Batteries and battery packs

Abstract

The present invention relates to the field of battery technology, and discloses a battery and a battery pack, comprising: a shell, a storage space is formed inside; an explosion-proof valve is arranged on the side of the shell; a battery cell is located in the storage space; a support member is arranged in the storage space; the support member comprises an annular body and a limiting part, the limiting part 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. The present invention reserves an exhaust space between the shell and the battery cell by arranging the support member, reduces the gas transmission resistance, facilitates the rapid discharge of the gas inside the battery, and ensures the safety of the battery; by arranging the thinning area, when the predetermined pressure inside the battery is reached, the annular body is torn at the thinning area, so that the gas on the periphery of the support member in the storage space enters the central hole of the annular body through the torn thinning area, and is discharged from the explosion-proof valve, thereby improving the discharge efficiency of the gas in the battery.

Description

Technical Field

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

[0002] When the battery has an internal cell or module short circuit, or is hit or soaked in water, a large amount of high-temperature gas will be generated in a short time and accumulated in the battery. Therefore, an explosion-proof valve is usually installed on the battery so that when the battery is operating abnormally and gas is generated inside, the gas can be discharged through the explosion-proof valve, thereby improving the safety performance of the battery and avoiding major safety accidents.

[0003] For batteries with a relatively long length, such as blade batteries, in order to shorten the gas transmission path during thermal runaway and facilitate gas discharge, explosion-proof valves are usually set on the side of the battery shell. However, the exhaust space between the side of the shell and the battery cell is small, which will lead to greater gas transmission resistance inside the battery, which is not conducive to the rapid discharge of gas inside the battery, and there are safety hazards. Summary of the invention

[0004] 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 cause a large gas transmission resistance inside the battery, is not conducive to the rapid discharge of the gas inside the battery, and poses a safety hazard.

[0005] In the first aspect, the present invention provides a battery, comprising: an outer shell, with a storage space formed inside; an explosion-proof valve, arranged on the side of the outer shell; a battery cell, located in the storage space; a support member, arranged in the storage space, the support member is located between the side of the outer shell where the explosion-proof valve is arranged and the battery cell; the support member comprises an annular body and a limiting portion, 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 zone is arranged on the annular body, and a plurality of the thinning zones are arranged at intervals along the circumference of the annular body, and the thinning zone extends along the width direction of the annular body.

[0006] Beneficial effects: by providing 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 exhaust of the 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 to avoid the support member from being concave and deformed in the width direction, which facilitates the assembly of the support member and ensures the exhaust effect of the center hole of the annular body; by providing a thinning area on the annular body, when the predetermined pressure inside the battery is reached, the annular body is torn at the thinning area, so that the gas on the periphery of 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.

[0007] In an optional embodiment, one or more thinning areas are provided on two long sides and / or two short sides of the annular body.

[0008] Beneficial effect: The gas on the outside of the two long sides and the outside of 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.

[0009] In an optional implementation, the thinned area located on the long side of the annular body is arranged corresponding to the position of the explosion-proof valve.

[0010] Beneficial effect: The transmission path from gas to explosion-proof valve is shortened, and gas is discharged quickly.

[0011] 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 center hole of the annular body is c, and d≥0.5*c is satisfied.

[0012] Beneficial effect: When the two thinning areas are torn, the part of the annular body located between the two thinning areas breaks off, so that an opening is formed 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 is made to ensure the opening width, which is conducive to the gas entering the central hole.

[0013] In an optional embodiment, the thickness of the support member is h, the thickness of the thinning zone 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, and 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.

