Battery and battery pack

Abstract

A battery and a battery pack. The battery comprises: a housing (1), in which an accommodating chamber is formed, and explosion-proof valves (101) are provided on a side surface of the housing (1), the explosion-proof valves (101) being suitable to be opened at a preset pressure value; a pole group (2), provided in the accommodating chamber; and a support member (3), located between the side surface of the housing (1) provided with the explosion-proof valves (101) and the pole group (2), the support member (3) comprising an annular support main body (301) and a gas exhaust channel (302) surrounded by the support main body (301), the gas exhaust channel (302) covering the explosion-proof valves (101), a plurality of protruding parts (3011) extending towards the gas exhaust channel (302) being constructed on two side parts of the support main body (301) in the width direction, and the plurality of protruding parts (3011) on the same side part being distributed at intervals in the length direction of the support member (3). In the battery and the battery pack, providing the support member (3) between the housing (1) and the pole group (2) enables the support main body (301) to achieve a supporting effect; the gas exhaust channel (302) communicates the space where the pole group (2) is located and the explosion-proof valves (101), thus increasing the gas exhaust area; in addition, the provision of the protruding parts (3011) enables the support member (3) to meet the requirements of support and gas exhaust simultaneously, thereby preventing the pole group (2) from being squeezed and deformed, and ensuring unobstructed gas exhaust.

Description

Batteries and battery packs Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to batteries and battery packs. Background Art

[0002] With the continuous development of battery industry technology, users have higher and higher requirements for batteries. In order to improve the safety performance of battery cells, a pressure relief mechanism is usually set on the battery cells. When the battery cells operate abnormally and gas is generated inside, the gas can be discharged through the pressure relief mechanism to avoid major safety accidents such as explosions. The explosion-proof valve is set on the battery shell as a pressure relief mechanism. For batteries with larger lengths, the explosion-proof valve is usually set on the longer side of the shell to balance the gas transmission path and avoid setting the explosion-proof valve on the end faces at both ends along the length direction, which causes the gas transmission path to be too long. However, due to the small space between the pole group and the inner wall of the shell side, the gas transmission resistance inside the battery will be large, which is not conducive to the rapid discharge of gas inside the battery, and there are safety hazards.

[0003] To address this issue, support members can be installed between the electrode assembly and the side of the housing to create a space for exhaust. However, if the support member's area is too small, the electrode assembly can be easily squeezed and deformed due to gravity, creating a safety hazard. If the support member's area is too large, the exhaust space becomes small, resulting in the same problem of poor exhaust flow. In other words, the support member cannot meet both support and exhaust requirements.

[0004] When a battery experiences an internal short circuit in its cells or modules, or when it's impacted or submerged in water, a large amount of high-temperature gas is generated within a short period of time and accumulates within the battery. Therefore, batteries are typically equipped with explosion-proof valves to allow for the discharge of gas when abnormal battery operation generates internal gas, improving battery safety and preventing major accidents.

[0005] For longer batteries, such as blade batteries, explosion-proof valves are typically installed on the side of the battery casing to shorten the gas transmission path during thermal runaway and facilitate gas discharge. However, the small exhaust space between the side of the casing and the battery cell results in greater resistance to gas transmission within the battery, hindering the rapid discharge of gas inside the battery and posing a safety hazard.

[0006] With the booming development of the new energy vehicle industry, consumers are increasingly demanding higher safety performance from new energy vehicles. However, the increased battery capacity, range, and use of high-nickel systems also increase the risk of battery runaway. When a battery experiences an internal short circuit, or is struck by a collision or submerged in water, it quickly generates a large amount of high-temperature gas, which accumulates within the battery. Therefore, to improve battery safety, batteries are typically equipped with explosion-proof valves. When abnormal battery operation generates internal gas, the gas can be discharged through the valve to prevent major safety incidents.

[0007] For longer batteries, such as blade batteries, placing explosion-proof valves on the end covers of the battery casing would result in a long gas transmission path, hindering gas discharge. Therefore, explosion-proof valves are typically placed on the sides of the battery casing to balance the gas transmission path during thermal runaway. However, the small exhaust space between the sides of the casing and the electrode group results in greater resistance to gas transmission within the battery, hindering the rapid discharge of gas from the battery and posing a safety hazard.

[0008] With the continuous development of battery industry technology, users have higher and higher requirements for batteries. In order to improve the safety performance of battery cells, a pressure relief mechanism is usually set on the battery cells. When the battery cells operate abnormally and gas is generated inside, the gas can be discharged through the pressure relief mechanism to avoid major safety accidents such as explosions. The explosion-proof valve is set on the battery shell as a pressure relief mechanism. For batteries with larger length dimensions, the explosion-proof valve is usually set on the longer side of the shell to balance the gas transmission path and avoid setting the explosion-proof valve on the end faces at both ends along the length direction, which causes the gas transmission path to be too long. However, due to the small space between the pole group and the inner wall of the shell side, the gas transmission resistance inside the battery will be large, which is not conducive to the rapid discharge of gas inside the battery. If the gas inside the battery cannot be discharged in time, there will be serious safety hazards.

[0009] Summary of the Invention

[0010] In view of this, the present invention provides a battery and a battery pack to solve the problem that the support members in existing batteries are difficult to meet both support and exhaust requirements.

[0011] In a first aspect, the present invention provides a battery, comprising: a shell having a accommodating cavity formed therein, an explosion-proof valve being provided on a side of the shell, the explosion-proof valve being suitable for opening at a preset pressure value; a pole group being provided in the accommodating cavity; a support member being located between the side of the shell having the explosion-proof valve provided thereon and the pole group, the support member comprising an annular support body and an exhaust channel formed by the support body, the exhaust channel covering the explosion-proof valve, and a plurality of protrusions extending toward the exhaust channel being constructed on both sides of the support body along the width direction, and the plurality of protrusions on the same side being spaced apart along the length direction of the support member.

[0012] Beneficial effect: By arranging a support member between the shell and the electrode group, the support member is located in the accommodating cavity of the shell, one side of the support body abuts against the inner wall of the side of the shell where the explosion-proof valve is provided, and the other side abuts against the electrode group, playing a supporting role between the electrode group and the shell, so that there is a certain distance between the electrode group and the shell. At the same time, the exhaust channel connects the space where the electrode group is located and the explosion-proof valve, which is convenient for the gas in the accommodating cavity to pass through, increases the exhaust area, and ensures that the gas in the accommodating cavity is discharged to the position where the explosion-proof valve is located in time, thereby ensuring that the explosion-proof valve is opened in time at the preset pressure value, thereby ensuring the safety of the battery. In addition, by arranging a protrusion on the support body, the area of ​​the support body is increased, and the support member is ensured to have good supporting performance. The protrusion is smaller than the size of the support member, which can minimize the obstruction to the exhaust of the exhaust channel, so that the support member meets the support and exhaust requirements at the same time, which can avoid the extrusion and deformation of the electrode group and ensure smooth exhaust.

[0013] In an optional embodiment, the protrusions on different sides are staggered.

[0014] Beneficial effects: By staggering the protrusions on the two opposite sides, the two protrusions are prevented from being directly opposite to each other, so that the exhaust space is more sufficient, the gas flow resistance is smaller, and the exhaust is smoother. Compared with the structure in which the two protrusions are directly opposite to each other, the staggered distribution between the protrusions can appropriately increase the size of the protrusions along the width direction without affecting the smoothness of the exhaust. At the same time, it also increases the support area, making the support of the pole group by the support member more effective.

[0015] In an optional embodiment, the total area of ​​the support member is S, and the area of ​​the support body is S1, wherein 0.3≤S1 / S≤0.7.

[0016] Beneficial effect: Setting the ratio of the area S1 of the support body to the total area S of the support member between 0.3 and 0.7 can ensure that the support body can provide effective support while ensuring smooth exhaust and improving battery safety.

[0017] In an optional embodiment, a dimension of the support member along its width direction is b, and a distance between two protrusions located on different sides of the support body along the width direction is e, wherein e≥0.1b.

[0018] Beneficial effect: Setting e to a value greater than or equal to 0.1b can ensure that the exhaust channel has sufficient exhaust area, thereby ensuring the exhaust effect.

[0019] In an optional embodiment, a dimension d of the side portion of the support body along the width direction and a dimension b of the support member along the width direction satisfy: 0.1≤d / b≤0.2.

[0020] Beneficial effect: Setting the ratio of d to b within the range of 0.1-0.2 not only facilitates the processing and molding of the support, increases the strength of the support, and prevents deformation, but also ensures sufficient exhaust area and smooth exhaust.

[0021] In an optional embodiment, the distance L between two adjacent protrusions on the same side of the support body is in the range of 50 mm to 200 mm.

[0022] Beneficial effect: Setting the distance L between two adjacent protrusions on the same side of the support body to a value range of 50mm-200mm can ensure both the smoothness of the exhaust and the sufficient supporting effect of the support member.

[0023] In an optional embodiment, the thickness of the support member ranges from 0.5 mm to 5 mm.

[0024] Beneficial effect: Setting the thickness of the support member 3 to a value range of 0.5 mm-5 mm can ensure sufficient exhaust space and smooth exhaust, and can also improve the energy density of the battery.

[0025] In an optional embodiment, the protrusion is configured in a semicircular or polygonal shape.

[0026] Beneficial effects: Both semicircular and polygonal shapes can achieve the supporting function of the protrusion, and there are more choices and it is easy to process.

[0027] In an optional embodiment, the polygon includes one or more of a triangle, a rectangle, and a trapezoid.

[0028] Advantageous Effects: Triangular, rectangular, and trapezoidal shapes are simple in structure, easy to process, and low in manufacturing cost. In a second aspect, the present invention also provides a battery pack comprising the aforementioned battery. Because the battery pack includes the battery, it has the same effects as the battery and will not be further described here.

[0029] In view of this, the present invention provides a battery and a battery pack to solve the problem that the exhaust space between the side of the shell and the battery cell is small, which will lead to large gas transmission resistance inside the battery, hinder the rapid discharge of gas inside the battery, and pose a safety hazard.

[0030] In a third aspect, the present invention provides a battery, comprising: an outer shell, forming an accommodation space inside; an explosion-proof valve, arranged on the side of the outer shell; a battery cell, located in the accommodation space; a support member, arranged in the accommodation space, the support member being located between the side of the outer shell where the explosion-proof valve is provided and the battery cell; the support member comprising an annular body and a limiting portion, the limiting portion being supported on both sides of the inner ring of the annular body along the width direction of the annular body; a thinning area is provided on the annular body, and a plurality of thinning areas are arranged at intervals along the circumference of the annular body, and the thinning area extends along the width direction of the annular body.

[0031] Beneficial effects: By setting a support member, which is supported between the side of the shell and the battery cell, an exhaust space is reserved between the shell and the battery cell, which reduces the gas transmission resistance, facilitates the rapid discharge of gas inside the battery, and ensures the safety of the battery; and, by setting a limit part, the two sides of the annular body are supported inside the annular body, avoiding the support member from being concave and deformed in the width direction, facilitating the assembly of the support member, and ensuring the exhaust effect of the center hole of the annular body; by setting a thinning area on the annular body, when the predetermined pressure is reached inside the battery, the annular body is torn at the thinning area, so that the gas outside the support member in the accommodating space enters the center hole of the annular body through the torn thinning area, and is discharged from the explosion-proof valve, thereby improving the exhaust efficiency of the gas in the battery.

[0032] In an optional embodiment, one or more thinning areas are provided on the two long sides and / or the two short sides of the annular body.

[0033] Beneficial effect: The gas outside the two long sides and the two short sides of the annular body in the accommodating space can quickly enter the central hole of the annular body, shortening the gas transmission path and facilitating gas discharge.

[0034] In an optional embodiment, the thinned area located on the long side of the annular body is arranged corresponding to the position of the explosion-proof valve.

[0035] Beneficial effect: The transmission path of gas to the explosion-proof valve is shortened, and the gas is discharged quickly.

[0036] In an optional embodiment, two thinning areas are spaced apart on the short side of the annular body, the center distance between the two thinning areas is d, the width of the central hole of the annular body is c, and d≥0.5*c is satisfied.

[0037] Beneficial effect: When the two thinning areas are torn, the part of the annular body located between the two thinning areas breaks off, forming an opening at the short side of the annular body, which is conducive to the gas outside the short side of the annular body entering the central hole; and, d≥0.5*c, ensuring the opening width, which is conducive to the gas entering the central hole.

[0038] In an optional embodiment, the thickness of the support member is h, the thickness of the thinning area is e, satisfying 0.05*h≤e≤0.2*h; and / or, two explosion-proof valves are arranged at intervals, the center distance between the two explosion-proof valves is y, the length of the battery is L, satisfying 1 / 3≤y / L≤1 / 2; and / or, the length of the battery L≥300mm, the width of the battery D≤30mm; and / or, the length of the battery is L, the width of the battery is D, satisfying L / D≥10; and / or, the width of the outer shell is B, the width of the support member is b, satisfying b≥0.5*B; and / or, the wall thickness of the side of the outer shell on which the explosion-proof valve is provided is g, satisfying g≥0.95mm; and / or, the thickness of the support member is h, satisfying 0.5mm≤h≤2mm.

