A single cell and a battery device

Abstract

The application discloses a single battery and a battery device, comprising a shell assembly and a battery core, the shell assembly comprises a shell and a cover plate; one end face of the shell assembly is provided with a pressure relief valve, an insulating plate is arranged between the battery core and the pressure relief valve, and an extension is arranged on the side of the insulating plate facing the battery core and / or the notch; in a first direction, the minimum distance from the extension to the notch is dmm, in a second direction, the maximum height of the extension is hmm, and the range of dmm×hmm is 0.5-600 mm 2 . The application controls the relationship between the distance from the extension to the notch and the height of the extension, guarantees the exhaust passage between the battery core and the pressure relief valve, prevents the battery core from blocking the pressure relief valve, avoids the problem that the battery core is affected by the gravity drop caused by the melting of the insulating plate to affect the exhaust space, and guarantees that the single battery is timely relieved and the exhaust passage is smooth when thermal runaway occurs.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a single cell battery and a battery device. Background Technology

[0002] With the increasing popularity of new energy batteries, people have higher and higher demands for the energy density and fast charging performance of battery devices, which poses a certain challenge to the safety performance of battery devices. When a battery experiences thermal runaway, the cell may block the pressure relief valve outlet, preventing the timely discharge of high-temperature gases inside the battery, thereby exacerbating the thermal runaway reaction inside the battery.

[0003] Therefore, how to promptly depressurize the gas inside a single cell during thermal runaway is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a single cell battery so as to ensure that the internal gas can be depressurized in a timely manner when the single cell battery is in thermal runaway.

[0005] Another object of this application is to provide a battery device having the above-mentioned single cell.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] The first aspect of this application provides a single-cell battery, including a housing assembly, the housing assembly including a housing and a cover plate, a receiving space being formed between the housing and the cover plate, an opening being provided at at least one end of the housing, and the cover plate being disposed at the opening of the housing and sealing the opening;

[0008] A pressure relief valve is provided on one end face of the housing assembly, and the pressure relief valve is provided with grooves;

[0009] It also includes a battery cell, which is disposed within the receiving space. An insulating plate is disposed between the battery cell and the pressure relief valve. The insulating plate has a through portion, which is disposed corresponding to the pressure relief valve. An extension portion is disposed on the side facing the battery cell and / or the groove. The extension portion and the through portion are arranged along a first direction. Along the first direction, the minimum distance from the extension portion to the groove is dmm, and along a second direction, the maximum height of the extension portion is hmm. Therefore, the range of dmm × hmm is 0.5~600, with the unit being mm. 2 ;

[0010] The second direction is perpendicular to the insulating plate, and the first direction is parallel to the large surface of the shell and perpendicular to the second direction.

[0011] The single-cell battery provided by the above technical solution selects dmm×hmm within the range of 0.5~600. This avoids the problem of excessively small dmm×hmm values ​​(i.e., too small a distance from the extension to the notch and too small a height of the extension), which causes the extension to soften rapidly, affecting the conduction of the venting channel and leading to poor venting; it also avoids the problem of excessively large dmm×hmm values ​​(i.e., too large a distance from the extension to the notch and too large a height of the extension), which causes the extension to occupy a large space inside the battery, resulting in low energy density of the single-cell battery. The single-cell battery provided in this application, by controlling the relationship between the distance from the extension to the notch and the height of the extension, ensures the venting channel between the cell and the pressure relief valve, preventing the cell from blocking the pressure relief valve. At the same time, it avoids the problem of the cell falling due to gravity and affecting the venting space caused by the melting of the insulating plate. This ensures timely pressure relief and smooth venting channel in the event of thermal runaway, preventing the pressure relief port from bursting and affecting the safety of adjacent single-cell batteries.

[0012] A second aspect of this application provides a battery device comprising at least two of the aforementioned individual battery cells.

[0013] The battery device provided in this application has the aforementioned single cell, and therefore also has the aforementioned single cell, which will not be described again in this application. Attached Figure Description

[0014] 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 based on these drawings without creative effort.

[0015] Figure 1 This is an exploded view of the battery cell and insulating board disclosed in the embodiments of this application;

[0016] Figure 2 This is a structural schematic diagram of the insulating plate disclosed in the embodiments of this application from a lower side view;

[0017] Figure 3 This is a front view of the insulating plate disclosed in the embodiments of this application;

[0018] Figure 4 This is a front view of an insulating plate disclosed in another embodiment of this application;

[0019] Figure 5 This is a diagram showing the positional relationship between the battery cell, pressure relief valve, and insulating plate disclosed in the embodiments of this application;

[0020] Figure 6 This is a schematic diagram of the structure of the insulating film disclosed in the embodiments of this application;

[0021] Figure 7 This is a schematic diagram of the end face of a battery cell with a pressure relief valve as disclosed in the embodiments of this application;

[0022] Figure 8 for Figure 7 Sectional view along line AA;

[0023] Figure 9 for Figure 8 A magnified view of part A in the image.

[0024] The meanings of the various reference numerals in the figure are as follows:

[0025] 100 - Housing assembly; 110 - Housing; 120 - Cover plate;

[0026] 200 - Pressure relief valve; 201 - Pressure relief zone; 202 - Score;

[0027] 300-cell;

[0028] 400 - Insulating plate; 410 - Extension; 411 - First extension; 412 - Second extension; 4121 - Through hole; 413 - Second through hole; 420 - Through part;

[0029] 500 - Insulating film; 501 - First through hole. Detailed Implementation

[0030] This application discloses a single-cell battery to ensure that the internal gas can be depressurized in a timely manner when the single-cell battery experiences thermal runaway.

[0031] This application also discloses a battery device having the above-described single cell.

