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 first through hole; the pole structure penetrates through the first through hole and is connected with the cover plate body; the insulating part comprises a main body part and an extension part, at least part of the main body part is located on one side of the cover plate body in the thickness direction and connected with the cover plate body, the pole structure penetrates through the main body part, and the extension part is connected to one side of the main body part in the length direction of the cover plate body; the cover plate assembly meets the following conditions: 3mm < = A < = 10mm; wherein A is the minimum size of the extension part in the length direction of the cover plate body. Through the arrangement of the extension part, the size of the insulating part in the length direction of the cover plate body is increased, and in the use process of the battery, if a foreign matter falls on the cover plate, the foreign matter is not easy to electrically connect the pole structure with the cover plate body due to the increase of the size of the insulating part, so that the risk of short circuit of the battery is reduced, and the safety of the battery in the use process is ensured.

Description

Technical Field

[0001] This application belongs to the field of battery technology, and specifically relates to a cover plate assembly, a single cell, and a battery pack. Background Technology

[0002] The upper plastic structure on the battery cover is generally used to separate the terminal post structure from the cover body, providing insulation and preventing electrical connection between the terminal post structure and the cover body. However, the upper plastic structure is relatively small, and if a foreign object falls onto the cover, it may electrically connect the terminal post structure to the cover body, causing a short circuit in the battery. Utility Model Content

[0003] The purpose of this utility model is to provide a cover plate assembly to overcome the technical problem that when foreign objects fall onto the cover plate, the electrode structure may be electrically connected to the cover plate body; another purpose of this application is to provide a single battery cell; a third purpose of this application is to provide a battery pack.

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

[0005] The cover plate body has a first through hole;

[0006] The pole structure passes through the first through hole and is connected to the cover plate body;

[0007] An insulating component includes a main body and an extension, at least a portion of the main body being located on one side of the cover plate body along the thickness direction and connected to the cover plate body, the pole structure penetrating the main body, and the extension being connected to one side of the main body along the length direction of the cover plate body;

[0008] The cover plate assembly satisfies: 3mm≤A≤10mm;

[0009] Wherein, A is the minimum dimension of the extension in the length direction of the cover plate body.

[0010] In some embodiments, the main body has a receiving cavity and a second through hole connecting the receiving cavity and the first through hole, and the pole post structure passes through the second through hole and the receiving cavity; the pole post structure includes a pole post body and a fixing part connected to each other, at least a portion of the fixing part is located in the receiving cavity, and the pole post body passes through the first through hole and the second through hole and penetrates the fixing part;

[0011] The cover plate assembly also includes:

[0012] A filler is provided along the circumference of the fixing part, and the filler is placed between the fixing part and the sidewall of the receiving cavity.

[0013] In some embodiments, the main body includes a top surface disposed away from the cover plate body, and the main body also includes a first chamfer, the first chamfer being connected between the top surface and the side wall of the receiving cavity;

[0014] The fixing part includes a bottom surface facing the cover plate body and a side surface facing the side wall of the receiving cavity. The fixing part also includes a second chamfer, which connects the bottom surface and the side surface.

[0015] In some embodiments, the width of the receiving cavity is H1, and the width of the extension is H2, such that H2 ≥ H1.

[0016] In some embodiments, the insulating member includes a plurality of the extensions, which are respectively disposed on both sides of the main body along the length direction.

[0017] In some embodiments, the extension includes a base block and a flow guiding surface. The base block is connected to one side of the main body along the length direction of the cover plate body, and the flow guiding surface is disposed on the side of the base block opposite to the main body. The flow guiding surface is used to guide liquid flow.

[0018] In some embodiments, the guide surface is an arc-shaped surface that protrudes in a direction away from the main body, or the guide surface is an inclined plane.

[0019] In some embodiments, the main body and the extension are an integral structure.

[0020] A single-cell battery, comprising:

[0021] The casing has a placement cavity;

[0022] The electrode assembly is disposed within the placement cavity;

[0023] The cover plate assembly described above covers the placement cavity and is connected to the housing and the electrode assembly, respectively.

[0024] A battery pack includes the cover assembly described above, or includes the individual battery cells described above.

