End cap assembly, energy storage device, and electric appliance

Abstract

This application provides an end cap assembly, an energy storage device, and an electrical device. The end cap assembly includes an insulator, an end cap, a terminal post, and a current collector. The insulator includes a plastic body, a first baffle, a second baffle, and a plurality of first baffles. The plastic body includes a first surface and a second surface disposed opposite each other along its thickness direction. The first baffle, the second baffle, and the plurality of first baffles are all connected to the first surface, forming a first flow channel between the first baffle and the second baffle. The plurality of first baffles are all located in the first flow channel, and the extension direction of each first baffle intersects the extension direction of the first baffle and the extension direction of the second baffle. The plurality of first baffles are spaced apart along the extension direction of the first flow channel. Each first baffle has a groove with a depth equal to the height of the first baffle, and the groove communicates with the first flow channel. The technical solution of this application can prevent debris inside the battery from flowing into the explosion-proof hole, thereby preventing the explosion-proof valve from failing.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to an end cap assembly, an energy storage device, and an electrical appliance. Background Technology

[0002] A rechargeable battery, also known as a secondary battery or accumulator, is a battery that can be recharged after discharge to reactivate its active materials and continue to be used. The recyclable nature of rechargeable batteries has made them a primary power source for electrical devices. As the demand for rechargeable batteries increases, so do the performance requirements, especially for energy density per unit volume. The volume of the wound electrode assembly is a crucial parameter for improving this energy density. If the wound electrode assembly is too small, there is less active electrode material, resulting in wasted internal space and lower energy density. Conversely, if the wound electrode assembly is too large, it hinders electrolyte wetting, preventing some active materials from functioning effectively. Therefore, a balance must be struck between the volume of the wound electrode assembly and the effectiveness of electrolyte wetting when designing the battery structure.

[0003] Existing secondary batteries, such as cylindrical lithium-ion batteries, consist of an end cap assembly, an electrode assembly, and a cylindrical casing. The actual manufacturing process involves separately fabricating the end cap assembly, electrode assembly, and cylindrical casing; then, metal adapters are used to weld the terminals of the end cap assembly and the tabs of the electrode assembly; the electrode assembly is then placed inside the cylindrical casing, and the metal adapters are bent to align the end cap assembly and the cylindrical casing concentrically; after the end cap assembly closes the opening of the cylindrical casing, it is welded to the opening to form a seal, thus forming the basic structure of the secondary battery. However, the metal adapters, after being bent at large angles, approach the metal fatigue limit and are highly susceptible to breakage due to vibration during use, causing the secondary battery to fail. Summary of the Invention

[0004] Embodiments of this application provide an end cap assembly, an energy storage device, and an electrical device that can prevent debris inside the battery from flowing into the explosion-proof hole, thereby preventing the explosion-proof valve from failing.

[0005] In a first aspect, this application provides an end cap assembly, comprising:

[0006] An insulating component, comprising a plastic body, a first baffle, a second baffle, and a plurality of first baffles, wherein the plastic body includes a first surface and a second surface disposed opposite to each other along the thickness direction, the first baffle, the second baffle, and the plurality of first baffles are all connected to the first surface, the first baffle is located on the side of the second baffle away from the center of the plastic body, the first baffle and the second baffle are spaced apart, a first flow channel is formed between the first baffle and the second baffle, the plurality of first baffles are all located in the first flow channel, the extension direction of each first baffle intersects the extension direction of the first baffle and the extension direction of the second baffle, the plurality of first baffles are spaced apart along the extension direction of the first flow channel, and the first baffle has a groove with a depth reaching the height of the first baffle, the groove communicating with the first flow channel;

[0007] An end cap, the end cap being located on one side of the second surface of the insulator;

[0008] The electrode post penetrates the center of the plastic body and the center of the end cap; and

[0009] A current collector is located on one side of the first surface of the insulating member. The current collector includes a first connecting portion, a second connecting portion, and a bending portion. The bending portion is connected between the first connecting portion and the second connecting portion. The first connecting portion and the second connecting portion are stacked. The side of the first connecting portion opposite to the second connecting portion is connected to the pole post.

[0010] Understandably, the first baffle, being connected between the first and second baffle bars, provides support for both bars. Furthermore, when the gas generated during operation flows within the first flow channel, it may carry fragments of the electrode tabs and the insulating film. The groove in the first baffle intercepts these fragments, preventing them from moving to the explosion-proof vent and blocking it, thus preventing gas from escaping and opening the explosion-proof valve.

[0011] In one possible implementation, in two adjacent first baffles, one of the grooves is offset from the other in the extending direction of the first baffle.

[0012] Understandably, the staggered arrangement of multiple grooves makes the gas flow path more meandering, and during the gas flow process, the debris carried by the gas is more easily blocked and intercepted by the first baffle.

[0013] In one possible implementation, the cross-sectional width of the groove gradually decreases along the direction from the first baffle toward the plastic body, and the cross-sectional width is the width of the groove in the extending direction of the first baffle in a cross section parallel to the first surface.

[0014] Understandably, the groove with a gradually decreasing cross-sectional width has a smaller width at the end near the plastic body. Therefore, the groove wall can further narrow the gas flow channel, thereby blocking smaller fragments. Furthermore, the side of the first baffle near the plastic body can provide sufficient support for the first and second baffles, preventing them from collapsing under external force and causing the first flow channel to fail.

[0015] In one possible implementation, the system further includes a connecting portion and a baffle portion. Both ends of the connecting portion are connected to the side of the first baffle away from the plastic body, and the two ends of the connecting portion are located on opposite sides of the groove. The baffle portion is connected to the side of the connecting portion facing the first baffle. The shape of the baffle portion is adapted to the shape of the groove, and at least a portion of the baffle portion is located within the groove.

[0016] It is understandable that the gap between the connecting part and the baffle part and the first baffle can allow gas to flow through, and the baffle part and the first baffle can block the passage of debris, thereby preventing debris from moving to the explosion-proof hole and thus preventing the explosion-proof valve from failing.

[0017] In one possible implementation, the connecting portion is arc-shaped and bends away from the plastic body. The connecting portion is capable of elastic deformation so that the baffle portion can abut against the groove wall.

