CN218602585U - Battery module and battery pack - Google Patents

Abstract

The utility model discloses a battery module and a battery pack, which comprises a side plate and a battery pack formed by stacking a plurality of batteries; the side plate is provided with a first insulating layer, and the first insulating layer at least covers the end part of the side plate close to the pole of the battery pack; the resistance value R and the thickness d of the first insulating layer meet, R/d is more than or equal to 10M omega/mm, and the thickness meets the condition that d is more than or equal to 0.1mm and less than or equal to 1mm. The battery pack comprises a battery box body and the battery module, wherein the battery module is arranged in the battery box body. The utility model discloses a first insulation layer that is equipped with on the curb plate is located the utmost point post tip of group battery and can prevents the thermal runaway that arouses because of the utmost point post high temperature of group battery.

Description

Battery module and battery pack

Technical Field

The utility model relates to a power battery technical field especially relates to a battery module and battery package.

Background

At present, the curb plate of battery module is generally made with the sheet metal component, the curb plate all is the cladding in the lateral part position of end plate through its tip with the connection of end plate, then adopt laser welding's mode to go on, form a stable metal frame, then a plurality of groups of arranging in the metal frame, cover the top cap afterwards can, form whole module, metal frame generally all can electrically conduct, the group battery is electrified body also, so, surface can cladding blue membrane structure after the group battery assembles, form insulating, under the higher condition of voltage, blue membrane can puncture easily and lead to insulating inefficacy.

Traditional design can be laminated or the one deck insulating layer of coating at the medial surface of curb plate, and the top and the bottom of this insulating film can turn up towards the top and the bottom of curb plate, increase creepage distance, and insulating effect is better. When one of the battery packs is in thermal runaway in the use process of the battery packs, the self temperature is high, the insulating film in contact with the battery packs is subjected to thermal contraction, and the insulating film is subjected to continuous contraction and is separated from the side plate.

When thermal runaway appears in one of the battery packs, the whole battery system is disconnected, the high voltage of the battery system is concentrated at the position of the battery pack with the thermal runaway, hot melting short circuit easily occurs with the side plates, and the adjacent battery packs are failed in sequence due to conduction of the side plates.

In addition, in the use of general battery module, the utmost point post setting that is used for carrying on electric connection is at the top of group battery, therefore in battery module out of control or use, the temperature of battery module generally can be higher at the utmost point post position temperature at its top, therefore the thermal runaway of group battery takes place on its top easily.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a battery module and a battery pack, the first insulation layer that is equipped with on its curb plate is located the utmost point post tip of group battery and can prevent the thermal runaway who arouses because of the utmost point post high temperature of group battery.

The purpose of the utility model is realized by adopting the following technical scheme:

a battery module comprises a side plate and a battery pack formed by stacking a plurality of batteries; the side plate is provided with a first insulating layer, and the first insulating layer at least covers the end part of the side plate close to the pole of the battery pack; the resistance value R and the thickness d of the first insulating layer meet, R/d is more than or equal to 10M omega/mm, and the thickness meets the condition that d is more than or equal to 0.1mm and less than or equal to 1mm.

The battery pack comprises a battery box body and the battery module, wherein the battery module is arranged in the battery box body.

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. because the curb plate at battery module is equipped with the first insulation layer, and the first insulation layer cladding is close to the tip of the utmost point post of group battery at the curb plate, be used for electrically conductive utmost point post position to appear the too big condition of voltage between adjacent two sets of group batteries, and utmost point post position is close to the curb plate, therefore the distance between curb plate and the utmost point post is shorter, be punctured easily and form the short circuit, thereby arouse large tracts of land thermal runaway, the event lies in the curb plate with the tip that utmost point post is close to with the first insulation layer cladding, prevent the short circuit condition from appearing when thermal runaway, improve insulating effect.

2. The resistance R and the thickness d of the first insulating layer meet, R/d is more than or equal to 10M omega/mm, wherein the thickness meets the condition that d is more than or equal to 0.1mm and less than or equal to 1mm, and the increase of the side volume caused by the fact that the insulating layer is too thick is avoided; meanwhile, the first insulating layer is too thin and is easy to scratch and damage and fail.