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] The casing of each individual battery is equipped with a pressure relief valve. When a large amount of gas is generated inside the battery due to abnormal conditions such as overcharging, overheating, or short circuits, causing the internal pressure to rise to a certain level, the pressure generated by the gas will cause the pressure relief valve to open. At this time, the high-pressure gas inside the battery can be discharged, thereby reducing the internal pressure of the battery and preventing serious safety accidents such as explosion or rupture due to excessive internal pressure.

[0034] When a single cell experiences thermal runaway, the high pressure inside the cell breaks through the pressure relief valve, releasing pressure and preventing the single cell from exploding.

[0035] Research has revealed that the main cause of rapid thermal runaway in a single battery cell is poor venting. After thermal runaway, the high-temperature gas generated inside the cell causes the insulating plate located between the pressure relief valve and the cell to melt rapidly. In existing technologies, a protrusion is usually provided at the location corresponding to the pressure relief valve to create a gas storage space between the cell and the valve, ensuring smooth pressure relief. However, the protrusion is usually made of insulating material with poor temperature resistance. After melting at high temperatures, the distance between the cell and the casing is short. Especially when the pressure relief valve is located at the bottom of the cell, the cell is subjected to gravity. After the insulating plate melts, the cell blocks the pressure relief valve, preventing the internal gas from being discharged through the valve and causing severe thermal runaway inside the battery.

[0036] Based on this, this application discloses a single-cell battery so that the gas inside the battery can be depressurized in a timely manner when the single-cell battery experiences thermal runaway.

[0037] like Figures 7-9 As shown, the single battery disclosed in this application includes a housing assembly 100, which includes a housing 110 and a cover plate 120. A receiving space is formed between the housing 110 and the cover plate 120. At least one end of the housing 110 is provided with an opening, and the cover plate 120 is disposed at the opening of the housing 110 and blocks the opening.

[0038] The single battery also includes a cell 300, which is disposed within the accommodating space. The casing 110 serves as the external protective structure for the cell 300, isolating it from the external environment. The casing 110 is primarily made of metals such as aluminum, iron, or steel. Typically, one end of the casing 110 is open, facilitating the installation of the cell 300 inside the casing 110 through this opening. A cover plate 120 is disposed over the opening of the casing 110; that is, the cover plate 120 is a component that covers the opening of the casing 110 to isolate the accommodating space of the cell 300 from the external environment. The shape of the cover plate 120 can be adapted to the shape of the casing 110. The cover plate 120 can be made of a material with a certain degree of hardness and strength (such as aluminum alloy).

[0039] The housing assembly 100 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. The shape of the housing assembly 100 can be determined according to the specific shape and size of the battery cell 300. The housing assembly 100 can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0040] The battery cell 300 generally includes a battery cell body and a tab extending from at least one end of the battery cell body. The battery cell body includes an electrode, and the electrode includes a current collector and an active material layer coated on at least one surface thereon.

[0041] The electrodes of a battery cell generally include a positive electrode and a negative electrode, with a separator between them. The battery cell is formed by winding or stacking the positive electrode, negative electrode, and separator. The positive electrode includes a positive current collector and a positive active material. The positive current collector can be made of metals such as aluminum foil, nickel foil, or stainless steel, or a composite foil formed by combining metals and insulating materials. The positive active material includes the main positive active material, conductive agent, and binder. The main positive active material includes one or more lithium-containing positive active materials such as lithium iron phosphate, ternary materials containing nickel, cobalt, and manganese, and lithium manganese iron phosphate.

[0042] Similarly, the negative electrode sheet includes a negative electrode current collector and a negative electrode active material. The negative electrode current collector can be made of metal materials such as copper foil, aluminum foil, and stainless steel, or it can be a composite foil material formed by combining metals and insulating materials. The negative electrode active material includes the negative electrode active material, conductive agent, binder, etc. The negative electrode active material includes one or more of the following: artificial graphite, natural graphite, silicon carbide, silicon oxide, lithium titanate, etc.

[0043] The separator is an insulating membrane placed between the positive and negative electrode plates to prevent electrons from passing through while allowing ions to pass through. The separator is made of at least one of the following materials: glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, etc.

[0044] like Figure 5 As shown, a pressure relief valve 200 is provided on one end face of the housing assembly 100, and the pressure relief valve 200 has a groove 202. The groove 202 is a recess provided on the plate of the pressure relief valve 200, so that when the pressure relief area 201 enclosed by the groove 202 reaches the pressure relief pressure inside the housing assembly 100, the groove 202 breaks, allowing the pressure relief area 201 to open and relieve pressure. When a large amount of gas is generated inside a single battery due to abnormal conditions such as overcharging, overheating, or short circuit, causing the internal pressure to rise to a certain level, the pressure generated by the gas will cause the groove 202 to break, causing the groove 202 to fall off or bend on the housing assembly 100, thus forming a pressure relief port on the housing assembly 100 to relieve the pressure inside the housing assembly 100. The notch 202 can be set on the side of the pressure relief valve 200 facing the battery cell 300, or on the side of the pressure relief valve 200 away from the battery cell 300. Of course, the notch 202 can also be set on both the side of the pressure relief valve 200 facing the battery cell 300 and the side away from the battery cell 300.

[0045] like Figure 1 and Figure 5As shown, an insulating plate 400 is provided between the battery cell 300 and the pressure relief valve 200. The insulating plate 400 has a through-hole 420, which corresponds to the pressure relief valve. The insulating plate 400 effectively blocks the conductive path between the battery cell 300 and the corresponding end face of the housing assembly 100, preventing such a dangerous situation from occurring. The insulating plate 400 also typically acts as a buffer, reducing the direct impact on the battery cell when subjected to external shocks or vibrations. When a single battery cell is impacted, the insulating plate 400 can absorb some of the impact force, reducing the risk of damage to the battery cell 300 due to vibration and impact, and extending the service life of the battery cell 300.