[0018] Understandably, when the energy storage device is subjected to impact or vibration during use, the internal components may move back and forth relative to the insulating components. The internal components will approach the plastic body, and the first baffle can abut against the internal components, thus acting as a buffer between the plastic body and the internal components. The elasticity of the first baffle can apply a force to the internal components away from the plastic body, and the portion of the first baffle located within the groove can abut against the groove wall. This also applies a supporting force to the internal components away from the plastic body. Therefore, the first baffle plays a buffering role between the internal components and the plastic body of the energy storage device.

[0019] In one possible implementation, the projection of one end of the second stop bar onto the plastic body is at a first distance from the edge of the plastic body, and the projection of the other end of the second stop bar onto the plastic body is at a second distance from the edge of the plastic body.

[0020] Understandably, because the third end has a first distance from the edge of the plastic body, a gap exists between the third end and the housing after the end cap assembly is connected to the housing. This allows gas generated during the use of the energy storage device to flow out or into the housing through the gap between the third end and the housing. Because the fourth end has a second distance from the edge of the plastic body, a gap also exists between the fourth end and the housing after the end cap assembly is connected to the housing. Gas generated during the use of the energy storage device can flow out or into the housing through the gap between the fourth end and the housing, thus enabling the first flow channel to function.

[0021] In one possible implementation, the height range of the first stop bar and the height range of the second stop bar are between 3.5mm and 6.5mm.

[0022] It is understood that the first and second baffle sections are located between the plastic body and the electrode assembly. Due to the limited space between the plastic body and the electrode assembly, the height of the first and second baffle sections does not exceed 6.5 mm. Furthermore, if the first and second baffle sections are less than 3.5 mm, the resulting gas flow channel is too shallow to effectively guide the gas flow. Therefore, the height range of the first and second baffle sections provided in this application is between 3.5 mm and 6.5 mm.

[0023] In one possible implementation, the insulating component further includes a third baffle, a fourth baffle, and a plurality of second baffles. The third baffle, the fourth baffle, and the plurality of second baffles are all connected to the first surface. The third baffle is located on the side of the fourth baffle away from the center of the plastic body. The third baffle and the fourth baffle are spaced apart, forming a second flow channel between the third baffle and the fourth baffle. The plurality of second baffles are located in the second flow channel. The extending direction of each second baffle intersects the extending direction of the fourth baffle. The plurality of second baffles are spaced apart along the extending direction of the second flow channel. The second baffle has a groove with a depth reaching the height of the second baffle, and the groove communicates with the second flow channel.

[0024] In one possible implementation, the second baffle between the third and fourth baffles functions the same as the first baffle described above. The second flow channel provides another passage for the gas, and the second and first flow channels can work together to guide the gas flow, thereby synergistically preventing a large amount of gas from accumulating instantaneously at the explosion-proof hole, which could cause excessive local pressure and accidentally trigger the explosion-proof valve.

[0025] In one possible implementation, the fourth stop and the second stop are located on opposite sides of the center of the plastic body, with an intermediate region formed between the second stop and the fourth stop. The orthographic projection of the first connecting portion onto the plastic body is located in the intermediate region, and the orthographic projection of the second connecting portion onto the plastic body at least partially covers the second stop and the fourth stop.

[0026] Understandably, since the first, second, third, and fourth stop bars are located between the second connecting part and the plastic body, they ensure that there is always a certain gap between the first and second connecting parts. The size of this gap is at least the height of the first, second, third, and fourth stop bars. The second connecting part does not directly contact the first connecting part, thus preventing the bending angle of the bent part from being too large and avoiding the bent part reaching the metal fatigue limit. This, in turn, ensures that the current collector is less prone to breakage during use.

[0027] In one possible implementation, it further includes an explosion-proof hole and a third baffle portion. The explosion-proof hole penetrates the plastic body along the thickness direction of the plastic body and is located in the middle region. The height of the third baffle portion protruding from the first surface is lower than the height of the first baffle protruding from the first surface.

[0028] The third baffle is connected to the first surface, the third baffle is located in the middle region, and the third baffle is at least partially arranged around the explosion-proof hole.

[0029] Understandably, when excessive internal pressure in the energy storage device causes the electrode tabs or insulating membrane of the electrode assembly to break, the third baffle surrounding the anti-penetration hole can block the broken tabs or insulating membrane, allowing only airflow. This prevents the broken tabs or insulating membrane from blocking the explosion-proof hole and causing the explosion-proof valve to fail.

[0030] Secondly, this application also provides an energy storage device, including an electrode assembly and an end cap assembly as described above, wherein the second connection portion of the current collector is electrically connected to the electrode assembly.

[0031] Thirdly, this application also provides an electrical device, including the energy storage device described above, which is used to supply power to the electrical device. Attached Figure Description

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

[0033] Figure 1 This is a schematic diagram of the energy storage device provided in the embodiments of this application;

[0034] Figure 2 yes Figure 1 A schematic diagram of one structure of the end cap assembly of the energy storage device shown;

[0035] Figure 3 yes Figure 2 The exploded structural diagram of the end cap assembly shown;

[0036] Figure 4 yes Figure 3 The diagram shows the structure of the end cap;

[0037] Figure 5 yes Figure 2 A schematic diagram of one structure of the insulating component shown;

[0038] Figure 6 yes Figure 2 The diagram shows the structure of the current collector after bending.

[0039] Figure 7 yes Figure 2 The diagram shows a structural schematic of an end cap assembly;

[0040] Figure 8 yes Figure 5 A partial schematic diagram of the insulating component shown;

[0041] Figure 9 yes Figure 5 A schematic cross-sectional view of the AA side of the insulating component shown;

[0042] Figure 10 yes Figure 3 Another structural schematic diagram of the insulating component shown;

[0043] Figure 11 yes Figure 10 A cross-sectional schematic diagram of the BB side of the insulating component shown;

[0044] Figure 12 yes Figure 3 Another structural schematic diagram of the insulating component shown;

[0045] Figure 13 This is a partial cross-sectional schematic diagram of the insulating component, including the first baffle, in its first state.

[0046] Figure 14 This is a partial cross-sectional schematic diagram of the insulating component, including the first baffle, in the second state;

[0047] Figure 15 yes Figure 2The diagram shown illustrates the structure of the insulating component, including the third baffle section.

