Cover plate assembly, single battery and battery pack

Abstract

The utility model discloses a cover plate assembly, a single battery and a battery pack, 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 the side, in the thickness direction of the cover plate body, of the anti-explosion valve and is connected to the cover plate body, and an overflowing cavity is defined by the first connecting part, the cover plate body and the anti-explosion valve. When the battery vibrates, free electrolyte in the battery can impact on the first connecting part, part of the electrolyte enters the overflowing cavity through the first through hole, and due to the fact that the anti-explosion valve and the first through hole are arranged in a staggered mode, the electrolyte entering the overflowing cavity can impact on the cover plate body and cannot directly act on the anti-explosion valve, so that the anti-explosion valve is prevented from being damaged. Therefore, the structure can play a certain buffering role on the electrolyte, the impact force of the electrolyte on the anti-explosion valve is reduced, the anti-explosion valve is protected, and the anti-explosion valve is prevented from cracking and losing efficacy.

Description

Technical Field

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

[0002] To improve battery safety during use, explosion-proof valves are often installed. As battery capacity increases, the amount of electrolyte injected into the battery also gradually increases. During testing or use, the battery vibrates, and excessive free electrolyte in the battery impacts the explosion-proof valve, potentially causing it to crack and fail. Utility Model Content

[0003] Purpose of the utility model: An embodiment of the present application provides a cover plate assembly, which aims 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 battery; the third purpose of the embodiment of the present application is to provide a battery pack.

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

[0005] The cover body has a connecting 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, which is located on one side of the explosion-proof valve along the thickness direction of the cover body and is connected to the cover body. The first connecting portion, the cover body, and the explosion-proof valve form a flow cavity. The first connecting portion has a first through hole connected to the flow cavity. Along the thickness direction of the cover body, the orthographic projection of the explosion-proof valve on the first connecting portion is located outside the first through hole.

[0008] In some embodiments, the first connecting portion has a plurality of first through holes, the plurality of first through holes are arranged at intervals, and each of the first through holes extends along a thickness direction of the cover body.

[0009] In some embodiments, the cover plate assembly includes:

[0010] a support member located in the flow cavity and connected to the cover body and the first connecting portion, respectively, wherein along the thickness direction of the cover body, the orthographic projection of the support member on the cover body is arranged around the connecting hole;

[0011] The support member divides the flow chamber into a first accommodating chamber and a second accommodating chamber. The first accommodating chamber is communicated with the first through hole. The support member has a second through hole communicating with the first accommodating chamber and the second accommodating chamber.

[0012] In some embodiments, the support member has a plurality of second through holes, and the plurality of second through holes are arranged at intervals in the circumferential direction of the support member.

[0013] In some embodiments, the support member and the first connecting portion are an integral structure.

[0014] 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;

[0015] The second connecting portion and the cover body are combined to form a buffer cavity, which is connected to the injection hole. The second connecting portion 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 portion is located outside the third through hole.

[0016] In some embodiments, the cover plate assembly includes:

[0017] a reinforcement member located in the buffer cavity and connected to the second connection portion, wherein along the thickness direction of the cover plate body, an orthographic projection of the reinforcement member on the second connection portion is located outside the third through hole;

[0018] At least a portion of the reinforcement extends along the length direction of the cover plate body, and / or at least a portion of the reinforcement extends along the width direction of the cover plate body.

[0019] In some embodiments, at least a portion of the reinforcement extends along a thickness direction of the cover body and is connected to the cover body.

[0020] A single battery, comprising:

[0021] A housing having a placement cavity;

[0022] an electrode assembly, disposed in the placement cavity;

[0023] The cover plate assembly described in any one of the above is configured to cover the placement cavity and be connected to the shell.

[0024] A battery pack includes the cover plate assembly described in any one of the above, or includes the single battery described in the above.

[0025] Beneficial Effects: The cover assembly of the embodiment of the present application includes: a cover body having a connection hole; an explosion-proof valve sealing the connection hole and connected to the cover body; and an insulating member including a first connection portion, the first connection portion being located on one side of the explosion-proof valve along the thickness direction of the cover body and connected to the cover body. The first connection portion, the cover body, and the explosion-proof valve enclose a flow chamber, the first connection portion having a first through hole connected to the flow chamber, and the orthographic projection of the explosion-proof valve on the first connection portion being located outside the first through hole along the thickness direction of the cover body. When the battery vibrates, the free electrolyte in the battery will impact the first connection portion, and some of the electrolyte will enter the flow chamber through the first through hole. Since the explosion-proof valve is staggered with the first through hole, the electrolyte entering the flow chamber will impact the cover body instead of directly acting on the explosion-proof valve. Therefore, this structure can provide a certain buffering effect for the electrolyte, reduce the impact force of the electrolyte on the explosion-proof valve, and protect the explosion-proof valve, thereby preventing the explosion-proof valve from cracking and failing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. 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.

