Insulating member, cover plate assembly, battery, and electric device

Abstract

The application belongs to the technical field of batteries, and provides an insulating piece, a cover plate assembly, a battery and an electric device. The insulating piece has opposite first and second surfaces, one of the first and second surfaces is arranged to face the cover plate; the insulating piece has a buffer area, at least part of the buffer area is arranged to face the anti-explosion valve on the cover plate in the thickness direction; on the buffer area, the first surface side has a first blind hole, and the second surface side has a second blind hole, the orthographic projection of the first blind hole in the thickness direction and the orthographic projection of the second blind hole in the thickness direction are at least partially staggered, and the first blind hole is in communication with the second blind hole. The insulating piece provided by the application can effectively reduce the impact force of the electrolyte, and is easy to process and has low cost.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to an insulating component, a cover assembly, a battery, and an electrical device. Background Technology

[0002] Lithium-ion batteries are widely used in consumer electronics, electric vehicles, energy storage systems, and other fields, and their safety is of paramount importance.

[0003] Lithium-ion batteries include an explosion-proof valve. When the internal pressure of the battery abnormally increases, the explosion-proof valve opens to release gas or liquid from the battery, preventing it from exploding due to excessive internal pressure. During use, external impacts such as drops and vibrations can cause internal cell displacement, compressing the electrolyte. This compressed electrolyte creates an impact force that acts on the explosion-proof valve, accidentally triggering it and causing it to open. Accidental opening of the explosion-proof valve reduces battery safety and lifespan. Related technologies may incorporate baffles or louver structures on the insulating components to mitigate the impact of the electrolyte on the pressure relief valve; however, these solutions are complex to manufacture, costly, and have limited buffering effect.

[0004] Therefore, there is an urgent need for a solution that can effectively mitigate electrolyte shock, is easy to process, and has a low cost. Utility Model Content

[0005] This application provides an insulating element, a cover assembly, a battery, and an electrical device. The insulating element in the cover assembly can effectively mitigate the impact of electrolyte and is easy to process and has a low cost.

[0006] This application provides an insulating member having a first surface and a second surface facing each other, one of which is disposed facing a cover plate; the insulating member has a buffer area, at least a portion of which is disposed opposite to an explosion-proof valve on the cover plate along the thickness direction; in the buffer area, a first blind hole is provided on one side of the first surface and a second blind hole is provided on one side of the second surface, the orthographic projection of the first blind hole along the thickness direction and the orthographic projection of the second blind hole along the thickness direction are at least partially offset, and the first blind hole and the second blind hole are connected.

[0007] In one possible implementation, the insulating member provided in this application has an orthographic projection of the first blind hole along the thickness direction and an orthographic projection of the second blind hole along the thickness direction that at least partially overlap, and the orthographic projection of the first blind hole along a first direction and the orthographic projection of the second blind hole along the first direction that at least partially overlap, so as to form a connecting channel between the first blind hole and the second blind hole; wherein, the first direction intersects the thickness direction.

[0008] And / or, the second surface faces the cover plate, the insulating element has a first boss, the first boss protrudes from one side of the first surface in a direction away from the second surface, the buffer area is located on the first boss, the first boss is used to abut against the cell assembly.

[0009] In one possible implementation, the insulating member provided in this application has a first recessed portion, which is recessed from one side of the second surface in a direction toward the first surface, and the first recessed portion and the first boss are disposed opposite to each other in the thickness direction.

[0010] And / or, the area on the first boss other than the buffer area is provided with multiple through holes that penetrate the first boss along the thickness direction.

[0011] In one possible implementation, the insulating member provided in this application has a flange extending from one side of the second surface in a direction away from the first surface, and the flange has at least one notch communicating with the first recess.

[0012] And / or, the first boss of the insulating member has a groove, the groove being recessed from one side of the first surface in a direction toward the second surface, the groove communicating with at least a portion of the through hole, and / or, the groove communicating with a plurality of spaced-apart first blind holes.

[0013] In one possible implementation, the insulating member provided in this application has a second boss that protrudes from one side of the second surface in a direction away from the first surface; the second boss is adapted to abut against the cover plate.

[0014] And / or, the insulating member has a second recess, which is recessed from one side of the first surface toward the second surface, and the second recess and the second boss are disposed opposite each other in the thickness direction.

[0015] This application also provides a cover plate assembly, including a cover plate, an explosion-proof valve, and the aforementioned insulating member. The explosion-proof valve is disposed on the cover plate. The insulating member is disposed on one side of the cover plate along the thickness direction and connected to the cover plate, with one of the first and second surfaces of the insulating member facing the cover plate. At least a portion of the buffer area of ​​the insulating member and the explosion-proof valve are opposite each other along the thickness direction.

[0016] In one possible implementation, the cover plate assembly provided in this application includes an insulating member comprising a second boss, one of the second boss and the cover plate having a positioning post and the other having a positioning groove, the positioning post being inserted into the positioning groove;

[0017] And / or, the cover plate assembly further includes a pole post having a first mounting hole on the cover plate and a second mounting hole on the insulator, the pole post passing through the first mounting hole and the second mounting hole to connect the insulator and the cover plate.