[0039] Beneficial Effects: 0.05*h≤e≤0.2*h ensures sufficient support strength while enabling the thinned area to tear under a predetermined pressure. 1 / 3≤y / L≤1 / 2 ensures that gas at all locations within the containment space can reach the explosion-proof valve via a short transmission path. L≥300mm, D≤30mm, and / or L / D≥10. Therefore, the support is suitable for batteries with a long and narrow annular body, resulting in a longer and narrower annular body, which is prone to inward deformation at its longitudinal center. Therefore, a stopper provides support for the annular body and prevents deformation. b≥0.5*B ensures that the support provides effective support between the battery cell and the casing, effectively reducing gas transmission resistance. g≥0.95mm ensures the installation strength of the explosion-proof valve. 0.5mm≤h≤2mm ensures sufficient support strength while preventing the support from excessively occupying internal battery space, thereby increasing battery energy density.

[0040] In an optional embodiment, the limiting portion includes a first section and a second section, the first end of the first section is connected to one side of the inner ring of the annular body, the first end of the second section is connected to the other side of the inner ring of the annular body, and the second end of the first section and the second end of the second section are arranged close to each other.

[0041] Beneficial effects: The first division and the second division are arranged close to each other to ensure the overall supporting effect of the limiting part on the annular body; there is a gap between the second end of the first division and the second end of the second division. During the exhaust process, when the gas reaches a predetermined pressure, the first division and the second division can be offset and moved respectively along the length direction, so that the center holes on both sides of the limiting part can be connected, so that the gas can be effectively discharged to the explosion-proof valve.

[0042] In an optional embodiment, the gap between the second end of the first subsection and the second end of the second subsection is less than 0.5 mm;

[0043] Beneficial effect: While ensuring that the first section and the second section can generate offset movement under a predetermined pressure, the supporting effect of the first section and the second section on the annular body is ensured.

[0044] and / or, an included angle α between the side wall of the first sub-part and the inner ring of the annular body is greater than or equal to 120°, and an included angle α between the side wall of the second sub-part and the inner ring of the annular body is greater than or equal to 120°;

[0045] Beneficial effect: It prevents gas from generating eddy currents at the connection between the side wall of the first section and the inner ring of the annular body and at the connection between the side wall of the second section and the inner ring of the annular body, thereby ensuring smooth transition of the gas.

[0046] And / or, the side wall of the first subsection is connected to the second end of the first subsection via an arc-shaped transition structure, and the side wall of the second subsection is connected to the second end of the second subsection via an arc-shaped transition structure.

[0047] Beneficial effect: The blocking effect of the first sub-section and the second sub-section on the gas is reduced, so that the gas can flow smoothly between the central holes on both sides of the limiting portion.

[0048] In an optional embodiment, the support member further includes a protrusion connected to the inner wall of the annular body and extending toward the central hole of the annular body.

[0049] Beneficial effect: while ensuring the exhaust space of the central hole of the annular body, the supporting area of ​​the support member between the shell and the battery cell is increased.

[0050] In an optional embodiment, the total area of ​​the side of the support member facing the explosion-proof valve is S, the sum of the areas of the annular body and the side of the protrusion facing the explosion-proof valve is S1, satisfying 0.2≤S1 / S≤0.8; and / or, the width of the support member is b, the spacing between the two protrusions along the width direction of the support member is f, satisfying f≥0.25*b.

[0051] Beneficial effect: 0.2≤S1 / S≤0.8 ensures that the support member has sufficient support area while allowing gas to flow smoothly in the center hole. Setting f≥0.25*b ensures that gas can flow smoothly in the center hole along the length direction.

[0052] In a fourth aspect, the present invention further provides a battery pack comprising the above-mentioned battery.

[0053] In view of this, the present invention provides a battery and a battery pack to solve the problem that the exhaust space between the side of the shell and the electrode group is small, which will lead to large gas transmission resistance inside the battery, hinder the rapid discharge of gas inside the battery, and pose a safety hazard.

[0054] In a fifth aspect, the present invention provides a battery, comprising: a shell, forming a accommodating space inside; an explosion-proof valve, arranged on a side of the shell; a pole group, located in the accommodating space; a support member, arranged in the accommodating space, the support member being located between the side of the shell where the explosion-proof valve is arranged and the pole group; the support member comprising an annular body and a limiting portion, the limiting portion being supported on both sides of the inner ring of the annular body along the width direction of the annular body.

[0055] By providing a support member, which is supported between the side of the shell and the pole group, an exhaust space is reserved between the shell and the pole group, which reduces the gas transmission resistance, facilitates the rapid discharge of gas inside the battery, and ensures the safety of the battery; and by providing a limit portion, the two sides of the annular body are supported inside the annular body, avoiding the support member from being concave and deformed in the width direction, facilitating the assembly of the support member, and ensuring the exhaust effect of the center hole of the annular body.

[0056] In an optional embodiment, the limiting portion includes a first subsection and a second subsection, wherein the first end of the first subsection is connected to one side of the inner ring of the annular body, the first end of the second subsection is connected to the other side of the inner ring of the annular body, and the second end of the first subsection and the second end of the second subsection are arranged close to each other. The first subsection and the second subsection are arranged close to each other to ensure the supporting effect of the limiting portion on the annular body as a whole; a gap is provided between the second end of the first subsection and the second end of the second subsection. During the exhaust process, when the gas reaches a predetermined pressure, the first subsection and the second subsection can be offset and moved in the longitudinal direction respectively, so that the central holes on both sides of the limiting portion can be connected, so that the gas can be effectively discharged to the explosion-proof valve.

[0057] In an optional embodiment, the gap between the second end of the first subsection and the second end of the second subsection is less than 0.5 mm, thereby ensuring that the first subsection and the second subsection can generate offset movement under a predetermined pressure while ensuring the supporting effect of the first subsection and the second subsection on the annular body.

[0058] In an optional embodiment, the angle α between the side wall of the first subsection and the inner ring of the annular body is greater than or equal to 120°, and / or the angle α between the side wall of the second subsection and the inner ring of the annular body is greater than or equal to 120°. This prevents gas from generating eddy currents at the junctions of the side wall of the first subsection and the inner ring of the annular body, and at the junctions of the side wall of the second subsection and the inner ring of the annular body, thereby ensuring a smooth transition of gas.

[0059] In an optional embodiment, the sidewall of the first subsection is connected to the second end of the first subsection via an arcuate transition structure, and / or the sidewall of the second subsection is connected to the second end of the second subsection via an arcuate transition structure. Thus, the gas obstruction effect of the first and second subsections is reduced, allowing gas to flow smoothly between the central holes on both sides of the limiting portion.

[0060] In an optional embodiment, the limiting portion is provided with one, and is located at a middle position along the length of the annular body; or, the limiting portion is provided with multiple, and is spaced apart along the length of the annular body, so as to ensure the exhaust space of the central hole of the annular body while ensuring the supporting effect of the limiting portion on the annular body.

[0061] In an optional embodiment, the battery length L is greater than or equal to 300 mm, and the battery width D is less than or equal to 30 mm. Therefore, the support member is used for batteries with a longer length and a smaller width, resulting in the annular body being longer and narrower. The middle portion of the annular body along the length direction is prone to inward concavity and deformation. Therefore, by providing a limiter, support is provided to the annular body to prevent deformation.

[0062] In an optional embodiment, the center hole of the annular body is arranged corresponding to the explosion-proof valve. Therefore, the gas in the battery can directly reach the explosion-proof valve after passing through the center hole of the annular body, facilitating the gas to pass through and be discharged.

[0063] In an optional embodiment, the support member further includes a protrusion connected to the inner wall of the annular body and extending toward the central hole of the annular body, thereby ensuring exhaust space in the central hole of the annular body and increasing the support area of ​​the support member between the housing and the pole group.

[0064] In a sixth aspect, the present invention further provides a battery pack comprising the above-mentioned battery.

[0065] In view of this, the present invention provides a battery and a battery pack to solve the problem that gas inside the existing battery cannot be discharged in time.

[0066] In the seventh aspect, the present invention provides a battery, comprising: a shell having a accommodating cavity formed therein, an explosion-proof valve being provided on the side of the shell, and the explosion-proof valve being suitable for opening at a first preset pressure value; a pole group being provided in the accommodating cavity; a support member being located between the side of the shell having the explosion-proof valve provided thereon and the pole group, at least one fracture zone being constructed on the support member, at least a part of the fracture zone being constructed as a thinning portion, the thickness of the thinning portion being smaller than the thickness of the main body of the support member, and the thinning portion being suitable for breaking at a second preset pressure value to connect the accommodating cavity and the explosion-proof valve, wherein the second preset pressure value is smaller than the first preset pressure value.

[0067] Beneficial effect: By arranging a support member between the shell and the pole group, the support member is located in the accommodating cavity of the shell, one side of the support member abuts against the inner wall of the side of the shell where the explosion-proof valve is provided, and the other side abuts against the pole group, the support member plays a supporting role between the pole group and the shell, so that there is a certain distance between the pole group and the shell. At the same time, by constructing a fracture zone on the support member, the thinning part of the fracture zone breaks before the explosion-proof valve is opened, thereby connecting the explosion-proof valve and the accommodating cavity where the pole group is provided, increasing the exhaust space, and facilitating the gas in the accommodating cavity to be discharged to the position of the explosion-proof valve in time, thereby ensuring that the gas in the battery can be discharged through the explosion-proof valve in time, thereby ensuring the safety of the battery.

[0068] In an optional embodiment, the thickness of the thinned portion is H1, and the thickness of the main portion of the support member is H, wherein 0.05≤H1 / H≤0.5.

[0069] Beneficial effect: Setting the ratio of the thickness H1 of the thinning portion to the thickness H of the support body in the range of 0.05-0.5 can ensure that the support has sufficient strength to avoid deformation at the thinning portion, and can also avoid excessive strength of the thinning portion to ensure that the thinning portion can break in time.

[0070] In an optional embodiment, each of the fracture zones has at least two thinning portions arranged at intervals.

[0071] Beneficial effects: By setting at least two thinning parts arranged at intervals, after the thinning part breaks, the area between at least two thinning parts can be separated from the supporting body as a whole, thereby forming a larger fracture zone, increasing the gas circulation space, and being more conducive to the gas around the support part flowing into the exhaust channel, thereby facilitating timely discharge of the gas; and the manner in which at least two thinning parts are arranged at intervals can reduce the size of each thinning part, thereby avoiding the problem of insufficient strength of the supporting body caused by the excessive size of a single thinning part, thereby improving the stability of the structure.

[0072] In an optional embodiment, the support member includes an annular support body and an exhaust channel surrounded by the support body, the fracture zone is provided on the support body, and the thinning portion is connected between the inner ring and the outer ring of the support body.

[0073] Beneficial effects: The supporting body plays a supporting role between the electrode group and the outer shell, ensuring that there is a certain distance between the electrode group and the outer shell. At the same time, the exhaust channel connects the space where the electrode group is located with the explosion-proof valve, which is convenient for the gas in the accommodating chamber to pass through, increases the exhaust area, and ensures that the gas at the position of the electrode group in the accommodating chamber can be discharged to the position of the explosion-proof valve through the exhaust channel in time. Moreover, the thinning portion breaks before the explosion-proof valve is opened, and a gap is formed on the supporting body, which can connect the space outside the support member with the exhaust channel, ensuring that the gas outside the support member can enter the exhaust channel in time, and then be discharged from the exhaust channel to the position of the explosion-proof valve, thereby ensuring that the gas at any position in the battery can be discharged through the explosion-proof valve in time, thereby ensuring the safety of the battery.

[0074] In an optional embodiment, the support member is in a "U" shape, and the support body has two first side portions located at both ends of the support member in the length direction and two second side portions located at both ends of the support member in the width direction.

[0075] Beneficial effect: The "U"-shaped structure is easy to process and can be adapted to the space inside the shell.

[0076] In an optional embodiment, a fracture zone is provided on each first side portion, and the fracture zone has two thinning portions spaced apart, the distance between the two thinning portions is L1, and the dimension of the exhaust channel along the width direction is L, wherein 0.2≤L1 / L≤1.

[0077] Beneficial effect: Setting the ratio between the distance L1 between the two thinning portions and the dimension L of the exhaust channel along the width direction to be between 0.2-1 can ensure that after the thinning portion is destroyed, the cross-sectional area of ​​the gas-guiding channel formed in the fracture zone is large enough to ensure that the gas around the support member can smoothly enter the exhaust channel.

