Top cover assembly and battery cell

Abstract

The utility model relates to a kind of top cover assembly and battery monomer, the top cover assembly includes cover and the insulating piece of being located in the cover one side;The insulating piece includes the body of board, the surface of the body is provided with first liquid guide groove and second liquid guide groove along first thickness direction to the cover, the first liquid guide groove is communicated with the liquid injection hole of being located in the cover, the second liquid guide groove is located at the rim of the body and is located in the first liquid guide groove outside around first axis, the first axis extends along the first thickness direction;The rim of the body is provided with liquid guide hole through in the first thickness direction, and the second liquid guide groove is communicated the first liquid guide groove and the liquid guide hole.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, and in particular to a top cover assembly and a battery cell. Background Technology

[0002] With the rapid expansion and development of the new energy market, the market share of new energy vehicles is gradually increasing. As a result, the application of power batteries, the core component of new energy vehicles, is becoming increasingly widespread in people's lives.

[0003] In a single battery cell, the insulating component is fixed to the cover plate, and the electrolyte injection hole penetrates through the cover plate and the insulating component. During high-pressure electrolyte injection, the electrolyte flows directly towards the cell assembly, which can easily cause the electrode and separator to separate, posing a risk of short circuit. Utility Model Content

[0004] Therefore, it is necessary to provide a top cover assembly and battery cell that facilitates electrolyte injection and does not easily cause separation of the electrode and separator, in order to address the problem that the direct flow of electrolyte into the cell assembly during electrolyte injection can easily lead to separation of the electrode and separator.

[0005] On the one hand, this application provides a top cover assembly, the top cover assembly including a cover plate and an insulating member disposed on one side of the cover plate;

[0006] The insulating component includes a plate-shaped body. The surface of the body facing the cover plate along a first thickness direction is provided with a first liquid guiding groove and a second liquid guiding groove. The first liquid guiding groove communicates with a liquid injection hole that penetrates the cover plate. The second liquid guiding groove is located at the edge of the body and surrounds the first liquid guiding groove around a first axis extending along the first thickness direction.

[0007] The edge of the body is provided with a liquid guiding hole through the first thickness direction, and the second liquid guiding groove connects the first liquid guiding groove and the liquid guiding hole.

[0008] In one embodiment, a notch is formed on the outward-facing side of the liquid guiding hole;

[0009] and / or

[0010] The body includes a main body and a protrusion. The main body includes an interconnected intermediate region and an edge region. The edge region surrounds the intermediate region. The protrusion protrudes from a portion of the intermediate region. The protrusion and the remaining portion of the intermediate region form a first liquid guiding groove. The protrusion and the edge region form a second liquid guiding groove. The second liquid guiding groove has a bottom wall formed by the edge region and a side wall formed by the protrusion. The liquid guiding hole is formed on the bottom wall of the second liquid guiding groove.

[0011] In one embodiment, the first liquid guiding groove and the second liquid guiding groove together form a liquid guiding channel; the liquid guiding channel has a first depth H along the first thickness direction, and the body has a first thickness H1 along the first thickness direction; 1 / 3H1≤H≤2 / 3H1;

[0012] and / or

[0013] The liquid guiding channel has a first depth H along the first thickness direction, and the liquid guiding channel has a first width A, where A = H.

[0014] In one embodiment, the first liquid guiding groove and the second liquid guiding groove together form a liquid guiding channel; the liquid guiding hole has a cross-sectional area S, the liquid guiding channel has a first depth H along the first thickness direction, and the liquid guiding channel has a first width A; AH≤S;

[0015] and / or

[0016] The main body has an injection groove on one end surface where the first liquid guiding groove is provided, which is directly opposite the injection hole. The second liquid guiding groove is arranged around the first axis outside the injection groove. The first liquid guiding groove connects the second liquid guiding groove and the injection groove.

[0017] In one embodiment, the edge of the body is provided with a plurality of liquid guiding holes surrounding the first liquid guiding groove;

[0018] and / or

[0019] The body has an explosion-proof through hole extending along the first thickness direction.

