Further, among the first insulating plate, the second insulating plate and the third insulating plate, at least one insulating plate is a hollow plate.

[0016] A battery module comprises at least two cell groups and the cell insulating structure, the cell group comprises at least two cells arranged in the first direction; at least two cell groups are arranged in the second direction; the insulating body is arranged between the adjacent two cell groups, the first insulating surface is in abutting contact with the cells of one of the cell groups, and the second insulating surface and the third insulating surface are in abutting contact with the adjacent two cells of another cell group.

[0017] In summary, the utility model has the following technical effects:

[0018] When the insulating body is assembled into the battery module, the insulating body is inserted into the adjacent cells, and since the insulating body has the first insulating surface, the second insulating surface and the third insulating surface, it can contact at least three cells in the cell module, and since the first insulating surface, the second insulating surface and the third insulating surface are connected with each other in the circumferential direction of the insulating body, the three insulating surfaces of the insulating body can be distributed in a triangular state, and after the insulating body is inserted into the battery module, it can be insulated from at least three cells of the battery module, and since the three insulating surfaces of the insulating body are distributed in a triangular state, after being insulated from the three cells, the insulating body is located between the cells, so that the cells have a spacing, and the insulating body performs physical insulation protection between the adjacent cells to prevent short circuit caused by overlapping; at the same time, the triangular abutting relationship with the cells can be formed, the assembly relationship of the cells is stable, and the positioning effect is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1A structure schematic view of one kind of battery module of prior art;

[0020] Figure 2 A structure schematic view of another kind of battery module of prior art;

[0021] Figure 3 A structure schematic view of the battery module of the utility model;

[0022] Figure 4 A structure schematic view of Figure 3 A partial enlarged structure schematic view in

[0023] Figure 5 A structure schematic view of one kind of structure of the utility model's electric core insulation structure;

[0024] Figure 6 A structure schematic view of another kind of structure of the utility model's electric core insulation structure;

[0025] Figure 7 A structure schematic view of another kind of structure of the utility model's electric core insulation structure.

[0026] Among them, the meaning of the reference sign is as follows: 10, electric core group;11, electric core;20, cooling pipe;30, insulation main body;31, first insulation plate;32, second insulation plate;33, third insulation plate;34, positioning concave surface;35, hollow structure;36, top plate;37, bottom plate. DETAILED DESCRIPTION

[0027] In order to better understand and implement, the technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model.

[0028] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0029] 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 utility model belongs. The terms used in the specification of the utility model herein are only for the purpose of describing the specific embodiments and are not intended to limit the utility model.

[0030] Reference is made to Figures 3-7The utility model discloses a kind of electric core insulation structures, including insulating body 30, the insulating body 30 is equipped with first insulating surface, second insulating surface and third insulating surface, and first insulating surface, second insulating surface and third insulating surface mutually link in the circumference of insulating body 30, when the insulating body 30 is used for battery module, first insulating surface, second insulating surface and third insulating surface can all be in abutment contact with electric core 11.

[0031] On the basis of above structure, when the electric core insulation structure of the utility model is used, the electric core insulation structure can be applied to battery module. Since the battery module is assembled by arranging multiple electric cores 11 in the first direction and the second direction, the following is described by way of example:

[0032] When the insulating body 30 is assembled into the battery module, the insulating body 30 is inserted into adjacent electric cores 11. Since the insulating body 30 has the first insulating surface, the second insulating surface and the third insulating surface, it can contact at least three electric cores 11 in the battery module. Since the first insulating surface, the second insulating surface and the third insulating surface mutually link in the circumference of the insulating body 30, the three insulating surfaces of the insulating body 30 can be distributed in a triangular state. After the insulating body 30 is inserted into the battery module, it can insulate and isolate at least three electric cores 11 of the battery module. Since the three insulating surfaces of the insulating body 30 are distributed in a triangular state, they can contact and insulate the three electric cores 11. The insulating body is located between the electric cores, so that there is a space between the electric cores. The insulating body 30 can physically insulate and protect the adjacent electric cores 11, preventing short circuit caused by overlapping. Meanwhile, the triangular abutment relationship between the insulating body and the electric cores 11 can stabilize the assembly relationship of the electric cores 11, playing a positioning role.

