Battery monomer, battery module and power utilization device

Abstract

The utility model relates to the technical field of electric vehicle batteries, and discloses a battery monomer, a battery module and an electric device. Each single battery comprises a shell, a top cover assembly, a battery cell assembly and a flame-retardant assembly, the shell and the top cover assembly define a containing cavity, the top cover assembly comprises a cover plate and lower plastic, the cover plate is connected with the shell, and the lower plastic is arranged on the side, facing the containing cavity, of the cover plate; the battery core assembly is arranged in the accommodating cavity; the flame-retardant assembly is connected with the lower plastic, the flame-retardant assembly comprises a sealing shell and an electrolyte curing agent, a sealing cavity is defined by the sealing shell, or the sealing shell and the lower plastic, or the sealing shell, the lower plastic and the cover plate, the electrolyte curing agent is arranged in the sealing cavity, and the sealing cavity can be opened when the temperature in the single battery is greater than or equal to a preset temperature. According to the battery monomer, flame retardance can be effectively and reliably realized, and the electrochemical performance of the electrolyte is not influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of electric vehicle batteries, in particular to a battery monomer, a battery module and an electric device. Background Art

[0002] The safety issues of liquid batteries have received widespread attention. Lithium-ion batteries are prone to thermal runaway, fire, and even explosion due to factors such as mechanical abuse (such as collision and extrusion), electrical abuse (such as overcharging, over-discharging, and short circuit), and thermal abuse (such as high temperature and overheating).

[0003] At present, in order to prevent batteries from exploding or catching fire, the main measure is to add flame retardants to the electrolyte. The flame retardant effect of this method increases with the increase of the flame retardant dosage. However, when the amount of flame retardant added increases, it will seriously affect the electrochemical properties of the battery itself. The addition of flame retardants to the electrolyte is carried out under the premise of sacrificing the electrochemical properties of the battery. Utility Model Content

[0004] One purpose of the present utility model is to provide a battery cell that can effectively and reliably perform flame retardancy without affecting the electrochemical properties of the electrolyte.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] Battery cells, including:

[0007] A housing and a top cover assembly, wherein the housing and the top cover assembly enclose a receiving cavity, the top cover assembly comprising a cover plate and a lower plastic, the cover plate being connected to the housing, and the lower plastic being arranged on a side of the cover plate facing the receiving cavity;

[0008] A battery cell assembly is arranged in the accommodating cavity;

[0009] A flame retardant component is connected to the lower plastic, and the flame retardant component includes a sealing shell and an electrolyte curing agent. The sealing shell, or the sealing shell and the lower plastic, or the sealing shell, the lower plastic, and the cover plate are surrounded to form a sealed cavity. The electrolyte curing agent is arranged in the sealed cavity. The sealed cavity can be opened when the temperature inside the battery cell is greater than or equal to a preset temperature.

[0010] As an optional solution, a through hole is opened on the side wall of the sealed cavity facing the accommodating cavity, and the flame retardant component also includes a sealant, which is filled in the through hole and can melt when the temperature inside the battery cell is greater than or equal to a preset temperature.

[0011] As an optional solution, the through hole is provided on a side wall of the sealed cavity opposite to the battery cell assembly; and / or

[0012] A plurality of through holes are provided on the side wall of the sealed cavity.

[0013] As an optional solution, the sealing shell melts when the temperature inside the battery cell is greater than or equal to a preset temperature.

[0014] As an optional solution, the mass of the electrolyte curing agent is m1, the mass of the electrolyte of the battery cell is m2, and m1 / m2=1%-20%.

[0015] As an optional solution, the sealing shell is arranged on the side of the lower plastic facing the battery core assembly, the sealing shell is provided with an opening, the side of the sealing shell with the opening is against the lower plastic, and the sealing shell and the lower plastic are surrounded to form a sealed cavity.

[0016] As an optional solution, the sealing shell is constructed in an annular shape and is arranged between the lower plastic and the cover plate. The sealing shell, the lower plastic and the cover plate are jointly arranged to form the sealing cavity.

[0017] As an optional solution, the sealing shell and the lower plastic are integrally formed, and the sealing shell is adhesively connected to the cover plate; or

[0018] The sealing shell is connected to the cover plate by welding and is bonded to the lower plastic.

[0019] As an optional solution, the sealing shell surrounds and forms the sealing cavity, and the sealing shell is connected to a side of the lower plastic facing the battery core assembly.

