Battery

Abstract

The invention relates to the technical field of batteries, and particularly discloses a battery, the battery comprises an explosion-proof valve, a cover plate body, a shell and a plastic part, the cover plate body is connected with the shell, and the cover plate body and the shell jointly form an accommodating cavity for placing a pole group. The plastic part is arranged on the side, close to the containing cavity, of the cover plate body or the shell, the end, in the third direction, of the supporting table abuts against the plastic part, and the cover plate body is insulated from the pole group through the plastic part. Through the arrangement, after thermal runaway of a battery occurs and a plastic part is melted, the supporting table can continuously support the pole group, so that the pole group is prevented from randomly flowing along with high-temperature and high-pressure gas and blocking the mounting hole in the cover plate body, and a gap is reserved between the mounting hole of the cover plate body and the pole group; high-temperature and high-pressure gas can be conveniently and directionally discharged from the explosion-proof valve arranged in the mounting hole, so that the exhaust effect of the explosion-proof valve is improved, and the safety of the battery is high.

Description

Technical Field

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

[0002] Lithium-ion batteries have become the representative of high-performance batteries due to their advantages such as high operating voltage, high specific energy, large capacity, low self-discharge, good cyclability, long service life, light weight and small size. The structure of a conventional lithium-ion battery includes a cover body, a shell, a pole group and an insulating member. The cover body and the shell are welded to form a closed space to protect the pole group. An explosion-proof valve is integrated on the cover body, which can directional discharge the high-temperature and high-pressure gas in the closed space when the battery has thermal runaway. The insulating member is arranged in the sealed space formed by the shell and the cover body, and the insulating member is located between the cover body and the pole group. On the one hand, the pole group can be supported by the insulating member to prevent the pole group from shaking in the shell, and the fixing effect is good; on the other hand, the insulating member can prevent the pole group from short-circuiting with the cover body to ensure the electrical safety of the battery.

[0003] However, the insulating parts are generally made of plastic materials (for example, PP materials), which have limited strength and high temperature resistance, and generally melt at around 150°C. When the battery has thermal runaway, the temperature in the enclosed space is high, and the insulating parts will melt and fail. At this time, only the pole group, which is still solid, is left in the enclosed space, and the gap between the pole group and the cover plate body increases. In addition, due to the lack of support for the pole group by the insulating parts, the pole group has a high degree of freedom in the shell. When the high-temperature and high-pressure gas is exhausting in a direction through the explosion-proof valve, the pole group will move with the high-temperature and high-pressure airflow, and there is a risk of blocking the exhaust channel of the explosion-proof valve, which reduces the exhaust efficiency of the explosion-proof valve and has low safety performance. Summary of the invention

[0004] The object of the present invention is to provide a battery which can prevent the explosion-proof valve from being blocked due to the movement of the pole group when the battery has thermal runaway, and the explosion-proof valve has high exhaust efficiency and good safety performance.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention provides a battery, comprising:

[0007] Explosion-proof valve;

[0008] A cover body and a shell, wherein the cover body and the shell are connected and enclose a receiving cavity, one of the cover body and the shell is provided with a mounting hole and a support platform, the explosion-proof valve is arranged in the mounting hole, the support platform is arranged at one side of the mounting hole along the first direction, and the support platform extends along the second direction;

[0009] A plastic part, wherein the plastic part is arranged on a side of the cover body or the shell close to the accommodating cavity, and an end of the support platform along the third direction abuts against the plastic part;

[0010] Along the first direction, a distance between a side of the support platform facing away from the mounting hole and an adjacent side edge of the cover body or the shell is A, and a value range of A is: 5mm≤A≤8mm.

[0011] Optionally, along the second direction, the size of the mounting hole is B, the size of the support platform is C, and B and C satisfy: 1.5≤C / B≤2.0;

[0012] Among them, the value range of B is: 20mm≤B≤60mm;

[0013] The value range of C is: 30mm≤C≤120mm.

[0014] Optionally, along the third direction, the height of the support platform is F, and the value range of F is 3mm≤F≤5mm.

[0015] Optionally, the mounting hole and the support platform are arranged on the cover body, the distance between a side of the support platform close to the mounting hole and an adjacent side of the mounting hole along the first direction is D, and the width of the cover body along the first direction is L2;

[0016] D and L2 satisfy: 0.15≤D / L2≤0.35;

[0017] Among them, the value range of D is: 6mm≤D≤15mm;

[0018] The value range of L2 is: 35mm≤L2≤75mm.