[0078] In an optional embodiment, the support member has an explosion-proof corresponding area corresponding to the explosion-proof valve, and the fracture area is provided on the second side portion located in the explosion-proof corresponding area, and the fracture area has at least two thinning portions arranged at intervals.

[0079] Beneficial effect: By providing an explosion-proof corresponding area corresponding to the explosion-proof valve on the support member and setting a fracture area on the second side portion located in the explosion-proof corresponding area, when the thinning portion in the fracture area is broken, the gas channel formed on the fracture area can directly guide the gas around the support member to the position corresponding to the explosion-proof valve, reducing the gas diversion distance, thereby discharging the gas around the support member as soon as possible, and further improving the safety of the battery.

[0080] In an optional embodiment, the distance between two adjacent thinned portions on the second side portion is L2, and the dimension of the explosion-proof valve along the length direction of the support member is L3, wherein 0.1≤L2 / L3≤1.2.

[0081] Beneficial effect: Setting the ratio between the distance L2 between two adjacent thinning portions on the second side and the length L3 of the explosion-proof valve in the range of 0.8-1.2 can not only ensure that sufficient exhaust area can be formed after the fracture zone is broken, but also ensure that the supporting body effectively supports the pole group.

[0082] In an optional embodiment, a plurality of protrusions extending toward the exhaust passage are configured on the second side portion of the support body, and the plurality of protrusions on each second side portion are spaced apart along the length direction of the support member.

[0083] Beneficial effect: By arranging a protrusion on the second side, the area of ​​the supporting body is increased, ensuring that the support member has good supporting performance, and the protrusion is small in size, which can minimize the obstruction to the exhaust of the exhaust channel, so that the support member can meet the needs of support and exhaust at the same time, which can avoid the extrusion deformation of the pole group and ensure smooth exhaust.

[0084] In an eighth aspect, the present invention further provides a battery pack, comprising: the above-mentioned battery. Since the battery pack includes the battery and has the same effects as the battery, it will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0085] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0086] FIG1 is a schematic structural diagram of a battery according to an embodiment of the present invention;

[0087] FIG2 is a front view of the battery shown in FIG1 ;

[0088] FIG3 is a cross-sectional view taken along the AA direction in FIG2 ;

[0089] FIG4 is a partial enlarged schematic diagram of A in FIG2 ;

[0090] FIG5 is a schematic diagram of the exploded structure of the battery shown in FIG1 ;

[0091] FIG6 is a schematic structural diagram of an electrode group and a support member according to an embodiment of the present invention;

[0092] FIG7 is a schematic structural diagram of a support member according to an embodiment of the present invention;

[0093] FIG8 is a top view of the support member shown in FIG7 ;

[0094] FIG9 is a partial enlarged schematic diagram of B in FIG8 ;

[0095] FIG10 is a partial enlarged schematic diagram of C in FIG8 ;

[0096] FIG11 is a schematic structural diagram of a housing and an explosion-proof valve according to an embodiment of the present invention;

[0097] FIG12 is a schematic structural diagram of an insulating protective film according to an embodiment of the present invention.

[0098] FIG13 is a schematic diagram of the overall structure of a battery according to an embodiment of the present invention;

[0099] FIG14 is a schematic diagram of the exploded structure of a battery according to an embodiment of the present invention;

[0100] FIG15 is a schematic structural diagram of a housing and an explosion-proof valve according to an embodiment of the present invention;

[0101] FIG16 is a top view of the battery shown in FIG13 ;

[0102] FIG17 is a schematic structural diagram of a battery cell and a support member according to an embodiment of the present invention;

[0103] FIG18 is a schematic structural diagram of a support member according to an embodiment of the present invention;

[0104] FIG19 is a schematic diagram of the main structure of FIG17;

[0105] FIG20 is a schematic diagram of a partial structure of a support member according to an embodiment of the present invention;

[0106] FIG21 is a schematic diagram of another partial structure of a support member according to an embodiment of the present invention;

[0107] FIG22 is a schematic cross-sectional view of BB in FIG19 ;

[0108] FIG23 is a schematic diagram of a partial structure of a position limiting portion according to an embodiment of the present invention;

[0109] FIG24 is a schematic cross-sectional structural diagram of AA in FIG16 .

[0110] FIG25 is a schematic diagram of the exploded structure of a battery according to an embodiment of the present invention;

[0111] FIG26 is a schematic structural diagram of an electrode group and a support member according to an embodiment of the present invention;

[0112] FIG27 is a schematic structural diagram of a support member according to an embodiment of the present invention;

[0113] FIG28 is a schematic diagram of the main structure of FIG27;

[0114] FIG29 is a schematic diagram of the partial structure of the limiting portion according to an embodiment of the present invention.

[0115] FIG30 is a cross-sectional view taken along the AA direction in FIG2 ;

[0116] FIG31 is a schematic diagram of the exploded structure of the battery shown in FIG1 ;

[0117] FIG32 is a schematic structural diagram of an electrode group and a support member according to an embodiment of the present invention;

[0118] FIG33 is a schematic structural diagram of a support member according to an embodiment of the present invention;

[0119] FIG34 is a top view of the support member shown in FIG33;

[0120] FIG35 is a partial enlarged schematic diagram of B in FIG34;

[0121] FIG36 is a partial enlarged schematic diagram of the explosion-proof corresponding area in FIG34;

[0122] FIG37 is a partial enlarged schematic diagram of C in FIG34;

[0123] FIG38 is a side view of the support member shown in FIG33;

[0124] FIG39 is a schematic structural diagram of a housing and an explosion-proof valve according to an embodiment of the present invention.

[0125] Explanation of Reference Numerals: 1. Housing; 101. Explosion-proof Valve; 102. Housing; 103. Cover; 104. Insulation Protective Film; 2. Electrode Group; 3. Support; 301. Support Body; 3011. Protrusion; 302. Exhaust Channel; 303. Limiter; 3031. First Limiter; 3032. Second Limiter. 11. Housing; 1101. Accommodation Space; 1102. Housing; 1103. Cover; 1104. Insulation Protective Film; 12. Explosion-proof Valve; 13. Battery Cell; 14. Support; 1401. Annular Body; 14011. Thinned Area; 14012. Center Hole; 1402. Limiter; 14021. First Subsection; 14022. Second Subsection; 1403. Protrusion. 2102, shell; 2103, cover plate; 2104, insulating protective film; 22, explosion-proof valve; 23, pole group; 24, support member; 2401, annular body; 24011, center hole; 2402, limiting part; 24021, first subdivision; 24022, second subdivision; 2403, protrusion. 3101, explosion-proof valve; 3102, shell; 3103, cover plate; 3104, insulating protective film; 32, pole group; 33, support member; 3301, supporting body; 33011, first side portion; 33012, second side portion; 33013, protrusion; 3302, exhaust channel; 3303, fracture zone; 33031, thinning portion; 3304, explosion-proof corresponding area; 3305, limiting portion; 33051, first limiting portion; 33052, second limiting portion. DETAILED DESCRIPTION

[0126] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0127] The following describes an embodiment of the present invention with reference to FIG1 to FIG12.

[0128] According to an embodiment of the present invention, in one aspect, a battery is provided, comprising: a housing 1, an electrode group 2, and a support member 3. Specifically, a housing 1 defines an interior housing cavity, a side of which is provided with an explosion-proof valve 101, adapted to open at a preset pressure; the electrode group 2 is disposed within the housing cavity; and the support member 3 is positioned between the side of the housing 1 provided with the explosion-proof valve 101 and the electrode group 2. The support member 3 comprises an annular support body 301 and an exhaust passage 302 formed by the support body 301, the exhaust passage 302 covering the explosion-proof valve 101. The support body 301 is provided with a plurality of protrusions 3011 extending toward the exhaust passage 302 on both sides along its width, with the protrusions 3011 on the same side being spaced apart along the length of the support member 3.

[0129] In the battery of this embodiment, a support member 3 is provided between the outer shell 1 and the electrode group 2. The support member 3 is located in the accommodating cavity of the outer shell 1. One side of the support body 301 abuts against the inner wall of the side of the outer shell 1 where the explosion-proof valve 101 is provided, and the other side abuts against the electrode group 2, playing a supporting role between the electrode group 2 and the outer shell 1, so that there is a certain distance between the electrode group 2 and the outer shell 1. At the same time, the exhaust channel 302 connects the space where the electrode group 2 is located with the explosion-proof valve 101, which facilitates the gas in the accommodating cavity to pass through, increases the exhaust area, and ensures that the gas in the accommodating cavity The gas is discharged to the location of the explosion-proof valve 101 in a timely manner, thereby ensuring that the explosion-proof valve 101 is opened in time at the preset pressure value, ensuring the safety of the battery, and by providing a protrusion 3011 on the support body 301, the area of ​​the support body 301 is increased, ensuring that the support member 3 has good supporting performance, and the protrusion 3011 is smaller than the size of the support member 3, which can minimize the obstruction to the exhaust of the exhaust channel 302, so that the support member 3 meets the needs of support and exhaust at the same time, which can avoid the extrusion deformation of the pole group 2 and ensure smooth exhaust.

[0130] It should be noted that the side of the shell 1 refers to the surface on the shell 1 extending along the "length direction" indicated by the arrow in Figure 1, preferably one of the narrower side surfaces; the preset pressure value is a preset constant value. When the gas pressure inside the battery reaches the preset pressure value, the explosion-proof valve 101 opens to prevent the battery from exploding due to excessive internal gas pressure; when the gas pressure inside the battery is too high, the gas in the accommodating cavity flows to the explosion-proof valve 101 through the exhaust channel 302 on the support 3, and the explosion-proof valve 101 is broken by the high-pressure gas. After opening, the explosion-proof valve 101 can discharge the gas in the battery; the width direction refers to the "width direction" indicated by the arrow in Figure 8; the length direction refers to the "length direction" indicated by the arrows in Figures 1 and 8.

[0131] Specifically, the shape of the support member 3 is adapted to the side of the housing 1 where the explosion-proof valve 101 is provided. The support member 3 is constructed in a "U" shape and can be formed by die-cutting, which is low-cost and easy to form.

[0132] Specifically, the number of explosion-proof valves 101 can be one or more, and the specific number can be set according to design requirements.

[0133] In one embodiment, the housing 1 is a closed structure, thereby enclosing a housing cavity. Specifically, the housing 1 includes a shell 102 and a cover plate 103. The shell 102 is open at both ends. Two cover plates 103 are provided, and the two cover plates 103 respectively close the two openings at the ends of the shell 102. The cover plates 103 are electrically connected to the electrode group 2.

[0134] In addition, in other embodiments, one end of the shell 102 is open, and the other end of the shell 102 is closed. One cover plate 103 is provided, and one cover plate 103 is closed at the opening at one end of the shell 102 .

[0135] In one embodiment, further shown in FIG5 , the housing 1 further includes an insulating protective film 104, which is disposed between the inner surface of the housing 102 and the electrode group 2 to insulate the electrode group 2 from the housing 102. Specifically, the insulating protective film 104 is disposed on the outside of the support member 3, i.e., the support member 3 is located between the insulating protective film 104 and the electrode group 2. When the battery needs to be vented, the battery is in a high-temperature and high-pressure state, and the provision of the insulating protective film 104 does not affect the discharge of gas.

[0136] In one embodiment, the protrusions 3011 on different sides are staggered. It should be noted that the different sides refer to two sides arranged opposite to each other along the width direction of the support member 3. By staggering the protrusions 3011 on the two opposite sides, it is avoided that the two protrusions 3011 are directly opposite to each other, so that the exhaust space is more sufficient, the gas flow resistance is smaller, and the exhaust is smoother. In addition, compared with the structure in which the two protrusions 3011 are directly opposite to each other, the staggered distribution between the protrusions 3011 can appropriately increase the size of the protrusions 3011 along the width direction without affecting the smoothness of the exhaust. At the same time, it also increases the support area, making the support member 3 more effective in supporting the electrode group 2.

[0137] In one embodiment, the total area of ​​the support member 3 is S, and the area of ​​the support body 301 is S1, wherein 0.3≤S1 / S≤0.7. It should be noted that the total area S of the support member 3 refers to the sum of the areas of the support body 301 and the exhaust channel 302. The support body 301 is supported between the electrode group 2 and the shell 102. If the area S1 of the support body 301 is less than 0.3S, the area of ​​the support body 301 will be insufficient and it will not be able to effectively support the electrode group 2. The electrode group 2 will be deformed and sunken toward the side where the explosion-proof valve 101 is provided, thereby blocking the exhaust channel 302 and preventing the gas from being discharged in time. If the area S1 of the support body 301 is greater than 0.7S, the support member 3 can effectively support the electrode group 2, but the area of ​​the exhaust channel 302 is reduced, the exhaust space is insufficient, the resistance encountered during gas discharge is large, the gas cannot be discharged in time, and there is a safety risk. Therefore, the ratio of the area S1 of the support body 301 to the total area S of the support member 3 is set between 0.3-0.7, which can ensure that the support body 301 can provide effective support and ensure smooth exhaust, thereby improving the safety of the battery. Preferably, the area of ​​the support body 301 is S1 = 0.5S.

