CN218602585U - Battery module and battery pack - Google Patents

Abstract

The utility model discloses a battery module group and a battery pack, comprising 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 covers at least part of the The side plate is close to the end of the pole of the battery pack; the resistance R and thickness d of the first insulating layer satisfy, R/d≥10MΩ/mm, wherein the thickness satisfies 0.1mm≤d≤1mm. A battery pack includes a battery box and the battery module, and the battery module is installed in the battery box. The first insulating layer provided on the side plate of the utility model is located at the pole end of the battery pack to prevent thermal runaway caused by excessive temperature of the pole pole of the battery pack.

Description

A battery module and battery pack

technical field

The utility model relates to the technical field of power batteries, in particular to a battery module and a battery pack.

Background technique

At present, the side plate of the battery module is generally made of sheet metal, and the connection between the side plate and the end plate is through the end of which is coated on the side of the end plate, and then laser welding is used to form a A stable metal frame, and then arrange multiple battery packs in the metal frame, and then cover the top cover to form the entire module, and the metal frame is generally conductive, and the battery pack is also a charged body. In this way, when the battery pack is assembled The rear surface will be covered with blue film structure to form insulation. In the case of high voltage, the blue film will easily break down and cause insulation failure.

In the traditional design, the inner side of the side plate will be laminated or coated with an insulating layer, and the top and bottom of the insulating film will be turned towards the top and bottom of the side plate to increase the creepage distance and achieve better insulation effect . When one of the battery packs experiences thermal runaway during the use of the battery pack, its own temperature is high, which will cause thermal shrinkage of the insulating film in contact with it, which will cause the insulating film to continue to shrink and separate from the side plate.

When one of the battery packs suffers from thermal runaway, the entire battery system will be disconnected, and the high voltage of the battery system will be concentrated at the position of the battery pack where the thermal runaway occurs. battery packs fail sequentially.

In addition, during the use of a general battery module, the poles used for electrical connection are set on the top of the battery pack. Therefore, when the battery module is out of control or in use, the temperature of the battery module will generally be at the top of the pole. The location is hotter, so thermal runaway of the battery pack tends to occur at its top.

Utility model content

In order to overcome the deficiencies of the prior art, the purpose of this utility model is to provide a battery module and a battery pack. The first insulating layer provided on the side plate is located at the end of the pole of the battery pack to prevent damage caused by the pole of the battery pack. Thermal runaway caused by excessive column temperature.

The purpose of this utility model adopts following technical scheme to realize:

A battery module, comprising a side plate and a battery pack formed by stacking several batteries; the side plate is provided with a first insulating layer, and the first insulating layer covers at least part of the side plate close to the battery pack The end of the pole; the resistance value R of the first insulating layer meets the thickness d, R/d≥10MΩ/mm, and the thickness satisfies 0.1mm≤d≤1mm.

A battery pack includes a battery box and the battery module, and the battery module is installed in the battery box.

Compared with the prior art, the beneficial effects of the utility model are:

1. Since the first insulating layer is provided on the side plate of the battery module, and the first insulating layer is coated on the end of the side plate close to the pole of the battery pack, it is used for conducting between two adjacent battery packs. There is an excessive voltage at the position of the pole, and the position of the pole is close to the side plate, so the distance between the side plate and the pole is short, and it is easy to be broken down to form a short circuit, which will cause a large area of thermal runaway. Therefore, the first The insulating layer covers the end near the side plate and the pole to prevent short circuit when thermal runaway occurs and improve the insulation effect.

2. The resistance R of the first insulating layer and the thickness d meet, R/d≥10MΩ/mm, and the thickness satisfies 0.1mm≤d≤1mm, so as to avoid the increase of side volume caused by too thick insulating layer; at the same time It can be damaged and invalidated because the first insulating layer is too thin and easily scratched.

Description of drawings

Fig. 1 is the structural representation of side panel of the present utility model;

Fig. 2 is the structural representation of side panel of the present utility model;

FIG. 3 is a schematic structural view of a second insulating layer of the present invention;

FIG. 4 is a schematic structural view of a second insulating layer of the present invention;

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

Fig. 6 is another structural sectional view of the side panel of the present invention;

FIG. 7 is a schematic structural diagram of the battery module of the present invention.