[0048] Reference numerals: Energy storage device 1000, housing 100, end cap assembly 200, end cap 210, explosion-proof valve 220, insulating component 230, current collector 240, pole post 250, upper plastic 260, voltage conductive block 270, explosion-proof valve through hole 211, first pole post through hole 212, plastic body 231, first baffle portion 232, second baffle portion 233, first surface 2311, second surface 2312, first edge region 2313, second edge region 2314, middle region 2315, explosion-proof hole 2316, second pole post through hole 2317, limiting protrusion 2318, first connecting portion 241, second connecting portion 242, bending portion 243, first baffle 2321, second baffle 232 2. First baffle 2323, first distance D1, second distance D2, first flow channel 2324, first end 2326, second end 2327, third end 2328, fourth end 2329, first side 2342, second side 2343, groove 2325, third distance D3, first baffle 281, connecting part 2811, baffle part 2812, third baffle 2331, fourth baffle 2332, second baffle 2333, second flow channel 2334, third baffle part 235, fifth baffle 2351, sixth baffle 2352, seventh baffle 2353, eighth baffle 2354, first flow channel opening 2340, second flow channel opening 2341, third flow channel 2355, fourth flow channel 2356. Detailed Implementation

[0049] For ease of understanding, the terminology used in the embodiments of this application will be explained first.

[0050] Multiple: refers to two or more.

[0051] Connection: should be interpreted broadly. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through an intermediary.

[0052] The specific embodiments of this application will now be clearly described in conjunction with the accompanying drawings.

[0053] This application provides an electrical device, which includes an energy storage device for providing power to the device. The electrical device may include vehicles, electronic devices, or drones. For example, electronic devices may include laptops, tablets, and mobile phones.

[0054] Please see Figure 1 , Figure 1 This is a schematic diagram of the energy storage device 1000 provided in an embodiment of this application. The Z-direction represents the height of the energy storage device 1000.

[0055] In the embodiments of this application, the energy storage device 1000 is exemplified by a cylindrical lithium-ion battery. The energy storage device 1000 includes a housing 100, an electrode assembly (not shown), and an end cap assembly 200. The housing 100 can be a cylindrical housing, with an opening at one end. The electrode assembly is installed inside the housing 100. Along the Z-axis direction, the end cap assembly 200 is connected to the opening of the housing 100 and is electrically connected to the electrode assembly.

[0056] The electrode assembly includes a positive electrode, a negative electrode, and a separator. The positive and negative electrode are spaced apart and disposed opposite to each other, and the separator is located between the positive and negative electrode. For example, the positive electrode, separator, and negative electrode are sequentially stacked and then wound to form the electrode assembly. The tab on the negative electrode is a negative electrode tab. The negative electrode is electrically connected to the end cap assembly 200 through the negative electrode tab.

[0057] Currently, the common practice is to add explosion-proof valves to energy storage devices so that when the internal pressure of the energy storage device becomes too high, the valves are forced open to create a pressure relief orifice. However, when the internal pressure of the energy storage device becomes too high, the internal components are prone to breakage, generating fragments that can block the pressure relief orifice, thus causing the explosion-proof valve to fail.

[0058] Based on this, embodiments of this application provide an energy storage device 1000 that can prevent internal components of the energy storage device 1000 from breaking and flowing into the explosion-proof hole, thereby preventing the explosion-proof valve from failing.

[0059] Please see Figure 2 and Figure 3 , Figure 2 yes Figure 1 A schematic diagram of the end cap assembly 200 of the energy storage device 1000 shown, wherein the current collector 240 is not bent. Figure 3 yes Figure 2 The exploded structural diagram of the end cap assembly 200 shown shows that the current collector 240 is not bent.

[0060] The end cap assembly 200 includes an end cap 210, an explosion-proof valve 220, an insulating component 230, a current collector 240, a terminal post 250, an upper plastic layer 260, and a voltage-conducting block 270. In the embodiments provided in this application, the end cap assembly 200 is a negative end cap assembly, the end cap 210 in the end cap assembly 200 is a negative end cap, the terminal post 250 in the end cap assembly 200 is a negative terminal post, and the current collector 240 in the end cap assembly 200 is a negative current collector.

[0061] It should be noted that, Figure 2The purpose is merely to illustratively describe the connection relationships of end cap 210, explosion-proof valve 220, insulating component 230, current collector 240, pole 250, upper plastic 260, and voltage conductive block 270, and is not to specifically limit the connection positions, specific structures, or quantities of each device. Furthermore, the structures illustrated in the embodiments of this application do not constitute a specific limitation on the end cap assembly 200. In other embodiments of this application, the end cap assembly 200 includes... Figure 2 This may involve more or fewer components, or combining certain components, or splitting certain components, or different component arrangements. Figure 2 The components shown can be implemented in hardware, software, or a combination of both.

[0062] Please see Figure 4 , Figure 4 yes Figure 3 The diagram shows the structure of the end cap 210. The end cap 210 can be made of conductive material. The end cap 210 includes an explosion-proof valve through hole 211 and a first pole through hole 212. The first pole through hole 212 can be located in the middle of the end cap 210. The explosion-proof valve through hole 211 and the first pole through hole 212 are spaced apart.

[0063] The explosion-proof valve 220 seals the explosion-proof valve through-hole 211. The explosion-proof valve 220 can partially or completely detach from the end cap 210 when the pressure inside the housing 100 becomes excessive. This creates a gas passage, rapidly reducing the gas pressure inside the housing 100 and thus preventing the energy storage device 1000 from exploding.

[0064] Please see Figure 5 , Figure 5 yes Figure 2 The diagram shows a structural schematic of the insulating member 230. The insulating member 230 includes a plastic body 231, a first baffle portion 232, and a second baffle portion 233. The plastic body 231 can be circular. The plastic body 231 includes a first surface 2311 and a second surface 2312 disposed opposite to each other along the thickness direction. The first surface 2311 includes a first edge region 2313, a second edge region 2314, and a middle region 2315. The first edge region 2313 and the second edge region 2314 are located on opposite sides of the middle region 2315.

