Cover plate assembly and single battery

Abstract

The invention discloses a cover plate assembly and a single battery, and belongs to the technical field of batteries, the cover plate assembly comprises: a cover plate body having a connecting hole; the anti-explosion valve covers and seals the connecting hole and is connected with the cover plate body; the insulating part comprises a first connecting part, the first connecting part is located on one side, in the thickness direction, of the cover plate body and connected with the cover plate body, the first connecting part, the cover plate body and the anti-explosion valve define an overflowing cavity, and the first connecting part is provided with a first through hole communicated with the overflowing cavity. When the battery vibrates, free electrolyte in the battery impacts on the first connecting part, the first connecting part plays a certain buffering role on the electrolyte, part of the electrolyte enters the first cavity through the first through hole and impacts on the separator, the separator further buffers the part of the electrolyte, and the part of the electrolyte is separated from the first cavity. And the impact force of the electrolyte is reduced, and the impact force of the electrolyte is weakened for multiple times, so that the acting force acting on the anti-explosion valve is very small, and the anti-explosion valve cannot crack and lose efficacy.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and in particular relates to a cover plate assembly and a single cell. Background Art

[0002] In order to improve the safety of the battery during use, an explosion-proof valve structure is often set on the cover. As the current battery capacity increases, the amount of electrolyte injected into the battery also gradually increases. The battery will vibrate during testing or use. Excessive free electrolyte in the battery will impact the explosion-proof valve, which may cause the explosion-proof valve to crack and fail. Summary of the invention

[0003] Purpose of the invention: An embodiment of the present application provides a cover plate assembly, aiming to overcome the technical problem that the free electrolyte inside the battery impacts the explosion-proof valve, causing the explosion-proof valve to crack and fail; another purpose of the embodiment of the present application is to provide a single cell.

[0004] Technical solution: A cover plate assembly described in an embodiment of the present application includes:

[0005] The cover plate body has a connection hole;

[0006] An explosion-proof valve, covering the connection hole and connected to the cover plate body;

[0007] The insulating member includes a first connecting portion, the first connecting portion is located on one side of the cover body along the thickness direction and is connected to the cover body, the first connecting portion, the cover body and the explosion-proof valve are enclosed to form a flow cavity, and the first connecting portion has a first through hole connected to the flow cavity;

[0008] A separator is located in the flow chamber and connected to the first connecting portion, the separator divides the flow chamber into a first cavity and a second cavity which are spaced apart along the thickness direction, the separator has a second through hole connecting the first cavity and the second cavity, and the orthographic projection of the second through hole on the first connecting portion along the thickness direction is at least partially located outside the first through hole.

[0009] In some embodiments, the cover plate assembly satisfies: 0.4≤S1 / S2≤1;

[0010] Wherein, S1 is the total area of ​​the portion of the second through hole that is offset from the first through hole along the thickness direction, and S2 is the total area of ​​the second through hole.

[0011] In some embodiments, the first connecting portion has a plurality of first through holes arranged at intervals, the partition has a plurality of second through holes arranged at intervals, and the orthographic projection of each second through hole on the first connecting portion along the thickness direction is at least partially located outside one of the first through holes.

[0012] In some embodiments, the cover plate assembly further comprises:

[0013] A support member is located in the first cavity, the support member extends along the thickness direction and is respectively connected to the first connecting portion and the partition, the orthographic projection of the support member along the thickness direction on the first connecting portion is located outside the first through hole; the orthographic projection of the support member along the thickness direction on the partition is located outside the second through hole.

[0014] In some embodiments, at least a portion of the support member extends along the length direction of the cover body and is connected to the first connecting portion, for supporting the first connecting portion in the length direction, and / or, at least a portion of the support member extends along the width direction of the cover body and is connected to the first connecting portion, for supporting the first connecting portion in the width direction.

[0015] In some embodiments, the first connecting portion, the partition and the support member are an integrated structure.

[0016] In some embodiments, the cover body has a liquid injection hole, and the insulating member includes a second connecting portion, which is located on a side of the cover body facing the first connecting portion and is connected to the cover body;

[0017] The second connecting part and the cover body are combined to form a buffer cavity, and the buffer cavity is connected to the injection hole. The second connecting part has a third through hole connected to the buffer cavity. Along the thickness direction of the cover body, the orthographic projection of the injection hole on the second connecting part is located outside the third through hole.