[0014] Beneficial effects: 0.05*h≤e≤0.2*h, while ensuring that the support has sufficient strength, the thinning area can also be torn under a predetermined pressure. 1 / 3≤y / L≤1 / 2, to ensure that the gas at each position in the accommodating space can reach the explosion-proof valve through a shorter transmission path. L≥300mm, D≤30mm, and / or L / D≥10, therefore, the support is applied to batteries with a large length and a small width, so that the annular body is large in length and small in width, and the middle position of the annular body along the length direction is easy to be concave and deformed inward, therefore, by setting a limiter, support is provided to the annular body to avoid deformation of the annular body. b≥0.5*B, so that the support can provide effective support between the battery cell and the shell, effectively reducing the gas transmission resistance; g≥0.95mm, to ensure the installation strength of the explosion-proof valve. 0.5mm≤h≤2mm, while ensuring that the support has sufficient support strength, avoid the support from occupying too much internal space of the battery, and improve the battery energy density.

[0015] In an optional embodiment, 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.

[0016] Beneficial effects: The first section and the second section 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 section and the second end of the second section. During the exhaust process, when the gas reaches a predetermined pressure, the first section and the second section 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.

[0017] 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;

[0018] 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.

[0019] and / or, the 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 the 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°;

[0020] Beneficial effect: It prevents the gas from generating eddy currents at the connection between the side wall of the first section and the inner circle of the annular body and at the connection between the side wall of the second section and the inner circle of the annular body, thereby ensuring a smooth transition of the gas.

[0021] And / or, the side wall of the first section is connected to the second end of the first section via an arc-shaped transition structure, and the side wall of the second section is connected to the second end of the second section via an arc-shaped transition structure.

[0022] Beneficial effect: The blocking effect of the first subsection and the second subsection on the gas is reduced, so that the gas can flow smoothly between the central holes on both sides of the limiting part.

[0023] In an optional embodiment, the support member further includes a protrusion, which is connected to the inner wall of the annular body and extends toward the central hole of the annular body.

[0024] Beneficial effect: while ensuring the exhaust space of the central hole of the annular body, the supporting area of ​​the support between the shell and the battery cell is increased.

[0025] 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.

[0026] Beneficial effect: 0.2≤S1 / S≤0.8, while ensuring that the support has sufficient support area, the gas can also flow smoothly in the central hole. f≥0.25*b, ensuring that the gas flows smoothly in the central hole along the length direction.

[0027] In a second aspect, the present invention further provides a battery pack, comprising the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 is a schematic diagram of the overall structure of a battery according to an embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of the exploded structure of a battery according to an embodiment of the present invention;

[0031] Figure 3 It is a schematic structural diagram of a housing and an explosion-proof valve according to an embodiment of the present invention;

[0032] Figure 4 for Figure 1 A top view of the battery shown;

[0033] Figure 5 It is a schematic structural diagram of a battery cell and a support member according to an embodiment of the present invention;

[0034] Figure 6 It is a structural schematic diagram of a support member according to an embodiment of the present invention;

[0035] Figure 7 for Figure 5 Schematic diagram of the main structure;

[0036] Figure 8 It is a schematic diagram of a partial structure of a support member according to an embodiment of the present invention;

[0037] Fig. 9 It is a schematic diagram of another partial structure of a support member according to an embodiment of the present invention;

[0038] Fig.10 for Figure 7 Schematic diagram of the cross-sectional structure of the middle BB;

[0039] Fig.11 It is a schematic diagram of the partial structure of the limiting part of an embodiment of the present invention;

[0040] Fig.12 for Figure 4 Schematic diagram of the cross-sectional structure of AA.

[0041] Description of reference numerals:

[0042] 1. Shell; 101. Accommodating space; 102. Shell; 103. Cover plate; 104. Insulating protective film; 2. Explosion-proof valve; 3. Battery cell; 4. Support member; 401. Ring body; 4011. Thinning area; 4012. Center hole; 402. Limiting part; 4021. First subdivision; 4022. Second subdivision; 403. Protrusion. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the 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 creative work are within the scope of protection of the present invention.

[0044] Combine the following Figures 1 to 12 , describing an embodiment of the present invention.