[0046] An extension 410 is provided on the side of the insulating plate 400 facing the battery cell 300 and / or the notch 202, and the extension 410 and the through portion 420 are arranged along a first direction. That is, the extension 410 may only be provided on the side of the insulating plate 400 facing the battery cell 300 (e.g., Figures 1-3 (As shown), it can also be set only on the side of the insulating plate 400 facing the notch 202, or it can be set on both the side of the insulating plate 400 facing the cell 300 and the side facing the notch 202 (as shown). Figure 4 (as shown); in other words, the extension 410 protrudes from at least one surface of the insulating plate 400 in a direction perpendicular to the insulating plate 400.

[0047] The extension 410 and the insulating plate 400 can be integrally formed or connected separately. The insulating plate 400 can be made of one or more of the following materials: PP (Polypropylene), PET (Polyethylene terephthalate), PPS (Polyphenylene sulfide), PI (Polyimide), stainless steel, aluminum alloy, nickel-based alloy, titanium alloy, etc. The extension 410 can be made of one or more of the following materials: PI (Polyimide), phenolic resin, mica, stainless steel, aluminum alloy, nickel-based alloy, titanium alloy, etc. Understandably, if both the insulating plate 400 and the extension 410 are made of one or more of the following metal materials: stainless steel, aluminum alloy, nickel-based alloy, titanium alloy, etc., an insulating coating needs to be sprayed onto the surface of one of them.

[0048] It should be noted that during thermal runaway of a single battery cell, a large amount of high-temperature and high-pressure gas is generated. This high-temperature and high-pressure gas needs to pass through the through-hole 420 of the insulating plate 400 and be discharged through the pressure relief valve 200 on one side of the insulating plate 400. The extension 410 on the insulating plate 400 can guide the flow of these gases, causing the thermal runaway gas to collect in the through-hole 420 and discharge in a predetermined, safe direction, away from the casing 110 or other critical components that may cause a short circuit. Simultaneously, it increases the distance between the battery cell 300 and the pressure relief valve 200, forming an exhaust channel that allows the gas inside the battery to discharge smoothly. By arranging the extension 410 and the through-hole 420 side-by-side, they can be spaced apart or placed close together, preventing the high-temperature gas generated inside the battery cell from melting the extension 410. The high-temperature gas can pass through the through-hole 420 and reach the pressure relief valve 200, reducing the impact on the extension 410.

[0049] The extension 410 creates gaps between the pressure relief valve 200 and the battery cell 300, which serve as channels for the rapid discharge of thermal runaway gases. Compared to a flat insulating plate 400, the design with the extension 410 increases the space and smoothness of gas flow, allowing thermal runaway gases to escape from the battery more quickly. Faster venting helps reduce excessive pressure inside the battery caused by the accumulation of thermal runaway gases, reducing the likelihood of extreme events such as battery explosions.

[0050] Along the first direction, the minimum distance from the extension 410 to the notch 202 is d mm. Along the second direction, the maximum height of the extension 410 is h mm. The greater the height of the extension 410, the smoother the venting; the smaller the height of the extension 410, the less space it occupies in the battery. The second direction is perpendicular to the insulating plate 400 (i.e., the surface with the largest area perpendicular to the insulating plate 400). The first direction is parallel to the large surface of the housing 110 and perpendicular to the second direction.

[0051] The single-cell battery disclosed in this application can have a dmm×hmm size of 0.5mm. 2 ~600mm 2 Select within the range, unit mm for dmm×hmm 2 For example, dmm × hmm can be 0.5mm. 2 50mm 2 100mm 2 150mm 2 200mm 2 250mm 2 300mm 2 350mm 2 400mm 2 450mm 2 500mm2 550mm 2 600mm 2 It should be noted that the above values ​​are merely specific examples, and those skilled in the art can adjust the values ​​according to their needs, such as 0.5mm. 2 ~600mm 2 Choose any specific value of dmm×hmm within the range.

[0052] The minimum distance dmm from the extension 410 to the notch 202 can range from 1mm to 200mm. For example, dmm can be 1mm, 20mm, 40mm, 60mm, 80mm, 100mm, 120mm, 140mm, 160mm, 180mm, 200mm, etc. It should be noted that the above values ​​are only specific examples, and those skilled in the art can arbitrarily choose the specific value of dmm within the range of 1mm to 200mm according to their needs.

[0053] The maximum height hmm of the extension 410 can range from 0.5mm to 3mm. For example, the maximum height of the extension 410 can be 0.5mm, 0.7mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.3mm, 2.5mm, 2.8mm, 3mm, etc. It should be noted that the above values ​​are only specific examples, and those skilled in the art can arbitrarily choose the specific value of the maximum height of the extension 410 within the range of 0.5mm to 3mm according to their needs. In this embodiment, the maximum height of the extension 410 is 0.5mm to 3mm. This setting ensures improved ventilation without significantly occupying battery space. It avoids the problem of reduced battery capacity due to excessively large extension 410 height, and also avoids the problem of poor ventilation due to excessively small extension 410 height.

[0054] This configuration avoids the problem of excessively small values ​​of dmm×hmm (i.e., too small a distance and height of the extension 410 from the notch 202), causing the extension 410 to soften rapidly and affecting the ventilation channel, leading to poor ventilation. It also avoids the problem of excessively large values ​​of d×h (i.e., too large a distance and height of the extension 410 from the notch 202), causing the extension 410 to occupy a large space inside the battery, resulting in low energy density of the single cell. The single cell provided in this application, by controlling the relationship between the distance and height of the extension 410 from the notch 202, ensures a proper ventilation channel between the cell 300 and the pressure relief valve 200, preventing the cell 300 from blocking the pressure relief valve 200. It also prevents the cell 300 from falling due to gravity and affecting the ventilation space due to the melting of the insulating plate. This ensures timely pressure relief and a smooth ventilation channel during thermal runaway, preventing the pressure relief port from bursting and affecting the safety of adjacent single cells.