[0020] In one embodiment, the surface of the body where the first liquid guiding groove is provided is also provided with a third liquid guiding groove, the third liquid guiding groove connecting the first liquid guiding groove and the explosion-proof through hole; the first liquid guiding groove and the second liquid guiding groove together form a liquid guiding channel; the liquid guiding channel has a first depth along the first thickness direction, and the third liquid guiding groove has a second depth along the first thickness direction, the second depth being less than the first depth;

[0021] and / or

[0022] The body has a smoke guide groove on the other end surface opposite to the first liquid guide groove along the first thickness direction, and the smoke guide groove is connected to the explosion-proof through hole.

[0023] In one embodiment, the smoke guide groove has a third depth H2 along the first thickness direction, and the body has a first thickness H1 along the first thickness direction, where 1 / 3H1≤H2≤1 / 2H1;

[0024] and / or

[0025] The total area S1 of all the smoke guide channels and the total area S2 of the explosion-proof through holes satisfy the following relationship: S2≤S1≤1.5S2.

[0026] In one embodiment, the main body is provided with multiple smoke guide grooves, which are radially distributed around the explosion-proof through hole.

[0027] In one embodiment, the other end surface of the body opposite to the first liquid guiding groove along the first thickness direction is provided with a receiving groove, and the surface of the body with the first liquid guiding groove along the first thickness direction is provided with an exposure hole and an electrode hole that are both connected to the receiving groove.

[0028] The receiving groove is used to receive the electrode tab connection part, the exposure hole is used to expose the electrode tab connection part, and the electrode post hole is for the electrode post to pass through;

[0029] The body is provided with a tab hole along the first thickness direction, and the tab hole allows the tab to pass through and be folded to connect with the exposed part of the tab connection part.

[0030] On the other hand, this application also provides a battery cell, including a cell assembly and the aforementioned top cover assembly, wherein the insulating member is insulated between the cell assembly and the cover plate.

[0031] Compared with the prior art, this application has the following beneficial effects:

[0032] During electrolyte injection, the electrolyte is injected through the injection hole. The injected electrolyte first flows into the first liquid guiding groove, then into the second liquid guiding groove surrounding it, and finally flows into the casing through the liquid guiding hole located at the edge of the battery body. In this way, the rapidly injected electrolyte does not directly rush towards the cell assembly along the first thickness direction through the injection hole. Instead, it flows through the first and second liquid guiding grooves and finally into the casing through the liquid guiding hole at the edge of the battery body. This avoids the electrolyte directly impacting the cell assembly, reducing the risk of electrode and separator separation and lowering the risk of short circuits. Attached Figure Description

[0033] Figure 1 This is a structural diagram of a battery cell provided in an embodiment of this application;

[0034] Figure 2 for Figure 1 An exploded view of a single battery cell shown;

[0035] Figure 3 for Figure 1 An exploded view of the top cover assembly of the battery cell shown.

[0036] Figure 4 for Figure 1 A cross-sectional view of the AA side of the battery cell shown;

[0037] Figure 5 for Figure 4 Enlarged view of point A of the battery cell shown;

[0038] Figure 6 for Figure 3 The diagram shows the structure of the insulating component of the top cover assembly.

[0039] Figure 7 This is a flow diagram of the electrolyte on the insulating component;

[0040] Figure 8 for Figure 7 A cross-sectional view of the BB side of the insulating component shown;

[0041] Figure 9 for Figure 8 A partial enlarged view of the insulating component shown;

[0042] Figure 10 This is a flow diagram of flue gas on an insulating component;

[0043] Figure 11 for Figure 6 A structural diagram of the insulating component from another perspective;

[0044] Figure 12 This is a flow diagram of flue gas on an insulating component.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1000, Battery cell; 100, Cell assembly; 101, Tab; 200, Top cover assembly; 10, Insulator; 11, Body; 111, First liquid guide groove; 112, Second liquid guide groove; 113, Liquid guide hole; 1131, Notch; 114, Main body; 1141, Middle area; 1142, Edge area; 115, Protrusion; 116, Injection groove; 117, Explosion-proof through hole; 118, Third liquid guide groove; 119, Smoke guide groove; 1110, Receiving groove; 1120, Exposed hole; 1130, Terminal hole; 1140, Tab hole; 20, Cover plate; 21, Injection hole; 30, Terminal; 31, Tab connection; 32, External connecting post; 40, Insulating cover; Z, First thickness direction; X, Second thickness direction. Detailed Implementation