[0045] According to an embodiment of the present invention, on the one hand, a battery is provided, comprising a housing 1, an explosion-proof valve 2, a battery cell 3 and a support member 4. A accommodating space 101 is formed inside the housing 1, the explosion-proof valve 2 is arranged on the side of the housing 1, and the battery cell 3 is located in the accommodating space 101. The support member 4 is arranged in the accommodating space 101, and is located between the side of the housing 1 where the explosion-proof valve 2 is arranged and the battery cell 3. The support member 4 comprises an annular body 401 and a limiting portion 402, and the limiting portion 402 is supported on both sides of the inner circle of the annular body 401 along the width direction of the annular body 401. A thinning area 4011 is arranged on the annular body 401, and a plurality of thinning areas 4011 are arranged at intervals along the circumference of the annular body 401, and the thinning area 4011 is extended along the width direction of the annular body 401.

[0046] By providing a support member 4, which is supported between the side of the outer shell 1 and the battery cell 3, an exhaust space is reserved between the outer shell 1 and the battery cell 3, thereby reducing the gas transmission resistance, facilitating the rapid exhaust of the gas inside the battery, and ensuring the safety of the battery; and, by providing a limiting portion 402, the two sides of the annular main body 401 are supported inside the annular main body 401, thereby preventing the support member 4 from being concavely deformed in the width direction, facilitating the assembly of the support member 4, and ensuring the exhaust effect of the center hole 4012 of the annular main body 401; by providing a thinning area 4011 on the annular main body 401, when the internal pressure of the battery reaches a predetermined level, the annular main body 401 is torn at the thinning area 4011, so that the gas on the periphery of the support member 4 in the accommodating space 101 enters the center hole 4012 of the annular main body 401 through the torn thinning area 4011, and is discharged from the explosion-proof valve 2, thereby improving the exhaust efficiency of the gas in the battery.

[0047] It is worth noting that the thinning area 4011 provided on the annular body 401 refers to reducing the thickness at a predetermined position of the annular body 401 , thereby forming the thinning area 4011 .

[0048] It should be noted that the gas in the battery passes through the central hole 4012 of the annular body 401 and is discharged through the explosion-proof valve 2 .

[0049] It is worth noting that for batteries with a relatively large length and a relatively small width, such as blade batteries, the support member 4 is arranged on the side of the battery corresponding to the support member 4, so that the support member 4 is also a structure with a relatively large length and a relatively small width. If the support member 4 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 4 can be die-cut into a "U" shape (that is, a ring-shaped structure), which is low in cost and easy to form. However, due to the long length of the support member 4, the middle part of the support member 4 in the length direction will be concave inward, making the support member 4 inconvenient to assemble. Therefore, in this embodiment, the annular body 401 can be supported by setting the limit portion 402 to avoid deformation.

[0050] In one embodiment, Figures 6 to 9 As shown, a plurality of thinning areas 4011 are provided on the two long sides and the two short sides of the annular body 401. The gas on the outside of the two long sides and the outside of the two short sides of the annular body 401 in the accommodating space 101 can quickly enter the central hole 4012 of the annular body 401, shortening the gas transmission path and facilitating gas discharge. That is, when the thinning area 4011 is torn, the gas around the battery cell 3 can enter the central hole 4012 of the annular body 401.

[0051] In one embodiment, Figure 7 As shown, the thinned area 4011 located on the long side of the annular body 401 is arranged corresponding to the position of the explosion-proof valve 2. The transmission path of the gas to the explosion-proof valve 2 is shortened, and the gas is discharged quickly.

[0052] In one embodiment, Figure 8 and Fig.10 As shown, two thinning areas 4011 are arranged at intervals on the short side of the annular body 401, the center distance between the two thinning areas 4011 is d, and the width of the central hole 4012 of the annular body 401 is c, satisfying d≥0.5*c. When the two thinning areas 4011 are torn, the part of the annular body 401 located between the two thinning areas 4011 breaks off, so that an opening is formed at the short side of the annular body 401, which is conducive to the gas outside the short side of the annular body 401 entering the central hole 4012; and d≥0.5*c is made to ensure the width of the opening, which is conducive to the gas entering the central hole 4012.