[0065] A first stop bar portion 232 and a second stop bar portion 233 are disposed on a first surface 2311. The first stop bar portion 232 is located in a first edge region 2313. The second stop bar portion 233 is located in a second edge region 2314. An intermediate region 2315 is formed between the first stop bar portion 232 and the second stop bar portion 233. For example, the height of the first stop bar portion 232 and the height of the second stop bar portion 233 are X, where 3.5mm ≤ X ≤ 6.5mm. The height of the first stop bar portion 232 and the second stop bar portion 233 is the distance they extend from the first surface 2311 in a direction away from the first surface 2311.

[0066] The plastic body 231 also has an explosion-proof hole 2316 and a second pole post through hole 2317. Both the explosion-proof hole 2316 and the second pole post through hole 2317 penetrate the first surface 2311 and the second surface 2312, and are both located in the intermediate region 2315. The second pole post through hole 2317 is located at the center of the plastic body 231. The explosion-proof hole 2316 and the second pole post through hole 2317 are spaced apart. For example, the explosion-proof hole 2316 and the second pole post through hole 2317 can be spaced apart in the extending direction of the first stop bar portion 232 and the second stop bar portion 233. The explosion-proof hole 2316 of the plastic body 231 communicates with the explosion-proof valve through hole 211 of the end cap 210, and the second pole post through hole 2317 of the plastic body 231 communicates with the first pole post through hole 212 of the end cap 210.

[0067] The insulating component 230 also includes a limiting protrusion 2318, which is connected to the first surface 2311 of the plastic body 231 and is located in the middle region 2315. The limiting protrusion 2318 is used to abut against the current collector 240.

[0068] Understandably, the limiting protrusion 2318 can limit the current collector 240. Thus, when the energy storage device 1000 is subjected to external impact or vibration during use, the relative displacement between the current collector 240 and the insulating component 230 is reduced, thereby preventing the current collector 240 from falling off the insulating component 230 due to insufficient connection strength.

[0069] Please refer to the following: Figure 6 and Figure 7 , Figure 6 yes Figure 2 The diagram shows the structure of the current collector 240 after bending. Figure 7 yes Figure 2 The diagram shows a structural schematic of an end cap assembly 200, wherein the manifold 240 is not bent. The manifold 240 includes a first connecting portion 241, a second connecting portion 242, and a bent portion 243. The bent portion 243 connects between the first connecting portion 241 and the second connecting portion 242. Figure 7In the unbent state shown, the manifold 240 is not connected to the housing 100, and the manifold 240 extends straight. The first connecting portion 241, the bent portion 243, and the second connecting portion 242 are connected sequentially. To accommodate the internal space of the housing 100, the manifold 240 needs to be bent when installed in the housing 100. Figure 6 In the bent state, the current collector 240 shown has a first connecting portion 241 and a second connecting portion 242 stacked and spaced apart. The first connecting portion 241 is connected to the first surface 2311 of the plastic body 231, and is located in the middle region 2315. The orthographic projection of the second connecting portion 242 on the plastic body 231 at least partially covers the first baffle portion 232 and the second baffle portion 233. The second connecting portion 242 is used to connect to the negative electrode tab of the electrode assembly.

[0070] Understandably, when the energy storage device 1000 is subjected to external impact or vibration during use, the electrode assembly may move back and forth relative to the end cap assembly 200. This movement of the electrode assembly will cause the second connecting portion 242 of the current collector 240 to move, resulting in repeated bending of the bent portion 243. Since the first stop bar portion 232 and the second stop bar portion 233 are located between the second connecting portion 242 and the plastic body 231, they ensure that there is always a certain gap between the first connecting portion 241 and the second connecting portion 242. This gap prevents the second connecting portion 242 from directly contacting the first connecting portion 241, thus preventing the bending angle of the bent portion 243 from becoming too large and avoiding the bent portion 243 reaching its metal fatigue limit. This, in turn, ensures that the current collector 240 is less prone to breakage during use, preventing the energy storage device 1000 from failing. For example, the size of the gap between the first connecting portion 241 and the second connecting portion 242 can be at least the height of the first stop portion 232 and the second stop portion 233.

[0071] Please refer to the following: Figure 7 and Figure 8 , Figure 8 yes Figure 5 A partial schematic diagram of the insulating member 230 is shown. The first baffle portion 232 may include a first baffle 2321, a second baffle 2322, and a first baffle 2323. The first baffle 2321, the second baffle 2322, and the first baffle 2323 are all connected to the first surface 2311. The first baffle 2321 is located away from the center of the plastic body 231 relative to the second baffle 2322. The first baffle 2323 is located between the first baffle 2321 and the second baffle 2322.

[0072] Specifically, a first baffle 2321 is disposed on a first surface 2311 along the circumference of the plastic body 231. A second baffle 2322 extends along the first surface 2311 and has a gap with the first baffle 2321. The projection of one end of the second baffle 2322 onto the plastic body 231 has a first distance D1 with the edge of the plastic body 231, and the projection of the other end of the second baffle 2322 onto the plastic body 231 has a second distance D2 with the edge of the plastic body 231. The first distance D1 and the second distance D2 can be the same or different. The first distance D1 and the second distance D2 can be between 0.5mm and 1.5mm (inclusive of the endpoint values ​​of 0.5mm and 1.5mm). The gap region between the first baffle 2321 and the second baffle 2322 forms a first flow channel 2324. For example, the height of the first baffle portion 232 and the height of the second baffle portion 233 are X, where 3.5mm ≤ X ≤ 6.5mm. The height of the first stop bar portion 232 and the second stop bar portion 233 is the distance that extends from the first surface 2311 in a direction away from the first surface 2311.

[0073] It is understandable that the first baffle portion 232 and the second baffle portion 233 are located between the plastic body 231 and the electrode assembly, etc. Due to the limited space between the plastic body 231 and the electrode assembly, the height of the first baffle portion 232 and the second baffle portion 233 does not exceed 6.5 mm. However, when the first baffle portion 232 and the second baffle portion 233 are less than 3.5 mm, the formed gas flow channel is too shallow to effectively guide the gas flow. Therefore, the height range of the first baffle portion 232 and the second baffle portion 233 provided in this application is between 3.5 mm and 6.5 mm.