[0027] Figure 1 This is a front cross-sectional view of the cover assembly of an embodiment of the present application;

[0028] Figure 2 For the embodiment of this application Figure 1 A partial enlarged view of area A in the middle;

[0029] Figure 3 This is an internal cross-sectional view of the first connecting portion of an embodiment of the present application, wherein a support member is provided inside the first connecting portion;

[0030] Figure 4 This is a front perspective view of an insulating member according to an embodiment of the present application, wherein there is no supporting member inside the first connecting portion;

[0031] Figure 5 This is a front perspective view of an insulating member according to an embodiment of the present application, wherein a support member is provided inside the first connecting portion;

[0032] Figure 6 This is a reverse perspective view of an insulating member according to an embodiment of the present application;

[0033] Figure 7 For the embodiment of this application Figure 1 A partial enlarged view of area B in the middle;

[0034] Figure 8This is an internal cross-sectional view of the second connecting portion of an embodiment of the present application;

[0035] Figure markings: 10-cover body; 11-connecting hole; 12-liquid injection hole; 20-explosion-proof valve; 30-insulating member; 31-first connecting part; 311-first through hole; 32-flow chamber; 321-first accommodating chamber; 322-second accommodating chamber; 33-second connecting part; 331-third through hole; 34-buffer chamber; 40-support member; 41-second through hole; 50-reinforcement member; X-thickness direction; Y-length direction; Z-width direction. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0037] In the description of this 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 the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "plurality" means two or more, and at least one means one, two, or more, unless otherwise clearly and specifically defined.

[0038] To improve battery safety during use, an explosion-proof valve is often installed. The purpose is: when the battery experiences thermal runaway or short circuit, a large amount of gas will be generated inside. At this time, the explosion-proof valve opens in time to release pressure, avoiding more serious problems such as battery fire and explosion. As the current battery capacity increases, 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, which is the weakest part), which may cause the explosion-proof valve to crack and fail, and fail to protect the battery.

[0039] 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.

[0040] See also Figure 1 、 Figure 2 、 Figure 4 and Figure 6 In an embodiment of the present application, the cover assembly includes a cover body 10, an explosion-proof valve 20 and an insulating member 30.

[0041] The cover body 10 has a connection hole 11. The explosion-proof valve 20 seals the connection hole 11 and is connected to the cover body 10. The insulating member 30 includes a first connecting portion 31, which is located on one side of the explosion-proof valve 20 along the thickness direction X of the cover body 10 and is connected to the cover body 10. The first connecting portion 31, the cover body 10, and the explosion-proof valve 20 together form a flow cavity 32. The first connecting portion 31 has a first through-hole 311 connected to the flow cavity 32. The orthographic projection of the explosion-proof valve 20 on the first connecting portion 31 is located outside the first through-hole 311 along the thickness direction X of the cover body 10. It is understood that batteries contain free electrolyte, which is generally located within the battery casing, that is, on the side of the insulating member 30 facing away from the cover body 10. During vibration and shock testing of the battery or during normal use, the free electrolyte within the battery may slosh, impacting the side of the insulating member 30 facing away from the cover body 10. Because the orthographic projection of the explosion-proof valve 20 on the first connecting portion 31 is located outside the first through-hole 311 along the thickness direction X of the cover body 10, that is, the explosion-proof valve 20 and the first through-hole 311 are offset. Along the thickness direction X of the cover body 10, the first connecting portion 31 on the insulating member 30 can block a portion of the electrolyte, preventing the electrolyte inside the battery housing from directly contacting the explosion-proof valve 20 through the first connecting portion 31. This prevents this portion of electrolyte from directly acting on the explosion-proof valve 20 and causing damage to the explosion-proof valve 20. The first through-hole 311 provided on the first connecting portion 31 is intended to facilitate the discharge of gas from the battery in the event of thermal runaway. When the electrolyte shakes, some of the electrolyte can enter the interior of the overflow chamber 32 through the first through hole 311. Since the first through hole 311 and the explosion-proof valve 20 are staggered, when this part of the electrolyte moves along the extension direction of the first through hole 311, it may impact the inner side of the cover body 10 or the first connecting part 31, and will not directly impact the explosion-proof valve 20. This structure has a certain buffering effect on the electrolyte entering the overflow chamber 32, so that the electrolyte entering the overflow chamber 32 does not have a large kinetic energy. When the electrolyte in the overflow chamber 32 shakes with the vibration of the battery, due to the small internal space of the overflow chamber 32 and the limitation of space, the impact force generated by the shaking of the electrolyte in the overflow chamber 32 is small, and will not damage the explosion-proof valve, and will not cause the explosion-proof valve 20 to crack and fail.