In the figure: 10, side panel; 11, folded edge; 12, gap; 13, structural adhesive layer; 20, second insulating layer; 30, first insulating layer; 31, first cladding section; 32, second cladding section; 40, end plate; 50, battery pack.

Detailed ways

Below, in conjunction with accompanying drawing and specific embodiment, the utility model is described further:

In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and other indicated orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying No device or element must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of this invention. The terminology used in the description of the utility model herein is only for the purpose of describing specific embodiments, and is not intended to limit the utility model.

Example 1,

A battery module as shown in Figures 1-7, including a side plate 10, an end plate 40, and a number of battery packs 50, the battery pack 50 is formed by stacking a plurality of batteries, and the side plates 10 and end plates 40 are fixedly connected to form a battery Cavity, a number of battery packs 50 are assembled in the battery cavity, a first insulating layer 30 is provided on the side plate 10, the first insulating layer 30 covers at least the long sides of any side of the side plate 10, and the first insulating layer 30 is wrapped around the end of the side plate 10 close to the pole of the battery pack 50 .

It should be noted that the inside of the side plate 10 indicated in this embodiment is the side close to the battery pack 50 during assembly, while the outside of the side plate 10 may refer to the side facing away from the battery pack 50 after assembly, that is, exposed to the battery frame On the side of the body, the end face where the pole of the battery pack 50 is located is the top face, and the end face away from the pole of the battery pack 50 is the bottom end face. The long side of the side plate 10 refers to the stacking direction of the batteries of the battery pack 50 .

And in the actual process, the pole of the battery pack 50 is usually located at the top, that is, in this embodiment, the first insulating layer 30 is arranged on the top of the side plate 10, after the battery pack 50 is assembled in the battery cavity, the side plate 10 The distance between the top of the top and the pole of the battery pack 50 is the shortest.

Since the battery pack 50 is in use, generally there will be an excessive voltage at the pole position used for conduction between two adjacent groups of battery packs 50, and the pole position is close to the side plate 10, so the top of the side plate 10 The distance between the pole and the pole is short, and it is most likely to be broken down to form a short circuit, thereby causing a large area of thermal runaway. At the same time as the thermal runaway, it is possible to set the first insulating layer 30 on the top of the side plate 10 body to directly High-temperature insulation is carried out when thermal runaway occurs at the pole position to prevent short circuit at this position from causing thermal runaway at other positions, and the insulation effect is better. In addition, the application of insulating materials can be reduced to save costs.

It should be noted that if the first insulating layer 30 is too thick, the volume of the entire side plate 10 will increase, thereby affecting the energy density of the battery pack. If the first insulating layer 30 is too thin, on the one hand, the first insulating layer 30 It is easy to be scratched and damaged, and on the other hand, it will cause the heat of the battery to be quickly conducted away by the side plate 10, which will make the heat of the entire battery pack 50 unbalanced and affect the performance of the battery.

Therefore, the resistance R and the thickness d of the first insulating layer 30 in this embodiment satisfy, R/d≥10MΩ/mm, wherein the thickness satisfies 0.1mm≤d≤1mm, so as to avoid side effects due to the first insulating layer 30 being too thick. The volume of the board 10 increases; at the same time, it can avoid damage and failure due to the first insulating layer 30 being too thin to be easily scratched, and it will not affect the heat dissipation of the battery pack and improve the performance of the battery.

In this embodiment, the above-mentioned first insulating layer 30 can choose two coating structures:

The first cladding structure is (see FIG. 3 and FIG. 5 ), the first insulating layer 30 includes a first cladding segment 31 and a second cladding segment 32, and the first cladding segment 31 is clad on the second insulating layer 20 , while the second wrapping section 32 can wrap the top surface of the side panel 10 and connect with the first wrapping section 31 .

On the basis of this structure, due to the high insulation resistance of the first insulating layer 30, in order to achieve high temperature resistance, it is generally compounded with ceramics and other structures, so the surface of the formed insulating layer structure may be relatively rough, and it is not easy to attach to the side plate 10, so this application directly adopts the first cladding section 31 to be directly bonded to the inner surface of the side plate 10, while the second cladding section 32 is directly bonded to the top surface of the side plate 10, that is, the bonding surfaces are all flat , so the fit is better, prevent warping, and facilitate processing.

