Cylindrical battery device

Abstract

The invention relates to the field of new energy batteries, and discloses a cylindrical battery device, in which a battery can be effectively supported, the probability of thermal runaway can be reduced, the insulativity of the battery is ensured, and the performance of the battery is improved. The cylindrical battery device comprises a box body and batteries, the batteries are fixed in the box body through glue layers, the glue layers comprise a first glue layer, at least part of the first glue layer is arranged between adjacent batteries, the first glue layer comprises inorganic foaming pouring sealant, the first glue layer meets the relational expression that F = (100-H) / (d * (2-mu) * C) * k, F is the thermal runaway rate of the inorganic foaming pouring sealant, and k is the thermal runaway rate of the inorganic foaming pouring sealant. The value range of F is 0-10%; h is the hardness of the inorganic foaming pouring sealant after curing; c is the density of the inorganic foaming pouring sealant after curing; d is the distance between the batteries, and the value range of d is 0.5 mm to 4 mm; mu is the flatness of the battery shell, and the value range of mu is 0-1mm; k is a constant.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a cylindrical battery device. Background Art

[0002] With the continuous development of new energy technology, new energy batteries, as an environmentally friendly energy storage and release device, have been widely used in energy storage power systems such as hydropower, thermal, wind and solar power stations, as well as power tools, electric bicycles, electric motorcycles, electric vehicles, military equipment, aerospace and many other technical fields.

[0003] The battery integration module is one of the core components of new energy batteries. The battery integration module mainly includes batteries, which are fixed in the box by battery potting glue to form a battery integration module. Existing battery potting glue usually uses organic foam potting glue. The thermal deformation temperature of organic foam potting glue is mostly below 100℃, and the decomposition temperature is between 400℃ and 500℃. However, when the battery has thermal runaway, the side temperature can reach above 600℃, and the organic foam potting glue will decompose and even burn. The organic foam potting glue will become weak and can no longer support the battery. It will also cause the spread of thermal runaway and affect the service life of the battery. In addition, since the foaming process and curing process of the organic foam potting glue are carried out simultaneously, and the above process is greatly affected by the ambient temperature, the type of heat-absorbing material and the size of the space, the reaction degree and foaming ratio of the main substances of the organic foam potting glue are inconsistent, which in turn leads to inconsistent semi-potting curing height of the organic foam potting glue, making the flatness of the cured organic foam potting glue uncontrollable, affecting the battery performance. Summary of the invention

[0004] In view of this, the present invention provides a cylindrical battery device to solve the problems of the existing battery integrated module that the organic foam potting glue will decompose when the battery has thermal runaway, cannot support the battery and cause the thermal runaway to spread, and the flatness of the organic foam potting glue is uncontrollable.

[0005] In a first aspect, the present invention provides a cylindrical battery device, comprising a box and a battery, wherein the battery is fixed in the box by a glue layer, wherein the glue layer comprises a first glue layer, wherein the first glue layer is at least partially disposed between adjacent batteries, wherein the first glue layer comprises an inorganic foaming potting glue, and wherein the first glue layer satisfies the following relationship:

[0006] F=(100-H) / (d×(2-μ)×C)×k,

[0007] Wherein, F is the thermal runaway rate of the inorganic foam potting glue, and the value range of F is 0% to 10%; H is the hardness of the inorganic foam potting glue after curing; C is the density of the inorganic foam potting glue after curing; d is the battery spacing, and the value range of d is 0.5mm to 4mm; μ is the flatness of the battery shell, and the value range of μ is 0 to 1mm; k is a constant, k=11×10 -3 .

[0008] Beneficial effects: In the cylindrical battery device of the present invention, the battery is fixed in the box by a glue layer, and the glue layer includes a first glue layer, and the first glue layer includes an inorganic foam potting glue, that is, the battery potting glue in the present invention mainly adopts an inorganic foam potting glue, and the thermal deformation temperature of the inorganic foam potting glue is above 700°C. When the battery has thermal runaway, this inorganic foam potting glue will not deform and decompose, and will not burn, and can always play the role of fixing and supporting the battery, and can also effectively slow down the spread of thermal runaway. Moreover, since the inorganic foam potting glue adopts the form of adding a foaming agent, the foaming agent can be foamed first during the mixing process, so that the foaming ratio of the inorganic foam potting glue is consistent. After the inorganic foam potting glue is injected into the box, the main substance of the inorganic foam potting glue only undergoes a curing process, so that the cured inorganic foam potting glue has good flatness and controllability, thereby improving the battery performance.

[0009] In addition, the thermal runaway rate of the inorganic foam potting glue of the present invention satisfies the above relationship with its hardness after curing, density after curing, battery spacing and battery shell flatness, which makes the inorganic foam potting glue not soften or decompose when thermal runaway occurs in the battery, and the inorganic foam potting glue after curing has better flatness and better insulation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0011] Figure 1 It is an overall schematic diagram of the cylindrical battery device of the present invention;

[0012] Figure 2 Schematic diagram of a cylindrical battery device of the present invention (the side wall of the box is hidden).

