CN219350414U

CN219350414U - Heat insulation structure for battery cell module

Info

Publication number: CN219350414U
Application number: CN202223443817.5U
Authority: CN
Inventors: 彭嘉迁; 黄锡运; 章驰威; 杨坤; 郭鹏; 童成操; 向灵
Original assignee: Jiangsu Yaoning New Energy Innovation Technology Co ltd
Current assignee: Jiangsu Yaoning New Energy Innovation Technology Co ltd
Priority date: 2022-12-22
Filing date: 2022-12-22
Publication date: 2023-07-14
Anticipated expiration: 2032-12-22

Abstract

The utility model provides a heat insulation structure for a battery cell module, which comprises a first battery cell and a second battery cell, wherein the heat insulation structure is arranged between the first battery cell and the second battery cell and comprises a first silica gel piece with a first cavity, a gel piece with a second cavity and a second silica gel piece for heat insulation. The first silica gel piece, the glue piece and the second silica gel piece are respectively stuck on the opposite inner sides of the first battery cell and the second battery cell, and the glue piece is covered around the second silica gel piece, so that the second silica gel piece is embedded in the second cavity; the first silica gel piece covers around the glue piece, so that the first silica gel piece is embedded in the first cavity. The utility model adopts a three-layer nested structure formed by combining a silica gel sheet, a battery cell structural adhesive and a heat insulation silica gel sheet to solve the problem that the prior art cannot adapt to the breath of a battery cell; meanwhile, the double-sided adhesive tape is adopted between the heat insulation structure and the battery cells, so that the stability between the battery cells is enhanced, and the battery cells in the box body cannot shift after the vehicle collides.

Description

Heat insulation structure for battery cell module

Technical Field

The present disclosure relates to heat insulation, and particularly to a heat insulation structure for a battery module.

Background

The lithium ion battery has the advantages of light weight, low cost, high capacity, long cycle life and the like, and is widely applied to various fields of new energy automobiles, aerospace and the like. With the increasing energy density of batteries, the risk of thermal runaway presents an increasing trend. When a certain cell in the battery module is out of control, a large amount of heat is released; when heat is transferred to the adjacent cells, thermal runaway can propagate and form a chain reaction, resulting in a great potential safety hazard. If the thermal runaway speed of the battery module of the electric vehicle is too high, people cannot get away, and safety cannot be guaranteed.

In the technical field of new energy, a plurality of electric cores are arranged together to form an electric core bundle to supply energy together, and a heat-insulating, insulating and fireproof protection device is usually arranged between adjacent electric cores. Because of the expansion and contraction of the cells to some extent during operation, the so-called cell breathing effect. When the cells are circularly charged and discharged to expand, the spacers are difficult to ensure that the stress of each position between the two cells is uniform. Therefore, the battery cell is easy to deform when expanding, the electric performance of the battery cell can be influenced, the service life of the battery is influenced, and the spacer is extruded by the expansion of the battery cell, so that the heat insulation performance is poor, and therefore, heat insulation buffer cushions are required to be arranged between the battery cells.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present utility model is to provide a heat insulation structure for a battery cell module, which is used for solving the problem that the heat insulation structure is difficult to adapt to the breath of the battery cell in the charging and discharging process of the battery cell in the prior art, and is beneficial to solving the problem of light weight of the battery cell structure.

To achieve the above and other related objects, the present utility model provides a heat insulating structure for a cell module, the cell module including a first cell and a second cell,

the heat insulation structure is arranged between the first electric core and the second electric core and comprises a first silica gel piece with a first cavity, a second silica gel piece with a second cavity and a second silica gel piece for heat insulation;

the first silica gel piece, the second silica gel piece and the second silica gel piece are respectively stuck on the inner side surfaces of the first battery cell and the second battery cell, and the second silica gel piece is covered around the second silica gel piece, so that the second silica gel piece is embedded in the second cavity;

the first silica gel piece is arranged around the rubber piece in a covering mode, so that the first silica gel piece is embedded in the first cavity.

In an embodiment of the utility model, the second silica gel piece is a thermal insulation silica gel piece, and foamed silica gel materials are adopted, and two sides of the second silica gel piece are respectively provided with double-sided back glue, so that the second silica gel piece is fixedly connected with the opposite inner side surfaces of the first battery cell and the second battery cell respectively.

In an embodiment of the utility model, the glue piece is a structural glue with heat conduction performance, a lower end of the structural glue is in contact with an upper end of the second silica gel piece, and an upper end of the glue piece is in contact with a lower end of the first silica gel piece.