[0042] See also Figure 1 、 Figure 2 and Figure 4In combination with the above embodiments, in some embodiments, the first connecting portion 31 has multiple first through holes 311. These multiple first through holes 311 are arranged at intervals, and each first through hole 311 extends along the thickness direction X of the cover plate body 10. It is understood that the first through holes 311 may be circular, square, or other shapes, and their shapes are not limited herein. Multiple first through holes 311 may be spaced apart on the first connecting portion 31. In the event of a battery thermal runaway, if the thermal runaway is severe and rapid, the multiple first through holes 311 can allow a large amount of gas to pass through in a timely manner, thereby allowing the explosion-proof valve 20 on the battery to open promptly and release the gas inside the battery. Each first through hole 311 extends along the thickness direction X of the cover plate body 10, allowing the gas generated inside the battery to travel a shorter distance and take less time to reach the interior of the flow chamber 32, thereby allowing the explosion-proof valve 20 to open promptly. On the premise of meeting the gas overflow requirements during battery thermal runaway, providing multiple first through holes 311 arranged at intervals can make the first connecting part 31 have higher strength than providing a through hole with a larger area, thereby preventing the first connecting part 31 from being deformed by the impact of the electrolyte.

[0043] See also Figure 3 、 Figure 5 and Figure 6 In combination with the above embodiments, in some embodiments, the cover assembly includes a support member 40. The support member 40 is located in the flow chamber 32 and is connected to the cover body 10 and the first connecting portion 31, respectively. Along the thickness direction X of the cover body 10, the orthographic projection of the support member 40 on the cover body 10 is arranged around the connecting hole 11. The support member 40 divides the flow chamber 32 into a first accommodating chamber 321 and a second accommodating chamber 322. The first accommodating chamber 321 is connected to the first through hole 311. The support member 40 has a second through hole 41 that connects the first accommodating chamber 321 and the second accommodating chamber 322. It can be understood that a support member 40 is provided inside the flow chamber 32. The support member 40 can be a sleeve-shaped structure, so that the bottom and / or side of the support member 40 are connected to the first connection part 31, and the top of the support member 40 is connected to the cover body 10. The support member 40 can support the first connection part 31 and the cover body 10 to prevent the first connection part 31 from being squeezed or impacted by external force during use or assembly and thus deforming, thereby improving the strength of the first connection part 31.

[0044] At the same time, the support member 40 is provided to separate the flow chamber 32 into a first accommodating chamber 321 and a second accommodating chamber 322. A second through hole 41 is provided on the support member 40 to connect the first accommodating chamber 321 and the second accommodating chamber 322, so that the gas entering the first accommodating chamber 321 through the first through hole 311 can enter the second accommodating chamber 322 through the second through hole 41. Since the explosion-proof valve and the second accommodating chamber 322 are provided in correspondence, the gas entering the second accommodating chamber 322 can squeeze the explosion-proof valve 20, so that the explosion-proof valve 20 can function normally to relieve pressure. The electrolyte that enters the first accommodating chamber 321 through the first through hole 311 will collide with the outer surface of the support member 40 as the battery vibrates. The support member 40 can buffer this portion of the electrolyte to prevent it from directly impacting the explosion-proof valve 20. Of course, some electrolyte will enter the second accommodating chamber 322 through the second through hole 41. Since the amount of this part of the electrolyte is relatively small and is limited by the spatial volume of the second accommodating chamber 322, the kinetic energy generated by the shaking of this part of the electrolyte under the action of battery vibration is not large and will not cause damage to the explosion-proof valve 20.

