A type of battery

Abstract

This invention relates to the field of battery technology, specifically disclosing a battery comprising an explosion-proof valve, a cover plate body, a shell, and a plastic component. The cover plate body is connected to the shell and together with the shell forms a cavity for housing the electrode assembly. The cover plate body or shell has mounting holes and multiple support platforms. The plastic component is disposed on the side of the cover plate body or shell near the cavity, and the ends of the support platforms facing away from the cover plate body or shell abut against the plastic component. This design ensures that even after thermal runaway and melting of the plastic component, the support platforms can continue to support the electrode assembly, preventing the electrode assembly from randomly flowing with the high-temperature, high-pressure gas and blocking the mounting holes on the cover plate body. This maintains a gap between the mounting holes on the cover plate body and the electrode assembly, facilitating the directional discharge of high-temperature, high-pressure gas from the explosion-proof valve located within the mounting holes, improving the venting effect of the explosion-proof valve, and enhancing the battery's safety.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a battery. Background Technology

[0002] Lithium-ion batteries have become representative of high-performance batteries due to their advantages such as high operating voltage, high specific energy, large capacity, low self-discharge, good cycle performance, long service life, light weight, and small size. The structure of a conventional lithium-ion battery includes a cover plate, a casing, electrode assembly, and insulating components. The cover plate and casing are welded together to form a sealed space protecting the electrode assembly. An explosion-proof valve is integrated into the cover plate, which can directionally discharge high-temperature, high-pressure gas from the sealed space in the event of thermal runaway. The insulating components are located within the sealed space formed by the casing and cover plate, and are positioned between the cover plate and the electrode assembly. On one hand, the insulating components support the electrode assembly, preventing it from wobbling within the casing, thus providing good fixation; on the other hand, the insulating components prevent short circuits between the electrode assembly and the cover plate, ensuring the electrical safety of the battery.

[0003] However, insulating components are generally made of plastic materials (such as PP), which have limited strength and high-temperature resistance, and typically melt at around 150°C. When a battery experiences thermal runaway, the temperature inside the sealed space is high, causing the insulating components to melt and fail. At this point, only the still-solid electrode assembly remains in the sealed space. The gap between the electrode assembly and the cover plate increases, and due to the lack of support from the insulating components, the electrode assembly has a high degree of freedom within the casing. When high-temperature, high-pressure gas is vented through the explosion-proof valve, the electrode assembly will move with the high-temperature, high-pressure gas flow, posing a risk of blocking the explosion-proof valve's venting passage, reducing the valve's venting efficiency, and resulting in low safety performance. Summary of the Invention

[0004] The purpose of this invention is to provide a battery that can prevent the explosion-proof valve from being blocked due to the movement of the electrode assembly when the battery experiences thermal runaway. The explosion-proof valve has high venting efficiency and good safety performance.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention provides a battery, comprising:

[0007] Explosion-proof valve;

[0008] The cover plate body and the housing are connected and form an accommodating cavity. One of the cover plate body and the housing is provided with a mounting hole and a plurality of support platforms. The explosion-proof valve is disposed in the mounting hole. The plurality of support platforms are disposed on both sides of the mounting hole along a first direction. The plurality of support platforms are spaced apart along the first direction. All the support platforms extend along a second direction.

[0009] A plastic part is disposed on the side of the cover plate body or the housing near the receiving cavity, and the end of the support platform away from the cover plate body or the housing in a third direction abuts against the plastic part;

[0010] Along the first direction, the sum of the dimensions of all the support platforms is L1, and the length of the cover plate body or the shell is L2. The relationship between L1 and L2 satisfies: 0.2≤L1 / L2≤0.4;

[0011] The value range of L1 is: 15mm≤L1≤80mm;

[0012] The value range of L2 is: 90mm≤L2≤200mm.

[0013] Optionally, a plurality of the support platforms are symmetrically arranged on both sides of the mounting hole along the first direction, the plurality of support platforms have the same size along the first direction, each support platform has a size of L11, and the number of support platforms is n;

[0014] The formula for calculating the sum of the dimensions of all the support platforms, L1, is: L1 = n·L11;

[0015] The value range of L11 is: 5mm≤L11≤10mm.

