Cylindrical battery device

Abstract

A cylindrical battery device. The cylindrical battery device comprises a case (1) and batteries (2), the batteries (2) are fixed in the case (1) by means of an adhesive layer, the adhesive layer includes a first adhesive layer (3), the first adhesive layer (3) is at least partially arranged between adjacent batteries (2), the first adhesive layer (3) comprises an inorganic foamed potting adhesive, and the first adhesive layer (3) satisfies the following relational expression: F=(100-H) / (d×(2-μ)×C)×k, wherein F is the thermal runaway rate of the inorganic foamed potting adhesive, and the value range of F is 0%-10%; H is the hardness of the cured inorganic foamed potting adhesive; C is the density of the cured inorganic foamed potting adhesive; d is the battery spacing, and the value range of d is 0.5-4 mm; μ is the flatness of battery casings, and the value range of μ is 0-1 mm; and k is a constant. The batteries (2) in the cylindrical battery device can be effectively supported, and the probability of thermal runaway can be reduced, thereby ensuring the insulation of the batteries (2), and improving the performance of the batteries (2).

Description

Cylindrical battery device

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411428098.0, filed on October 14, 2024, entitled “Cylindrical Battery Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of new energy battery technology, specifically to a cylindrical battery device. Background Technology

[0004] With the continuous development of new energy technologies, 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 power, wind power and solar power plants, as well as in many technical fields such as power tools, electric bicycles, electric motorcycles, electric cars, military equipment, and aerospace.

[0005] The battery integrated module is one of the core components of new energy batteries. It mainly consists of the battery, which is fixed to the casing using battery potting compound. Existing battery potting compounds typically use organic foam potting compounds, most of which have a heat distortion temperature below 100℃ and a decomposition temperature between 400℃ and 500℃. However, when a battery experiences thermal runaway, the side temperature can reach over 600℃. The organic foam potting compound will decompose and may even burn, losing its strength and failing to support the battery. This can also lead to the spread of thermal runaway, affecting the battery's lifespan. Furthermore, because the foaming and curing processes of the organic foam potting compound occur simultaneously, and these processes are significantly affected by ambient temperature, the type of heat-absorbing material, and the size of the space, the reaction degree and foaming ratio of the main substances in the organic foam potting compound are inconsistent. This results in inconsistent semi-encapsulated curing heights, making the flatness of the cured organic foam potting compound uncontrollable and affecting battery performance. Summary of the Invention

[0006] In view of this, this application provides a cylindrical battery device to solve the problems of organic foam potting compound decomposing when the battery experiences thermal runaway, failing to support the battery and causing thermal runaway to spread, and the uncontrollable flatness of organic foam potting compound in existing battery integrated modules.

[0007] In a first aspect, this application provides a cylindrical battery device, including a housing and a battery, wherein the battery is fixed to the housing by an adhesive layer, the adhesive layer including a first adhesive layer, the first adhesive layer being at least partially disposed between adjacent batteries, the first adhesive layer comprising an inorganic foam potting compound, and the first adhesive layer satisfying the following relationship:

[0008] F=(100-H) / (d×(2-μ)×C)×k,

[0009] Wherein, F is the thermal runaway rate of the inorganic foam potting compound, and the value of F ranges from 0% to 10%; H is the hardness of the inorganic foam potting compound after curing; C is the density of the inorganic foam potting compound after curing; d is the battery spacing, and the value of d ranges from 0.5 mm to 4 mm; μ is the flatness of the battery casing, and the value of μ ranges from 0 to 1 mm; k is a constant, k = 11 × 10⁻⁶. -3 .

[0010] Beneficial Effects: In the cylindrical battery device of this application, the battery is fixed to the casing by an adhesive layer. The adhesive layer includes a first adhesive layer, which comprises an inorganic foam potting compound. Specifically, the battery potting compound in this application primarily uses an inorganic foam potting compound. The heat distortion temperature of the inorganic foam potting compound is above 700℃. When the battery experiences thermal runaway, this inorganic foam potting compound will not deform or decompose, nor will it burn. It can consistently provide support and fixation for the battery and effectively mitigate the spread of thermal runaway. Furthermore, since the inorganic foam potting compound uses a foaming agent, the foaming agent can foam during the mixing process, resulting in a consistent foaming ratio. After being injected into the casing, the main components of the inorganic foam potting compound only undergo a curing process, giving the cured inorganic foam potting compound good flatness and controllability, thereby improving battery performance.