[0013] Description of reference numerals:

[0014] 1. Box body; 101. Box body bottom plate; 2. Battery; 3. First adhesive layer; 4. Second adhesive layer; 5. Heat exchange plate. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0016] Combine the following Figure 1-Figure 2 , describing the cylindrical battery device of the present invention, including a box body 1 and a battery 2, the battery 2 is fixed in the box body 1 by a glue layer, the glue layer includes a first glue layer 3, the first glue layer 3 is at least partially arranged between adjacent batteries 2, that is, the first glue layer 3 is arranged between the circumferences of two adjacent batteries, the first glue layer 3 includes an inorganic foaming potting glue, and the first glue layer 3 satisfies the following relationship:

[0017] F=(100-H) / (d×(2-μ)×C)×k

[0018] Among them, F is the thermal runaway rate of the inorganic foam potting glue, and the value range of F is 0% to 10%; H is the hardness of the inorganic foam potting glue after curing; C is the density of the inorganic foam potting glue after curing; d is the battery spacing, and the value range of d is 0.5mm to 4mm; μ is the flatness of the battery shell, and the value range of μ is 0 to 1mm; k is a constant, k=11×10 -3 .

[0019] In this cylindrical battery device, the battery 2 is fixed in the box 1 by a glue layer, and the glue layer includes a first glue layer 3, and the first glue layer 3 specifically includes an inorganic foam potting glue, that is, the battery potting glue in this embodiment mainly adopts an inorganic foam potting glue, and the thermal deformation temperature of the inorganic foam potting glue is above 700°C. When the battery 2 has a thermal runaway, this inorganic foam potting glue will not deform or decompose, and will not burn, and can always play the role of fixing and supporting the battery 2, and can also effectively slow down the spread of thermal runaway. Moreover, since the inorganic foam potting glue adopts the form of adding a foaming agent, the foaming agent can be foamed first during the mixing process, so that the foaming ratio of the inorganic foam potting glue is consistent. After the inorganic foam potting glue is injected into the box, the main substance of the inorganic foam potting glue only undergoes a curing process, so that the cured inorganic foam potting glue has good flatness and controllability, thereby improving the battery performance.

[0020] In addition, the thermal runaway rate of the inorganic foam potting glue of this embodiment satisfies the above relationship with its hardness after curing, density after curing, battery spacing and battery shell flatness, which makes this inorganic foam potting glue not soften or decompose when thermal runaway occurs in battery 2, and the inorganic foam potting glue after curing has better flatness and better insulation performance.

[0021] like Figure 1 As shown, the box 1 is the external bearing structure of the cylindrical battery device, has a certain structural strength, and can bear a certain external pressure and impact force to effectively protect the internal battery 2. The box 1 has a storage space inside, which is suitable for arranging the battery 2. Of course, the box 1 is also provided with structures and components that all existing battery devices have, which will not be repeated here. In this embodiment, the box 1 is a rectangular structure, the height of the box 1 is higher than the height of the battery 2, so as to accommodate the battery 2, and the bottom of the box 1 is the box bottom plate 101, and the battery 2 and the like are arranged on the box bottom plate 101.

[0022] The top of the box 1 can be matched with the cover, and the upper end of the box 1 is an open structure, through which the battery 2 can be placed in the accommodation space of the box 1, and the glue layer can also be injected into the accommodation space of the box 1 through the open structure. The cover is suitable for covering the open structure above the box 1. When the cover is covered on the box 1, the cover and the box 1 are sealed to protect the internal battery 2.

[0023] The number of batteries 2 is set according to the size of the internal accommodation space of the box body 1 and the performance requirements of the cylindrical battery device. Adjacent batteries 2 are arranged at intervals to facilitate the fixation and heat dissipation of the batteries 2. Specifically, the batteries 2 are fixed in the box body 1 by the glue layer, and the first glue layer 3 is at least partially arranged between adjacent batteries 2. After the glue layer is cured, it can provide support for the batteries 2, so that the batteries 2 can be stably arranged in the box body 1.

[0024] The glue layer includes a first glue layer 3, which belongs to a battery potting glue and is a battery packaging material. In this embodiment, the first glue layer 3 includes an inorganic foaming potting glue, and the first glue layer 3 satisfies the following relationship:

[0025] F=(100-H) / (d×(2-μ)×C)×k,

[0026] Among them, F is the thermal runaway rate of the inorganic foam potting glue, and the value range of F is 0% to 10%; H is the hardness of the inorganic foam potting glue after curing; C is the density of the inorganic foam potting glue after curing; d is the battery spacing, and the value range of d is 0.5mm to 4mm; μ is the flatness of the battery shell, and the value range of μ is 0 to 1mm; k is a constant, k=11×10 -3 .

[0027] According to the performance requirements of different batteries, an inorganic foam potting glue that satisfies the above relationship can be selected. It should be noted that the unit of the hardness H of the inorganic foam potting glue after curing is MPa, and the unit of the density C of the inorganic foam potting glue after curing is g / cm 3 .