[0018] In some embodiments, the cover plate assembly includes:

[0019] a reinforcement member located in the buffer cavity, wherein at least a portion of the reinforcement member extends along the length direction of the cover plate body and is connected to the second connection portion, and is used to support the second connection portion in the length direction, and / or at least a portion of the reinforcement member extends along the width direction of the cover plate body and is connected to the second connection portion, and is used to support the second connection portion in the width direction;

[0020] Along the thickness direction of the cover plate body, the orthographic projection of the reinforcement member on the second connecting portion is located outside the third through hole.

[0021] In some embodiments, at least a portion of the reinforcement extends along a thickness direction of the cover plate body and is respectively connected to the cover plate body and the second connection portion.

[0022] A single battery, comprising:

[0023] A housing having a placement cavity;

[0024] An electrode assembly is disposed in the placement cavity;

[0025] The cover plate assembly described in any one of the above is configured to cover the placement cavity and be connected to the shell.

[0026] Beneficial effects: The cover assembly of the embodiment of the present application includes: a cover body, which has a connecting hole; an explosion-proof valve, which seals the connecting hole and is connected to the cover body; an insulating member, which includes a first connecting part, which is located on one side of the cover body along the thickness direction and is connected to the cover body, the first connecting part, the cover body and the explosion-proof valve are combined to form a flow cavity, and the first connecting part has a first through hole connected to the flow cavity; a separator, which is located in the flow cavity and is connected to the first connecting part, the separator divides the flow cavity into a first cavity and a second cavity arranged at intervals along the thickness direction, the separator has a second through hole connecting the first cavity and the second cavity, and the orthographic projection of the second through hole on the first connecting part along the thickness direction is at least partially located outside the first through hole. When the battery vibrates, the free electrolyte inside it will impact on the first connection part, and the first connection part will play a certain buffering role on the electrolyte. Some of the electrolyte will enter the first cavity through the first through hole and impact on the separator. The separator will further buffer this part of the electrolyte and reduce the impact force of the electrolyte. The orthographic projection of the second through hole on the separator along the thickness direction on the first connection part is at least partially located outside the first through hole, which means that at most a part of the electrolyte entering the first cavity will impact on the explosion-proof valve through the second through hole. Due to the multiple weakening of the impact force of the electrolyte, the force acting on the explosion-proof valve is very small, and the explosion-proof valve will not be cracked and fail. If the orthographic projection of the second through hole on the first connection part along the thickness direction is completely outside the first through hole, the electrolyte entering the first cavity will all impact on the separator, and will not impact the explosion-proof valve, and will not cause the explosion-proof valve to crack and fail. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a front cross-sectional view of the cover plate assembly of the embodiment of the present application;

[0029] Figure 2 For the embodiment of this application Figure 1 A partial enlarged view of area A in the middle;

[0030] Figure 3 This is an internal cross-sectional view of the first connecting portion of the embodiment of the present application, wherein a support member is provided inside the flow chamber;

[0031] Figure 4 This is a front perspective view of an insulating member according to an embodiment of the present application;

[0032] Figure 5 A partial cross-sectional perspective view of an insulating member according to an embodiment of the present application;

[0033] Figure 6 It is a partial cross-sectional stereoscopic view of an insulating member according to an embodiment of the present application, wherein the separator is not shown;

[0034] Figure 7 This is a reverse perspective view of an insulating member according to an embodiment of the present application;

[0035] Figure 8 For the embodiment of this application Figure 1 A partial enlarged view of area B in the middle;

[0036] Fig. 9 This is an internal cross-sectional view of the second connecting portion of the embodiment of the present application;

[0037] Figure markings: 10-cover body; 11-connecting hole; 20-explosion-proof valve; 30-insulating member; 31-first connecting part; 311-first through hole; 32-flow chamber; 321-first cavity; 322-second cavity; 33-second connecting part; 331-third through hole; 34-buffer chamber; 40-partition; 41-second through hole; 50-support member; 60-liquid injection hole; 70-reinforcement member; X-thickness direction; Y-length direction; Z-width direction. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0039] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "plurality" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined.