[0047] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0048] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0049] Furthermore, 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0053] See Figure 1 and Figure 2 One embodiment of this application provides a battery cell 1000 and a top cover assembly 200. The battery cell 1000 includes a cell assembly 100 and the aforementioned top cover assembly 200. (See also...) Figure 3 The top cover assembly 200 includes a cover plate 20 and an insulating member 10. The insulating member 10 is disposed on one side of the cover plate 20 along a first thickness direction Z, and is insulatingly disposed between the battery cell assembly 100 and the cover plate 20. Specifically, the surface of the insulating member 10 away from the cover plate 20 abuts against the surface of the battery cell assembly 100. The insulating member 10 is made of plastic material, and the plastic is generally a rigid plastic with certain heat resistance and good support. The first thickness direction Z refers to the thickness direction of the insulating member 10 and the cover plate 20.

[0054] Furthermore, the battery cell 1000 also includes a housing (not shown in the figure), which is a hollow structure with an internal cavity for accommodating the cell assembly 100, electrolyte, and other components. The cavity has an opening through which the cell assembly 100 is inserted into the housing. Specifically, in this embodiment, the battery cell 1000 is a prismatic battery, so the outer contour of the housing is cuboid, and its opening is rectangular. The top cover assembly 200 is mounted on the housing and covers its opening, thereby creating a relatively closed environment inside the housing to isolate the cell assembly 100 from the external environment. Since the shape of the top cover assembly 200 needs to match the shape of the opening, the top cover assembly 200 is generally rectangular. Of course, in other embodiments, the shape of the battery cell 1000 is not limited.

[0055] The cell assembly 100 is the core component of the battery cell 1000. To fit the shape of the casing, the cell assembly 100 in this embodiment is approximately cuboid in shape. See also... Figure 4 and Figure 5 The battery cell assembly 100 may be provided in one group or multiple groups arranged side by side in the second thickness direction X of the housing; this is not limited here. Each group of battery cell assemblies 100 extends a tab 101 toward the top cover assembly 200. Specifically, each group of battery cell assemblies 100 extends a positive tab and a negative tab toward the top cover assembly 200. The second thickness direction X intersects the first thickness direction Z; more specifically, the second thickness direction X and the first thickness direction Z are perpendicular.

[0056] In some embodiments, see Figure 3 and Figure 6 The cover plate 20 has a liquid injection hole 21 extending through it along the first thickness direction Z. The insulating member 10 includes a plate-shaped body 11. The surface of the body 11 facing the cover plate 20 along the first thickness direction Z has a first liquid guiding groove 111 and a second liquid guiding groove 112. The first liquid guiding groove 111 communicates with the liquid injection hole 21, and the second liquid guiding groove 112 is located at the edge of the body 11 and surrounds the first liquid guiding groove 111 around a first axis. The first axis extends along the first thickness direction Z. Further, the edge of the body 11 has a liquid guiding hole 113 extending through it in the first thickness direction Z, and the second liquid guiding groove 112 connects the first liquid guiding groove 111 and the liquid guiding hole 113.

[0057] In the above configuration, during electrolyte injection, the electrolyte in the battery cell 1000 is injected through the injection hole 21. The electrolyte injected through the injection hole 21 first flows into the first liquid guiding groove 111, then flows through the first liquid guiding groove 111 into the second liquid guiding groove 112 surrounding it, and finally flows into the housing from the liquid guiding hole 113 located on the edge of the body 11 (see...). Figure 7 , Figure 7 (The green lines represent the flow direction of the electrolyte). In this way, the high-speed injected electrolyte will not flow directly into the cell assembly 100 along the first thickness direction Z through the injection hole 21, but will flow through the first liquid guiding groove 111 and the second liquid guiding groove 112 and finally flow into the housing from the liquid guiding hole 113 on the edge of the body 11. This avoids the electrolyte directly rushing into the cell assembly 100, which is less likely to cause separation of the electrode and the separator and reduces the risk of short circuit.

