Gasket, battery module and battery pack

Abstract

The utility model provides a gasket, a battery module and a battery. The battery module comprises a plurality of single batteries and a plurality of gaskets, the gaskets are arranged between any two adjacent single batteries, and the gaskets can be in contact with the surfaces of the single batteries after being heated and melted. The utility model aims to provide the battery module capable of preventing thermal runaway and thermal diffusion.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a gasket, battery module and battery pack. BACKGROUND

[0002] For the battery pack, the single battery inside the battery module inside the battery pack causes uncontrollable temperature rise due to internal heat release reaction, which is called thermal runaway. When the heat generated by the battery module is higher than the heat it can dissipate, thermal runaway will occur. When a single battery in the battery pack has a problem, thermal runaway of other cells is triggered by thermal runaway of a single cell, which is called thermal runaway diffusion, which can be simply called thermal diffusion. In the related art, a cooling device is often provided in the battery pack to cool the battery module in the battery pack to avoid excessive temperature, but it cannot solve the problem of thermal diffusion. SUMMARY

[0003] Embodiments of the utility model provide a gasket, a battery module and a battery pack, aiming to provide a battery module capable of preventing thermal runaway and thermal diffusion.

[0004] In a first aspect, embodiments of the utility model provide a battery module, comprising:

[0005] a plurality of single batteries; and

[0006] a plurality of gaskets, the gaskets being arranged between any two adjacent single batteries, and the gaskets being arranged to be capable of contacting the surface of the single battery after being heated and melted.

[0007] In an embodiment, the gasket comprises a core material layer and an encapsulation layer, the encapsulation layer being wrapped on the outside of the core material layer, the encapsulation layer being in contact with the surface of the single battery, and at least part of the encapsulation layer being melted to allow the core material layer to wrap the surface of the single battery.

[0008] In an embodiment, at a first temperature, the core material layer is in a fluid state, at a second temperature, at least part of the encapsulation layer is melted, and at a third temperature, the core material layer is solidified, the first temperature being lower than the second temperature, and the second temperature being lower than the third temperature.

[0009] In an embodiment, the first temperature is T1, the second temperature is T2, and the third temperature is T3, T1 < 60℃, 60 ≤ T2, and T3 ≥ 100℃.

[0010] In an embodiment, the encapsulation layer comprises a first side portion and a second side portion adjacent to each other, the first side portion being in contact with the surface of the single battery, and the melting point of the first side portion being higher than that of the second side portion.

[0011] In an embodiment, the softening temperature of the first side portion is T4, 400℃≤T4≤1000℃.

[0012] In an embodiment, the thickness of the core layer is H1, the thickness of the first side portion is H2, H2 / H1=(0.05-0.1):1; and / or,

[0013] The thickness of the core layer is H1, the thickness of the second side portion is H3, H3 / H1=(0.05-0.1):1.

[0014] In an embodiment, the core layer comprises resin;

[0015] The first side portion comprises any one of fireproof cloth, nylon, polyamide imide;

[0016] The second side portion comprises polyethylene film.

[0017] In an embodiment, the thermal conductivity of the first side portion is lower than that of the core layer.

[0018] In an embodiment, two spacers are arranged between any two adjacent single batteries;

[0019] The battery module further comprises a plurality of heat insulation pads arranged between two spacers.

[0020] In an embodiment, the heat insulation pad comprises any one of fireproof cloth, nylon, polyamide imide.

[0021] In a second aspect, embodiments of the utility model provide a battery pack comprising a plurality of battery modules as described above. The battery module comprises:

[0022] A plurality of single batteries; and,

[0023] A plurality of spacers arranged between any two adjacent single batteries, the spacers being arranged to wrap the surface of the single battery after being heated and melted.

[0024] In an embodiment, further comprising a cooling device, a plurality of battery modules are connected with the cooling device, and the spacers are filled between the single batteries and the cooling device after being heated and melted.

[0025] In an embodiment, the cooling device comprises a plurality of second cooling plates, and one second cooling plate is arranged between two adjacent battery modules.

[0026] In an embodiment, the cooling device comprises a first cooling plate, and a plurality of battery modules are arranged on the first cooling plate, and the spacers are filled in the gap between the single batteries and the first cooling plate after being heated and melted.

[0027] In an embodiment, the cooling device further comprises a plurality of second cooling plates, the plurality of second cooling plates are arranged on the first cooling plate, one second cooling plate is arranged between any two adjacent battery modules, and the gasket is filled in the gap between the single battery and the plurality of second cooling plates after being melted by heat.

[0028] In an embodiment, the gasket is connected between the single battery and the first cooling plate, and is also connected between the single battery and the plurality of second cooling plates after being melted by heat.

[0029] In an embodiment, a plurality of temperature sensors are further included, each temperature sensor is arranged on each single battery to monitor the temperature of the corresponding single battery.

[0030] In a third aspect, an embodiment of the utility model provides a gasket for a battery module, the gasket is the gasket in the battery module as described above.