[0018] This application also provides a battery, including a cell assembly, a casing, and the aforementioned cover assembly. The casing has a receiving cavity, and the end of the casing along its extension direction has an opening that communicates with the receiving cavity. The cell assembly is located in the receiving cavity, and the cover assembly covers the end of the casing and seals the opening. An insulating member is located between the cover and the cell assembly, and the casing is filled with an electrolyte. The extension direction of the casing is consistent with the thickness direction.

[0019] In one possible implementation, the battery provided in this application has a cover plate connected to the outer casing, and an insulating component with a gap between it and the outer casing.

[0020] In one possible implementation, the battery provided in this application includes a cell assembly comprising a cell and a current collector, the cell being electrically connected to the current collector; the current collector is located between the insulator and the cell, and the cover assembly includes terminals, the terminals being electrically connected to the current collector.

[0021] In one possible implementation, the battery provided in this application includes a collector plate body and a bent portion;

[0022] The insulating part has a second recess that is recessed from one side of the first surface toward the second surface; at least a portion of the bent portion is located in the second recess.

[0023] In one possible implementation, the battery provided in this application has a second recess whose sidewall extends outward from the bottom wall of the second recess along the direction from the second surface to the first surface.

[0024] In one possible implementation, the battery provided in this application has a first boss on the insulating member, the first boss protruding from one side of the first surface in a direction away from the second surface;

[0025] The first protrusion abuts against the main body of the collector plate; the orthogonal projection area of ​​the first protrusion on the collector plate along the thickness direction is greater than 1 / 3 of the cross-sectional area of ​​the collector plate perpendicular to the thickness direction.

[0026] In one possible implementation, the battery provided in this application has two cover assemblies, which are disposed on both ends of the outer casing along the extension direction of the outer casing.

[0027] This application also provides a battery cell, including the battery described above.

[0028] This application also provides a battery module, including one or more of the above-described batteries; and / or, including one or more of the above-described battery cells.

[0029] This application also provides a battery pack, including one or more of the above-described batteries; and / or, including one or more of the above-described battery cells; and / or, including one or more of the above-described battery modules.

[0030] This application also provides an electrical device including the aforementioned battery.

[0031] The insulating component provided in this application has at least a partial buffer area of ​​the insulating component and an explosion-proof valve located on the cover plate facing each other along the thickness direction. Furthermore, a first blind hole is provided on one side of the first surface and a second blind hole is provided on one side of the second surface in the buffer area, such that the orthographic projections of the first and second blind holes along the thickness direction are at least partially offset. Therefore, when the electrolyte with a large impact force enters the first blind hole along the thickness direction, it will impact at least a portion of the bottom wall of the first blind hole and will not directly enter the second blind hole. The bottom wall of the first blind hole can reduce the impact force of the electrolyte. Since the first and second blind holes are connected, the impact force is already reduced when the electrolyte flows through the first blind hole and then into the second blind hole. Thus, the impact force exerted by the electrolyte on the explosion-proof valve is reduced, preventing accidental opening of the explosion-proof valve. Providing the first and second blind holes on opposite surfaces respectively reduces the processing cost of the insulating component, thereby making the cover plate assembly easier to process and lower in cost. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the battery structure provided in an embodiment of this application;

[0034] Figure 2 An explosion diagram of a battery provided in an embodiment of this application;

[0035] Figure 3 A partial structural diagram of the internal structure of the battery provided in an embodiment of this application;

[0036] Figure 4 This is a schematic diagram of the structure of the cover plate assembly provided in an embodiment of this application;

[0037] Figure 5 for Figure 4 An explosion diagram;

[0038] Figure 6 This is a schematic diagram of the structure of the insulating component in the cover plate assembly provided in the embodiments of this application;

[0039] Figure 7 This is another structural schematic diagram of the insulating component in the cover plate assembly provided in the embodiments of this application;

[0040] Figure 8A cross-sectional schematic diagram of the insulating component in the cover plate assembly provided in this application embodiment;

[0041] Figure 9 This is a schematic diagram of the structure of the battery cell assembly and insulating components provided in the embodiments of this application;

[0042] Figure 10 This is a schematic diagram of the current collector in a battery provided in an embodiment of this application.

[0043] Explanation of reference numerals in the attached figures:

[0044] 10-cell battery;

[0045] 100-Battery Cell Assembly;

[0046] 110 - Battery cell; 120 - Current collector; 121 - Current collector body; 122 - Bending section;

[0047] 200 - Outer casing;

[0048] 300 - Cover plate assembly;

[0049] 310 - Cover plate; 311 - Positioning groove; 312 - First mounting hole;

[0050] 320 - Explosion-proof valve;

[0051] 330 - Insulating component; 330a - First surface; 330b - Second surface; 330c - Buffer area;

[0052] 331-First blind hole; 3311-First bottom wall; 3312-First side wall; 3313-Groove;

[0053] 332 - Second blind hole; 3321 - Second bottom wall; 3322 - Second side wall;

[0054] 333 - Connecting Channel;

[0055] 3341 - First protrusion; 3342 - First recess;

[0056] 335 - Through hole;

[0057] 336 - Flange; 3361 - Notch;

[0058] 3371 - Second boss; 3371a - Positioning post;

[0059] 3372 - Second recess; 3372a - Third bottom wall; 3372b - Third side wall;

[0060] 338 - Second mounting hole;

[0061] 340 - First sealing ring; 350 - Second sealing ring; 360 - Connecting part;

[0062] 400-Pole Column;

[0063] A-gap;

[0064] L - Extension direction;

[0065] W - Thickness direction; W1 - First dimension; W2 - Second dimension; W3 - Third dimension;

[0066] X - First direction. Detailed Implementation

[0067] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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 some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0068] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0069] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0070] The terms "first," "second," and "third" (if any) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0071] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such as a process, method, system, product, or maintenance tool that includes a series of steps or units, not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or maintenance tool.