[0020] As an optional solution, the top cover assembly further includes a pole, and the flame retardant assembly is arranged close to the pole.

[0021] Another object of the present invention is to provide a battery module that uses the above-mentioned battery cells to achieve good battery performance and effective flame retardancy.

[0022] To achieve this purpose, the present invention adopts the following technical solutions:

[0023] A battery module comprises at least one of the above-mentioned battery cells.

[0024] Another object of the present invention is to provide an electrical device that uses the above-mentioned battery module to achieve good battery performance and high safety.

[0025] To achieve this purpose, the present invention adopts the following technical solutions:

[0026] An electrical device includes the battery module.

[0027] The beneficial effects of the utility model are:

[0028] In the battery cell of the present invention, when the battery cell is operating normally, the electrolyte curing agent is sealed in the sealed shell and does not come into contact with the electrolyte, so it does not affect the electrochemical properties of the electrolyte; when the battery cell has a temperature greater than or equal to a preset temperature due to thermal runaway, the sealed cavity formed by the flame retardant component opens, and the electrolyte curing agent in the sealed cavity enters the accommodating cavity, and the electrolyte curing agent reacts with the electrolyte to solidify the electrolyte, thereby stopping the battery cell from working, avoiding the problem of explosion or fire caused by continuous increase in the temperature of the battery cell, and thus playing an effective and reliable flame retardant role for the battery cell.

[0029] The battery module of the utility model has good battery performance and is effectively flame retardant by adopting the above-mentioned battery monomer.

[0030] The power-consuming device of the utility model adopts the above-mentioned battery module, so the battery has good performance and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a battery cell provided by a specific embodiment of the present utility model;

[0032] Figure 2 This is an exploded view of a battery cell provided in Example 1 of the present utility model;

[0033] Figure 3 This is a bottom view of the lower insulating member and the flame retardant assembly provided in the first embodiment of the present invention;

[0034] Figure 4 This is a cross-sectional view of the lower insulating member and the flame retardant assembly provided in the first embodiment of the present invention;

[0035] Figure 5 This is an exploded view of the top cover assembly provided in the second embodiment of the present utility model;

[0036] Figure 6 This is a structural diagram of the lower plastic and the sealing shell provided in the second embodiment of the present invention.

[0037] In the picture:

[0038] 10. Shell;

[0039] 20. Top cover assembly;

[0040] 21. Cover plate; 211. Pole hole; 212. Liquid injection hole; 213. Explosion-proof hole;

[0041] 22, lower plastic; 221, first avoidance hole; 222, second avoidance hole; 223, third avoidance hole;

[0042] 23. Plastic coating; 24. Pressing block; 25. Positive pole; 26. Negative pole; 27. Explosion-proof assembly; 271. Explosion-proof disk; 272. Protective film;

[0043] 30. Battery cell components;

[0044] 40. Flame retardant component; 41. Sealing shell; 411. Through hole; 42. Electrolyte curing agent; 43. Sealant;

[0045] 50. Adapter. DETAILED DESCRIPTION

[0046] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0047] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0048] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0049] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0050] Example 1

[0051] This embodiment provides a battery cell, such as Figure 1-Figure 2 As shown, the battery cell includes a housing 10, a top cover assembly 20, and a cell assembly 30. The housing 10 and the top cover assembly 20 enclose a housing cavity, and the cell assembly 30 is disposed within the housing cavity. It is understood that to ensure the normal operation of the cell assembly 30, an electrolyte is also injected into the housing cavity.

[0052] like Figure 2 As shown, the outer shell 10 has an opening on one side, and the top cover assembly 20 is installed in the opening to ensure the sealing of the storage cavity and prevent electrolyte leakage. In this embodiment, the battery cell is a prismatic battery, so the outer shell 10 is constructed as a rectangular shell with an opening on one side. In other embodiments, the battery cell can also be a cylindrical battery. In this case, the outer shell 10 is constructed as a cylindrical shell with an opening on one side.

[0053] like Figure 2 As shown, the top cover assembly 20 includes a cover plate 21, a terminal, an upper plastic 23, and a lower plastic 22. The cover plate 21 is connected to the outer shell 10, the lower plastic 22 is arranged on the inner side of the cover plate 21 (i.e., the side of the cover plate 21 facing the accommodating cavity), and the upper plastic 23 is arranged on the outer side of the cover plate 21 (i.e., the side of the cover plate 21 facing away from the accommodating cavity). In this embodiment, the terminal has a split structure, with the first part arranged on the side of the cover plate 21 facing the accommodating cavity, and the second part passing through the upper plastic 23, cover plate 21, and lower plastic 22 and then connected to the first part, realizing communication between the battery cell assembly 30 and the outside of the battery.