In addition, since the first covering section 31 is directly attached to the side surface of the side panel 10, and the second covering section 32 is directly attached to the top surface of the side panel 10, during use, the first insulating layer 30 only passes through the first The cladding section 31 is in contact with the side of the battery pack 50, and there is no excess part in contact with the top of the battery pack 50. In this way, during the use of the battery pack 50, regardless of whether there is a height difference between adjacent battery packs 50, or whether there is a difference between the top and bottom of the battery pack 50 No movement will scratch the first insulating layer 30, so the service life is longer.

Because during the use of the battery module, the battery will have a tendency to move up and down, and if the battery pack 50 moves up and down during use, if the first coating structure is adopted, the battery pack 50 will In the process of moving up and down, it is easy to separate the first insulating layer and the side plate 10 due to friction, and on the other hand, it is also easy to scratch the surface structure of the first insulating layer 30 due to friction in the process of moving up and down. , reduce the service life.

Therefore, this embodiment also provides a second covering 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 bent from the side plate body toward the pole of the battery pack 50, the above-mentioned first insulation Layer 30 includes a second wrapping section 32 that partially wraps over the folded edge.

On the basis of the second covering structure, the top of the battery pack 50 can be restricted by the inwardly bent turning edge 11, and the second covering section 32 wrapped on the turning edge 11 can Compress the top of the battery pack 50, apply a certain pre-tightening force to the battery pack 50, buffer the movement of the battery pack 50 during use, and reduce the scratching of the first insulating layer during the up and down movement of the battery pack 50 30, improve the use efficiency of the first insulating layer 30.

In addition, during the assembly process of multiple battery packs 50, two adjacent battery packs 50 may have assembly height differences, which may make the top of the assembled battery module uneven. The second cladding section 32 on the folded edge 11 is used to limit the position, and the stability of the assembled battery pack 50 is better.

Since the second covering section 32 is partially covered on the folded edge 11, and the position of the pole is close to the side plate 10, the distance between the top of the side plate 10 and the pole is relatively short, and it is most likely to be broken down to form a short circuit. Thus causing a large area of thermal runaway, on the basis of the structure with the folded edge 11, only the second covering section 32 needs to be partially covered on the turned edge 11, and the second covering section 32 is compatible with the battery pack 50. It is only necessary for the poles to be insulated and abutted, thus saving the materials used for the first insulating layer and saving costs.

Specifically, the covering structure of the above-mentioned second covering section 32 on the turning edge 11 may also be that the second covering section 32 covers the inner surface, the top end surface and the bottom end surface of the turning edge 11, that is, the second wrapping section 32 Covering section 32 is fully covered with folded edge 11, increasing creepage distance and better insulation effect.

Furthermore, the first insulating layer 30 may also have a first covering section 31 and a second covering section 32, the first covering section 31 may cover the inner side and/or the outer side of the side plate body, Based on this structure, the first covering section 31 covers the side panel body, and the second covering section 32 covers the folded edge 11 , that is, the first insulating layer 30 is in the shape of "7".

After the battery pack 50 is assembled, the second cladding section 32 on the folded edge 11 is insulated from the pole structure of the battery pack 50, and the conductive creepage distance of the first cladding section 31 after the thermal runaway of the battery pack 40 is and the total length formed by the second cladding section 32, so the first cladding section on the side of the side plate body can increase the creepage distance between the battery pack and the side plate, and the insulation effect is better.

Further, in this embodiment, the above-mentioned second cladding section 32 extends toward the main body of the side panel. After the extension, the first cladding section 31 may be partially connected to the second cladding section 32, specifically, the first cladding section 31 may be partially connected to the second cladding section 32. The section 31 is partially overlapped with the second cladding section 32 to realize the connection, however, this connection method will thicken the thickness of the first insulating layer 30 at the superposition of the first cladding section 31 and the second cladding section 32, affect the energy density of the battery pack. Therefore, the integrally formed structure of the first covering section 31 and the second covering section 32 can be selected, without increasing the overall thickness of the first insulating layer 30 and saving materials.