[0019] Optionally, the width of the support platform along the first direction is E, and E and L2 satisfy: 0.15≤E / L2≤0.4;

[0020] Among them, the value range of E is: 8mm≤E≤20mm.

[0021] Optionally, two support platforms are provided, and the two support platforms are symmetrically arranged on both sides of the mounting hole along the first direction.

[0022] Optionally, the plastic part is provided with a plurality of ventilation holes, which are arranged at intervals on the plastic part, and along the third direction, the projections of the plurality of ventilation holes on the cover body or the shell at least partially overlap with the projections of the mounting holes on the cover body or the shell.

[0023] Optionally, a side of the plastic part facing the cover body or the shell is provided with an avoidance groove, and the support platform is embedded in the avoidance groove.

[0024] Optionally, the plastic part includes a plastic body, a first flange and a second flange, the first flange and the second flange are arranged on the side of the plastic body facing the cover body or the shell, the first flange is arranged around the circumference of the plastic body, the second flange is connected to the first flange, and the second flange, the first flange and the plastic body form an avoidance groove.

[0025] Optionally, the plastic part is provided with supporting ribs, and the supporting ribs are connected to the first flange and / or the second flange.

[0026] The beneficial effects of the present invention are:

[0027] The present invention provides a battery, including an explosion-proof valve, a cover body, a shell and a plastic part. The cover body is connected to the shell and forms a receiving cavity for placing a pole group together with the shell. The plastic part is arranged on the side of the cover body or the shell close to the receiving cavity, and the end of the support platform along the third direction abuts against the plastic part, and the cover body and the pole group are insulated by the plastic part. Through the above arrangement, after the battery has thermal runaway and the plastic part is melted, the support platform can continue to support the pole group, so as to avoid the pole group from randomly flowing with the high-temperature and high-pressure gas, causing the pole group to block the mounting hole on the cover body, and ensure that there is a gap between the mounting hole of the cover body and the pole group, so as to facilitate the directional discharge of high-temperature and high-pressure gas from the explosion-proof valve arranged in the mounting hole, improve the exhaust effect of the explosion-proof valve, and increase the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0029] Figure 1 This is a schematic structural diagram of the cover plate body provided in the first embodiment of the present invention;

[0030] Figure 2 A top view of the cover plate body provided in the first embodiment of the present invention;

[0031] Figure 3 This is a schematic structural diagram of the cover body and the plastic part provided in the first embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the structure of the plastic part provided in the first embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the structure of a battery provided in Embodiment 2 of the present invention;

[0034] Figure 6 This is a partial enlarged view of the battery provided in the second embodiment of the present invention.

[0035] In the figure:

[0036] 100, cover body; 110, mounting hole; 111, limiting flange; 120, support platform; 200, plastic part; 210, plastic part body; 211, vent hole; 220, first flange; 230, second flange; 231, avoidance groove; 240, supporting rib; 300, shell; 310, first side wall; 320, second side wall. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0041] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0044] Embodiment 1

[0045] like Figure 1-Figure 3 As shown, this embodiment provides a battery, which includes an explosion-proof valve, a cover body 100, a shell 300 and a plastic part 200. The cover body 100 is connected to the shell 300 and forms a receiving cavity for placing the electrode group together with the shell 300.

[0046] In this embodiment, the installation hole 110 and the support platform 120 are provided on the cover body 100 as an example. The explosion-proof valve is arranged in the installation hole 110, the support platform 120 is arranged on one side of the installation hole 110 along the first direction, and the support platform 120 extends along the second direction. The plastic part 200 is arranged on one side of the cover body 100 close to the accommodating cavity, and the plastic part 200 is located between the cover body 100 and the pole group. The end of the support platform 120 along the third direction abuts against the plastic part 200, and the cover body 100 is insulated from the pole group by the plastic part 200. Among them, the first direction is the width direction of the cover body 100, that is, Figure 1 The second direction is the length direction of the cover body 100, that is, Figure 1 The third direction is the height direction of the cover body 100, that is, Figure 1 The Z-axis direction shown in .