In an embodiment of the utility model, the first silica gel piece is a hard silica gel piece with wear resistance, and two sides of the first silica gel piece are respectively provided with double-sided back glue, so that the first silica gel piece is fixedly connected with the opposite inner side surfaces of the first battery cell and the second battery cell respectively.

In an embodiment of the present utility model, the thickness of the first silica gel piece, the thickness of the second silica gel piece, and the thickness of the second silica gel piece are all equal, and when the first silica gel piece, the thickness of the second silica gel piece, the thickness of the first silica gel piece, the thickness of the second silica gel piece, and the thickness of the first silica gel piece are adhered to the inner sides of the first battery cell and the second battery cell, which are opposite to each other, the first battery cell and the second battery cell are arranged in parallel, and the first silica gel piece, the second silica gel piece, and the first silica gel piece are located on the same plane.

In an embodiment of the present utility model, the cell module is disposed in a box, and the box includes a longitudinal beam, a fixed steel plate, and a side protection plate.

In an embodiment of the utility model, the longitudinal beam is a longitudinal beam bracket integrally formed by the box body from bottom to top, and the fixed steel plate is fixedly connected with the longitudinal beam and compresses the battery cell module.

In an embodiment of the present utility model, the side protection plates are disposed perpendicular to the stringers and fixedly connected to the fixed steel plates, so that the side protection plates provide a fixed support for a plurality of the battery cells stacked side by side in the Y-axis direction of the battery cell module.

In an embodiment of the present utility model, the bottom of the battery cell module is fixedly connected to the bottom inner side of the case body, so as to cooperate with the fixed steel plate, so that a plurality of battery cell modules stacked side by side are fixed in the Z-axis direction of the case body.

In an embodiment of the present utility model, the heat insulation structure is disposed at one side of the first electric core, and the first electric core is fixedly connected with the longitudinal beam through the heat insulation structure, so that a plurality of electric core modules stacked side by side are fixedly connected with the box body in the X-axis direction.

As described above, the heat insulation structure for the battery cell module of the present utility model has the following beneficial effects:

the second silica gel piece of the innermost layer of the three-layer structure of the battery cell adopts foaming silica gel, has excellent high and low temperature resistance and lower heat conductivity coefficient, and can also make a certain contribution in the aspect of realizing the light weight of the whole battery; the middle cell structure adhesive adopts a double-component polyurethane structure adhesive, has high elasticity and excellent bonding strength, and can meet the respiratory effect between cells; the hardness of the hard silica gel adopted by the silica gel sheet at the outermost layer reaches 60HA of Shore hardness, and the effect of size limitation is mainly achieved. When the battery cell is circularly charged and discharged to expand, the heat insulation structure can restrict the battery cell, so that the battery cell can be uniformly stressed, the performance of the battery cell is favorably exerted, the service life of the battery cell is prolonged, the heat insulation body between the battery cells can be prevented from being extruded, and the heat insulation performance is effectively ensured.

Drawings

Fig. 1 is a schematic structural view of a heat insulation structure for a battery cell module according to the present utility model.

Fig. 2 is a schematic perspective view of an insulation structure for a cell module and a cell module according to the present utility model.

Fig. 3 is an exploded view of an insulating structure for a cell module according to the present utility model.

Fig. 4 is a schematic diagram showing the assembly relationship among the heat insulation structure, the cell module and the case of the present utility model.

Description of element reference numerals

The battery cell module 1, the first battery cell 11 and the second battery cell 12;

the heat insulation structure 2, the first silica gel piece 21, the first silica gel piece first surface 211, the first silica gel piece second surface 212, the glue piece 22, the glue piece first surface 221, the glue piece second surface 222, the second silica gel piece 23, the second silica gel piece first surface 231, the second silica gel piece second surface 232, the first cavity 24 and the second cavity 25;

the box 3, the longitudinal beam 31, the fixed steel plate 32 and the side protection plate 33.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. It is also to be understood that the terminology used in the examples of the utility model is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the utility model. The test methods in the following examples, in which specific conditions are not noted, are generally conducted under conventional conditions or under conditions recommended by the respective manufacturers.

Please refer to fig. 1 to 4. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the utility model, are not intended to be critical to the essential characteristics of the utility model, but are intended to fall within the spirit and scope of the utility model. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.