[0058] Further reading Figure 6The body 11 includes a main body 114 and a protrusion 115. The main body 114 includes an interconnected intermediate region 1141 and an edge region 1142, with the edge region 1142 surrounding the intermediate region 1141. The protrusion 115 protrudes from a portion of the intermediate region 1141. The protrusion 115 and the remaining portion of the intermediate region 1141 form a first liquid guiding groove 111, and the protrusion 115 and the edge region 1142 form a second liquid guiding groove 112. The second liquid guiding groove 112 has a bottom wall formed by the edge region 1142 and a side wall formed by the protrusion 115. A liquid guiding hole 113 is formed on the bottom wall of the second liquid guiding groove 112. This facilitates the formation of the first liquid guiding groove 111, the second liquid guiding groove 112, and the liquid guiding hole 113.

[0059] It is conceivable that there are no limitations on the formation of the first liquid guiding groove 111, the second liquid guiding groove 112 and the liquid guiding hole 113, and the structural configuration of the body 11 can also be selected as needed.

[0060] In some embodiments, see further reference. Figure 6 The main body 11 has a first liquid guiding groove 111, and one end surface of it is also provided with a liquid injection groove 116 opposite to the liquid injection hole 21. A second liquid guiding groove 112 is arranged around the first axis and surrounds the liquid injection groove 116. The first liquid guiding groove 111 connects the second liquid guiding groove 112 and the liquid injection groove 116. In this way, the electrolyte injected through the liquid injection hole 21 flows directly into the liquid injection groove 116, and then flows into the first liquid guiding groove 111, so as to facilitate the injection of electrolyte into the battery cell 1000.

[0061] See Figure 8 and Figure 9 The first liquid guiding groove 111 and the second liquid guiding groove 112 together form a liquid guiding channel. The liquid guiding channel has a first depth H along the first thickness direction Z. The body 11 has a first thickness H1 along the first thickness direction Z, where 1 / 3H1≤H≤2 / 3H1.

[0062] If the liquid flow channel is too deep, the insulation component 10 will be too weak and deform, affecting the electrical connection; if the liquid flow channel is too shallow, it will hinder the flow of electrolyte and affect the flow conduction effect. By setting 1 / 3H1≤H≤2 / 3H1, the insulation component 10 can be guaranteed to have good strength while the liquid flow channel can also have a good flow conduction effect.

[0063] Alternatively, H can be 1 / 3H1 or 2 / 3H1, etc., without restriction.

[0064] Further reading Figure 9The liquid guiding channel has a first width A, where A = H. It should be noted that the first width of the liquid guiding channel is its dimension in a first direction, which is perpendicular to the flow direction of the electrolyte within the channel. By setting A = H, good flow guiding effect of the liquid guiding channel can be ensured while maintaining good strength of the insulating component 10.

[0065] In some embodiments, see further reference. Figure 6 A notch 1131 is formed on the outward-facing side of the liquid guiding hole 113. Because the liquid guiding hole 113 has a notch 1131, a fluid channel can be formed between the side of the liquid guiding hole 113 with the notch 1131 and the casing, allowing the electrolyte to be injected into the casing through the fluid channel. At this time, the electrolyte flows closer to the inner wall of the casing, preventing it from directly impacting the battery cell assembly 100 when it enters the casing, thus further protecting the battery cell assembly 100.

[0066] It is conceivable that in some other embodiments, the liquid guiding hole 113 located on the edge of the body 11 may not have a notch 1131, as long as the liquid guiding hole 113 is as close as possible to the edge line of the body 11, which is not limited here.

[0067] Multiple liquid guiding holes 113 are distributed around the edge of the body 11 surrounding the first liquid guiding groove 111. Specifically, the second liquid guiding groove 112 is arranged around the body 11, and the liquid guiding holes 113 are provided at various locations along the circumferential edge of the body 11. This allows the electrolyte to enter the battery cell 1000 from multiple liquid guiding holes 113, preventing the electrolyte from concentrating in one liquid guiding hole 113 and flowing into the battery cell 1000, thus reducing impact.

[0068] The spacing between adjacent liquid guiding holes 113 is 1.5cm≤L≤2cm. This ensures that the number of liquid guiding holes 113 meets the requirements for good flow guiding effect without increasing the complexity of the manufacturing process.