[0045] See also Figure 3 and Figure 5 In conjunction with the above embodiments, in some embodiments, the support member 40 has multiple second through holes 41, which are spaced apart around the circumference of the support member 40. It is understood that the second through holes 41 can be circular, square, or other shapes, and their shapes are not limited herein. Providing multiple second through holes 41 spaced apart around the circumference of the support member 40 can increase gas flow efficiency. In the event of thermal runaway in a battery, if the thermal runaway occurs rapidly and violently, the multiple second through holes 41 can allow a greater amount of gas to pass through in a timely manner, allowing the explosion-proof valve 20 on the battery to open promptly and release the gas inside the battery. While meeting the gas flow requirements during thermal runaway, providing multiple spaced apart second through holes 41 can provide greater strength to the support member 40 compared to providing a single, larger through hole, preventing deformation or even damage to the support member 40 during use or assembly, thereby ensuring the support effectiveness of the support member 40.

[0046] See also Figure 3 and Figure 5 In combination with the above embodiments, in some embodiments, the support member 40 and the first connecting portion 31 are an integrated structure. It is understood that the support member 40 and the first connecting portion 31 can be integrally formed during production, thereby reducing the difficulty of processing, improving production efficiency, and also increasing the strength of the connection between the support member 40 and the first connecting portion 31 and improving the stability of the connection between the two.

[0047] See also Figure 1 、 Figure 5 and Figure 7In combination with the above embodiments, in some embodiments, the cover body 10 has an injection hole 12, and the insulating member 30 includes a second connecting portion 33. The second connecting portion 33 is located on the side of the cover body 10 facing the first connecting portion 31 and is connected to the cover body 10. The second connecting portion 33 and the cover body 10 enclose a buffer cavity 34, which is connected to the injection hole 12. The second connecting portion 33 has a third through hole 331 that is connected to the buffer cavity 34. Along the thickness direction X of the cover body 10, the orthographic projection of the injection hole 12 on the second connecting portion 33 is located outside the third through hole 331. It is understood that the injection hole 12 is provided on the cover body 10 to facilitate the injection of electrolyte into the interior of the battery. However, the aperture of the injection hole 12 is generally small. When the device injects electrolyte into the interior of the battery through the injection hole 12, the impact force of the battery liquid is large, which may cause damage to the electrode assembly inside the battery. Therefore, the second connection portion 33 of the insulating member 30 is positioned at the location of the injection hole 12, along the thickness direction X of the cover body 10, so that the orthographic projection of the injection hole 12 on the second connection portion 33 is located outside the third through-hole 331. When electrolyte is injected into the interior of the battery through the injection hole 12 along the thickness direction X, the electrolyte directly impacts the location of the second connection portion 33 where the third through-hole 331 is absent. The buffering effect of the second connection portion 33 relieves most of the impact force on the electrolyte. After being buffered, the electrolyte then flows into the interior of the battery housing through the third through-hole 331, without damaging the electrode assembly and other structures within the battery housing, thus providing a certain degree of protection for the internal structures of the battery housing.

[0048] See also Figure 1 、 Figure 5 and Figure 7In conjunction with the above embodiments, in some embodiments, the cover plate assembly includes a reinforcement member 50. The reinforcement member 50 is located within the buffer cavity 34 and connected to the second connecting portion 33. Along the thickness direction X of the cover plate body 10, the orthographic projection of the reinforcement member 50 on the second connecting portion 33 is located outside the third through-hole 331. At least a portion of the reinforcement member 50 extends along the length direction Y of the cover plate body 10, and / or at least a portion of the reinforcement member 50 extends along the width direction Z of the cover plate body 10. It will be appreciated that the provision of the reinforcement member 50 within the buffer cavity 34 can enhance the strength of the second connecting portion 33, prevent deformation when impacted by injected electrolyte, and ensure the stability of the second connecting portion 33 during use. Along the thickness direction X of the cover plate body 10, the orthographic projection of the reinforcement member 50 on the second connecting portion 33 is located outside the third through-hole 331. In other words, the provision of the reinforcement member 50 does not block the third through-hole 331, allowing the third through-hole 331 to smoothly guide the electrolyte within the buffer cavity 34 into the interior of the battery housing. At least a portion of the reinforcement member 50 extends along the length direction Y of the cover plate body 10, and / or at least a portion of the reinforcement member 50 extends along the width direction Z of the cover plate body 10. That is, a portion of the reinforcement member 50 may extend in the length direction Y, and the ends of this portion may be connected to two opposing inner side surfaces of the second connecting portion 33 in the length direction Y, thereby enabling the reinforcement member 50 to support the second connecting portion 33 in the length direction Y and improve the deformation resistance of the second connecting portion 33 in the length direction Y. And / or, another portion of the reinforcement member 50 may extend in the width direction Z, and the ends of this portion may be connected to two opposing inner side surfaces of the second connecting portion 33 in the width direction Z, thereby enabling the reinforcement member 50 to support the second connecting portion 33 in the width direction Z and improve the deformation resistance of the second connecting portion 33 in the width direction Z.