[0072] Lithium-ion batteries are widely used in consumer electronics, electric vehicles, energy storage systems, and other fields, and their safety is of paramount importance.

[0073] A lithium-ion battery consists of a casing and a cell. The cell is located inside the casing, which is filled with electrolyte. An explosion-proof valve is installed on the casing. When the internal pressure of the battery abnormally increases, the explosion-proof valve opens to release the gas or liquid inside the battery, thereby preventing the battery from exploding due to excessive internal pressure.

[0074] During the use of lithium-ion batteries, external impacts such as drops and vibrations may cause internal cell displacement. The cells will compress the electrolyte in the direction of displacement, creating an impact force. This impact force acts on the explosion-proof valve, accidentally triggering it and causing it to open unintentionally. Unintentional opening of the explosion-proof valve will cause electrolyte leakage, thereby reducing battery safety and lifespan.

[0075] In related technologies, baffles can be installed at the corresponding positions of the insulating component and the explosion-proof valve. These baffles can mitigate the impact of the electrolyte. However, installing baffles on the side complicates the molding of the insulating component and increases costs. Alternatively, additional baffles can be assembled onto the insulating component, which also complicates the assembly process and increases costs. Louvers can also be installed on the insulating component to reduce the impact of the electrolyte, but their manufacturing cost is also high. Flow channels can be installed at misaligned positions between the insulating component and the explosion-proof valve, but this provides poor buffering and hinders venting.

[0076] Based on this, embodiments of this application provide an insulating component, a cover plate assembly, a battery, and an electrical device. The insulating component in the cover plate assembly can effectively reduce the impact force of the electrolyte and is easy to process and has a low cost.

[0077] Figure 1 This is a schematic diagram of the battery structure provided in an embodiment of this application; Figure 2 An explosion diagram of a battery provided in an embodiment of this application; Figure 3 This is a partial structural diagram of the internal structure of a battery provided in an embodiment of this application.

[0078] See Figures 1 to 3As shown, the battery 10 includes a cell assembly 100, a housing 200, and a cover assembly 300. The housing 200 has a receiving cavity, and the end of the housing 200 along its extending direction has an opening that communicates with the receiving cavity. The cell assembly 100 is located in the receiving cavity. The cover assembly 300 covers the end of the housing 200 along the extending direction L of the housing and seals the opening. The housing 200 is filled with electrolyte.

[0079] Battery 10 can be a lithium-ion battery or other types of batteries; this embodiment uses a lithium-ion battery as an example for illustration. Cell assembly 100 includes a positive electrode, a negative electrode, and a separator, which are stacked together.

[0080] The outer shell 200 can be a cuboid, cylinder, or elliptical cylinder, etc. Figures 1 to 3 In the embodiment shown, the outer casing 200 is a cylinder. The axial direction of the outer casing 200 is the extension direction L.

[0081] The battery cell assembly 100 is located within the housing 200. There can be two cover plate assemblies 300, which are disposed at both ends of the housing 200 along the extending direction L of the housing 200. Figures 1 to 3 A cover assembly 300 is shown. The housing 200 is filled with electrolyte, and the cover assembly 300 can be connected to the housing 200 to prevent electrolyte leakage or the cell assembly 100 from detaching from the housing 200.

[0082] During charging, lithium ions from the positive electrode and the electrolyte pass through the separator to the negative electrode, where they gain electrons and are reduced to lithium, which is then embedded in the negative electrode. During discharging, the lithium embedded in the negative electrode loses electrons and enters the electrolyte, while the lithium ions in the electrolyte return to the positive electrode. This cycle continues, completing the charging and discharging process of a lithium-ion battery.

[0083] The specific structure of the cover plate assembly 300 will be described below.

[0084] Figure 4 This is a schematic diagram of the structure of the cover plate assembly provided in an embodiment of this application; Figure 5 for Figure 4 An explosion diagram; Figure 6 This is a schematic diagram of the structure of the insulating component in the cover plate assembly provided in the embodiments of this application; Figure 7 This is another structural schematic diagram of the insulating component in the cover plate assembly provided in the embodiments of this application; Figure 8 This is a cross-sectional schematic diagram of the insulating component in the cover plate assembly provided in an embodiment of this application. Wherein, in Figure 4 and Figure 5 The image also shows pole 400.