[0069] Specifically, the spacing between adjacent liquid guiding holes 113 can be 1.5cm, 1.6cm, 1.7cm, 1.8cm, 1.9cm or 2cm, etc., and is not limited here.

[0070] In this application, the cross-sectional shape of the liquid guiding hole 113 is not limited. For example, the cross-sectional shape of the liquid guiding hole 113 can be square, triangular, or semi-circular. It should be noted that the cross-section of the liquid guiding hole 113 is the cross-section formed by cutting the body 11 through a plane perpendicular to the first thickness direction Z.

[0071] The liquid guiding hole 113 has a cross-sectional area S, where AH ≤ S. If the cross-sectional area of ​​the liquid guiding hole 113 is too small, it will affect the flow guiding effect. When AH ≤ S, the cross-sectional area of ​​the liquid guiding hole 113 can be ensured to be large enough, thereby improving the flow guiding effect of the liquid guiding hole 113.

[0072] In some embodiments, see further reference. Figure 6 The main body 11 has an explosion-proof through hole 117 extending along the first thickness direction Z, and the explosion-proof through hole 117 corresponds to the position of the explosion-proof valve on the cover plate 20. When the internal pressure or temperature of the battery cell 1000 rises abnormally, high-temperature or high-pressure flue gas flows through the explosion-proof through hole 117 to the explosion-proof valve, and the battery cell 1000 is prevented from exploding or violently rupturing by controlling the pressure relief.

[0073] Furthermore, the surface of the main body 11 where the first liquid guiding groove 111 is provided also has a third liquid guiding groove 118, which connects the first liquid guiding groove 111 and the explosion-proof through hole 117. In this way, the electrolyte injected through the injection hole 21 can flow from the first liquid guiding groove 111 to the third liquid guiding groove 118, and then from the third liquid guiding groove 118 to the explosion-proof through hole 117, ultimately flowing from the explosion-proof through hole 117 into the interior of the battery cell 1000 (see...). Figure 7 Since the third liquid guiding channel 118 connects the explosion-proof through hole 117 and the first liquid guiding channel 111, the explosion-proof through hole 117 serves to divert the electrolyte. Furthermore, because the third liquid guiding channel 118 connects the first liquid guiding channel 111 and the explosion-proof through hole 117, in the event of thermal runaway of the battery cell 1000, the flue gas sequentially flows through the liquid guiding hole 113, the second liquid guiding channel 112, the first liquid guiding channel 111, and the third liquid guiding channel 118, converging at the explosion-proof through hole 117, and finally flows out from the explosion-proof valve position on the cover plate 20 (see...). Figure 10 , Figure 10 The purple lines represent the direction of smoke flow.

[0074] The third liquid guiding groove 118 has a second depth along the first thickness direction Z, which is less than the first depth. Since the second depth is less than the first depth, most of the electrolyte in the liquid guiding channel flows into the second liquid guiding groove 112, and a small portion of the electrolyte flows into the third liquid guiding groove 118. This ensures that the electrolyte mainly flows to the edge of the insulating component 10, and a small portion flows from the explosion-proof through hole 117 to the cell assembly 100, thus diverting a small amount of electrolyte.

[0075] See Figure 11 A smoke guide groove 119 is provided on the other surface of the body 11 along the first thickness direction Z, opposite to the first liquid guide groove 111. The smoke guide groove 119 communicates with the explosion-proof through hole 117. The smoke guide groove 119 creates a cavity between the insulating component 10 and the cell assembly 100, which can gather the smoke generated by the thermal runaway of the battery cell 100 to the explosion-proof through hole 117. Figure 12 This facilitates the discharge of flue gas.

[0076] Furthermore, the smoke guide groove 119 has a third depth H2 along the first thickness direction Z, where 1 / 3H1≤H2≤1 / 2H1.

[0077] If the smoke guide groove 119 is too deep, the insulation component 10 will be too weak and deform, affecting the electrical connection; if the smoke guide groove 119 is too shallow, it will obstruct the flow of smoke and affect the smoke guiding effect. By setting 1 / 3H1≤H≤2 / 3H1, the insulation component 10 can be guaranteed to have good strength while the smoke guide groove 119 can also have a good smoke guiding effect.