[0028] If the thermal runaway rate F of the inorganic foam potting glue is too large, it is easy to cause the inorganic foam potting glue to fail to protect the battery 2. In this embodiment, the thermal runaway rate F of the inorganic foam potting glue ranges from 0% to 10%. Within the above range, the inorganic foam potting glue can effectively protect the battery 2. When the battery 2 has a thermal runaway, the inorganic foam potting glue will not soften or decompose, which can effectively reduce the probability of thermal runaway of the battery. Moreover, the cured inorganic foam potting glue has better flatness and good insulation performance.

[0029] In this embodiment, the thermal runaway rate F of the inorganic foam potting glue can be 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, etc., which can be selected and set according to different battery performance requirements.

[0030] It should be noted that the hardness H of the inorganic foam potting glue after curing can be controlled by increasing the proportion of the reinforcing agent, which is generally 0-10%. The reinforcing agent mainly includes one or more combinations of polypropylene fiber, basalt fiber and carbon fiber, nano titanium dioxide, modified bamboo fiber, carboxymethyl cellulose, nano silicon dioxide, etc. The increase of the reinforcing agent can adsorb the inorganic foam potting glue particles in the inorganic foam potting glue slurry, enhance the adhesion and cohesion of the inorganic foam potting glue, thereby making the inorganic foam potting glue more compact and improving its strength. The hardness H of the inorganic foam potting glue after curing can also be controlled by increasing the proportion of the water reducer, which is generally 0-5%. The main components are one or more combinations of lignin sulfonate water reducer, naphthalene water reducer, melamine water reducer, aminosulfonate water reducer, fatty acid salt water reducer and polycarboxylate water reducer. The water reducer is used to absorb moisture in the inorganic foam potting glue, reduce hydration, and improve the strength of the inorganic foam potting glue. The above-mentioned reinforcing agent and water reducing agent can be used together or separately. The hardness H of the inorganic foam potting adhesive after curing can also be controlled by other methods, which will not be elaborated here.

[0031] Controlling the density C of the inorganic foam potting glue after curing can be achieved by increasing the proportion of the foaming agent, generally 0-30%, and can also be achieved by selecting the type of foaming agent, mainly including chemical foaming agents (rosin resins, synthetic surfactants (alkylbenzene sulfonates, ether type, ester type, ether ester type and nitrogen-containing type, protein type, composite type, etc.) or physical foaming agents (air, nitrogen, carbon dioxide, hydrocarbons, Freon). The foaming agent generates gas accordingly, which expands in the inorganic foam potting glue slurry, increases the foaming ratio of the inorganic foam potting glue, and thus reduces the density.

[0032] The battery spacing d is the minimum distance between two adjacent batteries. If the battery spacing d is too small, adjacent batteries 2 are likely to contact and short-circuit, affecting the safety of battery 2. If the battery spacing d is too large, it affects the number of batteries 2 set in the box, which also affects the performance of the battery.

[0033] The battery spacing d has a value range of 0.5 mm to 4 mm. For example, the battery spacing d can be 0.5 mm, 1 mm, 1.8 mm, 2 mm, 2.2 mm, 3.5 mm, 3.8 mm, 4 mm, etc., and can be selected and set according to different battery performance requirements. When the battery spacing d is within the above range, the safety of the battery setting can be ensured, and the number of batteries 2 in the box 1 can be guaranteed.

[0034] In this embodiment, the flatness μ of the battery casing ranges from 0 to 1 mm. For example, the value of μ may be 0, 0.3 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, etc.

[0035] According to the above relationship, the values ​​of the thermal runaway rate F of the inorganic foam potting glue, the hardness H of the inorganic foam potting glue after curing, the density C of the inorganic foam potting glue after curing, the battery spacing d, and the flatness μ of the battery shell are shown in the following table:

[0036]

[0037] Battery pack thermal runaway test:

[0038] At room temperature, according to GB / T 31485-2015 standard, the needle penetration test requires the use of a high-temperature resistant steel needle with a diameter between 3mm and 8mm, penetrating the battery at a speed of 25±5mm per second from a direction perpendicular to the battery plate. After the steel needle stays inside the battery, record the battery voltage and temperature, and record the time when the adjacent battery starts to catch fire after the battery catches fire. The adjacent battery fire time is calculated from the battery fire. The fire time is less than 5 minutes and does not meet the safety requirements.

[0039] Distribution of glue layer between batteries:

[0040] 200 batteries are arranged in 10 rows and 20 columns inside the battery pack, with multiple gaps formed between the batteries. Glue layers are set between the gaps. The height of the glue layer exceeds the height of the battery shell to be qualified. The ratio of the number of excesses to the total number of gaps is recorded. If it is below 90%, the overall insulation requirements of the battery pack are not met.