[0085] See Figures 3 to 8As shown, the cover plate assembly 300 includes a cover plate 310, an explosion-proof valve 320, and an insulating member 330. The explosion-proof valve 320 is disposed on the cover plate 310. The insulating member 330 is disposed on one side of the cover plate 310 along the thickness direction W and is connected to the cover plate 310. The insulating member 330 has a first surface 330a and a second surface 330b that are opposite each other along the thickness direction W, and one of the first surface 330a and the second surface 330b faces the cover plate 310. The insulating member 330 has a buffer region 330c, at least a portion of the buffer region 330c and the explosion-proof valve 320 are opposite each other along the thickness direction W. In the buffer region 330c, a first blind hole 331 is provided on the first surface 330a side, and a second blind hole 332 is provided on the second surface 330b side. The orthographic projection of the first blind hole 331 along the thickness direction W and the orthographic projection of the second blind hole 332 along the thickness direction W are at least partially offset, and the first blind hole 331 and the second blind hole 332 are connected.

[0086] In this embodiment, the thickness direction W of the cover plate 310 is the same as the extension direction L of the outer shell 200. The edge of the cover plate 310 can be connected to the outer shell 200, for example, the edge of the cover plate 310 can be welded to the outer shell 200. The insulating member 330 is located on the side of the cover plate 310 facing the cell assembly 100. The insulating member 330 is located between the cover plate 310 and the cell assembly 100 along the extension direction L and is connected to the cover plate 310. The insulating member 330 is used to separate the cell assembly 100 and the cover plate 310, thereby preventing a short circuit between the cell assembly 100 and the cover plate 310. One of the first surface 330a and the second surface 330b faces the cover plate 310. In this embodiment, the side of the insulating member 330 facing the cell assembly 100 is the first surface 330a, and the side of the insulating member 330 facing the cover plate 310 is the second surface 330b.

[0087] The cover plate 310 has an explosion-proof valve mounting hole, and the explosion-proof valve 320 can be installed in the explosion-proof valve mounting hole. When the pressure in the housing 200 is too high, the explosion-proof valve 320 opens, and the gas or liquid in the housing 200 can be discharged from the explosion-proof valve 320.

[0088] The insulating component 330 has a buffer region 330c, at least a portion of which is opposite to the explosion-proof valve 320 along the thickness direction. That is, the projected area of ​​the buffer region 330c along the thickness direction W can be greater than or equal to the projected area of ​​the explosion-proof valve 320 along the thickness direction. When the battery 10 is subjected to an external force causing the cell assembly 100 to move along the extension direction L within the housing 200, the compressed electrolyte generates an impact force. The buffer region 330c can mitigate the impact of the electrolyte on the explosion-proof valve 320, thereby preventing the explosion-proof valve 320 from opening accidentally.

[0089] Please continue reading Figure 6 and Figure 8As shown, in the buffer region 330c, a first blind hole 331 is formed on one side of the first surface 330a. There can be one or more first blind holes 331. The orthographic projection of the first blind hole 331 along the thickness direction can be circular, elliptical, or polygonal. Figure 6 and Figure 8 The diagram shows multiple first blind holes 331, each of which has a circular orthographic projection along the thickness direction W. Each first blind hole 331 has a first bottom wall 3311 and a first side wall 3312.

[0090] Please continue reading Figure 7 and Figure 8 As shown, a second blind hole 332 is formed on one side of the second surface 330b in the buffer region 330c. There can be one or more second blind holes 332. The orthographic projection of the second blind hole 332 along the thickness direction W can be circular, elliptical, or polygonal. Figure 7 and Figure 8 The diagram shows multiple second blind holes 332, each of which has a circular orthographic projection along the thickness direction W. Each second blind hole 332 has a second bottom wall 3321 and a second side wall 3322.

[0091] The orthographic projection of the second blind hole 332 along the thickness direction W is at least partially offset from the orthographic projection of the second blind hole 332 along the thickness direction W. Therefore, when the electrolyte with a larger impact force enters the first blind hole 331 along the thickness direction W, it will impact at least a portion of the first bottom wall 3311 of the first blind hole 331, and will not directly enter the second blind hole 332. The first bottom wall 3311 can absorb part of the impact force of the electrolyte, thereby reducing the impact force. The first blind hole 331 and the second blind hole 332 are connected. When the electrolyte flows through the first blind hole 331 and then enters the second blind hole 332, the impact force is already smaller. Therefore, the impact force exerted by the electrolyte on the explosion-proof valve 320 located on the second surface 330b side is smaller, which can prevent the explosion-proof valve 320 from being accidentally opened.

[0092] The insulating component 330 has a first blind hole 331 and a second blind hole 332 respectively formed on its two opposing surfaces to reduce the impact of the electrolyte. The processing of the first blind hole 331 and the second blind hole 332 is relatively simple. For example, the first blind hole 331 and the second blind hole 332 can be processed by drilling, milling or laser drilling according to the specific material of the insulating component 330. Compared with the use of molds to process the insulating component in related technologies, the processing cost of the insulating component 330 in the cover plate assembly 300 provided in this application embodiment is lower, thereby making the cover plate assembly 300 easy to process and low in cost.

[0093] This application embodiment also provides an insulating member 330, which has a first surface 330a and a second surface 330b facing each other, one of which is arranged to face the cover plate 310; the insulating member 330 has a buffer region 330c, at least a portion of which is arranged to be opposite to the explosion-proof valve 320 on the cover plate 310 along the thickness direction W; in the buffer region 330c, a first blind hole 331 is provided on the first surface 330a side and a second blind hole 332 is provided on the second surface 330b side, the orthographic projection of the first blind hole 331 along the thickness direction W and the orthographic projection of the second blind hole 332 along the thickness direction W are at least partially offset, and the first blind hole 331 and the second blind hole 332 are connected.