[0031] The embodiment of the utility model has the advantages of:

[0032] In the technical scheme of the utility model, when the battery module works normally, the gasket is arranged between any two adjacent single batteries to insulate the single batteries, so that heat of the adjacent two single batteries is not transferred to each other, and temperature is not increased, thereby avoiding thermal runaway; when the temperature of the battery module is increased, the gasket is melted by heat, and the melted gasket is wrapped on the surface of the single battery, so that the single batteries are separated from each other, and thermal runaway is avoided from spreading, so that when thermal runaway occurs in a single battery, the gasket adjacent to the single battery is melted by heat and wrapped on the outer surface of the single battery, so that the single battery is separated from other single batteries, thereby avoiding thermal runaway from spreading to other single batteries, and the safety of the battery module is improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed in the embodiment description will be briefly introduced as follows, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the drawings without creative labor for those skilled in the art.

[0034] FIG. 1 It is a structural schematic view of an embodiment of the battery module provided by the utility model;

[0035] FIG. 2 It is FIG. 1 the enlarged schematic view of A in the figure;

[0036] FIG. 3 It isFIG. 1 Structure diagram of the middle gasket, the heat insulation gasket and the single battery fitting;

[0037] FIG. 4 Is FIG. 1 Sectional view of the middle gasket;

[0038] FIG. 5 Structure diagram of an embodiment of the battery pack provided by the utility model;

[0039] FIG. 6 Is FIG. 5 Structure diagram of an embodiment of the cooling device;

[0040] FIG. 7 Is FIG. 6 Sectional view of the second cooling plate;

[0041] FIG. 8 Is FIG. 7 Enlarged diagram of B.

[0042] Explanation of reference numerals

[0043] Reference Name Reference Name 1000 Battery pack 21 First side 100 Battery module 22 Second side a Single battery 20 Thermal insulation pad 10 Gasket 200 Cooling device 1 Core material layer 201 First cooling plate 2 Encapsulation layer 202 Second cooling plate c1 First side edge c2 Second side edge d Flow channel e1 Partition plate e2 First plate e3 Second plate 300 Box 400 BMS control system 500 Collection line DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model. In addition, it should be understood that the specific embodiments described herein are only used for illustrating and explaining the utility model, and are not used for limiting the utility model. In the utility model, the orientation words such as 'up' and 'down' generally refer to the up and down in the actual use or working state of the device, and specifically refer to the drawing direction in the drawings, and 'inner' and 'outer' refer to the outline of the device.

[0045] For the battery pack, the uncontrolled temperature rise phenomenon caused by the heat release reaction inside the single battery inside the battery module inside the battery pack is called thermal runaway. When the heat generated by the battery module is higher than the heat that can be dissipated, thermal runaway will occur. When a problem occurs in a single battery in the battery pack, thermal runaway of other cells is triggered by thermal runaway of a single cell, which is thermal runaway diffusion, which can be simply referred to as thermal diffusion. In the related art, a cooling device is often arranged in the battery pack to cool the battery module in the battery pack to avoid the case that the temperature is too high, and the problem of thermal diffusion cannot be solved.

[0046] In view of this, the utility model provides a battery module 100, FIG. 1 to FIG. 4 The utility model provides an embodiment structure schematic diagram of battery module 100, the utility model provides battery module 100, and good heat dissipation can prevent heat diffusion, and higher security;The following will be combined with main drawing to carry out detailed explanation to battery module 100.

[0047] Please refer to FIG. 1 And FIG. 2 Battery module 100 includes multiple single cell batteries a and multiple gaskets 10;Gasket 10 is arranged between any two adjacent single cell batteries a, and the gasket 10 is arranged to be capable of wrapping the surface of the single cell battery a after being heated and melted.

[0048] In the technical scheme of the utility model, when the battery module 100 is working normally, the gasket 10 is arranged between any two adjacent single cell batteries a, and the single cell battery a is heat insulated, so that the heat of the two adjacent single cell batteries a is not transmitted to each other, the temperature is increased, and the thermal runaway is avoided;When the temperature of the battery module 100 is increased, the gasket 10 is heated and melted, and the melted gasket 10 is wrapped on the surface of the single cell battery a, so that the single cell batteries a are separated from each other, the thermal runaway is avoided, and the safety of the battery module 100 is improved.

[0049] In the actual working process of the battery module 100, one single cell battery a may have a problem, or multiple single cell batteries a may have problems. When one single cell battery a in the battery module 100 has a problem and thermal runaway occurs, the temperature of the single cell battery a rises rapidly, the gasket 10 adjacent to the single cell battery a is affected by the temperature and is heated and melted, and the melted gasket 10 is wrapped on the surface of the single cell battery a, so that the single cell battery a is isolated from other single cell batteries a, and the thermal runaway is prevented from spreading among the single cell batteries a. When multiple single cell batteries a in the battery module 100 have thermal runaway, the temperature of the entire battery module 100 starts to rise, multiple gaskets 10 are affected by the temperature and are melted, and the melted gaskets 10 are wrapped on the surfaces of the multiple single cell batteries a, so that the multiple single cell batteries a are separated from each other, and the thermal runaway is prevented from spreading among the single cell batteries a.