[0138] In one embodiment, the width dimension of the support member 3 is b, and the distance between the two protrusions 3011 located on different sides of the support body 301 along the width dimension is e, where e ≥ 0.1b. Further referring to Figures 8 and 9, the width dimension refers to the "width direction" indicated by the arrows in Figures 8 and 9. The distance e between the protrusions 3011 on two opposing sides of the support body 301 along the width dimension is the minimum width dimension of the exhaust channel 302. The size of e directly affects the exhaust efficiency of the exhaust channel 302. If e is less than 0.1b, the area of ​​the exhaust channel 302 is too small, the exhaust space is insufficient, the gas encounters greater resistance during exhaust, and the gas cannot be exhausted in a timely manner, posing a safety risk. Therefore, setting e to a value greater than or equal to 0.1b can ensure that the exhaust channel 302 has sufficient exhaust area, thereby ensuring exhaust efficiency. Preferably, e = 0.35b.

[0139] In one embodiment, the width dimension d of the side of the support body 301 and the width dimension b of the support member 3 satisfy the following relationship: 0.1 ≤ d / b ≤ 0.2. Further referring to Figures 8 and 9, if the ratio of the width dimension d of the side of the support body 301 to the width dimension b of the support member 3 is less than 0.1b, the side of the support body 301 is too small, making the support member 3 difficult to manufacture and prone to deformation. If the ratio of d to b is greater than 0.2b, the side of the support body 301 is too large, the area of ​​the exhaust channel 302 is correspondingly reduced, and the exhaust space is insufficient, resulting in gas not being able to be discharged in time, posing a safety risk. Therefore, setting the ratio of d to b within the range of 0.1-0.2 not only facilitates the processing and forming of the support member 3, increases the strength of the support member 3, prevents deformation, but also ensures sufficient exhaust area and smooth exhaust. Preferably, d = 0.15b.

[0140] In one embodiment, the distance L between two adjacent protrusions 3011 on the same side of the support body 301 is in the range of 50mm-200mm. Further in combination with Figures 8 and 9, the same side refers to any one of the two side portions on both sides of the support body 301 along the width direction. The protrusions 3011 on the same side are evenly spaced. If the distance L between two adjacent protrusions 3011 is less than 50mm, the number of protrusions 3011 provided on the support body 301 is too large, and the density of the protrusions 3011 is too high, which will occupy too much area of ​​the exhaust channel 302, reducing the area of ​​the exhaust channel 302 and affecting the smoothness of the exhaust. In addition, the weight of the support body 301 increases accordingly, which reduces the energy density of the battery. If the distance L between two adjacent protrusions 3011 is less than 50mm, the number of protrusions 3011 provided on the support body 301 is too large, and the density of the protrusions 3011 is too large, which will occupy too much area of ​​the exhaust channel 302, reducing the area of ​​the exhaust channel 302 and affecting the smoothness of the exhaust. In addition, the weight of the support body 301 increases accordingly, which reduces the energy density of the battery. If the distance L between two adjacent protrusions 3011 on the same side of the support body 301 is greater than 200 mm, the number of protrusions 3011 provided on the support body 301 will be too small, resulting in insufficient area of ​​the support body 301 where the support member 3 contacts the electrode group 2, and the electrode group 2 cannot be effectively supported. There is a risk that the electrode group 2 will deform and sink toward the side where the explosion-proof valve 101 is provided, thereby blocking the exhaust passage 302, preventing the gas from being discharged in a timely manner. Therefore, the distance L between two adjacent protrusions 3011 on the same side of the support body 301 is set to a value range of 50 mm to 200 mm, which can ensure both smooth exhaust and sufficient support effect of the support member 3. Preferably, the distance L between two adjacent protrusions 3011 on the same side of the support body 301 is 120 mm.

[0141] In one embodiment, the thickness of the support member 3 is in the range of 0.5 mm to 5 mm. It should be noted that the thickness of the support member 3 refers to the dimension of the support member 3 along the "height direction" indicated by the arrow in FIG5 . The thickness of the support member 3 determines the distance between the electrode group 2 and the housing 102 and directly affects the size of the exhaust space. If the thickness of the support member 3 is less than 0.5 mm, the thickness of the support member 3 is too small, the space between the electrode group 2 and the housing 102 along the height direction is insufficient, the exhaust space of the exhaust channel 302 is insufficient, the resistance encountered during gas discharge is large, the gas cannot be discharged in time, and there is a safety risk. If the thickness of the support member 3 is greater than 5 mm, the thickness of the support member 3 is too large, which will occupy too much space inside the housing 102, reduce the height of the electrode group 2, reduce the energy of the battery, and be detrimental to the improvement of battery performance. Therefore, setting the thickness of the support member 3 to a range of 0.5 mm to 5 mm can ensure sufficient exhaust space, ensure the smoothness of exhaust, and improve the energy density of the battery.

[0142] In one embodiment, the shape of the protrusion 3011 is semicircular or polygonal. Both semicircular and polygonal shapes can achieve the supporting function of the protrusion, and have more choices and are easy to process.

[0143] In one embodiment, the polygonal shape includes one or more of a triangle, a rectangle, and a trapezoid, and the protrusion 3011 is configured in the shape of one or more of a triangle, a rectangle, and a trapezoid. These shapes are simple in structure, easy to process, and low in manufacturing cost. Specifically, when the protrusion 3011 is configured in the shape of one or more of a triangle, a rectangle, and a trapezoid, the corners of the shape are configured as smoothly transitional arcs to reduce stress and improve stability. Of course, the protrusion 3011 can also be configured in the shape of other polygons besides triangles, rectangles, and trapezoids.

[0144] In one embodiment, the support body 301 further includes: at least one limiting portion 303, which is supported between the two side portions of the support body 301 along the width direction of the support body 301. By providing the limiting portion 303, the two side portions of the support body 301 are supported inside the support body 301, thereby preventing the support member 3 from being concavely deformed in the width direction, increasing the overall strength of the support member 3, facilitating the assembly of the support member 3, and ensuring the exhaust effect of the exhaust channel 302. It should be noted that the limiting portion 303 is integrally formed with the support body 301, and can be formed by die cutting or injection molding; at least one limiting portion 303 divides the exhaust channel 302 into at least two areas, each area corresponding to at least one explosion-proof valve 101, and the limiting portion 303 will not block the explosion-proof valve 101, thereby avoiding affecting the opening of the explosion-proof valve 101.

[0145] Specifically, the limiting portion 303 includes a first limiting portion 3031 and a second limiting portion 3032. The first end of the first limiting portion 3031 is connected to one side of the inner ring of the support body 301, and the first end of the second limiting portion 3032 is connected to the other side of the inner ring of the support body 301. The second end of the first limiting portion 3031 and the second end of the second limiting portion 3032 are arranged close to each other. By arranging the first limiting portion 3031 and the second limiting portion 3032 close to each other, the overall supporting effect of the limiting portion 303 on the support body 301 is ensured.

[0146] According to another aspect of an embodiment of the present invention, a battery pack is provided, comprising the above-mentioned battery.

[0147] The following describes an embodiment of the present invention with reference to FIG. 13 to FIG. 24 .

[0148] According to an embodiment of the present invention, in one aspect, a battery is provided, comprising a housing 11, an explosion-proof valve 12, a battery cell 13, and a support member 14. A housing 11 defines a storage space 1101, with the explosion-proof valve 12 disposed on a side of the housing 11. The battery cell 13 is located within the storage space 1101. The support member 14 is disposed within the storage space 1101 and is positioned between the side of the housing 11 on which the explosion-proof valve 12 is disposed and the battery cell 13. The support member 14 comprises an annular body 1401 and a stopper 1402. The stopper 1402 supports the annular body 1401 on both sides of its inner circumference along its width. The annular body 1401 is provided with a plurality of thinning regions 14011 spaced apart circumferentially. The thinning regions 14011 extend along the width of the annular body 1401.

[0149] By setting a support member 14, which is supported between the side of the shell 11 and the battery cell 13, an exhaust space is reserved between the shell 11 and the battery cell 13, reducing the gas transmission resistance, facilitating the rapid discharge of gas inside the battery, and ensuring the safety of the battery; and, by setting a limit portion 1402, the two sides of the annular main body 1401 are supported inside the annular main body 1401, avoiding the support member 14 from being concave and deformed in the width direction, facilitating the assembly of the support member 14, and ensuring the exhaust effect of the center hole 14012 of the annular main body 1401; by setting a thinning area 14011 on the annular main body 1401, when the inside of the battery reaches a predetermined pressure, the annular main body 1401 is torn at the thinning area 14011, so that the gas outside the support member 14 in the accommodating space 1101 enters the center hole 14012 of the annular main body 1401 through the torn thinning area 14011, and is discharged from the explosion-proof valve 12, thereby improving the exhaust efficiency of the gas in the battery.

[0150] It is worth noting that the thinning area 14011 provided on the annular body 1401 refers to reducing the thickness at a predetermined position of the annular body 1401 , thereby forming the thinning area 14011 .

[0151] It should be noted that the gas in the battery passes through the central hole 14012 of the annular body 1401 and is discharged through the explosion-proof valve 12.

[0152] It is worth noting that for batteries with a relatively large length and a relatively small width, such as blade batteries, the support member 14 is arranged on the side of the battery, so that the support member 14 is also a structure with a relatively large length and a relatively small width. If the support member 14 is processed by injection molding, it is not only costly, but also requires segmented injection molding due to process problems, which greatly increases the difficulty of assembly. Therefore, the support member 14 can be die-cut into a "U" shape (that is, a ring-shaped structure), which is low-cost and easy to mold. However, due to the long length of the support member 14, the middle part of the support member 14 in the length direction will be concave inward, making the support member 14 inconvenient to assemble. Therefore, in this embodiment, the annular body 1401 can be supported by providing a limit portion 1402 to avoid deformation.

[0153] In one embodiment, as shown in Figures 18 to 21 , a plurality of thinned areas 14011 are provided on both long and short sides of the annular body 1401. This allows gas within the accommodating space 1101, corresponding to the outer sides of the two long sides and the outer sides of the two short sides of the annular body 1401, to quickly enter the central hole 14012 of the annular body 1401, shortening the gas transmission path and facilitating gas discharge. Specifically, when the thinned areas 14011 are torn, the gas surrounding the battery cell 13 can enter the central hole 14012 of the annular body 1401.

[0154] In one embodiment, as shown in FIG19 , the thinned area 14011 on the long side of the annular body 1401 is arranged corresponding to the position of the explosion-proof valve 12. This shortens the transmission path of the gas to the explosion-proof valve 12, and enables rapid gas discharge.

[0155] In one embodiment, as shown in Figures 20 and 22, two thinned areas 14011 are spaced apart on the short side of annular body 1401. The center-to-center distance between the two thinned areas 14011 is d, and the width of the central hole 14012 of annular body 1401 is c, satisfying d ≥ 0.5 * c. When the two thinned areas 14011 are torn, the portion of annular body 1401 located between the two thinned areas 14011 breaks off, forming an opening at the short side of annular body 1401, which facilitates the entry of gas outside the short side of annular body 1401 into central hole 14012. Furthermore, d ≥ 0.5 * c ensures a wide opening, facilitating the entry of gas into central hole 14012.

[0156] In one embodiment, as shown in FIG22 , the thickness of the support member 14 is h, and the thickness of the thinning area 14011 is e, satisfying 0.05*h≤e≤0.2*h. Setting 0.05*h≤e≤0.2*h ensures that the support member 14 has sufficient strength while also enabling the thinning area 14011 to tear under a predetermined pressure. Specifically, if e<0.05*h, the thinning area 14011 will be too thin, making it difficult to process and manufacture the thinning area 14011 on the annular body 1401, thereby resulting in a low yield rate and high production cost for the support member 14. In addition, if the thinning area 14011 is too thin, the overall structural strength of the support member 14 will be insufficient, and deformation will easily occur at the thinning area 14011, which will be detrimental to the gripping and loading of the loading equipment during the assembly process. If e>0.2*h, the thickness of the thinning area 14011 will be too large, so that the strength of the thinning area 14011 is too high, the thinning area 14011 cannot be torn under the predetermined pressure, and the structural function of the thinning area 14011 fails.

[0157] It should be noted that the explosion-proof valve 12 can be opened when the gas pressure reaches a first preset pressure P1, and the thinning area 14011 can be torn when the gas pressure reaches a second preset pressure P2, and P2 is less than P1.