[0094] The insulating member 330 provided in this application embodiment is such that at least a portion of the buffer area 330c of the insulating member 330 and the explosion-proof valve 320 located on the cover plate 310 are opposite each other along the thickness direction W; and at the buffer area 330c, a first blind hole 331 is provided on the first surface 330a side and a second blind hole 332 is provided on the second surface 330b side, such that the orthographic projection of the first blind hole 331 along the thickness direction W and the orthographic projection of the second blind hole 332 along the thickness direction W are at least partially offset. As a result, when the electrolyte with a large impact force enters the first blind hole 331 along the thickness direction W, it will hit at least a portion of the bottom wall of the first blind hole 331 and will not directly enter the second blind hole 332. The bottom wall of the first blind hole 331 can mitigate the impact force of the electrolyte. The first blind hole 331 is connected to the second blind hole 332. When the electrolyte flows through the first blind hole 331 and then into the second blind hole 332, the impact force is already relatively small. Therefore, the impact force exerted by the electrolyte on the explosion-proof valve 320 is reduced, preventing the explosion-proof valve 320 from opening accidentally. Providing the first blind hole 331 and the second blind hole 332 on two opposite surfaces reduces the processing cost of the insulating component 330, thereby making the cover assembly 300 easier to process and lower in cost. Please continue to participate. Figure 8 As shown, in one possible implementation, the orthographic projection of the first blind hole 331 along the thickness direction W and the orthographic projection of the second blind hole 332 along the thickness direction W at least partially overlap, and the orthographic projection of the first blind hole 331 along the first direction X at least partially overlaps with the orthographic projection of the second blind hole 332 along the first direction X, so as to form a connecting channel 333 between the first blind hole 331 and the second blind hole 332; wherein the first direction X intersects the thickness direction W.

[0095] Please continue reading Figure 4 and Figure 8 As shown, the first direction X refers to any direction on the plane intersecting the thickness direction W. In Figure 4 In this context, the first direction X is any direction on a plane perpendicular to the thickness direction W.

[0096] In the buffer region 330c, the insulating member 330 has a first dimension W1 along the thickness direction W, the first blind hole 331 has a second dimension W2 along the thickness direction W, and the second blind hole 332 has a third dimension W3 along the thickness direction W. The sum of the second dimension W2 and the third dimension W3 is greater than the first dimension W1. For example, the second dimension W2 can be greater than half of the first dimension W1, and the third dimension W3 can be greater than half of the first dimension W1. Therefore, when the first blind hole 331 and the second blind hole 332 are projected along the first direction X, the orthographic projection of the first blind hole 331 along the first direction X at least partially overlaps with the orthographic projection of the second blind hole 332 along the first direction X.

[0097] In addition, the distance between the center of the first blind hole 331 and the center of the second blind hole 332 is adjusted, and the projected area of ​​the first blind hole 331 along the thickness direction W and the projected area of ​​the second blind hole 332 along the thickness direction W are adjusted, so that the orthographic projection of the first blind hole 331 along the thickness direction W and the orthographic projection of the second blind hole 332 along the thickness direction W at least partially overlap.

[0098] By overlapping the orthographic projections of the first blind hole 331 and the second blind hole 332 along the thickness direction W and along the first direction X, the overlapping areas will naturally connect during the machining process, forming a connecting channel 333. Both the first blind hole 331 and the second blind hole 332 are connected to the connecting channel 333. Therefore, no additional machining steps are required to connect the first blind hole 331 and the second blind hole 332, resulting in lower machining costs for the insulating component 330.

[0099] When the electrolyte enters the second blind hole 332 from the first blind hole 331 through the connecting channel 333, the electrolyte enters the second blind hole 332 along the first direction X. Since the explosion-proof valve 320 is opposite to the insulating member 330 along the thickness direction W, when the electrolyte enters the second blind hole 332 along the first direction X, the impact force of the electrolyte on the explosion-proof valve 320 along the thickness direction W can be further reduced.

[0100] Please continue reading Figure 6 As shown, in one possible implementation, the insulating member 330 has a first boss 3341 that protrudes from the first surface 330a in a direction away from the second surface 330b, and a buffer region 330c is located on the first boss 3341. The first boss 3341 is used to abut against the cell assembly 100.

[0101] Therefore, when the cell assembly 100 moves toward the cover assembly 300 along the thickness direction W (that is, the extension direction L of the outer shell 200), the first protrusion 3341 can stop the cell assembly 100, thereby reducing the amount of movement of the cell assembly 100. The smaller the amount of movement of the cell assembly 100, the smaller the compression ratio of the cell assembly 100 on the electrolyte, and the smaller the impact force of the electrolyte.

[0102] In addition, the buffer area 330c is located on the first boss 3341. The combination of the two measures, namely reducing the movement of the battery cell assembly 100 by the first boss 3341 to reduce the impact force of the electrolyte and reducing the impact force of the electrolyte by the first blind hole 331 and the second blind hole 332 on the buffer area 330c, further reduces the impact force of the electrolyte on the explosion-proof valve 320.

[0103] Please continue reading Figure 7 As shown, in one possible embodiment, the insulating member 330 has a first recess 3342, which is recessed from the second surface 330b side in the direction toward the first surface 330a, and the first recess 3342 and the first boss 3341 are disposed opposite each other in the thickness direction W.