[0053] In one embodiment, Fig.10 As shown, the thickness of the support member 4 is h, and the thickness of the thinning area 4011 is e, which satisfies 0.05*h≤e≤0.2*h. When 0.05*h≤e≤0.2*h is satisfied, the thinning area 4011 can be torn under a predetermined pressure while ensuring that the support member 4 has sufficient strength. Specifically, if e<0.05*h, the thinning area 4011 will be too thin, which will make it inconvenient to process and manufacture the thinning area 4011 on the annular body 401, thereby making the yield rate of the support member 4 low and the production cost high; in addition, if the thinning area 4011 is too thin, the overall structural strength of the support member 4 will be insufficient, and deformation will easily occur at the thinning area 4011, which will be detrimental to the grasping and loading of the loading equipment during the assembly process. If e>0.2*h, the thickness of the thinning area 4011 will be larger, so that the strength of the thinning area 4011 is too high, the thinning area 4011 cannot be torn under the predetermined pressure, and the structural function of the thinning area 4011 will fail.

[0054] It should be noted that the explosion-proof valve 2 can be opened when the gas pressure reaches a first preset pressure P1, and the thinned area 4011 can be torn when the gas pressure reaches a second preset pressure P2, and P2 is less than P1.

[0055] In one embodiment, Figure 1 As shown, the length L of the battery is ≥ 300 mm, and the width D of the battery is ≤ 30 mm; the length of the battery is L, and the width of the battery is D, which satisfies L / D ≥ 10. Therefore, the support member 4 is applied to a battery with a larger length and a smaller width, so that the annular body 401 has a larger length and a smaller width, and the middle position of the annular body 401 along the length direction is easy to be concave and deformed inwards. Therefore, by setting the limiting portion 402, support is provided to the annular body 401 to prevent the annular body 401 from being deformed.

[0056] In one embodiment, Fig.12 As shown, the width of the shell 1 is B, and the width of the support member 4 is b, satisfying b≥0.5*B. Make b≥0.5*B, so that the support member 4 can provide effective support between the battery cell 3 and the shell 1, and effectively reduce the gas transmission resistance. Specifically, if b<0.5*B, the effective support area of ​​the support member 4 for the battery cell 3 is insufficient, and the battery cell 3 has the problem of deflection or pole piece slippage caused by unstable support; in addition, the smaller the width b of the support member 4, the greater the pressure on the contact position between the battery cell 3 and the support member 4 when the weight of the battery cell 3 remains unchanged, and the easier it will be to deform, thereby causing the slurry coated on the positive and negative electrodes inside the battery cell 3 to fall off, affecting the capacity of the battery cell 3 and the safety of the battery cell 3. Moreover, if b is less than 0.5*B, although the space formed between the two sides of the support member 4 and the inner wall of the outer shell 1 can be used for gas transmission, the area proportion of the central hole 4012 of the support member 4 will be greatly reduced, and the resistance of the gas to be discharged through the central hole 4012 of the support member 4 will be too large, and the gas discharged per unit time will be reduced, which is not conducive to the smooth discharge of the gas.

[0057] In one embodiment, Fig.12 As shown, the wall thickness of the side of the explosion-proof valve 2 provided on the shell 1 is g, satisfying g ≥ 0.95mm. Make g ≥ 0.95mm to ensure the installation strength of the explosion-proof valve 2. 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 part of the explosion-proof valve 2 commonly used in the relevant technology is 0.5mm. If the wall thickness g is less than 0.95mm, the installation step hole of the explosion-proof valve 2 is easy to deform during processing, and the yield rate is low; and 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 2 and the shell 1 is required to be high, and 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 unreliable welding, affecting the airtightness of the welding position.

[0058] Please note that Fig.12The wall thickness of the surface of the housing 1 where the explosion-proof valve 2 is not installed is s, satisfying s<g.