[0016] Optionally, the cover plate body is provided with the mounting hole and a plurality of the support platforms, and along the second direction, the distance between the end of the support platform in the length direction and the adjacent side of the cover plate body is A, and the width of the cover plate body is F;

[0017] The relationship between A and F satisfies: 0.12 ≤ A / F ≤ 0.2;

[0018] The range of values ​​for A is: 5mm ≤ A ≤ 10mm;

[0019] The value range of F is: 25mm≤F≤75mm.

[0020] Optionally, along the second direction, the size of the support platform is E, and the size of the mounting hole is G, wherein E and G satisfy the following condition: 1.5 ≤ E / G ≤ 2.0;

[0021] The value range of E is: 15mm≤E≤60mm;

[0022] The value range of G is: 8mm≤G≤30mm.

[0023] Optionally, along the first direction, the distance between the side of the support platform adjacent to the mounting hole that is close to the mounting hole and the adjacent side of the mounting hole is C;

[0024] The value range of C is: 8mm≤C≤15mm.

[0025] Optionally, along the first direction, the distance between the sides of two adjacent support platforms that are close to each other is B, and the value of B is in the range of 8mm≤B≤15mm.

[0026] Optionally, along the first direction, the distance between the support platform adjacent to the side of the cover plate body or the housing and the side is D, and the value of D is in the range of 8mm≤D≤25mm.

[0027] Optionally, the height of the support platform is H along a third direction;

[0028] The value of H is in the range of 3mm ≤ H ≤ 5mm.

[0029] Optionally, the plastic part is provided with a plurality of vent holes, which are arranged at intervals on the plastic part; along a third direction, the projections of the plurality of vent holes on the cover plate body or the housing at least partially coincide with the projections of the mounting holes on the cover plate body or the housing.

[0030] Optionally, the plastic part has a clearance groove on the side facing the cover plate body or the housing, and the support platform is embedded in the clearance groove.

[0031] The beneficial effects of this invention are as follows:

[0032] This invention provides a battery comprising an explosion-proof valve, a cover body, a housing, and a plastic component. The cover body is connected to the housing and together with the housing forms a cavity for housing an electrode assembly. The cover body or housing has mounting holes and multiple support platforms. The plastic component is disposed on the side of the cover body or housing near the cavity. The ends of the support platforms facing away from the cover body or housing abut against the plastic component, thereby insulating the cover body from the electrode assembly through the plastic component.

[0033] With the above settings, even after the battery experiences thermal runaway and the plastic parts melt, the support platform can continue to support the electrode assembly, preventing the electrode assembly from randomly flowing with the high-temperature and high-pressure gas and causing it to block the mounting holes on the cover plate body. This ensures that there is a gap between the mounting holes on the cover plate body and the electrode assembly, allowing the high-temperature and high-pressure gas to be directionally discharged from the explosion-proof valve installed in the mounting hole, improving the venting effect of the explosion-proof valve and ensuring high battery safety. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of the cover plate body and the plastic part provided in Embodiment 1 of the present invention;

[0036] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0037] Figure 3 This is a top view of the cover plate body provided in Embodiment 1 of the present invention;

[0038] Figure 4 This is a bottom view of the plastic part provided in Embodiment 1 of the present invention;

[0039] Figure 5 This is a schematic diagram of the battery structure provided in Embodiment 2 of the present invention;

[0040] Figure 6 This is a partial enlarged view of the battery provided in Embodiment 2 of the present invention.

[0041] In the picture:

[0042] 100, Cover plate 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, Clearance groove; 300, Housing; 310, First side wall; 320, Second side wall. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0045] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0046] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0047] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0050] like Figures 1-3 As shown, this embodiment provides a battery, which includes an explosion-proof valve, a cover plate body 100, a housing 300 and a plastic part 200. The cover plate body 100 is connected to the housing 300 and together with the housing 300 forms a cavity for placing the electrode assembly.