[0011] Furthermore, the thermal runaway rate of the inorganic foam potting compound in this application satisfies the above-mentioned relationship with its cured hardness, cured density, battery spacing, and battery casing flatness. This further ensures that the inorganic foam potting compound will not soften or decompose when the battery experiences thermal runaway, and the cured inorganic foam potting compound has better flatness and superior insulation performance. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 is an overall schematic diagram of the cylindrical battery device of this application;

[0014] Figure 2 is a schematic diagram of the cylindrical battery device of this application (with the side wall of the casing hidden).

[0015] Explanation of reference numerals in the attached drawings: 1. Box body; 101. Box bottom plate; 2. Battery; 3. First adhesive layer; 4. Second adhesive layer; 5. Heat exchange plate. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] The cylindrical battery device of this application is described below with reference to Figures 1 and 2, including a housing 1 and a battery 2. The battery 2 is fixed inside the housing 1 by an adhesive layer, which includes a first adhesive layer 3. The first adhesive layer 3 is at least partially disposed between adjacent batteries 2, that is, between the peripheral surfaces of two adjacent batteries. The first adhesive layer 3 includes an inorganic foam potting compound, and the first adhesive layer 3 satisfies the following relationship: F=(100-H) / (d×(2-μ)×C)×k,

[0018] Where F is the thermal runaway rate of the inorganic foam potting compound, ranging from 0% to 10%; H is the hardness of the inorganic foam potting compound after curing; C is the density of the inorganic foam potting compound after curing; d is the battery spacing, ranging from 0.5 mm to 4 mm; μ is the flatness of the battery casing, ranging from 0 to 1 mm; and k is a constant, k = 11 × 10⁻⁶. -3 .

[0019] In this cylindrical battery device, the battery 2 is fixed inside the housing 1 by an adhesive layer. The adhesive layer includes a first adhesive layer 3, which specifically comprises an inorganic foam potting compound. In this embodiment, the battery potting compound mainly uses an inorganic foam potting compound. The heat distortion temperature of the inorganic foam potting compound is above 700℃. When the battery 2 experiences thermal runaway, this inorganic foam potting compound will not deform or decompose, nor will it burn. It can always play a role in fixing and supporting the battery 2 and can also effectively slow down the spread of thermal runaway. Moreover, since the inorganic foam potting compound is made by adding a foaming agent, the foaming agent can foam during the mixing process, making the foaming ratio of the inorganic foam potting compound consistent. After the inorganic foam potting compound is injected into the housing, the main substances of the inorganic foam potting compound only undergo a curing process, so that the cured inorganic foam potting compound has good flatness and controllability, thereby improving battery performance.

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

[0021] As shown in Figure 1, the housing 1 is the external support structure of the cylindrical battery device, possessing a certain structural strength and capable of withstanding a certain amount of external pressure and impact to effectively protect the internal battery 2. The housing 1 has an internal space suitable for housing the battery 2. Of course, the housing 1 also contains structures and components common to existing battery devices, which will not be elaborated upon here. In this embodiment, the housing 1 has a rectangular parallelepiped structure, with its height exceeding that of the battery 2 to accommodate it. The bottom of the housing 1 is a base plate 101, on which the battery 2 and other components are mounted.

[0022] The top of the housing 1 can be fitted with a cover. The upper part of the housing 1 has an open structure, through which the battery 2 can be placed into the receiving space of the housing 1. The adhesive layer can also be injected into the receiving space of the housing 1 through the open structure. The cover is suitable for covering the open structure on the top of the housing 1. When the cover is placed on the housing 1, the cover and the housing 1 are sealed to protect the internal battery 2.

[0023] The number of batteries 2 is determined based on the internal space of the housing 1 and the performance requirements of the cylindrical battery assembly. Adjacent batteries 2 are spaced apart to facilitate fixation and heat dissipation. Specifically, the batteries 2 are fixed to the housing 1 by an adhesive layer. The first adhesive layer 3 is at least partially disposed between adjacent batteries 2. After curing, the adhesive layer provides support to the batteries 2, ensuring their stable placement within the housing 1.