Referring to fig. 1 and 2, the present utility model provides a heat insulation structure of a battery cell module, wherein the battery cell module 1 includes a first battery cell 11 and a second battery cell 11, the heat insulation structure 2 is disposed between the first battery cell 11 and the second battery cell 12, and the heat insulation structure 2 includes a first silica gel member 21 having a first cavity 24, a second silica gel member 22 having a second cavity 25, and a second silica gel member 23 for heat insulation. The first silica gel piece 21, the glue piece 22 and the second silica gel piece 23 are respectively adhered to opposite inner sides of the first battery cell 11 and the second battery cell 12, and the glue piece 22 is covered around the second silica gel piece 23, so that the second silica gel piece 23 is embedded in the second cavity 25. The first silicone member 21 is disposed around the glue member 22, so that the first silicone member 21 is embedded in the first cavity 24.

As can be seen in FIG. 3, the second silica gel member 23 is a heat-insulating silica gel sheet made of foamed silica gel, has high and low temperature resistance and low heat conductivity, and has a density of usually only 0.3-0.7 g/cm ³ Compression permanent deformation is less than 5%, water absorption is less than or equal to 5%, and long-term temperature resistance is between-40 ℃ and +100 ℃. According to the characteristics, the electric core expansion device can adapt to the expansion of the electric core, reduces the stress between the electric core and the electric core heat insulation pad, and can prevent the adjacent electric cores from contacting, thereby effectively ensuring the insulation safety between the adjacent electric cores. Two sides of the second silica gel piece 23 are respectively provided with double-sided back adhesive, so that the second silica gel piece 23 is fixedly connected with the inner side surfaces of the first battery cell 11 and the second battery cell 12 which are opposite. The first silica gel piece 21 is a hard silica gel piece with wear resistance, and HAs hardness up to 60HA on shore, and excellent voltage-resistant and insulating properties. The two sides of the first silica gel piece 21 are respectively provided with double-sided back adhesive, so that the first silica gel piece 21 is fixedly connected with the inner side surfaces of the first battery cell 11 and the second battery cell 12, which are opposite. The glue piece 22 is a structural glue with heat conduction performance, the lower end of the glue piece is contacted with the upper end of the second silicon piece 23, and the upper end of the glue piece 22 is contacted with the lower end of the first silicon piece 21. The arrangement of the cell structural adhesive can realize the fixation of adjacent cells, and simultaneously fixes the silica gel sheet and the heat-insulating silica gel sheet, thereby replacing the mechanical connection in the original module structure. The gel 22 may be a polyisocyanate or polyether polyol having a shear strength of 12MPa or more. When the battery cell breathes to carry out charge and discharge heat release, lithium ions bring expansion and contraction of crystal lattices inside the material in the process of embedding and escaping positive and negative electrode materials, so that the battery cell expands and contracts. After the battery is expanded due to the insertion of lithium ions, the volume of the expanded battery can rebound due to the resilience force of the structural adhesive in the engineering of lithium ion escape, so that the respiration of the battery core is realized. The middle of the heat insulation structure is provided with structural adhesive, which is usually liquid, and in an unconstrained or hindered state, the battery cell is charged and discharged to expand, so that the structural adhesive overflows to the surface of the battery cell, and therefore, the heat insulation structure needs to be arranged between the first silica gel piece 21 and the second silica gel piece 23, so that the heat insulation structure fully plays a role. As same asWhen the first silica gel piece 21, the second silica gel piece 22 and the second silica gel piece 23 have equal thickness, after being adhered to opposite inner sides of the first battery cell 11 and the second battery cell 12, the first battery cell 11 and the second battery cell 12 are arranged in parallel, and the first silica gel piece 21, the second silica gel piece 22 and the second silica gel piece 23 are all positioned on the same plane. The double-sided back adhesive is usually made of polyurethane, the shearing strength of the double-sided back adhesive can reach 15MPa, and the drawing strength of the double-sided back adhesive can reach 17MPa.