[0047] Through the above arrangement, after the battery has thermal runaway and the plastic part 200 is melted, the support platform 120 can continue to support the electrode group, preventing the electrode group from randomly flowing with the high-temperature and high-pressure gas, causing the electrode group to block the mounting hole 110 on the cover body 100, ensuring that there is a gap between the mounting hole 110 of the cover body 100 and the electrode group, facilitating the directional discharge of high-temperature and high-pressure gas from the explosion-proof valve set in the mounting hole 110, and improving the exhaust effect of the explosion-proof valve. It should be noted that the explosion-proof valve is in the open state at this time.

[0048] Optionally, a limiting flange 111 is provided on the inner wall of the mounting hole 110, and the explosion-proof valve can be installed into the mounting hole 110 from one side of the cover body 100, and abut against the limiting flange 111 on the inner wall of the mounting hole 110, which indicates that the explosion-proof valve is installed in place, and the explosion-proof valve can be welded to the cover body 100. The setting of the limiting flange 111 ensures that the positioning between the explosion-proof valve and the cover body 100 is accurate, and the assembly accuracy is high. In addition, the limiting flange 111 can also play the role of temporarily fixing the explosion-proof valve, which facilitates the welding operation of the explosion-proof valve and the cover body 100.

[0049] Continue to see Figure 2 , along the first direction, the distance between the side of the support platform 120 away from the mounting hole 110 and the adjacent side of the cover body 100 is A, and the value range of A is: 5mm≤A≤8mm. For example, the value of A can be 5mm, 6mm, 7mm or 8mm. By controlling the value of A within the above range, it is convenient to assemble the cover body 100 and the shell 300, the assembly accuracy is high, and a large exhaust space is formed between the support platform 120 and the mounting hole 110, and the exhaust is smooth. Otherwise, when the value of A is too small, there is a risk of interference when assembling the cover body 100 and the shell 300, which affects the assembly accuracy; when the value of A is too large, the distance between the support platform 120 and the mounting hole 110 is close, which affects the exhaust.

[0050] Further, along the second direction, the size of the mounting hole 110 is B, the size of the support platform 120 is C, and B and C satisfy: 1.5≤C / B≤2.0. For example, the value of C / B can be 1.5, 1.6, 1.7, 1.8, 1.9 or 2.0. The value range of B is: 20mm≤B≤60mm, and the value range of C is: 30mm≤C≤120mm. That is, when the value of B is 20mm, the value of C can be 30mm, 35mm or 40mm. When the value of B is 40mm, the value of C can be 60mm, 70mm or 80mm. When the value of B is 60mm, the value of C can be 90mm, 105mm or 120mm.

[0051] By controlling the value of C / B within the above range, it is ensured that the contact area between the support platform 120 and the electrode group is large, the supporting effect on the electrode group is good, the mounting hole 110 on the cover body 100 is not blocked, and the explosion-proof valve is vented smoothly. Otherwise, when the value of C / B is too small, the size of the support platform 120 along the second direction is small, the supporting effect on the electrode group is not good, the mounting hole 110 on the cover body 100 is blocked, the explosion-proof valve is not vented smoothly, the exhaust efficiency is reduced, and the risk of explosion is prone to occur. Of course, the value of C / B should not be too large, otherwise the size of the support platform 120 along the second direction is too large, the high-temperature and high-pressure gas flowing along the first direction is blocked, the exhaust efficiency is reduced, and the safety is poor.

[0052] Continue to see Figure 1 , along the third direction, the height of the support platform 120 in this embodiment is F, and the value range of F is 3mm≤F≤5mm. For example, the value of F can be 3mm, 4mm or 5mm, etc. By limiting the value of F within the above range, after the plastic part 200 is melted and the cover body 100 abuts against the electrode group, the exhaust space enclosed between the cover body 100 and the electrode group is larger, which is beneficial to improving the exhaust efficiency of the explosion-proof valve and has high safety.

[0053] Continue to see Figure 2 , the distance between the side of the support platform 120 close to the mounting hole 110 and the adjacent side of the mounting hole 110 along the first direction is D, the width of the cover body 100 along the first direction is L2, and D and L2 satisfy: 0.15≤D / L2≤0.35. For example, the value of D / L2 can be 0.15, 0.20, 0.25 or 0.35. Among them, the value range of D is: 6mm≤D≤15mm, and the value range of L2 is: 35mm≤L2≤75mm. That is, when the value of L2 is 35mm, the value of D can be 6mm, 8mm or 12mm. When the value of L2 is 75mm, the value of D can be 12mm, 14mm or 15mm.