[0059] In one embodiment, Fig.12 As shown, the thickness of the support member 4 is h, which satisfies 0.5mm≤h≤2mm. When 0.5mm≤h≤2mm is set, while ensuring that the support member 4 has sufficient supporting strength, the support member 4 is prevented from occupying too much internal space of the battery, thereby improving the battery energy density. Specifically, if h<0.5mm, the center hole 4012 of the support member 4 has insufficient space in the height direction, and the cross-sectional area of ​​the center hole 4012 along the width and height directions is small. The gas encounters great resistance during the discharge process, and the gas discharged per unit time is reduced. The gas cannot be discharged in time, and the battery cell 3 is at risk of being "expanded" and exploded by the gas. If h>2mm, the larger the proportion of the accommodation space 101 occupied by the support member 4 in the height direction, the smaller the height of the battery cell 3 will be when the size of the accommodation space 101 inside the shell 1 is constant, and the energy of the single battery cell 3 will be correspondingly reduced, and the battery energy density will be reduced.

[0060] In one embodiment, Fig.11 As shown, the limiting part 402 includes a first sub-part 4021 and a second sub-part 4022, the first end of the first sub-part 4021 is connected to one side of the inner circle of the annular body 401, the first end of the second sub-part 4022 is connected to the other side of the inner circle of the annular body 401, and the second end of the first sub-part 4021 and the second end of the second sub-part 4022 are arranged close to each other. The first sub-part 4021 and the second sub-part 4022 are arranged close to each other to ensure the supporting effect of the limiting part 402 on the annular body 401 as a whole; there is a gap between the second end of the first sub-part 4021 and the second end of the second sub-part 4022, and during the exhaust process, when the gas reaches a predetermined pressure, the first sub-part 4021 and the second sub-part 4022 can be offset and moved in the length direction respectively, so that the central holes 4012 located on both sides of the limiting part 402 can be connected, so that the gas can be effectively discharged to the explosion-proof valve 2.

[0061] It is worth noting that when the gas pressure entering the center hole 4012 of the annular body 401 is relatively high, the gas will exert force on the first section 4021 and the second section 4022, causing the first section 4021 and the second section 4022 to produce an offset movement along the length direction, thereby increasing the distance between the first section 4021 and the second section 4022, so that the center holes 4012 on both sides of the limiting section 402 are connected.

[0062] It should be noted that the explosion-proof valve 2 can be opened when the gas pressure reaches a first preset pressure P1, and the first sub-portion 4021 and the second sub-portion 4022 can be offset when the gas pressure reaches a third preset pressure P3, and P3 is less than P1.

[0063] In one embodiment, the gap between the second end of the first subsection 4021 and the second end of the second subsection 4022 is less than 0.5 mm. Thus, while ensuring that the first subsection 4021 and the second subsection 4022 can generate an offset movement under a predetermined pressure, the first subsection 4021 and the second subsection 4022 can also provide a supporting effect on the annular body 401.

[0064] It is worth noting that if the distance between the first section 4021 and the second section 4022 is too large, it will be unable to provide effective support to both sides of the annular body 401 , resulting in a significant deformation of the annular body 401 .

[0065] In one embodiment, Fig.11 As shown, the angle α between the side wall of the first sub-section 4021 and the inner ring of the annular body 401 is greater than or equal to 120°, and the angle α between the side wall of the second sub-section 4022 and the inner ring of the annular body 401 is greater than or equal to 120°. This prevents the gas from generating eddy currents at the connection between the side wall of the first sub-section 4021 and the inner ring of the annular body 401 and at the connection between the side wall of the second sub-section 4022 and the inner ring of the annular body 401, thereby ensuring a smooth transition of the gas.

[0066] It is worth mentioning that please refer to Figure 7 and Fig.11 If the angle α is less than 120°, when the gas enters the right center hole 4012 from the left center hole 4012 or enters the left center hole 4012 from the right center hole 4012, the limiting portion 402 (the first division 4021 and the second division 4022) will cause a greater obstruction to the gas, causing the gas to generate vortices at the angle, affecting the circulation of the gas.

[0067] In one embodiment, Fig.11 As shown, the side wall of the first sub-portion 4021 is connected to the second end of the first sub-portion 4021 through an arc structure transition, and the side wall of the second sub-portion 4022 is connected to the second end of the second sub-portion 4022 through an arc structure transition. Therefore, the blocking effect of the first sub-portion 4021 and the second sub-portion 4022 on the gas is reduced, so that the gas can flow smoothly between the central holes 4012 located on both sides of the limiting portion 402.

