A leak-proof wound electrode assembly for nickel-metal hydride batteries

Abstract

This invention discloses a leak-proof wound electrode assembly for nickel-metal hydride batteries, relating to the field of nickel-metal hydride battery technology. It includes a housing and electrode sheets disposed inside the housing. A fixing assembly is installed inside the housing, and a sealing cover is fixed to the upper surface of the housing via the fixing assembly. An mounting assembly is installed on the surface of the sealing cover, and a partition plate is fixed to the lower surface of the sealing cover. There are two sets of partition plates, one for the top and one for the bottom of the electrode sheets. The surface of the partition plates has corresponding partition grooves, and the electrode sheets are snapped into the partition grooves. This leak-proof wound electrode assembly for nickel-metal hydride batteries, by using partition plates and having multiple partition grooves on their surfaces with equal spacing between adjacent grooves, and by snapping the electrode sheets into the partition grooves, leaves a certain gap between adjacent electrode sheets, reducing angular deformation and stress accumulation caused by expansion, effectively reducing the risk of lithium plating and breakage, and thus lowering the possibility of leakage.

Description

Technical Field

[0001] This utility model relates to a wound electrode assembly, specifically a leak-proof wound electrode assembly for nickel-metal hydride batteries, belonging to the field of nickel-metal hydride battery technology. Background Technology

[0002] With the continuous development of the new energy industry, especially the electric vehicle industry, the requirements for power batteries, which are the core components of electric vehicles, are becoming increasingly stringent, particularly regarding safety and specific capacity. For power batteries, capacity, safety, and cost have become the mainstream directions for research and development within the industry. Current battery module structures include wound, stacked, pouch-type, and stack-folded structures. Among these, the wound structure involves winding continuous positive and negative electrode sheets separated by a separator.

[0003] The current winding electrode assembly has too close a mounting distance. During the charging and discharging of the battery cell, the electrode assembly expands, causing deformation at the corners and leading to lithium plating. In severe cases, this can result in damage at the corners and leakage. Although the above problems can be alleviated by introducing gaps into the winding battery cell through separator surface coating technology or electrode surface embossing, the gaps introduced by separator surface coating technology are limited, generally less than 5μm, and the coating quality control is difficult, which significantly increases the manufacturing cost of the separator. The electrode embossing solution is difficult to process, requires the development of specific embossing devices, and embossing significantly reduces the electrode strength, thereby increasing the risk of electrode breakage.

[0004] Therefore, a leak-proof wound electrode assembly for nickel-metal hydride batteries is proposed here. Utility Model Content

[0005] This invention proposes a leak-proof wound electrode assembly for nickel-metal hydride batteries to solve the problem in the prior art where adjacent electrodes are installed too close together, causing the electrode assembly to expand during cell charging and discharging, resulting in deformation at the corners of the electrode assembly, leading to lithium plating, and in severe cases, damage at the corners of the electrode assembly and leakage.

[0006] This utility model is achieved through the following technical solution: a leak-proof spiral-wound electrode assembly for nickel-metal hydride batteries, including a housing and electrode sheets disposed inside the housing, a fixing component disposed inside the housing, a sealing cover plate fixed to the upper surface of the housing by the fixing component, an installation component disposed on the surface of the sealing cover plate, and a partition plate fixed to the lower surface of the sealing cover plate.

[0007] The separator plate has two sets, and the top and bottom of the electrode sheet are respectively provided. The surface of the separator plate is provided with a separator groove corresponding to the electrode sheet. The electrode sheet is snapped into the separator groove. The electrode sheet is wound to form an electrode group, and the gap between adjacent electrode sheets corresponds to the spacing of the separator groove.

[0008] Furthermore, the mounting assembly includes a fixing block, the sealing cover has a mounting groove on its surface, the sealing cover is disposed inside the mounting groove, a knob is disposed above the fixing block, a first bevel gear is rotatably connected to the lower surface of the knob via a rotating shaft, a transmission chamber is disposed inside the fixing block, and the first bevel gear is disposed inside the transmission chamber.

[0009] Furthermore, a fixing plate is fixed to the inner wall of the transmission chamber, and a bidirectional threaded rod is rotatably passed through the surface of the fixing plate. A second bevel gear is fixed to the surface of the bidirectional threaded rod. The first bevel gear meshes with the second bevel gear. Both ends of the bidirectional threaded rod are threaded with threaded tubes. A locking block is fixed to the end face of the threaded tube. A locking groove is opened in the inner wall of the mounting groove, and one end of the locking block is locked inside the locking groove.

