Battery case, single battery, and electric device

Abstract

The application relates to the technical field of power batteries, and provides a battery shell, a single battery and a power utilization device. The battery shell comprises a shell with at least one opening and a cover plate arranged at the opening; the shell is provided with two first side plate bodies and two second side plate bodies arranged oppositely, the area of the first side plate body is larger than that of the second side plate body; a plurality of liquid injection holes and a plurality of explosion-proof valves are arranged on the second side plate body and are alternately arranged along the length direction of the shell. The battery shell can not only increase the gas path in the battery baking process, shorten the gas diffusion path, effectively reduce the positive and negative electrode solvent residues, but also can accelerate the pole group infiltration speed when the battery is injected with liquid, shorten the liquid injection time, and also can make the battery exhaust timely and sufficiently during the battery pre-forming reaction, and the battery thermal-electric separation can be realized, so that the production efficiency and preparation quality of the single battery are improved.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a battery casing, a single cell, and an electrical device. Background Technology

[0002] In traditional battery structures, the electrolyte injection holes are typically located on the positive and negative electrode covers. However, for longer batteries, this structure is prone to causing problems during production processes such as battery baking, electrolyte injection, and pre-formation, affecting battery manufacturing quality. Therefore, there is an urgent need to design a new battery casing structure. Utility Model Content

[0003] In view of this, this application aims to provide a battery casing that can reduce liquid injection time and shorten gas transport path, thereby improving production efficiency and battery manufacturing quality.

[0004] To achieve the above objectives, the technical solution of this application is implemented as follows: A battery casing includes a casing with an opening at at least one end, and a cover plate disposed at the opening; The housing has two first side plates and two second side plates arranged opposite to each other, wherein the area of ​​the first side plates is larger than the area of ​​the second side plates; The second side plate is provided with multiple injection holes and multiple explosion-proof valves, and the multiple injection holes and multiple explosion-proof valves are arranged alternately along the length of the shell.

[0005] Furthermore, the distance d between adjacent injection holes and the explosion-proof valve satisfies: d≥21mm.

[0006] Furthermore, there are two explosion-proof valves located on the second side plate, with the two explosion-proof valves respectively located at 1 / 4 and 3 / 4 of the length of the housing.

[0007] Furthermore, the injection holes are three located on the second side plate, and in the length direction of the housing, the three injection holes are respectively located at 1 / 8, 1 / 2 and 7 / 8 of the side plate.

[0008] Furthermore, the length L of the housing is between 250mm and 600mm.

[0009] Furthermore, both ends of the housing have the openings; the cover plate includes a positive cover plate and a negative cover plate disposed at the two openings, and the positive cover plate and the negative cover plate are respectively provided with a positive electrode post and a negative electrode post.

[0010] Compared with related technologies, this application has the following advantages: (1) The battery casing described in this application, through the multiple injection holes and multiple explosion-proof valves provided on the second side plate of the casing, compared with the design of opening a single injection hole on the cover plate in the traditional structure, not only can it make the gas path more numerous and the diffusion path shorter during the battery baking process, effectively reducing the residue of positive and negative electrode solvents, but also during battery injection, the injection through multiple injection holes can increase the initial diffusion points of electrolyte, accelerate the injection process, and improve the wetting speed. In addition, with the injection method, the electrode assembly can be quickly wetted in the length direction. At the same time, during battery pre-formation, the multiple injection holes, in conjunction with pre-charge restraint and negative pressure suction nozzle, ensure timely and sufficient venting during the battery pre-formation reaction.

[0011] Furthermore, multiple injection holes and multiple explosion-proof valves are arranged on the housing. This arrangement allows for thermoelectric separation between the battery and the terminals on the cover. The multiple explosion-proof valves also reduce the gas path in the event of battery thermal runaway, enabling rapid cooling to stop adverse reactions.