[0074] Please see Figure 8 The first baffle 2321 includes a first end 2326 and a second end 2327 disposed opposite to each other, and the second baffle 2322 includes a third end 2328 and a fourth end 2329 disposed opposite to each other. The first end 2326 and the third end 2328 are disposed on the same side, and a first flow channel opening 2340 of a first flow channel 2324 is formed between the first end 2326 and the third end 2328. The second end 2327 and the fourth end 2329 are disposed on the same side, and a second flow channel opening 2341 of the first flow channel 2324 is formed between the second end 2327 and the fourth end 2329. The projection of the third end 2328 on the plastic body 231 has a first distance D1 with the edge of the plastic body 231, and the projection of the fourth end 2329 on the plastic body 231 has a second distance D2 with the edge of the plastic body 231.

[0075] Understandably, because the third end 2328 has a first distance D1 from the edge of the plastic body 231, a gap exists between the third end 2328 and the housing 100 after the end cap assembly 200 is connected to the housing 100. This allows the gas generated by the energy storage device 1000 during use to flow out or into the housing through the gap. Because the fourth end 2329 has a second distance D2 from the edge of the plastic body 231, a gap exists between the fourth end 2329 and the housing 100 after the end cap assembly 200 is connected to the housing 100. The gas generated by the energy storage device 1000 during use can flow out or into the housing through the gap, thus enabling the first flow channel 2324 to function.

[0076] In one possible application scenario, the gas generated during the use of the energy storage device 1000 can first flow in through the gap between the third end 2328 and the housing 100, and enter the first flow channel 2324 through the first flow port 2340. Then the gas can flow out through the second flow port 2341, and flow out through the gap between the fourth end 2329 and the housing 100. The outflowing gas can then flow to the location of the explosion-proof hole 2316. When the internal pressure of the energy storage device 1000 is too high, the explosion-proof valve 220 will be opened by the internal gas pressure of the energy storage device 1000, and the gas can pass through the explosion-proof hole 2316 on the plastic body 231 and the explosion-proof valve through hole 211 on the end cap 210 in sequence, thereby completing the pressure relief.

[0077] A first baffle 2323 is located in a first flow channel 2324. One side of the first baffle 2323 can be connected to the surface of the first baffle 2321 facing the second baffle 2322. The other side of the first baffle 2323 can be connected to the surface of the second baffle 2322 facing the first baffle 2321. The extending direction of the first baffle 2323 intersects the extending directions of the first baffle 2321 and the second baffle 2322. For example, the extending direction of the first baffle 2323 can be perpendicular to the extending direction of the second baffle 2322. The extending direction of the first baffle 2323 can intersect the extending direction of the first flow channel 2324. The extending direction of the first baffle 2323 is the direction from the first baffle 2321 towards the second baffle 2322. The first baffles 2323 can be spaced apart along the extending direction of the first flow channel 2324.

[0078] Please see Figure 9 , Figure 9 yes Figure 5The diagram shows a cross-sectional view of the AA side of the insulating component. The first baffle 2323 includes a first side 2342 and a second side 2343 disposed opposite to each other. The first side 2342 is the side of the first baffle 2323 connected to the plastic body 231. The second side 2343 is the side of the first baffle 2323 away from the plastic body 231. The first baffle 2323 has a groove 2325 with a depth reaching the height of the first baffle 2323, and the groove 2325 communicates with the first flow channel 2324. The groove 2325 penetrates the first baffle 2323 along its thickness direction. The groove 2325 is recessed from the second side 2343 of the first baffle 2323 towards the first side 2342. The recess depth of the groove 2325 is the same as the height of the first baffle 2323. Along the direction from the first baffle 2323 toward the plastic body 231, the cross-sectional width of the groove 2325 gradually decreases. The cross-sectional width refers to the width of the groove 2325 in the extension direction of the first baffle 2323 in the cross-section parallel to the first surface 2311.

[0079] Understandably, since the first baffle 2323 is connected between the first baffle 2321 and the second baffle 2322, it can provide support for both baffles. Additionally, when the gas flows within the first flow channel 2324, it may carry fragments of the tabs and the insulating film. The groove 2325 of the first baffle 2323 can intercept these fragments, allowing only gas to pass through, preventing them from moving to the explosion-proof hole 2316 and blocking it, thus preventing gas from overflowing and opening the explosion-proof valve 220.

[0080] For the first possible implementation, please refer to Figure 10 , Figure 10 yes Figure 3 The diagram shows another structural schematic of the insulating member 230. In the extending directions of the first baffle 2321 and the second baffle 2322, the cross-sectional width of the first baffle 2321 can gradually decrease from its middle portion towards both ends. The cross-sectional width of the second baffle 2322 remains constant along its extending direction. The distance between the first baffle 2321 and the second baffle 2322 is the same, and the lengths of the first baffle 2321 and the second baffle 2322 can be the same. That is, the width of the first flow channel 2324 along its extending direction is always the same.

[0081] In this embodiment, there can be multiple first baffles 2323, and these multiple first baffles 2323 are located in the first flow channel 2324. The multiple first baffles 2323 can be evenly spaced along the extending direction of the first flow channel 2324. Please refer to [link / reference]. Figure 11 , Figure 11 yes Figure 10The diagram shows a cross-sectional view of the BB side of the insulating component. The cross-sectional shape of the groove 2325 can be U-shaped. Furthermore, there is a third distance D3 between the bottom wall of the groove 2325 and the first surface 2311 of the plastic body 231.

[0082] Understandably, the groove 2325 can narrow the gas flow channel, so that the fragments flowing with the gas can be blocked by the first baffle 2323, preventing them from passing through the first flow channel 2324 and reaching the explosion-proof hole 2316.

[0083] For the second possible implementation, please refer to [link / reference]. Figure 8 The same content as in the first possible implementation will not be repeated. The difference is that, in the extending directions of the first baffle 2321 and the second baffle 2322, the cross-sectional width of the first baffle 2321 along its extending direction can remain constant. The cross-sectional width of the second baffle 2322 along its extending direction can also remain constant. In the extending direction of the first flow channel 2324, the distance between the first baffle 2321 and the second baffle 2322 gradually narrows from the middle to both ends. That is, the cross-sectional width of the first flow channel 2324 gradually narrows from the middle to both ends. The length of the first baffle 2321 is greater than the length of the second baffle 2322.