[0158] In one embodiment, as shown in FIG13 , the battery length L is ≥ 300 mm, and the battery width D is ≤ 30 mm; the battery length L and the battery width D satisfy L / D ≥ 10. Therefore, the support member 14 is used for batteries that are longer and narrower, resulting in the annular body 1401 being longer and narrower. The middle portion of the annular body 1401 along its length is prone to inward deformation. Therefore, the stopper 1402 is provided to provide support to the annular body 1401 and prevent deformation.

[0159] In one embodiment, as shown in FIG24 , the width of the housing 11 is B, and the width of the support member 14 is b, satisfying b≥0.5*B. By making b≥0.5*B, the support member 14 can provide effective support between the battery cell 13 and the housing 11, effectively reducing the gas transmission resistance. Specifically, if b<0.5*B, the effective support area of ​​the support member 14 for the battery cell 13 is insufficient, and the battery cell 13 may have problems such as deflection or electrode slippage caused by unstable support; in addition, the smaller the width b of the support member 14, the greater the pressure on the contact position between the battery cell 13 and the support member 14 when the weight of the battery cell 13 remains unchanged, and the more likely it is to deform, thereby causing the slurry coated on the positive and negative electrodes inside the battery cell 13 to fall off, affecting the capacity and safety of the battery cell 13. Moreover, if b is less than 0.5*B, although the space formed between the two sides of the support member 14 and the inner wall of the outer shell 11 can be used for gas transmission, the area proportion of the central hole 14012 of the support member 14 will be greatly reduced. When the gas is discharged through the central hole 14012 of the support member 14, the resistance is too large, and the gas discharged per unit time is reduced, which is not conducive to the smooth discharge of the gas.

[0160] In one embodiment, as shown in FIG24 , the wall thickness of the side of the shell 11 on which the explosion-proof valve 12 is provided is g, satisfying g ≥ 0.95 mm. G ≥ 0.95 mm ensures the installation strength of the explosion-proof valve 12. It is worth noting that the specific value of the wall thickness g is determined by the current welding manufacturing capacity. Specifically, the thickness of the welding portion of the explosion-proof valve 12 commonly used in the related art is 0.5 mm. If the wall thickness g is less than 0.95 mm, the mounting step hole of the explosion-proof valve 12 is easily deformed during processing, resulting in a low yield rate. In addition, the processing and life requirements of the tool or mold are high, and the processing cost is high. In addition, the welding depth of the explosion-proof valve 12 and the shell 11 requires a high depth of penetration, while the tolerance of the laser welding depth is large. If the wall thickness g is too small, it is easy to cause welding through or unstable welding, affecting the airtightness of the welding position.

[0161] It should be noted that, referring to FIG. 24 , the wall thickness of the surface of the housing 11 where the explosion-proof valve 12 is not installed is s, satisfying s<g.

[0162] In one embodiment, as shown in FIG24 , the thickness of the support member 14 is h, satisfying the condition 0.5 mm ≤ h ≤ 2 mm. Ensuring 0.5 mm ≤ h ≤ 2 mm ensures sufficient support strength for the support member 14 while preventing it from excessively occupying the battery's internal space, thereby improving the battery's energy density. Specifically, if h is less than 0.5 mm, the center hole 14012 of the support member 14 lacks sufficient height space, and the cross-sectional area of ​​the center hole 14012 along the width and height directions is small. This results in significant resistance to gas discharge during discharge, reducing the amount of gas discharged per unit time and preventing timely discharge. This can put the battery cell 13 at risk of bursting and exploding due to gas "expansion." If h is greater than 2 mm, the greater the proportion of the accommodation space 1101 occupied by the support member 14 in the height direction, the shorter the height of the battery cell 13, given a given size of the accommodation space 1101 within the housing 11. This reduces the energy consumption of the individual battery cells 13 and lowers the battery's energy density.

[0163] In one embodiment, as shown in FIG23 , the limiting portion 1402 includes a first sub-portion 14021 and a second sub-portion 14022. The first end of the first sub-portion 14021 is connected to one side of the inner ring of the annular body 1401, and the first end of the second sub-portion 14022 is connected to the other side of the inner ring of the annular body 1401. The second end of the first sub-portion 14021 and the second end of the second sub-portion 14022 are disposed adjacent to each other. The proximity of the first sub-portion 14021 and the second end of the second sub-portion 14022 ensures that the limiting portion 1402 as a whole supports the annular body 1401. A gap is provided between the second end of the first sub-portion 14021 and the second end of the second sub-portion 14022. During exhaust, when the gas reaches a predetermined pressure, the first sub-portion 14021 and the second sub-portion 14022 can be offset and moved in their respective length directions. This allows the central holes 14012 on both sides of the limiting portion 1402 to communicate, allowing the gas to be effectively discharged into the explosion-proof valve 12.

[0164] It is worth noting that when the gas pressure entering the center hole 14012 of the annular body 1401 is relatively high, the gas will exert force on the first division 14021 and the second division 14022, causing the first division 14021 and the second division 14022 to produce an offset movement along the length direction, thereby increasing the distance between the first division 14021 and the second division 14022, so that the center holes 14012 on both sides of the limiting portion 1402 are connected.

[0165] It should be noted that the explosion-proof valve 12 can be opened when the gas pressure reaches a first preset pressure P1, and the first section 14021 and the second section 14022 can be offset when the gas pressure reaches a third preset pressure P3, and P3 is less than P1.

[0166] In one embodiment, the gap between the second end of the first subsection 14021 and the second end of the second subsection 14022 is less than 0.5 mm. Thus, while ensuring that the first subsection 14021 and the second subsection 14022 can generate offset movement under a predetermined pressure, the first subsection 14021 and the second subsection 14022 can also provide support for the annular body 1401.

[0167] It is worth noting that if the distance between the first section 14021 and the second section 14022 is too large, it will be unable to provide effective support to both sides of the annular body 1401, resulting in the annular body 1401 still undergoing significant deformation.

[0168] In one embodiment, as shown in FIG23 , the angle α between the sidewall of the first subsection 14021 and the inner ring of the annular body 1401 is greater than or equal to 120°, and the angle α between the sidewall of the second subsection 14022 and the inner ring of the annular body 1401 is greater than or equal to 120°. This prevents eddy currents from forming at the junctions between the sidewall of the first subsection 14021 and the inner ring of the annular body 1401, and between the sidewall of the second subsection 14022 and the inner ring of the annular body 1401, thereby ensuring a smooth transition of the gas.

[0169] It is worth noting, referring to Figures 19 and 23, if the angle α is less than 120°, when the gas enters the right center hole 14012 from the left center hole 14012 or enters the left center hole 14012 from the right center hole 14012, the limiting portion 1402 (the first division 14021 and the second division 14022) will cause a greater obstruction to the gas, causing the gas to generate vortexes at the angle, affecting the circulation of the gas.

[0170] In one embodiment, as shown in FIG23 , the sidewall of first subsection 14021 is transitionally connected to the second end of first subsection 14021 via an arcuate structure, and the sidewall of second subsection 14022 is transitionally connected to the second end of second subsection 14022 via an arcuate structure. Thus, the gas blocking effect of first subsection 14021 and second subsection 14022 is reduced, allowing gas to flow smoothly between central holes 14012 on both sides of limiting portion 1402.

[0171] In one embodiment, as shown in Figures 18 and 19, there is one limiting portion 1402, which is disposed at the middle position along the length direction of the annular body 1401. That is, there is one first sub-portion 14021 and one second sub-portion 14022, with the first sub-portion 14021 disposed at the middle position on one side of the inner circle of the annular body 1401, and the second sub-portion 14022 disposed at the middle position on the other side of the inner circle of the annular body 1401, so that the first sub-portion 14021 and the second sub-portion 14022 are disposed opposite each other.

[0172] Of course, in other alternative embodiments, a plurality of limiting portions 1402 may be provided, and the plurality of limiting portions 1402 are spaced apart along the length direction of the annular body 1401. While ensuring the exhaust space of the central hole 14012 of the annular body 1401, the limiting portions 1402 can also provide support for the annular body 1401.

[0173] It is worth noting that one limiting portion 1402 or several limiting portions 1402 are provided corresponding to the weak positions of the annular body 1401 , thereby playing a supporting role.

[0174] In one embodiment, referring to FIG. 19 and FIG. 23 , the first sub-portion 14021 and the second sub-portion 14022 are symmetrically arranged along the transverse center line of the annular body 1401 .

[0175] 13 to 19 , the center hole 14012 of the annular body 1401 corresponds to the explosion-proof valve 12. Therefore, the gas in the battery can directly reach the explosion-proof valve 12 after passing through the center hole 14012 of the annular body 1401, facilitating gas discharge.

[0176] In one embodiment, as shown in Figures 18 to 21 , the support member 14 further includes a protrusion 1403, which is connected to the inner wall of the annular body 1401 and extends toward the central hole 14012 of the annular body 1401. While ensuring the exhaust space of the central hole 14012 of the annular body 1401, the support area of ​​the support member 14 between the housing 11 and the battery cell 13 is increased.

[0177] It is worth noting that when the support area of ​​the support member 14 is too small, the support strength of the support member 14 is insufficient, and a stable exhaust space cannot be formed between the housing 11 and the battery cell 13. However, if the support area of ​​the support member 14 is increased, that is, the ring width of the annular body 1401 is increased, the area of ​​the center hole 14012 will be reduced as a whole, which is not conducive to exhaust. Therefore, in this embodiment, a plurality of protrusions 1403 are sequentially arranged at intervals along the length direction of the inner ring of the annular body 1401 to increase the support area, and the area of ​​the center hole 14012 will not be reduced as a whole, thereby ensuring the exhaust effect. Further, referring to Figure 19, the plurality of protrusions 1403 located on one side of the inner ring of the annular body 1401 are staggered with the plurality of protrusions 1403 located on the other side of the inner ring of the annular body 1401, thereby avoiding the obstruction of gas caused by the relative arrangement of the two protrusions 1403.

[0178] It should be noted that the shape of the protrusion 1403 can be semicircular, rectangular, trapezoidal, triangular, etc.

[0179] In one embodiment, the total area of ​​the side of the support member 14 facing the explosion-proof valve 12 is S, and the sum of the areas of the sides of the annular body 1401 and the protrusion 1403 facing the explosion-proof valve 12 is S1, satisfying 0.2≤S1 / S≤0.8. This ensures that 0.2≤S1 / S≤0.8 ensures sufficient support area for the support member 14 while also allowing gas to flow smoothly through the center hole 14012. Specifically, S is the total area of ​​the large surface of the support member 14, including the area occupied by the center hole 14012; S1 is the effective support area of ​​the support member 14, i.e., the area that supports the connection between the housing 11 and the battery cell 13. If S1 / S is less than 0.2, the effective support area is too small, resulting in unstable support of the battery cell 13, causing deflection or electrode slippage. If S1 / S is greater than 0.8, the area of ​​the center hole 14012 is too small, hindering smooth gas flow.

[0180] In one embodiment, as shown in FIG21 , the width of the support member 14 is b, and the spacing between the two protrusions 1403 along the width of the support member 14 is f, satisfying f ≥ 0.25*b. Ensuring f ≥ 0.25*b ensures smooth gas flow along the length of the central hole 14012.

[0181] In one embodiment, as shown in FIG16 , two explosion-proof valves 12 are provided at intervals, with the center distance between the two explosion-proof valves 12 being y and the length of the battery being L, satisfying 1 / 3 ≤ y / L ≤ 1 / 2. This condition ensures that gas at all locations within the accommodation space 1101 can reach the explosion-proof valves 12 via a relatively short transmission path.

[0182] It is worth noting that the two explosion-proof valves 12 are respectively provided corresponding to the two central holes 14012 located on both sides of the limiting portion 1402 .

[0183] Of course, in other alternative embodiments, the explosion-proof valves 12 may also be provided in other quantities, such as one, three, four, etc. The quantity of the explosion-proof valves 12 may be specifically set according to design requirements.

[0184] It should be noted that when one or more explosion-proof valves 12 are provided, the thinned area 14011 on the long side of the annular body 1401 needs to be provided corresponding to the position of the explosion-proof valve 12 .

[0185] In one embodiment, as shown in FIG13 , the housing 11 is a closed structure, thereby enclosing a receiving space 1101. Specifically, the housing 11 includes a shell 1102 and a cover 1103. The shell 1102 is open at both ends, and two cover plates 1103 are provided, which respectively close the two openings at both ends of the shell 1102.

[0186] Of course, in other alternative embodiments, one end of the shell 1102 is open, and the other end of the shell 1102 is closed, and a cover plate 1103 is provided, and a cover plate 1103 is closed at the opening at one end of the shell 1102.

[0187] It should be noted that the cover plate 1103 is electrically connected to the battery cell 13 .

[0188] In one embodiment, as shown in FIG. 14 , the housing 11 further includes an insulating protective film 1104 . The insulating protective film 1104 is disposed between the inner surface of the housing 1102 and the side surface of the battery cell 13 to insulate the battery cell 13 from the housing 1102 .