[0040] In order to improve the safety of batteries during use, explosion-proof valve structures are often installed on them. The purpose is: when the battery has thermal runaway or short circuit, a large amount of gas will be generated inside. At this time, the explosion-proof valve will open in time to release pressure to avoid more serious problems such as battery fire and explosion. With the increase of current battery capacity, the amount of electrolyte injected into the battery is also gradually increasing. In some national standard tests such as vibration and shock or during normal use, there is too much free electrolyte in the battery. Under the action of vibration, the electrolyte will impact the explosion-proof valve (there are notches on the explosion-proof valve, and the notches are the weakest part), which may cause the explosion-proof valve to crack and fail, and fail to protect the battery.

[0041] In view of this, an embodiment of the present application provides a cover assembly to overcome at least one of the above-mentioned technical problems.

[0042] See also Figure 1 , Figure 2 , Figure 4 and Figure 7 In an embodiment of the present application, the cover assembly includes a cover body 10, an explosion-proof valve 20, an insulating member 30 and a partition 40.

[0043] The cover body 10 has a connection hole 11. The explosion-proof valve 20 covers the connection hole 11 and is connected to the cover body 10. The insulating member 30 includes a first connection portion 31, which is located on one side of the cover body 10 along the thickness direction X and is connected to the cover body 10. The first connection portion 31, the cover body 10, and the explosion-proof valve 20 enclose a flow cavity 32, and the first connection portion 31 has a first through hole 311 connected to the flow cavity 32. The separator 40 is located in the flow cavity 32 and is connected to the first connection portion 31. The separator 40 divides the flow cavity 32 into a first cavity 321 and a second cavity 322 spaced apart along the thickness direction X. The first cavity 321 is connected to the first through hole 311. The separator 40 has a second through hole 41 connecting the first cavity 321 and the second cavity 322. The orthographic projection of the second through hole 41 on the first connection portion 31 along the thickness direction X is at least partially located outside the first through hole 311.

[0044] It is understandable that the battery has free electrolyte inside, and the electrolyte is generally located inside the battery shell, that is, on the side of the insulating member 30 away from the cover body 10. When the battery is subjected to a vibration impact test or in normal use, the free electrolyte inside it will shake, thereby impacting the side of the insulating member 30 away from the cover body 10. The free electrolyte impacts the first connection part 31 of the insulating member 30, and the first connection part 31 will play a certain buffering role on the electrolyte. Some of the electrolyte will enter the first cavity 321 through the first through hole 311 on the first connection part 31, and impact on the separator 40, and the separator 40 will further buffer this part of the electrolyte to reduce the impact force of the electrolyte. The orthographic projection of the second through hole 41 on the separator 40 on the first connection part 31 along the thickness direction X is at least partially located outside the first through hole 311, and the second through hole 41 is partially misaligned with the first through hole 311 in the thickness direction X, or completely misaligned. This means that at most a portion of the electrolyte that enters the first cavity 321 along the thickness direction X impacts the explosion-proof valve 20 through the second through hole 41. Due to the multiple weakening of the impact force of the electrolyte, the force of the electrolyte acting on the explosion-proof valve 20 is very small, and the explosion-proof valve 20 will not be cracked and fail. If the orthographic projection of the second through hole 41 on the first connecting portion 31 along the thickness direction X is completely outside the first through hole 311, the electrolyte that enters the first cavity 321 will all impact on the separator 40, and the electrolyte will not impact the explosion-proof valve 20, and the explosion-proof valve 20 will not be cracked and fail. During the battery vibration process, even if part of the electrolyte enters the second cavity 322, when the electrolyte in the second cavity 322 shakes with the vibration of the battery, due to the small internal space of the second cavity 322 and the space limitation, the impact force generated by the shaking of the electrolyte in the second cavity 322 is also small, and the explosion-proof valve 20 will not be damaged, nor will the explosion-proof valve 20 be cracked and fail. The first through hole 311 on the first connecting portion 31 and the second through hole 41 on the separator 40 are provided to facilitate the discharge of gas inside the battery when thermal runaway occurs in the battery, so that the gas generated inside the battery shell can break open the explosion-proof valve 20 through the first through hole 311 and the second through hole 41 to relieve the pressure inside the battery.

[0045] Since the first connection part 31 is a hollow structure with a flow cavity 32 arranged inside, the partition 40 is arranged in the flow cavity 32, so that the first connection part 31 can be supported in the length direction Y and the width direction Z of the cover body 10, thereby improving the compressive strength of the first connection part 31 in the length direction Y and the width direction Z, avoiding it from being easily deformed by external force during assembly or use, and ensuring the stability of the first connection part 31 during use.