[0054] Optionally, the support platform 120 can be formed on the cover body 100 by stamping. By controlling the value of D within the above range, it can be ensured that after the support platform 120 is stamped, the flatness of the surrounding positions of the mounting hole 110 on the cover body 100 is good. Otherwise, when the value of D is too small, the distance between the support platform 120 and the mounting hole 110 is too close, and the flatness of the surrounding positions of the mounting hole 110 on the cover body 100 is poor, which affects the welding quality between the explosion-proof valve and the cover body 100 and there is a risk of sealing failure. Of course, the value of D should not be too large, otherwise the distance between the support platform 120 and the mounting hole 110 is too far, the support effect on the pole group is reduced, and there is a risk that the pole group blocks the mounting hole 110 on the cover body 100.

[0055] The width of the support table 120 along the first direction is E, and E and L2 satisfy: 0.15≤E / L2≤0.4. For example, the value of E / L2 can be 0.15, 0.20, 0.25, 0.30 or 0.40. Among them, the value range of E is: 8mm≤E≤20mm. That is, when the value of L2 is 35mm, the value of E can be 8mm, 10mm, 12mm or 14mm. When the value of L2 is 75mm, the value of E can be 12mm, 15mm, 18mm or 20mm.

[0056] By controlling the value of E within the above range, it can be ensured that the area of ​​the support platform 120 that can contact the electrode group is large, and the support platform 120 can ensure good support effect on the electrode group, and the support platform 120 will not be too sharp and easy to stamp. Otherwise, when the value of E is too small, the support effect of the support platform 120 on the electrode group decreases, there is a risk that the electrode group blocks the mounting hole 110 on the cover body 100, the explosion-proof valve is not vented smoothly, and the support platform 120 is not easy to stamp, and there is a situation where the cover body 100 is broken, and the processing yield is low.

[0057] Optionally, two support platforms 120 are provided in this embodiment, and the two support platforms 120 are symmetrically arranged on both sides of the mounting hole 110 along the first direction. By providing two support platforms 120, it can be ensured that when the cover body 100 supports the pole group, the force on the pole group is more balanced, and the supporting effect is better. It should be noted that the layout of each support platform 120 on the cover body 100 meets the above-mentioned size restrictions.

[0058] Continue to see Figure 3 and Figure 4 In this embodiment, the plastic part 200 is provided with a plurality of vent holes 211, and the plurality of vent holes 211 are arranged at intervals on the plastic part 200. Along the third direction, the projections of the plurality of vent holes 211 on the cover body 100 at least partially overlap with the projections of the mounting holes 110 on the cover body 100. After the battery has thermal runaway, when the internal temperature of the battery has not yet risen to the melting point of the plastic part 200, the plastic part 200 maintains its pre-melting shape to support the electrode group. At this time, the high-temperature and high-pressure gas in the accommodating cavity can be discharged to the explosion-proof valve through the vent holes 211, so that the explosion-proof valve opens and releases pressure.

[0059] Furthermore, a side of the plastic part 200 facing the cover body 100 is provided with an escape groove 231, and the support platform 120 is embedded in the escape groove 231. The plastic part 200 insulates the electrode group and the cover body 100. By providing the escape groove 231, it is possible to avoid wasting space in the accommodating cavity, reduce the occupied space, increase the volume of the electrode group, and help improve the energy density of the battery.

[0060] Optionally, the plastic part 200 in this embodiment includes a plastic part body 210, a first flange 220 and a second flange 230. The first flange 220 and the second flange 230 are arranged on one side of the plastic part body 210 facing the cover plate body 100. The first flange 220 is arranged around the circumference of the plastic part body 210. The second flange 230 is connected to the first flange 220. The second flange 230, the first flange 220 and the plastic part body 210 together form an avoidance groove 231. The support platform 120 can be just embedded in the avoidance groove 231. Since two support platforms 120 are provided in this embodiment, two second flanges 230 are also provided on the plastic part 200, thereby forming two avoidance grooves 231 on the plastic part 200. One support platform 120 is arranged in each avoidance groove 231. A plurality of vents 211 are located between the two avoidance grooves 231 along the first direction.