[0010] Furthermore, a slider is fixed to the side of the threaded tube, and a groove corresponding to the slider is opened on the inner wall of the transmission chamber. The slider moves inside the groove, and the threaded tube moves inside the transmission chamber through the slider and the groove. There are two sliders and two grooves, which are symmetrically arranged on both sides of the threaded tube.

[0011] Furthermore, the fixing component includes a support rod, the surface of the housing has a telescopic groove, one end of the support rod is fixed to the inner wall of the telescopic groove, a limit rod is sleeved on the surface of the support rod, and a limit groove corresponding to the limit rod is opened on the side of the sealing cover plate, one end of the limit rod is engaged inside the limit groove.

[0012] Furthermore, a lever is rotatably connected to the upper surface of the limiting rod, and a movable groove is opened on the upper surface of the sealing cover plate. The movable groove and the telescopic groove are connected. The lever passes through the interior of the movable groove. A stop block is also fixed on the upper surface of the sealing cover plate. The stop blocks are symmetrically arranged on both sides of the lever. A spring is also sleeved on the surface of the support rod. One end of the spring is fixed to the inner wall of the telescopic groove, and the other end of the spring is fixed to the side of the limiting rod.

[0013] This invention provides a leak-proof wound electrode assembly for nickel-metal hydride batteries, which has the following advantages:

[0014] 1. This nickel-metal hydride battery anti-leakage wound electrode assembly has a separator plate with multiple separator grooves on the surface of the separator plate. The spacing between each adjacent separator groove is the same. By snapping the electrode into the separator groove, a certain gap is left between adjacent electrode plates, which reduces the corner deformation and stress accumulation caused by expansion, effectively reduces the risk of lithium plating and breakage, thereby reducing the possibility of leakage and improving the safety and life of the battery.

[0015] 2. This nickel-metal hydride battery leak-proof wound electrode assembly can fix the separator plate to the lower surface of the sealing cover through the installation component. This allows the upper and lower separator plates to clamp and fix the electrode sheets, preventing the electrode sheets from being too tightly packed and improving the stability and reliability of the electrode sheets. At the same time, the separator plate can be removed from the sealing cover and replaced by quickly disassembling the installation component. By selecting a separator plate with an appropriate spacing, it can be adapted to the installation of various specifications of electrode sheets, further improving the applicability of the device.

[0016] 3. The leak-proof spiral-wound electrode assembly of this nickel-metal hydride battery can be fixed to the upper surface of the housing by a fixing component, which can prevent the sealing cover plate with the partition plate from deforming or shifting due to uneven force or external impact, thereby maintaining the overall structure of the battery. At the same time, it can also maintain the sealing effect of the sealing cover plate to prevent liquid leakage or contaminant entry, thereby improving the safety and reliability of the battery. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a partial cross-sectional structural diagram of the present invention;

[0019] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A;

[0020] Figure 4 This utility model Figure 2 Enlarged structural diagram at point B;

[0021] Figure 5 This is a schematic diagram of the structure of the present invention in its disassembled state.

[0022] Explanation of reference numerals in the attached figures

[0023] 1. Housing; 101. Expansion groove; 2. Electrode;

[0024] 3. Sealing cover plate; 301. Slot; 302. Limiting slot; 303. Mounting slot;

[0025] 4. Installation components; 401. Fixing block; 402. Transmission chamber; 403. Knob; 404. First bevel gear; 405. Fixing plate; 406. Double-sided threaded rod; 407. Threaded tube; 408. Clamping block; 409. Slider; 410. Second bevel gear;

[0026] 5. Divider;

[0027] 6. Fixing components; 601. Support rod; 602. Limiting rod; 603. Toggle lever; 604. Spring; 605. Stop block. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0029] Please see Figures 1-5 The present invention proposes the following implementation scheme: a leak-proof wound electrode assembly for nickel-metal hydride batteries, comprising a housing 1 and electrode sheets 2 disposed inside the housing 1. A fixing component 6 is disposed inside the housing 1. A sealing cover plate 3 is fixed to the upper surface of the housing 1 by the fixing component 6. An installation component 4 is disposed on the surface of the sealing cover plate 3. A partition plate 5 is fixed to the lower surface of the sealing cover plate 3. There are two sets of partition plates 5, which are respectively disposed at the top and bottom of the electrode sheets 2. The surface of the partition plate 5 is provided with partition grooves corresponding to the electrode sheets 2. The electrode sheets 2 are snapped into the partition grooves. The electrode sheets 2 are wound to form an electrode assembly, and the gaps between adjacent electrode sheets 2 correspond to the spacing of the partition grooves. The leak-proof wound electrode assembly for nickel-metal hydride batteries, by setting the partition plates 5 and providing multiple partition grooves on the surface of the partition plates 5, with each adjacent partition groove having the same spacing, and by snapping the electrode sheets 2 into the partition grooves, leaves a certain gap between adjacent electrode sheets 2, reducing the corner deformation and stress accumulation caused by expansion, effectively reducing the risk of lithium plating and breakage, thereby reducing the possibility of leakage and improving the safety and lifespan of the battery.

