A spacer ring, a battery and an electric device

Abstract

A kind of spacer ring, battery and electric equipment, spacer ring includes spacer ring main body and filler;Filler is combined in spacer ring main body, filler decomposes and generates gas at 100 DEG C-600 DEG C.By the above settings, spacer ring main body provides structural support for filler, and both together form the spacer ring of battery cell;When battery cell thermal runaway, cause the temperature of battery cell inside too high, so that the temperature of spacer ring rises to the decomposition temperature of the above filler, so that the filler decomposes and absorbs heat, thereby reducing the temperature inside battery cell, and the gas generated by filler decomposition will also increase the pressure inside battery cell, so that the air pressure in battery cell is larger, thereby assisting the pressure relief of explosion-proof valve to prevent the development of thermal runaway.

Description

A separator, battery and electrical device Technical Field

[0001] This application relates to the field of battery technology, specifically to a separator, a battery, and an electrical device. Background Technology

[0002] With increasingly stringent requirements for battery performance, battery safety issues are becoming more prominent, and high-safety, high-stability batteries are receiving more and more attention. Preventing thermal runaway in battery cells is crucial for the safety of individual cells. Adding flame-retardant electrolyte additives, ceramic separators, or flame-retardant gels inside the cell to prevent thermal runaway can affect the electrochemical performance of the individual cell, leading to performance degradation. Conversely, using mica flame-retardant sheets on the outside of the cell to prevent thermal runaway increases battery module costs, reduces energy density, and decreases usable space. Summary of the Invention

[0003] The purpose of this application is to provide a separator, a battery, and an electrical device that solves the problem of preventing thermal runaway of the battery cell without affecting the existing performance of the battery cell.

[0004] To achieve the objectives of this application, the following technical solution is provided:

[0005] In a first aspect, the present invention provides a spacer ring, comprising a spacer ring body and a packing material; the packing material is incorporated in the spacer ring body, and the packing material decomposes at 100°C to 600°C to generate gas.

[0006] In one embodiment, the mass percentage of the spacer body is 20% to 95%, and the mass percentage of the filler is 5% to 80%.

[0007] In one embodiment, the material of the spacer body includes at least one selected from polyimide, polypropylene, polyphenylene sulfide, polyethylene terephthalate, polyethylene, polyvinyl chloride, high-density polyethylene, low-density polyethylene, and polystyrene.

[0008] In one embodiment, the packing includes organic packing and / or inorganic packing, wherein when the packing includes organic packing, the material type of the organic packing is different from the material type of the spacer body.

[0009] In one embodiment, when the filler includes an organic filler, the organic filler includes at least one selected from polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyacrylic acid, polymethyl methacrylate, polyvinyl alcohol, polyacrylamide, and acrylonitrile-butadiene-styrene copolymer resin.

[0010] In one embodiment, when the filler includes an organic filler, the organic filler decomposes at 250°C to 600°C to generate gas.

[0011] In one embodiment, when the filler comprises an inorganic filler, the inorganic filler comprises at least one of ammonium chloride, ammonium sulfate, ammonium bisulfate, ammonium nitrate, ammonium iodide, sodium bromide, ammonium bicarbonate, ammonium carbonate, sodium carbonate, sodium bicarbonate, silver carbonate, potassium carbonate, and potassium bicarbonate.

[0012] In one embodiment, when the packing includes inorganic packing, the inorganic packing decomposes at 100°C to 400°C to generate gas.

[0013] In one embodiment, when the packing includes organic packing and inorganic packing, the mass ratio of the organic packing in the spacer is 2.5% to 40%; and the mass ratio of the inorganic packing in the spacer is 2.5% to 40%.

[0014] In one embodiment, the spacer body further has a hollow cavity, and at least part of the filler is filled in the hollow cavity.

[0015] In a second aspect, the present invention provides a battery comprising a battery body and a spacer as described in any of the first aspects, the spacer being adapted to protect the battery.

[0016] Thirdly, the present invention provides an electrical device, the electrical device comprising an appliance and a battery as described in the second aspect.