[0041] It can be seen from the above data that when F is in the range of 0-10%, the glue layer between the batteries can be quickly and evenly distributed to ensure the overall insulation performance of the battery pack. At the same time, it also ensures that the heat spread rate between the batteries is within a controllable range, thereby improving the overall safety performance of the battery pack.

[0042] The test method for the hardness H of inorganic foam potting glue after curing is:

[0043] Hardness is also called compressive strength. Refer to the industry specification JGJ / T384-2016 "Technical Specification for Testing Concrete Compressive Strength by Core Drilling Method", process it into core specimens according to the regulations, and conduct specimen compression tests on the pressure testing machine. Sample size requirements: The core sample should use a core sample with a diameter of 100mm, which should not be less than 3 times the maximum particle size of the aggregate, or a small diameter core sample with a diameter of not less than 70mm and a diameter not less than 2 times the maximum particle size of the aggregate.

[0044] The test method for the density C of inorganic foam potting glue after curing is:

[0045] Cut the sample into a regular shape, measure its length, width and height, weigh it, and then calculate its density (weight / volume = density).

[0046] Furthermore, the adhesive layer also includes a second adhesive layer 4 , which is at least partially disposed between the box bottom plate 101 and the battery 2 , and a side of the second adhesive layer 4 facing away from the box bottom plate 101 is connected to the first adhesive layer 3 .

[0047] In this embodiment, the glue layer is a two-layer structure. In addition to the first glue layer 3, the glue layer also includes a second glue layer 4. The second glue layer 4 is at least partially arranged between the bottom plate 101 of the box body and the battery 2. The second glue layer 4 between the bottom plate 101 of the box body and the battery 2 can connect the bottom plate 101 of the box body and the battery 2 to improve the stability of the connection of the battery 2. The second glue layer 4 is mainly used to fix the battery 2 so that the battery 2 can be more firmly arranged in the box body 1. Specifically, the second glue layer 4 is a structural glue. In addition to fixing and limiting the battery 2 to a certain extent, the main function of the first glue layer 3 is to reduce the thermal runaway of the battery and provide a certain expansion space for the battery.

[0048] like Figure 2 From a perspective, in the box body 1, the second adhesive layer 4 and the first adhesive layer 3 are arranged from bottom to top, that is, the second adhesive layer 4 is connected to the first adhesive layer 3 on the side facing away from the box body bottom plate 101. This two-layer adhesive layer can not only reliably fix the battery 2, but also effectively reduce the probability of thermal runaway of the battery, thereby significantly improving the performance of the battery device.

[0049] Furthermore, the hardness of the second adhesive layer 4 is greater than the hardness of the first adhesive layer 3 .

[0050] The function of the second adhesive layer 4 is to fix the battery 2, so the second adhesive layer 4 needs to have sufficient hardness to support the battery 2 and provide sufficient spatial strength for the battery 2, while the first adhesive layer 3 needs to provide a certain expansion space for the battery 2, so the hardness of the first adhesive layer 3 needs to be smaller.

[0051] By setting the hardness of the second adhesive layer 4 to be greater than that of the first adhesive layer 3, the hardness of the first adhesive layer 3 and the second adhesive layer 4 are both suitable, the second adhesive layer 4 can provide sufficient support for the battery 2, so that the battery 2 is set firmly, and the first adhesive layer 3 can provide expansion space for the battery 2 to meet the needs of battery expansion.

[0052] Furthermore, a side of the first adhesive layer 3 facing away from the second adhesive layer 4 is placed below one-half of the height of the battery 2 , and the hardness of the first adhesive layer 3 is in the range of 60 MPa to 80 MPa.

[0053] In order to save inorganic foaming potting glue materials and reduce manufacturing costs, the side of the first glue layer 3 facing away from the second glue layer 4 can be placed below half the height of the battery 2. The height of the battery 2 refers to the height of the battery in its axial direction, expressed as Figure 1-Figure 2 Taking the viewing angle as an example, the axial direction of the battery 2 is the up-down direction.

[0054] When the side of the first adhesive layer 3 facing away from the second adhesive layer 4 is placed below one-half of the height of the battery 2, in order to ensure the supporting force of the adhesive layer on the battery 2 and stably fix the battery 2, the material hardness of the first adhesive layer 3 needs to be slightly larger, and its hardness range is 60MPa to 80MPa. For example, the hardness of the first adhesive layer 3 can be 60MPa, 65MPa, 72MPa, 80MPa, etc.

[0055] In other embodiments, a surface of the first adhesive layer 3 away from the second adhesive layer 4 is placed above one-half of the height of the battery 2 , and the hardness of the first adhesive layer 3 is in the range of 40 MPa to 80 MPa.

[0056] In order to meet the needs of different battery devices, the side of the first adhesive layer 3 away from the second adhesive layer 4 can also be placed above one-half of the height of the battery 2. In this case, the first adhesive layer 3 needs to provide enough expansion space for the battery 2. The material hardness of the first adhesive layer 3 can be slightly smaller, and its hardness range is 40MPa to 80MPa. For example, the hardness of the first adhesive layer 3 can be 40MPa, 42MPa, 55MPa, 60MPa, 80MPa, etc.