[0054] In this embodiment, the electrodes include a positive electrode 25 and a negative electrode 26, each of which is provided with an upper plastic 23. The cover 21 is provided with two electrode holes 211, and the lower plastic 22 is provided with two first avoidance holes 221. Each first avoidance hole 221 is provided opposite to a corresponding electrode hole 211. The positive electrode 25 is sequentially penetrated by the corresponding first avoidance holes 221 and the electrode holes 211, and the negative electrode 26 is sequentially penetrated by another set of corresponding first avoidance holes 221 and the electrode holes 211.

[0055] Optionally, the battery cell assembly 30 can be a wound battery cell or a laminated battery cell, which is not specifically limited here. The battery cell assembly 30 includes a positive electrode tab and a negative electrode tab, which are electrically connected to the positive electrode column 25 and the negative electrode column 26 respectively through an adapter 50.

[0056] like Figure 2 As shown, the cover plate 21 is further provided with an injection hole 212 and a second avoidance hole 222. The second avoidance hole 222 is arranged opposite to the injection hole 212. The injection hole 212 is used to inject electrolyte into the battery cell, and the second avoidance hole is used to avoid the injection of electrolyte.

[0057] like Figure 2 As shown, the top cover assembly 20 also includes an explosion-proof assembly 27, which is mounted on the cover plate 21. When the air pressure inside the battery cell reaches a preset value, the explosion-proof assembly 27 ruptures, allowing the pressure to be released from the battery cell in a targeted manner. This prevents excessive air pressure inside the housing from ultimately causing the battery cell to explode, thereby improving the safety of the battery cell. Specifically, the cover plate 21 is provided with an explosion-proof hole 213. The explosion-proof assembly 27 includes an explosion-proof disc 271, which is mounted at and seals the explosion-proof hole 213, thereby ensuring the sealing of the battery cell. Optionally, the explosion-proof disc 271 is connected to the cover plate 21 by welding. The explosion-proof disc 271 is provided with a weak area. When the air pressure inside the battery cell rises to a preset value, this weak area ruptures preferentially, preventing the explosion-proof disc 271 from completely falling off the cover plate 21, thereby improving the safety of the battery cell. In some embodiments, the weak area is a notch. In this embodiment, the specific shape of the notch can be a runway, a circle, a square, etc., which is not specifically limited here. In some embodiments, the weak area can be directly processed by mechanical processing, chemical etching or other processes to locally thin the explosion-proof plate 271. In this embodiment, the shape of the weak area can be flexibly set as needed. Figure 2 As shown, the explosion-proof component 27 also includes a protective film 272, which is installed at the explosion-proof hole 213 and is located on the outside of the explosion-proof plate 271. The protective film 272 helps to protect the explosion-proof plate 271. It can not only prevent the explosion-proof plate 271 from rupturing and failing due to external pressure from the battery, but also prevent external foreign matter from being deposited in the weak area of ​​the explosion-proof plate 271, causing the explosion-proof plate 271 to fail.

[0058] like Figure 2 As shown, a third escape hole 223 is provided on the lower plastic 22. This third escape hole 223 is positioned opposite the explosion-proof hole 213 and serves to provide a safe passage for the explosion-proof assembly 27, thereby ensuring timely pressure relief when the pressure within the battery cell reaches a preset value. In this embodiment, the explosion-proof assembly 27 is positioned between the positive electrode 25 and the negative electrode 26.

[0059] In the prior art, in order to prevent battery explosion and fire, the main measure is to add flame retardants to the electrolyte. The flame retardant effect of this method increases with the increase of the flame retardant dosage. However, when the amount of flame retardant added increases, it will seriously affect the electrochemical performance of the battery itself. The addition of flame retardants to the electrolyte is carried out at the expense of the electrochemical performance of the battery.