[0051] The cover plate body 100 is provided with mounting holes 110 and multiple support platforms 120. The explosion-proof valve is disposed in the mounting hole 110. The multiple support platforms 120 are distributed on both sides of the mounting hole 110 along a first direction, and are spaced apart along the first direction. All support platforms 120 extend along a second direction. A plastic part 200 is disposed on the side of the cover plate body 100 near the receiving cavity. The ends of the support platforms 120 away from the cover plate body 100 along a third direction abut against the plastic part 200, thereby insulating the cover plate body 100 from the electrode assembly. The first direction is the length direction of the cover plate body 100, i.e. Figure 1 The X-axis direction shown is the second direction, which is the width direction of the cover plate body 100, that is... Figure 1 The Y-axis direction shown in the figure represents the height direction of the cover plate body 100, that is... Figure 1 The Z-axis direction is shown in the figure.

[0052] With the above-described configuration, even after thermal runaway of the battery and melting of the plastic component 200, the multiple support platforms 120 on the cover body 100 can continue to support the electrode assembly. This prevents the electrode assembly from randomly flowing with the high-temperature, high-pressure gas, which would otherwise block the mounting holes 110 on the cover body 100. It ensures a gap between the mounting holes 110 and the electrode assembly, facilitating the directional discharge of high-temperature, high-pressure gas from the explosion-proof valve located within the mounting holes 110, thus improving the venting effect of the explosion-proof valve. It should be noted that the explosion-proof valve is in the open position at this time.

[0053] Optionally, along the first direction, the sum of the dimensions of all support platforms 120 is L1, and the length of the cover body 100 is L2. The relationship between L1 and L2 satisfies: 0.2 ≤ L1 / L2 ≤ 0.4. For example, the value of L1 / L2 can be 0.20, 0.25, 0.30, 0.35, or 0.40. The range of L1 is: 15mm ≤ L1 ≤ 80mm, and the range of L2 is: 90mm ≤ L2 ≤ 200mm. That is, when the value of L1 is 15mm, the value of L2 can be 38mm, 50mm, 60mm, 70mm, or 75mm, etc. When the value of L1 is 40mm, the value of L2 can be 100mm, 130mm, 160mm, or 200mm, etc. When the value of L1 is 80mm, the value of L2 can be 90mm, 105mm, or 120mm.

[0054] By controlling the values ​​of L1 / L2 within the aforementioned range, a large venting space can be ensured between the cover plate body 100 and the electrode assembly, while the support platform 120 can provide excellent support for the electrode assembly. When the battery experiences thermal runaway and the plastic part 200 melts and fails, the electrode assembly moves towards the cover plate body 100 under the impact of high temperature and high pressure gas. The multiple support platforms 120 spaced apart on the cover plate body 100 can effectively block the electrode assembly, preventing the mounting holes 110 on the cover plate body 100 from being blocked, reducing the venting efficiency of the explosion-proof valve, and greatly improving the safety performance of the battery.

[0055] As an optional technical solution, multiple support platforms 120 are formed on the cover plate body 100 by stamping. The multiple support platforms 120 are symmetrically arranged on both sides of the mounting hole 110 along the first direction. The dimensions of the multiple support platforms 120 along the first direction are equal, and the dimension of each support platform 120 is L11. The number of support platforms 120 is n. The formula for calculating the sum of the dimensions of all support platforms 120, L1, is: L1 = n·L11.

[0056] The value range of L11 is: 5mm ≤ L11 ≤ 10mm. For example, the value of L11 can be 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm, etc. By limiting the value of L11 to the above range, the contact area between each support platform 120 and the electrode assembly is larger, ensuring that the support platform 120 provides good support for the electrode assembly, and the support platform 120 is not too sharp, making it easy to stamp and form. Otherwise, if the value of L11 is too small, the support effect of the support platform 120 on the electrode assembly will decrease, posing a risk that the electrode assembly will block the mounting holes 110 on the cover plate body 100, causing poor ventilation of the explosion-proof valve, and making it difficult to stamp and form the support platform 120 on the cover plate body 100, resulting in a low processing yield.