[0017] This invention provides a spacer ring, comprising a spacer ring body and packing material. The packing material is integrated into the spacer ring body and decomposes to generate gas at 100℃ to 600℃. Through this configuration, the spacer ring body provides structural support for the packing material, and the two together form the spacer ring of the battery cell. When the battery cell experiences thermal runaway, the internal temperature becomes excessively high, causing the spacer ring temperature to rise to the decomposition temperature of the packing material. This causes the packing material to decompose and absorb heat, thereby reducing the internal temperature of the battery cell. Furthermore, the gas generated by the packing material decomposition increases the internal pressure of the battery cell, thus increasing the internal gas pressure and assisting the explosion-proof valve in releasing pressure to prevent the development of thermal runaway. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 is a schematic diagram of the spacer structure according to an embodiment;

[0020] Figure 2 shows the thermal runaway test results of Example 1;

[0021] Figure 3 shows the thermal runaway test results for Comparative Example 1.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1-Spacer ring; 2-Spacer ring body; 3-Filling; 31-Inorganic filler; 32-Organic filler; 4-Hollow cavity. Detailed Implementation

[0024] 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 a part of the embodiments of this application, and not all of them. 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.

[0025] It should be noted that when a component is said to be "fixed" to another component, it can be directly on the other component or it can be in a middle component. When a component is said to be "connected" to another component, it can be directly connected to the other component or it may be in a middle component.

[0026] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0027] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0028] In one embodiment, the present invention provides a spacer ring 1. Referring to FIG1, the spacer ring 1 includes a spacer ring body 2 and a packing 3. The packing 3 is incorporated into the spacer ring body 2, and the packing 3 decomposes to generate gas at 100°C to 600°C. Optionally, the packing 3 decomposes to generate gas at temperatures including but not limited to 100°C, 150°C, 200°C, 250°C, 300°C, 350°C, 400°C, 450°C, 500°C, 550°C, and 600°C.

[0029] Spacer 1 is used to gather the positive and negative tabs of the battery cell, preventing damage to the tabs. Filler 3 is placed within spacer 1. When thermal runaway occurs in the battery cell, filler 3 decomposes at high temperatures. The decomposition reaction of filler 3 absorbs heat, thereby lowering the temperature of the battery cell and slowing down and preventing further temperature increases inside the cell. Simultaneously, the decomposition of filler 3 generates a large amount of gas, increasing the internal pressure of the battery cell. This causes the safety valve of the battery cell to open prematurely, reducing the risk of clogging the explosion-proof valve, thus releasing heat and pressure inside the battery cell and lowering the temperature of the battery cell itself. The released gas can also carry away a large amount of electrolyte, blocking ion channels inside the battery cell, thereby stopping the chemical reaction of the battery and further preventing the development of thermal runaway.

[0030] The packing 3 is integrated into the spacer body 2, which provides a frame and structural support, withstands the mechanical stress of the spacer 1 during normal use, and forms the spacer 1 that meets mechanical performance requirements. When the packing 3 in the spacer 1 decomposes, it prevents the spacer body 2 from blocking the explosion-proof valve and preventing heat dissipation of the battery cell during thermal runaway.

[0031] The gases produced by the decomposition of the filler at temperatures between 100℃ and 600℃ can absorb heat when the battery's internal temperature rises due to overcharging, over-discharging, mechanical damage, or external heat sources, preventing further temperature increases and thus avoiding thermal runaway. If the filler decomposes below 100℃, triggering the decomposition mechanism within the battery's normal operating temperature range, it can lead to decreased battery performance or premature failure. If the filler decomposes only above 600℃, the safety mechanism may not activate when the battery has already reached a dangerously high temperature, failing to prevent thermal runaway in time. The gases produced during decomposition can be non-combustible gases such as carbon dioxide, carbon monoxide, nitrogen, and ammonia.