[0025] Beneficial Effects: The cover plate assembly of this application embodiment includes: a cover plate body having a first through hole; an electrode post structure passing through the first through hole and connected to the cover plate body; and an insulating member including a main body and an extension, at least a portion of the main body being located on one side of the cover plate body along the thickness direction and connected to the cover plate body, the electrode post structure passing through the main body, and the extension being connected to one side of the main body along the length direction of the cover plate body; the cover plate assembly satisfies: 3mm≤A≤10mm; where A is the minimum dimension of the extension in the length direction of the cover plate body. By providing the extension, the dimension of the insulating member in the length direction of the cover plate body is increased. During battery use, if a foreign object falls onto the cover plate, due to the increased size of the insulating member, the foreign object is less likely to electrically connect the electrode post structure to the cover plate body, reducing the risk of battery short circuit and ensuring battery safety during use. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a partial cross-sectional view of a cover plate assembly according to an embodiment of this application, wherein no fixing block is installed on the cover plate assembly;

[0028] Figure 2 This is a partial cross-sectional view of a cover plate assembly according to an embodiment of this application, wherein a fixing block is mounted on the cover plate assembly;

[0029] Figure 3 Examples of this application Figure 2 Enlarged view of a portion of area A in the middle;

[0030] Figure 4 This is a perspective view of the cover plate assembly according to an embodiment of this application;

[0031] Figure 5 This is a perspective view of the insulating component according to an embodiment of this application;

[0032] Figure 6 This is a top view of the insulating component according to an embodiment of this application;

[0033] Figure 7 This is a partial structural schematic diagram of the insulating component according to an embodiment of this application, wherein the flow guiding surface is an arc-shaped surface;

[0034] Figure 8 This is a partial structural schematic diagram of the insulating component according to an embodiment of this application, wherein the guiding surface is an inclined plane;

[0035] Figure 9This is a perspective view of a single battery cell according to an embodiment of this application;

[0036] Reference numerals: 10-Cover plate body; 11-First through hole; 20-Pole post structure; 21-Pole post body; 22-Fixing part; 221-Bottom surface; 222-Side surface; 223-Second chamfer; 30-Insulating part; 31-Main body; 311-Receiving cavity; 312-Second through hole; 313-Top surface; 314-First chamfer; 32-Extension part; 321-Base block; 322-Guiding surface; 50-Filling part; X-Thickness direction; Y-Length direction; Z-Width direction. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0038] 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 construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified.

[0039] A battery pack typically contains multiple individual cells arranged in an orderly fashion. These cells are generally placed horizontally, meaning the length of the cover plate on each cell is either the same as or opposite to the direction of gravity. Furthermore, for energy storage products like battery packs, the sealing is less precise than that of power products. For example, if the ambient humidity is too high, water droplets can form inside the battery pack. These droplets may drip onto the batteries under gravity and, simultaneously, connect the terminal structure and the cover plate (some battery products may have insulating patches on the cover plate and outer casing; however, manufacturing errors can cause these patches to not fit perfectly; gaps may also appear during application, allowing water droplets to connect). This can cause the insulation between the terminal structure and the cover plate to fail, leading to a short circuit and compromising battery safety during use.

[0040] In view of the above, embodiments of this application provide a cover plate assembly to overcome at least one of the above-mentioned technical problems.

[0041] Please see Figure 1 , Figure 4 , Figure 5 and Figure 9 In this embodiment of the application, the cover plate assembly includes a cover plate body 10, a pole structure 20, and an insulating element 30.

[0042] The cover plate body 10 has a first through hole 11. The electrode post structure 20 passes through the first through hole 11 and is connected to the cover plate body 10. The insulating member 30 includes a main body portion 31 and an extension portion 32. At least a portion of the main body portion 31 is located on one side of the cover plate body 10 along the thickness direction X and is connected to the cover plate body 10. The electrode post structure 20 passes through the main body portion 31, and the extension portion 32 is connected to one side of the main body portion 31 along the length direction Y of the cover plate body 10. It is understood that the electrode post structure 20 is mounted on the cover plate body 10 by passing through the first through hole 11, and the insulating member 30 separates the electrode post structure 20 from the cover plate body 10, thereby insulating the electrode post structure 20 from the cover plate body 10. The insulating member 30 is generally an upper plastic structure in a battery. The insulating member 30 increases its dimension in the length direction Y by adding the extension portion 32 on one side of the length direction Y. When the battery is in use, it is placed horizontally, with the length direction Y of the cover body 10 being the same as or opposite to the direction of gravity. Simultaneously, the extension 32 is positioned above the main body 31. If water droplets condense inside the battery pack, they will drip under gravity and easily fall onto the side of the insulating component 30 along the length direction Y (e.g., Figure 9 In the diagram (where point N is the location where the water droplet falls), due to the obstruction of the extension 32, the water droplet cannot simultaneously connect to both the cover body 10 and the terminal structure 20. The water droplet might connect to the cover body 10 at the point of fall, while a portion flows towards the terminal structure 20 under gravity. However, because the extension 32 has a large dimension along its length Y, when the water droplet flows along the extension 32 under gravity, due to the diversion effect of the structure and the volume of the water droplet itself (a large water droplet will not form within the battery pack), the water droplet cannot flow to the corresponding terminal structure 20. Alternatively, the water droplet may break during its flow, splitting into two parts, one remaining at the point of fall and the other reaching the terminal structure 20, preventing the terminal structure 20 from connecting to the cover body 10. This reduces the risk of battery short circuits and ensures battery safety during use. If a water droplet falls on one side of the insulating member 30 along the width direction Z, it will flow downwards along the edge of the insulating member 30 under the action of gravity, and will not cause the pole structure 20 to be electrically connected to the cover plate body 10. Of course, the extension part 32 structure not only reduces the probability of the pole structure 20 and the cover plate body 10 being electrically connected through water droplets, but also reduces the probability of the pole structure 20 and the cover plate body 10 being electrically connected through metal wires or other foreign objects. Here, the medium for the electrical connection between the two is not limited.