Drawings

Fig. 1 is a schematic structural view of a side plate of the present invention;

fig. 2 is a schematic structural view of a side plate of the present invention;

fig. 3 is a schematic structural diagram of the second insulating layer of the present invention;

fig. 4 is a schematic structural diagram of the second insulating layer of the present invention;

fig. 5 is a structural sectional view of a side plate of the present invention;

fig. 6 is another structural sectional view of the side plate of the present invention;

fig. 7 is a schematic structural diagram of the battery module according to the present invention.

In the figure: 10. a side plate; 11. folding edges; 12. a notch; 13. a structural adhesive layer; 20. a second insulating layer; 30. a first insulating layer; 31. a first cladding section; 32. a second coating section; 40. an end plate; 50. a battery pack.

Detailed Description

The invention will be further described with reference to the accompanying drawings and specific embodiments:

in the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

In the case of the example 1, the following examples are given,

a battery module as shown in fig. 1-7, which includes a side plate 10, an end plate 40 and a plurality of battery packs 50, wherein the battery packs 50 are formed by stacking a plurality of batteries, the side plate 10 and the end plate 40 are fixedly connected to form a battery cavity, the plurality of battery packs 50 are assembled in the battery cavity, a first insulating layer 30 is disposed on the side plate 10, the first insulating layer 30 at least covers a long side of any side of the side plate 10, and the first insulating layer 30 covers an end of the side plate 10 close to a pole of the battery pack 50.

It should be noted that, in the embodiment, the inner side of the side plate 10 is the side close to the battery pack 50 during assembly, and the outer side of the side plate 10 may be the side away from the battery pack 50 after assembly, that is, the side exposed outside the battery frame, where the end face where the pole of the battery pack 50 is located is the top end face, and the end face away from the pole of the battery pack 50 is the bottom end face. And the long side of the side plate 10 refers to a stacking direction of the plurality of cells of the battery pack 50.

And in practice, the pole of the battery pack 50 is usually located at the top end, i.e. in this embodiment, the first insulating layer 30 is disposed at the top end of the side plate 10, and after the battery pack 50 is assembled in the battery cavity, the distance between the top end of the side plate 10 and the pole of the battery pack 50 is the shortest.

Because group battery 50 is in the use, generally can be used for the too big condition of voltage to appear in electrically conductive utmost point post position between adjacent two sets of group batteries 50, and utmost point post position is close to curb plate 10, therefore the distance between the top of curb plate 10 and the utmost point post is shorter, it forms the short circuit to be punctured the easiest, thereby arouse large tracts of land thermal runaway, in thermal runaway, the event can be that it carries out high temperature insulation directly when thermal runaway appears in utmost point post position to set up first insulation layer 30 on the top of curb plate 10 body, prevent that the short circuit from appearing in this position and lead to the thermal runaway of other positions, insulating effect is better. And the application of insulating materials can be reduced, and the cost is saved.

It should be noted that if the first insulating layer 30 is too thick, the volume of the whole side plate 10 is increased, and the energy density of the battery pack is affected, and if the first insulating layer 30 is too thin, on one hand, the first insulating layer 30 is easily scratched to be damaged and failed, and on the other hand, the heat of the battery is quickly conducted away by the side plate 10, so that the heat of the whole battery pack 50 is unbalanced, and the performance of the battery is affected.

Therefore, the resistance R and the thickness d of the first insulating layer 30 in the embodiment satisfy, R/d is greater than or equal to 10M omega/mm, wherein the thickness satisfies that d is greater than or equal to 0.1mm and less than or equal to 1mm, and the increase of the volume of the side plate 10 caused by the excessive thickness of the first insulating layer 30 is avoided; meanwhile, the damage and failure caused by the fact that the first insulating layer 30 is too thin and is easily scratched can be avoided, the heat dissipation of the battery pack is not influenced, and the performance of the battery is improved.

In this embodiment, the first insulating layer 30 may adopt two coating structures:

the first cladding structure is (see fig. 3 and 5), the first insulating layer 30 includes a first cladding section 31 and a second cladding section 32, the first cladding section 31 is clad on the second insulating layer 20, and the second cladding section 32 can be clad on the top end surface of the side panel 10 and connected with the first cladding section 31.

On this structure basis, because the insulation resistance of first insulation layer 30 is higher, in order to realize high temperature resistance, generally can the composite ceramic isotructure, therefore the insulating layer structural surface who forms can be comparatively coarse, be difficult to laminate to the curb plate 10 on, so this application directly adopts the direct laminating of the medial surface of first cladding section 31 and curb plate 10, and the direct laminating of the top face of second cladding section 32 and curb plate 10, the binding face all is the plane promptly, therefore the laminating degree is better, prevent the condition on the stick-up limit, and facilitate the processing.