[0032] This invention provides a spacer ring 1, which includes a spacer ring body 2 and a packing 3. The packing 3 is integrated into the spacer ring body 2, and the packing decomposes to generate gas at 100℃ to 600℃. Through this arrangement, the spacer ring body provides structural support for the packing, and the two together form the spacer ring of the battery cell. When the battery cell experiences thermal runaway, the internal temperature of the battery cell becomes excessively high, causing the spacer ring temperature to rise to the decomposition temperature of the packing. This causes the packing to decompose and absorb heat, thereby reducing the internal temperature of the battery cell. Furthermore, the gas generated by the packing decomposition increases the internal pressure of the battery cell, thus increasing the internal gas pressure and assisting the explosion-proof valve in releasing pressure to prevent the development of thermal runaway.

[0033] In one embodiment, the mass percentage of the spacer body is 20% to 95%, and the mass percentage of the filler is 5% to 80%. Optionally, the mass percentage of the spacer body can be, but is not limited to, 20%, 30%, 40%, 50%, 60%, 70%, 80%, or 95%. The mass percentage of the filler can be, but is not limited to, 5%, 15%, 25%, 35%, 45%, 55%, 65%, 75%, or 80%.

[0034] Within this mass ratio, the separator body and filler provide strong mechanical strength and good structural stability, while the filler provides a suitable decomposition reaction to prevent the occurrence and escalation of thermal runaway in the battery cell. When the separator body accounts for more than 95% of the mass and the filler accounts for less than 5%, the filler is too small. When the battery overheats, it can absorb less heat and produce less gas, which may not be enough to allow the gas to break through the explosion-proof valve and carry away the electrolyte, thus failing to effectively prevent the development of thermal runaway. When the separator body accounts for less than 20% of the mass and the filler accounts for more than 80%, the separator body is too small and cannot provide sufficient mechanical strength and structural stability.

[0035] In one embodiment, the material of the spacer body includes at least one selected from polyimide, polypropylene, polyphenylene sulfide, polyethylene terephthalate, polyethylene, polyvinyl chloride, high-density polyethylene, low-density polyethylene, and polystyrene.

[0036] Optionally, the material of the spacer body can be one of polyimide, polypropylene, polyphenylene sulfide, polyethylene terephthalate, polyethylene, polyvinyl chloride, high-density polyethylene, low-density polyethylene, and polystyrene. It can also be any combination of multiple materials selected from polyimide, polypropylene, polyphenylene sulfide, polyethylene terephthalate, polyethylene, polyvinyl chloride, high-density polyethylene, low-density polyethylene, and polystyrene.

[0037] In one embodiment, referring to FIG1, the packing 3 includes organic packing 32 and / or inorganic packing 31. When the packing includes organic packing, the material type of the organic packing is different from the material type of the spacer body.

[0038] Inorganic filler 31 begins to decompose at lower temperatures, making it suitable for preventing thermal runaway at lower temperatures; organic filler 32 has higher thermal stability, making it suitable for preventing thermal runaway at higher temperatures. The combination of organic filler 32 and inorganic filler 31 provides complementary properties, offering a wider range of thermal runaway protection.

[0039] In one embodiment, when the filler includes organic filler, the material of the separator body is different from that of the organic filler, and different organic materials have different thermal decomposition temperatures. The decomposition temperature of the organic filler can be designed as needed to activate the protection mechanism under thermal runaway conditions. If the separator body material and the organic filler are the same, their thermal decomposition behaviors will occur simultaneously, making it impossible to effectively control the thermal runaway of the battery cell. That is, when the separator body material is polypropylene, the organic filler material is at least one of polyethylene, polyvinyl chloride, polyvinylidene chloride, polyacrylic acid, polymethyl methacrylate, polyvinyl alcohol, polyacrylamide, and acrylonitrile-butadiene-styrene copolymer resin. When the separator body material is polyethylene, the organic filler material is at least one of polypropylene, polyvinyl chloride, polyvinylidene chloride, polyacrylic acid, polymethyl methacrylate, polyvinyl alcohol, polyacrylamide, and acrylonitrile-butadiene-styrene copolymer resin. When the separator body material is polyvinyl chloride, the organic filler material is at least one of polyethylene, polypropylene, polyvinylidene chloride, polyacrylic acid, polymethyl methacrylate, polyvinyl alcohol, polyacrylamide, and acrylonitrile-butadiene-styrene copolymer resin.