[0057] Furthermore, a limiting flange 111 is provided on the inner wall of the mounting hole 110. The explosion-proof valve can be inserted into the mounting hole 110 from one side of the cover plate body 100 and abut against the limiting flange 111 on the inner wall of the mounting hole 110. At this point, it indicates that the explosion-proof valve is installed in place, and the explosion-proof valve can be welded to the cover plate body 100. The setting of the limiting flange 111 ensures accurate positioning between the explosion-proof valve and the cover plate body 100, resulting in high assembly precision. In addition, the limiting flange 111 can also temporarily fix the explosion-proof valve, facilitating the welding operation between the explosion-proof valve and the cover plate body 100.

[0058] See also Figure 3Along the second direction, the distance between the end of the support platform 120 and the adjacent side of the cover plate body 100 is A, and the width of the cover plate body 100 is F. A and F satisfy the condition: 0.12 ≤ A / F ≤ 0.2. For example, the value of A / F can be 0.12, 0.14, 0.16, 0.18, or 0.20, etc. The range of A is: 5mm ≤ A ≤ 10mm, and the range of F is: 25mm ≤ F ≤ 75mm. That is, when the value of A is 5mm, the value of F can be 25mm, 30mm, 35mm, 40mm, or 42mm, etc. When the value of A is 10mm, the value of F can be 50mm, 60mm, 70mm, or 75mm, etc.

[0059] By limiting the A / F value within the aforementioned range, a certain space is ensured between the support platform 120 and the side of the cover plate body 100 along the second direction. This facilitates the assembly of the cover plate body 100 and the housing 300, avoids interference between the support platform 120 and the housing 300, and also reduces the resistance when high-temperature, high-pressure gas flows along the first direction, allowing it to be discharged to the mounting hole 110, ensuring smooth opening of the explosion-proof valve and relatively unobstructed exhaust. It is important to note that the A / F value should not be too small; otherwise, the flow of high-temperature, high-pressure gas along the first direction will be obstructed, and the explosion-proof valve may fail to open in time, posing a safety risk. Conversely, the A / F value should not be too large; otherwise, the dimensions of each support platform 120 along the second direction will be too small, resulting in poor support for the electrode assembly. There is a risk that the mounting hole 110 on the cover plate body 100 may be blocked by the electrode assembly, hindering the exhaust of the explosion-proof valve.

[0060] Furthermore, along the second direction, the dimension of the support platform 120 is E, and the dimension of the mounting hole 110 is G, where E and G satisfy the condition: 1.5 ≤ E / G ≤ 2.0; for example, the value of E / G can be 1.5, 1.6, 1.7, 1.8, 1.9, or 2.0. Specifically, the range of E is: 15mm ≤ E ≤ 60mm, and the range of G is: 8mm ≤ G ≤ 30mm. That is, when the value of E is 15mm, the value of G can be 8.5mm, 9.5mm, or 10.0mm. When the value of E is 30mm, the value of G can be 15mm, 18mm, or 20mm. When the value of E is 60mm, the value of G can be 30mm.

[0061] By controlling the E / G value within the aforementioned range, a large contact area between the support platform 120 and the electrode assembly is ensured, resulting in good support for the electrode assembly, unobstructed mounting holes 110 on the cover plate body 100, and smooth exhaust from the explosion-proof valve. Conversely, if the E / G value is too small, the support platform 120's dimensions along the second direction will be small, leading to poor support for the electrode assembly, obstruction of the mounting holes 110 on the cover plate body 100, poor exhaust from the explosion-proof valve, reduced exhaust efficiency, and a higher risk of explosion. Conversely, the E / G value should not be too large either; otherwise, an excessively large dimensions of the support platform 120 along the second direction will create resistance to the high-temperature, high-pressure gas flowing along the first direction, reducing the exhaust efficiency of the explosion-proof valve and compromising safety.

[0062] See Figure 3 Along the first direction, the distance C between the side of the support platform 120 adjacent to the mounting hole 110 closest to the mounting hole 110 and the adjacent side of the mounting hole 110 is defined as follows: C ≤ 8mm ≤ C ≤ 15mm. For example, the value of C can be 8mm, 10mm, 12mm or 15mm.