[0024] The adhesive layer includes a first adhesive layer 3, which is a battery potting compound and serves as a battery encapsulation material. In this embodiment, the first adhesive layer 3 includes an inorganic foam potting compound, and the first adhesive layer 3 satisfies the following relationship: F=(100-H) / (d×(2-μ)×C)×k,

[0025] Where F is the thermal runaway rate of the inorganic foam potting compound, ranging from 0% to 10%; H is the hardness of the inorganic foam potting compound after curing; C is the density of the inorganic foam potting compound after curing; d is the battery spacing, ranging from 0.5 mm to 4 mm; μ is the flatness of the battery casing, ranging from 0 to 1 mm; and k is a constant, k = 11 × 10⁻⁶. -3 .

[0026] Inorganic foam potting compounds that satisfy the above relationships can be selected according to different battery performance requirements. It should be noted that the unit of the hardness H of the cured inorganic foam potting compound is MPa, and the unit of the density C of the cured inorganic foam potting compound is g / cm³. 3 .

[0027] If the thermal runaway rate F of the inorganic foam potting compound is too high, it can easily lead to the failure of the inorganic foam potting compound to protect the battery 2. In this embodiment, the thermal runaway rate F of the inorganic foam potting compound is in the range of 0% to 10%. Within the above range, the inorganic foam potting compound can effectively protect the battery 2. When the battery 2 experiences thermal runaway, the inorganic foam potting compound will not soften or decompose, which can effectively reduce the probability of thermal runaway of the battery. Moreover, the cured inorganic foam potting compound has better flatness and better insulation performance.

[0028] In this embodiment, the thermal runaway rate F of the inorganic foam potting compound can be 0%, 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, etc., and can be selected and set according to different battery performance requirements.

[0029] It should be noted that the hardness (H) of the cured inorganic foam potting compound can be controlled by increasing the proportion of reinforcing agents, generally from 0% to 10%. Reinforcing agents mainly include one or more combinations of polypropylene fibers, basalt fibers and carbon fibers, nano-titanium dioxide, modified bamboo fibers, carboxymethyl cellulose, and nano-silica. Adding reinforcing agents can adsorb inorganic foam potting compound particles in the slurry, enhancing the adhesiveness and cohesion of the inorganic foam potting compound, thus making it denser and increasing its strength. The hardness (H) of the cured inorganic foam potting compound can also be controlled by increasing the proportion of water-reducing agents, generally from 0% to 5%. The main components are one or more combinations of lignin sulfonate water-reducing agents, naphthalene-based water-reducing agents, melamine water-reducing agents, aminosulfonate water-reducing agents, fatty acid salt water-reducing agents, and polycarboxylate water-reducing agents. Water-reducing agents are used to absorb moisture in the inorganic foam potting compound, reducing hydration and improving its strength. The aforementioned reinforcing agents and water-reducing agents can be used together or separately. The hardness H of the inorganic foamed potting compound after curing can also be controlled by other methods, which will not be elaborated here.

[0030] The density C of inorganic foamed potting compound after curing can be controlled by increasing the proportion of foaming agent, generally from 0% to 30%. Alternatively, the type of foaming agent can be selected, mainly including chemical foaming agents (rosin resins, synthetic surfactants (alkylbenzene sulfonates, ethers, esters, ether esters, nitrogen-containing types, proteins, composites, etc.) or physical foaming agents (air, nitrogen, carbon dioxide, hydrocarbons, Freon). The foaming agent generates gas, which expands in the inorganic foamed potting compound slurry, increasing the foaming ratio and thus reducing the density.

[0031] The battery spacing d is the minimum distance between two adjacent batteries. If the battery spacing d is too small, the adjacent batteries 2 are prone to contact and short circuit, which affects the safety of battery 2. If the battery spacing d is too large, it will affect the number of batteries 2 that can be installed in the box, which will also affect the performance of the batteries.

[0032] The battery spacing d ranges from 0.5mm to 4mm. For example, the battery spacing d can be 0.5mm, 1mm, 1.8mm, 2mm, 2.2mm, 3.5mm, 3.8mm, 4mm, etc., and can be selected and set according to different battery performance requirements. Within the above range, the battery spacing d ensures both the safety of the battery arrangement and the quantity of batteries 2 within the housing 1.

[0033] In this embodiment, the flatness μ of the battery casing ranges from 0 to 1 mm. For example, the value of μ can be 0, 0.3 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, etc.