[0012] (2) Limiting the distance between adjacent injection holes and explosion-proof valves can prevent electrolyte from overflowing and contaminating the explosion-proof valve due to improper operation during injection or production.

[0013] (3) Two explosion-proof valves are installed on the second side plate, and the two explosion-proof valves are respectively arranged at 1 / 4 and 3 / 4 of the length of the second side plate. This design is balanced and can better reduce the path of each gas path in case of thermal runaway.

[0014] (4) The three injection holes are arranged at intervals, and the positions of the three injection holes are respectively arranged at 1 / 8, 1 / 2 and 7 / 8 of the length of the side plate body, so that the injection positions are evenly distributed. This can further reduce the residue of positive and negative electrode solvents in the battery baking process, and can also further improve the wetting speed and improve the wetting effect.

[0015] (5) Limitation of shell length: Based on the length of the shell, a reasonable number of injection holes and explosion-proof valves can be arranged on the second side plate.

[0016] (6) Both ends of the casing are provided with openings, and are matched with positive and negative electrode cover plates. The structure is relatively mature and can reduce the cost of production process modification. Only the electrode post is retained on the cover plate, which can make the structure of the cover plate simpler. The electrode post, liquid injection hole and explosion-proof valve are arranged in separate areas, which can also realize the thermoelectric separation of the battery.

[0017] Another objective of this application is to provide a single-cell battery having a battery casing as described above.

[0018] The single-cell battery described in this application, by employing the aforementioned battery casing and utilizing multiple injection holes and multiple explosion-proof valves on the narrow surface of the casing, not only allows for more gas paths and shorter diffusion paths during the battery baking process, effectively reducing the residue of positive and negative electrode solvents, but also increases the initial diffusion points of the electrolyte during battery injection, accelerating the injection process and improving the wetting speed. Furthermore, in conjunction with the injection method, the electrode assembly can be rapidly wetted along its length. Moreover, during battery pre-formation, the multiple injection holes, combined with pre-charge restraint and negative pressure nozzles, ensure timely and sufficient venting during the battery pre-formation reaction, while also achieving thermoelectric separation of the battery, thereby improving the manufacturing quality of the single-cell battery.

[0019] Another object of this application is to provide an electrical device having a single battery as described above.

[0020] The electrical device described in this application, by employing the aforementioned single-cell battery, can, on the one hand, increase the gas path in the battery baking process, shorten the gas diffusion path, and effectively reduce the residue of positive and negative electrode solvents; on the other hand, it can accelerate the electrode assembly wetting speed and shorten the injection time during battery liquid injection, and also ensure timely and sufficient venting during the battery pre-formation reaction. Furthermore, it can achieve thermoelectric separation of the battery, which is beneficial to improving the preparation quality of the single-cell battery, thereby improving the quality and reliability of the electrical device. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a structural schematic diagram of the battery casing in the application state as described in the embodiments of this application; Figure 2 This application describes various liquid injection modes for single-cell batteries as described in its embodiments. Explanation of reference numerals in the attached figures: 1. Shell; 101. First side plate; 102. Second side plate; 10. Injection hole; 20. Explosion-proof valve; 30. Suction nozzle; 2. Positive electrode cover plate; 201. Positive electrode post; 3. Negative electrode cover plate; 301. Negative electrode post. Detailed Implementation

[0022] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0024] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.

[0026] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0027] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0028] An embodiment of the first aspect of this application provides a battery casing that can reduce liquid injection time and shorten gas transport path, thereby improving production efficiency and battery manufacturing quality.

[0029] In related technologies, traditional battery structures typically place the electrolyte injection holes on the positive and negative electrode covers. However, for longer batteries, this structural design is prone to causing numerous problems during production processes such as battery baking, electrolyte injection, and pre-formation, thus affecting the quality of battery manufacturing.