[0061] Furthermore, the plastic part 200 is provided with a support rib 240, and the support rib 240 is connected to the first flange 220 and / or the second flange 230. The provision of the support rib 240 increases the mechanical strength of the plastic part 200, and the plastic part 200 is not easily deformed, thereby ensuring that the plastic part 200 has a good supporting effect on the cover body 100 and the pole group, and the pole group is well fixed in the housing 300 and is not easy to shake.

[0062] The thermal runaway control is verified using samples of different design sizes to verify the values ​​of the relevant parameters A, B, C, and C / B of the cover body 100 of the above-mentioned battery. The verification results are shown in Table 1.

[0063] Table 1

[0064]

[0065] From the above results, it can be concluded that the support platform 120 is not provided on the cover body 100 of sample 1. After the battery thermal runaway occurs and the plastic part 200 is melted, the cover body 100 has no support for the electrode group, the mounting hole 110 on the cover body 100 is blocked by the electrode group, the exhaust efficiency of the explosion-proof valve is low, explosion is prone to occur, the safety is low, and the battery product is defective.

[0066] In samples 2 and 3, although a support platform 120 is provided on the cover body 100, the C / B value thereof does not satisfy the size restriction of 1.5≤C / B≤2.0, and exceeds the lower limit of 1.5≤C / B≤2.0. The size of the support platform 120 along the second direction is relatively small. After the battery has thermal runaway and the plastic part 200 is melted, the cover body 100 has poor support effect on the electrode group. The mounting hole 110 on the cover body 100 may still be blocked by the electrode group. The exhaust efficiency of the explosion-proof valve is low, and there is a certain explosion risk, low safety, and a defective battery product.

[0067] In samples 4, 5 and 6, the values ​​of the relevant parameters A, B, C, and C / B of the cover body 100 meet their corresponding size restrictions. At this time, the support platform 120 has an obvious supporting effect on the electrode group, and the flow space formed between the cover body 100 and the electrode group is large. The explosion-proof valve exhausts smoothly, the exhaust efficiency is high, there is no risk of explosion, and the battery product is good.

[0068] In sample 7, the value of parameter C / B of the cover body 100 does not meet the size limit of 1.5≤C / B≤2.0, and exceeds the upper limit of 1.5≤C / B≤2.0. The size of the support platform 120 along the second direction is too large, blocking the high-temperature and high-pressure gas along the width direction of the cover body 100 (i.e., the first direction). The exhaust of the explosion-proof valve is blocked, the exhaust efficiency is low, there is a risk of explosion, and the battery product is defective.

[0069] In samples 8, 9, 10 and 11, the values ​​of relevant parameters A, B, C, and C / B of the cover body 100 meet their corresponding size restrictions. At this time, the support platform 120 has an obvious supporting effect on the electrode group, and the flow space formed between the cover body 100 and the electrode group is large. The explosion-proof valve exhausts smoothly, the exhaust efficiency is high, there is no risk of explosion, and the battery product is good.

[0070] In sample 12, the value of parameter C / B of the cover body 100 does not meet the size limit of 1.5≤C / B≤2.0, and exceeds the upper limit of 1.5≤C / B≤2.0. The size of the support platform 120 along the second direction is too large, blocking the high-temperature and high-pressure gas along the width direction of the cover body 100 (i.e., the first direction). The exhaust of the explosion-proof valve is blocked, the exhaust efficiency is low, there is a risk of explosion, and the battery product is defective.

[0071] The thermal runaway control of the relevant parameters D, E, L2, D / L2 and E / L2 of the cover body 100 of the above-mentioned battery is verified using samples of different design sizes. The verification results are shown in Table 2.

[0072] Table 2

[0073]

[0074] From the above results, it can be concluded that the support platform 120 is not provided on the cover body 100 of sample 1. After the battery thermal runaway occurs and the plastic part 200 is melted, the cover body 100 has no support for the electrode group, the mounting hole 110 on the cover body 100 is blocked by the electrode group, the exhaust efficiency of the explosion-proof valve is low, explosion is prone to occur, the safety is low, and the battery product is defective.

[0075] In sample 2, although a support platform 120 is provided on the cover body 100, the value of E is relatively small, which is smaller than the minimum value of the size range of 8mm≤E≤20mm. The size of the support platform 120 along the first direction is relatively small, and the contact area with the electrode group is small. After the battery thermal runaway occurs and the plastic part 200 is melted, the cover body 100 has a poor support effect on the electrode group. The mounting hole 110 on the cover body 100 may still be blocked by the electrode group. The exhaust efficiency of the explosion-proof valve is low, there is a certain explosion risk, low safety, and the battery product is defective.