[0055] In a specific embodiment of this application, the projection of the area enclosed by the notch 202 (i.e., the pressure relief area 201) onto the insulating plate 400 does not coincide with the extension 410. This arrangement can prevent the extension 410 from melting after the battery is depressurized, which would cause the cell to block the pressure relief valve 200, affect the normal venting of the battery, and cause severe thermal runaway inside the battery, thus affecting the safety of battery use.

[0056] like Figure 1 As shown, the extension 410 includes a first extension 411, which is disposed on both sides of the pressure relief valve 200 along the first direction. In this embodiment, the pressure relief valve 200 is provided with the first extension 411 on both sides along the first direction, which provides better support for the battery cell 300 and allows thermal runaway gas on either side of the pressure relief valve 200 to flow quickly to the pressure relief valve 200 and be discharged through the pressure relief valve 200.

[0057] In a specific embodiment of this application, the distance from the first extension 411 to the notch 202 is dmm (i.e., dmm is the distance from the first extension 411 to the notch 202 along the first direction). In this embodiment, dmm can be selected within the range of 1mm to 150mm. For example, dmm can be 1mm, 15mm, 30mm, 50mm, 70mm, 90mm, 110mm, 130mm, 150mm, etc. It should be noted that the above values ​​are only specific examples, and those skilled in the art can arbitrarily select the specific value of dmm within the range of 1mm to 150mm according to their needs.

[0058] This configuration avoids the problem that the first extension 411 is too close to the groove 202, which would cause the first extension 411 to block the thermal runaway gas flowing towards the groove 202; it also avoids the problem that the first extension 411 is too far away from the groove 202, which would cause the first extension 411 to have a poor support effect on the area enclosed by the groove 202.

[0059] In a specific embodiment of this application, along a first direction, a single extension 410 includes a first end and a second end, and the distance between the first end and the second end of the extension 410 is 10mm to 200mm. For example, the distance between the first end and the second end of the extension 410 can be 10mm, 15mm, 25mm, 50mm, 75mm, 100mm, 125mm, 150mm, 175mm, 200mm, etc. It should be noted that the above values ​​are only specific examples, and those skilled in the art can arbitrarily choose the specific value of the above distance within the range of 10mm to 200mm according to their needs.

[0060] The greater the distance between the first and second ends of the extension 410, the more stable the height of the exhaust channel supported by the extension 410, but it will also occupy the space between the insulating plate 400 and the cell 300. In this embodiment, the distance between the first and second ends of a single extension 410 is selected within the range of 10mm to 200mm, which can reduce the occupation of exhaust space while ensuring the stability of the exhaust channel height and ensuring the energy density of the single battery cell.

[0061] In one specific embodiment of this application, the ratio of the distance / dmm between the first end and the second end of the extension 410 along the first direction is 0.1 to 100. For example, the ratio of the distance / dmm between the first end and the second end of the extension 410 can be 0.1, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, etc. It should be noted that the above values ​​are merely specific examples, and those skilled in the art can arbitrarily choose the specific value of the ratio within the range of 0.1 to 100 according to their needs.

[0062] In this embodiment, the ratio is selected within the range of 0.1 to 100. This avoids the problem that the extension 410 occupies too much exhaust space due to an excessively large ratio, resulting in insufficient exhaust space. It also avoids the problem that the support effect is insufficient due to an excessively small ratio.

[0063] In a specific embodiment of this application, along the first direction, the minimum distances between the first extension 411 and the notch 202 respectively located on both sides of the pressure relief valve 200 are d1mm and d2mm, respectively, then |d1mm-d2mm|≤20mm. For example, |d1mm-d2mm| can be 0mm, 1mm, 2mm, 3mm, 5mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, etc. It should be noted that the above values ​​are only specific examples, and those skilled in the art can arbitrarily choose the specific value of the above difference within the range of 0mm to 20mm according to their needs.

[0064] In this embodiment, the first extensions 411 on both sides of the pressure relief valve 200 are close to the pressure relief valve 200 and have a basically symmetrical structural design, which can ensure that the exhaust effect on both sides of the pressure relief valve 200 is similar and prevent inconsistent exhaust speed from causing an explosion.

[0065] In one specific embodiment of this application, the height of the extension 410 along the second direction is 0.5mm to 3mm. For example, the height of the extension 410 can be 0.5mm, 0.7mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.3mm, 2.5mm, 2.8mm, 3mm, etc. It should be noted that the above values ​​are only specific examples, and those skilled in the art can arbitrarily choose the specific value of the height of the extension 410 within the range of 0.5mm to 3mm according to their needs.

[0066] In this embodiment, the height of the extension 410 is selected within the range of 0.5mm to 3mm, which ensures improved ventilation without significantly occupying battery space. This avoids the problem of reduced battery capacity due to an excessively large extension 410, and also avoids the problem of poor ventilation due to an excessively small extension 410.

[0067] Furthermore, along the third direction, the first extension 411 includes at least two parts, with the third direction perpendicular to the first and second directions respectively. The third direction is the width direction of the insulating plate 400, and more than two first extensions 411 can also be provided along the width direction of the insulating plate 400. When the pressure relief valve 200 has first extensions 411 on both sides (both sides in the first direction), more than two first extensions 411 can be provided on either side of the pressure relief valve 200 along the third direction to ensure better support for the battery cell in the third direction.

[0068] The distance between two adjacent first extensions 411 along the third direction ranges from 1mm to 80mm. For example, the distance between two adjacent first extensions 411 can be 1mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, etc. It should be noted that the above values ​​are only specific examples, and those skilled in the art can arbitrarily choose the specific value of the distance between two adjacent first extensions 411 within the range of 1mm to 80mm according to their needs.

[0069] In this embodiment, the distance is selected within the range of 1mm to 80mm. This avoids the problem of affecting the exhaust space between the two parts due to the distance being too small, and also avoids the problem of affecting the exhaust space between the first extension 411 and the inner wall of the housing due to the distance being too large.