[0030] For example, during the cell baking process, the solvent used to make the positive electrode slurry is mostly N-methylpyrrolidone (NMP), and the solvent used to make the negative electrode slurry is mostly deionized water. Trace amounts of solvent residue in either the positive or negative electrode will severely negatively impact the cell's performance. In production, prolonged baking is typically used to reduce the solvent levels to extremely low levels to eliminate this effect. However, as cell sizes increase, such as in longer blade batteries, where the only opening, the electrolyte injection port, is located on the shorter side of a cuboid, it inevitably leads to difficulty in diffusing residual solvent from the more distant end of the cell to the outside during baking. This can easily result in large discrepancies in the distribution of residual solvent and require even longer baking times.

[0031] For example, in the battery electrolyte filling process, a restraint-type electrolyte filling method is usually adopted, that is, the four sides of the battery are protected by a clamp, and the large and side surfaces of the battery are restrained in the clamp to prevent the battery from bulging during pressure cycling. The electrolyte filling process is basically the same as high pressure isobaric, and the electrolyte filling is completed by repeatedly cycling positive and negative pressure and letting it stand.

[0032] When using a single injection hole for unidirectional pressurized injection, the pressure must be less than the pressure that the explosion-proof valve on the cover can withstand; otherwise, the explosion-proof valve may burst or leak. Therefore, constraint-type injection can only be completed through multiple cycles at low pressure, resulting in low production efficiency. This is especially true for larger battery structures with greater dimensions and capacity, such as blade batteries. Using a single injection hole on the cover leads to longer injection times, poorer electrode wetting, and even lower production efficiency.

[0033] For example, during the battery pre-formation process, a large amount of gas is generated between the positive and negative electrodes due to the formation reaction. A common method is to apply a restraining force to the battery during pre-formation to promote gas expulsion, followed by evacuation and negative pressure at the electrolyte filling port. However, for larger batteries such as blade batteries, the distance from the center to the edge increases significantly, making it difficult for gas to diffuse to the filling port at the other end. If air bubbles exist between the positive and negative electrodes, they will hinder lithium-ion transport, potentially leading to lithium plating and an irreversible reduction in battery capacity.

[0034] In view of this, in order to overcome the shortcomings of the related technology, the battery casing in this embodiment refers to... Figure 1 As shown, the overall design includes a housing 1 with an opening at at least one end, and a cover plate disposed at the opening.

[0035] The housing 1 has two first side plates 101 and two second side plates 102 arranged opposite to each other, with the area of ​​the first side plates 101 being larger than the area of ​​the second side plates 102. The second side plates 102 are provided with a plurality of injection holes 10 and a plurality of explosion-proof valves 20, which are arranged alternately along the length of the housing 1.

[0036] At this point, as described above, the multiple injection holes 10 and multiple explosion-proof valves 20 provided on the second side plate 102 of the housing 1, compared to the traditional design of opening a single injection hole 10 on the cover plate, not only can the battery baking process have more gas paths and shorter diffusion paths, effectively reducing the residue of positive and negative electrode solvents, but also, during battery liquid injection, the injection through multiple injection holes 10 can increase the initial diffusion points of the electrolyte, accelerate the liquid injection process, and improve the wetting speed. In addition, with the liquid injection method, the electrode assembly can be quickly wetted in the length direction. At the same time, during battery pre-formation, the multiple injection holes 10, in conjunction with pre-charge restraint and negative pressure suction nozzle 30, ensure timely and sufficient venting during the battery pre-formation reaction.

[0037] Based on the above overview, for more details, please refer to... Figure 1 As shown, the battery casing includes a housing 1 and a cover plate, wherein at least one end of the housing 1 is open, the cover plate is sealed at the opening and welded to the housing 1, so that a closed space is formed inside the housing 1.

[0038] The housing 1 has two first side plates 101 and two second side plates 102 arranged opposite to each other, which are connected end to end to form a rectangular cavity structure. The area of ​​the first side plate 101 is larger than the area of ​​the second side plate 102, as shown in the figure below. Figure 1 As shown, the first side plate 101 corresponds to the large surface of the battery, and the second side plate 102 corresponds to the narrow surface of the battery. Furthermore, the second side plate 102 is provided with a plurality of liquid injection holes 10 and a plurality of explosion-proof valves 20, which are arranged alternately along the length of the housing 1.