[0076] In sample 3, although a support platform 120 is provided on the cover body 100, the value of D is too small, which is smaller than the minimum value of the size range of 6mm≤D≤15mm. The distance between the support platform 120 and the mounting hole 110 is too close. After the battery thermally runs away and the plastic part 200 is melted, the exhaust space enclosed by the two support platforms 120 on the cover body 100 and the pole group is small, the exhaust efficiency of the explosion-proof valve is low, there is a certain explosion risk, the safety is low, and the battery product is defective.

[0077] In samples 4, 5, 6, 7, 8, 9 and 10, the values ​​of the relevant parameters D, E, L2, D / L2 and E / L2 of the cover body 100 meet their corresponding size restrictions. At this time, the support platform 120 has an obvious supporting effect on the electrode group, and the flow space formed between the cover body 100 and the electrode group is large, the explosion-proof valve exhausts smoothly, the exhaust efficiency is high, there is no risk of explosion, and the battery product is good.

[0078] In sample 11, the value of parameter D of the cover body 100 is too large, larger than the maximum value of the size range of 6mm≤D≤15mm, and the value of D / L2 does not meet the size limit of 0.15≤D / L2≤0.35, exceeding the upper limit of 0.15≤D / L2≤0.35. The distance between the support platform 120 and the mounting hole 110 along the width direction of the cover body 100 is far, and the support effect on the electrode group is not good. There is a risk that the mounting hole 110 is blocked by the electrode group, the exhaust efficiency of the explosion-proof valve is low, and it is easy to explode, with low safety and a defective battery product.

[0079] In samples 12, 13, 14, 15 and 16, the values ​​of the relevant parameters D, E, L2, D / L2 and E / L2 of the cover body 100 meet their corresponding size restrictions. At this time, the support platform 120 has an obvious supporting effect on the electrode group, and the flow space formed between the cover body 100 and the electrode group is large. The explosion-proof valve exhausts smoothly, the exhaust efficiency is high, there is no risk of explosion, and the battery product is good.

[0080] In sample 17, the value of parameter D of the cover body 100 is too large, larger than the maximum value of the size range of 6mm≤D≤15mm. The distance between the support platform 120 and the mounting hole 110 along the width direction of the cover body 100 is relatively far, and the supporting effect on the electrode group is not good. There is a risk that the mounting hole 110 will be blocked by the electrode group. The exhaust efficiency of the explosion-proof valve is low, which is prone to explosion, low safety, and a defective battery product.

[0081] Embodiment 2

[0082] This embodiment further provides a battery, which is different from the battery in the first embodiment in that the mounting hole 110 and the support platform 120 in this embodiment are arranged on one of the side walls of the housing 300 .

[0083] See also Figure 5 and Figure 6 The battery in this embodiment may be a blade battery, and the housing 300 is arranged along the second direction ( Figure 5 Openings are formed at both ends of the cover body 100 (in the X-axis direction shown in the figure), and two cover bodies 100 are provided. Each cover body 100 is connected to an opening of the shell 300 and seals the opening. The two cover bodies 100 and the shell 300 form a accommodating cavity for placing the pole group.

[0084] The housing 300 includes two first side walls 310 disposed opposite to each other along the third direction, and a first side wall 310 disposed along the first direction ( Figure 5 The first side wall 310 is connected to the second side wall 320, and the area of ​​the first side wall 310 is smaller than the area of ​​the second side wall 320. In this embodiment, the mounting hole 110 and the support platform 120 are arranged on the first side wall 310. The plastic part 200 is arranged on the side of the first side wall 310 close to the accommodating cavity, and the support platform 120 abuts against the plastic part 200, and the pole group is insulated from the shell 300 by the plastic part 200.

[0085] There are two support platforms 120, and the two support platforms 120 are symmetrically arranged on both sides of the mounting hole 110 along the first direction. Along the first direction, the distance between the side of each support platform 120 away from the mounting hole 110 and the adjacent side of the first side wall 310 of the shell 300 is A, and the value range of A is: 5mm≤A≤8mm. For example, the value of A can be 5mm, 6mm, 7mm or 8mm. By controlling the value of A within the above range, it is convenient to assemble the plastic part 200 and the shell 300, the assembly accuracy is high, and the exhaust space formed between the support platform 120 and the mounting hole 110 is large, and the exhaust is smooth. Otherwise, when the value of A is too small, there is a risk of interference when assembling the plastic part 200 and the shell 300, which affects the assembly accuracy; when the value of A is too large, the distance between the support platform 120 and the mounting hole 110 is close, which affects the exhaust.