[0046] See also Figure 1 and Figure 2 In combination with the above embodiments, in some embodiments, the cover plate assembly satisfies: 0.4≤S1 / S2≤1. Wherein, S1 is the total area of ​​the misaligned portion of the second through hole 41 and the first through hole 311 along the thickness direction X, and S2 is the total area of ​​the second through hole 41. It can be understood that if the second through hole 41 and the first through hole 311 are completely misaligned in the thickness direction X, the orthographic projection of the second through hole 41 on the first connecting portion 31 along the thickness direction X will completely fall on the bottom wall of the first cavity 321 (that is, the projection of the second through hole 41 along the thickness direction X will completely fall on the first connecting portion 31); if the second through hole 41 and the first through hole 311 are partially misaligned in the thickness direction X, a part of the orthographic projection of the second through hole 41 on the first connecting portion 31 along the thickness direction X will fall on the bottom wall of the first cavity 321, and a part will pass through the first through hole 311 and fall outside the bottom wall of the first cavity 321 (that is, a part of the projection of the second through hole 41 along the thickness direction X will fall outside the first connecting portion 31). The total area of ​​the second through hole 41 projected on the first connection part 31 along the thickness direction X and falling on the bottom wall of the first cavity 321, or the total area of ​​the second through hole 41 and the first through hole 311 along the thickness direction X, that is, the size of S1, the ratio of S1 to the total area S2 of the second through hole 41, affects the impact force of the electrolyte on the explosion-proof valve 20. S1 / S2 is generally in the range of 0.4 to 1, and S1 / S2 can be any value among 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1 or a range value between any two values. S1 and S2 can be measured by a caliper: the corresponding size of the second through hole 41 can be directly measured by a caliper, and then the area of ​​the second through hole 41 can be obtained by calculation. It can also be measured by a three-dimensional scanner. The three-dimensional scanner can obtain the three-dimensional data corresponding to the second through hole 41, and then calculate the area of ​​the second through hole 41, that is, S2. The total area of ​​the second through hole 41 along the thickness direction X and the first through hole 311 can be obtained by irradiating the second through hole 41 with light along the thickness direction X, so that part of the light passes through the second through hole 41 and partially falls on the first connecting part 31, and a light spot will be formed on the first connecting part 31 (the light spot is also a projection of the misaligned part of the second through hole 41 along the thickness direction X and the corresponding first through hole 311). The corresponding size of the light spot is measured, and the total area of ​​the light spot is calculated, that is, S1. It should be noted that the performance of the structure of the second through hole 41 in the embodiment of the present application is represented by the cracking of the explosion-proof valve 20 of the battery under vibration. During the specific test, the battery is subjected to a vibration test, and the explosion-proof valve 20 is observed to see whether cracking occurs within the preset vibration time. The test results of the embodiment and the comparative example are as follows:

[0047]

[0048] As can be seen from the above table, when 0.4≤S1 / S2≤1, in the vibration test, the explosion-proof valve 20 did not crack, indicating that the impact force of the electrolyte on the explosion-proof valve 20 during the vibration process was small. When S1 / S2<0.4, the explosion-proof valve 20 cracked, indicating that the impact force of the electrolyte on the explosion-proof valve 20 during the vibration process was large. Therefore, the ratio of the total area S1 of the misaligned part of the second through hole 41 along the thickness direction X and the first through hole 311 to the total area S2 of the second through hole 41 satisfies: 0.4≤S1 / S2≤1, which can play a certain protective role on the explosion-proof valve 20 on the battery. During the vibration of the battery, less electrolyte can enter the second cavity 322 at the same time, reducing the impact force of the electrolyte on the explosion-proof valve 20 during the vibration of the battery, and playing a certain protective role on the explosion-proof valve 20.