[0039] In some exemplary embodiments, for example, the length L of the housing 1 is between 250mm and 600mm. In specific implementations, the length L of the housing 1 can be set to, for example, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, or 600mm. Here, by limiting the length of the housing 1, a reasonable number of injection holes 10 and explosion-proof valves 20 can be arranged on the second side plate 102 according to the length of the housing 1.

[0040] Based on the fact that the second side plate 102 of the housing 1 is provided with a plurality of injection holes 10 and a plurality of explosion-proof valve holes 20, in a preferred embodiment, the housing 1 of this embodiment has openings at both ends, and the cover plate includes a positive electrode cover plate 2 and a negative electrode cover plate 3 provided at the two openings, and a positive electrode post 201 and a negative electrode post 301 are respectively provided on the positive electrode cover plate 2 and the negative electrode cover plate 3.

[0041] In this embodiment, openings are provided at both ends of the casing 1, along with the positive electrode cover plate 2 and the negative electrode cover plate 3. The structure is relatively mature and can reduce the cost of modifying the production process. Furthermore, only the electrode posts are retained on the cover plates, which makes the structure of the cover plates simpler. The electrode posts and the liquid injection hole 10 and explosion-proof valve 20 on the casing 1 are arranged in separate areas, which can also achieve thermal and electrical separation of the battery.

[0042] Reference Figure 1 As shown, in some exemplary embodiments, for example, the distance d between adjacent injection holes 10 and explosion-proof valve 20 satisfies: d ≥ 21 mm. In specific implementations, this distance d can be set to, for example, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, or other values ​​greater than 21 mm.

[0043] Here, by limiting the distance between adjacent injection holes 10 and explosion-proof valve 20, electrolyte overflow and contamination of explosion-proof valve 20 due to improper operation during injection or production can be avoided.

[0044] It should be noted that for housings 1 of different lengths, the number of injection holes 10 can be set to two, three, four or more, and the number of explosion-proof valves 20 can be set to two, three, four or more. The number of injection holes 10 can be the same as the number of explosion-proof valves 20 or different from the number of explosion-proof valves 20. This embodiment does not limit this, and the specific settings can be made according to actual needs.

[0045] Continue to refer to Figure 1 As shown, in some exemplary embodiments, for example, two explosion-proof valves 20 are provided on the side plate, with the two explosion-proof valves 20 respectively located at 1 / 4 and 3 / 4 of the length of the side plate. The design of having two explosion-proof valves 20 on the side plate, and the two explosion-proof valves 20 respectively arranged at 1 / 4 and 3 / 4 of the length of the side plate, provides a balanced position and better reduces the path of each gas path in the event of thermal runaway.

[0046] Based on the above-described arrangement of the explosion-proof valve 20, we will continue to refer to... Figure 1As shown, in some exemplary embodiments, there are, for example, three injection holes 10 provided on the second side plate 102, with the three injection holes 10 respectively located at 1 / 8, 1 / 2 and 7 / 8 of the side plate in the length direction of the housing 1.

[0047] By setting three injection holes 10 at intervals, and positioning the three injection holes 10 at 1 / 8, 1 / 2 and 7 / 8 of the length of the side plate respectively, the injection positions are evenly distributed, which can further reduce the residue of positive and negative electrode solvents in the battery baking process, and also further improve the wetting speed and wetting effect.

[0048] Meanwhile, the positions of the three injection holes 10 and the two explosion-proof valves 20 are evenly arranged along the length of the casing 1. This makes the appearance of the battery casing 1 neat and the injection channels and venting paths more balanced, which can further facilitate the rapid injection of electrolyte and sufficient venting, thereby improving the production efficiency and manufacturing quality of the battery.