[0043] The cover assembly satisfies: 3mm ≤ A ≤ 10mm; where A is the minimum dimension of the extension 32 along the length Y direction of the cover body 10. A is generally within the range of 3mm to 10mm, and can be any value or a range between any two values ​​from 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, to 10mm. The value of A can be measured directly using calipers. It should be noted that the structural performance of the extension 32 can be represented by whether a water droplet falling under gravity electrically connects the terminal structure 20 to the cover body 10. In the specific test, the battery is placed horizontally, that is, the length Y direction of the cover body 10 is the same as or opposite to the direction of gravity, simulating the internal environment of the battery pack, so that water droplets are generated inside the battery pack, and the water droplets fall onto the insulating part 30 under the action of gravity, and it is observed whether the water droplets electrically connect the terminal structure 20 to the cover body 10. The experimental results of the examples and comparative examples are shown in the table below:

[0044]

[0045]

[0046] As shown in the table above, when the minimum dimension A of the extension 32 along the length Y direction of the cover body 10 is between 3mm and 10mm, water droplets inside the battery pack drip onto one side of the extension 32 along the length Y direction under the influence of gravity. The extension 32 can effectively block the water droplets, preventing the terminal structure 20 from becoming electrically connected to the cover body 10. When the minimum dimension A of the extension 32 along the length Y direction of the cover body 10 is less than 3mm, water droplets drip onto the extension 32, and the blocking effect of the extension 32 on the water droplets is weakened, allowing the water droplets to electrically connect the terminal structure 20 to the cover body 10. When the minimum dimension A of the extension 32 along the length Y direction of the cover body 10 is greater than 10mm, the size of the extension 32 is too large, occupying too much space on one side of the cover body 10, which is detrimental to battery use. Therefore, when the minimum dimension A of the extension 32 along the length direction Y of the cover plate body 10 is in the range of 3mm to 10mm, the extension 32 has a good effect of blocking water droplets and can prevent the pole structure 20 from being electrically connected to the cover plate body 10.

[0047] Please see Figure 1 , Figure 2 and Figure 3In conjunction with the above embodiments, in some embodiments, the main body 31 has a receiving cavity 311 and a second through hole 312 connecting the receiving cavity 311 and the first through hole 11. The pole post structure 20 passes through the second through hole 312 and the receiving cavity 311. The pole post structure 20 includes a pole post body 21 and a fixing part 22 connected to each other. At least a portion of the fixing part 22 is located within the receiving cavity 311. The pole post body 21 passes through the first through hole 11 and the second through hole 312, and also passes through the fixing part 22. The cover plate assembly also includes a filler 50. The filler 50 is circumferential along the fixing part 22 and fills the space between the fixing part 22 and the sidewall of the receiving cavity 311. It is understood that the fixing part 22 is generally a riveting block structure on the battery, used to fix the pole post body 21 so that it can be stably installed on the cover plate body 10. Furthermore, the fixing part 22 is generally made of a conductive metallic material, which can be electrically connected to the terminal body 21. This increases the contact area between the battery and the external conductive contacts, thereby increasing the current flow area and improving the battery's charging and discharging capacity to a certain extent. At least a portion of the fixing part 22 is installed inside the receiving cavity 311. Due to manufacturing errors, there may be a certain gap between the fixing part 22 and the side wall of the receiving cavity 311. Dust, water stains, and other foreign objects may fall into this gap, affecting the service life of the fixing part 22 and the insulating component 30, as well as the conductivity of the fixing part 22. The existence of the gap may also affect the stability of the installation of the fixing part 22 and the insulating component 30, causing them to wobble. By providing a filler 50 (generally made of insulating material) between the fixing part 22 and the side wall of the receiving cavity 311, the filler 50 can fill the gap between the fixing part 22 and the side wall of the receiving cavity 311, which can prevent foreign objects from falling into the gap. At the same time, it can also make the fixing part 22 and the insulating part 30 tightly connected, ensuring the stability of the installation of the fixing part 22 and the insulating part 30.