[0070] In one specific embodiment of this application, the minimum distance from the first extension 411 to the edge of the insulating plate 400 along a third upward direction is 0.5mm to 40mm. For example, the minimum distance from the first extension 411 to the edge of the insulating plate 400 can be 0.5mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, etc. It should be noted that the above values ​​are only specific examples, and those skilled in the art can arbitrarily choose the specific value of the minimum distance from the first extension 411 to the edge of the insulating plate 400 within the range of 0.5mm to 40mm according to their needs.

[0071] In this embodiment, the distance is selected within the range of 0.5mm to 40mm. This avoids the problem of poor support effect on the area near the pressure relief valve 200 due to the distance being too small, and also avoids the problem of the first extension 411 blocking the area near the pressure relief valve 200 and affecting the exhaust space due to the distance being too large.

[0072] In one specific embodiment of this application, the extension 410 may further include a second extension 412, which is disposed between the first extension 411 and the edge of the insulating plate 400 along the first direction. The first extension 411 and the second extension 412 are two extensions with different specifications, and the difference between them may be that they have different structures, shapes, sizes, etc.

[0073] like Figure 3As shown, along the first direction, the distance L1mm between the second extension 412 and the first extension 411 is 1mm to 180mm. For example, L1mm can be 1mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, etc. It should be noted that the above values ​​are only specific examples, and those skilled in the art can arbitrarily choose the specific value of L1mm within the range of 1mm to 180mm according to their needs.

[0074] In this embodiment, the second extension 412 and the first extension 411 are arranged at intervals along the first direction, and the distance between them is selected in the range of 1mm to 180mm to ensure more stable support for the battery cell 300.

[0075] Furthermore, dmm > L1mm, and dmm - L1mm is 5mm to 100mm. For example, dmm - L1mm can be 5mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, etc. It should be noted that the above values ​​are only specific examples, and those skilled in the art can arbitrarily choose the specific value of dmm - L1mm within the range of 5mm to 100mm according to their needs. Those skilled in the art can select the specific dimensions of dmm and L1mm based on the size of the exhaust channel and the support effect.

[0076] Along the second direction, the height of the second extension 412 and the first extension 411 may be different, and the height of the second extension 412 may be greater than the height of the first extension 411.

[0077] Along the third direction, the width of at least a portion of the second extension 412 is greater than the maximum width of the first extension 411. That is, the second extension 412 can provide better support for the battery cell in the third direction. The second extension 412 can be a non-uniform cross-section extension. Figure 1 In the illustrated scheme, the width of the second extension 412 in the middle region along the first direction is greater than the width of both ends along the third direction.

[0078] Furthermore, along the third direction upwards, the difference between the maximum width of the second extension 412 and the maximum width of the first extension 411 is 1mm to 70mm. For example, the difference can be 1mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, etc. It should be noted that the above values ​​are merely specific examples, and those skilled in the art can arbitrarily choose any specific value of the difference within the range of 1mm to 70mm according to their needs.

[0079] In this embodiment, the difference is selected within the range of 1mm to 70mm. This can avoid the situation where the support effect at different positions is uneven due to the difference being too large, and can also avoid the situation where the support reinforcement effect of the second extension 412 is not obvious due to the difference being too small.

[0080] In one specific embodiment of this application, along a first direction, the second extension 412 includes a central support area and end support areas located at both ends of the central support area. Along a third direction, the width of the central support area is greater than the width of the end support areas, with a difference of 1mm to 50mm. For example, the difference can be 1mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, etc. It should be noted that the above values ​​are merely specific examples, and those skilled in the art can arbitrarily choose the specific value of the difference within the range of 1mm to 50mm according to their needs.

[0081] The support effect of the central support area of ​​the second extension 412 is better than that of the end support areas. This ensures the overall support effect while preventing exhaust obstruction caused by the overall widening. The outer edge of the central support area can be a curved surface structure to reduce flow resistance and lower the exhaust resistance generated by the wider central support area.

[0082] Furthermore, a through hole 4121 is provided in the central support area. In this embodiment, by opening the through hole 4121 in the relatively wide central support area, the through hole 4121 can have a large cross-sectional area while ensuring the corresponding wall thickness; it can also have a high wall thickness in the area where the through hole 4121 is opened while ensuring the corresponding cross-sectional area.

[0083] The through hole 4121 is mainly used for the flow of electrolyte between the upper and lower sides of the insulating plate 400. It should be noted that corresponding through holes for electrolyte flow can also be provided at other locations on the insulating plate 400. The through hole 4121 is located on the middle support area of ​​the second extension 412. Since the thickness here is the sum of the thicknesses of the insulating plate 400 and the second extension 412, the strength is relatively high. Opening the through hole 4121 here will not significantly affect the strength of the insulating plate 400, so the flow area of ​​the through hole 4121 can be appropriately increased.

[0084] The minimum distance between the through hole 4121 and the edge of the central support area is 0.5mm to 5mm. For example, the minimum distance between the through hole 4121 and the edge of the central support area can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc. It should be noted that the above values ​​are only specific examples, and those skilled in the art can arbitrarily choose the specific value of the minimum distance between the through hole 4121 and the edge of the central support area within the range of 0.5mm to 5mm according to their needs. It should be noted that the larger the flow area of ​​the through hole 4121, the larger the electrolyte wetting channel, and the better the electrolyte's ability to pass through the insulating plate 400. However, if the flow area of ​​the through hole 4121 is too large, the wall thickness of the through hole 4121 will be too thin, affecting the strength around the through hole 4121.

[0085] In this embodiment, the minimum distance between the through hole 4121 and the edge of the central support area is selected within the range of 0.5mm to 5mm, which can ensure the strength of the second extension 412 while ensuring that the through hole 4121 has a large flow area.