[0049] It is worth noting that, regarding the battery casing of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still made of... Figure 1 As shown, it may include, for example, a housing 1 with openings at both ends, and cover plates provided at each opening. The housing 1 has two first side plates 101 and two second side plates 102 arranged opposite to each other, the area of ​​the first side plates 101 being larger than the area of ​​the second side plates 102. Furthermore, the second side plates 102 are provided with a plurality of injection holes 10 and a plurality of explosion-proof valves 20, the plurality of injection holes 10 and the plurality of explosion-proof valves 20 being arranged alternately along the length direction of the housing 1.

[0050] The length L of the shell 1 is between 250mm and 600mm. The cover plate includes a positive electrode cover plate 2 and a negative electrode cover plate 3 located at the two openings. The positive electrode cover plate 2 and the negative electrode cover plate 3 are respectively provided with a positive electrode post 201 and a negative electrode post 301.

[0051] The distance d between adjacent injection holes 10 and explosion-proof valve 20 satisfies: d≥21mm.

[0052] Among them, there are two explosion-proof valves 20 on the side plate, and the two explosion-proof valves 20 are respectively located at 1 / 4 and 3 / 4 of the length of the side plate. In addition, there are three injection holes 10 on the second side plate 102, and the three injection holes 10 are respectively located at 1 / 8, 1 / 2 and 7 / 8 of the length of the side plate.

[0053] In the preferred embodiment of the battery casing described above, the specific configuration and arrangement of the casing 1, cover plate, injection hole 10, and explosion-proof valve 20 can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the casing 1, cover plate, injection hole 10, and explosion-proof valve 20 can also be referred to the descriptions in the above exemplary embodiments.

[0054] The battery casing of this embodiment adopts the above design. By setting multiple liquid injection holes 10 and explosion-proof valves 20 on the narrow surface of the casing 1, on the one hand, it can achieve thermal and electrical separation of the battery by separating it from the poles on the cover plate. On the other hand, the multiple explosion-proof valves 20 can reduce the gas path in the event of thermal runaway of the battery and can cool it down quickly.

[0055] Furthermore, the multiple injection holes 10 can create multiple gas paths during the battery baking process, resulting in shorter gas diffusion paths and effectively reducing solvent residue on the positive and negative electrodes. Moreover, during battery electrolyte injection, using multiple injection holes 10 increases the initial diffusion points of the electrolyte, accelerates the injection process, improves wetting speed, and, combined with the injection method, allows for rapid wetting of the electrode assembly along its length. Simultaneously, during battery pre-formation, the multiple injection holes 10, in conjunction with pre-charge restraint and the negative pressure nozzle 30, ensure timely and sufficient venting during the battery pre-formation reaction, thereby effectively reducing the probability of lithium plating and interface blistering, improving battery yield and overall consistency.

[0056] In this embodiment, during the electrolyte filling process, the electrolyte filling hole 10 is aligned with the suction nozzle 30 on the electrolyte filling device and pressed together to seal. Then, operations such as battery leak testing, electrolyte filling, and residual electrolyte blowing are performed. A single battery cell using the battery casing of this embodiment can be filled using various methods, as detailed below. Figure 2 As shown, for example, synchronous liquid injection circulation, that is, multiple liquid injection holes 10 simultaneously perform high-pressure liquid injection and negative pressure circulation, which can achieve rapid liquid injection and rapid longitudinal wetting of the electrode group.

[0057] Another example is asynchronous injection circulation, where some injection holes 10 are injected under high pressure while the remaining injection holes 10 are subjected to negative pressure. Then, the injection holes 10 undergoing high-pressure injection switch to negative pressure, and the remaining injection holes 10 undergoing negative pressure switch back to high-pressure injection. This injection method, through asynchronous switching between multiple injection holes 10, enables rapid injection of electrolyte and rapid wetting along the length direction.