[0063] By controlling the value of C within the aforementioned range, it can be ensured that after the support platform 120 is stamped, the flatness of the surrounding area of ​​the mounting hole 110 on the cover plate body 100 is good, the assembly accuracy between the explosion-proof valve and the cover plate body 100 is high, the reliability of the explosion-proof valve is high, and it is not prone to failure. Otherwise, if the value of C is too small, the distance between the support platform 120 and the mounting hole 110 is too close, the flatness of the surrounding area of ​​the mounting hole 110 on the cover plate body 100 is poor, affecting the welding quality between the explosion-proof valve and the cover plate body 100, and posing a risk of sealing failure. Of course, the value of C should not be too large either, otherwise the distance between the support platform 120 and the mounting hole 110 will be too large, the support effect of the electrode assembly will decrease, and there is a risk that the electrode assembly will block the mounting hole 110 on the cover plate body 100.

[0064] Furthermore, along the first direction, the distance between the sides of two adjacent support platforms 120 that are close to each other is denoted by B, and the value of B is in the range of 8mm ≤ B ≤ 15mm. For example, the value of B can be 8mm, 10mm, 12mm, or 15mm. By controlling the value of B within the above range, it can be ensured that the support platform 120 is smoothly stamped on the cover plate body 100, and the flatness of the position on the cover plate body 100 where the support platform 120 is not set is good. Otherwise, if the value of B is too small, the distance between two adjacent support platforms 120 is too close, making it difficult to process and form, resulting in a low forming yield, and the flatness of the cover plate body 100 after forming is also poor, affecting the welding quality when the cover plate body 100 is welded to the shell 300, and posing a risk of sealing failure. Of course, the value of B should not be too large either, otherwise the distance between two adjacent support platforms 120 will be too large, reducing the support effect on the pole group, and posing a risk that the pole group will block the mounting holes 110 on the cover plate body 100.

[0065] Along the first direction, the distance between the support platform 120 adjacent to the side of the cover plate body 100 and that side is denoted by D, where D ranges from 8mm to 25mm. For example, the value of D can be 8mm, 12mm, 16mm, 20mm, or 25mm. By controlling the value of D within the above range, on the one hand, a certain space is ensured between the support platform 120 and the side of the cover plate body 100 along the first direction, facilitating the assembly of the cover plate body 100 and the housing 300. On the other hand, it also ensures that the support platform 120 is smoothly stamped on the cover plate body 100, and that the flatness of the area on the cover plate body 100 without the support platform 120 is good. Otherwise, if the value of D is too small, interference may occur when assembling the cover plate body 100 and the housing 300, resulting in a lower assembly yield. Furthermore, the support platform 120 is difficult to process and form, leading to poor flatness of the cover plate body 100 after forming, which affects the welding quality when welding the cover plate body 100 and the housing 300, posing a risk of seal failure. Of course, the value of D should not be too large, otherwise the support effect of the support platform 120 on the pole group will decrease, and there is a risk that the pole group will block the mounting holes 110 on the cover plate body 100.

[0066] See also Figure 2 Along the third direction, in this embodiment, the height of the support platform 120 is H, and the value of H is in the range of 3mm ≤ H ≤ 5mm. For example, the value of H can be 3mm, 4mm, or 5mm, etc. By limiting the value of H to the above range, when the plastic part 200 is melted and the cover plate body 100 abuts against the electrode assembly, the exhaust space enclosed between the cover plate body 100 and the electrode assembly is larger, which is beneficial to improving the exhaust efficiency of the explosion-proof valve and ensuring high safety.

[0067] See Figure 1 and Figure 4 In this embodiment, the plastic part 200 is provided with a plurality of vent holes 211, which are spaced apart on the plastic part 200. Along a third direction, the projections of the plurality of vent holes 211 on the cover plate body 100 at least partially coincide with the projections of the mounting holes 110 on the cover plate body 100. After the battery experiences thermal runaway, before the internal temperature of the battery rises to the melting point of the plastic part 200, the plastic part 200 maintains its pre-melting form to support the electrode assembly. 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.

[0068] Furthermore, the plastic part 200 has a relief groove 231 on the side facing the cover plate body 100, and the support platform 120 is embedded in the relief groove 231. By setting the relief groove 231, the waste of space in the accommodating cavity can be avoided, the space occupied by the cover plate body 100 can be reduced, which is conducive to increasing the volume of the electrode assembly and improving the energy density of the battery.