[0050] In the embodiment, the gasket 10 can realize the heat insulation function, avoid the heat transmission among the single cell batteries a, and cause the thermal runaway to be aggravated, and also can play a buffering protection role, when the battery module 100 is impacted, the gasket 10 can absorb part of the impact force, so that the single cell battery a is prevented from being extruded and deformed.

[0051] It should be noted that the gasket 10 has two states, when the battery module 100 is working normally, the gasket 10 is in the first state, arranged between two single batteries a, and the gasket 10 is attached to the surface of the adjacent two single batteries a, when the battery module 100 is in thermal runaway, the gasket 10 is in the second state, that is, part of the gasket 10 is melted by heat, and the melted part of the gasket 10 is wrapped around the surface of the single battery a. In the first state, the gasket 10 is used to isolate the adjacent two single batteries a, to avoid heat transfer between the adjacent two single batteries a, thereby avoiding the local temperature of the battery module 100 being too high, and in the second state, the melted part of the gasket 10 is wrapped around the surface of the single battery a, to avoid the thermal runaway from being intensified.

[0052] Please refer to FIG. 3 and FIG. 4 , the gasket 10 includes a core material layer 1 and an encapsulation layer 2, the encapsulation layer 2 is wrapped outside the core material layer 1, and the encapsulation layer 2 is attached to the surface of the single battery a; in this embodiment, the function of the encapsulation layer 2 is to prevent heat transfer between the adjacent two single batteries a, and the function of the core material layer 1 is to wrap around the surface of the single battery a. Specifically, when the battery module 100 is working normally, the core material layer 1 is wrapped in the encapsulation layer 2, and the functions of the two at this time are to prevent heat transfer between the adjacent two single batteries a. When the thermal runaway occurs in the battery module 100, at least part of the encapsulation layer 2 is affected by the temperature rise and begins to melt, causing the core material layer 1 in the encapsulation layer 2 to flow out, and the core material layer 1 after flowing out wraps around the surface of the single battery a, thereby isolating the single battery a and preventing the thermal runaway from being further intensified.

[0053] Further, in some embodiments, at a first temperature, the core material layer 1 is in a fluid state, at the first temperature, the core material layer 1 is wrapped in the encapsulation layer 2, therefore, even if the core material layer 1 is in a fluid state, it will not affect its function; at a second temperature, at least part of the encapsulation layer 2 melts, at the second temperature, part of the encapsulation layer 2 melts, and the core material layer 1 in the encapsulation layer 2 flows out, since the core material layer 1 is in a fluid state, the flowed-out core material layer 1 can cover the surface of the single battery a. At a third temperature, the core material layer 1 solidifies, as the temperature of the battery module 100 rises, the core material layer 1 gradually begins to solidify until it completely wraps around the surface of the single battery a, thereby achieving the isolation of the single battery a. It should be noted that the specific temperature ranges of the first temperature, the second temperature and the third temperature can be set according to the specific type of the single battery a, the type of the single battery a is different, the temperature of the thermal runaway is different, further, the first temperature is lower than the second temperature, and the second temperature is lower than the third temperature.

[0054] In the embodiment, the single battery a is mainly a lithium iron phosphate battery, therefore, the first temperature is T1, the second temperature is T2, and the third temperature is T3, T1<60℃, 60≤T2, and T3≥100℃. When the temperature of the battery module 100 is lower than 60℃, the core material layer 1 is in a fluid state, and is wrapped in the packaging layer 2. The core material layer 1 has a certain fluidity before being excited to solidify, so as to ensure that it can flow out of the packaging layer 2. When the temperature of the battery module 100 gradually rises to above 60℃, part of the packaging layer 2 melts, the core material layer 1 in the packaging layer 2 flows out, and is wrapped on the surface of the single battery a. At this time, the temperature of the battery module 100 continues to rise. When the temperature of the battery module 100 is greater than 100℃, the core material layer 1 wrapped on the surface of the single battery a starts to solidify, thereby isolating the plurality of single batteries a from each other.

[0055] Please refer to FIG. 4 The packaging layer 2 includes an adjacent first side portion 21 and a second side portion 22. The first side portion 21 is attached to the surface of the single battery a. In the embodiment, the first side portion 21 is used to attach to the surface of the single battery a, and mainly functions to isolate heat and avoid the mutual transmission of the temperature of the single battery a. When the temperature rises, the second side portion 22 needs to melt so that the core material layer 1 in the packaging layer 2 flows out. Therefore, in order to achieve the above functions, the melting point of the first side portion 21 needs to be greater than the melting point of the second side portion 22. At the same time, the softening temperature of the second side portion 22 needs to be less than the excitation solidification temperature of the core material layer 1. If the softening temperature of the second side portion 22 is greater than the excitation solidification temperature of the core material layer 1, the core material layer 1 will solidify when it still flows out of the packaging layer 2, and the function of isolating the single battery a cannot be achieved.