[0104] The space between the first recess 3342 and the cover plate 310 can form a buffer cavity, in which the electrolyte flowing out from the second blind hole 332 can be temporarily stored, thereby further reducing the impact force of the electrolyte.

[0105] Please continue reading Figure 6 and Figure 7 As shown, in one possible implementation, the first boss 3341 is provided with a plurality of through holes 335 extending through the first boss 3341 along the thickness direction W in the area other than the buffer area 330c.

[0106] A through hole 335 is provided on the first boss 3341 in the area other than the buffer area 330c. Some electrolyte can also flow into the buffer chamber through the through hole 335. As a result, the amount of electrolyte passing through the buffer area 330c is small, which can further reduce the impact force of the electrolyte on the explosion-proof valve 320.

[0107] Please continue reading Figure 6 As shown, in one possible implementation, the first boss 3341 of the insulating member 330 has a groove 3313, which is recessed from the first surface 330a in a direction toward the second surface 330b. The groove 3313 communicates with at least a portion of the through hole 335, and / or the groove 3313 communicates with a plurality of spaced first blind holes 331.

[0108] Therefore, when the cell assembly 100 is attached to the first boss 3341, the gas in the cell assembly 100 can enter the through hole 335 or the first blind hole 331 through the groove 3313, and then enter the buffer chamber through the through hole 335 or the first blind hole 331, and then be discharged through the explosion-proof valve 320, so that the gas can be discharged smoothly.

[0109] Please continue reading Figure 6 and Figure 7 As shown, in one possible embodiment, the insulating member 330 has a flange 336 extending from the second surface 330b in a direction away from the first surface 330a, and the flange 336 has at least one notch 3361 communicating with the first recess 3342.

[0110] In other words, the flange 336 can extend from the periphery of the insulating member 330 toward the cover plate 310, and the flange 336 can abut against the cover plate 310. A notch 3361 can be formed on the flange 336, or multiple notches 3361 can be formed at intervals along the periphery of the insulating member 330 on the flange 336.

[0111] The notch 3361 is connected to the first recess 3342, and the electrolyte entering the first recess 3342 can flow from the notch 3361 to the periphery of the insulating member 330, thereby further reducing the impact force of the electrolyte on the explosion-proof valve 320.

[0112] In addition, please continue to see Figure 3 As shown, the projected area of ​​the insulating member 330 along the extension direction L can be smaller than the projected area of ​​the cover plate 310 along the extension direction L, thereby allowing a gap A between the insulating member 330 and the outer shell 200.

[0113] The gas in gap A can also enter the first recess 3342 through the notch 3361 so that it can be discharged from the explosion-proof valve 320.

[0114] Please continue reading Figure 7 As shown, in one possible embodiment, the insulating member 330 has a second boss 3371 that protrudes from the second surface 330b in a direction away from the first surface 330a; the second boss 3371 is adapted to abut against the cover plate 310.

[0115] The second boss 3371 and the flange 336 simultaneously abut against the cover plate 310, thereby increasing the reliability of the contact between the insulating component 330 and the cover plate 310, and making the cover plate assembly 300 have high structural reliability.

[0116] In one possible implementation, one of the second boss 3371 and the cover plate 310 has a positioning post 3371a and the other has a positioning groove 311, with the positioning post 3371a inserted into the positioning groove 311.

[0117] exist Figure 5 and Figure 7 In the illustrated embodiment, the positioning post 3371a is disposed on the second boss 3371, and the positioning groove 311 is disposed on the cover plate 310. When assembling the cover plate assembly 300, the positioning post 3371a is aligned with the positioning groove 311, and then the positioning post 3371a is inserted into the positioning groove 311. This allows the explosion-proof valve 320 on the cover plate 310 to be aligned with at least a portion of the buffer area 330c, preventing misalignment between the explosion-proof valve 320 and the buffer area 330c.

[0118] The specific structure of the battery cell assembly 100 and the lead-out method of the battery cell assembly 100 will be described below.

[0119] Figure 9 This is a schematic diagram of the structure of the battery cell assembly and insulating components provided in the embodiments of this application; Figure 10 This is a schematic diagram of the current collector in a battery provided in an embodiment of this application.

[0120] See Figures 3 to 5 as well as Figure 9 and Figure 10 As shown, the battery cell assembly 100 includes a battery cell 110 and a current collector 120, with the battery cell 110 and current collector 120 being electrically connected. The current collector 120 is located between the insulator 330 and the battery cell 110. The cover plate assembly 300 also includes a terminal post 400, which is electrically connected to the current collector 120.

[0121] In the above embodiments, the positive electrode, negative electrode, and separator are stacked and wound to form the battery cell 110. Multiple tabs can be provided on both the positive and negative electrode sheets, and these tabs are welded to the current collector 120, thereby electrically connecting the battery cell 110 to the current collector 120. It is understood that there are two current collectors 120, located at opposite ends of the battery cell 110 along the extending direction L of the outer casing 200. The tabs on the positive electrode are electrically connected to one of the current collectors 120, and the tabs on the negative electrode are electrically connected to the other current collector 120. One end of the terminal post 400 is welded to the current collector 120, thereby electrically connecting it to the battery cell 110 through the current collector 120. It is understandable that there are two terminals 400. The two terminals 400 are located at both ends of the cell 110 along the extension direction L. The terminal 400 that is electrically connected to the tab on the positive electrode plate forms the positive electrode of the battery 10, and the terminal 400 that is electrically connected to the tab on the negative electrode plate forms the negative electrode of the battery 10.