Further, referring to FIG. 2 , the end of the folded edge 11 is spaced apart from the end of the side panel 10 and forms a notch 12 at the top of the side panel 10 , and the end of the second covering section 32 extends to the end of the side panel 10 department. Even say, during processing, the length of the turned edge 11 at the top of the side plate 10 is less than the length of the side plate 10, the gap 12 formed at intervals between the end of the turned edge 11 and the end of the side plate 10 after processing can be convenient to turn over. The bending of the folded edge 11. However, the length of the second covering section 32 wrapped on the folded edge 11 is still consistent with the length of the side plate 10, so as to increase the creepage distance.

Further, regardless of whether the coating structure of the first insulating layer 30 is the first type or the second type, there are two first coating sections 31, and the top ends of the two first coating sections 31 are connected to the first coating section 31. On both sides of the two covering sections 32 , one of the first covering sections 31 covers the second insulating layer 20 of the side plate 10 , and the other first covering section 31 covers the outer surface of the side plate 10 . In this way, the first insulating layer 30 can extend upwards to the top surface of the side plate 10 through the top inner surface of the side plate 10, and then extend downwards to the outer surface of the side plate 10, forming a creepage distance equal to that of two first claddings. The height of the segment 31 and the width of the second cladding segment 32 have a longer creepage distance and a better insulation effect.

Further, referring to Fig. 5 and Fig. 6, based on the structural basis that the first cladding section 31 is clad on the top of the side plate 10, that is, the first cladding section 31 is not covered to the bottom, so the first cladding section 31 The bottom end surface is spaced apart from the bottom end surface of the side plate 10 . Therefore, the inner surface of the side plate 10 can be coated with a structural adhesive layer 13, and the structural adhesive layer 13 is filled in the gap between the bottom end surface of the first cladding section 31 and the bottom end surface of the side plate 10, and the battery pack 50 is assembled. After the battery cavity, the structural adhesive layer 13 can be bonded to the side of the battery pack 50 .

Since the side plate 10 abuts against the side of the battery pack 50 when the battery module is assembled, and the top end of the side plate 10 is covered with the first covering section 31, a vertical wall is formed on the inner surface of the side plate 10. The difference in thickness causes the left and right sides of the battery pack 50 to be unstable after assembly. Therefore, the structural adhesive layer 13 can be filled under the bottom end surface of the plate body located at the first cladding section 31, and the side plate 10 and the battery pack 50 can be assembled. more stable.

Further, the projected area of the first covering section 31 on the side of the battery pack 50 is S1, the area of the side of the battery pack 50 is S2, and S1≤S2*0.2. Based on this structure, the first covering The height of the section 31 on the side plate 10 may correspond to the pole height of the battery pack 50, and the structural adhesive layer 13 under the first cladding section 31 has a larger bonding surface to be bonded to the side of the battery pack 50, The bonding structure is more stable; and the first cladding section 31 uses less material and lower cost.

Further, the end of the first insulating layer 30 is spaced apart from the end of the side plate 10 , that is, the first insulating layer 30 does not extend to the end of the 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 uses multiple battery packs 50 in series or connects multiple parallel battery packs 50 in series, and no matter which assembly method is used, the position of the battery pack 50 near the end plate 40 has The end plate 40 conducts heat directly, so when thermal runaway occurs in a group or a battery pack 50 near the end plate 40, the high temperature generated can also be quickly derived from the end plate 40, so that the battery pack 50 near the end plate 40 is not easy to There are cases where the second insulating layer 20 fails due to high temperature.

Considering the material cost of the first insulating layer 30, the distance between the extended length of the first insulating layer 30 and the side plate 10 can be the width of a group of battery packs 50 or the width of a battery pack 50 at the position of the end plate 40. The width only needs to be sufficient, so that the first insulating layer 30 can be concentrated on multiple battery packs 50 or multiple battery packs 50 in the middle.

Further, a heat insulating pad is provided between two adjacent battery packs 50, and the heat insulating pad can form an insulating and heat insulating frame with the first insulating layer 30 on the side plate 10, and can connect two adjacent battery packs. The heat generated between the 50 is further separated to realize thermal isolation and reduce thermal runaway of the battery pack 50 due to heat concentration.