[0034] Based on the above relationships, examples of the values ​​for the thermal runaway rate F of the inorganic foam potting compound, the cured hardness H of the inorganic foam potting compound, the cured density C of the inorganic foam potting compound, the battery spacing d, and the battery casing flatness μ are shown in the table below:

[0035] Battery pack thermal runaway test:

[0036] 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 plates. After the steel needle remains inside the battery, the battery voltage and temperature are recorded, as well as the time when adjacent batteries begin to ignite after the first battery ignites. The ignition time of adjacent batteries is calculated from the time the first battery ignites; an ignition time of less than 5 minutes does not meet the safety requirements.

[0037] Distribution of the adhesive layer between cells:

[0038] Two hundred batteries are arranged in 10 rows and 20 columns inside the battery pack, with multiple gaps between the batteries. An adhesive layer is placed between the gaps. The height of the adhesive layer must exceed the height of the battery casing to be considered acceptable. The ratio of the number of batteries exceeding the height to the total number of gaps is recorded. If the ratio is less than 90%, the overall insulation requirements of the battery pack are not met.

[0039] The data above shows that when F is in the range of 0 to 10%, the adhesive layer between the batteries can be quickly and evenly distributed, ensuring 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, thus improving the overall safety performance of the battery pack.

[0040] The test method for the hardness H of inorganic foam potting compound after curing is as follows:

[0041] Hardness, also known as compressive strength, is determined according to the industry standard JGJ / T384-2016 "Technical Specification for Testing Compressive Strength of Concrete by Core Drilling Method." Core samples are prepared according to regulations and subjected to compressive strength testing on a pressure testing machine. Sample size requirements: Core samples should be 100mm in diameter, and the diameter should not be less than three times the maximum aggregate size. Alternatively, smaller diameter core samples with a diameter not less than 70mm and not less than twice the maximum aggregate size can be used.

[0042] The test method for the density C of inorganic foam potting compound after curing is as follows:

[0043] Cut the sample into a regular shape, measure its length, width, and height, weigh it, and then calculate its density (weight / volume = density).

[0044] Furthermore, the adhesive layer also includes a second adhesive layer 4, which is at least partially disposed between the bottom plate 101 of the casing and the battery 2, and the side of the second adhesive layer 4 facing away from the bottom plate 101 is connected to the first adhesive layer 3.

[0045] In this embodiment, the adhesive layer has a two-layer structure. Besides the first adhesive layer 3, it also includes a second adhesive layer 4. The second adhesive layer 4 is at least partially disposed between the bottom plate 101 of the housing and the battery 2. The second adhesive layer 4 between the bottom plate 101 and the battery 2 connects the bottom plate 101 and the battery 2, thereby improving the stability of the battery 2 connection. The second adhesive layer 4 is mainly used to fix the battery 2, allowing it to be more securely placed inside the housing 1. Specifically, the second adhesive layer 4 is a structural adhesive. The first adhesive layer 3, in addition to providing some fixation and positioning for the battery 2, primarily functions to reduce thermal runaway and provide some expansion space for the battery.

[0046] As shown in Figure 2, inside the housing 1, the second adhesive layer 4 and the first adhesive layer 3 are arranged sequentially from bottom to top, that is, the side of the second adhesive layer 4 facing away from the bottom plate 101 of the housing is connected to the first adhesive layer 3. This two-layer adhesive structure 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.

[0047] Furthermore, the hardness of the second adhesive layer 4 is greater than that of the first adhesive layer 3.

[0048] The function of the second adhesive layer 4 is to fix the battery 2. Therefore, the second adhesive layer 4 needs to have sufficient hardness to support the battery 2 and provide sufficient space strength for the battery 2. The first adhesive layer 3 needs to provide a certain expansion space for the battery 2. Therefore, the hardness of the first adhesive layer 3 needs to be relatively low.

[0049] By setting the hardness of the second adhesive layer 4 to be greater than that of the first adhesive layer 3, the hardness of both the first adhesive layer 3 and the second adhesive layer 4 is suitable. The second adhesive layer 4 can provide sufficient support for the battery 2, making the battery 2 stable, while the first adhesive layer 3 can provide expansion space for the battery 2 to meet the needs of battery expansion.