[0084] In this embodiment, there can be multiple first baffles 2323, and these multiple first baffles 2323 are located in the first flow channel 2324. The multiple first baffles 2323 can be evenly spaced along the extending direction of the first flow channel 2324. Please refer to [link / reference]. Figure 12 , Figure 12 yes Figure 3 The diagram shows another structural embodiment of the insulating element 230. The cross-sectional shape of the groove 2325 can be V-shaped. In two adjacent first baffles 2323, one groove 2325 is offset from the other groove 2325. The orthographic projection of the groove 2325 of one first baffle 2323 onto the adjacent first baffle 2323 at least partially covers the groove 2325 of the adjacent first baffle 2323.

[0085] Understandably, the V-shaped groove 2325 has a smaller width at the end near the plastic body 231, thus the groove wall of the groove 2325 can further narrow the gas flow channel, thereby blocking smaller fragments. Furthermore, the side of the first baffle 2323 near the plastic body 231 can provide sufficient support for the first baffle 2321 and the second baffle 2322, preventing them from collapsing under external force. Additionally, the staggered arrangement of multiple grooves 2325 makes the gas flow channel more meandering, and during gas flow, fragments carried by the gas are more easily blocked by the first baffle 2323. Moreover, the projection of the groove 2325 of one first baffle 2323 onto an adjacent first baffle 2323 at least partially covers the groove 2325 of that adjacent first baffle 2323, allowing gas to pass relatively smoothly through multiple first baffles 2323 sequentially, preventing gas from being blocked by the first baffles 2323 and thus preventing gas flow obstruction.

[0086] In the third possible implementation, please refer to Figure 13 , Figure 13 This is a partial cross-sectional view of the insulating member 230, including the first baffle 281, in its first state. The same content as in the first possible embodiment will not be repeated. However, unlike the first embodiment, the insulating member 230 may further include the first baffle 281, with both ends of the first baffle 281 connected to the first baffle 2323, and at least a portion of the first baffle 281 located within the groove 2325. Specifically, the first baffle 281 includes a connecting portion 2811 and a baffle portion 2812. The connecting portion 2811 is arc-shaped. Both ends of the connecting portion 2811 are connected to the second side 2343 of the first baffle 2323, and the two ends of the connecting portion 2811 are located on opposite sides of the groove 2325. The arc-shaped connecting portion 2811 bends away from the plastic body 231. The baffle portion 2812 is connected to the side of the connecting portion 2811 facing the first baffle 2323, and the shape of the baffle portion 2812 is adapted to the shape of the groove 2325. At least part of the baffle portion 2812 is located within the groove 2325.

[0087] Please refer to the following: Figure 13 and Figure 14 , Figure 14 This is a partial cross-sectional view of the insulating member 230, including the first baffle 281, in its second state. The insulating member 230 includes a first state and a second state. In the first state, the insulating member 230 is not subjected to external impact or abnormal vibration. The connecting portion 2811 does not undergo elastic deformation, a portion of the first baffle 281 is located within the groove 2325, and a gap exists between the first baffle 281 and the groove 2325.

[0088] It is understandable that the gap between the first baffle 281 and the first baffle 2323 allows gas to flow through, and the first baffle 281 and the first baffle 2323 can block the passage of debris, thereby preventing the debris from moving to the explosion-proof hole 2316 and thus preventing the explosion-proof valve 220 from failing.

[0089] When the insulating component 230 is in the second state, the energy storage device 1000 may be subjected to external impact or abnormal vibration. When the second connecting part 242 is subjected to external force, the second connecting part 242 will move towards the insulating component 230, thereby abutting against the side of the connecting part 2811 away from the baffle part 2812, and pushing the connecting part 2811 towards the insulating component 230. Since the connecting part 2811 is a curved arc, the arc-shaped arms protruding on both sides of the connecting part 2811 relative to the baffle part 2812 can bend and deform to absorb energy, thereby playing a buffering role. At the same time, the connecting part 2811 will push the baffle part 2812 towards the first surface 2311, thereby causing the baffle part 2812 to abut against the groove wall of the groove 2325, thereby sealing the groove 2325, limiting the passage of electrolyte, and preventing the electrolyte from impacting the explosion-proof valve 220 and causing false triggering.

[0090] Understandably, when the energy storage device 1000 is subjected to impact or vibration during use, the electrode assembly may move back and forth relative to the end cap assembly 200. The electrode assembly causes the second connecting portion 2811 to move closer to the plastic body 231. The middle position of the connecting portion 2811 of the first baffle 281 can abut against the second connecting portion 2811, thus providing a buffering effect between the plastic body 231 and the second connecting portion 2811. The elasticity of the connecting portion 2811 can apply a force to the second connecting portion 242 away from the plastic body 231, and the baffle portion 2812 can abut against the groove wall of the groove 2325. The baffle portion 2812 can indirectly contact the second connecting portion 2811 through the connecting portion 2811, thereby also applying a supporting force to the second connecting portion 2811 away from the plastic body 231. The first baffle 281 can apply a buffering force to the second connection portion 242 of the current collector 240 and the motor assembly connected to the second connection portion 242. Therefore, the external force on the electrode assembly connected to the second connection portion 242 will also be indirectly removed, thereby preventing the negative electrode tab of the electrode assembly from being deformed by excessive external force, and thus preventing the negative electrode tab from contacting the positive electrode plate of the electrode assembly after deformation, which would cause a short circuit in the energy storage device 1000 and cause an explosion.

[0091] Please refer to the following: Figure 7The second baffle section 233 includes a third baffle 2331, a fourth baffle 2332, and a second baffle 2333. The third baffle 2331, the fourth baffle 2332, and the second baffle 2333 are all connected to the first surface 2311. The third baffle 2331 is located on the side of the fourth baffle 2332 opposite to the center of the plastic body 231. A second flow channel 2334 is formed between the third baffle 2331 and the fourth baffle 2332. The second baffle 2333 is located in the second flow channel 2334, and the extending direction of the second baffle 2333 intersects the extending direction of the fourth baffle 2332.