[0049] See also Figure 1 and Figure 2 In combination with the above embodiments, in some embodiments, the first connection portion 31 has a plurality of first through holes 311 arranged at intervals, and the separator 40 has a plurality of second through holes 41 arranged at intervals, and the orthographic projection of each second through hole 41 on the first connection portion 31 along the thickness direction X is at least partially located outside a first through hole 311. It can be understood that the first through hole 311 and the second through hole 41 can be circular, square, etc., and their shapes are not limited here. By providing a plurality of first through holes 311 and a plurality of second through holes 41, when the battery has thermal runaway, if the thermal runaway occurs more violently and rapidly, the plurality of first through holes 311 and the plurality of second through holes 41 can pass more gas in time, so that the explosion-proof valve 20 on the battery can be opened in time to release the gas inside the battery. At the same time, under the premise of meeting the gas flow requirements during thermal runaway of the battery, providing multiple first through holes 311 spaced apart on the first connection portion 31 can make the first connection portion 31 have a higher strength than providing a through hole with a larger area, and reduce the probability of the first connection portion 31 being deformed by the impact of the electrolyte or other external forces. Similarly, providing multiple second through holes 41 spaced apart on the separator 40 can make the separator 40 have a higher strength than providing a through hole with a larger area, and reduce the probability of the separator 40 being deformed by the impact of the electrolyte or other external forces.

[0050] See also Figure 3 , Figure 5 and Figure 6In combination with the above embodiments, in some embodiments, the cover assembly further includes a support member 50. The support member 50 is located in the first cavity 321, extends in the thickness direction X, and is respectively connected to the first connection portion 31 and the partition 40, and the orthographic projection of the support member 50 on the first connection portion 31 along the thickness direction X is located outside the first through hole 311; the orthographic projection of the support member 50 on the partition 40 along the thickness direction X is located outside the second through hole 41. It can be understood that the support member 50 is disposed in the first cavity 321 and is respectively connected to the first connection portion 31 and the partition 40 in the thickness direction X, which can improve the strength of the partition 40 and the first connection portion 31 and increase their ability to resist deformation. At the same time, the orthographic projection of the support member 50 on the first connecting portion 31 along the thickness direction X is located outside the first through hole 311, that is, in the thickness direction X, the support member 50 and the first through hole 311 are also staggered, and the support member 50 does not block the first through hole 311. When the battery has thermal runaway, it is beneficial for the gas generated inside the battery to pass through the first through hole 311 smoothly and quickly, ensuring that the explosion-proof valve 20 can be opened in time. At the same time, the orthographic projection of the support member 50 on the separator 40 along the thickness direction X is located outside the second through hole 41, that is, in the thickness direction X, the support member 50 and the second through hole 41 are also staggered, and the support member 50 does not block the second through hole 41. When the battery has thermal runaway, it is beneficial for the gas generated inside the battery to pass through the second through hole 41 smoothly and quickly, ensuring that the explosion-proof valve 20 can be opened in time.

[0051] See also Figure 3 , Figure 5 and Figure 6 In combination with the above embodiments, in some embodiments, at least a portion of the support member 50 extends along the length direction Y of the cover body 10 and is connected to the first connection portion 31, so as to support the first connection portion 31 in the length direction Y, and / or at least a portion of the support member 50 extends along the width direction Z of the cover body 10 and is connected to the first connection portion 31, so as to support the first connection portion 31 in the width direction Z. It is understandable that a portion of the support member 50 may extend along the length direction Y of the cover body 10, and the two ends of the support member 50 extending in the length direction Y are respectively connected to the two opposite inner side walls of the first cavity 321, so as to support the first connection portion 31 in the length direction Y, ensure the strength of the first connection portion 31 in the length direction Y, and reduce the probability of deformation thereof in the length direction Y due to external force. Similarly, a portion of the support member 50 may extend along the width direction Z of the cover body 10, and the two ends of the support member 50 extending in the width direction Z are respectively connected to the other two opposite inner walls of the first cavity 321, thereby supporting the first connection part 31 in the width direction Z, ensuring the strength of the first connection part 31 in the width direction Z, and reducing the probability of deformation thereof in the width direction Z due to external force.

[0052] See also Figure 1 and Figure 5 In combination with the above embodiments, in some embodiments, the first connection part 31, the partition 40 and the support 50 are an integrated structure. It is understandable that the first connection part 31, the partition 40 and the support 50 can be integrally processed during production, thereby reducing the difficulty of processing, improving production efficiency, and also improving the strength of the connection between the first connection part 31, the partition 40 and the support 50, and improving the stability of the connection between the three.