As can be seen in connection with fig. 4, several cell modules 1 are stacked side by side and fixedly arranged in a housing 3. The case 3 includes a side member 31, a fixed steel plate 32, and a side shield 33. The stringers 31 are stringer holders integrally formed from the bottom of the box body 3, and may be made of aluminum alloy or other suitable materials. And heat dissipation holes are also formed at proper positions on the periphery of the box body. The fixed steel plate 32 is a strip steel plate structure, is fixedly connected with the longitudinal beam 31, and realizes the compression of the cell module 1. The bottoms of the plurality of cell modules 1 stacked side by side are fixedly connected with the inner side surface of the bottom of the box body 3 to be matched with the fixed steel plate 32, so that the plurality of cell modules 1 stacked side by side are fixed in the Z-axis direction of the box body 3. The bottom and top of the plurality of battery cell modules 1 stacked side by side and the box body 3 and the fixed steel plate 32 may be fixed by adopting the aforementioned structural adhesive, or may be fixed in other suitable manners. The cell modules 1 can conduct heat generated during charging and discharging by contacting with the box body 3 and the fixed steel plates 32. The two sides of the plurality of cell modules 1 stacked side by side are also respectively provided with side protection plates 33, and the side protection plates 33 are arranged perpendicular to the stringers 31 and fixedly connected with the fixed steel plates 32, so that the side protection plates 33 can provide fixed support for the plurality of cell modules 1 stacked side by side in the Y-axis direction. The fixing mode can be a fastener or other suitable fixing modes. The side protection plate can be polypropylene resin or other suitable materials.

In a preferred embodiment of the present utility model, referring to fig. 3 and 4, at least one group of several cells 1 stacked side by side is provided inside the case 3. Each cell module 1 comprises a first cell 11 and a second cell 12. Wherein, the side of the first electric core 11 of the electric core module 1 of a plurality of electric core modules 1 that stack side by side, the electric core module 1 of the outer position of both sides is equipped with thermal insulation structure 2, and one side of first electric core 11 is through three-layer nested thermal insulation structure 2 and longeron 31 fixed connection for a plurality of electric core modules 1 of stacking side by side are in X axle direction and box 3 fixed connection. In each cell module 1, the opposite inner sides of the first cell 11 and the second cell 12 are also fixedly connected through double-sided back glue of the heat insulation structure 2. The inner side surface of the first battery core 11 is fixed with the first silica gel piece first surface 211, the glue piece first surface 221 and the first silica gel piece first surface 231 by double faced adhesive tape respectively; the inner side of the second battery core 12 is fixed with the first silica gel piece second surface 212, the glue piece 222 and the second silica gel piece second surface 232 by double-sided glue, so as to realize the fixed connection of the opposite inner sides of the first battery core 11 and the second battery core 12. In the plurality of cell modules 1 stacked side by side, the heat insulation structure 2 of the utility model is also arranged between two adjacent cell modules 1, and the cells at adjacent positions in the two adjacent cell modules 1 are pasted through the heat insulation structure 2. The bottom of the battery cell module 1 is fixedly connected with the box body 3 through structural adhesive, and heat of battery cell charging and discharging can be exchanged with the box body through the structural adhesive. The side protection plates 33 are symmetrically arranged in the Y-axis direction of the battery cell module 1, and the battery cell module 1 is fixedly connected with the side protection plates 33 through double-sided adhesive tape. A fixed steel plate 32 is arranged at the upper part of the cell module 1 and fixedly connected through double-sided back glue. The fixed steel plate 32 is fixedly connected with the longitudinal beam 31 through a fastener, and the side protection plate 33 is also provided with a threaded hole, and the fixed steel plate 32 is fixedly connected with the side protection plate 33 through the fastener. So that the battery cell module 1 is fixed in the box body 3 in multiple dimensions by being fixedly connected with the box body 3, the fixed steel plate 32 and the side protection plate 33 respectively.

The three-layer nested heat insulation structure changes the mechanical connection mode in the prior art, achieves the effects of insulation, heat dissipation and the like between the electric cores, and simultaneously enhances the fixing mode between the electric cores. The hard silica gel sheet is arranged on the outermost layer of the heat insulation structure, and the heat insulation structure is not easily damaged due to the wear resistance and heat conduction characteristics. The cell structural adhesive is a double-component polyurethane structural adhesive, and realizes heat dissipation and respiration of the cell on the basis of meeting the bonding strength between the silica gel sheet and the heat insulation silica gel sheet. The heat insulation silica gel sheet is arranged on the inner side of the battery cell heat insulation structure, foamed silica gel is adopted, and the battery cell is light-weighted on the basis of guaranteeing the heat dissipation performance of the battery cell. The three-layer structure is connected, and meanwhile, the functions of adapting to the respiration of the battery cell, insulating heat, fixing and the like are achieved. Through the design of the heat insulation structure, high-temperature hot gas sprayed out when the single battery cell is out of control can be effectively insulated, so that the high-temperature gas is prevented from being transmitted to other battery cells, and the thermal control of the whole battery pack is caused. And the silica gel sheet and the heat insulation silica gel sheet have high elasticity, and can effectively absorb expansion of the battery cell in the process of multiple charging and discharging, so that the battery cell module is not deformed.