[0092] The second stop bar 233 can be configured in the same way as the first stop bar 232. Specifically, the third stop bar 2331 can be symmetrically arranged with respect to the centerline of the plastic body 231 relative to the first stop bar 2321. The fourth stop bar 2332 can be symmetrically arranged with respect to the centerline of the plastic body 231 relative to the second stop bar 2322. The second baffle can be arranged with respect to the centerline of the plastic body 231 relative to the first baffle 2323. The structure and configuration of the third stop bar 2331 can be found in the description of the first stop bar 2321 above. The structure and configuration of the fourth stop bar 2332 can be found in the description of the second stop bar 2322 above. The second baffle 2333 can be provided with a groove 2325, and the configuration of the groove 2325 of the second baffle 2333 can be the same as the configuration of the groove 2325 of the first baffle 2323. The structure and arrangement of the second baffle 2333 can be found in the description of the first baffle 2323 above. The insulating member 230 may also include a second baffle plate (not shown in the figure), which can be connected to the second baffle 2333. The specific structure and arrangement of the second baffle plate can be found in the description of the first baffle plate 281 above. This application will not elaborate on the second baffle bar 233.

[0093] For the fourth possible implementation, please refer to Figure 15 , Figure 15 yes Figure 2The schematic diagram shown illustrates the structure of the insulating member 230, including a third baffle portion 235. The same content as in the first possible embodiment will not be repeated. However, unlike the first embodiment, the insulating member 230 further includes a third baffle portion 235. The third baffle portion 235 is connected to the first surface 2311 and is located in the intermediate region 2315. The third baffle portion 235 is at least partially disposed around the explosion-proof hole 2316. The extending direction of the third baffle portion 235 intersects the extending direction of the first baffle portion 232 and the second baffle portion 233. Exemplarily, the extending direction of the third baffle portion 235 is either a straight line or a curve. The height of the third baffle portion 235 ranges from 1.2 mm to 2.5 mm. The height of the third baffle portion 235 is the distance by which it extends away from the first surface 2311. The height of the third baffle portion 235 protruding from the first surface 2311 is lower than the height of the first baffle 2321 protruding from the first surface 2311.

[0094] Understandably, when excessive internal air pressure in the energy storage device 1000 causes the electrode tabs or insulating film of the electrode assembly to break, the third baffle 235 surrounding the anti-through hole can block the broken electrode tabs or insulating film, allowing only airflow to pass through. This prevents the broken electrode tabs or insulating film from blocking the explosion-proof hole 2316, thus avoiding the failure of the explosion-proof valve 220.

[0095] Furthermore, the third baffle 235 is located between the first connecting portion 241 and the plastic body 231 of the collector 240. If the height of the third baffle 235 is too low, it will not be able to intercept debris. If the height of the third baffle 235 is too high, the distance between the first connecting portion 241 and the plastic body 231 will be too large, affecting the connection stability between the first connecting portion 241 and the plastic body 231.

[0096] Specifically, the third baffle portion 235 may include a fifth baffle 2351, a sixth baffle 2352, a seventh baffle 2353, and an eighth baffle 2354. The fifth baffle 2351 may be located between the explosion-proof hole 2316 and the first baffle portion 232. The sixth baffle 2352 is located between the explosion-proof hole 2316 and the second baffle portion 233. The seventh baffle 2353 and the eighth baffle 2354 are both located on the side of the explosion-proof hole 2316 facing the center of the plastic body 231. The eighth baffle 2354 is located on the side of the seventh baffle 2353 facing away from the explosion-proof hole 2316. A third flow channel 2355 is formed between the fifth baffle 2351 and the seventh baffle 2353. A fourth flow channel 2356 is formed between the sixth baffle 2352 and the seventh baffle 2353.

[0097] It is understandable that by placing the fifth baffle 2351 on one side of the explosion-proof hole 2316 and forming a third flow channel 2355 with the seventh baffle 2353, gas from the side of the explosion-proof hole 2316 facing the first baffle portion 232 can pass through the third flow channel 2355. By placing the sixth baffle 2352 on the other side of the explosion-proof hole 2316 and forming a fourth flow channel 2356 with the seventh baffle 2353, gas from the side of the explosion-proof hole 2316 facing the second baffle portion 233 can pass through the fourth flow channel 2356. In other words, by sequentially arranging the fifth baffle 2351, the seventh baffle 2353, and the sixth baffle 2352 around the explosion-proof hole 2316, the fifth baffle 2351, the seventh baffle 2353, and the sixth baffle 2352 can cooperate to surround the explosion-proof hole 2316, thereby integrating the airflow around the explosion-proof hole 2316. In addition, since the third flow channel 2355 and the fourth flow channel 2356 are relatively narrow and long, they can prevent broken electrode tabs or insulating sheets from being easily blocked by the fifth baffle 2351, the sixth baffle 2352, and the seventh baffle 2353 in the aforementioned flow channels when they splash. This prevents broken electrode tabs or insulating sheets from passing through the explosion-proof hole 2316 towards the second electrode through hole 2317, which helps to prevent the explosion-proof hole 2316 from being blocked by foreign objects and causing the explosion-proof valve 220 to fail.

[0098] Please refer to the following: Figure 2 and Figure 3 The electrode post 250 is sequentially inserted through the first connecting portion 241 of the current collector 240, the second electrode post through hole 2317 of the insulating member 230, and the first electrode post through hole 212 of the end cap 210, and protrudes relative to the end cap 210. Specifically, the electrode post 250 can pass through the center of the end cap 210. The electrode post 250 is spaced apart from the explosion-proof valve 220.

[0099] The upper plastic 260 is installed between the end cap 210 and the pole post 250, and is located on the side of the end cap 210 facing away from the insulator 230. The upper plastic 260 can insulate and isolate the end cap 210 and the pole post 250, and the upper plastic 260 can have a cavity.

[0100] The conductive block is located on the side of the end cap 210 opposite to the insulating member 230. The voltage-conducting block 270 is sleeved on the peripheral side of the pole post 250 to press and fix the pole post 250. The voltage-conducting block 270 can be located inside the cavity of the upper plastic 260. The peripheral surface of the voltage-conducting block 270 can abut against the wall of the cavity of the upper plastic 260.