[0050] Furthermore, the side of the first adhesive layer 3 facing away from the second adhesive layer 4 is positioned below half the height of the battery 2, and the hardness range of the first adhesive layer 3 is 60MPa to 80MPa.

[0051] To save on inorganic foaming potting compound materials and reduce manufacturing costs, the side of the first adhesive layer 3 facing away from the second adhesive layer 4 can be positioned below half the height of the battery 2. The height of the battery 2 refers to its axial height; taking Figures 1-2 as an example, the axial direction of the battery 2 is vertical.

[0052] When the side of the first adhesive layer 3 facing away from the second adhesive layer 4 is placed below half the height of the battery 2, in order to ensure the support force of the adhesive layer on the battery 2 and to stably fix the battery 2, the material hardness of the first adhesive layer 3 needs to be slightly higher, 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.

[0053] In other embodiments, the side of the first adhesive layer 3 away from the second adhesive layer 4 is positioned above half 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.

[0054] 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 positioned above half the height of the battery 2. In this case, the first adhesive layer 3 needs to provide sufficient expansion space for the battery 2. The material hardness of the first adhesive layer 3 can be slightly lower, with a hardness range of 40MPa to 80MPa. For example, the hardness of the first adhesive layer 3 can be 40MPa, 42MPa, 55MPa, 60MPa, 80MPa, etc.

[0055] Furthermore, the upper cover of battery 2 has a weld, and the side of the first adhesive layer 3 facing away from the second adhesive layer 4 is placed below the weld.

[0056] When installing the top cover of each battery 2, the top cover needs to be welded to the battery casing. Therefore, there is a weld between the battery casing and the top cover. In order to avoid the adhesive layer affecting 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 come into contact with the weld, thereby avoiding the first adhesive layer 3 corroding the weld and affecting the connection strength between the battery casing and the top cover.

[0057] Furthermore, the distance between the side of the first adhesive layer 3 facing away from the second adhesive layer 4 and the weld seam ranges from 5% to 90% of the height of the battery 2.

[0058] To improve reliability, the side of the first adhesive layer 3 facing away from the second adhesive layer 4 should be kept at a certain distance from the weld. If the distance is too small, the first adhesive layer 3 is still at risk of contacting the weld. If the distance is too large, the thickness (height) of the adhesive layer will be insufficient, which will affect the fixing effect on the battery 2 and the effect of reducing heat spread.

[0059] 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 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 5%, 8%, 12%, 20%, 32%, 46%, 55%, 65%, 75%, 81%, 90% of the height of the battery 2.

[0060] Furthermore, multiple batteries 2 are provided, and the multiple batteries 2 are arranged in a row. The batteries 2 in the same row form a battery pack. A heat exchange plate 5 is provided between adjacent battery packs, and the heat exchange plate 5 is arranged perpendicular to the bottom plate 101 of the box.

[0061] In the cylindrical battery device of this embodiment, multiple batteries 2 are provided, and multiple batteries 2 are arranged in rows. Batteries 2 located in the same row form a battery pack, as shown in Figures 1-2. In this embodiment, five rows of battery packs are provided in the housing 1, and five batteries 2 are provided in each row of battery packs. Therefore, a total of 25 batteries 2 are provided in the housing 1.

[0062] A heat exchange plate 5 is provided between adjacent battery packs. The heat exchange plate 5 is perpendicular to the bottom plate 101 of the housing, meaning that the larger side of the heat exchange plate 5 is perpendicular to the bottom plate 101. The heat exchange plate 5 is used to exchange the heat generated by the battery in a timely manner, and it also isolates the heat transfer. By providing the heat exchange plate 5, the heat dissipation and reliability of the battery device can be improved. Optionally, the heat exchange plate 5 can be a cold plate.

[0063] Furthermore, there is a gap between the battery 2 and the heat exchange plate 5, and at least part of the gap is filled by the first adhesive layer 3.

[0064] The battery 2 and the heat exchange plate 5 are not tightly fitted together; 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, which allows the first adhesive layer 3 to wrap around the battery 2, providing expansion space for the battery 2, protecting the battery, and reducing the probability of thermal runaway propagation.

[0065] Furthermore, the projected area of ​​battery 2 on heat exchange plate 5 is S1, the area of ​​the first adhesive layer 3 within the projection of battery 2 on heat exchange plate 5 is S2, and the ratio of S1 to S2 is in the range of 10:1 to 100:95.