[0057] Furthermore, the upper cover plate of the battery 2 has a welding seam, and a side of the first adhesive layer 3 facing away from the second adhesive layer 4 is placed below the welding seam.

[0058] When each battery 2 is provided with an upper cover, the upper cover needs to be welded to the battery shell. Therefore, there is a weld between the battery shell and the upper cover. In order to avoid the influence of the adhesive layer on the weld, the side of the first adhesive layer 3 facing away from the second adhesive layer 4 is placed below the weld so that the first adhesive layer 3 will not contact the weld, so as to avoid the first adhesive layer 3 corroding the weld and affecting the connection strength between the battery shell and the upper cover.

[0059] Furthermore, the distance between the side of the first adhesive layer 3 facing away from the second adhesive layer 4 and the welding seam is in the range of 5% to 90% of the height of the battery 2 .

[0060] In order to improve reliability, the side of the first adhesive layer 3 facing away from the second adhesive layer 4 should maintain a certain distance from the weld. If the distance is too small, there is still a risk of the first adhesive layer 3 contacting the weld, and if the distance is too large, the thickness (height) of the adhesive layer is insufficient, which affects the fixing effect of the battery 2 and the effect of reducing heat spread.

[0061] In this embodiment, based on the height of the battery 2, the distance between the side of the first adhesive layer 3 facing away from the second adhesive layer 4 and the weld is in the range of 5% to 90% of the height of the battery 2. For example, the distance between the side of the first adhesive layer 3 facing away from the second adhesive layer 4 and the weld is in the range of 5%, 8%, 12%, 20%, 32%, 46%, 55%, 65%, 75%, 81%, 90%, etc. of the height of the battery 2.

[0062] Furthermore, a plurality of batteries 2 are provided, and the plurality of batteries 2 are arranged in a row, and the batteries 2 in the same row form a battery group, and a heat exchange plate 5 is provided between adjacent battery groups, and the heat exchange plate 5 is arranged perpendicular to the box bottom plate 101 .

[0063] In the cylindrical battery device of this embodiment, a plurality of batteries 2 are provided, and the plurality of batteries 2 are arranged in a row, and the batteries 2 in the same row form a battery pack. Figure 1-Figure 2 As shown, in this embodiment, five rows of battery packs are arranged in the box body 1 , and five batteries 2 are arranged in each row of battery packs, so a total of 25 batteries 2 are arranged in the box body 1 .

[0064] A heat exchange plate 5 is provided between adjacent battery packs. The heat exchange plate 5 is provided perpendicular to the bottom plate 101 of the box, that is, the side of the heat exchange plate 5 with a larger area is provided perpendicular to the bottom plate 101 of the box. The heat exchange plate 5 is used to timely exchange heat generated by the battery, and the heat exchange plate 5 can isolate the transfer of heat. The heat dissipation and reliability of the battery device can be improved by providing the heat exchange plate 5. Optionally, the heat exchange plate 5 can be a cold plate.

[0065] Furthermore, there is a gap between the battery 2 and the heat exchange plate 5 , and at least a portion of the gap is filled by the first adhesive layer 3 .

[0066] The battery 2 and the heat exchange plate 5 are not arranged in close contact, and there is a certain gap between the battery 2 and the heat exchange plate 5. At least part of the gap is filled by the first adhesive layer 3, so that the first adhesive layer 3 can wrap the battery 2, provide expansion space for the battery 2, protect the battery, and reduce the probability of thermal runaway spreading.

[0067] Furthermore, the projection area of ​​the battery 2 on the heat exchange plate 5 is S1, the projection area of ​​the first adhesive layer 3 entering the battery 2 on the heat exchange plate 5 is S2, and the ratio of S1 to S2 is in the range of 10:1 to 100:95.

[0068] The projection area of ​​the battery 2 on the heat exchange plate 5 is S1, and the first adhesive layer 3 enters the projection of the battery 2 on the heat exchange plate 5 so that the first adhesive layer 3 can be placed in the gap between the battery 2 and the heat exchange plate 5. The area of ​​the projection entered by the first adhesive layer 3 is S2, and the ratio of S1 to S2 is 10:1 to 100:95. If the above ratio range is too large, it may affect the heat dissipation of the battery, and if the above ratio range is too small, the first adhesive layer 3 cannot wrap the battery well, and cannot effectively protect and support the battery.

[0069] When the ratio of S1 to S2 is within the above range, the heat dissipation of the battery is not affected, and the first adhesive layer 3 can fully wrap the battery 2, providing expansion space for the battery 2 and reducing the probability of thermal runaway spreading.

[0070] For example, the ratio of S1 to S2 may be 10:1, 9:2, 20:3, 100:95, etc.

[0071] Furthermore, the distance between the side of the first adhesive layer 3 facing away from the second adhesive layer 4 and the top surface of the heat exchange plate 5 is in the range of 0% to 90% of the height of the battery 2 .