[0069] Optionally, the plastic part 200 in this embodiment includes a plastic part body 210, a first flange 220, and a second flange 230. Both the first flange 220 and the second flange 230 are disposed on the side of the plastic part body 210 facing the cover plate body 100. The first flange 220 is circumferentially disposed around the plastic part body 210, and the second flange 230 extends along a second direction, with its two ends connected to the first flange 220. Multiple second flanges 230 are spaced apart along the first direction, wherein the plastic part body 210 between two second flanges 230 located at the middle position along the first direction has multiple ventilation holes 211. On one hand, the second flange 230, the first flange 220, and the plastic part body 210 together form a clearance groove 231, and one or more support platforms 120 can be disposed within each clearance groove 231. In this embodiment, two support platforms 120 are disposed within each clearance groove 231 as an example. On the other hand, the second flange 230 can also increase the mechanical strength of the plastic part 200, ensuring that the plastic part 200 provides good support for the cover plate body 100 and the electrode assembly, and that the electrode assembly is well fixed in the housing 300 and not easily shaken.

[0070] The following uses samples of different design sizes to verify the thermal runaway values ​​of relevant parameters L1, L2, L1 / L2, and L11 of the cover body 100 of the battery. The verification results are shown in Table 1.

[0071] Table 1

[0072]

[0073] The results above show that the cover plate body 100 of samples 1 to 7 is provided with a support platform 120. The relevant parameters L1, L2, L1 / L2, and L11 of the cover plate body 100 all meet their respective size limits. At this time, the support platform 120 has a significant supporting effect on the electrode group. The flow space formed between the cover plate body 100 and the electrode group is large, the explosion-proof valve exhaust is smooth, the exhaust efficiency is high, there is no risk of explosion, and the battery product is good.

[0074] Although the cover body 100 of samples 8 to 10 is provided with a support platform 120, its L1 / L2 value is too small, less than the minimum value of the size range 0.2≤L1 / L2≤0.4. The size of the support platform 120 along the first direction is small, and the contact area with the electrode group is small. After the battery experiences thermal runaway and the plastic part 200 is melted, the support effect of the cover body 100 on the electrode group is not good. 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, which poses a certain risk of explosion. The safety is low, and the battery product is defective.

[0075] The cover body 100 of samples 11 and 12 is provided with a support platform 120, but its L1 / L2 value is too large, exceeding the maximum value of the size range 0.2≤L1 / L2≤0.4. The support platform 120 occupies too much space. After the battery experiences thermal runaway and the plastic part 200 is melted, the exhaust space formed between the cover body 100 and the electrode group is small. The exhaust efficiency of the explosion-proof valve is low, which poses a certain risk of explosion, resulting in low safety and defective battery products.

[0076] The following uses samples of different design sizes to verify the thermal runaway values ​​of the relevant parameters C, A, F, and A / F of the cover plate body of the above-mentioned battery. The verification results are shown in Table 2.

[0077] Table 2

[0078]

[0079] The results above show that the cover plate body 100 of samples 1 to 7 is provided with a support platform 120. The relevant parameters C, A, F and A / F of the cover plate body 100 all meet the corresponding size limits. At this time, the support platform 120 has a significant supporting effect on the electrode group. The flow space formed between the cover plate body 100 and the electrode group is large, the explosion-proof valve exhaust is smooth and the exhaust efficiency is high. There is no risk of explosion, and the battery product is good.

[0080] Although the cover body 100 of samples 8 and 9 is equipped with a support platform 120, the value of its parameter C is too large, exceeding the maximum value of its size range of 8mm≤C≤15mm. The distance between the support platform 120 and the mounting hole 110 along the first direction is too large. After the battery experiences thermal runaway and the plastic part 200 is melted, the support platform 120 does not provide good support for the electrode assembly. The mounting hole 110 on the cover body 100 may still be blocked by the electrode assembly. The explosion-proof valve has low exhaust efficiency, which poses a certain risk of explosion and low safety, resulting in defective battery products.