[0066] The projected area of ​​battery 2 on heat exchange plate 5 is S1. The first adhesive layer 3 extends into the projected area of ​​battery 2 on heat exchange plate 5, so that the first adhesive layer 3 can be placed in the gap between battery 2 and heat exchange plate 5. The area of ​​the first adhesive layer 3 extending into the projected area is S2. The ratio of S1 to S2 is in the range of 10:1 to 100:95. If the above ratio range is too large, it may affect the heat dissipation of the battery. If the above ratio range is too small, the first adhesive layer 3 cannot properly wrap the battery and cannot provide effective protection and support for the battery.

[0067] The ratio of S1 to S2 is within the above range, which does not affect the heat dissipation of the battery, and also allows the first adhesive layer 3 to fully wrap the battery 2, providing expansion space for the battery 2 and reducing the probability of thermal runaway propagation.

[0068] For example, the ratio of S1 to S2 can be 10:1, 9:2, 20:3, 100:95, etc.

[0069] 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.

[0070] 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 both 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 range 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 0%, 6%, 12%, 25%, 30%, 38%, 42%, 50%, 63%, 76%, 83%, 90% of the height of the battery 2, etc.

[0071] Furthermore, the batteries 2 in the same battery pack are evenly spaced, and adjacent battery packs are aligned. The value of F ranges from 0.1% to 10%.

[0072] The batteries 2 in the same battery pack are evenly spaced to reduce the impact on heat dissipation of each battery 2. There are two arrangement methods between adjacent battery packs. One arrangement method is that adjacent battery packs are arranged in alignment, as shown in Figures 1-2. In this embodiment, adjacent battery packs are arranged in alignment, and the arrangement of batteries 2 in the box 1 is neat and regular. At this time, every four batteries 2 in adjacent rows form a unit, and the four batteries 2 form a rectangular structure (the four batteries are located at one corner of the rectangle). In a box 1 of the same size, the gap between batteries 2 is relatively large, and the thermal runaway rate F of the inorganic foam potting compound should be slightly larger, that is, the value of F is in the range of 0.1% to 10%. For example, the thermal runaway rate F of the inorganic foam potting compound is 0.1%, 0.8%, 1.6%, 2.2%, 3.5%, 4.9%, 5.4%, 6%, 7.6%, 8%, 9.1%, 10%, etc.

[0073] Furthermore, the batteries 2 in the same battery pack are evenly spaced, and adjacent battery packs are staggered. The value of F ranges from 0% to 9%.

[0074] Another arrangement of adjacent battery packs is an alternating arrangement. In other embodiments, the battery device can be arranged in this way. In this case, every three batteries 2 in adjacent rows form a unit, and the three batteries 2 form a triangular structure (the three batteries are located at one corner of the triangle). Within a housing 1 of the same size, the gap between the batteries 2 is relatively close, and the thermal runaway rate F of the inorganic foam potting compound should be slightly smaller, that is, the value of F is in the range of 0% to 9%. For example, the thermal runaway rate F of the inorganic foam potting compound is 0%, 1.5%, 2.7%, 3%, 4.2%, 5%, 6.4%, 7.8%, 8%, 9%, etc.

[0075] Furthermore, the hardness H of the inorganic foam potting compound after curing ranges from 40 MPa to 80 MPa.

[0076] If the hardness H of the inorganic foam potting compound is too high after curing, it will affect the battery's breathing expansion. If the hardness H of the inorganic foam potting compound is too low after curing, the bulk strength of the inorganic foam potting compound will be weakened, making it difficult to meet the battery's fixation requirements.

[0077] In this embodiment, the hardness H of the inorganic foam potting compound 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 hardness H of the inorganic foam potting compound after curing is within the above range, which can effectively fix the battery 2.

[0078] Furthermore, the cured density C of the inorganic foam potting compound is less than or equal to 0.5 g / cm³. 3 .

[0079] If the cured density (C) of the inorganic foam potting compound is too high, it will lead to an increase in the amount of compound used. In this embodiment, the cured density (C) of the inorganic foam potting compound can be 0.1 g / cm³. 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 The settings can be selected according to different battery performance requirements. When the cured density C of the inorganic foam potting compound is within the above range, it can meet the strength requirements of the inorganic foam potting compound while reducing battery weight and manufacturing costs.