[0053] See also Figure 1 , Figure 4 , Figure 7 and Figure 8 In combination with the above embodiments, in some embodiments, the cover body 10 has a liquid injection hole 60, and the insulating member 30 includes a second connection portion 33, which is located on the side of the cover body 10 facing the first connection portion 31 and connected to the cover body 10. The second connection portion 33 and the cover body 10 enclose a buffer cavity 34, and the buffer cavity 34 is connected to the liquid injection hole 60. The second connection portion 33 has a third through hole 331 connected to the buffer cavity 34, and there can be multiple third through holes 331, which are arranged at intervals. Along the thickness direction X of the cover body 10, the orthographic projection of the liquid injection hole 60 on the second connection portion 33 is located outside the third through hole 331. It can be understood that the liquid injection hole 60 is provided on the cover body 10 to facilitate the injection of electrolyte into the interior of the battery, but the aperture of the liquid injection hole 60 is generally small. When the device injects electrolyte into the interior of the battery through the liquid injection hole 60, the impact force of the battery liquid is large, which may cause damage to the electrode assembly inside the battery. Therefore, the second connection part 33 of the insulating member 30 is set at the position of the injection hole 60, along the thickness direction X of the cover body 10, so that the orthographic projection of the injection hole 60 on the second connection part 33 is located outside the third through hole 331, that is, the injection hole 60 and the third through hole 331 are staggered. When the electrolyte is injected into the interior of the battery through the injection hole 60 along the thickness direction X, the electrolyte will directly impact the position where the second connection part 33 does not have the third through hole 331. The buffering effect of the second connection part 33 can remove most of the impact force on the electrolyte. The buffered electrolyte then flows into the interior of the battery shell through the third through hole 331, which will not cause damage to the electrode assembly and other structures inside the battery shell, and plays a certain protective role in the structure inside the battery shell.

[0054] See also Figure 1 , Figure 4 , Figure 7 and Figure 8In combination with the above embodiments, in some embodiments, the cover assembly includes a reinforcement member 70. The reinforcement member 70 is located in the buffer cavity 34, and at least a portion of the reinforcement member 70 extends along the length direction Y of the cover body 10 and is connected to the second connection portion 33, and is used to support the second connection portion 33 in the length direction Y, and / or, at least a portion of the reinforcement member 70 extends along the width direction Z of the cover body 10 and is connected to the second connection portion 33, and is used to support the second connection portion 33 in the width direction Z; along the thickness direction X of the cover body 10, the orthographic projection of the reinforcement member 70 on the second connection portion 33 is located outside the third through hole 331. It can be understood that the reinforcement member 70 is arranged inside the buffer cavity 34, which can improve the compressive strength of the second connection portion 33 and increase its anti-deformation ability. The reinforcement member 70 may partially extend along the length direction Y of the cover plate body 10, and the two ends of the reinforcement member 70 extending in the length direction Y are respectively connected to the two opposite inner side walls of the buffer cavity 34, thereby supporting the second connection part 33 in the length direction Y, ensuring the strength of the second connection part 33 in the length direction Y, and reducing the probability of deformation caused by external force in the length direction Y. Similarly, the reinforcement member 70 may also partially extend along the width direction Z of the cover plate body 10, and the two ends of the reinforcement member 70 extending in the width direction Z are respectively connected to the other two opposite inner side walls of the buffer cavity 34, thereby supporting the second connection part 33 in the width direction Z, ensuring the strength of the second connection part 33 in the width direction Z, and reducing the probability of deformation caused by external force in the width direction Z.

[0055] See also Figure 1 , Figure 4 , Figure 7 and Fig. 9 In combination with the above embodiments, in some embodiments, at least part of the reinforcement 70 extends along the thickness direction X of the cover body 10, and is respectively connected to the cover body 10 and the second connection portion 33. It is understandable that the reinforcement 70 can extend along the thickness direction X, and the two ends of the reinforcement 70 extending in the width direction Z are respectively connected to the cover body 10 and the second connection portion 33, so as to support the second connection portion 33 in the thickness direction X, ensure the strength of the second connection portion 33 in the thickness direction X, and reduce the probability of deformation caused by external force in the thickness direction X. The reinforcement 70 and the second connection portion 33 can be integrally injection molded, thereby reducing the difficulty of processing and improving the efficiency of production, and can also improve the strength of the connection between the reinforcement 70 and the second connection portion 33 and improve the stability of the connection between the two.