In summary, the three-layer heat insulation structure adopts the high-elasticity material outside, and freely stretches and contracts in cooperation with the respiration of the battery cell, so that the life cycle of the battery cell is improved; the inside of the plastic is provided with the low-density foaming silica gel, which is more beneficial to light weight. By combining materials with individual characteristics, the range of applicability of the structure is increased. Meanwhile, the middle cell structure adhesive ensures that the bonding strength of the inner and outer materials is high, so that collision between the cells is avoided when the automobile collides, and the materials for fastening the cells are also saved. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model, and it is intended that the appended claims be interpreted as covering all equivalent modifications and variations as fall within the true spirit and scope of the utility model.

Claims

1. A thermal insulation structure for a cell module, the cell module (1) comprising a first cell (11) and a second cell (12), characterized in that,

the heat insulation structure (2) is arranged between the first electric core (11) and the second electric core (12), and the heat insulation structure (2) comprises a first silica gel piece (21) with a first cavity (24), a gel piece (22) with a second cavity (25) and a second silica gel piece (23) for heat insulation;

the first silica gel piece (21), the adhesive piece (22) and the second silica gel piece (23) are respectively adhered to opposite inner sides of the first battery cell (11) and the second battery cell (12), and the adhesive piece (22) is covered around the second silica gel piece (23) so that the second silica gel piece (23) is embedded in the second cavity (25);

the first silica gel piece (21) is arranged around the glue piece (22) in a covering mode, and the first silica gel piece (21) is embedded in the first cavity (24).

2. The thermal insulation structure for a cell module according to claim 1, wherein: the second silica gel piece (23) is a heat-insulating silica gel piece, foaming silica gel materials are adopted, double-sided back glue is respectively arranged on two sides of the second silica gel piece (23), and the second silica gel piece (23) is fixedly connected with the opposite inner side faces of the first battery cell (11) and the second battery cell (12) respectively.

3. The thermal insulation structure for a cell module according to claim 2, wherein: the glue piece (22) is structural glue with heat conduction performance, the lower end of the glue piece is in contact with the upper end of the second silicon piece (23), and the upper end of the glue piece (22) is in contact with the lower end of the first silicon piece (21).

4. The thermal insulation structure for a cell module according to claim 3, wherein: the first silica gel piece (21) is a hard silica gel piece with wear resistance, and double-sided back glue is respectively arranged on two sides of the first silica gel piece (21), so that the first silica gel piece (21) is fixedly connected with the opposite inner side surfaces of the first battery cell (11) and the second battery cell (12) respectively.

5. The thermal insulation structure for a cell module according to claim 4, wherein: the thickness of first silica gel piece (21), glue piece (22) with second silica gel piece (23) all equals, when paste in first electric core (11) with behind on the relative medial surface of second electric core (12), make first electric core (11) with second electric core (12) parallel arrangement, just first silica gel piece (21) glue piece (22) with second silica gel piece (23) are in on the coplanar.

6. The thermal insulation structure for a cell module according to claim 1, wherein: the battery cell module (1) is arranged in the box body (3), and the box body (3) comprises a longitudinal beam (31), a fixed steel plate (32) and a side protection plate (33).

7. The thermal insulation structure for a cell module according to claim 6, wherein: the longitudinal beam (31) is a longitudinal beam bracket integrally formed by the box body (3) from the bottom to the top, and the fixed steel plate (32) is fixedly connected with the longitudinal beam (31) and compresses the battery cell module (1).

8. The thermal insulation structure for a cell module according to claim 7, wherein: the side protection plates (33) are perpendicular to the longitudinal beams (31) and are fixedly connected with the fixed steel plates (32), and the side protection plates (33) provide fixed support for a plurality of side-by-side stacked battery modules (1) in the Y-axis direction of the battery modules (1).

9. The thermal insulation structure for a cell module according to claim 8, wherein: the bottom of the battery cell module (1) is fixedly connected with the inner side surface of the bottom of the box body (3) so as to be matched with the fixed steel plate (32), so that a plurality of battery cell modules (1) stacked side by side are fixed in the Z-axis direction of the box body (3).

10. The thermal insulation structure for a cell module according to claim 9, wherein: one side of the first electric core (11) is provided with the heat insulation structure (2), and the first electric core (11) is fixedly connected with the longitudinal beam (31) through the heat insulation structure (2), so that a plurality of electric core modules (1) stacked side by side are fixedly connected with the box body (3) in the X-axis direction.