In addition, since the first wrapping section 31 is directly attached to the side surface of the side plate 10 and the second wrapping section 32 is directly attached to the top end surface of the side plate 10, the first insulating layer 30 is in contact with the side surface of the battery pack 50 only through the first wrapping section 31 during use, and no unnecessary part is in contact with the top end of the battery pack 50, so that the first insulating layer 30 is not scratched regardless of whether a height difference exists between adjacent battery packs 50 or whether the adjacent battery packs 50 move up and down during use of the battery pack 50, and thus the service life is longer.

Because in the use of the battery module, the battery tends to move in the vertical direction, and if the battery pack 50 moves vertically in the use process, if the first coating structure is adopted, the battery pack 50 is easily separated from the side plate 10 due to friction in the vertical movement process, and on the other hand, the surface structure of the first insulating layer 30 is easily scratched due to friction in the vertical movement process, so that the service life is reduced.

Therefore, the present embodiment further provides a second cladding structure:

the second cladding structure is (see fig. 4 and fig. 6), specifically, the side plate 10 includes a side plate body and a folded edge 11 that is folded from the side plate body toward the pole of the battery pack 50, the first insulating layer 30 includes a second cladding section 32, and the second cladding section 32 is partially clad on the folded edge.

On the basis of the second coating structure, the top end of the battery pack 50 can be limited by the inward bent flanging edge 11, the second coating section 32 coated on the flanging edge 11 can be pressed on the top end of the battery pack 50, certain pre-tightening force is applied to the battery pack 50, the shifting condition of the battery pack 50 in the using process is buffered, the risk that the battery pack 50 scratches the first insulating layer 30 in the up-and-down shifting process is reduced, and the using efficiency of the first insulating layer 30 is improved.

In addition, because a plurality of group battery 50 are in the assembling process, the assembly height assembly difference can appear in two adjacent group battery 50, can make the battery module top after the assembly uneven, so can be spacing through turning over hem 11 and cladding second cladding section 32 on turning over hem 11, stability after group battery 50 assembles is better.

Because second cladding section 32 is the cladding of part at turning over hem 11, and utmost point post position is close to curb plate 10, therefore the distance between the top of curb plate 10 and the utmost point post is shorter, it forms the short circuit to be punctured the easiest, thereby arouse large tracts of land thermal runaway, on this structure basis that has turning over hem 11, only need at turning over hem 11 upper portion cladding second cladding section 32, this second cladding section 32 with the utmost point post of group battery 50 insulating support by alright, so, practice thrift the use material on the first insulation layer, practice thrift the cost.

Specifically, the coating structure of the second coating section 32 on the folded edge 11 may also be that the second coating section 32 coats the inner side surface, the top end surface and the bottom end surface of the folded edge 11, that is, the second coating section 32 and the folded edge 11 are completely coated, so that the creepage distance is increased, and the insulation effect is better.

Furthermore, the first insulating layer 30 may also have a first wrapping section 31 and a second wrapping section 32, the first wrapping section 31 may wrap the inner side and/or the outer side of the side panel body, on the basis of the structure, the first wrapping section 31 wraps the side panel body, and the second wrapping section 32 wraps the folded edge 11, that is, the first insulating layer 30 is "7" shaped.

After the assembly of group battery 50, the second cladding section 32 on the hem 11 realizes insulating with the utmost point post structure of group battery 50, and the electrically conductive creepage distance of back thermal runaway at group battery 40 is the total length that first cladding section 31 and second cladding section 32 formed, therefore the creepage distance between multiplicable group battery and the curb plate of first cladding section of curb plate body side then, and insulating effect is better.

Further, in this embodiment, the second wrapping section 32 extends toward the side panel body, and after the extension, the first wrapping section 31 may be partially connected to the second wrapping section 32, and specifically, the first wrapping section 31 and the second wrapping section 32 are partially overlapped to realize the connection, however, the thickness of the first insulating layer 30 at the overlapping position of the first wrapping section 31 and the second wrapping section 32 may be thickened by this connection mode, which affects the energy density of the battery pack. Therefore, the structure of the first cladding section 31 and the second cladding section 32 which are integrally formed can be selected, the overall thickness of the first insulating layer 30 is not increased, and materials are saved.