[0072] The side of the first adhesive layer 3 facing away from the second adhesive layer 4 needs to maintain a certain distance from the top surface of the heat exchange plate 5 to ensure the functions of the heat exchange plate 5 and the first adhesive layer 3. In this embodiment, based on the height of the battery 2, the distance between the side of the first adhesive layer 3 facing away from the second adhesive layer 4 and the top surface of the heat exchange plate 5 ranges from 0% to 90% of the height of the battery 2. For example, the distance between the side of the first adhesive layer 3 facing away from the second adhesive layer 4 and the top surface of the heat exchange plate 5 ranges from 0%, 6%, 12%, 25%, 30%, 38%, 42%, 50%, 63%, 76%, 83%, 90%, etc. of the height of the battery 2.

[0073] Furthermore, the batteries 2 of the same battery group are evenly spaced, and the adjacent battery groups are aligned, and the value range of F is 0.1% to 10%.

[0074] The batteries 2 of the same battery group are evenly spaced to reduce the influence on the heat dissipation of each battery 2. There are two arrangements between adjacent battery groups, one of which is that the adjacent battery groups are aligned, such as Figure 1-Figure 2As shown, in this embodiment, adjacent battery groups are aligned and arranged, and the arrangement of the batteries 2 in the box 1 is neat and regular. At this time, every four batteries 2 in adjacent rows are a unit, and the four batteries 2 form a rectangular structure (the four batteries are respectively located at a corner of the rectangle). In the box 1 of the same size, the gap distance between the batteries 2 is relatively far, and the thermal runaway rate F of the inorganic foam potting glue should be slightly larger, that is, the value range of F is 0.1% to 10%. For example, the thermal runaway rate F of the inorganic foam potting glue is 0.1%, 0.8%, 1.6%, 2.2%, 3.5%, 4.9%, 5.4%, 6%, 7.6%, 8%, 9.1%, 10%, etc.

[0075] Furthermore, the batteries 2 of the same battery group are evenly spaced, and the adjacent battery groups are staggered, and the value range of F is 0% to 9%.

[0076] Another arrangement of adjacent battery packs is to arrange adjacent battery packs in a staggered manner. In other embodiments, the battery device can arrange the batteries in this arrangement. At this time, every three batteries 2 in adjacent rows are a unit, and the three batteries 2 form a triangular structure (the three batteries are located at one corner of the triangle respectively). In the box 1 of the same size, the gap distance between the batteries 2 is relatively close, and the thermal runaway rate F of the inorganic foam potting glue should be slightly smaller, that is, the value range of F is 0% to 9%. For example, the thermal runaway rate F of the inorganic foam potting glue is 0%, 1.5%, 2.7%, 3%, 4.2%, 5%, 6.4%, 7.8%, 8%, 9%, etc.

[0077] Furthermore, the hardness H of the inorganic foam potting adhesive after curing is in the range of 40 MPa to 80 MPa.

[0078] If the hardness H of the inorganic foam potting glue after curing is too large, it will affect the breathing and expansion of the battery. If the hardness H of the inorganic foam potting glue after curing is too small, the body strength of the inorganic foam potting glue will be weakened, and it will be difficult to meet the battery fixing needs.

[0079] In this embodiment, the hardness H of the inorganic foam potting glue after curing can be 41MPa, 42MPa, 43MPa, 44MPa, 45MPa, 46MPa, 47MPa, 48MPa, 49MPa, 50MPa, 51MPa, 52MPa, 53MPa, 54MPa, 55MPa, 56MPa, 57MPa, 58MPa, 59MPa, 60MPa, 61MPa, 62MPa, 63MPa, 64MPa, 65MPa, 66MPa, 67MPa, 68MPa, 69MPa, 70MPa, 71MPa, 72MPa, 73MPa, 74MPa, 75MPa, 76MPa, 77MPa, 78MPa, 79MPa, 80MPa, etc., which can be selected and set according to different battery performance requirements. The inorganic foam potting glue has a hardness H after curing within the above range, which can effectively fix the battery 2 .

[0080] Furthermore, the density C of the inorganic foam potting glue after curing is less than or equal to 0.5 g / cm 3 .

[0081] If the density C of the inorganic foam potting glue after curing is too large, the amount of glue used will increase. In this embodiment, the density C of the inorganic foam potting glue after curing can be 0.1g / cm 3 , 0.15g / cm 3 , 0.2g / cm 3 , 0.25g / cm 3 , 0.3g / cm 3 , 0.35g / cm 3 , 0.4g / cm 3 , 0.45g / cm 3 , 0.5g / cm 3 , etc., can be selected and set according to different battery performance requirements. The density C of the inorganic foam potting glue after curing is within the above range, which can not only meet the strength requirements of the inorganic foam potting glue, but also reduce the weight and manufacturing cost of the battery.

[0082] Furthermore, the first adhesive layer 3 covers 1% to 90% of the periphery of the battery 2, and the value range of F is 0.1% to 9.9%.