[0086] In one specific embodiment of this application, the minimum distance between the second extension 412 and the side wall of the housing 110 along the first direction is 1mm to 80mm. For example, the minimum distance between the second extension 412 and the side wall of the housing 110 can be 1mm, 10mm, 20mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, etc. It should be noted that the above values ​​are only specific examples, and those skilled in the art can arbitrarily choose the specific value of the minimum distance between the second extension 412 and the side wall of the housing 110 within the range of 1mm to 80mm according to their needs.

[0087] In this embodiment, the minimum distance between the second extension 412 and the side wall of the housing 110 is selected within the range of 1mm to 80mm. This can avoid the problem of poor end support effect of the battery cell 300 due to the excessive distance, and can also avoid the problem of difficulty in venting the end of the battery cell 300 due to the excessive distance.

[0088] like Figure 6 As shown in a specific embodiment of this application, the single battery cell further includes an insulating film 500. The insulating film 500 wraps around the end face of the cell 300 (the end face of the cell 300 refers to the end face of the cell opposite to the insulating plate 400) and at least one side surface (the side surface of the cell 300 refers to the surface perpendicular to the end face of the cell 300). The insulating film 500 is bonded to the insulating plate 400, which is disposed on one side of the insulating film 500. As a protective layer, the insulating film 500 can prevent leakage of internal battery materials and isolate the battery from contact with the external environment, protecting the single battery cell from external environmental damage, such as extreme environments like high temperature, low temperature, and humidity.

[0089] The insulating film 500 acts as a barrier to prevent moisture and dust from entering the battery cell. Moisture can affect the chemical reactions inside the battery cell 300, reducing battery performance, shortening lifespan, and in severe cases, potentially causing internal corrosion. Dust and other impurities can affect the internal structure of the battery cell and interfere with ion conduction. The insulating film 500 effectively blocks these external substances. The insulating film 500 can be a Mylar film, a polymer film based on polyester film, which has high strength, high heat resistance, and excellent mechanical properties.

[0090] Furthermore, along the first direction, at least one end of the insulating film 500 extends beyond the insulating plate 400, allowing the gas generated by the battery cell 300 to quickly pass through the portion of the insulating film 500 extending beyond the insulating plate 400. The extension distance of the insulating film 500 beyond the insulating plate 400 is 0.5mm to 5mm. For example, the aforementioned extension distance can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc. It should be noted that the above values ​​are merely specific examples, and those skilled in the art can arbitrarily select the specific value of the extension distance within the range of 0.5mm to 5mm according to their needs.

[0091] In this embodiment, the distance between the insulating film 500 and the insulating plate 400 is selected within the range of 0.5mm to 5mm. This can avoid the problem that thermal runaway gas between the housing assembly 100 and the battery cell 300 cannot quickly reach the area where the etched 202 is located due to the distance being too small. It can also avoid the problem that the insulating plate 400 is too small due to the distance being too large, resulting in poor support effect for the battery cell 300.

[0092] Furthermore, along the first direction, the end of the insulating plate 400 is chamfered to prevent the end of the insulating plate 400 from being too sharp and scratching the insulating film 500. In this embodiment, the radius of the chamfer at the end of the insulating plate 400 is 1mm to 5mm. For example, the chamfer radius at the end of the insulating plate 400 can be 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc. It should be noted that the above values ​​are only specific examples, and those skilled in the art can arbitrarily choose the specific value of the chamfer radius within the range of 1mm to 5mm according to their needs.

[0093] In a specific embodiment of this application, a first bonding area is provided between the extension 410 closest to the notch 202 and the notch 202 along the first direction. The first bonding area is used to bond the insulating plate 400 and the insulating film 500. Bonding and fixing make the insulating film 500 and the insulating plate 400 a whole, which can better resist external impacts and vibrations. When the battery cell 300 is subjected to external force, the insulating film 500 and the insulating plate 400 on the outside of the battery cell 300 are connected to each other, reducing the possibility of displacement or deformation, ensuring that the positional relationship between the battery cell 300 and the insulating plate 400 does not change, thereby preventing the extension 410 from shifting and ensuring that the positional relationship between the extension 410 and the notch 202 does not change.

[0094] Along the third direction upwards, the ratio of the width of the first bonding area to the width of the insulating board 400 is 30% to 80%. For example, the above ratio can be 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, etc. It should be noted that the above values ​​are only specific examples, and those skilled in the art can arbitrarily choose the specific value of the above ratio within the range of 30% to 80% according to their needs.

[0095] In this embodiment, the ratio is selected within the range of 30% to 80%. This avoids the problem that the strength of the insulating film 500 may be affected due to an excessively large ratio, leading to breakage of the insulating film 500 and insulation failure. It also avoids the problem that the connection strength between the insulating film 500 and the insulating plate 400 may be affected due to an excessively small ratio, leading to detachment at the connection between the insulating film 500 and the insulating plate 400.

[0096] Furthermore, along the first direction, the minimum distance between the first adhesive area and the end of the insulating plate 400 is 10mm to 100mm. For example, the minimum distance between the first adhesive area and the end of the insulating plate 400 can be 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, etc. It should be noted that the above values ​​are only specific examples, and those skilled in the art can arbitrarily choose the specific value of the minimum distance between the first adhesive area and the end of the insulating plate 400 within the range of 10mm to 100mm according to their needs.

[0097] The first bonding area may include two, and the distance between them is 20mm to 100mm. For example, the distance between the two first bonding areas can be 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, etc. It should be noted that the above values ​​are only specific examples, and those skilled in the art can arbitrarily choose the specific value of the distance between the two first bonding areas within the range of 20mm to 100mm according to their needs.