[0078] Optionally, the main body 11 is provided with multiple smoke guide channels 119, which are radially distributed around the explosion-proof through hole 117. The multiple smoke guide channels 119 work together to guide smoke from all directions into the explosion-proof through hole 117, ensuring the smoke guiding effect.

[0079] The total area of ​​all the smoke guide channels 119 is S1, and the total area of ​​the explosion-proof through holes 117 is S2. S2≤S1≤1.5S2. It should be noted that S1 is the sum of the cross-sectional areas of all the smoke guide channels 119, and S2 is the cross-sectional area of ​​the explosion-proof through holes 117.

[0080] If the total area of ​​the smoke guide trough 119 is too small, it will be detrimental to the collection and discharge of flue gas or other gases. If the total area of ​​the smoke guide trough 119 is too large, it will affect the support effect of the location where the smoke guide trough 119 is set on the battery cell assembly 100. By setting S2≤S1≤1.5S2, while ensuring the gas collection and discharge effect, the location where the smoke guide trough 119 is set can provide sufficient support for the battery cell assembly 100 to stabilize the position of the battery cell assembly 100 in the housing.

[0081] In some embodiments, see further reference. Figure 3 The top cover assembly 200 also includes a pole post 30, which includes an interconnected pole tab connection portion 31 and an outer connection post 32. (Continue reading...) Figure 6 and Figure 11 The main body 11 has a receiving groove 1110 on the other end surface opposite to the first liquid guiding groove 111 along the first thickness direction Z. The surface of the main body 11 with the first liquid guiding groove 111 along the first thickness direction Z has an exposure hole 1120 and an electrode post hole 1130. Both the exposure hole 1120 and the electrode post hole 1130 communicate with the receiving groove 1110. The electrode tab connection part 31 is received in the receiving groove 1110 and can be exposed to the outside through the exposure hole 1120. The outer electrode post 30 passes through the electrode post hole 1130 and is connected to an external electrical connector. Since the electrode tab connection part 31 is received in the receiving groove 1110 on the main body 11, that is, the electrode tab connection part 31 is embedded in the insulating member 10, so as to reduce the space occupied by the electrode tab connection part 31 in the housing and improve the space utilization rate of the housing.

[0082] Continue reading Figure 10 The main body 11 has a tab hole 1140 extending through it along the first thickness direction Z. The tab 101 passes through the tab hole 1140 and is folded over to cover the part of the tab connection 31 exposed through the exposure hole 1120. Specifically, the folded tab 101 is welded to the tab connection 31 to achieve electrical connection between the tab 101 and the pole post 30.

[0083] In some embodiments, the exposure hole 1120 and the tab hole 1140 are interconnected. In other embodiments, the exposure hole 1120 may also be spaced apart from the tab hole 1140, which is not limited here.

[0084] Further reading Figure 5 The top cover assembly 200 also includes an insulating cover plate 40, which covers the side of the tab 101 facing away from the tab connection portion 31. The insulating cover plate 40 serves as both the insulating cover plate 20 and the tab 101.

[0085] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0086] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A top cover assembly, characterized in that, The top cover assembly includes a cover plate (20) and an insulating member (10) disposed on one side of the cover plate (20); The insulating component (10) includes a plate-shaped body (11). The surface of the body (11) facing the cover plate (20) along the first thickness direction (Z) is provided with a first liquid guiding groove (111) and a second liquid guiding groove (112). The first liquid guiding groove (111) communicates with a liquid injection hole (21) that penetrates the cover plate (20). The second liquid guiding groove (112) is located at the edge of the body (11) and surrounds the first liquid guiding groove (111) around a first axis that extends along the first thickness direction (Z). The edge of the body (11) is provided with a liquid guiding hole (113) in the first thickness direction (Z), and the second liquid guiding groove (112) connects the first liquid guiding groove (111) and the liquid guiding hole (113).