[0083] The first adhesive layer 3 can insulate and heat-insulate the adjacent batteries 2. The higher the proportion of the first adhesive layer 3 covering the periphery of the battery 2, the better the insulation and heat-insulating effect on the battery 2, which can effectively prevent the problem of overheating of a battery affecting other batteries.

[0084] In this embodiment, the first adhesive layer 3 can cover 1%, 5%, 15%, 20%, 30%, 42%, 51%, 66%, 75%, 85%, 90%, etc. of the periphery of the battery 2. At this time, the thermal runaway rate F of the inorganic foam potting glue ranges from 0.1% to 9.9%. For example, the thermal runaway rate F of the inorganic foam potting glue is 0.1%, 0.5%, 1.2%, 2%, 3.6%, 4.2%, 5.5%, 6%, 7.3%, 8.4%, 9.9%, etc.

[0085] Furthermore, a fixing bracket is arranged on the box bottom plate 101 , and the fixing bracket has a mounting position for arranging the battery 2 , and the first adhesive layer 3 fills at least part of the gap between the mounting position and the battery 2 .

[0086] The fixing bracket is arranged on the bottom plate 101 of the box body, and the fixing bracket is pre-arranged with a mounting position, and the battery 2 is suitable for being installed in the mounting position. For example, the mounting position is a mounting groove, and the battery 2 is suitable for being inserted into the mounting groove, so that the battery 2 can be accurately and quickly set in the box body 1, thereby improving the assembly efficiency.

[0087] The radial dimension of the mounting position is slightly larger than the battery 2 so that the battery 2 can be smoothly installed on the mounting position. Therefore, there is a certain gap between the mounting position and the battery 2. The first adhesive layer 3 fills at least part of the gap between the mounting position and the battery 2 to enhance the connection force between the mounting position and the battery 2, so that the battery is more firmly set in the mounting position.

[0088] Moreover, the fixing bracket can also protect the battery to prevent external vibration, heat shock, etc. from having adverse effects on the battery.

[0089] In addition, in this embodiment, the porosity range of the inorganic foam potting glue is 0-2 mm.

[0090] If the porosity of the inorganic foam potting glue is too large, there will be voids inside the inorganic foam potting glue, which may lead to a lack of fillers between adjacent batteries, resulting in insulation failure between adjacent batteries. At the same time, there will be air heat conduction between adjacent batteries, which makes it difficult to achieve the battery insulation effect, resulting in an increased chance of thermal runaway. If the porosity of the inorganic foam potting glue is too small, the density of the inorganic foam potting glue will increase, and the weight of the inorganic foam potting glue will increase, and the weight reduction effect cannot be achieved.

[0091] In this embodiment, the porosity of the inorganic foam potting glue can be 0, 0.6 mm, 1.2 mm, 2 mm, etc., and can be selected and set according to different battery performance requirements. The porosity of the inorganic foam potting glue is within the above range, which can achieve the effect of weight reduction and battery insulation and heat insulation.

[0092] In this embodiment, the fluidity of the inorganic foam potting adhesive before curing ranges from 0 to 1000 mm.

[0093] If the fluidity of the inorganic foam potting glue before curing is too large, the flow channel will be complex and the flow will be difficult, which will increase the difficulty of process implementation and make it difficult to ensure the filling effect of the narrowest internal position.

[0094] In this embodiment, the fluidity of the inorganic foam potting glue before curing can be 0, 30 mm, 620 mm, 800 mm, 1000 mm, etc., which can be selected and set according to different battery performance requirements. The fluidity of the inorganic foam potting glue before curing is within the above range, which can improve the process operability and ensure product quality.

[0095] Inorganic foaming potting glue can be low-viscosity potting glue. This low-viscosity potting glue has the characteristics of high temperature resistance, not easy to soften, conducive to foaming, good flatness after curing, and good absolute performance. The dust collection battery module manufactured by using this low-viscosity potting glue is high temperature resistant, has a long service life, and can improve battery performance.

[0096] In this embodiment, the inorganic foaming potting glue includes inorganic silicate, which is easy to obtain and has a low cost, which is helpful to control the manufacturing cost of the battery.

[0097] In this embodiment, the battery potting glue is mainly inorganic foam potting glue, and may also include additives such as hydrogen peroxide, hard calcium, fly ash and inorganic foam potting glue foaming agent. The main component of the inorganic foam potting glue is inorganic silicate. The refractoriness of the above battery potting glue is greater than 700°C, and the refractoriness of the foamed inorganic foam potting glue can reach 800°C, which meets the standard GB8624, and the combustion performance is A1 grade, which belongs to non-combustible material. The above refractoriness is also called melting resistance, which is a performance index used to characterize the ability of an object to resist high temperature without melting.

[0098] Among them, the closed-cell rate of the inorganic foam potting glue is greater than 90%, the air convection heat transfer is significantly reduced, and the thermal conductivity is less than 0.1W / (m·K).