[0098] In a specific embodiment of this application, the total thickness of the insulating film 500 and the insulating plate 400 between the two first bonding areas is 0.3mm to 1.5mm. For example, the total thickness of the insulating film 500 and the insulating plate 400 between the two first bonding areas can be 0.3mm, 0.5mm, 0.7mm, 0.9mm, 1mm, 1.2mm, 1.4mm, 1.5mm, etc. It should be noted that the above values ​​are only specific examples, and those skilled in the art can arbitrarily choose the specific value of the total thickness of the insulating film 500 and the insulating plate 400 between the two first bonding areas within the range of 0.3mm to 1.5mm according to their needs. The area between the two first bonding areas is the area where the notch 202 is located. The total thickness of this area is designed to be relatively thin, making it easier to achieve pressure relief and bursting.

[0099] like Figure 1 and Figure 6As shown, the insulating film 500 has a first through hole 501, and the insulating plate 400 has a second through hole 413. The first through hole 501 and the second through hole 413 are staggered. The electrolyte can pass through the first through hole 501 and the second through hole 413, improving the charge and discharge rate and cycle life of the battery. The staggered arrangement of the first through hole 501 and the second through hole 413 can, while allowing the electrolyte to pass through, prevent the cell 300 from overlapping with the housing assembly 100 through the first through hole 501 and the second through hole 413, and also prevent the active material on the electrode from falling onto the housing assembly 100 through the first through hole 501 and the second through hole 413.

[0100] In this embodiment, the minimum distance between the first through hole 501 and the second through hole 413 is 0.5mm to 20mm. For example, the minimum distance between the two first through holes 501 and the second through hole 413 can be 0.5mm, 1mm, 3mm, 5mm, 7mm, 9mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, etc. It should be noted that the above values ​​are only specific examples, and those skilled in the art can arbitrarily choose the specific value of the minimum distance between the first through hole 501 and the second through hole 413 within the range of 0.5mm to 20mm according to their needs.

[0101] Furthermore, the area of ​​a single first through hole 501 is 10 mm². 2 ~100mm 2 For example, the area of ​​a single first through-hole 501 can be 10 mm². 2 20mm 2 30mm 2 40mm 2 50mm 2 60mm 2 70mm 2 80mm 2 90mm 2 100mm 2 It should be noted that the above values ​​are merely specific examples, and those skilled in the art can adjust the values ​​according to their needs within 10mm. 2 ~100mm 2 The specific value of the area of ​​any single first through hole 501 within the range can be selected.

[0102] In this embodiment, the area of ​​the first through hole 501 is 10mm. 2 ~100mm 2 Choosing within the specified range can avoid the problem of electrolyte flow being affected by an area that is too small, or the problem of increased insulation failure risk being caused by an area that is too large.

[0103] The insulating film 500 can be disposed between the battery cell 300 and the insulating plate 400, or between the insulating plate 400 and the pressure relief valve 200. That is, the insulating film 500 can wrap the insulating plate 400 between the insulating film 500 and the battery cell 300; of course, the insulating film 500 can also only wrap the battery cell 300, while the insulating plate 400 is placed on the outside.

[0104] In a specific embodiment of this application, the distance from the first adhesive area to the notch 202 is 1mm to 30mm. For example, the distance from the first adhesive area to the notch 202 can be 1mm, 3mm, 5mm, 7mm, 9mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, etc. It should be noted that the above values ​​are only specific examples, and those skilled in the art can arbitrarily choose the specific value of the distance from the first adhesive area to the notch 202 within the range of 1mm to 30mm according to their needs.

[0105] This setting avoids the problem of poor bonding effect caused by excessive distance, and also avoids the problem of affecting exhaust caused by insufficient distance.

[0106] In a specific embodiment of this application, the battery cell 300 is disposed on the first end face, which is the end face of the housing assembly 100 where the pressure relief valve 200 is provided. Therefore, the range of dmm×hmm can be 2~600, with the unit being mm. 2 For example, dmm × hmm can be 2mm. 2 40mm 2 80mm 2 130mm 2 180mm 2 230mm 2 270mm 2 330mm 2 380mm 2 430mm 2 480mm 2 530mm 2 600mm 2 It should be noted that the above values ​​are merely specific examples, and those skilled in the art can adjust the values ​​according to their needs within 2mm. 2 ~600mm 2 Choose any specific value of dmm×hmm within the range.

[0107] This application also discloses a battery device, which includes a base plate and at least two individual cells disposed on the base plate. The individual cells are those disclosed in the above embodiments. Because it has the aforementioned individual cells, it possesses all the technical effects of those individual cells, which will not be elaborated upon here.

[0108] As illustrated in this application, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0109] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0110] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0111] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A single-cell battery, characterized in that, The device includes a housing assembly (100), which includes a housing (110) and a cover plate (120). A receiving space is formed between the housing (110) and the cover plate (120). At least one end of the housing (110) is provided with an opening, and the cover plate (120) is disposed at the opening of the housing (110) and blocks the opening. A pressure relief valve (200) is provided on one end face of the housing assembly (100), and the pressure relief valve (200) is provided with a groove (202). It also includes a battery cell (300), which is disposed within the receiving space. An insulating plate (400) is disposed between the battery cell (300) and the pressure relief valve (200). A through portion (420) is disposed on the insulating plate (400), which is disposed corresponding to the pressure relief valve. An extension portion (410) is disposed on the side facing the battery cell (300) and / or the notch (202). The extension portion (410) and the through portion (420) are arranged along a first direction. Along the first direction, the minimum distance from the extension portion (410) to the notch (202) is dmm. Along the second direction, the maximum height of the extension portion (410) is hmm. Therefore, the range of dmm×hmm is 0.5~600, with the unit being mm. 2 ; The second direction is perpendicular to the insulating plate (400), and the first direction is parallel to the large surface of the housing (110) and perpendicular to the second direction.

2. The single-cell battery as described in claim 1, characterized in that, The projection of the area enclosed by the groove (202) onto the insulating plate (400) does not coincide with the extension (410).