[0048] Please see Figure 1 , Figure 2 , Figure 3 and Figure 5In conjunction with the above embodiments, in some embodiments, the main body 31 includes a top surface 313 disposed away from the cover plate body 10, and the main body 31 also includes a first chamfer 314, which connects the top surface 313 and the side wall of the receiving cavity 311 and is disposed towards the fixing part 22. The fixing part 22 includes a bottom surface 221 disposed towards the cover plate body 10 and a side surface 222 disposed towards the side wall of the receiving cavity 311, and the fixing part 22 also includes a second chamfer 223, which connects the bottom surface 221 and the side surface 222 and is disposed towards the main body 31. It is understandable that a first chamfer 314 is provided at the top of the main body 31 and a second chamfer 223 is provided at the bottom of the fixing part 22. During the process of installing the fixing part 22 inside the receiving cavity 311, the second chamfer 223 and the first chamfer 314 cooperate with each other and can guide the fixing part 22 during its movement, so that the fixing part 22 can be quickly embedded into the receiving cavity 311, reducing the difficulty of installing the fixing part 22.

[0049] Please see Figure 6 In conjunction with the above embodiments, in some embodiments, the width dimension of the receiving cavity 311 is H1, and the width dimension of the extension 32 is H2, satisfying that H2≥H1. Understandably, the width H2 of the extension 32 needs to be greater than or equal to the width H1 of the receiving cavity 311, so that when a water droplet falls onto one side of the insulating member 30 along the length direction Y, the orthographic projection of the extension 32 in the length direction Y can cover the orthographic projection of the receiving cavity 311 in the length direction Y. Therefore, the extension 32 can block the water droplet falling under the action of gravity, preventing the water droplet from falling into the receiving cavity 311, but instead causing it to fall onto the extension 32 (since the side wall of the main body 31 is relatively thin, if a water droplet falls onto one side of the main body 31 along the length direction Y, some water droplets may enter the receiving cavity 311 and connect with the fixing part 22 inside the receiving cavity 311, so the extension 32 is needed to block the falling water droplet). This prevents the water droplet from simultaneously connecting the fixing part 22 inside the receiving cavity 311 and the cover plate body 10, thereby improving the protective effect of the insulating member 30.

[0050] Please see Figure 1 , Figure 4 , Figure 5 and Figure 6In conjunction with the above embodiments, in some embodiments, the insulating member 30 includes multiple extensions 32, which are respectively disposed on both sides of the main body 31 along the length direction Y. It is understood that extending portions 32 can be provided on both sides of the insulating member 30 along the length direction Y, which provides greater flexibility in battery placement compared to providing an extension portion 32 only on one side of the insulating member 30 along the length direction Y. When an extension portion 32 is provided on only one side, the extension portion 32 needs to be positioned above the main body 31 during battery placement; otherwise, the extension portion 32 will lose its function of preventing electrical connection between the terminal structure 20 and the cover plate body 10. Providing extending portions 32 on both sides of the main body 31 along the length direction Y can provide a certain degree of error prevention during battery placement, allowing for both upright and reverse placement. In the placement state, an extension portion 32 is always positioned above the main body 31, preventing electrical connection between the terminal structure 20 and the cover plate body 10.

[0051] Please see Figure 7 and Figure 8 In conjunction with the above embodiments, in some embodiments, the extension 32 includes a base block 321 and a guide surface 322. The base block 321 is connected to one side of the main body 31 along the length direction Y of the cover plate body 10, and the guide surface 322 is disposed on the side of the base block 321 opposite to the main body 31. The guide surface 322 is used to guide the liquid. It can be understood that by providing the guide surface 322 on the side of the extension 32 opposite to the main body 31, water droplets will fall onto the guide surface 322 under the action of gravity. Under the guiding action of the guide surface 322, some water droplets can slide out of the guide surface 322 along both sides of the insulating member 30 in the width direction Z, quickly guiding the water droplets away and reducing the risk of electrical connection between the pole structure 20 and the cover plate body 10.