[0040] In one embodiment, when the filler includes an organic filler, the organic filler includes at least one selected from polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyacrylic acid, polymethyl methacrylate, polyvinyl alcohol, polyacrylamide, and acrylonitrile-butadiene-styrene copolymer resin.

[0041] Optionally, the organic filler can be one of polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyacrylic acid, polymethyl methacrylate, polyvinyl alcohol, polyacrylamide, or acrylonitrile-butadiene-styrene copolymer resin. It can also be any combination of multiple of these resins.

[0042] In one embodiment, when the packing includes organic packing, the organic packing decomposes to generate gas at 250°C to 600°C. Optionally, the organic packing may decompose to generate gas at, but is not limited to, 250°C, 300°C, 350°C, 400°C, 450°C, 500°C, 550°C, or 600°C.

[0043] In one embodiment, the decomposition temperature of polyethylene is 470℃-550℃, the decomposition temperature of polypropylene is 200℃-450℃, the decomposition temperature of polyvinyl chloride is 220℃-280℃, the decomposition temperature of polyvinylidene chloride is 210℃-225℃, the decomposition temperature of polyacrylic acid is 250℃-350℃, the decomposition temperature of polymethyl methacrylate is 260℃-280℃, the decomposition temperature of polyvinyl alcohol is 230℃-260℃, the decomposition temperature of polyacrylamide is 290℃-310℃, and the decomposition temperature of acrylonitrile-butadiene-styrene copolymer resin is 250℃-270℃.

[0044] Organic fillers decompose within a temperature range of 250℃ to 600℃. In the event of thermal runaway, the organic fillers can decompose promptly, absorbing heat and preventing further temperature increases. They also generate gas, which opens the explosion-proof valve, carrying out a large amount of electrolyte and blocking ion channels within the cell, thus stopping the battery's chemical reactions and further preventing the development of thermal runaway. When organic fillers decompose below 250℃, the decomposition mechanism is triggered within the battery's normal operating temperature range, leading to decreased battery performance or premature failure. When organic fillers decompose above 600℃, the internal battery temperature becomes too high, and the decomposition of the organic fillers is insufficient to absorb enough heat to slow the development of thermal runaway, resulting in battery damage or even explosion.

[0045] In one embodiment, when the packing includes inorganic packing, the inorganic packing includes at least one of ammonium chloride, ammonium sulfate, ammonium bisulfate, ammonium nitrate, ammonium iodide, sodium bromide, ammonium bicarbonate, ammonium carbonate, sodium carbonate, sodium bicarbonate, silver carbonate, potassium carbonate, and potassium bicarbonate.

[0046] Optionally, the inorganic filler can be one of the following: ammonium chloride, ammonium sulfate, ammonium bisulfate, ammonium nitrate, ammonium iodide, sodium bromide, ammonium bicarbonate, ammonium carbonate, sodium carbonate, sodium bicarbonate, silver carbonate, potassium carbonate, and potassium bicarbonate. It can also be any combination of multiple options from the following: ammonium chloride, ammonium sulfate, ammonium bisulfate, ammonium nitrate, ammonium iodide, sodium bromide, sodium bicarbonate, ammonium carbonate, sodium carbonate, sodium bicarbonate, silver carbonate, potassium carbonate, and potassium bicarbonate.

[0047] In one embodiment, when the packing includes inorganic packing, the inorganic packing decomposes at 100°C to 400°C to generate gas.

[0048] Inorganic fillers decompose within a temperature range of 100℃ to 400℃. In the event of thermal runaway, these fillers can decompose promptly, absorbing heat and preventing further temperature increases. They also generate gas, which opens the explosion-proof valve, carrying out a large amount of electrolyte and blocking ion channels within the battery cell, thus stopping the chemical reaction and further preventing the development of thermal runaway. When inorganic fillers decompose below 100℃, the decomposition mechanism is triggered within the normal operating temperature range of the battery, leading to decreased battery performance or premature failure. When inorganic fillers decompose above 400℃, the internal temperature of the battery is too high, and the decomposition of the inorganic fillers is insufficient to absorb enough heat to slow the development of thermal runaway, leading to battery damage or even explosion.