[0056] It should be noted that the core material layer 1 has a certain fluidity before being excited to solidify, so as to enable it to flow out of the packaging layer 2. In fact, the first side portion 21 and the second side portion 22 form a containing cavity, and the core material layer 1 is packaged in the containing cavity. During the packaging process, the core material layer 1 needs to completely fill the entire containing cavity.

[0057] In some embodiments, the softening temperature of the first side portion 21 is greater than the softening temperature of the second side portion 22, and the softening temperature of the first side portion 21 is greater than the excitation solidification temperature of the core material layer 1. The softening temperature of the second side portion 22 is lower than the excitation solidification temperature of the core material layer 1. Further, the softening temperature of the first side portion 21 is T4, 400℃≤T4≤1000℃. The softening temperature of the second side portion 22 is T5, 60℃≤T5≤80℃. The excitation solidification temperature of the core material layer 1 is T6, T6≥100℃.

[0058] The specific working principle of the gasket 10 is as follows: when the temperature of the battery module 100 reaches 60-80°C, the second side portion 22 begins to soften (the first side portion 21 remains unchanged), the core material layer 1 in the encapsulation layer 2 flows out, covering the surface of the single battery a, and as the temperature of the battery module 100 gradually rises, the degree of softening of the second side portion 22 increases, gradually reaching the melting point of 100°C or above, the second side portion 22 melts, and the core material layer 1 begins to solidify, being fixed on the single battery a and separating the plurality of single batteries a.

[0059] It should be noted that the principle of setting the proportions among the core material layer 1, the first side portion 21, and the second side portion 22 is that the width of the second side portion 22 is set according to the spacing between the single batteries a, the width of the first side portion 21 is equal to the width of the single battery a, the amount of the core material layer 1 required to fill the space in the encapsulation layer 2 is equal to the space volume of the spacing between the single batteries a, and the core material layer 1 has a compressed state.

[0060] In some embodiments, the thickness of the core material layer 1 is H1, the thickness of the first side portion 21 is H2, and H2 / H1=(0.05-0.1):1; it should be noted that when H2 / H1 is less than 0.05, the thickness of the first side portion 21 is too thin and is easily damaged during use, causing the core material layer 1 to flow out and affecting the normal operation of the battery module 100. When H2 / H1 is greater than 0.1, the thickness of the first side portion 21 is relatively thick, increasing the occupied space. More specifically, the thickness of the first side portion 21 is 0.05-0.1 mm, and H2 can be 0.05 mm, 0.052 mm, 0.055 mm, 0.058 mm, 0.06 mm, 0.061 mm, 0.065 mm, 0.069 mm, 0.07 mm, 0.072 mm, 0.075 mm, 0.078 mm, 0.08 mm, 0.085 mm, 0.086 mm, 0.087 mm, 0.088 mm, 0.09 mm, 0.091 mm, 0.092 mm, 0.093 mm, 0.098 mm, 0.099 mm, 0.1 mm, or other data not listed.

[0061] The thickness of the core material layer 1 is 0.6-1.4 mm, and more specifically, H1 can be 0.6 mm, 0.62 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.88 mm, 0.89 mm, 0.9 mm, 0.91 mm, 0.92 mm, 0.95 mm, 0.99 mm, 1 mm, 1.1 mm, 1.15 mm, 1.18 mm, 1.2 mm, 1.22 mm, 1.25 mm, 1.29 mm, 1.3 mm, 1.33 mm, 1.35 mm, 1.36 mm, 1.38 mm, 1.4 mm, or other data not listed.

[0062] In some embodiments, the thickness of the core material layer 1 is H1, the thickness of the second side portion 22 is H3, and H3 / H1=(0.05-0.1):1. It should be noted that when H3 / H1 is less than 0.05, the thickness of the second side portion 22 is too thin, which is prone to breakage during use, resulting in the core material layer 1 flowing out and affecting the normal operation of the battery module 100. When H3 / H1 is greater than 0.1, the thickness of the second side portion 22 is relatively thick, and the space occupied is increased. More specifically, the thickness of the second side portion 22 is 0.05-0.1 mm, and H3 can be 0.05 mm, 0.052 mm, 0.055 mm, 0.058 mm, 0.06 mm, 0.061 mm, 0.065 mm, 0.069 mm, 0.07 mm, 0.072 mm, 0.075 mm, 0.078 mm, 0.08 mm, 0.085 mm, 0.086 mm, 0.087 mm, 0.088 mm, 0.09 mm, 0.091 mm, 0.092 mm, 0.093 mm, 0.098 mm, 0.099 mm, 0.1 mm, or other data not listed.