[0030] Please refer to this carefully. Figure 2 , Figure 3 and Figure 5The mounting assembly 4 includes a fixing block 401, a sealing cover plate 3 with a mounting groove 303 on its surface, the sealing cover plate 3 being disposed inside the mounting groove 303, a knob 403 above the fixing block 401, a first bevel gear 404 rotatably connected to the lower surface of the knob 403 via a rotating shaft, a transmission chamber 402 inside the fixing block 401, the first bevel gear 404 being disposed inside the transmission chamber 402, a fixing plate 405 fixed to the inner wall of the transmission chamber 402, a bidirectional threaded rod 406 rotatably passing through the surface of the fixing plate 405, a second bevel gear 410 fixed to the surface of the bidirectional threaded rod 406, the first bevel gear 404 meshing with the second bevel gear 410, threaded tubes 407 threadedly connected to both ends of the bidirectional threaded rod 406, a locking block 408 fixed to the end face of the threaded tube 407, a locking groove 301 on the inner wall of the mounting groove 303, and one end of the locking block 408 locking into... Inside the slot 301, a slider 409 is fixed to the side of the threaded tube 407. A groove corresponding to the slider 409 is opened on the inner wall of the transmission chamber 402. The slider 409 moves within the groove, and the threaded tube 407 moves within the transmission chamber 402 via the slider 409 and the groove. There are two sliders 409 and two grooves, symmetrically arranged on both sides of the threaded tube 407. This nickel-metal hydride battery leak-proof wound electrode assembly can fix the separator plate 5 to the lower surface of the sealing cover plate 3 via the mounting component 4, allowing the upper and lower separator plates 5 to clamp and fix the electrode 2, preventing the electrode 2 from being too tightly packed while improving the stability and reliability of the electrode 2. Simultaneously, the separator plate 5 can be quickly removed from the sealing cover plate 3 and replaced by quickly disassembling the mounting component 4, allowing for the selection of a suitable spacing separator plate 5 to accommodate various specifications of electrode 2, further improving the applicability of the device.

[0031] Please refer to this carefully. Figure 1 , Figure 2 and Figure 4The fixing component 6 includes a support rod 601. A telescopic groove 101 is formed on the surface of the housing 1. One end of the support rod 601 is fixed to the inner wall of the telescopic groove 101. A limiting rod 602 is sleeved on the surface of the support rod 601. A limiting groove 302 corresponding to the limiting rod 602 is formed on the side of the sealing cover 3. One end of the limiting rod 602 is engaged inside the limiting groove 302. A lever 603 is rotatably connected to the upper surface of the limiting rod 602. A movable groove is formed on the upper surface of the sealing cover 3, which is connected to the telescopic groove 101. The lever 603 passes through the movable groove. A stop 605 is also fixed to the upper surface of the sealing cover 3. Blocks 605 are symmetrically arranged on both sides of lever 603. A spring 604 is also sleeved on the surface of support rod 601. One end of spring 604 is fixed to the inner wall of telescopic groove 101, and the other end of spring 604 is fixed to the side of limit rod 602. The leak-proof spiral-wound electrode assembly of this nickel-metal hydride battery can be fixed to the upper surface of the housing 1 by fixing component 6 with sealing cover 3 of partition plate 5, so as to avoid deformation or displacement of sealing cover 3 due to uneven force or external impact, thereby maintaining the overall structure of the battery. At the same time, it can also maintain the sealing effect of sealing cover 3, prevent liquid leakage or contaminant entry, and improve the safety and reliability of the battery.

[0032] In use, the device is first placed in the designated position. Then, the partition plate 5 is placed inside the housing 1, and the lower surface of the electrode assembly formed by the wound electrode sheet 2 is engaged in the partition groove. Next, the worker engages the fixing block 401, which holds the partition plate 5, in the mounting groove 303. Then, the knob 403 is turned, causing the first bevel gear 404 to rotate. The first bevel gear 404 then drives the second bevel gear 410 to rotate, which in turn drives the bidirectional threaded rod 406 to rotate synchronously. The bidirectional threaded rod 406 moves the threaded tube 407, thereby moving the locking block 408 fixed to its end face, so that one end of the locking block 408 engages in the locking groove 3. In step 01, the fixing block 401 is fixed, thereby completing the installation of the top partition plate 5 of the electrode group. Then, the operator presses down the sealing cover plate 3. Since the limiting rod 602 is provided with an inclined surface, after the lower surface of the sealing cover plate 3 contacts the inclined surface of the limiting rod 602, the limiting rod 602 can be pushed to move. When the position of the limiting rod 602 corresponds to the limiting groove 302, under the rebound force of the spring 604, the limiting rod 602 can be pushed to move in the opposite direction, so that the limiting rod 602 is engaged in the limiting groove 302, thereby sealing the housing 1 with the sealing cover plate 3 and engaging the upper surface of the electrode group in the partition groove, thereby separating and fixing the electrode group.