Further, referring to fig. 2, the end of the turned edge 11 is spaced apart from the end of the side plate 10 and forms a notch 12 at the top end of the side plate 10, and the end of the second wrapping section 32 extends to the end of the side plate 10. Even if the length of the turned edge 11 at the top end of the side plate 10 is smaller than the length of the side plate 10 during processing, the bent edge 11 can be bent easily by forming the notch 12 between the end of the turned edge 11 and the end of the side plate 10 after processing. The length of the second cladding section 32 cladding the turned-over edge 11 is consistent with that of the side plate 10, and the creepage distance is increased.

Furthermore, the wrapping structure of the first insulating layer 30 is either the first type or the second type, two first wrapping sections 31 are provided, and the top ends of the two first wrapping sections 31 are connected to two sides of the second wrapping section 32, wherein one of the first wrapping sections 31 wraps the second insulating layer 20 of the side plate 10, and the other first wrapping section 31 wraps the outer side surface of the side plate 10. Thus, the first insulating layer 30 may extend upward to the top end surface of the side plate 10 through the top end inner side surface of the side plate 10, and then extend downward to the outer side surface of the side plate 10, and the formed creepage distance is the height of the two first coating sections 31 and the width of the second coating section 32, and is longer, and the insulating effect is better.

Further, referring to fig. 5 and fig. 6, based on the structure that the first wrapping section 31 wraps the top end of the side plate 10, that is, the first wrapping section 31 does not wrap the bottom, the bottom end surface of the first wrapping section 31 and the bottom end surface of the side plate 10 are disposed at an interval. Therefore, the inner side surface of the side plate 10 can be coated with the structural adhesive layer 13, the structural adhesive layer 13 is filled in the space between the bottom end surface of the first wrapping section 31 and the bottom end surface of the side plate 10, and after the battery pack 50 is assembled in the battery cavity, the structural adhesive layer 13 can be bonded with the side surface of the battery pack 50.

Because when the battery module assembly, curb plate 10 is the butt in the side of group battery 50, and the top cladding of curb plate 10 has first parcel section 31, therefore can form a thickness difference from top to bottom at the medial surface of curb plate 10, lead to group battery 50 to appear controlling the unstable condition after the assembly, so can be in the bottom face below filling structure glue film 13 of first parcel section 31 at the board body, can be more stable after curb plate 10 assembles with group battery 50.

Further, the projection area of the first wrapping section 31 on the side surface of the battery pack 50 is S1, the side surface area of the battery pack 50 is S2, and S1 is not more than S2 × 0.2, on the basis of the structure, the height of the first wrapping section 31 on the side plate 10 can correspond to the height of the pole of the battery pack 50, and the structural adhesive layer 13 below the first wrapping section 31 has a larger adhesive surface to be adhered to the side surface of the battery pack 50, so that the adhesive structure is more stable; and the first coating section 31 uses less materials and has lower cost.

Further, an end of the first insulating layer 30 is disposed at an interval from an end of the side plate 10, that is, the first insulating layer 30 does not extend to an end of a long side of the side plate 10 when extending along the long side of the side plate 10.

Because when the battery module is assembled, the battery module generally adopts a plurality of battery packs 50 connected in series or a plurality of battery packs 50 connected in parallel to be connected in series, and no matter which assembling mode is adopted, the position of the battery pack 50 close to the end plate 40 is directly heat-conductive because of the end plate 40, when thermal runaway occurs to one group or one battery pack 50 close to the end plate 40, the generated high temperature can be quickly led out by the end plate 40, and therefore, the situation that the second insulating layer 20 fails due to the high temperature is not easy to occur to the battery pack 50 close to the end plate 40.

In consideration of the material cost of the first insulating layer 30, the first insulating layer 30 may be extended to be spaced apart from the side plate 10 by a distance corresponding to the width of one battery pack 50 or the width of one battery pack 50 from the end plate 40, so that the first insulating layer 30 can be concentrated at a plurality of battery packs 50 or a plurality of battery packs 50 located at the middle position.

Further, a heat insulation pad is arranged between two adjacent battery packs 50, and the heat insulation pad and the first insulation layer 30 on the side plate 10 can form an insulation frame, so that heat generated between the two adjacent battery packs 50 can be separated, thermal isolation is realized, and the situation that the battery packs 50 are out of control due to heat concentration is reduced.