[0063] In some embodiments, considering the problem of space utilization, the overall thickness of the gasket 10 is 0.8-1.5 mm, and specifically, the overall thickness of the gasket 10 can be 0.8 mm, 0.82 mm, 0.85 mm, 0.88 mm, 0.9 mm, 0.91 mm, 0.92 mm, 0.95 mm, 0.98 mm, 1 mm, 1.05 mm, 1.08 mm, 1.1 mm, 1.11 mm, 1.12 mm, 1.15 mm, 1.16 mm, 1.18 mm, 1.2 mm, 1.22 mm, 1.25 mm, 1.26 mm, 1.27 mm, 1.3 mm, 1.31 mm, 1.35 mm, 1.36 mm, 1.38 mm, 1.4 mm, 1.42 mm, 1.44 mm, 1.45 mm, 1.48 mm, 1.5 mm, or other data not listed.

[0064] In some embodiments, the core material layer 1 comprises a resin; the resin has weak adhesion and micro-flow characteristics below 70°C, can flow out from the packaging layer 2 after the second side portion 22 melts, and gradually solidifies when the temperature reaches 100°C or above. More specifically, the resin can be selected from epoxy resin.

[0065] In some embodiments, the first side portion 21 comprises any one of fireproof cloth, nylon, and polyamide imide; the above-mentioned materials can withstand high temperatures of 400-1200°C, have low thermal conductivity, excellent high-temperature insulation performance, high tensile strength, and long service life, and can isolate the transmission of heat when the battery module 100 experiences thermal runaway, thereby avoiding the intensification of thermal runaway.

[0066] In some embodiments, the second side portion 22 comprises a polyethylene film. The polyethylene film has good chemical stability, the material cohesive molecules are connected by carbon-carbon single bond, can resist the erosion of most acids and bases (not resistant to acid with oxidizing properties), and is insoluble in general solvents at room temperature, has small water absorption, and has excellent electrical insulation.

[0067] In the present embodiment, in order to avoid the heat runaway exacerbation, the thermal conductivity of the first side portion 21 is lower than the thermal conductivity of the core material layer 1.

[0068] Please refer to FIG. 3 In the present embodiment, the battery module 100 further comprises a plurality of heat insulation pads 20, two spacers 10 are arranged between any two adjacent single batteries a, and the heat insulation pad 20 is arranged between the two spacers 10. In this way, the safety of the battery module 100 is improved, the heat insulation pad 20 and the spacer 10 are arranged to insulate heat, so as to avoid heat transfer between the adjacent two single batteries a, thereby improving the safety of the battery module 100.

[0069] Further, the heat insulation pad 20 comprises any one of fireproof cloth, nylon, and polyamide imide. The above-mentioned materials can resist high temperature of 400-1200 DEG C, have low thermal conductivity, excellent high-temperature insulation performance, high tensile strength, and long service life, and can insulate heat transfer when the battery module 100 has heat runaway, thereby avoiding heat runaway exacerbation.

[0070] The utility model further provides a battery pack 1000, please refer to FIG. 5 to FIG. 8 The battery pack 1000 comprises the above-mentioned battery module 100. The specific structure of the battery module 100 is referred to the above-mentioned embodiments. Since the battery pack 1000 adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0071] In some embodiments, please refer to FIG. 5 and FIG. 6In order to avoid thermal runaway of the battery pack 1000, the cooling device 200 is arranged in the battery pack 1000, and the plurality of battery modules 100 are connected with the cooling device 200. In actual working process, the cooling device 200 is used for cooling the battery modules 100, so as to avoid that the temperature of the battery modules 100 is too high. In the embodiment, the gasket 10 is arranged between the single batteries a of the battery module 100. When the battery pack 1000 works normally, the gasket 10 is used for isolating the single batteries a, so as to avoid that the temperature is transferred between the single batteries a, thereby avoiding that the temperature of a single battery a is too high and causes thermal runaway. When the temperature of the battery pack 1000 rises, the gasket 10 melts under heat and fills the gap between the single batteries a and the cooling device 200. At this time, the gasket 10 is used as a bridge structure to connect the single batteries a and the cooling device 200. The temperature of the single batteries a is quickly transferred to the cooling device 200 through the bridge structure, so as to achieve the purpose of rapid cooling and avoid that the thermal runaway is aggravated.

[0072] It should be noted that the specific type of the cooling device 200 is not limited, as long as the battery modules 100 can be cooled.

[0073] In some embodiments, the battery pack 1000 includes a box body 300, and a containing cavity is formed in the box body 300. The cooling device 200 includes a first cooling plate 201, and the first cooling plate 201 is arranged in the box body 300. The plurality of battery modules 100 are located on the first cooling plate 201, and a gap is formed between the bottom of the plurality of battery modules 100 and the first cooling plate 201. When the temperature of the battery pack 1000 rises, the gasket 10 melts under heat and fills the gap between the single batteries a and the first cooling plate 201.

[0074] Further, please refer to FIG. 6 In order to improve the cooling efficiency, the cooling device 200 further includes a plurality of second cooling plates 202, and one second cooling plate 202 is arranged between adjacent two battery modules 100. It should be noted that the first cooling plate 201 and the plurality of second cooling plates 202 can be selectively arranged, or can be simultaneously arranged, which can be selected according to actual conditions.