[0099] Furthermore, the inorganic foam potting compound includes one or more of ordinary silicate inorganic foam potting compound, early strength silicate inorganic foam potting compound, ordinary silicate inorganic foam potting compound for ultra-high performance concrete, sulphoaluminate inorganic foam potting compound for soft underground engineering and high performance silicate inorganic foam potting compound.

[0100] The material of the inorganic foam potting compound can be one or more, and can be selected and set according to different battery performance requirements. Ordinary silicate inorganic foam potting compound, early strength silicate inorganic foam potting compound, ordinary silicate inorganic foam potting compound for ultra-high performance concrete, sulphoaluminate inorganic foam potting compound for soft underground engineering, and high-performance silicate inorganic foam potting compound are all relatively easy to obtain inorganic silicates, with low use costs, which is conducive to controlling the manufacturing cost of batteries.

[0101] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A cylindrical battery device, characterized in that: The invention comprises a box (1) and a battery (2), wherein the battery (2) is fixed in the box (1) by means of a glue layer, wherein the glue layer comprises a first glue layer (3), wherein the first glue layer (3) is at least partially arranged between adjacent batteries (2), wherein the first glue layer (3) comprises an inorganic foaming potting glue, and wherein the first glue layer (3) satisfies the following relationship: F=(100-H) / (d×(2-μ)×C)×k, Wherein, F is the thermal runaway rate of the inorganic foam potting glue, and the value range of F is 0% to 10%; H is the hardness of the inorganic foam potting glue after curing; C is the density of the inorganic foam potting glue after curing; d is the battery spacing, and the value range of d is 0.5mm to 4mm; μ is the flatness of the battery shell, and the value range of μ is 0 to 1mm; k is a constant, k=11×10 -3 ; The porosity range of the inorganic foaming potting glue is 0-2 mm.

2. The cylindrical battery device according to claim 1, characterized in that: The adhesive layer further comprises a second adhesive layer (4), wherein the second adhesive layer (4) is at least partially disposed between the box bottom plate (101) and the battery (2), and a side of the second adhesive layer (4) facing away from the box bottom plate (101) is connected to the first adhesive layer (3).

3. The cylindrical battery device according to claim 2, characterized in that: The hardness of the second adhesive layer (4) is greater than the hardness of the first adhesive layer (3).

4. The cylindrical battery device according to claim 2, characterized in that: The side of the first adhesive layer (3) facing away from the second adhesive layer (4) is placed below one-half the height of the battery (2), and the hardness of the first adhesive layer (3) is in the range of 60 MPa to 80 MPa.

5. The cylindrical battery device according to claim 2, characterized in that: The side of the first adhesive layer (3) away from the second adhesive layer (4) is placed above one-half of the height of the battery (2), and the hardness of the first adhesive layer (3) is in the range of 40 MPa to 80 MPa.

6. The cylindrical battery device according to claim 2, characterized in that: The upper cover plate of the battery (2) has a welding seam, and a side of the first adhesive layer (3) facing away from the second adhesive layer (4) is placed below the welding seam.

7. The cylindrical battery device according to claim 6, characterized in that: The distance between the side of the first adhesive layer (3) facing away from the second adhesive layer (4) and the welding seam is in the range of 5% to 90% of the height of the battery (2).

8. The cylindrical battery device according to claim 2, characterized in that: A plurality of batteries (2) are provided, and the plurality of batteries (2) are arranged in a row. The batteries (2) in the same row form a battery group. A heat exchange plate (5) is provided between adjacent battery groups. The heat exchange plate (5) is arranged perpendicular to the bottom plate (101) of the box body.

9. The cylindrical battery device according to claim 8, characterized in that: There is a gap between the battery (2) and the heat exchange plate (5), and at least a portion of the gap is filled by the first adhesive layer (3).

10. The cylindrical battery device according to claim 9, characterized in that: The projection area of ​​the battery (2) on the heat exchange plate (5) is S1, the projection area of ​​the battery (2) on the heat exchange plate (5) where the first adhesive layer (3) enters, and the area of ​​the projection where the first adhesive layer (3) enters is S2, and the ratio of S1 to S2 is in the range of 10:1 to 100:

95.

11. The cylindrical battery device according to claim 8, characterized in that: The distance between the side of the first adhesive layer (3) facing away from the second adhesive layer (4) and the top surface of the heat exchange plate (5) is in the range of 0% to 90% of the height of the battery (2).

12. The cylindrical battery device according to claim 8, characterized in that: The batteries (2) of the same battery group are arranged at even intervals, and adjacent battery groups are arranged in alignment. The value range of F is 0.1% to 10%.

13. The cylindrical battery device according to claim 8, characterized in that: The batteries (2) of the same battery group are arranged at even intervals, and adjacent battery groups are arranged in a staggered manner. The value range of F is 0% to 9%.

14. The cylindrical battery device according to any one of claims 1 to 13, characterized in that: Box bottom A fixing bracket is arranged on the board (101), and the fixing bracket has a mounting position for arranging the battery (2). The first adhesive layer (3) fills at least a portion of the gap between the mounting position and the battery (2).

Images