[0189] It is worth noting that, referring to FIG. 14 , the insulating protection film 1104 is disposed outside the support member 14 .

[0190] It should be further explained that when the battery needs to be vented, the battery is in a high temperature and high pressure state. At this time, the provision of the insulating protective film 1104 will not affect the emission of gas.

[0191] According to another aspect of an embodiment of the present invention, a battery pack is provided, comprising the above-mentioned battery.

[0192] The following describes an embodiment of the present invention with reference to FIG. 25 to FIG. 29 .

[0193] According to an embodiment of the present invention, in one aspect, a battery is provided, comprising a housing 11, an explosion-proof valve 22, an electrode group 23, and a support member 24. A housing 11 defines a receiving space 1101. The explosion-proof valve 22 is disposed on a side of the housing 11, and the electrode group 23 is located within the receiving space 1101. The support member 24 is disposed within the receiving space 1101, positioned between the side of the housing 11 where the explosion-proof valve 22 is disposed and the electrode group 23. The support member 24 comprises an annular body 2401 and a stopper 2402. The stopper 2402 supports the inner ring of the annular body 2401 along its width.

[0194] By providing a support member 24, which is supported between the side of the outer shell 11 and the pole group 23, an exhaust space is reserved between the outer shell 11 and the pole group 23, thereby reducing the gas transmission resistance, facilitating the rapid discharge of gas inside the battery, and ensuring the safety of the battery; and, by providing a limiting portion 2402, the two sides of the annular main body 2401 are supported inside the annular main body 2401, avoiding the support member 24 from being concave and deformed in the width direction, facilitating the assembly of the support member 24, and ensuring the exhaust effect of the center hole 24011 of the annular main body 2401.

[0195] It should be noted that the gas in the battery passes through the central hole 24011 of the annular body 2401 and is discharged through the explosion-proof valve 22.

[0196] It is worth noting that for batteries with a relatively large length and a relatively small width, such as blade batteries, the support member 24 is arranged on the side of the battery, so that the support member 24 is also a structure with a relatively large length and a relatively small width. If the support member 24 is processed by injection molding, it is not only costly, but also requires segmented injection molding due to process problems, which greatly increases the difficulty of assembly. Therefore, the support member 24 can be die-cut into a "U" shape (that is, a ring-shaped structure), which is low-cost and easy to mold. However, due to the long length of the support member 24, the middle part of the support member 24 in the length direction will be concave inward, making the support member 24 inconvenient to assemble. Therefore, in this embodiment, the annular body 2401 can be supported by providing a limit portion 2402 to avoid deformation.

[0197] In one embodiment, as shown in Figures 27 to 29, the limiting portion 2402 includes a first division 24021 and a second division 24022, the first end of the first division 24021 is connected to one side of the inner ring of the annular body 2401, the first end of the second division 24022 is connected to the other side of the inner ring of the annular body 2401, and the second end of the first division 24021 and the second end of the second division 24022 are arranged close to each other.

[0198] By arranging the first section 24021 and the second section 24022 close to each other, the overall supporting effect of the limiting section 2402 on the annular main body 2401 is ensured; there is a gap between the second end of the first section 24021 and the second end of the second section 24022. During the exhaust process, when the gas reaches a higher pressure, the first section 24021 and the second section 24022 can be offset and moved respectively along the length direction, so that the center holes 24011 located on both sides of the limiting section 2402 can be connected, so that the gas can be effectively discharged to the explosion-proof valve 22.

[0199] It is worth noting that when the gas pressure entering the center hole 24011 of the annular body 2401 is relatively high, the gas will exert force on the first division 24021 and the second division 24022, causing the first division 24021 and the second division 24022 to produce an offset movement along the length direction, thereby increasing the distance between the first division 24021 and the second division 24022, so that the center holes 24011 on both sides of the limiting portion 2402 are connected.

[0200] It should be noted that the explosion-proof valve 22 can be opened when the gas pressure reaches a first preset pressure P1, and the first section 24021 and the second section 24022 can be offset when the gas pressure reaches a second preset pressure P2, and P2 is less than P1.

[0201] In one embodiment, the gap between the second end of the first subsection 24021 and the second end of the second subsection 24022 is less than 0.5 mm. Thus, while ensuring that the first subsection 24021 and the second subsection 24022 can generate offset movement under a predetermined pressure, the first subsection 24021 and the second subsection 24022 can also provide support for the annular body 2401.

[0202] It is worth noting that if the distance between the first section 24021 and the second section 24022 is too large, it will be unable to provide effective support to both sides of the annular body 2401, resulting in the annular body 2401 still undergoing significant deformation.

[0203] In one embodiment, as shown in FIG29 , the angle α between the sidewall of the first subsection 24021 and the inner ring of the annular body 2401 is greater than or equal to 120°, and the angle α between the sidewall of the second subsection 24022 and the inner ring of the annular body 2401 is greater than or equal to 120°. This prevents eddy currents from forming at the junctions between the sidewall of the first subsection 24021 and the inner ring of the annular body 2401, and between the sidewall of the second subsection 24022 and the inner ring of the annular body 2401, thereby ensuring a smooth transition of the gas.

[0204] It is worth noting, referring to Figures 28 and 29, if the angle α is less than 120°, when the gas enters the right center hole 24011 from the left center hole 24011 or enters the left center hole 24011 from the right center hole 24011, the limiting portion 2402 (the first division 24021 and the second division 24022) will cause a greater obstruction to the gas, causing the gas to generate vortexes at the angle, affecting the circulation of the gas.

[0205] In one embodiment, as shown in FIG29 , the sidewall of the first subsection 24021 is transitionally connected to the second end of the first subsection 24021 via an arcuate structure, and the sidewall of the second subsection 24022 is transitionally connected to the second end of the second subsection 24022 via an arcuate structure. Thus, the gas blocking effect of the first subsection 24021 and the second subsection 24022 is reduced, allowing gas to flow smoothly between the central holes 24011 on both sides of the limiting portion 2402.

[0206] In one embodiment, as shown in Figures 27 and 28, there is one limiting portion 2402, which is disposed at the middle position along the length direction of the annular body 2401. That is, there is one first sub-portion 24021 and one second sub-portion 24022, with the first sub-portion 24021 disposed at the middle position on one side of the inner ring of the annular body 2401, and the second sub-portion 24022 disposed at the middle position on the other side of the inner ring of the annular body 2401, so that the first sub-portion 24021 and the second sub-portion 24022 are disposed opposite each other.

[0207] Of course, in other alternative embodiments, a plurality of limiting portions 2402 may be provided, and the plurality of limiting portions 2402 are spaced apart along the length direction of the annular body 2401. While ensuring the exhaust space of the central hole 24011 of the annular body 2401, the limiting portions 2402 can also provide support for the annular body 2401.

[0208] It is worth noting that one limiting portion 2402 or several limiting portions 2402 are provided corresponding to the weak positions of the annular body 2401 , thereby playing a supporting role.

[0209] In one embodiment, referring to FIG. 28 and FIG. 29 , the first sub-portion 24021 and the second sub-portion 24022 are symmetrically arranged along the transverse center line of the annular body 2401 .

[0210] In one embodiment, the battery length L is greater than or equal to 300 mm, and the battery width D is less than or equal to 30 mm. Therefore, the support member 24 is used for batteries that are longer and narrower, resulting in the annular body 2401 being longer and narrower. The middle portion of the annular body 2401 along its length is prone to inward deformation. Therefore, the stopper 2402 is provided to provide support for the annular body 2401 and prevent deformation.

[0211] In one embodiment, referring to Figures 13, 25, 15, and 26, the center hole 24011 of the annular body 2401 is disposed corresponding to the explosion-proof valve 22. Therefore, the gas in the battery can directly reach the explosion-proof valve 22 after passing through the center hole 24011 of the annular body 2401, facilitating gas discharge.

[0212] In one embodiment, as shown in Figures 27 and 28, the support member 24 further includes a protrusion 2403, which is connected to the inner wall of the annular body 2401 and extends toward the central hole 24011 of the annular body 2401. While ensuring the exhaust space of the central hole 24011 of the annular body 2401, the support area of ​​the support member 24 between the housing 11 and the electrode group 23 is increased.

[0213] It is worth noting that when the support area of ​​the support member 24 is too small, the support strength of the support member 24 is insufficient, and a stable exhaust space cannot be formed between the housing 11 and the electrode group 23. However, if the support area of ​​the support member 24 is increased, that is, the ring width of the annular body 2401 is increased, the area of ​​the center hole 24011 will be reduced as a whole, which is not conducive to exhaust. Therefore, in this embodiment, a plurality of protrusions 2403 are sequentially arranged at intervals along the length direction of the inner ring of the annular body 2401 to increase the support area, and the area of ​​the center hole 24011 will not be reduced as a whole, thereby ensuring the exhaust effect. Further, referring to Figure 28, the plurality of protrusions 2403 located on one side of the inner ring of the annular body 2401 are staggered with the plurality of protrusions 2403 located on the other side of the inner ring of the annular body 2401, thereby avoiding the obstruction of gas caused by the relative arrangement of the two protrusions 2403.

[0214] In one embodiment, as shown in FIG13 , FIG25 and FIG15 , two explosion-proof valves 22 are provided. The two explosion-proof valves 22 are respectively provided corresponding to the two central holes 24011 located on both sides of the limiting portion 2402 .

[0215] Of course, in other alternative embodiments, the explosion-proof valves 22 may also be provided in other numbers, such as one, three, four, etc. The number of explosion-proof valves 22 may be specifically set according to design requirements.

[0216] In one embodiment, as shown in FIG13 , the housing 11 is a closed structure, thereby enclosing a receiving space 1101. Specifically, the housing 11 includes a shell 2102 and a cover 2103. The shell 2102 is open at both ends, and two cover 2103 are provided, respectively closing the two openings at both ends of the shell 2102.

[0217] Of course, in other alternative embodiments, one end of the shell 2102 is open, and the other end of the shell 2102 is closed, and a cover plate 2103 is provided, and a cover plate 2103 is closed at the opening at one end of the shell 2102.

[0218] It should be noted that the cover plate 2103 is electrically connected to the electrode group 23 .

[0219] In one embodiment, as shown in FIG. 25 , the housing 11 further includes an insulating protective film 2104 , which is disposed between the inner surface of the housing 2102 and the side surface of the pole group 23 to insulate the pole group 23 from the housing 2102 .

[0220] It is worth noting that, referring to FIG. 25 , the insulating protective film 2104 is disposed on the outside of the support member 24 .

[0221] It should be further explained that when the battery needs to be vented, the battery is in a high temperature and high pressure state. At this time, the provision of the insulating protective film 2104 will not affect the emission of gas.

[0222] According to another aspect of an embodiment of the present invention, a battery pack is provided, comprising the above-mentioned battery.

[0223] The following describes an embodiment of the present invention in conjunction with Figures 1, 2, 4, 12 and 30 to 39.

[0224] According to an embodiment of the present invention, in one aspect, a battery is provided, comprising: a housing 1, an electrode group 32, and a support member 33. A housing 1 defines an interior housing cavity, a side of which is provided with an explosion-proof valve 3101, adapted to open at a first preset pressure value; the electrode group 32 is disposed within the housing cavity; and the support member 33 is positioned between the side of the housing 1 provided with the explosion-proof valve 3101 and the electrode group 32. The support member 33 is configured with at least one fracture zone 3303, at least a portion of which is configured as a thinned portion 33031, the thickness of the thinned portion 33031 being less than the thickness of the main portion of the support member 33. The thinned portion 33031 is adapted to fracture at a second preset pressure value, thereby providing communication between the housing cavity and the explosion-proof valve 3101, wherein the second preset pressure value is less than the first preset pressure value.

[0225] The battery using this embodiment is provided with a support member 33 between the outer shell 1 and the electrode group 32. The support member 33 is located in the accommodating cavity of the outer shell 1. One side of the support member 33 abuts the inner wall of the side of the outer shell 1 where the explosion-proof valve 3101 is provided, and the other side abuts the electrode group 32. The support member 33 plays a supporting role between the electrode group 32 and the outer shell 1, so that there is a certain distance between the electrode group 32 and the outer shell 1. At the same time, by constructing a fracture zone 3303 on the support member 33, the thinned portion 33031 of the fracture zone 3303 breaks before the explosion-proof valve 3101 is opened, thereby connecting the explosion-proof valve 3101 with the accommodating cavity where the electrode group 32 is provided, increasing the exhaust space, and facilitating that the gas in the accommodating cavity can be discharged to the position of the explosion-proof valve 3101 in a timely manner, thereby ensuring that the gas in the battery can be discharged through the explosion-proof valve 3101 in a timely manner, thereby ensuring the safety of the battery.