[0049] The decomposition temperatures of the following compounds are as follows: ammonium chloride 330℃-340℃, ammonium sulfate 210℃-230℃, ammonium bisulfate 190℃-210℃, ammonium nitrate 220℃-240℃, ammonium iodide 230℃-240℃, sodium bromide 390℃-410℃, ammonium bicarbonate 300℃-350℃, ammonium carbonate 240℃-260℃, sodium carbonate 390℃-410℃, sodium bicarbonate 260℃-280℃, silver carbonate 390℃-410℃, potassium carbonate 260℃-280℃, and potassium bicarbonate 390℃-410℃.

[0050] In one embodiment, when the packing includes organic and inorganic packing, the mass ratio of organic packing in the spacer is 2.5% to 40%; the mass ratio of inorganic packing in the spacer is 2.5% to 40%. Optionally, the mass ratio of organic packing in the spacer can be, but is not limited to, 2.5%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, or 40%. The mass ratio of inorganic packing in the spacer can be, but is not limited to, 2.5%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, or 40%.

[0051] When the packing includes both organic and inorganic packing, and the ratio of organic to inorganic packing is within a certain range, the combination of organic and inorganic packing provides complementary properties, offering a wider range of thermal runaway protection. When the organic packing content is less than 2.5%, the packing cannot prevent thermal runaway at higher temperatures. When the inorganic packing content is less than 2.5%, the packing cannot prevent thermal runaway at lower temperatures. When the organic packing content is greater than 40%, the excessive mass percentage of the packing and insufficient bulk material of the spacers will result in the spacers failing to provide sufficient mechanical strength and structural stability. Similarly, when the inorganic packing content is greater than 40%, the excessive mass percentage of the packing and insufficient bulk material of the spacers will result in the spacers failing to provide sufficient mechanical strength and structural stability.

[0052] In one embodiment, the filler is uniformly dispersed in the spacer body.

[0053] In this embodiment, the filler is mixed with the spacer body material. After thorough mixing, the filler is uniformly dispersed within the spacer body. The uniformly dispersed powder is then molded to form the spacer. The uniform dispersion of the filler within the spacer body results in a spacer structure with uniform filler. When the temperature inside the battery cell becomes too high, the filler uniformly dispersed within the spacer body begins to decompose, absorbing heat and thus lowering the battery cell temperature, slowing down and preventing further temperature increases. Simultaneously, the decomposition of the filler generates a large amount of gas, increasing the internal pressure of the battery cell. This causes the safety valve of the battery cell to open prematurely, reducing the risk of clogging the explosion-proof valve, thereby releasing internal heat and pressure and lowering the temperature of the battery cell itself. Furthermore, the uniform dispersion of the filler within the spacer body ensures the uniformity of decomposition, allowing for precise control of the decomposition reaction.

[0054] In one embodiment, the spacer body 2 also has a hollow cavity 4, and at least part of the filler 3 is filled in the hollow cavity 4.

[0055] A hollow cavity 4 is formed in the main body 2 of the spacer ring, and at least part of the filler 3 is filled in the hollow cavity 4, thereby housing the filler 3 inside the hollow cavity 4. When the temperature inside the battery cell is too high, the filler 3 housed in the hollow cavity 4 begins to decompose, absorbing heat, thereby reducing the temperature of the battery cell and slowing down and preventing the temperature inside the battery cell from rising further. At the same time, the decomposition of the filler 3 generates a large amount of gas, which increases the pressure inside the battery cell, causing the safety valve of the battery cell to open in advance, reducing the risk of blocking the explosion-proof valve, thereby releasing the heat and pressure inside the battery cell and reducing the temperature of the battery cell body.

[0056] In one embodiment, the present invention provides a battery comprising a battery body and a spacer as described in any of the above embodiments, the spacer being adapted to protect the battery from thermal runaway.