[0086] The plastic part 200 is provided with a plurality of vent holes 211, which are arranged at intervals on the plastic part 200. Along the third direction, the projections of the plurality of vent holes 211 on the first side wall 310 of the housing 300 at least partially overlap with the projections of the mounting hole 110 on the first side wall 310 of the housing 300. After the battery has thermal runaway, when the internal temperature of the battery has not yet risen to the melting point of the plastic part 200, the plastic part 200 maintains its pre-melting shape to support the electrode group. At this time, the high-temperature and high-pressure gas in the accommodating cavity can be discharged to the explosion-proof valve through the vent holes 211, so that the explosion-proof valve opens and releases pressure.

[0087] A side of the plastic part 200 facing the first side wall 310 of the housing 300 is provided with an escape groove 231, and the support platform 120 is embedded in the escape groove 231. By providing the escape groove 231, it is possible to avoid wasting space in the accommodating cavity, reduce the occupied space, increase the volume of the electrode group, and help improve the energy density of the battery.

[0088] The rest of the structure of the battery in this embodiment is the same as that in the first embodiment and will not be described again here.

[0089] Obviously, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

[0090] Note that in the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A battery, characterized in that: The battery comprises: Explosion-proof valve; A cover body and a shell, wherein the cover body and the shell are connected and enclose a receiving cavity, one of the cover body and the shell is provided with a mounting hole and a support platform, the explosion-proof valve is arranged in the mounting hole, the support platform is arranged at one side of the mounting hole along the first direction, and the support platform extends along the second direction; A plastic part, wherein the plastic part is arranged on a side of the cover body or the shell close to the accommodating cavity, and an end of the support platform along the third direction abuts against the plastic part; Along the first direction, a distance between a side of the support platform facing away from the mounting hole and an adjacent side edge of the cover body or the shell is A, and a value range of A is: 5mm≤A≤8mm.

2. The battery according to claim 1, characterized in that Along the second direction, the size of the mounting hole is B, the size of the support platform is C, and B and C satisfy: 1.5≤C / B≤2.0; Among them, the value range of B is: 20mm≤B≤60mm; The value range of C is: 30mm≤C≤120mm.

3. The battery according to claim 1, characterized in that Along the third direction, the height of the support platform is F, and the value range of F is 3mm≤F≤5mm.

4. The battery according to claim 1, characterized in that The mounting hole and the support platform are arranged on the cover body, the distance between the side of the support platform close to the mounting hole and the adjacent side of the mounting hole along the first direction is D, and the width of the cover body along the first direction is L2; D and L2 satisfy: 0.15≤D / L2≤0.35; Among them, the value range of D is: 6mm≤D≤15mm; The value range of L2 is: 35mm≤L2≤75mm.

5. The battery according to claim 4, characterized in that The width of the support platform along the first direction is E, and E and L2 satisfy: 0.15≤E / L2≤0.4; Among them, the value range of E is: 8mm≤E≤20mm.

6. The battery according to claim 1, characterized in that There are two support platforms, and the two support platforms are symmetrically arranged on both sides of the mounting hole along the first direction.

7. The battery according to claim 1, characterized in that The plastic part is provided with a plurality of vent holes, which are arranged at intervals on the plastic part. Along the third direction, the projections of the plurality of vent holes on the cover body or the shell at least partially overlap with the projections of the mounting holes on the cover body or the shell.

8. The battery according to claim 1, characterized in that A side of the plastic part facing the cover body or the shell is provided with an escape groove, and the support platform is embedded in the escape groove.

9. The battery according to claim 8, characterized in that The plastic part includes a plastic body, a first flange and a second flange. The first flange and the second flange are arranged on a side of the plastic body facing the cover body or the shell. The first flange is arranged around the circumference of the plastic body. The second flange is connected to the first flange. The second flange, the first flange and the plastic body form an avoidance groove.

10. The battery according to claim 9, characterized in that The plastic part is provided with supporting ribs, and the supporting ribs are connected to the first flange and / or the second flange.

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