3. The single-cell battery as described in claim 1, characterized in that, The extension (410) includes a first extension (411), which is disposed on both sides of the pressure relief valve (200) along the first direction.

4. The single-cell battery as described in claim 3, characterized in that, The distance from the first extension (411) to the groove (202) is dmm, where dmm is 1mm to 150mm.

5. The single-cell battery as described in claim 1, characterized in that, Along the first direction, a single extension (410) includes a first end and a second end, and the distance between the first end and the second end of the extension (410) is 10mm to 200mm.

6. The single-cell battery as described in claim 5, characterized in that, Along the first direction, the ratio of the distance / dmm between the first end and the second end of the extension (410) is 0.1 to 100.

7. The single-cell battery as described in claim 1, characterized in that, Along the second direction, the height of the extension (410) is 0.5mm to 3mm.

8. The single-cell battery as described in claim 3, characterized in that, Along the first direction, the minimum distances between the first extension (411) and the groove (202) respectively located on both sides of the pressure relief valve (200) are d1mm and d2mm respectively, then |d1mm-d2mm|≤20mm.

9. The single-cell battery as described in claim 3, characterized in that, Along a third direction, the first extension (411) includes at least two, wherein the third direction is perpendicular to the first direction and the second direction, respectively; The distance between two adjacent first extensions (411) along the third direction is 1mm to 80mm.

10. The single-cell battery as described in claim 3, characterized in that, Along the third direction, the minimum distance from the first extension (411) to the edge of the insulating plate (400) is 0.5mm to 40mm, and the third direction is perpendicular to the first direction and the second direction, respectively.

11. The single-cell battery as described in claim 3, characterized in that, The extension (410) further includes a second extension (412), which is disposed between the first extension (411) and the edge of the insulating plate (400) along the first direction; Along the first direction, the distance L1 between the second extension (412) and the first extension (411) is 1mm to 180mm.

12. The single-cell battery as described in claim 11, characterized in that, dmm > L1mm, dmm-L1mm is 5mm~100mm.

13. The single-cell battery as described in claim 11, characterized in that, Along the third direction, at least a portion of the width of the second extension (412) is greater than the maximum width of the first extension (411), and the third direction is perpendicular to the first direction and the second direction, respectively.

14. The single-cell battery as described in claim 13, characterized in that, Along the third direction upward, the difference between the maximum width of the second extension (412) and the maximum width of the first extension (411) is 1mm to 70mm.

15. The single-cell battery as described in claim 11, characterized in that, Along the first direction, the second extension (412) includes a central support area and end support areas located at both ends of the central support area; Along the third direction, the width of the middle support area is greater than the width of the end support area, and the third direction is perpendicular to the first direction and the second direction, respectively.

16. The single-cell battery as described in claim 15, characterized in that, The difference between the width of the middle support area and the width of the end support area is 1mm to 50mm.

17. The single-cell battery as described in claim 15, characterized in that, The central support area is provided with a through hole (4121).

18. The single-cell battery as described in claim 17, characterized in that, The minimum distance between the through hole (4121) and the edge of the central support area is 0.5mm to 5mm.

19. The single-cell battery as described in claim 11, characterized in that, Along the first direction, the minimum distance between the second extension (412) and the sidewall of the housing (110) is 1mm to 80mm.

20. The single-cell battery according to any one of claims 1-19, characterized in that, It also includes an insulating film (500) that wraps around the end face and at least one side of the battery cell (300), the insulating film (500) being bonded to the insulating plate (400), and the insulating plate (400) being disposed on one side of the insulating film (500).

21. The single-cell battery as described in claim 20, characterized in that, Along the first direction, at least one end of the insulating film (500) extends beyond the insulating plate (400) by a distance of 0.5 mm to 5 mm.

22. The single-cell battery as described in claim 20, characterized in that, Along the first direction, the end of the insulating plate (400) is provided with a chamfer, and the radius of the chamfer is 1mm~5mm.

23. The single-cell battery as described in claim 20, characterized in that, Along the first direction, a first bonding area is provided between the extension (410) closest to the groove (202) and the groove (202).

24. The single-cell battery as described in claim 23, characterized in that, Along the third direction upward, the width dimension of the first bonding area / the width dimension of the insulating plate (400) is 30%~80%.

25. The single-cell battery as described in claim 23, characterized in that, Along the first direction, the minimum distance between the first adhesive area and the end of the insulating plate (400) is 10mm to 100mm.

26. The single-cell battery as described in claim 23, characterized in that, The first bonding area includes two, and the distance between them is 20mm~100mm.

27. The single-cell battery as described in claim 26, characterized in that, The total thickness of the insulating film (500) and the insulating plate (400) between the two first bonding areas is 0.3 mm to 1.5 mm.

28. The single-cell battery as described in claim 20, characterized in that, The insulating film (500) is provided with a first through hole (501), and the insulating plate (400) is provided with a second through hole (413). The first through hole (501) and the second through hole (413) are staggered, and the minimum distance between them is 0.5mm to 20mm.

29. The single-cell battery as described in claim 28, characterized in that, The area of ​​a single first through hole (501) is 10 mm². 2 ~100mm 2 .

30. The single-cell battery as described in claim 20, characterized in that, The insulating film (500) is disposed between the battery cell (300) and the insulating plate (400).

31. The single-cell battery as described in claim 20, characterized in that, The insulating film (500) is disposed between the insulating plate (400) and the pressure relief valve (200).

32. The single-cell battery as described in claim 26, characterized in that, The distance from the first bonding area to the groove (202) is 1mm to 30mm.

33. The single-cell battery according to any one of claims 1-19, characterized in that, The battery cell (300) is disposed on a first end face, which is the end face of the housing assembly (100) where the pressure relief valve (200) is located. The range of dmm×hmm is 2~600 mm. 2 .

34. A battery device, characterized in that, It includes at least two single-cell batteries as described in any one of claims 1-33.

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