[0033] Specifically, if the insulating structure of the battery module is limited only in the left-right direction, the electric cores 11 are prone to displacement in the front-back direction when the battery module is extruded by external force or expands due to heat. If the insulating structure of the battery module is limited only in the front-back direction, the electric cores 11 are prone to displacement in the left-right direction. Therefore, the internal structure of the electric core module is unstable. In the present embodiment, the first insulating surface, the second insulating surface and the third insulating surface of the insulating body 30 can abut against three adjacent electric cores 11. The first insulating surface, the second insulating surface and the third insulating surface can contact and abut against the left-right adjacent electric cores 11 and the front-back adjacent electric cores 11 in the battery module. Therefore, when the battery module is extruded by external force or expands due to heat, the pressure on the electric cores 11 can be limited by the corresponding insulating surfaces, preventing displacement of the electric cores 11. This can improve the pressure resistance of the battery module, achieve multi-directional insulation and isolation, reduce the use of insulating parts and lower the cost.

[0034] It should be noted that in the embodiment, the length direction of the battery module is the first direction, and the width direction of the battery module is the second direction.

[0035] Further, the positioning portion is arranged on each of the first, second and third insulation surfaces, and can be matched with the battery cell 11. When the insulation body 30 is assembled into the battery module, the battery cell 11 is in contact with the corresponding insulation surface, and then the positioning portion can be used for positioning. The battery cell 11 can be positioned while being insulated.

[0036] It should be noted that the first, second and third insulation surfaces of the insulation body itself are triangularly distributed. When the three battery cells 11 are in contact with the insulation surfaces, the triangular distribution forms a stable battery cell 11 assembly structure. Further, the positioning portion is arranged on the corresponding insulation surface, and the positioning portion is used for positioning again. In this way, the battery cell 11 is prevented from being displaced, and the battery cell 11 assembly structure is more stable.

[0037] Specifically, the positioning portion can be selected as a positioning groove, a positioning concave surface 34 or a positioning protrusion, etc. In the embodiment, the positioning portion is the positioning concave surface 34. Therefore, when the insulation surface of the insulation body 30 is processed, the circumferential surface of the insulation body 30 is processed into a concave state to form the positioning concave surface 34 structure. When the battery cell 11 is a cylindrical battery cell 11, the positioning concave surface 34 can be selected as an arc surface matched with the circumferential surface of the cylindrical battery cell 11.

[0038] The arc surface is used to position the cylindrical battery cell 11 to adapt to the arc outer surface of the cylindrical battery cell 11. The arc formed by the arc surface can buffer the stress after the battery cell 11 is stressed. After the battery cell 11 is stressed, the stress is decomposed by the arc surface, thereby buffering the stress. In this way, the damage of the battery cell 11 after being stressed can be effectively reduced, and the battery cell 11 is effectively protected.

[0039] Of course, if the positioning portion is selected as the positioning groove, the side surface of the different battery cell 11 can also be correspondingly inserted into the positioning groove after the insulation body 30 is inserted into the battery module, so as to realize positioning. Alternatively, the positioning protrusion structure is arranged on the insulation surface of the insulation body 30, for example, the positioning protrusions are arranged on the two sides of the same insulation surface, and the positioning protrusions are abutted to the outer circumferential surface of the battery cell 11 to realize positioning. In this way, the displacement of the battery cell 11 can also be prevented.

[0040] When the square shell battery cell is used, the first, second and third insulation surfaces can be matched with the planar structure of the square shell battery cell. The insulation surfaces formed by the three planes form a triangular insulation structure, and the structure is stable. For the distribution of the three adjacent battery cells, two of the first, second and third insulation surfaces can be arranged as inclined surfaces. The positioning portion can be a positioning groove structure.

[0041] It should be noted that the insulating body 30 in the embodiment can be made of insulating materials itself, such as mica plate or aerogel, or be coated with an insulating film layer, such as polypropylene film or polyester film, on the first, second and third insulating surfaces of the insulating body 30, 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 maximum outer diameter of the insulating body 30 in the first direction and the second direction is 0.5-3.5 mm. Since the insulating body is triangular, the maximum outer diameter refers to the length of the longest side of the insulating body. After being assembled between the battery cells, the insulating distance between the adjacent two battery cells can be kept at 1-4 mm, so as to realize the insulation between the battery cells.