[0226] It should be noted that the side of the shell 1 refers to the surface of the shell 1 extending along the "length direction" indicated by the arrow in Figure 1, preferably one of the narrower side surfaces; the first preset pressure value is the critical pressure value for opening the explosion-proof valve 3101, and the second pressure value is the critical pressure value for breaking the thinning portion 33031. The second pressure value is slightly smaller than the first pressure value. The second pressure value is smaller than the first pressure value to ensure that the fracture zone 3303 breaks before the explosion-proof valve 3101 is opened; the projection of the fracture zone 3303 on the side of the shell 1 covers the explosion-proof valve 3101. When the gas pressure inside the battery is too high, the explosion-proof valve 3101 is high. The high-pressure gas breaks through, and the explosion-proof valve 3101 can discharge the gas in the battery after opening; the thickness of the thinning portion 33031 is less than the thickness of the main part of the support member 33, which means that the thickness of the thinning portion 33031 is less than the thickness of the solid part of the support member 33 except the thinning portion 33031, the thickness of the thinning portion 33031 is small, the strength of the thinning portion 33031 is less than the part other than the thinning portion 33031, and the thinning portion 33031 can break first; wherein, the thickness refers to the dimension along the "thickness direction" indicated by the arrow in Figure 38, and is also the dimension in the "height direction" indicated by the arrow in Figure 30.

[0227] Specifically, the number of explosion-proof valves 3101 can be one or more, and the specific number can be set according to design requirements.

[0228] In one embodiment, the thickness of the thinning portion 33031 is H1, and the thickness of the main portion of the support member 33 is H, wherein 0.05≤H1 / H≤0.5. Further in conjunction with FIG38 , the smaller the thickness of the thinning portion 33031, the smaller its strength. If H1 / H is less than 0.05, the thickness of the thinning portion 33031 is too small, making it difficult to manufacture, and the structural strength of the entire support member 33 is insufficient, and it is easy to deform at the thinning portion 33031. If H1 / H is greater than 0.5, the thickness of the thinning portion 33031 is too large, the strength of the thinning portion 33031 is too high, the thinning portion 33031 cannot be destroyed under the second preset pressure, and the fracture zone 3303 cannot be broken. If the thinning portion 33031 is broken in time, the structural function will fail, and the gas in the accommodating cavity cannot be discharged to the explosion-proof valve 3101 in time, which reduces the safety of the battery. Therefore, the ratio of the thickness H1 of the thinning portion 33031 to the thickness H of the main part of the support member 33 is set between 0.05 and 0.5. This can ensure that the support member 33 has sufficient strength to avoid deformation at the thinning portion 33031, and can also avoid excessive strength of the thinning portion 33031 to ensure that the thinning portion 33031 can break in time.

[0229] In one embodiment, each fracture zone 3303 comprises at least two spaced-apart thinning portions 33031. By providing at least two spaced-apart thinning portions 33031, after a thinning portion 33031 breaks, the area between the at least two thinning portions 33031 can be completely separated from the support member 33, thereby forming a larger fracture zone 3303. This increases the gas flow space and facilitates the timely discharge of gas from the containment chamber to the explosion-proof valve 3101. Furthermore, the spaced-apart arrangement of at least two thinning portions 33031 reduces the size of each thinning portion 33031, thereby avoiding the problem of insufficient strength of the support body 3301 caused by a single oversized thinning portion 33031, thereby improving structural stability. Preferably, there are two thinning portions 33031 in each fracture zone 3303 for ease of processing.

[0230] In addition, in other embodiments, each fracture zone 3303 may have only one thinning portion 33031, the thinning portion 33031 may be set to a larger size, or even the entire fracture zone 3303 may be set to be the thinning portion 33031. After the thinning portion 33031 is broken, the entire area where the thinning portion 33031 is located serves as a gas channel to guide the gas in the accommodating chamber to the explosion-proof valve 3101.

[0231] In one embodiment, the support member 33 includes a ring-shaped support body 3301 and an exhaust channel 3302 surrounded by the support body 3301. The fracture zone 3303 is set on the support body 3301. The thinning portion 33031 is connected between the inner ring and the outer ring of the support body 3301. The thickness of the thinning portion 33031 is less than the thickness of the support body 3301. After the thinning portion 33031 is broken, it connects the outer periphery of the support member 33 and the exhaust channel 3302. The support body 3301 plays a supporting role between the electrode group 32 and the outer shell 1, ensuring that there is a certain distance between the electrode group 32 and the outer shell 1. At the same time, the exhaust channel 3302 connects the space where the electrode group 32 is located with the explosion-proof valve 3101, which facilitates the flow of gas in the accommodating chamber, increases the exhaust area, and ensures that the gas at the position of the electrode group 32 in the accommodating chamber can be discharged to the position of the explosion-proof valve 3101 through the exhaust channel 3302 in time. Moreover, after the thinning portion 33031 breaks before the explosion-proof valve 3101 is opened, it can connect the space outside the support member 33 with the exhaust channel 3302, ensuring that the gas outside the support member 33 can enter the exhaust channel 3302 in time, and then be discharged from the exhaust channel 3302 to the position of the explosion-proof valve 3101, thereby ensuring that the gas at any position in the battery can be discharged through the explosion-proof valve 3101 in time, thereby ensuring the safety of the battery. It should be noted that the support body 3301 is the main part of the support member 33; the support body 3301 is annular, the inner circle of the support body 3301 refers to the circle of the ring close to its center, the outer circle refers to the circle of the ring away from its center, and the outer periphery of the support member 33 refers to the space of the outer circle of the ring facing away from the center of the ring; the projection of the exhaust channel 3302 on the side of the outer shell 1 covers the explosion-proof valve 3101.

[0232] In addition, in other embodiments, the support member 33 only includes a support body 3301, the support member 33 is a long strip of support plate, the fracture zone 3303 is arranged on the plate-shaped support body 3301, and the thinning portion 33031 is connected between the two longer sides of the support member 33. When the thinning portion 33031 is broken, the gap formed can connect the area where the pole group 32 is located with the explosion-proof valve 3101, and can also achieve the purpose of guiding the gas in the accommodating cavity to the explosion-proof valve 3101, thereby discharging it out of the battery through the explosion-proof valve 3101 to ensure the safety of the battery.

[0233] In one embodiment, the support member 33 is in a "hui" shape. The support body 3301 has two first side portions 33011 located at both ends in the length direction of the support member 33 and two second side portions 33012 located at both ends in the width direction of the support member 33. Herein, the length direction refers to the "length direction" indicated by the arrow in FIG. 34, and the width direction refers to the "width direction" indicated by the arrow in FIG. 34. The shape of the support member 33 is adapted to the side of the outer shell 1 where the explosion-proof valve 3101 is provided. The "hui" shape structure is convenient for processing and can be adapted to the space inside the outer shell 1. Specifically, the support member 33 can be formed by die-cutting, with low cost and convenient forming.

[0234] In one embodiment, a fracture zone 3303 is provided on each first side portion 33011. The fracture zone 3303 has two thinning portions 33031 arranged at intervals. The distance between the two thinning portions 33031 is L1, and the dimension of the exhaust passage 3302 in the width direction is L. Herein, 0.2 ≤ L1 / L ≤ 1. Further, as shown in FIG. 35, the distance L1 between the two thinning portions 33031 refers to the center distance between the two thinning portions 3 = 3031, and the dimension L of the exhaust passage 3302 in the width direction is the distance between the two second side portions 33012. After the thinning portions 33031 are fractured, the portion between the two thinning portions 33031 as a whole falls off from the support body 3301 to form a channel for guiding gas. The distance L1 between the two thinning portions 33031 will not exceed the dimension L of the exhaust passage 3302 in the width direction at most. If L1 / L is less than 0.2, the distance between the two thinning portions 33031 is too small, which will cause the cross-sectional area of the channel for guiding gas to be insufficient, and the resistance for the gas outside the support member 33 to enter the exhaust passage 3302 is large, which is not conducive to gas discharge. Therefore, setting the ratio range between the distance L1 between the two thinning portions 33031 and the dimension L of the exhaust passage 3302 in the width direction within 0.2 - 1 can ensure that after the thinning portions 33031 are damaged, the cross-sectional area of the channel for guiding gas formed by the fracture zone 3303 is large enough to ensure that the gas around the support member 33 can smoothly enter the exhaust passage 3302.

[0235] In one embodiment, the support member 33 has an explosion-proof corresponding area 3304 corresponding to the explosion-proof valve 3101, and a fracture area 3303 is provided on the second side portion 33012 located in the explosion-proof corresponding area 3304. The fracture area 3303 has at least two thinning portions 33031 arranged at intervals. It should be noted that the explosion-proof corresponding area 3304 includes two second side portions 33012, each of which is provided with a fracture zone 3303. By providing the explosion-proof corresponding area 3304 corresponding to the explosion-proof valve 3101 on the support member 33 and providing the fracture zone 3303 on the second side portion 33012 located in the explosion-proof corresponding area 3304, when the thinning portion 33031 in the fracture zone 3303 is broken, the gas channel formed in the fracture zone 3303 can directly guide the gas around the support member 33 to the position corresponding to the explosion-proof valve 3101, thereby reducing the gas diversion distance, thereby quickly discharging the gas around the support member 33, and further improving the safety of the battery. Specifically, each explosion-proof valve 3101 corresponds to one explosion-proof corresponding area 3304, and there can be multiple fracture zones 3303 within the explosion-proof corresponding area 3304, and the arrangement is not required.

[0236] In one embodiment, the distance between two adjacent thinning portions 33031 on the second side portion 33012 is L2, and the dimension of the explosion-proof valve 3101 along the length direction of the support member 33 is L3, wherein 0.1≤L2 / L3≤1.2. Further in conjunction with Figures 34, 36 and 39, the distance L2 between two adjacent thinning portions 33031 in the explosion-proof corresponding area 3304 is close to the length L3 of the explosion-proof valve 3101. If the ratio of L2 to L3 is less than 0.1, the distance between the two adjacent thinning portions 33031 is too small. When the thinning portion 33031 is destroyed, the air intake cross-sectional area formed in the fracture zone 3303 is insufficient, resulting in a large resistance for the gas outside the support member 33 to enter the exhaust channel 3302, which is not conducive to gas discharge. If the ratio of L2 to L3 is greater than 1.2, sufficient air intake area can be guaranteed. However, the area of ​​the broken zone 3303 that has fallen off is large, and the remaining support part of the supporting body 3301 for the electrode group 32 is reduced, and it cannot effectively support the electrode group 32. The electrode group 32 sinks, and there is a risk of exhaust channel 3302. Therefore, the ratio range between the distance L2 between the two adjacent thinning parts 33031 on the second side 33012 and the length L3 of the explosion-proof valve 3101 is set to be between 0.1-1.2, which can not only ensure that sufficient exhaust area can be formed after the broken zone 3303 is broken, but also ensure that the supporting body 3301 effectively supports the electrode group 32.

[0237] In one embodiment, a plurality of protrusions 33013 extending toward the exhaust passage 3302 are configured on the second side portion 33012 of the support body 3301. The protrusions 33013 on each second side portion 33012 are spaced apart along the length of the support member 33. Providing the protrusions 33013 on the second side portion 33012 increases the area of ​​the support body 3301, ensuring that the support member 33 has good support performance. Furthermore, the relatively small size of the protrusions 33013 minimizes obstruction to exhaust flow through the exhaust passage 3302, allowing the support member 33 to simultaneously meet both support and exhaust requirements, thereby preventing extrusion and deformation of the electrode assembly 32 while ensuring smooth exhaust flow.

[0238] In one embodiment, the protrusions 33013 on different sides are staggered. It should be noted that the "different sides" refer to the two second side portions 33012 that are oppositely disposed along the width direction of the support member 33. By staggering the protrusions 33013 on the two opposite second side portions 33012, the two protrusions 33013 are prevented from being directly opposite each other, thereby providing more sufficient exhaust space, reducing gas flow resistance, and making exhaust smoother. In addition, compared with a structure in which the two protrusions 33013 are directly opposite each other, the staggered distribution of the protrusions 33013 can appropriately increase the size of the protrusions 33013 along the width direction without affecting the smoothness of exhaust. At the same time, it also increases the support area, making the support member 33 more effective in supporting the electrode group 32.

[0239] In one embodiment, the thickness of the support member 33 ranges from 0.5 mm to 5 mm. It should be noted that the thickness of the support member 33 refers to the dimension of the support member 33 along the "height direction" indicated by the arrow in FIG30. The thickness of the support member 33 determines the distance between the electrode group 32 and the housing 3102, which directly affects the size of the exhaust space. If the thickness of the support member 33 is less than 0.5 mm, the thickness of the support member 33 is too small, the space between the electrode group 32 and the housing 3102 along the height direction is insufficient, the exhaust space of the exhaust channel 3302 is insufficient, the resistance encountered during gas exhaust is large, the gas cannot be discharged in time, and there is a safety risk. If the thickness of the support member 33 is greater than 5 mm, the thickness of the support member 33 is too large, which will occupy too much space inside the housing 3102, reduce the height of the electrode group 32, reduce the energy of the battery, and is not conducive to improving the battery performance. Therefore, setting the thickness of the support member 33 to a range of 0.5 mm to 5 mm can ensure sufficient exhaust space, ensure the smoothness of exhaust, and improve the energy density of the battery.