[0060] In this regard, Figure 3 and Figure 4As shown, the battery cell of this embodiment also includes a flame retardant component 40, which is connected to the lower plastic 22. The flame retardant component 40 includes a sealed shell 41 and an electrolyte curing agent 42. The sealed shell 41 and the lower plastic 22 enclose a sealed cavity. The electrolyte curing agent 42 is disposed in the sealed cavity. The sealed cavity can be opened when the temperature inside the battery cell is greater than or equal to a preset temperature, so that the electrolyte curing agent contacts the electrolyte and undergoes a curing reaction. Specifically, when the battery cell is operating normally, the electrolyte curing agent 42 is sealed in the sealed shell 41 and does not contact the electrolyte, thereby not affecting the electrochemical properties of the electrolyte. When the battery cell experiences thermal runaway and the temperature exceeds or equals the preset temperature, the sealed cavity formed by the flame retardant component 40 opens, and the electrolyte curing agent 42 in the sealed cavity enters the receiving cavity. The electrolyte curing agent 42 reacts with the electrolyte to solidify the electrolyte, thereby stopping the battery cell from operating, avoiding the problem of explosion or fire caused by the continuous increase in the temperature of the battery cell, and thus providing an effective and reliable flame retardant effect on the battery cell.

[0061] In some embodiments, the electrolyte curing agent 42 includes one or more of bismaleimide (BMI) monomers, maleimide compounds, and diacrylate compounds.

[0062] In some embodiments, the mass of the electrolyte curing agent 42 is m1, the mass of the electrolyte in the battery cell is m2, and m1 / m2 = 1%-20%. The applicant has found that when the mass ratio of the electrolyte curing agent 42 to the electrolyte is 1%-20%, the battery can be quickly shut off without causing waste, and the sealed case 41 is prevented from being too large and occupying internal battery space, thereby facilitating an increase in the energy density of the battery cell.

[0063] In some embodiments, such as Figure 2-Figure 4 As shown, the flame retardant component 40 is arranged close to the pole. When the battery experiences thermal runaway, the pole will heat up rapidly, so the temperature rise rate at the pole is faster. Placing the flame retardant component 40 close to the pole is conducive to the rapid opening of the sealed cavity and the rapid outflow of the electrolyte curing agent 42, thereby promptly curing the electrolyte and improving the safety of the battery cell. In this embodiment, the battery cell includes two flame retardant components 40, one of which is arranged between the explosion-proof component 27 and the positive pole 25, and the other flame retardant component 40 is arranged between the explosion-proof component 27 and the negative pole 26. Such an arrangement can also prevent the flame retardant component 40 from interfering with other structures on the positive pole 25, the negative pole 26, and the explosion-proof component 27. Of course, in other embodiments, the number of flame retardant components 40 can also be one, three, or more, and the specific arrangement of each flame retardant component 40 on the lower plastic 22 can be flexibly arranged according to needs and is not specifically limited here.

[0064] In some embodiments, the sealing shell 41 is made of insulating plastic, such as PPS. This prevents the sealing shell 41 from contacting the cell assembly 30 and causing a short circuit, thereby improving the safety of the battery cell. Furthermore, plastic is lighter than metal, making it more conducive to lightweighting the battery cell.

[0065] In some embodiments, the wall thickness of the sealed shell 41 is 0.1 cm to 3 cm. If the wall thickness of the sealed shell 41 is too thin, it is easy to be damaged when the battery cell is hit, causing the electrolyte curing agent 42 to leak out, resulting in battery elevator failure. If the wall thickness of the sealed shell 41 is too thick, it is not conducive to the rapid outflow of the electrolyte curing agent 42, and it is likely to occupy a large amount of space, which is not conducive to improving the energy density of the battery cell.

[0066] In order to ensure that the sealed chamber can be opened when the temperature is greater than or equal to the preset temperature, Figure 3 and Figure 4 As shown, a through hole 411 is formed on the side wall of the sealed cavity facing the receiving cavity. The flame retardant assembly 40 also includes a sealant 43, which is filled in the through hole 411. This ensures the sealing of the sealed cavity when the battery cell is operating normally, prevents the electrolyte curing agent 42 from contacting the electrolyte, and ensures the chemical properties of the battery cell. The sealant 43 melts when the temperature inside the battery cell is greater than or equal to a preset temperature, thereby opening the sealed cavity and allowing the electrolyte curing agent 42 to enter the receiving cavity and react with the electrolyte.

[0067] Optionally, in this embodiment, the preset temperature is 100°C. This means that sealant 43 softens when the temperature inside the battery cell reaches 100°C or higher, disrupting the seal of the sealed cavity and allowing electrolyte to flow out of the sealed cavity. Alternatively, sealant 43 may be made of polyethylene or polyvinyl chloride. Of course, in other embodiments, the preset temperature can be flexibly set based on demand, simply by selecting sealant 43 with a melting point corresponding to the preset temperature.