[0075] In some embodiments, the cooling device 200 only includes the first cooling plate 201, and the plurality of battery modules 100 are located on the first cooling plate 201 and are cooled by the first cooling plate.

[0076] In some other embodiments, the cooling device 200 only includes the plurality of second cooling plates 202, and one second cooling plate 202 is arranged between adjacent two battery modules 100, and the plurality of second cooling plates 202 are used for cooling.

[0077] In some embodiments, the cooling device 200 comprises the first cooling plate 201 and a plurality of second cooling plates 202, and specifically, the plurality of second cooling plates 202 are arranged on the first cooling plate 201, and the plurality of battery modules 100 are arranged on the first cooling plate 201, and one second cooling plate 202 is arranged between two adjacent battery modules 100. The gasket 10 is melted by heat and fills the gap between the single battery a and the plurality of second cooling plates 202.

[0078] It should be noted that in order to improve the cooling efficiency, the melted gasket 10 connects the plurality of single batteries a and the first cooling plate 201, and at this time, the gasket 10 acts as a “bridge” to quickly transfer the temperature of the single battery a to the first cooling plate 201, thereby improving the cooling efficiency. Similarly, the melted gasket 10 connects the plurality of single batteries a and the plurality of second cooling plates 202, and at this time, the gasket 10 acts as a “bridge” to quickly transfer the temperature of the single battery a to the second cooling plate 202, thereby improving the cooling efficiency.

[0079] It should be noted that in order to improve the thermal conductivity of the core layer 1, an initiator is often doped in the core layer 1.

[0080] In some embodiments, the core layer 1 is an epoxy resin, and by mixing aluminum or copper particles and other fillers with thermal conductivity in the epoxy resin, the thermal conductivity of the epoxy resin is improved, so that the epoxy resin can quickly transfer the heat of the single battery a to the first cooling plate 201 or the second cooling plate 202. The specific ratio and mixing preparation method of the epoxy resin and the filler can refer to the conventional settings in the art, which will not be described here.

[0081] In some other embodiments, the core layer 1 is an epoxy resin, and by adjusting the composition ratio of the epoxy resin, for example, increasing the cross-linking degree of the epoxy resin, reducing the distance between the molecular structures of the epoxy resin, improving the heat transfer efficiency, and improving the thermal conductivity of the epoxy resin, so that the epoxy resin can quickly transfer the heat of the single battery a to the first cooling plate 201 or the second cooling plate 202. The adjustment method of the composition ratio of the epoxy resin can refer to the conventional settings in the art, which will not be described here.

[0082] In some other embodiments, the core layer 1 is an epoxy resin, and by adding a heat conduction aid, such as adding graphite, carbon fiber and other high-thermal-conductivity compounds, the heat transfer efficiency is improved, thereby improving the thermal conductivity of the epoxy resin, so that the epoxy resin can quickly transfer the heat of the single battery a to the first cooling plate 201 or the second cooling plate 202. The specific operation method can refer to the conventional settings in the art, which will not be described here.

[0083] It should be noted that by adding other compounds to the core layer 1, the chemical properties of the core layer 1 are improved, so that the core layer 1 after curing forms a soft rubber-like material with excellent impact resistance; most importantly, the cured core layer 1 has very high thermal conductivity and electrical insulation. Specifically, the heat curing principle is: when the material is heated to high temperature, the curing agent in it undergoes thermal decomposition or thermal activation, releases active energy, and then initiates a curing reaction.

[0084] The specific working principle of the battery pack 1000 provided by the embodiment is as follows: when the battery pack 1000 is in thermal runaway, the core layer 1 flows out and fills the gap between the single battery a and the first cooling plate 201, and also fills the gap between the single battery a and the second cooling plate 202. The core layer 1 in a flowable state has an initiator mixed therein which expands and increases the internal pressure of the thermal conductive adhesive under the influence of temperature. When the battery pack 1000 is in the high-temperature initiation stage, i.e. the temperature in the battery pack 1000 reaches 60-100℃, the expansion initiator starts to work, the internal pressure of the core layer 1 is greater than the internal pressure of the battery pack 1000, and the flowable core layer 1 is ejected from the softened packaging layer 2 and contacts the first cooling plate 201 and the single battery a to form a lap joint, and also contacts the second cooling plate 202 and the single battery a to form a lap joint. The temperature in the battery pack 1000 continues to rise, and the temperature exceeds 100℃ (the development stage of thermal runaway of the battery pack 1000), at which time the core layer 1 gradually solidifies. When the battery pack 1000 is in thermal runaway, the core layer 1 forms a stable thermal-conductive-cooling lap joint with the first cooling plate 201 and the second cooling plate 202, the temperature of the single battery a is transmitted to the first cooling plate 201 and the second cooling plate 202 through the lap joint of the core layer 1, and the heat in the battery pack 1000 is diffused in a large amount, avoiding heat diffusion and fire.