[0122] Please continue reading Figure 4 and Figure 5 As shown, the cover plate 310 has a first mounting hole 312, and the insulating member 330 has a second mounting hole 338. The electrode post 400 passes through the first mounting hole 312 and the second mounting hole 338. The cover plate assembly 300 also includes a connector 360. The end of the electrode post 400 facing away from the current collector 120 is connected to the connector 360. Thus, the electrode post 400 can be fixed on the cover plate assembly 300, and the cover plate 310 and the insulating member 330 can be connected through the electrode post 400 and the connector 360. Please continue to see Figure 3 and Figure 5 As shown, the cover plate assembly 300 also includes a first sealing ring 340 and a second sealing ring 350, which are sleeved on the pole post 400 to prevent the pole post 400 from short-circuiting with the cover plate 310.

[0123] Please continue reading Figure 6 , Figure 9 and Figure 10 As shown, the collector plate 120 includes a collector plate body 121 and a bent portion 122; the insulating member 330 has a second recess 3372, which is recessed from the first surface 330a side in the direction toward the second surface 330b, and the second recess 3372 and the second boss 3371 are disposed opposite each other in the thickness direction W; at least a portion of the bent portion 122 is located in the second recess 3372.

[0124] Both the second recess 3372 and the first boss 3341 are located on one side of the first surface 330a of the insulating member 330. The second recess 3372 and the second boss 3371 are disposed on both sides of the insulating member 330 along the thickness direction W. The projected area of ​​the second recess 3372 along the thickness direction W can be slightly larger than the projected area of ​​the bent portion 122 along the thickness direction W. By providing the second recess 3372 and making the bent portion 122 of the current collector 120 located in the second recess 3372, the first boss 3341 can stop the cell assembly 100 while the insulating member 330 does not affect the electrical connection between the current collector 120 and the terminal post 400.

[0125] In one possible implementation, along the direction from the second surface 330b to the first surface 330a, the sidewall of the second recess 3372 extends outward from the bottom wall of the second recess 3372.

[0126] The second recess 3372 has a third bottom wall 3372a and a third side wall 3372b surrounding the third bottom wall 3372a. The third side wall 3372b extends outward from the third bottom wall 3372a. For example, the angle between the third bottom wall 3372a and the thickness direction W can be 1°-10°, so that the cross-section of the second recess 3372 forms an inverted trapezoid. As a result, the flow rate of the electrolyte can be slowed down when it flows from the third bottom wall 3372a to the third side wall 3372b.

[0127] The first protrusion 3341 abuts against the main body 121 of the collector plate. The orthogonal projection area of ​​the first protrusion 3341 on the collector plate 120 along the thickness direction W is greater than 1 / 3 of the cross-sectional area of ​​the collector plate 120 perpendicular to the thickness direction W.

[0128] exist Figure 6 In the embodiment shown, the first boss 3341 may surround a portion of the periphery of the second recess 3372, thereby making full use of the area on the insulating member 330.

[0129] When the cell assembly 100 moves along the extension direction L to abut against the insulator 330, the area of ​​the insulator 330 that abuts against the current collector 120 is large, making the stop of the insulator 330 against the cell assembly 100 more reliable.

[0130] This application also provides a battery cell, including the battery provided in this application.

[0131] This application also provides a battery module, including one or more batteries provided in this application; and / or, including one or more battery cells provided in this application.

[0132] This application also provides a battery pack, including one or more batteries provided in this application; and / or, including one or more battery cells provided in this application; and / or, including one or more battery modules provided in this application.

[0133] This application also provides an electrical device, including the battery provided in the above embodiments.

[0134] The electrical equipment can be battery-powered devices such as laptops, vehicles, aircraft, ferries, computers, or energy storage cabinets. Vehicles can be electric vehicles (EVs), pure electric vehicles (PEVs / BEVs), hybrid electric vehicles (HEVs), range-extended electric vehicles (REEVs), plug-in hybrid electric vehicles (PHEVs), or new energy vehicles.

[0135] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such 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. An insulating component, characterized in that, The insulating element (330) has opposing first surfaces (330a) and second surfaces (330b), one of which is arranged to face the cover plate (310); The insulating member (330) has a buffer area (330c), at least a portion of the buffer area (330c) is configured to be opposite to the explosion-proof valve (320) on the cover plate (310) in the thickness direction; In the buffer area (330c), a first blind hole (331) is provided on one side of the first surface (330a), and a second blind hole (332) is provided on one side of the second surface (330b). The orthographic projection of the first blind hole (331) along the thickness direction and the orthographic projection of the second blind hole (332) along the thickness direction are at least partially offset. The first blind hole (331) and the second blind hole (332) are in communication.