[0057] In one embodiment, the present invention provides an electrical device, which includes an electrical appliance and a battery as described in the above embodiments.

[0058] The technical solution of the present invention will be described in detail below through specific embodiments.

[0059] Example 1

[0060] This embodiment provides a spacer ring, which includes a spacer ring body and filler; the filler is incorporated into the spacer ring body. The filler includes organic filler and inorganic filler, wherein the organic filler is made of acrylic resin and the inorganic filler is made of ammonium carbonate. The spacer ring body is made of polyethylene terephthalate. The organic filler accounts for 35% of the mass of the spacer ring, the inorganic filler accounts for 35% of the mass of the spacer ring, and the spacer ring body accounts for 30% of the mass of the spacer ring.

[0061] The method for manufacturing the spacer in this embodiment is as follows:

[0062] (1) Mix the organic filler, inorganic filler and spacer body materials to obtain powder A;

[0063] (2) Powder A is hot-pressed in a mold at 260°C to form a spacer with a hollow cavity;

[0064] (3) Filler is injected into the hollow cavity and sealed to obtain a spacer ring.

[0065] Example 2

[0066] The difference between Example 2 and Example 1 is that the organic filler accounts for 40% of the mass of the spacer, the inorganic filler accounts for 40% of the mass of the spacer, and the main body of the spacer accounts for 20% of the mass of the spacer.

[0067] The method for manufacturing the spacer in Example 2 is the same as that in Example 1.

[0068] Example 3

[0069] The difference between Example 3 and Example 1 is that the organic filler accounts for 2.5% of the mass of the spacer, the inorganic filler accounts for 2.5% of the mass of the spacer, and the main body of the spacer accounts for 95% of the mass of the spacer.

[0070] The method for manufacturing the spacer in Example 3 is the same as that in Example 1.

[0071] Example 4

[0072] The difference between Example 4 and Example 1 is that the organic filler accounts for 7.5% of the mass of the spacer, the inorganic filler accounts for 2.5% of the mass of the spacer, and the main body of the spacer accounts for 90% of the mass of the spacer.

[0073] Example 5

[0074] The difference between Example 5 and Example 1 is that the packing material contains only organic packing material, and the organic packing material accounts for 70% of the mass of the spacer.

[0075] The method for manufacturing the spacer in Example 5 is the same as that in Example 1.

[0076] Example 6

[0077] The difference between Example 6 and Example 1 is that the packing material contains only inorganic packing material, and the inorganic packing material accounts for 70% of the mass of the spacer.

[0078] The method for manufacturing the spacer in Example 6 is the same as that in Example 1.

[0079] Example 7

[0080] The difference between Example 7 and Example 1 is that the organic filler is made of polyethylene.

[0081] The method for manufacturing the spacer in Example 7 is the same as that in Example 1.

[0082] Example 8

[0083] The difference between Example 8 and Example 1 is that the inorganic filler material is ammonium chloride.

[0084] The method for manufacturing the spacer in Example 8 is the same as that in Example 1.

[0085] Example 9

[0086] The difference between Example 9 and Example 1 is that the material of the spacer body is polyimide.

[0087] The method for manufacturing the spacer in Example 9 is the same as that in Example 1.

[0088] Example 10

[0089] The difference between Example 10 and Example 1 is that the spacer ring does not have a hollow cavity.

[0090] The method for manufacturing the spacer in Example 10 is the same as that in Example 1.

[0091] Comparative Example 1

[0092] The difference between Comparative Example 1 and Example 1 is that the spacer does not include filler and is made only of polyethylene terephthalate.

[0093] For the spacers obtained in Examples 1-10 and Comparative Example 1, thermal runaway tests were conducted using the test method of GB / T-36276-2023: the obtained spacers, positive electrode, negative electrode, separator, electrolyte, and cell casing were assembled into a complete cell. Then, the maximum temperature of the cells obtained in Examples 1-10 and Comparative Example 1 during the thermal runaway test was recorded.