[0085] In some embodiments, please refer to 7 and FIG. 8 , for example, the first direction in FIG. 7 , the second direction is perpendicular to the first direction in the horizontal plane, as FIG. 7As shown, the second cooling plate 202 is formed with a cavity for accommodating the cooling medium, and a plurality of partitions e1 are arranged in the cavity, the plurality of partitions e1 extend along the first direction and are arranged at intervals along the second direction, and the plurality of partitions e1 divide the cavity into a plurality of flow channels d. More specifically, the second cooling plate 202 includes a first side c1 and a second side c2 arranged opposite along the first direction, and adjacent two partitions e1 are a first plate e2 and a second plate e3, respectively, wherein one end of the first plate e2 is connected to the first side c1, and the other end of the first plate e2 is arranged at an interval from the second side c2 (i.e., a gap is directly formed between the other end of the first plate and the second side c2, and the gap can allow the cooling medium in the second plate to pass through), so that the flow channels d on both sides of the first plate e2 are communicated, one end of the second plate e3 is connected to the second side c2, and the other end of the second plate is arranged at an interval from the first side c1 (i.e., a gap is directly formed between the other end of the second plate and the first side c1, and the gap can allow the cooling medium in the second plate to pass through), and the other partitions e1 are arranged according to the above arrangement manner, so that the plurality of flow channels d are communicated between the head and tail, forming a serpentine flow channel d.

[0086] It should be noted that the size of the flow channel d can be controlled by controlling the distance between the adjacent two partitions e1, and in this embodiment, considering the cooling effect, one single battery a corresponds to at least two flow channels d, and more specifically, during the cooling process, as the cooling medium flows, the temperature of the cooling medium rises, i.e., the temperature of the cooling medium at the inlet end is higher than that at the outlet end. In this embodiment, the cooling medium in the second cooling plate 202 can flow through the same single battery a at least twice, thereby improving the cooling efficiency and avoiding overheating of the single battery a, which may cause thermal runaway.

[0087] It should be noted that the type of the cooling medium in the above embodiment is not limited, and can be selected according to the actual application. For example, the cooling medium can be lubricating oil, water, cold air, alcohol compounds, etc.

[0088] Further, each second cooling plate 202 is also communicated with the first cooling plate 201, i.e., the cooling medium in the second cooling plate 202 flows into the first cooling plate 201 after the cooling circulation is completed, and flows out of the first cooling plate 201, and the communication manner of the first cooling plate 201 and the plurality of second cooling plates 202 is not limited, and can be selected according to the actual situation, for example, two openings can be arranged on the second cooling plate 202, and corresponding inlets are arranged on the first cooling plate 201, and the two openings are connected with the two inlets respectively, so as to realize the communication. For example, an additional liquid delivery pipe can also be arranged, one end of the liquid delivery pipe is communicated with the second cooling plate 202, and the other end is connected to the first cooling plate 201, so as to communicate the first cooling plate 201 and the second cooling plate 202.

[0089] Please refer to FIG. 5 The battery pack 1000 further comprises a BMS control system 400, a collection line 500, etc., and the BMS control system 400 and the collection line 500 can be arranged and connected in a manner conventional in the art, which will not be described herein.

[0090] In some embodiments, the battery pack 1000 further comprises a plurality of temperature sensors electrically connected to the BMS system for transmitting detection signals to the BMS control system 400. Each temperature sensor is arranged on each single battery a, and each temperature sensor is used to monitor the temperature of the corresponding single battery a. When the temperature of the single battery a is abnormal, the temperature sensor transmits the abnormal temperature to the BMS control system 400, and the BMS control system 400 transmits an abnormal signal, so that the user can detect the abnormality in time, thereby avoiding danger.

[0091] Of course, when the battery pack 1000 works in winter or cold areas, in order to maintain the battery pack 1000 at an optimal working temperature of 25℃±3℃, the temperature of the cold medium in the first cooling plate 201 and the second cooling plate 202 can be regulated by the BMS control system 400 to heat the battery pack 1000, so that the environment in the battery pack 1000 is 25℃±3℃ (the principle is similar to heating in the north). When the temperature in the battery pack 1000 is lower than 20℃, the temperature sensor starts an alarm and transmits a message to the BMS control system 400, and the BMS control system 400 starts to heat the battery pack 1000.

[0092] The utility model also proposes a gasket 10, the gasket 10 is used in battery module 100. The gasket 10 is the gasket 10 in the battery module 100 in above -mentioned embodiment. The specific structure of gasket 10 refers to above -mentioned embodiment, because this gasket 10 adopts all technical schemes of above -mentioned all embodiments, therefore at least has all beneficial effects brought by the technical scheme of above -mentioned embodiment, here will not repeat.

[0093] In addition, the utility model also proposes a kind of electric equipment, and electric equipment includes battery pack 1000. The specific structure of battery pack 1000 refers to above -mentioned embodiment, because this electric equipment adopts all technical schemes of above -mentioned all embodiments, therefore at least has all beneficial effects brought by the technical scheme of above -mentioned embodiment, here will not repeat.