2. The insulating component according to claim 1, characterized in that, The orthographic projection of the first blind hole (331) along the thickness direction and the orthographic projection of the second blind hole (332) along the thickness direction at least partially overlap, and the orthographic projection of the first blind hole (331) along a first direction and the orthographic projection of the second blind hole (332) along the first direction at least partially overlap, so as to form a connecting channel (333) between the first blind hole (331) and the second blind hole (332); wherein, the first direction intersects the thickness direction; And / or, the second surface (330b) faces the cover plate (310), the insulating member (330) has a first boss (3341) that protrudes from the first surface (330a) in a direction away from the second surface (330b), the buffer area (330c) is located on the first boss (3341), and the first boss (3341) is used to abut against the cell assembly (100).

3. The insulating component according to claim 2, characterized in that, The insulating member (330) has a first recess (3342), which is recessed from the second surface (330b) in a direction toward the first surface (330a), and the first recess (3342) and the first boss (3341) are disposed opposite to each other in the thickness direction; And / or, the first boss (3341) is provided with a plurality of through holes (335) extending through the first boss (3341) along the thickness direction in the area other than the buffer area (330c).

4. The insulating component according to claim 3, characterized in that, The insulating member (330) has a flange (336) extending from the second surface (330b) in a direction away from the first surface (330a), the flange (336) having at least one notch (3361) communicating with the first recess (3342); And / or, the first boss (3341) of the insulating member (330) has a groove (3313) that is recessed from the first surface (330a) toward the second surface (330b), the groove (3313) communicating with at least a portion of the through hole (335), and / or, the groove (3313) communicating with a plurality of spaced-apart first blind holes (331).

5. The insulating member according to any one of claims 1 to 4, characterized in that, The insulating member (330) has a second boss (3371) that protrudes from the second surface (330b) in a direction away from the first surface (330a); the second boss (3371) is adapted to abut against the cover plate (310); And / or, the insulating member (330) has a second recess (3372) that is recessed from the first surface (330a) in a direction toward the second surface (330b), and the second recess (3372) and the second boss (3371) are disposed opposite to each other in the thickness direction.

6. A cover plate assembly, characterized in that, include: Cover plate (310); An explosion-proof valve (320) is disposed on the cover plate (310); The insulating member (330) as described in any one of claims 1 to 5, wherein the insulating member (330) is disposed on one side of the cover plate (310) and connected to the cover plate (310) along the thickness direction of the cover plate (310), and one of the first surface (330a) and the second surface (330b) of the insulating member (330) faces the cover plate (310); at least a portion of the buffer area (330c) of the insulating member (330) and the explosion-proof valve (320) are opposite each other along the thickness direction.

7. The cover plate assembly according to claim 6, characterized in that, The insulating component (330) includes a second boss (3371), one of the second boss (3371) and the cover plate (310) has a positioning post (3371a) and the other has a positioning groove (311), the positioning post (3371a) being inserted into the positioning groove (311); And / or, the cover plate assembly (300) further includes a pole post (400), the cover plate (310) has a first mounting hole (312), the insulator (330) has a second mounting hole (338), and the pole post (400) passes through the first mounting hole (312) and the second mounting hole (338) to connect the insulator (330) and the cover plate (310).

8. A battery, characterized in that, The device includes a cell assembly (100), a housing (200), and a cover assembly (300) as described in claim 6 or 7, wherein the housing (200) has a receiving cavity, and the end of the housing (200) along its extension direction has an opening communicating with the receiving cavity; the cell assembly (100) is located in the receiving cavity, the cover assembly (300) covers the end of the housing (200) and seals the opening, the insulating member (330) is located between the cover (310) and the cell assembly (100), and the housing (200) is filled with an electrolyte; wherein the extension direction of the housing (200) is consistent with the thickness direction.

9. The battery according to claim 8, characterized in that, The cover plate (310) is connected to the outer shell (200), and there is a gap between the insulating member (330) and the outer shell (200).

10. The battery according to claim 9, characterized in that, The battery cell assembly (100) includes a battery cell (110) and a current collector (120), wherein the battery cell (110) is electrically connected to the current collector (120); the current collector (120) is located between the insulating member (330) and the battery cell (110); the cover plate assembly (300) includes a terminal post (400), wherein the terminal post (400) is electrically connected to the current collector (120).

11. The battery according to claim 10, characterized in that, The collector plate (120) includes a collector plate body (121) and a bent portion (122); The insulating member (330) has a second recess (3372) that is recessed from the first surface (330a) in a direction toward the second surface (330b); at least a portion of the bent portion (122) is located in the second recess (3372).

12. The battery according to claim 11, characterized in that, Along the direction from the second surface (330b) to the first surface (330a), the sidewall of the second recess (3372) extends outward from the bottom wall of the second recess (3372).

13. The battery according to claim 11, characterized in that, The insulating member (330) has a first boss (3341) that protrudes from the first surface (330a) in a direction away from the second surface (330b). The first boss (3341) abuts against the main body (121) of the collector plate; the orthogonal projection area of ​​the first boss (3341) on the collector plate (120) along the thickness direction is greater than 1 / 3 of the cross-sectional area of ​​the collector plate (120) perpendicular to the thickness direction.

14. The battery according to any one of claims 8 to 13, characterized in that, There are two cover plate assemblies (300), and the two cover plate assemblies (300) are disposed on both ends of the housing (200) along the extension direction of the housing (200).

15. An electrical appliance, characterized in that, Includes the battery (10) as described in any one of claims 8 to 14.

Images