[0240] In one embodiment, the protrusion 33013 is shaped as one or more of a semicircle, a triangle, a rectangle, or a trapezoid. These shapes are simple, easy to process, and low in manufacturing cost. Specifically, when the protrusion 33013 is shaped as one or more of a triangle, a rectangle, or a trapezoid, the corners are configured as smoothly transitioning arcs to reduce stress and improve stability.

[0241] In one embodiment, the support body 3301 further includes: at least one limiting portion 3305, which is supported between the two second side portions 33012. By providing the limiting portion 3305 within the support body 3301 to support the two second side portions 33012 of the support body 3301, the support member 33 is prevented from being deformed in the width direction, the overall strength of the support member 33 is increased, the assembly of the support member 33 is facilitated, and the exhaust efficiency of the exhaust channel 3302 is ensured. It should be noted that the limiting portion 3305 is integrally formed with the support body 3301, and may be formed by die cutting. The at least one limiting portion 3305 divides the exhaust channel 3302 into at least two areas, each area corresponding to at least one explosion-proof valve 3101. The limiting portion 3305 does not block the explosion-proof valve 3101, thereby preventing it from affecting its opening.

[0242] Specifically, the limiting portion 3305 includes a first limiting portion 33051 and a second limiting portion 33052. The first end of the first limiting portion 33051 is connected to one side of the inner ring of the support body 3301, and the first end of the second limiting portion 33052 is connected to the other side of the inner ring of the support body 3301. The second end of the first limiting portion 33051 and the second end of the second limiting portion 33052 are arranged close to each other to ensure the overall supporting effect of the limiting portion 3305 on the support body 3301.

[0243] In one embodiment, the housing 1 is a closed structure, thereby enclosing a housing cavity. Specifically, the housing 1 includes a shell 3102 and a cover plate 3103. The shell 3102 is open at both ends. Two cover plates 3103 are provided, respectively closing the two openings at both ends of the shell 3102. The cover plates 3103 are electrically connected to the electrode group 32.

[0244] In addition, in other embodiments, one end of the shell 3102 is open, and the other end of the shell 3102 is closed, and a cover plate 3103 is provided, and the cover plate 3103 is closed at the opening at one end of the shell 3102.

[0245] In one embodiment, further in conjunction with Figures 31 and 12 , the housing 1 further includes an insulating protective film 3104, which is disposed between the inner surface of the housing 3102 and the electrode group 32 to insulate the electrode group 32 from the housing 3102. Specifically, the insulating protective film 3104 is disposed on the outside of the support member 33, that is, the support member 33 is located between the insulating protective film 3104 and the electrode group 32. When the battery needs to be vented, the battery is in a high temperature and high pressure state, and the provision of the insulating protective film 3104 will not affect the discharge of gas.

[0246] According to another aspect of an embodiment of the present invention, a battery pack is provided, comprising the above-mentioned battery.

[0247] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery, characterized in that: include: A housing is formed with a receiving cavity inside, and an explosion-proof valve is arranged on the side of the housing, and the explosion-proof valve is suitable for opening at a preset pressure value; A pole group, arranged in the accommodating cavity; A support member is located between the side of the shell where the explosion-proof valve is provided and the pole group, the support member includes an annular support body and an exhaust channel surrounded by the support body, the exhaust channel covers the explosion-proof valve, and the support body is provided with a plurality of protrusions extending toward the exhaust channel on both sides along the width direction, and the plurality of protrusions on the same side are spaced apart along the length direction of the support member.

2. The battery according to claim 1, characterized in that The protrusions on different sides are distributed alternately.

3. The battery according to claim 1, characterized in that The total area of ​​the support member is S, and the area of ​​the support body is S1, wherein 0.3≤S1 / S≤0.

7.

4. The battery according to claim 1, characterized in that The dimension of the support member along its width direction is b, and the distance between two protrusions located on different sides of the support body along the width direction is e, wherein e≥0.1b.

5. The battery according to claim 3, characterized in that A dimension d of the side portion of the support body along the width direction and a dimension b of the support member along the width direction satisfy the following: 0.1≤d / b≤0.

2.

6. The battery according to claim 1, characterized in that The distance L between two adjacent protrusions on the same side of the support body ranges from 50 mm to 200 mm.

7. The battery according to any one of claims 1 to 6, characterized in that The thickness of the support member ranges from 0.5 mm to 5 mm.

8. The battery according to any one of claims 1 to 6, characterized in that The protrusion is configured in a semicircular or polygonal shape.

9. The battery according to claim 8, characterized in that The polygon includes one or more of a triangle, a rectangle, and a trapezoid.

10. A battery pack, characterized in that: include: The battery according to any one of claims 1 to 9.

11. A battery, characterized in that: include: The outer shell forms a receiving space inside; An explosion-proof valve, arranged on a side of the housing; A battery cell, located in the accommodation space; A support member is arranged in the accommodating space, and the support member is located between the side of the shell where the explosion-proof valve is arranged and the battery core; the support member includes an annular body and a limiting portion, and the limiting portion is supported on both sides of the inner circle of the annular body along the width direction of the annular body; a thinning area is arranged on the annular body, and a plurality of thinning areas are arranged at intervals along the circumference of the annular body, and the thinning area extends along the width direction of the annular body.

12. The battery according to claim 11, characterized in that One or more thinning areas are arranged on two long sides and / or two short sides of the annular body.

13. The battery according to claim 12, characterized in that The thinned area located on the long side of the annular body is arranged corresponding to the position of the explosion-proof valve.

14. The battery according to claim 12, characterized in that Two thinning areas are arranged on the short side of the annular body at intervals, the center distance between the two thinning areas is d, the width of the central hole of the annular body is c, and d≥0.5*c is satisfied.

15. The battery according to any one of claims 11 to 14, characterized in that The thickness of the support member is h, the thickness of the thinned area is e, and 0.05*h≤e≤0.2*h is satisfied; and / or, The explosion-proof valves are provided with two intervals, the center distance between the two explosion-proof valves is y, the length of the battery is L, and 1 / 3≤y / L≤1 / 2 is satisfied; and / or, The length L of the battery is ≥ 300 mm, and the width D of the battery is ≤ 30 mm; and / or, The length of the battery is L, the width of the battery is D, and L / D≥10; and / or, The width of the housing is B, the width of the support is b, and b≥0.5*B; and / or, The wall thickness of the side of the housing on which the explosion-proof valve is provided is g, satisfying g≥0.95 mm; and / or, The thickness of the support member is h, which satisfies 0.5 mm ≤ h ≤ 2 mm.

16. The battery according to any one of claims 11 to 14, characterized in that The limiting portion includes a first section and a second section, wherein the first end of the first section is connected to one side of the inner ring of the annular body, the first end of the second section is connected to the other side of the inner ring of the annular body, and the second end of the first section and the second end of the second section are arranged close to each other.

17. The battery according to claim 16, characterized in that The gap between the second end of the first section and the second end of the second section is less than 0.5 mm; and / or, The angle α between the side wall of the first section and the inner circle of the annular body is greater than or equal to 120°, and the angle α between the side wall of the second section and the inner circle of the annular body is greater than or equal to 120°; and / or, The side wall of the first section is transitionally connected to the second end of the first section via an arc structure, and the side wall of the second section is transitionally connected to the second end of the second section via an arc structure.

18. The battery according to any one of claims 11 to 14, characterized in that The support member further includes a protrusion connected to the inner wall of the annular body and extending toward the central hole of the annular body.

19. The battery according to claim 18, characterized in that The total area of ​​the side of the support member facing the explosion-proof valve is S, the sum of the areas of the side of the annular body and the protrusion facing the explosion-proof valve is S1, and 0.2≤S1 / S≤0.8 is satisfied; and / or, The width of the support member is b, and the spacing between the two protrusions along the width direction of the support member is f, satisfying f≥0.25*b.

20. A battery pack, characterized in that: A battery comprising the battery according to any one of claims 11 to 19.

21. A battery, characterized in that: include: The outer shell forms a receiving space inside; An explosion-proof valve, arranged on a side of the housing; A pole group, located in the accommodation space; A support member is arranged in the accommodating space, and the support member is located between the side of the shell where the explosion-proof valve is arranged and the pole group; the support member includes an annular body and a limiting portion, and the limiting portion is supported on both sides of the inner circle of the annular body along the width direction of the annular body.

22. The battery according to claim 21, characterized in that The limiting portion includes a first section and a second section, wherein the first end of the first section is connected to one side of the inner ring of the annular body, the first end of the second section is connected to the other side of the inner ring of the annular body, and the second end of the first section and the second end of the second section are arranged close to each other.

23. The battery according to claim 22, characterized in that A gap between the second end of the first section and the second end of the second section is less than 0.5 mm.

24. The battery according to claim 22 or 23, characterized in that An angle α between the side wall of the first section and the inner circle of the annular body is greater than or equal to 120°, and / or an angle α between the side wall of the second section and the inner circle of the annular body is greater than or equal to 120°.

25. The battery according to claim 22 or 23, characterized in that The side wall of the first section is connected to the second end of the first section through an arc-shaped transition structure, and / or the side wall of the second section is connected to the second end of the second section through an arc-shaped transition structure.

26. The battery according to any one of claims 21 to 23, characterized in that The limiting portion is provided with one, and the limiting portion is provided corresponding to the middle position of the annular body along the length direction; or, A plurality of the limiting portions are provided, and the plurality of the limiting portions are arranged at intervals along the length direction of the annular body.

27. The battery according to any one of claims 21 to 23, characterized in that The length L of the battery is greater than or equal to 300 mm, and the width D of the battery is less than or equal to 30 mm.

28. The battery according to any one of claims 21 to 23, characterized in that The central hole of the annular body is arranged corresponding to the explosion-proof valve.

29. The battery according to any one of claims 21 to 23, characterized in that The support member further includes a protrusion connected to the inner wall of the annular body and extending toward the central hole of the annular body.

30. A battery pack, characterized in that: A battery comprising the battery of any one of claims 21 to 29.

31. A battery, characterized in that: include: A housing is formed with a receiving cavity inside, and an explosion-proof valve is arranged on the side of the housing, and the explosion-proof valve is suitable for opening at a first preset pressure value; A pole group, arranged in the accommodating cavity; The support member is located between the side of the housing where the explosion-proof valve is provided and the electrode group, and at least one fracture zone is configured on the support member, and at least a part of the fracture zone is configured as a thinning portion, and the thickness of the thinning portion is less than the thickness of the main part of the support member, and the thinning portion is suitable for being broken at a second preset pressure value to conduct the accommodating cavity and the explosion-proof valve, wherein the second preset pressure The value is less than the first preset pressure value.

32. The battery according to claim 31, characterized in that The thickness of the thinned portion is H1, and the thickness of the main body of the support member is H, wherein 0.05≤H1 / H≤0.

5.

33. The battery according to claim 32, characterized in that Each of the fracture zones has at least two thinning portions spaced apart from each other.

34. A battery according to any one of claims 31 to 33, characterized in that The support member comprises a ring-shaped support body and an exhaust passage surrounded by the support body, the fracture zone is arranged on the support body, and the thinning portion is connected between an inner ring and an outer ring of the support body.

35. The battery according to claim 34, characterized in that The support member is in a "U" shape, and the support body has two first side portions located at two ends of the support member in a length direction and two second side portions located at two ends of the support member in a width direction.

36. The battery according to claim 35, characterized in that A breaking zone is arranged on each of the first side portions, and the breaking zone has two thinning portions arranged at intervals, and the distance between the two thinning portions is L1. The dimension of the exhaust channel along the width direction is L, wherein 0.2≤L1 / L≤1.

37. The battery according to claim 35, characterized in that The support member is provided with an explosion-proof corresponding area corresponding to the explosion-proof valve, the second side portion located in the explosion-proof corresponding area is provided with the fracture area, and the fracture area has at least two thinning portions arranged at intervals.

38. The battery according to claim 37, characterized in that The distance between two adjacent thinning portions on the second side portion is L2, and the dimension of the explosion-proof valve along the length direction of the support member is L3, wherein 0.1≤L2 / L3≤1.

2.

39. The battery according to claim 35, characterized in that A plurality of protrusions extending toward the exhaust passage are configured on the second side portion of the support body, and the plurality of protrusions on each second side portion are spaced apart and distributed along the length direction of the support member.

40. A battery pack, characterized in that: include: The battery according to any one of claims 31 to 39.

Images