Since the end plate 40 itself can directly conduct heat for heat dissipation, no heat insulating pad is disposed between the cells adjacent to the end plate 40 and the end plate 40 when the battery pack 50 is stacked, and thus the end of the first insulating layer 30 may be extended to a position corresponding to the heat insulating pad closest to the end plate 40 (i.e., the heat insulating pad between the outermost cell of the same battery pack 50 and the cell adjacent thereto), so that the insulating area of the first insulating layer 30 is maximized without material waste.

Further, in the present embodiment, the first insulating layer 30 is a ceramic composite tape, and the ceramic composite tape is formed by compounding fiber cloth and ceramic silicone rubber. It should be noted that, because in the use process of the battery pack 50 of the battery module, when thermal runaway occurs, high temperature can be locally generated, and therefore, by arranging the ceramic composite belt structure, the withstand temperature of the ceramic silicon rubber can reach more than 800 ℃, so that failure can not occur when thermal runaway occurs.

Meanwhile, since the fiber cloth has not only a smooth surface but also high strength, light weight and high temperature resistance, and then the fiber cloth may be used as a coating base to attach the ceramic silicone rubber to the fiber cloth, the ceramic silicone rubber has high temperature resistance, so that the formed first insulating layer 30 can resist high temperature, and the high temperature generated when the battery pack 50 is thermally failed is not enough to cause the failure of the first insulating layer 30, so that the insulating property is more stable. The fiber cloth is high temperature resistant, and cannot be aged by the high temperature environment in the battery frame in the use process of the battery, so that the formed first insulating layer 30 is not easy to lose efficacy.

In addition, since the fiber cloth has a smooth surface, when the battery pack 50 is in contact with the first insulating layer 30 on the side plate 10, the fiber cloth has a smooth surface, which does not scratch the battery pack 50 when in contact with the battery pack 50, and reduces the surface friction between the battery pack 50 and the first insulating layer 30, so that the first insulating layer 30 is not easily separated during vibration even if the battery pack 50 vibrates up and down during vibration use.

It should be noted that the fiber cloth may be made of PET fiber, PI fiber, PMI fiber, carbon fiber, or glass fiber. In addition, the fiber cloth can be replaced by an organic insulating film (such as polyethylene) in the prior art.

Further, the insulation resistance of the first insulation layer 30 in the present embodiment is 10M Ω, and the first insulation layer 30 can endure the high temperature of the post position of the battery pack 50 on the basis of the structure in which the insulation resistance of the first insulation layer 30 is 10M Ω.

In addition, the thickness of the first insulating layer 30 is 0.3mm to 0.4mm.

In the case of the example 2, the following examples are given,

the battery module in this embodiment is different from the battery module in embodiment 1 in that a second insulating layer 20 may be further disposed on an inner side surface of the side plate 10 of the battery module, and the first insulating layer 30 is wrapped on a long side of any one side of the side plate 10. Specifically, the insulation resistance of the first insulation layer 30 is higher than the insulation resistance of the second insulation layer 20.

It should be noted that the inner side of the side plate 10 in the embodiment is the side close to the battery pack 50 during assembly, and the outer side of the side plate 10 may be the side away from the battery pack 50 after assembly, i.e. the side exposed outside the battery frame.

In assembling the battery module, the plurality of battery packs 50 are generally assembled in the battery case composed of the side plate 10 and the end plate 40, and after the assembly, the side of the side plate 10 extending in the arrangement direction of the plurality of battery packs 50 is a long side, so that the second insulating layer 20 may be coated on the inner side of the long side of the side plate 10, and the first insulating layer 30 and the second insulating layer 20 may abut against the side surface of the battery pack 50 to realize insulation. In normal use of the battery pack 50, the temperature of the battery pack 50 is not too high, and thus the second insulating layer 20 and the first insulating layer 30 do not have an insulating failure.

Because the battery pack 50 is in use, the situation that the voltage is too large generally occurs at the position of the conductive pole column between two adjacent sets of battery packs 50, and the position of the pole column is close to the side plate 10, so that the distance between the side plate 10 and the pole column is short, the short circuit is easily broken down, and a large-area thermal runaway is caused, and meanwhile, the second insulating layer 20 may fail due to high heat, so that the first insulating layer 30 is further coated on the long side of the side plate 10, and because the insulation resistance value temperature of the first insulating layer 30 is high, the arranged first insulating layer 30 can play a role of high-temperature insulation outside the second insulating layer 20, so that the high temperature is isolated from the second insulating layer 20, the breakdown failure of the second insulating layer 20 under the high-temperature condition is prevented, and the effect of insulating and heat insulation is better.