[0101] When assembling the energy storage device 1000, the second connecting portion 242 of the current collector 240 in the end cap assembly 200 is welded and fixed to the negative electrode tab in the electrode assembly to achieve electrical connection between the end cap assembly 200 and the electrode assembly. The assembled electrode assembly is placed inside the housing 100. The end cap 210 in the end cap assembly 200 covers the opening of the housing 100, the insulating member 230 is also located inside the housing 100, and the end cap 210 is welded and sealed to the housing 100 to assemble and form the energy storage device 1000.

[0102] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An end cap assembly (200), characterized in that, include: An insulating component (230) includes a plastic body (231), a first baffle (2321), a second baffle (2322), and a plurality of first baffles (2323). The plastic body (231) includes a first surface (2311) and a second surface (2312) disposed opposite to each other along the thickness direction. The first baffle (2321), the second baffle (2322), and the plurality of first baffles (2323) are all connected to the first surface (2311). The first baffle (2321) is located on the side of the second baffle (2322) away from the center of the plastic body (231). The first baffle (2321) and the second baffle (2322) are... The first baffle (2321) and the second baffle (2322) are spaced apart to form a first flow channel (2324). A plurality of first baffles (2323) are located in the first flow channel (2324). The extension direction of each first baffle (2323) intersects the extension direction of the first baffle (2321) and the extension direction of the second baffle (2322). The plurality of first baffles (2323) are spaced apart along the extension direction of the first flow channel (2324). The first baffle (2323) is provided with a groove (2325) with a depth reaching the height of the first baffle (2323). The groove (2325) communicates with the first flow channel (2324). End cap (210), said end cap (210) being located on one side of the second surface (2312) of said insulator (230); A terminal post (250) passing through the center of the plastic body (231) and the center of the end cap (210); and The current collector (240) is located on one side of the first surface (2311) of the insulating member (230). The current collector (240) includes a first connecting part (241), a second connecting part (242) and a bending part (243). The bending part (243) is connected between the first connecting part (241) and the second connecting part (242). The first connecting part (241) and the second connecting part (242) are stacked. The side of the first connecting part (241) away from the second connecting part (242) is connected to the pole post (250).

2. The end cap assembly (200) according to claim 1, characterized in that, In two adjacent first baffles (2323), one of the grooves (2325) and the other groove (2325) are offset in the extending direction of the first baffle (2323).

3. The end cap assembly (200) according to claim 1 or 2, characterized in that, Along the direction from the first baffle (2323) toward the plastic body (231), the cross-sectional width of the groove (2325) gradually decreases. The cross-sectional width is the width of the groove (2325) in the extending direction of the first baffle (2323) in a cross-section parallel to the first surface (2311).

4. The end cap assembly (200) according to claim 3, characterized in that, It also includes a connecting part (2811) and a baffle part (2812). Both ends of the connecting part (2811) are connected to the side of the first baffle (2323) away from the plastic body (231), and the two ends of the connecting part (2811) are respectively located on opposite sides of the groove 2325. The baffle part (2812) is connected to the side of the connecting part (2811) facing the first baffle (2323). The shape of the baffle part (2812) is adapted to the shape of the groove (2325), and at least part of the baffle part (2812) is located in the groove (2325).

5. The end cap assembly (200) according to claim 4, characterized in that, The connecting part (2811) is arc-shaped and bends away from the plastic body (231). The connecting part (2811) can undergo elastic deformation so that the baffle part (2812) can abut against the groove wall of the groove (2325).

6. The end cap assembly (200) according to claim 1, characterized in that, The projection of one end of the second stop bar (2322) onto the plastic body (231) has a first distance (D1) from the edge of the plastic body (231), and the projection of the other end of the second stop bar (2322) onto the plastic body (231) has a second distance (D2) from the edge of the plastic body (231).

7. The end cap assembly (200) according to claim 1, characterized in that, The insulating component (230) further includes a third baffle (2331), a fourth baffle (2332), and a plurality of second baffles (2333). The third baffle (2331), the fourth baffle (2332), and the plurality of second baffles (2333) are all connected to the first surface (2311). The third baffle (2331) is located on the side of the fourth baffle (2332) away from the center of the plastic body (231). The third baffle (2331) and the fourth baffle (2332) are spaced apart. The third baffle (2331) and the fourth baffle (2332) are connected to the first surface (2311). A second flow channel (2334) is formed between the four baffles (2332), and a plurality of second baffles (2333) are located in the second flow channel (2334). The extension direction of each second baffle (2333) intersects the extension direction of the fourth baffle (2332). The plurality of second baffles (2333) are spaced apart along the extension direction of the second flow channel (2334). The second baffle (2333) is provided with a groove (2325) with a depth reaching the height of the second baffle (2333). The groove (2325) communicates with the second flow channel (2334).

8. The end cap assembly (200) according to claim 7, characterized in that, The fourth stop bar (2332) and the second stop bar (2322) are located on opposite sides of the center of the plastic body (231), and an intermediate region (2315) is formed between the second stop bar (2322) and the fourth stop bar (2332). The orthographic projection of the first connecting part (241) onto the plastic body (231) is located in the intermediate region (2315), and the orthographic projection of the second connecting part (242) onto the plastic body (231) at least partially covers the second stop bar (2322) and the fourth stop bar (2332).

9. The end cap assembly (200) according to claim 8, characterized in that, It also includes an explosion-proof hole (2316) and a third baffle (235). The explosion-proof hole (2316) penetrates the plastic body (231) along the thickness direction of the plastic body (231). The explosion-proof hole (2316) is located in the middle region (2315). The height of the third baffle (235) protruding from the first surface (2311) is lower than the height of the first baffle (2321) protruding from the first surface (2311). The third baffle (235) is connected to the first surface (2311), the third baffle (235) is located in the middle region (2315), and the third baffle (235) is at least partially arranged around the explosion-proof hole (2316).

10. An energy storage device (1000), characterized in that, Includes an electrode assembly and an end cap assembly (200) as described in any one of claims 1-9, wherein the second connection portion (242) of the current collector (240) is electrically connected to the electrode assembly.

11. An electrical appliance, characterized in that, Includes the energy storage device (1000) as described in claim 10, the energy storage device (1000) being used to supply power to the electrical equipment.

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