[0094] It can be understood that the electric device includes but is not limited to electric toys, electric tools, electric vehicles, cars, ships, spacecraft and the like. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric plane toys and the like, and the spacecraft can include airplanes, rockets, space shuttles and spaceships and the like. The car can be a fuel car, a gas car and a new energy car.

[0095] The above has carried out the detailed introduction to the embodiment of the utility model, the principle and the implementation mode of the utility model have been set forth in this article by applying specific examples, the above embodiment explanation is only for helping understanding the method of the utility model and its core thought; simultaneously, for the technical personnel of the field, according to the thought of the utility model, there will be changes in specific implementation mode and application range, and the above is described, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A battery module, characterized by, The battery module (100) comprises: a plurality of single batteries (a); and a plurality of pads (10) arranged between any two adjacent single batteries (a), the pads (10) being arranged to be capable of contacting the surfaces of the single batteries (a) after being heated and melted.

2. The battery module of claim 1, wherein, The pad (10) comprises a core material layer (1) and an encapsulation layer (2) wrapped outside the core material layer (1), the encapsulation layer (2) being in contact with the surface of the single battery (a), and the encapsulation layer (2) being at least partially melted by heat so that the core material layer (1) wraps the surface of the single battery (a).

3. The battery module of claim 2, wherein, The core material layer (1) is in a fluid state at a first temperature, at least part of the encapsulation layer (2) is melted at a second temperature, and the core material layer (1) is solidified at a third temperature, the first temperature being lower than the second temperature, and the second temperature being lower than the third temperature.

4. The battery module of claim 3, wherein, The first temperature is T1, the second temperature is T2, and the third temperature is T3, T1 < 60℃, 60≤T2, and T3≥100℃.

5. The battery module of claim 2, wherein, The encapsulation layer (2) comprises a first side portion (21) and a second side portion (22) adjacent to each other, the first side portion (21) being in contact with the surface of the single battery (a), and the melting point of the first side portion (21) being higher than that of the second side portion (22).

6. The battery module of claim 5, wherein, The softening temperature of the first side portion (21) is T4, 400℃≤T4≤1000℃.

7. The battery module of claim 5, wherein, The thickness of the core material layer (1) is H1, the thickness of the first side portion (21) is H2, and H2 / H1= (0.05~0.1):1; and / or The thickness of the core material layer (1) is H1, the thickness of the second side portion (22) is H3, and H3 / H1= (0.05~0.1):

1.

8. The battery module of any one of claims 5-7, wherein, The core material layer (1) comprises a resin; The first side portion (21) comprises any one of fireproof cloth, nylon, and polyamide-imide; The second side portion (22) comprises a polyethylene film.

9. The battery module of any one of claims 5-7, wherein, The thermal conductivity of the first side portion (21) is lower than that of the core material layer (1).

10. The battery module of claim 1, wherein, Two pads (10) are arranged between any two adjacent single batteries (a); The battery module further comprises a plurality of heat insulation pads (20) arranged between two pads (10).

11. The battery module of claim 10, wherein, The heat insulation pad (20) comprises any one of fireproof cloth, nylon, and polyamide-imide.

12. A battery pack, characterized by, The battery module (100) comprises a plurality of battery modules (100) as claimed in any one of claims 1-11.

13. The battery pack of claim 12, wherein, The battery module further comprises a cooling device (200) connected to the plurality of battery modules (100), and the pads (10) are filled between the single batteries (a) and the cooling device (200) after being heated and melted.

14. The battery pack of claim 13, wherein, The cooling device (200) comprises a plurality of second cooling plates (202), and one second cooling plate (202) is arranged between two adjacent battery modules (100).

15. The battery pack of claim 13, wherein, The cooling device (200) comprises a first cooling plate (201), and a plurality of battery modules (100) are arranged on the first cooling plate (201). After the gasket (10) is melted by heat, the gasket (10) fills the gap between the single battery (a) and the first cooling plate (201).

16. The battery pack of claim 15, wherein, The cooling device (200) further comprises a plurality of second cooling plates (202), and a plurality of second cooling plates (202) are arranged on the first cooling plate (201). One second cooling plate (202) is arranged between two adjacent battery modules (100). After the gasket (10) is melted by heat, the gasket (10) fills the gap between the single battery (a) and the plurality of second cooling plates (202).

17. The battery pack of claim 16, wherein, The gasket (10) melted by heat is connected between the single battery (a) and the first cooling plate (201), and is also connected between the single battery (a) and the plurality of second cooling plates (202).

18. The battery pack of any one of claims 12-17, wherein, The cooling device (200) further comprises a plurality of temperature sensors, and each temperature sensor is arranged on each single battery (a) to monitor the temperature of the corresponding single battery (a).

19. A gasket, characterized by The gasket (10) is used for a battery module (100), and the gasket (10) is the gasket (10) in the battery module according to any one of claims 1-11.

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