2. The top cover assembly according to claim 1, characterized in that, A notch (1131) is formed on the outward-facing side of the liquid guiding hole (113); and / or The body (11) includes a main body (114) and a protrusion (115). The main body (114) includes an interconnected intermediate region (1141) and an edge region (1142). The edge region (1142) surrounds the intermediate region (1141). The protrusion (115) protrudes from a portion of the intermediate region (1141). The protrusion (115) and the remaining portion of the intermediate region (1141) form the first liquid guiding groove (111). The protrusion (115) and the edge region (1142) form the second liquid guiding groove (112). The second liquid guiding groove (112) has a bottom wall formed by the edge region (1142) and a side wall formed by the protrusion (115). The liquid guiding hole (113) is opened on the bottom wall of the second liquid guiding groove (112).

3. The top cover assembly according to claim 1, characterized in that, The first liquid guiding groove (111) and the second liquid guiding groove (112) together form a liquid guiding channel; the liquid guiding channel has a first depth H along the first thickness direction (Z), and the body (11) has a first thickness H1 along the first thickness direction (Z); 1 / 3H1≤H≤2 / 3H1; and / or The liquid guiding channel has a first depth H along the first thickness direction (Z), and the liquid guiding channel has a first width A, where A = H.

4. The top cover assembly according to claim 1, characterized in that, The first liquid guiding groove (111) and the second liquid guiding groove (112) together form a liquid guiding channel; the liquid guiding hole (113) has a cross-sectional area S, the liquid guiding channel has a first depth H along the first thickness direction (Z), and the liquid guiding channel has a first width A; AH≤S; and / or The body (11) has a first liquid guiding groove (111) on one end surface, and a liquid injection groove (116) is provided that is directly opposite to the liquid injection hole (21). The second liquid guiding groove (112) surrounds the first axis and is located outside the liquid injection groove (116). The first liquid guiding groove (111) connects the second liquid guiding groove (112) and the liquid injection groove (116).

5. The top cover assembly according to claim 1, characterized in that, The body (11) has a plurality of liquid guiding holes (113) around the edge of the first liquid guiding groove (111); and / or An explosion-proof through hole (117) is provided on the body (11) along the first thickness direction (Z).

6. The top cover assembly according to claim 5, characterized in that, The surface of the body (11) having the first liquid guiding groove (111) is also provided with a third liquid guiding groove (118), the third liquid guiding groove (118) connecting the first liquid guiding groove (111) and the explosion-proof through hole (117); the first liquid guiding groove (111) and the second liquid guiding groove (112) together form a liquid guiding channel; the liquid guiding channel has a first depth along the first thickness direction (Z), and the third liquid guiding groove (118) has a second depth along the first thickness direction (Z), the second depth being less than the first depth; and / or The body (11) has a smoke guide groove (119) on the other end surface opposite to the first liquid guide groove (111) along the first thickness direction (Z), and the smoke guide groove (119) is connected to the explosion-proof through hole (117).

7. The top cover assembly according to claim 6, characterized in that, The smoke guide groove (119) has a third depth H2 along the first thickness direction (Z), and the body (11) has a first thickness H1 along the first thickness direction (Z), where 1 / 3H1≤H2≤1 / 2H1; and / or The total area S1 of all the smoke guide grooves (119) and the total area S2 of the explosion-proof through hole (117) satisfy the relationship: S2≤S1≤1.5S2.

8. The top cover assembly according to claim 6, characterized in that, The main body (11) is provided with multiple smoke guide grooves (119), which are radially distributed around the explosion-proof through hole (117).

9. The top cover assembly according to claim 1, characterized in that, The body (11) has a receiving groove (1110) on the other end surface away from the first liquid guiding groove (111) along the first thickness direction (Z). The surface of the body (11) with the first liquid guiding groove (111) along the first thickness direction (Z) has an exposure hole (1120) and an electrode hole (1130) that are both connected to the receiving groove (1110). The receiving groove (1110) is used to receive the tab connection part (131), the exposure hole (1120) is used to expose the tab connection part (131), and the pole hole (1130) is for the pole (30) to pass through; The body (11) is provided with a tab hole (1140) through it along the first thickness direction (Z). The tab hole (1140) allows the tab to pass through and be folded to connect with the exposed part of the tab connection part (131).

10. A single battery cell, characterized in that, Includes a cell assembly (100) and a top cover assembly (200) as claimed in any one of claims 1-9, wherein the insulating member is insulated between the cell assembly (100) and the cover plate (20).

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