[0081] Although the cover plate body 100 of samples 10 and 11 is equipped with a support platform 120, the value of its parameter C is too small, less than the minimum value of its size range 8mm≤C≤15mm. The support platform 120 affects the flatness of the cover plate body 100 during stamping and forming, and is prone to deformation at the mounting hole 110, resulting in poor assembly accuracy between the explosion-proof valve and the mounting hole 110, making the explosion-proof valve prone to failure and the battery product defective.

[0082] The cover body 100 of samples 12 and 13 is provided with a support platform 120, but its A / F value is too large, exceeding the maximum value of the size range 0.12≤A / F≤0.2. After the battery experiences thermal runaway and the plastic part 200 is melted, the support platform 120 does not provide good support for the electrode group. The explosion-proof valve is partially blocked by the electrode group, resulting in low venting efficiency, low safety, and defective battery products.

[0083] The cover body 100 of samples 14 and 15 is provided with a support platform 120, but its A / F value is too small, less than the minimum value of the size range 0.12≤A / F≤0.2. After the battery thermal runaway and the plastic part 200 is melted, the support platform 120 blocks the high temperature and high pressure gas flowing in the first direction, resulting in poor gas flow and the explosion-proof valve failing to open in time, which poses a certain risk of explosion, low safety, and defective battery products.

[0084] In summary, it is evident that the size design and position arrangement of the support platform 120 have a significant impact on the electrode assembly support effect and the explosion-proof valve venting effect. When the size design specified in this embodiment is adopted, it can be ensured that the support platform 120 provides good support for the electrode assembly, while the explosion-proof valve venting is not affected, which greatly improves the pass rate of battery thermal runaway test and ensures high battery safety performance.

[0085] Example 2

[0086] This embodiment also provides a battery, which differs from the battery in Embodiment 1 in that: in this embodiment, the mounting hole 110 and multiple support platforms 120 are disposed on one of the side walls of the housing 300.

[0087] See Figure 5 and Figure 6 In this embodiment, the battery can be a blade battery, and the casing 300 is along the first direction ( Figure 5 Both ends of the cover plate body 100 (shown in the X-axis direction) are formed with openings. There are two cover plate bodies 100. Each cover plate body 100 is connected to an opening of the housing 300 and blocks the opening. The two cover plate bodies 100 and the housing 300 form a cavity for placing the electrode assembly.

[0088] The housing 300 includes two first sidewalls 310 disposed opposite each other along a third direction, and a second sidewall 310 disposed opposite each other along a second direction. Figure 5 Two second sidewalls 320 are arranged opposite each other (in the Y-axis direction shown in the diagram). A first sidewall 310 is connected to the second sidewall 320, and the area of ​​the first sidewall 310 is smaller than the area of ​​the second sidewall 320. In this embodiment, the mounting hole 110 and the support platform 120 are provided on the first sidewall 310 as an example. A plastic part 200 is provided on the side of the first sidewall 310 near the receiving cavity. The support platform 120 abuts against the plastic part 200 on the side away from the first sidewall 310 in a third direction. The plastic part 200 insulates the electrode assembly from the housing 300.

[0089] Multiple support platforms 120 are positioned on both sides of the mounting hole 110 along a first direction, and the support platforms 120 are spaced apart along the first direction. All support platforms 120 extend along a second direction. Along the first direction, the sum of the dimensions of all support platforms 120 is L1, and the length of the first sidewall 310 of the housing 300 is L2. The relationship between L1 and L2 satisfies: 0.2 ≤ L1 / L2 ≤ 0.4. Specifically, the value range of L1 is 15mm ≤ L1 ≤ 80mm, and the value range of L2 is 90mm ≤ L2 ≤ 200mm.

[0090] By controlling the values ​​of L1 / L2 within the aforementioned range, a large venting space can be ensured between the housing 300 and the electrode assembly, while the support platform 120 provides excellent support for the electrode assembly. When the battery experiences thermal runaway and the plastic part 200 melts and fails, the electrode assembly moves towards the first sidewall 310 of the housing 300 under the impact of high-temperature and high-pressure gas. The multiple support platforms 120 spaced apart on the first sidewall 310 can effectively block the electrode assembly, preventing the mounting holes 110 on the housing 300 from being blocked, thus affecting the venting efficiency of the explosion-proof valve and greatly improving the battery's safety performance.