[0043] Further, the insulating body 30 includes the first, second and third insulating plates 31, 32 and 33, which are connected to each other in the circumferential direction of the insulating body 30. That is, the insulating body 30 can be formed by three insulating plates connected to each other in the circumferential direction, so as to form a triangular structure. The insulating body 30 can be formed by splicing the plates and connecting them by welding, bonding or buckling, which is convenient for processing.

[0044] Referring to Figure 5 The insulating body 30 includes the first, second and third insulating plates 31, 32 and 33, which are connected to each other in the circumferential direction of the insulating body 30 and form a hollow structure 35. The hollow structure 35 formed in this way can flow air. When the first, second and third insulating plates 31, 32 and 33 respectively contact different battery cells 11, the battery cells 11 will generate heat during operation. The hollow structure 35 in the middle of the insulating body 30 can flow heat, so as to realize insulation and improve the heat dissipation and insulation effect.

[0045] In addition, since the first, second and third insulating plates 31, 32 and 33 form the hollow structure 35 after being connected, the insulating body 30 formed in this way uses less material, has lower cost and lighter weight. Even after being assembled into a battery module, the battery module will not be too heavy. In addition, since the middle part is hollow, when the battery cell 11 exerts force on the corresponding insulating plate due to displacement or expansion, the hollow structure 35 inside the insulating plate can disperse the pressure to the surrounding through the structure around the hollow part after the insulating plate is pressed, so as to effectively improve the pressure resistance of the insulating plate.

[0046] Of course, the insulating surface structure can also be processed directly on different surfaces of the integrally formed insulating body 30 made of insulating glue material, which has certain deformation performance. After the insulating body 30 is inserted into different battery modules, the battery cell 11 contacts the corresponding surface, and the insulating glue itself can adapt to the structure of the battery cell 11 for positioning deformation.

[0047] In addition, based on the structure of the circular arc recesses on the first, second and third insulating surfaces, the circular arc recesses can be separately formed on the first, second and third insulating plates, or the first, second and third insulating plates can be bent to form the circular arc recess structure. The specific selection is based on actual needs.

[0048] Further, the hollow structure 35 penetrates through the two end surfaces of the insulating body 30, so that the air flow channel formed by the hollow structure 35 can penetrate through the two end surfaces of the insulating body 30, facilitating the dissipation of internal heat. After the first, second and third insulating plates 31, 32 and 33 are connected, the top end and the bottom end are both free of solid structures, so that the compression resistance is better.

[0049] Referring to Figure 6 The present embodiment also provides another insulating body structure. Among the first, second and third insulating plates 31, 32 and 33, at least one insulating plate is a hollow plate. That is, among the insulating body 30, the first insulating plate 31 can be a hollow plate, the first and second insulating plates 31 and 32 can be hollow plates, or the first, second and third insulating plates 31, 32 and 33 can all be hollow plates. In this way, the hollow plate contacts the corresponding battery cell 11 to achieve insulation, which can further improve the heat dissipation efficiency and reduce the material and weight of the insulating body 30.

[0050] Referring to Figure 7 The present embodiment also provides another insulating body structure. In the case of the hollow structure 35 of the insulating body 30, the top plate 36 and the bottom plate 37 can be provided at both ends of the hollow structure 35, which can improve the strength of the insulating body 30.

[0051] Of course, based on the structure in which one of the first, second and third insulating plates 31, 32 and 33 is a hollow plate, if the top plate 36 and the bottom plate 37 are provided at both ends of the hollow structure 35, the heat dissipation performance of the hollow structure 35 is not affected.

[0052] Embodiment 2,

[0053] Referring to Figures 3-7A battery module, comprising at least two cell groups 10 and the cell insulation structure of embodiment 1, the cell group 10 comprising at least two cells 11 arranged in a first direction; the at least two cell groups 10 are arranged in a second direction; the insulation body 30 is arranged between the adjacent two cell groups 10, the first insulation surface is in abutting contact with the cells 11 of one of the cell groups 10, and the second insulation surface and the third insulation surface are in abutting contact with the adjacent two cells 11 of the other cell group 10.