[0033] When it is necessary to open the sealing cover 3, the operator only needs to pull the lever 603. The lever 603 drives the limiting rod 602 to move, so that one end of the limiting rod 602 disengages from the limiting groove 302. After the lever 603 passes the stop block 605, the operator rotates the lever 603 so that the stop block 605 can limit the lever 603. The operator can then remove the sealing cover 3 from the surface of the housing 1.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A leak-proof wound electrode assembly for a nickel-metal hydride battery, comprising a housing (1) and electrode sheets (2) disposed inside the housing (1), characterized in that: The housing (1) is provided with a fixing component (6), and a sealing cover plate (3) is fixed on the upper surface of the housing (1) by the fixing component (6). An installation component (4) is provided on the surface of the sealing cover plate (3), and a partition plate (5) is fixed on the lower surface of the sealing cover plate (3). There are two sets of the partition plate (5), and the top and bottom of the electrode (2) are respectively provided. The surface of the partition plate (5) is provided with a partition groove corresponding to the electrode (2). The electrode (2) is snapped into the partition groove. The electrode (2) is formed into an electrode group by winding. The gap between adjacent electrode (2) corresponds to the spacing of the partition groove.

2. The leak-proof wound electrode assembly for a nickel-metal hydride battery according to claim 1, characterized in that: The mounting assembly (4) includes a fixing block (401), and the sealing cover plate (3) has a mounting groove (303) on its surface. The sealing cover plate (3) is located inside the mounting groove (303). A knob (403) is provided above the fixing block (401). A first bevel gear (404) is rotatably connected to the lower surface of the knob (403) via a rotating shaft. A transmission chamber (402) is provided inside the fixing block (401), and the first bevel gear (404) is located inside the transmission chamber (402).

3. The leak-proof wound electrode assembly for a nickel-metal hydride battery according to claim 2, characterized in that: A fixing plate (405) is fixed to the inner wall of the transmission chamber (402). A bidirectional threaded rod (406) is rotatably passed through the surface of the fixing plate (405). A second bevel gear (410) is fixed to the surface of the bidirectional threaded rod (406). The first bevel gear (404) meshes with the second bevel gear (410). Both ends of the bidirectional threaded rod (406) are threaded with threaded tubes (407). A locking block (408) is fixed to the end face of the threaded tube (407). A locking groove (301) is opened in the inner wall of the mounting groove (303). One end of the locking block (408) is locked inside the locking groove (301).

4. The leak-proof wound electrode assembly for a nickel-metal hydride battery according to claim 3, characterized in that: A slider (409) is fixed to the side of the threaded tube (407). A groove corresponding to the slider (409) is opened on the inner wall of the transmission chamber (402). The slider (409) moves inside the groove. The threaded tube (407) moves inside the transmission chamber (402) through the slider (409) and the groove. There are two sliders (409) and two grooves, which are symmetrically arranged on both sides of the threaded tube (407).

5. The leak-proof wound electrode assembly for a nickel-metal hydride battery according to claim 1, characterized in that: The fixing component (6) includes a support rod (601), and the surface of the housing (1) is provided with a telescopic groove (101). One end of the support rod (601) is fixed to the inner wall of the telescopic groove (101). A limiting rod (602) is sleeved on the surface of the support rod (601). The side of the sealing cover plate (3) is provided with a limiting groove (302) corresponding to the limiting rod (602). One end of the limiting rod (602) is engaged inside the limiting groove (302).

6. The leak-proof wound electrode assembly for a nickel-metal hydride battery according to claim 5, characterized in that: The upper surface of the limiting rod (602) is rotatably connected to a lever (603). The upper surface of the sealing cover plate (3) is provided with a movable groove, which is connected to the telescopic groove (101). The lever (603) passes through the movable groove. The upper surface of the sealing cover plate (3) is also fixed with a stop block (605). The stop block (605) is symmetrically arranged on both sides of the lever (603). The surface of the support rod (601) is also sleeved with a spring (604). One end of the spring (604) is fixed to the inner wall of the telescopic groove (101), and the other end of the spring (604) is fixed to the side of the limiting rod (602).

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