[0058] For example, some of the injection holes 10 are subjected to positive pressure, while the remaining injection holes 10 are maintained at normal pressure or negative pressure, so that the residual electrolyte in the injection buffer cup can be forced into the battery.

[0059] It is worth noting that the above three injection methods can be combined and mixed to achieve the best balance between injection efficiency, electrode wetting degree, and injection fluid loss.

[0060] An embodiment of the second aspect of this application provides a single-cell battery having a battery casing as described above.

[0061] In this embodiment, the single-cell battery, by employing the aforementioned battery casing 1 and utilizing multiple injection holes 10 and multiple explosion-proof valves 20 disposed on the narrow surface of the casing 1, not only can the battery baking process be improved by having multiple gas paths and short diffusion paths, effectively reducing the residue of positive and negative electrode solvents, but also during battery injection, the initial diffusion points of the electrolyte can be increased, accelerating the injection process and improving the wetting speed. Furthermore, in conjunction with the injection method, the electrode assembly can be rapidly wetted along its length. Moreover, during battery pre-formation, the multiple injection holes 10, in conjunction with pre-charge restraint and negative pressure suction nozzles 30, ensure timely and sufficient venting during the battery pre-formation reaction, while also achieving thermoelectric separation of the battery, thereby improving the manufacturing quality of the single-cell battery.

[0062] An embodiment of the third aspect of this application provides an electrical device that includes a single battery as described above.

[0063] In this embodiment, the electrical device can be a vehicle, portable device, ship, spacecraft, or electric toy, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Portable devices can be, for example, unmanned logistics vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. This embodiment does not impose any special limitations on the above-mentioned electrical devices.

[0064] The electrical device of this embodiment, by employing the aforementioned single-cell battery, can, on the one hand, increase the gas path in the battery baking process, shorten the gas diffusion path, and effectively reduce the residue of positive and negative electrode solvents; on the other hand, it can accelerate the electrode assembly wetting speed and shorten the injection time during battery liquid injection; it can also ensure timely and sufficient venting during the battery pre-formation reaction; and it can also achieve thermoelectric separation of the battery, which is beneficial to improving the preparation quality of the single-cell battery, thereby improving the quality and reliability of the electrical device.

[0065] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the protection scope of the claims of this application.

Claims

1. A battery casing, characterized in that: It includes a housing with an opening at at least one end, and a cover plate disposed at the opening; The housing has two first side plates and two second side plates arranged opposite to each other, wherein the area of ​​the first side plates is larger than the area of ​​the second side plates; The second side plate is provided with multiple injection holes and multiple explosion-proof valves, and the multiple injection holes and multiple explosion-proof valves are arranged alternately along the length of the shell.

2. The battery casing according to claim 1, characterized in that: The distance d between adjacent injection holes and the explosion-proof valve satisfies: d≥21mm.

3. The battery casing according to claim 1, characterized in that: The explosion-proof valves are two valves located on the second side plate. In the length direction of the housing, the two explosion-proof valves are respectively located at 1 / 4 and 3 / 4 of the second side plate.

4. The battery casing according to claim 1, characterized in that: The injection holes are three located on the second side plate. Along the length of the housing, the three injection holes are respectively located at 1 / 8, 1 / 2, and 7 / 8 of the side plate.

5. The battery casing according to claim 1, characterized in that: The length L of the housing is between 250mm and 600mm.

6. The battery casing according to any one of claims 1 to 5, characterized in that: The shell has the opening at both ends; The cover plate includes a positive electrode cover plate and a negative electrode cover plate disposed at the two openings, and a positive electrode post and a negative electrode post are respectively disposed on the positive electrode cover plate and the negative electrode cover plate.

7. A single-cell battery, characterized in that: The single cell is provided with a battery casing as described in any one of claims 1 to 6.

8. An electrical device, characterized in that: The electrical device is equipped with the single battery as described in claim 7.

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