And because the end plate 40 itself can directly conduct heat to dissipate heat, so no heat insulation pad is provided between the battery pack 50 stacked close to the end plate 40 and the end plate 40, so the end of the first insulating layer 30 can be extended. To the position corresponding to the heat insulation pad closest to the end plate 40 (that is, the heat insulation pad between the outermost battery of the same battery pack 50 and the adjacent battery), so that the first insulation Layer 30 maximizes the insulating area without wasting material.

Further, in this embodiment, the above-mentioned first insulating layer 30 is a ceramic composite tape, and the ceramic composite tape is composed of fiber cloth and ceramic silicon rubber. It should be noted that during the use of the battery pack 50 of the battery module, when thermal runaway occurs, a high temperature will be generated locally, so the ceramic silicone rubber can withstand a temperature as high as 800°C by setting a ceramic composite tape structure. Above, so that failure will not occur when thermal runaway occurs.

At the same time, since the fiber cloth not only has a smooth surface, but also has the characteristics of high strength, light weight and high temperature resistance, then the fiber cloth can be used as the coating basis to attach ceramic silicone rubber to the fiber cloth. It has high temperature resistance, so the formed first insulating layer 30 can withstand high temperature, and the high temperature generated when the battery pack 50 suffers thermal failure is not enough to cause the first insulating layer 30 to fail, so the insulating performance is more stable. The fiber cloth is resistant to high temperature, and will not be aged due to the high temperature environment inside the battery frame during battery use, so the formed first insulating layer 30 is not easy to fail.

In addition, due to the smooth surface of the fiber cloth, when the battery pack 50 is in contact with the first insulating layer 30 on the side plate 10, the smooth surface of the fiber cloth will not scratch the battery pack 50 when in contact with the battery pack 50, and the battery pack 50 will be reduced in size. The battery pack 50 rubs against the surface of the first insulating layer 30 . Even if the battery pack 50 vibrates up and down during use, the first insulating layer 30 is not easily detached during the vibration process.

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

Further, the insulation resistance of the first insulating layer 30 in this embodiment is 10MΩ, and on the basis of the structure that the insulation resistance of the first insulating layer 30 is 10MΩ, the first insulating layer 30 can withstand the temperature of the battery pack 50 High temperature at pole position.

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

Example 2,

The difference between the battery module in this embodiment and the battery module in Embodiment 1 is that a second insulating layer 20 can be provided on the inner surface of the side plate 10 of the battery module, and the first insulating layer 30 can be coated on The long sides of any one side of the side panel 10. Specifically, the insulation resistance of the first insulating layer 30 is higher than the insulation resistance of the second insulating layer 20 .

It should be noted that the inside of the side plate 10 indicated in this embodiment is the side close to the battery pack 50 during assembly, while the outside of the side plate 10 may refer to the side facing away from the battery pack 50 after assembly, that is, exposed to the battery pack 50. outside the frame.

When the battery module is assembled, generally a plurality of battery packs 50 are assembled into a battery frame composed of side plates 10 and end plates 40, and after assembly, the extension of the side plates 10 in the direction in which the multiple battery packs 50 are arranged The side is the long side, so the above-mentioned second insulating layer 20 can be covered 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 can be in contact with the side of the battery pack 50 to realize insulation. . When the battery pack 50 is in normal use, the temperature of the battery pack 50 will not be too high, so neither the second insulating layer 20 nor the first insulating layer 30 will experience insulation failure.

Since the battery pack 50 is in use, generally there will be an excessive voltage at the pole position for conducting electricity between two adjacent groups of battery packs 50, and the pole position is close to the side plate 10, so the side plate 10 is in contact with the pole. The distance between the pillars is relatively short, which is easy to be broken down and form a short circuit, thereby causing a large area of thermal runaway. At the same time, the second insulating layer 20 may fail due to high heat, so the side plate 10 The first insulating layer 30 is coated on the long side of the second insulating layer 20. Since the insulation resistance temperature of the first insulating layer 30 is relatively high, the first insulating layer 30 provided can play a role of high temperature insulation on the outside of the second insulating layer 20. , isolate the high temperature from the second insulating layer 20 , prevent breakdown and failure of the second insulating layer 20 under high temperature conditions, and achieve better insulation effect.