In addition, since the first insulating layer 30 is coated on the second insulating layer 20, the first insulating layer 30 can increase the insulating thickness, thereby increasing the creepage distance and improving the insulating effect.

Specifically, in the present embodiment, the first insulating layer 30 may be coated on the top end of the side panel 10, that is, the first insulating layer 30 may be distributed on the top end of the side panel 10, and the distribution on the top end of the side panel 10 may also have two ways:

in a first manner, a gap may be formed between the top end of the second insulating layer 20 and the top end of the side plate 10, the first insulating layer 30 may be disposed between the top end of the second insulating layer 20 and the top end of the side plate 10, the bottom end of the first insulating layer 30 is connected to the top end of the second insulating layer 20, and the top end of the first insulating layer 30 extends to the top end surface of the side plate 10. On the basis of the structure, the insulating layer area of the inner side surface of the side plate 10 is formed by the second insulating layer 20 and the first insulating layer 30 which are distributed up and down, and the first insulating layer 30 and the second insulating layer 20 are not overlapped, so that the formed insulating layer is thinner as a whole.

In the second way, the top end of the second insulating layer 20 is directly covered on the top end of the side panel 10, and the first insulating layer 30 can be covered on the top end of the second insulating layer 20. On the other hand, in this structure, the first insulating layer 30 and the second insulating layer 20 may be overlapped at the top end of the insulating layer on the inner surface of the side panel 10, and thus the insulating layer is thick at the top end position.

In practical use, since the terminal for electrical connection between two adjacent battery packs 50 is generally disposed at the top end of the battery pack 50, the temperature of the battery pack 50 is generally higher at the terminal position at the top of the battery pack 50 during thermal runaway of the battery pack 50 or during use, so that the thermal runaway of the battery pack 50 is likely to occur at the top end of the battery pack 50. In this embodiment, since the top end of the side plate 10 abuts against the battery pack 50 through the first insulating layer 30 having a large insulation resistance, when the battery pack 50 is thermally runaway, the first insulating layer 30 does not fail due to a high temperature, and the bottom end of the battery pack 50 is insulated and insulated by the second insulating layer 20.

The second insulating layer 20 and the first insulating layer 30 are arranged in the above manner because the higher the insulation resistance of the insulating material is, the higher the material cost is, so the embodiment only needs to arrange the first insulating layer 30 on the top end of the side plate 10, which saves the cost.

Because the second mode compares in first mode, the thickness of insulating layer can be thicker on the top, increases the insulating layer thickness on the top of curb plate 10 promptly, and then increases curb plate 10 top creepage distance, prevents that the condition of puncturing from appearing in thermal runaway position on curb plate 10 top, so insulating effect can be better.

It should be noted that the first insulating layer 30 may also be made of a high temperature resistant glue or a high temperature resistant glue coated on the side plate 10 and the second insulating layer 20. Compared with the first insulating layer 30 formed by glue solution, the second insulating layer formed by the high-temperature-resistant glue pad needs to be connected by adopting other structures, such as glue or structural assembly by adopting screws, and the like, so that the glue pad can be coated on the side plate 10.

In the case of the example 3, the following examples are given,

in this embodiment, a battery pack may be provided, referring to fig. 1 to 7, including a battery case and the battery module of embodiment 1 or embodiment 1, in which a plurality of battery packs 50 are assembled into a battery case composed of side plates 10 and end plates 40 when the battery module is assembled, and after the assembly, the battery module may be assembled into the battery case.

Because group battery 50 is in the use, generally can be used for the too big condition of voltage to appear in electrically conductive utmost point post position between adjacent two sets of group batteries 50, and utmost point post position is close to curb plate 10, therefore the distance between the top of curb plate 10 and the utmost point post is shorter, it forms the short circuit to be punctured the easiest, thereby arouse large tracts of land thermal runaway, in thermal runaway, the event can be that it carries out high temperature insulation directly when thermal runaway appears in utmost point post position to set up first insulation layer 30 on the top of curb plate 10 body, prevent that the short circuit from appearing in this position and lead to the thermal runaway of other positions, insulating effect is better. And the application of insulating materials can be reduced, and the cost is saved.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes are intended to fall within the scope of the claims.