[0091] Optionally, the plastic part 200 is provided with a plurality of vent holes 211, which are spaced apart on the plastic part 200. Along a third direction, the projections of the plurality of vent holes 211 on the first sidewall 310 of the housing 300 at least partially coincide with the projections of the mounting holes 110 on the first sidewall 310 of the housing 300. After the battery experiences thermal runaway, before the internal temperature of the battery rises to the melting point of the plastic part 200, the plastic part 200 maintains its pre-melting shape to support the electrode assembly. 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.

[0092] Furthermore, the plastic part 200 has a clearance groove 231 on the side facing the first sidewall 310 of the housing 300, and the support platform 120 is embedded in the clearance groove 231. By setting the clearance groove 231, the waste of space in the accommodating cavity can be avoided, the space occupied can be reduced, the volume of the electrode assembly can be increased, and the energy density of the battery can be improved.

[0093] The remaining structure of the battery in this embodiment is the same as that in Embodiment 1, and will not be described again here.

[0094] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery, characterized in that, include: Explosion-proof valve; The cover plate body and the housing are connected and form an accommodating cavity. The cover plate body is provided with a mounting hole and a plurality of support platforms. The explosion-proof valve is disposed in the mounting hole. The plurality of support platforms are disposed on both sides of the mounting hole along a first direction. The plurality of support platforms are spaced apart along the first direction. All the support platforms extend along a second direction. The first direction is the length direction of the cover plate body, and the second direction is the width direction of the cover plate body. A plastic component is disposed on the side of the cover plate body near the receiving cavity. The end of the support platform away from the cover plate body along a third direction abuts against the plastic component, where the third direction is the height direction of the cover plate body. Along the first direction, the sum of the dimensions of all the support platforms is L1, and the length of the cover plate body is L2. The relationship between L1 and L2 satisfies: 0.2≤L1 / L2≤0.4; The value range of L1 is: 15mm≤L1≤80mm; The value range of L2 is: 90mm≤L2≤200mm; Along the second direction, the distance between the end of the support platform along its length and the adjacent side of the cover plate body is A, and the width of the cover plate body is F; The relationship between A and F satisfies: 0.13 ≤ A / F ≤ 0.2; The range of values ​​for A is: 5mm ≤ A ≤ 10mm; The range of F is: 25mm≤F≤75mm; Along the first direction, the distance between the side of the support platform adjacent to the mounting hole and the adjacent side of the mounting hole is C, and the value of C is in the range of 8mm≤C≤15mm.

2. The battery according to claim 1, characterized in that, The plurality of support platforms are symmetrically arranged on both sides of the mounting hole along the first direction, the plurality of support platforms have the same size along the first direction, each support platform has a size of L11, and the number of support platforms is n; The formula for calculating the sum of the dimensions of all the support platforms, L1, is: L1 = n·L11; The value range of L11 is: 5mm≤L11≤10mm.

3. The battery according to claim 1, characterized in that, Along the second direction, the size of the support platform is E, and the size of the mounting hole is G, wherein E and G satisfy the following condition: 1.5 ≤ E / G ≤ 2.0; The value range of E is: 15mm≤E≤60mm; The value range of G is: 8mm≤G≤30mm.

4. The battery according to claim 1, characterized in that, Along the first direction, the distance between the two adjacent support platforms on their closest sides is B, and the value of B is in the range of 8mm≤B≤15mm.

5. The battery according to claim 1, characterized in that, Along the first direction, the distance between the support platform adjacent to the side of the cover plate body and the side is D; The value range of D is: 8mm≤D≤25mm.

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

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 a third direction, the projections of the plurality of vent holes on the cover plate body and the projections of the mounting holes on the cover plate body at least partially coincide.

8. The battery according to claim 1, characterized in that, The plastic part has a clearance groove on the side facing the cover plate body, and the support platform is embedded in the clearance groove.

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