[0052] Please see Figure 7 and Figure 8 In conjunction with the above embodiments, in some embodiments, the guide surface 322 is an arc-shaped surface that protrudes in a direction away from the main body 31, or the guide surface 322 is an inclined plane. It is understood that the guide surface 322 can be an arc-shaped surface; when water droplets fall onto the guide surface 322 under gravity, the water droplets can flow along the arc-shaped surface to both sides of the insulating member 30, thus quickly guiding the water droplets away. The guide surface 322 can also be an inclined plane; when water droplets fall onto the guide surface 322 under gravity, the water droplets can flow along the inclined plane to one side of the insulating member 30, also quickly guiding the water droplets away. This configuration of the guide surface 322 can guide the water droplets, reducing the risk of electrical connection between the pole structure 20 and the cover plate body 10.

[0053] Please see Figure 1 , Figure 4 and Figure 5In conjunction with the above embodiments, in some embodiments, the main body 31 and the extension 32 are an integral structure. It is understood that the main body 31 and the extension 32 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 main body 31 and the extension 32.

[0054] A single-cell battery includes a casing, an electrode assembly, and a cover assembly. The casing has a placement cavity; the electrode assembly is disposed within the placement cavity; a cover assembly covers the placement cavity and is connected to both the casing and the electrode assembly. A single-cell battery is an independent battery unit capable of generating electrical energy to supply electronic devices or systems. A single-cell battery typically has an electrode assembly comprising a positive electrode, a negative electrode, an electrolyte, and a separator, and also includes a casing with a receiving cavity in which the electrode assembly is disposed. The single-cell battery further includes a cover assembly connected to the casing and covering the receiving cavity, thereby providing a favorable working environment for the internal structure of the receiving cavity and preventing it from being affected by external factors.

[0055] A battery pack includes the cover assembly described above, or includes the individual battery cells described above. A battery pack is an integral unit composed of multiple individual battery cells, typically including battery cells, a battery management system (BMS), connectors, a protective casing, and other components. Its main 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.

[0056] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0057] The cover plate assembly, single battery cell, and battery pack provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A cover plate assembly, characterized by The cover plate assembly comprises: a cover plate body having a first through hole; a pole structure penetrating the first through hole and being insulatedly connected with the cover plate body; an insulating piece comprising a main body part and an extension part, at least part of the main body part being located on one side of the cover plate body along the thickness direction and being connected with the cover plate body, the pole structure penetrating the main body part, the extension part being connected to one side of the main body part along the length direction of the cover plate body; the cover plate assembly satisfies 3mm≤A≤10mm; wherein A is the minimum size of the extension part along the length direction of the cover plate body.

2. The cover plate assembly of claim 1, wherein, the main body part has a receiving cavity and a second through hole communicating the receiving cavity and the first through hole, the pole structure penetrating the second through hole and the receiving cavity; the pole structure comprises a pole body and a fixing part connected with each other, at least part of the fixing part being located in the receiving cavity, the pole body penetrating the first through hole and the second through hole and penetrating the fixing part; the cover plate assembly further comprises: a filling piece along the circumference of the fixing part, the filling piece being filled between the fixing part and the side wall of the receiving cavity.

3. The cover plate assembly of claim 2, wherein, the main body part comprises a top surface arranged away from the cover plate body, the main body part further comprises a first chamfer connected between the top surface and the side wall of the receiving cavity; the fixing part comprises a bottom surface arranged towards the cover plate body and a side surface arranged towards the side wall of the receiving cavity, the fixing part further comprises a second chamfer connected between the bottom surface and the side surface.

4. The cover plate assembly of claim 2, wherein, the width size of the receiving cavity is H1, and the width size of the extension part is H2, satisfying H2≥H1.

5. The cover plate assembly of claim 1, wherein, the insulating piece comprises a plurality of extension parts, and the plurality of extension parts are arranged on both sides of the main body part along the length direction respectively.

6. The cover plate assembly of claim 1, wherein, the extension part comprises a base block connected to one side of the main body part along the length direction of the cover plate body and a flow guide surface arranged on the side of the base block away from the main body part, the flow guide surface being used for guiding liquid.

7. The cover plate assembly of claim 6, wherein, the flow guide surface is an arc surface and is convex towards the direction away from the main body part, or the flow guide surface is an inclined plane.

8. The cover plate assembly of claim 1, wherein, the main body part and the extension part are of an integrated structure.

9. A single cell, characterized by The single battery comprises: a shell having a placing cavity; an electrode assembly arranged in the placing cavity; the cover plate assembly of any one of claims 1 to 8, the cover plate assembly covering the placing cavity and being connected with the shell and the electrode assembly respectively.

10. A battery pack, characterized by, The single battery comprises the cover plate assembly of any one of claims 1 to 8 or the single battery of claim 9.

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