In addition, since the first insulating layer 30 is covered 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 this embodiment, the top of the side plate 10 can be coated with the first insulating layer 30, that is, the first insulating layer 30 can be distributed on the top of the side plate 10, and the top of the side plate 10 can also be distributed. Can have two ways:

The first way is that a space can be set between the top of the second insulating layer 20 and the top of the side plate 10, and the first insulating layer 30 can be set at a space between the top of the second insulating layer 20 and the top of the side plate 10, And 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 surface of the side plate 10 . On the basis of this structure, the area of the insulating layer on the inner surface of the side plate 10 is formed by the second insulating layer 20 and the first insulating layer 30 distributed up and down, and the first insulating layer 30 and the second insulating layer 20 do not overlap and cover In this case, the resulting insulating layer is thinner as a whole.

The second method is that the top of the second insulating layer 20 is directly covered on the top of the side plate 10 to be flush with the top of the second insulating layer 20 , while the first insulating layer 30 can be covered on the top of the second insulating layer 20 . On the basis of this structure, the top of the insulating layer on the inner surface of the side plate 10 has the first insulating layer 30 and the second insulating layer 20 overlapped and covered at the top, so the insulating layer at the top is thicker.

In actual use, since the poles used for electrical connection between two adjacent battery packs 50 are generally set on the top of the battery pack 50, the temperature of the battery pack 50 will be reduced during the thermal runaway of the battery pack 50 or during use. Generally, the temperature of the pole at the top is relatively high, so thermal runaway of the battery pack 50 is likely to occur at the top. In this embodiment, since the top of the side plate 10 is in contact with the battery pack 50 through the first insulating layer 30 with a relatively high insulation resistance, when the battery pack 50 is thermally out of control, the first insulating layer 30 will not appear due to high temperature. In case of failure, the bottom end of the battery pack 50 can be insulated by the second insulating layer 20 .

The second insulating layer 20 and the first insulating layer 30 are arranged in the above-mentioned manner because the higher the insulation resistance of the insulating material, the higher the material cost, so the present embodiment only arranges the first insulating layer 30 at the top of the side plate 10. Yes, cost savings.

Compared with the first method, the thickness of the insulating layer at the top of the second method is thicker, that is, the thickness of the insulating layer at the top of the side plate 10 is increased, thereby increasing the creepage distance at the top of the side plate 10 to prevent thermal runaway at the side. Breakdown occurs at the top of the board 10, so the insulation effect will be better.

It should be noted that the above-mentioned first insulating layer 30 may also be made of 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, the second insulation formed by high-temperature-resistant rubber pads needs to be connected by other structures, such as glue, or assembled by screws. In short, the rubber pads can be covered on the side Plate 10 is acceptable.

Example 3,

In this embodiment, a battery pack can be provided, refer to Figures 1-7, including a battery case and the battery module in Embodiment 1 or Embodiment 1, when the battery module is assembled, several battery packs 50 are assembled Into the battery frame composed of the side plate 10 and the end plate 40, and after assembly, the battery module can be assembled into the battery box.

Since the battery pack 50 is in use, generally there will be an excessive voltage at the pole position used for conduction between two adjacent groups of battery packs 50, and the pole position is close to the side plate 10, so the top of the side plate 10 The distance between the pole and the pole is short, and it is most likely to be broken down to form a short circuit, thereby causing a large area of thermal runaway. At the same time as the thermal runaway, it is possible to set the first insulating layer 30 on the top of the side plate 10 body to directly High-temperature insulation is carried out when thermal runaway occurs at the pole position to prevent short circuit at this position from causing thermal runaway at other positions, and the insulation effect is better. In addition, the application of insulating materials can be reduced to save costs.

For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and ideas described above, and all these changes and deformations should fall within the protection scope of the claims of the present utility model.