[0080] Furthermore, the first adhesive layer 3 covers 1% to 90% of the outer periphery of the battery 2, and the value of F ranges from 0.1% to 9.9%.

[0081] The first adhesive layer 3 can provide insulation and heat insulation for adjacent batteries 2. The higher the proportion of the first adhesive layer 3 covering the outer periphery of the battery 2, the better the insulation and heat insulation effect of the battery 2, which can effectively prevent the problem of one battery overheating and affecting other batteries.

[0082] In this embodiment, the first adhesive layer 3 can cover 1%, 5%, 15%, 20%, 30%, 42%, 51%, 66%, 75%, 85%, 90%, etc. of the outer periphery of the battery 2. At this time, the thermal runaway rate F of the inorganic foam potting compound is in the range of 0.1% to 9.9%. For example, the thermal runaway rate F of the inorganic foam potting compound is 0.1%, 0.5%, 1.2%, 2%, 3.6%, 4.2%, 5.5%, 6%, 7.3%, 8.4%, 9.9%, etc.

[0083] Furthermore, a fixing bracket is provided on the bottom plate 101 of the box, the fixing bracket has a mounting position for mounting the battery 2, and the first adhesive layer 3 fills at least part of the gap between the mounting position and the battery 2.

[0084] The fixed bracket is set on the bottom plate 101 of the box. The fixed bracket is pre-set with an installation position. The battery 2 is suitable for installation in the installation position, such as an installation slot. The battery 2 is suitable for insertion into the installation slot so that the battery 2 can be accurately and quickly set into the box 1, thereby improving assembly efficiency.

[0085] The radial dimension of the mounting position is slightly larger than that of the battery 2 so that the battery 2 can be smoothly installed in 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 between the mounting position and the battery 2, so that the battery is more securely installed in the mounting position.

[0086] In addition, the mounting bracket can also protect the battery from adverse effects such as external vibration and heat shock.

[0087] In addition, in this embodiment, the porosity of the inorganic foam potting compound is in the range of 0 to 2 mm.

[0088] If the porosity of the inorganic foam potting compound is too high, voids will appear inside, leading to a lack of filler between adjacent cells. This can cause insulation failure between adjacent cells and allow for air heat conduction, hindering the battery's thermal insulation effect and increasing the risk of thermal runaway. Conversely, if the porosity of the inorganic foam potting compound is too low, the density will increase, resulting in increased weight and preventing the achievement of weight reduction.

[0089] In this embodiment, the porosity of the inorganic foam potting compound can be 0, 0.6 mm, 1.2 mm, 2 mm, etc., and can be selected and set according to different battery performance requirements. When the porosity of the inorganic foam potting compound is within the above range, it can achieve the effects of weight reduction and battery insulation and heat insulation.

[0090] In this embodiment, the flowability of the inorganic foam potting compound before curing is in the range of 0–1000 mm.

[0091] If the inorganic foam potting compound has excessive fluidity before curing, the flow channels will be complex and flow will be difficult, increasing the difficulty of process implementation and making it difficult to guarantee the filling effect of the narrowest internal position.

[0092] In this embodiment, the pre-curing flowability of the inorganic foam potting compound can be 0, 30 mm, 620 mm, 800 mm, 1000 mm, etc., which can be selected and set according to different battery performance requirements. Maintaining the pre-curing flowability of the inorganic foam potting compound within the above range can improve process operability and ensure product quality.

[0093] Inorganic foaming potting compound can be a low-viscosity potting compound. This low-viscosity potting compound has the characteristics of high temperature resistance, non-softening, good foaming properties, good smoothness after curing, and good absolute performance. The dust collection battery module manufactured using this low-viscosity potting compound has high temperature resistance, long service life, and can improve battery performance.

[0094] In this embodiment, the inorganic foam potting compound comprises inorganic silicates. These inorganic silicates are readily available and have low usage costs, which helps control the manufacturing cost of the battery.