[0049] See also Figure 1 and Figure 8 In combination with the above embodiments, in some embodiments, at least a portion of the reinforcement member 50 extends along the thickness direction X of the cover plate body 10 and is connected to the cover plate body 10. It is understood that a portion of the reinforcement member 50 may be a structure extending in the thickness direction X, and the two sides of this portion along the thickness direction X may be connected to the second connecting portion 33 and the cover plate body 10 respectively, so that the reinforcement member 50 can support the second connecting portion 33 in the thickness direction X and improve the deformation resistance of the second connecting portion 33 in the thickness direction X.

[0050] 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 method between the cover assembly and the shell can be riveting or injection molding on the shell, 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.

[0051] A battery pack includes the aforementioned cover plate assembly, or alternatively, the aforementioned single cell. A battery pack is a unit composed of multiple single cells, typically including components such as the battery cells, a battery management system (BMS), connectors, and a protective casing. Its primary function is to provide higher voltage, capacity, and energy density to meet the needs of various applications. Battery packs are commonly used in electric vehicles, drones, portable electronic devices, energy storage systems, emergency power supplies, and other fields.

[0052] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0053] The above is a detailed introduction to the cover assembly, single cell and battery pack provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solution and 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 make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solution to 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 body has a connecting hole; an explosion-proof valve, covering the connection hole and connected to the cover plate body; The insulating member includes a first connecting portion, which is located on one side of the explosion-proof valve along the thickness direction of the cover body and is connected to the cover body. The first connecting portion, the cover body, and the explosion-proof valve are combined to form a flow cavity. The first connecting portion has a first through hole connected to the flow cavity. Along the thickness direction of the cover body, the orthographic projection of the explosion-proof valve on the first connecting portion is located outside the first through hole.

2. The cover plate assembly according to claim 1, wherein: The first connecting portion has a plurality of first through holes, the plurality of first through holes are arranged at intervals, and each of the first through holes extends along a thickness direction of the cover body.

3. The cover plate assembly according to claim 1, wherein: The cover plate assembly comprises: a support member located in the flow cavity and connected to the cover body and the first connecting portion, respectively, wherein along the thickness direction of the cover body, the orthographic projection of the support member on the cover body is arranged around the connecting hole; The support member divides the flow chamber into a first accommodating chamber and a second accommodating chamber. The first accommodating chamber is communicated with the first through hole. The support member has a second through hole communicating with the first accommodating chamber and the second accommodating chamber.

4. The cover plate assembly according to claim 3, wherein: The support member has a plurality of second through holes, and the plurality of second through holes are arranged at intervals in the circumferential direction of the support member.

5. The cover plate assembly according to claim 3, wherein: The support member and the first connecting portion are an integrated structure.

6. The cover plate assembly according to claim 1, wherein: 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 portion and the cover body are combined to form a buffer cavity, which is connected to the injection hole. The second connecting portion 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 portion is located outside the third through hole.

7. The cover plate assembly according to claim 6, wherein: The cover plate assembly comprises: a reinforcement member located in the buffer cavity and connected to the second connection portion, wherein along the thickness direction of the cover plate body, an orthographic projection of the reinforcement member on the second connection portion is located outside the third through hole; At least a portion of the reinforcement extends along the length direction of the cover plate body, and / or at least a portion of the reinforcement extends along the width direction of the cover plate body.

8. The cover plate assembly according to claim 7, wherein: At least a portion of the reinforcement extends along the thickness direction of the cover plate body and is connected to the cover plate body.

9. A single battery, characterized in that: include: A housing having a placement cavity; an electrode assembly, disposed in the placement cavity; The cover assembly according to any one of claims 1 to 8, wherein the cover assembly covers the placement cavity and is connected to the shell.

10. A battery pack, characterized in that: The invention comprises the cap plate assembly according to any one of claims 1 to 8, or comprises the single battery according to claim 9.

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