[0054] When the insulation body 30 is assembled to the battery module, the insulation body 30 is inserted into the adjacent cells 11. Since the insulation body 30 has the first insulation surface, the second insulation surface and the third insulation surface, it can contact at least three cells 11 in the cell group. Since the first insulation surface, the second insulation surface and the third insulation surface are connected to each other in the circumferential direction of the insulation body 30, the three insulation surfaces of the insulation body 30 can be distributed in a triangular state. After the insulation body 30 is inserted into the battery module, it can be insulated and separated from at least three cells 11 in the battery module. Since the three insulation surfaces of the insulation body 30 are distributed in a triangular state, the insulation body 30 can be physically insulated and protected from the adjacent cells 11 to prevent short circuit. At the same time, the triangular abutting relationship with the cells 11 can stabilize the assembly relationship of the cells 11 and play a positioning role.

[0055] Specifically, if the insulation structure of the battery module is limited only in the left-right direction, the cells 11 are prone to shift forward and backward when the battery module is subjected to external pressure or the battery module expands due to heat. If the insulation structure of the battery module is limited only in the front-rear direction, the cells 11 are prone to shift left and right. Therefore, the internal structure of the cell group 11 is unstable. In the present embodiment, the first insulation surface, the second insulation surface and the third insulation surface of the insulation body 30 can abut against the adjacent three cells 11. The first insulation surface, the second insulation surface and the third insulation surface can contact and abut against the left and right adjacent cells 11 and the front and rear adjacent cells 11 in the battery module. Therefore, when the battery module is subjected to external pressure or the battery module expands due to heat, the pressure on the cells 11 can be limited by the corresponding insulation surface to prevent the cells 11 from shifting. This can improve the pressure resistance of the battery module, achieve multi-directional insulation and separation, reduce the use of insulation parts, and reduce costs.

[0056] In the present embodiment, referring to Figure 3 The above-mentioned insulation body 30 structure can be inserted into the inner side of the two-cell group 10. A cooling plate structure can be arranged on the outer side of the two-cell group 10. For a single cell group 10, the cooling plate can be cooled on the outer side, and the insulation body 30 structure can be physically insulated and protected on the inner side to achieve heat insulation and reduce the risk of short circuit.

[0057] It should be noted that the other structure of the insulating body 30 in the embodiment is the same as that of the embodiment 1, the action principle and effect of the insulating body 30 on the battery module are the same as those of the embodiment 1, and details are not described herein.

[0058] 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 technical schemes 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, a number of 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 electrical cell insulation structure, characterized by, The insulation body (30) is provided with a first insulation surface, a second insulation surface and a third insulation surface which are connected with each other in the circumference direction of the insulation body (30); the first insulation surface, the second insulation surface and the third insulation surface are used to abut against the electric cells (11) to separate two adjacent electric cells.

2. The cell insulation structure of claim 1, wherein, The first insulation surface, the second insulation surface and the third insulation surface are provided with positioning parts which are used to positionally match with the electric cells (11).

3. The cell insulation structure of claim 2, wherein, The positioning part is a positioning concave surface (34); the positioning concave surface (34) is a circular arc surface.

4. The cell insulation structure of claim 1, wherein, The maximum outer diameter of the insulation body (30) in the first direction and the second direction is 0.5-3.5 mm.

5. The cell insulation structure according to any one of claims 1 to 4, wherein The insulation body (30) comprises a first insulation plate (31), a second insulation plate (32) and a third insulation plate (33) which are connected with each other in the circumference direction of the insulation body (30).

6. The cell insulation structure of claim 5, wherein, The first insulation plate (31), the second insulation plate (32) and the third insulation plate (33) are connected with each other in the circumference direction of the insulation body (30) and surround to form a hollow structure (35).

7. The cell insulation structure of claim 6, wherein, The two ends of the hollow structure (35) pass through to the two end surfaces of the insulation body (30).

8. The cell insulation structure of claim 6, wherein, The two ends of the hollow structure (35) are capped with a top plate (36) and a bottom plate (37).

9. The cell insulation structure of claim 5, wherein, Among the first insulation plate (31), the second insulation plate (32) and the third insulation plate (33), at least one insulation plate is a hollow plate.

10. A battery module, characterized by The application further discloses a battery comprising at least two electric cell groups (10) and the electric cell insulation structure according to any one of claims 1-9; the electric cell group (10) comprises at least two electric cells (11) arranged in the first direction; at least two electric cell groups (10) are arranged in the second direction; the insulation body (30) is arranged between two adjacent electric cell groups (10); the first insulation surface abuts against the electric cells (11) of one of the electric cell groups (10); and the second insulation surface and the third insulation surface abut against two adjacent electric cells (11) of the other electric cell group (10).

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