[0095] In this embodiment, the battery potting compound is primarily an inorganic foaming potting compound, and may also include additives such as hydrogen peroxide, hard calcium carbonate, fly ash, and inorganic foaming potting compound foaming agents. The main component of the inorganic foaming potting compound is inorganic silicate. The refractoriness of the above-mentioned battery potting compound is greater than 700℃, and the refractoriness of the foamed inorganic foaming potting compound can reach 800℃, conforming to standard GB8624. Its combustion performance is A1 grade, classifying it as a non-combustible material. The aforementioned refractoriness, also known as melt resistance, is a performance indicator used to characterize the resistance of an object to high temperatures without melting.

[0096] Among them, the inorganic foam potting compound has a closed-cell rate of more than 90%, significantly reduces air convection heat transfer, and has a thermal conductivity of less than 0.1 W / (m·K).

[0097] Furthermore, inorganic foaming potting compounds include one or more of the following: ordinary silicate inorganic foaming potting compounds, early-strength silicate inorganic foaming potting compounds, ordinary silicate inorganic foaming potting compounds for ultra-high performance concrete, sulfoaluminate inorganic foaming potting compounds for soft underground engineering, and high-performance silicate inorganic foaming potting compounds.

[0098] Inorganic foaming potting compounds can be made of one or more materials, and the selection can be made according to different battery performance requirements. Ordinary silicate inorganic foaming potting compounds, early-strength silicate inorganic foaming potting compounds, ordinary silicate inorganic foaming potting compounds for ultra-high performance concrete, sulfoaluminate inorganic foaming potting compounds for soft underground engineering, and high-performance silicate inorganic foaming potting compounds are all relatively easy-to-obtain inorganic silicates, with low usage costs, which helps to control battery manufacturing costs.

[0099] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A cylindrical battery device characterized by comprising: The device includes a housing (1) and a battery (2). The battery (2) is fixed inside the housing (1) by an adhesive layer. The adhesive layer includes a first adhesive layer (3), which is at least partially disposed between adjacent batteries (2). The first adhesive layer (3) includes an inorganic foam potting compound. The first adhesive 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 compound, and the value of F ranges from 0% to 10%; H is the hardness of the inorganic foam potting compound after curing; C is the density of the inorganic foam potting compound after curing; d is the battery spacing, and the value of d ranges from 0.5 mm to 4 mm; μ is the flatness of the battery casing, and the value of μ ranges from 0 to 1 mm; k is a constant, k = 11 × 10⁻⁶. -3 The cured hardness H of the inorganic foam potting compound is in the range of 40 MPa to 80 MPa; the cured density C of the inorganic foam potting compound is less than or equal to 0.5 g / m³. 3 .

2. The cylindrical battery device according to claim 1, characterized by The adhesive layer also includes a second adhesive layer (4), which is at least partially disposed between the bottom plate of the housing (101) and the battery (2), and the side of the second adhesive layer (4) facing away from the bottom plate of the housing (101) is connected to the first adhesive layer (3).

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

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

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

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

7. The cylindrical battery device according to claim 6, characterized by 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).

8. The cylindrical battery device according to claim 2, characterized by Multiple batteries (2) are provided, and the multiple batteries (2) are arranged in a row. The batteries (2) in the same row form a battery pack. A heat exchange plate (5) is provided between adjacent battery packs. The heat exchange plate (5) is arranged perpendicular to the bottom plate (101) of the box.

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

10. The cylindrical battery device according to claim 9, characterized by The projected area of ​​the battery (2) on the heat exchange plate (5) is S1. The first adhesive layer (3) enters the projection of the battery (2) on the heat exchange plate (5). The area of ​​the first adhesive layer (3) entering the projection is S2. 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 by 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 0% to 90% of the height of the battery (2).

12. The cylindrical battery device according to claim 8, characterized by The batteries (2) of the same battery pack are evenly spaced, and adjacent battery packs are aligned. The value of F ranges from 0.1% to 10%.

13. The cylindrical battery device according to claim 8, characterized by The batteries (2) of the same battery pack are evenly spaced, and adjacent battery packs are staggered. The value of F ranges from 0% to 9%.

14. The cylindrical battery device according to claim 1, characterized by The first adhesive layer (3) covers 1% to 90% of the outer periphery of the battery (2), and the value of F ranges from 0.1% to 9.9%.

15. The cylindrical battery device according to any one of claims 1-14, wherein The box bottom plate (101) is provided with a fixing support, the fixing support has a mounting position for arranging the battery (2), and the first adhesive layer (3) fills the gap between the mounting position and the battery (2).

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