[0068] In one embodiment, Figure 6 and Figure 7 As shown, one limiting portion 402 is provided, and one limiting portion 402 is provided corresponding to the middle position of the annular body 401 along the length direction. That is, one first sub-portion 4021 and one second sub-portion 4022 are provided respectively, and the first sub-portion 4021 is provided corresponding to the middle position of one side of the inner circle of the annular body 401, and the second sub-portion 4022 is provided corresponding to the middle position of the other side of the inner circle of the annular body 401, so that the first sub-portion 4021 and the second sub-portion 4022 are provided opposite to each other.

[0069] Of course, in other alternative embodiments, a plurality of limit portions 402 may be provided, and the plurality of limit portions 402 are spaced apart along the length direction of the annular body 401. While ensuring the exhaust space of the central hole 4012 of the annular body 401, the support effect of the limit portion 402 on the annular body 401 is ensured.

[0070] It is worth noting that one limiting portion 402 or several limiting portions 402 are arranged corresponding to the weak position of the annular body 401, so as to play a supporting role.

[0071] In one embodiment, see Figure 7 and Fig.11 The first section 4021 and the second section 4022 are symmetrically arranged along the transverse center line of the annular body 401 .

[0072] In one embodiment, see Figures 1 to 7 The center hole 4012 of the annular body 401 is arranged corresponding to the explosion-proof valve 2. Therefore, the gas in the battery can directly reach the explosion-proof valve 2 after passing through the center hole 4012 of the annular body 401, which is convenient for the gas to be discharged.

[0073] In one embodiment, Figures 6 to 9 As shown, the support member 4 further includes a protrusion 403, which is connected to the inner wall of the annular body 401 and extends toward the central hole 4012 of the annular body 401. While ensuring the exhaust space of the central hole 4012 of the annular body 401, the support area of ​​the support member 4 between the housing 1 and the battery cell 3 is increased.

[0074] It is worth noting that when the supporting area of ​​the support member 4 is too small, the supporting strength of the support member 4 is insufficient to ensure that a stable exhaust space is formed between the housing 1 and the battery cell 3. However, if the supporting area of ​​the support member 4 is increased, that is, the width of the annular body 401 is increased, the area of ​​the center hole 4012 will be reduced as a whole, which is not conducive to exhaust. Therefore, in this embodiment, a number of protrusions 403 are arranged in sequence along the length direction of the inner ring of the annular body 401 to increase the supporting area, and the area of ​​the center hole 4012 will not be reduced as a whole, thereby ensuring the exhaust effect. For further information, please refer to Figure 7 The plurality of protrusions 403 located on one side of the inner circle of the annular body 401 are staggered with the plurality of protrusions 403 located on the other side of the inner circle of the annular body 401, thereby avoiding gas obstruction caused by the relative arrangement of the two protrusions 403.

[0075] It should be noted that the shape of the protrusion 403 can be semicircular, rectangular, trapezoidal, triangular, etc.

[0076] In one embodiment, the total area of ​​the side of the support member 4 facing the explosion-proof valve 2 is S, and the sum of the areas of the side of the annular body 401 and the protrusion 403 facing the explosion-proof valve 2 is S1, which satisfies 0.2≤S1 / S≤0.8. When 0.2≤S1 / S≤0.8 is satisfied, the gas can flow smoothly in the center hole 4012 while ensuring that the support member 4 has sufficient support area. Specifically, S is the total area of ​​the large surface of the support member 4, that is, the area occupied by the center hole 4012; S1 is the effective support area of ​​the support member 4, that is, the area that can support the housing 1 and the battery cell 3. If S1 / S<0.2, the effective support area will be too small, and the battery cell 3 will have problems such as deflection or pole piece slippage caused by unstable support; if S1 / S>0.8, the area of ​​the center hole 4012 will be too small, which is not conducive to the smooth flow of gas.