[0094] Table 1 shows the results of the above tests; Figure 2 shows the thermal runaway test results of Example 1; Figure 3 shows the thermal runaway test results of Comparative Example 1.

[0095] Table 1

[0096] Maximum Temperature (°C) of Test Items Example 1: 198.1 Example 2: 175.2 Example 3: 311.3 Example 4: 289.2 Example 5: 215.5 Example 6: 221.3 Example 7: 211.9 Example 8: 200.1 Example 9: 189.3 Example 10: 261.5 Comparative Example 1: 398.4 surface

[0097] Compared with Comparative Example 1, Examples 1-10 are compared with Example 1. When filler is placed in the spacer body, the internal temperature of the battery cell becomes too high when thermal runaway occurs. The filler decomposes and absorbs heat, thereby reducing the internal temperature of the battery cell and preventing the development of thermal runaway.

[0098] Comparing Examples 1-2 with Examples 3-4, when the mass percentage of the filler in the spacer is within a suitable range, the spacer body can provide strong mechanical strength and good structural stability, and the filler can provide a suitable decomposition reaction, preventing the occurrence and aggravation of thermal runaway in the battery cell. At this point, the higher the mass percentage of the filler in the spacer, the lower the maximum internal temperature of the battery cell. This is because the filler absorbs heat through thermal decomposition, reducing the internal temperature of the battery cell and thus helping to control the development of thermal runaway.

[0099] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art will understand that all or part of the processes for implementing the above embodiments and equivalent variations made in accordance with the claims of this application are still within the scope of this application.

Claims

1. A spacer ring, characterized in that, include: The separator body; a filler incorporated within the separator body, the filler decomposes to generate gas at 100℃~600℃; wherein, the filler and the material of the separator body are thoroughly mixed to form a uniformly dispersed powder, and the separator is formed by hot pressing the powder to ensure that the filler is uniformly dispersed within the separator body; the filler includes organic filler and inorganic filler, the material type of the organic filler being different from that of the separator body; the separator is used to gather the positive and negative tabs of the battery cell, and the filler is used to decompose to absorb heat.

2. The spacer according to claim 1, characterized in that, In the spacer ring, the mass percentage of the spacer ring body is 20% to 95%; the mass percentage of the filler is 5% to 80%.

3. The spacer according to claim 1, characterized in that, The material of the spacer body includes at least one of polyimide, polypropylene, polyphenylene sulfide, polyethylene terephthalate, polyethylene, polyvinyl chloride, high-density polyethylene, low-density polyethylene, and polystyrene.

4. The spacer according to claim 1, characterized in that, The organic filler includes at least one of polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyacrylic acid, polymethyl methacrylate, polyvinyl alcohol, polyacrylamide, and acrylonitrile-butadiene-styrene copolymer resin.

5. The spacer according to claim 1, characterized in that, When the filler includes organic filler, the organic filler decomposes at 250°C to 600°C to generate gas.

6. The spacer according to claim 1, characterized in that, When the filler includes inorganic filler, the inorganic filler includes at least one of ammonium chloride, ammonium sulfate, ammonium bisulfate, ammonium nitrate, ammonium iodide, sodium bromide, ammonium bicarbonate, ammonium carbonate, sodium carbonate, sodium bicarbonate, silver carbonate, potassium carbonate, and potassium bicarbonate.

7. The spacer according to claim 1, characterized in that, When the packing material includes inorganic packing material, the inorganic packing material decomposes at 100℃~400℃ to generate gas.

8. The spacer according to claim 1, characterized in that, When the packing includes organic packing and inorganic packing, the mass ratio of the organic packing in the spacer is 2.5% to 40%; and / or, the mass ratio of the inorganic packing in the spacer is 2.5% to 40%.

9. The spacer according to any one of claims 1-8, characterized in that, The spacer body also has a hollow cavity, and at least part of the filler is filled in the hollow cavity.

10. A battery, characterized in that, The battery includes a battery body and a spacer as described in any one of claims 1-9, the spacer being adapted to protect the battery.

11. An electrical appliance, characterized in that, The electrical equipment includes electrical appliances and the battery as described in claim 10.

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