[0068] In some embodiments, the through hole 411 is provided on the side wall of the sealed cavity opposite the battery cell assembly 30. This allows the electrolyte curing agent 42 to directly reach the battery cell assembly 30 after the sealant 43 melts, thereby reacting with the electrolyte as quickly as possible. Of course, in some embodiments, the through hole 411 may also be provided on other side walls of the sealed cavity, which is not specifically limited here.

[0069] In some embodiments, the sidewalls of the sealed cavity are provided with a plurality of through-holes 411. Therefore, when the internal temperature of the battery cell is greater than or equal to a predetermined temperature, the electrolyte curing agent 42 can enter the accommodating cavity through the plurality of through-holes 411, thereby more quickly reacting with the electrolyte. Optionally, the plurality of through-holes 411 are distributed as comprehensively as possible on the sidewalls of the sealed cavity.

[0070] In this embodiment, Figure 3 and Figure 4 As shown, the sealed shell 41 is positioned on the side of the lower plastic 22 facing the cell assembly 30. The sealed shell 41 has an opening, and the side of the sealed shell 41 with the opening abuts against the lower plastic 22. In other words, the sealed shell 41 and the lower plastic 22 together enclose a sealed cavity, thereby reducing the weight and volume of the sealed shell 41, thereby facilitating an increase in the energy density of the battery cell. When assembling the battery cell, the electrolyte curing agent 42 can be first loaded into the sealed shell 41 through the opening, and then the sealed shell 41 can be secured to the lower plastic 22.

[0071] Optionally, the sealing shell 41 can be connected to the lower plastic 22 by bonding. In this embodiment, a plurality of through holes 411 are provided on the side walls of the sealing shell 41 opposite to the lower plastic 22. In other embodiments, through holes 411 can be provided on each side wall of the sealing shell 41.

[0072] This embodiment also provides a battery module, which includes one, two, or more of the above-mentioned battery cells. By using the above-mentioned battery cells, the battery module has good battery performance and is effectively flame retardant.

[0073] This embodiment also provides an electrical device, comprising the aforementioned battery module. By employing the aforementioned battery module, the electrical device achieves excellent battery performance and high safety. Alternatively, the electrical device may be a vehicle, power tool, or the like, without specific limitation herein.

[0074] Example 2

[0075] This embodiment provides a battery cell having the same general structure as the battery cell in the first embodiment, except that the sealed cavity is formed by the sealing shell 41, the lower plastic 22, and the cover plate 21, as follows:

[0076] like Figure 5 and Figure 6 As shown, the sealing shell 41 is annular and is disposed between the lower plastic 22 and the cover plate 21. The sealing shell 41, the lower plastic 22, and the cover plate 21 together form a sealed cavity. This arrangement can further reduce the weight and volume of the sealing shell 41, thereby further improving the energy density of the battery cell.

[0077] In this embodiment, the through hole 411 is formed in the lower plastic 22, so that when the sealant 43 in the through hole 411 melts, the electrolyte curing agent 42 can flow directly to the battery cell assembly 30, thereby quickly contacting the electrolyte and undergoing a curing reaction. Optionally, multiple through holes 411 are formed in the lower plastic 22.

[0078] In some embodiments, the sealing shell 41 is made of plastic and is integrally formed with the lower plastic 22. Specifically, the sealing shell 41 is constructed as a rib extending upward from the upper surface of the lower plastic 22. When assembling the battery cell, the sealant 43 is first placed in the through-hole 411, the electrolyte curing agent 42 is then introduced into the sealing shell 41, and finally, the lower plastic 22 is connected to the cover plate 21. To ensure the sealing of the sealed cavity, the sealing shell 41 and the cover plate 21 are bonded together.

[0079] In some embodiments, the sealing shell 41 is made of metal material. To ensure the sealing of the sealing cavity, the sealing shell 41 is welded to the cover plate 21 and bonded to the lower plastic 22 .

[0080] In addition, the structure of the pole in this embodiment is slightly different from that in the first embodiment. Specifically, Figure 5 As shown, one end of the positive electrode post 25 (or negative electrode post 26) is disposed in the accommodating cavity and electrically connected to the battery cell assembly 30, while the other end passes through the lower plastic 22, the cover plate 21, and the upper plastic 23 in sequence and is connected to the pressing block 24. The pressing block 24 is riveted to the positive electrode post 25 (or negative electrode post 26), thereby securing the positive electrode post 25 (or negative electrode post 26).