[0077] In one embodiment, Fig. 9 As shown, the width of the support member 4 is b, and the spacing between the two protrusions 403 along the width direction of the support member 4 is f, satisfying f≥0.25*b. When f≥0.25*b, the gas can flow smoothly in the central hole 4012 along the length direction.

[0078] In one embodiment, Figure 4 As shown, two explosion-proof valves 2 are arranged at intervals, the center distance between the two explosion-proof valves 2 is y, and the length of the battery is L, which satisfies 1 / 3≤y / L≤1 / 2. 1 / 3≤y / L≤1 / 2 ensures that the gas at each position in the accommodation space 101 can reach the explosion-proof valve 2 through a shorter transmission path.

[0079] It is worth noting that the two explosion-proof valves 2 are respectively arranged corresponding to the two central holes 4012 located on both sides of the limiting portion 402.

[0080] Of course, in other alternative implementations, the explosion-proof valves 2 may also be provided in other numbers, such as one, three, four, etc. The number of explosion-proof valves 2 may be specifically set according to design requirements.

[0081] It should be noted that when there are one or more explosion-proof valves 2 , the thinned area 4011 on the long side of the annular body 401 needs to be arranged to correspond to the position of the explosion-proof valve 2 .

[0082] In one embodiment, Figure 1 As shown, the housing 1 is a closed structure, thereby enclosing a receiving space 101. Specifically, the housing 1 includes a shell 102 and a cover plate 103. The shell 102 is provided with openings at both ends, and two cover plates 103 are provided, and the two cover plates 103 respectively close the two openings at both ends of the shell 102.

[0083] Of course, in other alternative embodiments, one end of the shell 102 is open, and the other end of the shell 102 is closed, and a cover plate 103 is provided, and a cover plate 103 is closed at the opening of one end of the shell 102.

[0084] It should be noted that the cover plate 103 is electrically connected to the battery cell 3 .

[0085] In one embodiment, Figure 2 As shown, the housing 1 further includes an insulating protective film 104 , which is disposed between the inner surface of the housing 102 and the side surface of the battery cell 3 to insulate the battery cell 3 from the housing 102 .

[0086] It is worth mentioning that please refer to Figure 2 , the insulating protection film 104 is arranged on the outside of the support member 4.

[0087] It should be further explained that when the battery needs to be exhausted, the battery is in a high temperature and high pressure state, and at this time, the provision of the insulating protective film 104 will not affect the exhaust of the gas.

[0088] According to another aspect of an embodiment of the present invention, a battery pack is provided, comprising the above-mentioned battery.

[0089] Although the embodiments of the present invention have been described in conjunction with 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, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. 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 accommodation space, and the support member is located between the side of the shell provided with the explosion-proof valve and the battery core; the support member comprises 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 the thinning areas are arranged at intervals along the circumference of the annular body, and the thinning area is extended along the width direction of the annular body; One or more thinning areas are provided on two long sides and two short sides of the annular body; The thinning area located on the long side of the annular body is arranged corresponding to the position of the explosion-proof valve; Two thinning areas are arranged at intervals 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; The limiting portion includes a first sub-section and a second sub-section, wherein a first end of the first sub-section is connected to one side of the inner ring of the annular body, a first end of the second sub-section is connected to the other side of the inner ring of the annular body, and a second end of the first sub-section and a second end of the second sub-section are arranged close to each other; The gap between the second end of the first subdivision and the second end of the second subdivision is less than 0.5 mm; The included 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 included 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°; The side wall of the first section is transitionally connected to the second end of the first section through an arc structure, and the side wall of the second section is transitionally connected to the second end of the second section through an arc structure; The support member also includes a protrusion, which is connected to the inner wall of the annular body and extends toward the center hole of the annular body. The total area of ​​the side of the support member facing the explosion-proof valve is S, and 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.

2. The battery according to claim 1, 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.

3. The battery according to claim 1, characterized in that 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.

4. A battery pack, characterized in that: A battery comprising the battery according to any one of claims 1 to 3.

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