Claims (18)

1. A battery module, comprising a side plate (10) and a battery pack (50) formed by stacking several batteries; it is characterized in that, The side plate (10) is provided with a first insulating layer (30), and the first insulating layer (30) covers at least part of the side plate (10) close to the pole of the battery pack (50) end; the resistance R and thickness d of the first insulating layer satisfy, R/d≥10MΩ/mm, wherein the thickness satisfies 0.1mm≤d≤1mm. 2. The battery module according to claim 1, characterized in that, the first insulating layer (30) comprises a first covering segment (31) and a second covering segment (32), and the first covering The covering section (31) covers the inner surface of the side plate (10), the second covering section (32) is connected to the top surface of the side plate (10) and is connected with the first covering Section (31) is connected. 3. The battery module according to claim 2, characterized in that there are two first covering sections (31), and the top ends of the two first covering sections (31) are connected to the second On both sides of the cladding section (32), one of the first cladding sections (31) is clad on the inner surface of the side plate (10), and the other first cladding section (31) is clad on the side The outer side of the plate (10). 4. The battery module according to claim 1, wherein the side plate (10) comprises a side plate body and a folded edge bent from the side plate body toward the pole of the battery pack (50) (11); the first insulating layer (30) includes a second covering segment (32), and the second covering segment (32) partially covers the folded edge (11). 5. The battery module according to claim 4, characterized in that, the second covering section (32) covers the inner surface, the top surface and the bottom surface of the folded edge (11). 6. The battery module according to claim 4, characterized in that, the first insulating layer (30) further comprises a first covering section (31), and the first covering section (31) partially covers on the inner side and/or outer side of the side plate body. 7. The battery module according to claim 6, characterized in that, the second covering section extends toward the side plate body and is partially connected with the first covering section (31). 8. The battery module according to claim 4, characterized in that, along the battery stacking direction, the end of the folded edge (11) on at least one side of the side plate is spaced apart from the end of the side plate body And a notch (12) is formed at the top of the side plate (10); the end of the second cladding 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, characterized in that, the bottom end surface of the first cladding section (31) and the bottom end surface of the side plate (10) arranged at intervals; the inner surface of the side plate (10) is coated with a structural adhesive layer (13); the structural adhesive layer (13) is filled between the bottom end surface of the first cladding section (31) and the side In the gap between the bottom end surfaces of the plates (10), and bonded to the sides of the battery pack (50). 10. The battery module according to claim 7, characterized in that, the projected area of the first covering section (31) on the side of the battery pack (50) is S1, and the battery pack (50) The side area is S2, S1≤S2*0.2. 11. The battery module according to claim 1, characterized in that, the battery module further comprises an end plate (40); the end plate (40) and the side plate (10) are fixed to form a battery cavity, Several battery packs (50) are installed in the battery cavity. 12. The battery module according to claim 11, characterized in that, a thermal insulation pad is provided inside the battery pack; the end of the first insulating layer (30) extends to the battery close to the end plate (40) Set of (50) heat insulation pads. 13. The battery module according to claim 1, wherein the first insulating layer (30) is a ceramic composite tape; the ceramic composite tape includes fiber cloth and ceramic silicon rubber, and the ceramic silicon rubber is coated with Cover the fiber cloth. 14. The battery module according to claim 1, characterized in that, the insulation resistance of the first insulating layer (30) is 10 MΩ, and the withstand temperature of the first insulating layer (30) is not lower than 800 ^° C ; The thickness of the first insulating layer (30) is 0.3mm-0.4mm. 15. The battery module according to any one of claims 1-8, characterized in that, the inner surface of the side plate (10) is provided with a second insulating layer (20), and the first insulating layer (30) ) insulation resistance is higher than the insulation resistance value of the second insulation layer (20). 16. The battery module according to claim 15, characterized in that, the top surface of the second insulating layer (20) is spaced apart from the top surface of the side plate (10); the first insulating layer (30) It is covered on the top of the side plate (10) and connected with the top of the second insulating layer (20). 17. The battery module according to claim 15, characterized in that, the top surface of the second insulating layer (20) extends to the top of the side plate (10), and the first insulating layer (30) coated on the top of the second insulating layer (20). 18. A battery pack, characterized by comprising a battery case and the battery module according to any one of claims 1-17, the battery module being installed in the battery case.

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