[0081] Example 3

[0082] This embodiment provides a battery cell having the same general structure as the battery cell in the first embodiment, except that a sealed cavity is formed by a sealing shell 41. In this embodiment, the sealing shell 41 is connected to the side of the lower plastic 22 facing the battery cell assembly 30. This arrangement reduces the difficulty of manufacturing the battery cell components and increases the flexibility of the battery cell assembly process. Optionally, in this embodiment, the sealing shell 41 can be connected to the lower plastic 22 by bonding, clamping, fastening, or other methods, which are not specifically limited here.

[0083] Example 4

[0084] This embodiment provides a battery cell, the sealing shell 41 of which can be arranged in any of the positions of the first, second, or third embodiments. The main difference lies in the different ways of opening the sealing cavity, as follows:

[0085] The sealed shell 41 melts when the temperature inside the battery cell is greater than or equal to a preset temperature. Specifically, when the internal temperature of the battery cell is greater than or equal to the preset temperature, the sealed shell 41 completely melts, thereby allowing the electrolyte curing agent 42 to more quickly contact the electrolyte and initiate a curing reaction. Alternatively, the sealed shell 41 can be made of materials such as polyethylene and polyvinyl chloride. In this embodiment, the sealed shell 41 is preferably positioned on the side of the lower plastic 22 facing the battery cell assembly 30.

[0086] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art will, based on the concept of the present invention, vary the specific implementation methods and scope of application, and the contents of this specification should not be construed as limiting the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A battery cell, characterized in that include: A housing (10) and a top cover assembly (20), wherein the housing (10) and the top cover assembly (20) are arranged to form a receiving cavity, the top cover assembly (20) comprises a cover plate (21) and a lower plastic (22), the cover plate (21) is connected to the housing (10), and the lower plastic (22) is arranged on a side of the cover plate (21) facing the receiving cavity; A battery core assembly (30) is arranged in the accommodating cavity; A flame retardant component (40) is connected to the lower plastic (22). The flame retardant component (40) includes a sealing shell (41) and an electrolyte curing agent (42). The sealing shell (41), or the sealing shell (41) and the lower plastic (22), or the sealing shell (41), the lower plastic (22), and the cover plate (21) are arranged to form a sealed cavity. The electrolyte curing agent (42) is arranged in the sealed cavity. The sealed cavity can be opened when the temperature in the battery cell is greater than or equal to a preset temperature.

2. The battery cell according to claim 1, wherein A through hole (411) is provided on a side wall of the sealed cavity facing the accommodating cavity. The flame retardant assembly (40) further comprises a sealant (43). The sealant (43) is filled in the through hole (411). The sealant (43) can melt when the temperature inside the battery cell is greater than or equal to a preset temperature.

3. The battery cell according to claim 2, wherein: The through hole (411) is provided on a side wall of the sealed cavity opposite to the battery core assembly (30); and / or A plurality of through holes (411) are provided on the side wall of the sealed cavity.

4. The battery cell according to claim 1, wherein: The sealing shell (41) melts when the temperature inside the battery cell is greater than or equal to a preset temperature.

5. The battery cell according to any one of claims 1 to 4, characterized in that: The sealing shell (41) is arranged on a side of the lower plastic (22) facing the battery core assembly (30), and an opening is provided on the sealing shell (41). The side of the sealing shell (41) provided with the opening abuts against the lower plastic (22), and the sealing shell (41) and the lower plastic (22) are enclosed to form a sealed cavity.

6. The battery cell according to any one of claims 1 to 4, characterized in that: The sealing shell (41) is constructed in an annular shape and is arranged between the lower plastic (22) and the cover plate (21). The sealing shell (41), the lower plastic (22) and the cover plate (21) are jointly arranged to form the sealing cavity.

7. The battery cell according to any one of claims 1 to 4, characterized in that: The sealing shell (41) is arranged to enclose the sealing cavity, and the sealing shell (41) is connected to a side of the lower plastic (22) facing the battery core assembly (30).

8. The battery cell according to any one of claims 1 to 4, characterized in that: The top cover assembly (20) further includes a pole, and the flame retardant assembly (40) is arranged close to the pole.

9. A battery module, characterized in that: The battery comprises at least one battery cell according to any one of claims 1 to 8.

10. An electrical device, characterized in that: Comprising the battery module according to claim 9.

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