[0056] A single cell battery comprises a shell, an electrode assembly and the above-mentioned cover assembly. The shell has a placement cavity. The electrode assembly is arranged in the placement cavity. The cover assembly seals the placement cavity and is connected to the shell. The connection between the cover assembly and the shell can be riveted or formed on the shell by injection molding, which is not limited here. A single cell battery is an independent battery unit that can generate electrical energy for electronic equipment or systems. A single cell battery usually has an electrode assembly including a positive electrode, a negative electrode, an electrolyte and a diaphragm, and also includes a shell, the shell has a receiving cavity, and the electrode assembly is arranged in the receiving cavity. The single cell battery also includes a cover assembly, which is connected to the shell and seals the receiving cavity, so that the structure inside the receiving cavity has a good working environment and is not affected by external factors.

[0057] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0058] The cover plate assembly and single cell provided in the embodiments of the present application are introduced in detail above, and the principles and implementation methods of the present application are explained by using specific examples. The description of the above embodiments is only used to help understand the technical solution and its core idea of ​​the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present application.

Claims

1. A cover plate assembly, characterized in that: include: The cover plate body has a connection hole; An explosion-proof valve, covering the connection hole and connected to the cover plate body; The insulating member includes a first connecting portion, the first connecting portion is located on one side of the cover body along the thickness direction and is connected to the cover body, the first connecting portion, the cover body and the explosion-proof valve are enclosed to form a flow cavity, and the first connecting portion has a first through hole connected to the flow cavity; A separator is located in the flow chamber and connected to the first connecting portion, the separator divides the flow chamber into a first cavity and a second cavity which are spaced apart along the thickness direction, the separator has a second through hole connecting the first cavity and the second cavity, and the orthographic projection of the second through hole on the first connecting portion along the thickness direction is at least partially located outside the first through hole.

2. The cover plate assembly according to claim 1, characterized in that: The cover plate assembly satisfies: 0.4≤S1 / S2≤1; Wherein, S1 is the total area of ​​the portion of the second through hole that is offset from the first through hole along the thickness direction, and S2 is the total area of ​​the second through hole.

3. The cover plate assembly according to claim 1, characterized in that: The first connecting portion has a plurality of first through holes arranged at intervals, the partition has a plurality of second through holes arranged at intervals, and the orthographic projection of each of the second through holes on the first connecting portion along the thickness direction is at least partially located outside one of the first through holes.

4. The cover plate assembly according to claim 1, characterized in that: The cover plate assembly also includes: A support member is located in the first cavity, the support member extends along the thickness direction and is respectively connected to the first connecting portion and the partition, the orthographic projection of the support member along the thickness direction on the first connecting portion is located outside the first through hole; the orthographic projection of the support member along the thickness direction on the partition is located outside the second through hole.

5. The cover plate assembly according to claim 4, characterized in that: At least a portion of the support member extends along the length direction of the cover body and is connected to the first connecting portion, for supporting the first connecting portion in the length direction, and / or at least a portion of the support member extends along the width direction of the cover body and is connected to the first connecting portion, for supporting the first connecting portion in the width direction.

6. The cover plate assembly according to claim 4, characterized in that: The first connecting portion, the partition and the supporting member are an integrated structure.

7. The cover plate assembly according to claim 1, characterized in that: The cover body has a liquid injection hole, and the insulating member includes a second connecting portion, which is located on a side of the cover body facing the first connecting portion and is connected to the cover body; The second connecting part and the cover body are combined to form a buffer cavity, and the buffer cavity is connected to the injection hole. The second connecting part has a third through hole connected to the buffer cavity. Along the thickness direction of the cover body, the orthographic projection of the injection hole on the second connecting part is located outside the third through hole.

8. The cover plate assembly according to claim 7, characterized in that: The cover plate assembly comprises: a reinforcement member located in the buffer cavity, wherein at least a portion of the reinforcement member extends along the length direction of the cover plate body and is connected to the second connection portion, and is used to support the second connection portion in the length direction, and / or at least a portion of the reinforcement member extends along the width direction of the cover plate body and is connected to the second connection portion, and is used to support the second connection portion in the width direction; Along the thickness direction of the cover plate body, the orthographic projection of the reinforcement member on the second connecting portion is located outside the third through hole.

9. The cover plate assembly according to claim 8, characterized in that: At least a portion of the reinforcement extends along the thickness direction of the cover plate body and is respectively connected to the cover plate body and the second connection portion.

10. A single cell battery, characterized in that: include: A housing having a placement cavity; An electrode assembly is disposed in the placement cavity; The cover plate assembly according to any one of claims 1 to 9, wherein the cover plate assembly covers the placement cavity and is connected to the shell.

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