Claims (18)

1. A battery module comprises a side plate (10) and a battery pack (50) formed by stacking a plurality of batteries; it is characterized in that the preparation method is characterized in that,

a first insulating layer (30) is arranged on the side plate (10), and the first insulating layer (30) at least covers the end part of the side plate (10) close to the pole of the battery pack (50); the resistance value R and the thickness d of the first insulating layer meet, R/d is more than or equal to 10M omega/mm, and the thickness meets the condition that d is more than or equal to 0.1mm and less than or equal to 1mm.

2. The battery module according to claim 1, wherein the first insulating layer (30) comprises a first coating section (31) and a second coating section (32), the first coating section (31) is coated on the inner side surface of the side plate (10), and the second coating section (32) is connected to the top end surface of the side plate (10) and is connected to the first coating section (31).

3. The battery module according to claim 2, wherein the number of the first wrapping sections (31) is two, the top ends of the two first wrapping sections (31) are connected to two sides of the second wrapping section (32), one of the first wrapping sections (31) wraps the inner side of the side plate (10), and the other first wrapping section (31) wraps the outer side of the side plate (10).

4. The battery module according to claim 1, wherein the side plate (10) comprises a side plate body and a flanging (11) bent from the side plate body toward a pole of the battery pack (50); the first insulating layer (30) comprises a second coating section (32), and the second coating section (32) is partially coated on the flanging edge (11).

5. The battery module according to claim 4, wherein the second coating section (32) coats the inner side surface, the top end surface and the bottom end surface of the flanging (11).

6. The battery module according to claim 4, wherein the first insulating layer (30) further comprises a first wrapping section (31), and the first wrapping section (31) partially wraps the side plate body inner side and/or outer side.

7. The battery module according to claim 6, wherein the second sheathing section extends toward the side plate body and is partially connected to the first sheathing section (31).

8. The battery module according to claim 4, wherein, in the stacking direction of the batteries, the end of the turned-over edge (11) on at least one side of the side plate is spaced from the end of the side plate body and forms a notch (12) at the top end of the side plate (10); the end of the second coating section (32) extends to the end of the side plate (10).

9. The battery module according to any one of claims 2, 3, 6 and 7, wherein the bottom end surface of the first wrapping section (31) is spaced from the bottom end surface of the side plate (10); the inner side surface of the side plate (10) is coated with a structural adhesive layer (13); the structural adhesive layer (13) is filled in the space between the bottom end face of the first wrapping section (31) and the bottom end face of the side plate (10) and is bonded with the side face of the battery pack (50).

10. The battery module according to claim 7, wherein the projection area of the first wrapping section (31) on the side of the battery pack (50) is S1, the side area of the battery pack (50) is S2, and S1 is ≦ S2 × 0.2.

11. The battery module according to claim 1, further comprising an end plate (40); the end plates (40) and the side plates (10) are fixed to form a battery cavity, and the battery packs (50) are mounted in the battery cavity.

12. The battery module of claim 11, wherein a thermal insulating mat is disposed within the battery pack; the ends of the first insulating layer (30) extend to the insulation blanket of the battery pack (50) adjacent the end plate (40).

13. The battery module according to claim 1, wherein the first insulating layer (30) is a ceramic composite tape; the ceramic composite belt comprises fiber cloth and ceramic silicon rubber, wherein the ceramic silicon rubber is coated on the fiber cloth.

14. The battery module according to claim 1, wherein the insulation resistance of the first insulation layer (30) is 10M Ω, and the first insulation layer (30) withstands a temperature of not less than 800M Ω ^O C; the thickness of the first insulating layer (30) is 0.3mm-0.4mm.

15. The battery module according to any one of claims 1 to 8, wherein the inner side of the side plate (10) is provided with a second insulating layer (20), and the insulation resistance of the first insulating layer (30) is higher than the insulation resistance of the second insulating layer (20).

16. The battery module according to claim 15, wherein the top end surface of the second insulating layer (20) is spaced apart from the top end surface of the side plate (10); the first insulating layer (30) is wrapped on the top end of the side plate (10) and connected with the top end of the second insulating layer (20).

17. The battery module according to claim 15, wherein the top end surface of the second insulating layer (20) extends to the top end of the side plate (10), and the first insulating layer (30) covers the top end of the second insulating layer (20).

18. A battery pack, comprising a battery case and the battery module according to any one of claims 1 to 17, wherein the battery module is mounted in the battery case.

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