Power battery sealing device

Abstract

The utility model belongs to the field of battery preparation devices, and particularly relates to a power battery sealing device which comprises an initial height limiting unit and a shell, the initial height limiting unit comprises an inner screw rod, an inner threaded sleeve arranged outside the inner screw rod and connected with the inner screw rod, an initial limiting knob connected with the inner threaded sleeve, and an initial limiting block arranged outside the inner threaded sleeve and connected with the inner threaded sleeve; a limiting block is arranged on the inner screw rod; an internal thread sleeve sliding groove matched with the limiting block is formed in the internal thread sleeve; a shell sliding groove is formed in the shell. The limiting block and the initial limiting block are provided with a limiting block sliding block and an initial limiting block sliding block respectively, wherein the limiting block sliding block and the initial limiting block sliding block are matched with the shell sliding groove. By using the sealing device for the power battery disclosed by the utility model, the operation safety can be improved while the liquid retention capacity of the battery is ensured.

Description

Technical Field

[0001] The utility model belongs to the field of battery preparation devices, and particularly relates to a power battery sealing device. Background Art

[0002] Improving the energy density of battery cells is an important development direction for lithium-ion batteries. The energy density of a battery refers to the electrical energy released per unit volume or mass of the battery on average. The main ways to improve the energy density of lithium-ion batteries include developing high-compaction materials, cathode materials with high specific capacity and high discharge voltage platforms, anode materials with high specific capacity, electrolytes with high applicability, etc. During the development of high-energy-density battery cells, as the compaction density of the positive and negative electrode materials increases, the liquid immersion ability of the electrode sheets relatively weakens, and it is often impossible to ensure the qualified battery thickness and liquid retention amount simultaneously in the sealing process.

[0003] At present, there are three ways to seal lithium-ion batteries: extrusion sealing, negative pressure sealing, and extrusion negative pressure sealing. First of all, extrusion sealing has extremely high requirements for the liquid absorption of the battery. If there is too much suspended electrolyte in the battery, excessive electrolyte will be ejected during extrusion sealing, resulting in the net liquid volume of the battery being lower than the lower limit value. The negative pressure sealing method is a commonly used sealing method. If the battery has a suspension, electrolyte loss is likely to occur during the negative pressure pumping process, and the thickness of the battery is also likely to be not guaranteed. The extrusion negative pressure sealing combines the first two methods. For batteries with too much suspended liquid in the battery, electrolyte loss is likely to occur during both the extrusion and negative pressure pumping processes, resulting in the unqualified net liquid volume of the battery. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the defects in the prior art and provide a power battery sealing device.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A power battery sealing device includes an initial height limiting unit and a housing; the initial height limiting unit includes an inner screw rod, an internal thread sleeve arranged outside the inner screw rod and connected to the inner screw rod, an initial limit knob connected to the internal thread sleeve, and an initial limit block arranged outside the internal thread sleeve and connected to the internal thread sleeve; a limit block is arranged on the inner screw rod; an internal thread sleeve chute matching the limit block is arranged on the internal thread sleeve; a housing chute is arranged on the housing; a limit block slider and an initial limit block slider matching the housing chute are respectively arranged on the limit block and the initial limit block.

[0007] It further includes a pressing distance limiting unit; the pressing distance limiting unit includes an external thread sleeve arranged outside the internal thread sleeve, a height limiting knob connected to the external thread sleeve, and a height limiting block arranged outside the external thread sleeve and connected to the external thread sleeve; a height limiting block slider matching the housing chute is arranged on the height limiting block.

[0008] The external thread sleeve is connected to the height limiting knob through a limit linkage intermediate body; the external thread of the external thread sleeve is connected to the limit linkage intermediate body; the limit linkage intermediate body and the height limiting knob are connected by bolts.

[0009] A fixed linkage housing is arranged outside the limit linkage intermediate body.

[0010] An internal spring body is arranged between the internal screw rod and the internal thread sleeve; the internal spring body is arranged below the limit block.

[0011] An external spring body is arranged between the external thread sleeve and the housing; the external spring body is arranged below the height limiting block.

[0012] Through holes for the internal screw rod to pass through are arranged on the initial limiting knob and the housing.

[0013] A spray head protector is arranged at the lower part of the housing.

[0014] The spray head protector includes a head fixing cap connected to the housing and a rubber plug support arranged inside the head fixing cap.

[0015] A housing sliding buckle is arranged at the bottom of the housing; a fixing cap sliding buckle matching the housing sliding buckle is arranged on the head fixing cap.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The battery cell sealing device of the present utility model can rotate the initial limit knob of the initial height limiting unit, drive the internally threaded sleeve connected thereto to rotate, and then drive the initial limit block slider connected to the internally threaded sleeve to slide up and down in the outer shell chute, so as to realize the initial positioning of the rubber plug in the rubber plug holder that is in contact connection with the top of the internal thread, ensuring that only a small amount of electrolyte overflows during the extrusion sealing process of the battery. If the position is too shallow, too much electrolyte will overflow and the liquid retention amount will not meet the standard; if the position is too deep, the battery will be sealed and the electrolyte and liquid cannot be discharged, resulting in an oversized battery thickness. As a preferred form thereof, at the same time, a pressing distance limiting unit is provided. By rotating the height limit knob, the externally threaded sleeve connected thereto can be driven to rotate, and then the height limit block connected to the externally threaded sleeve can be driven to move up and down in the outer shell chute, so as to fix the downward displacement of the rubber plug, avoiding the rubber plug protruding due to too small a displacement or the rubber plug being lower than the liquid injection port due to too large a displacement. Using the battery cell sealing device of the present utility model can ensure the liquid retention amount of the battery while improving the operation safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a partial cross-sectional structural schematic diagram of the battery cell sealing device of the present utility model;

[0019] Figure 2 is a structural schematic diagram of each component of the battery cell sealing device of the present utility model;

[0020] Figure 3 is a connection schematic diagram of some components of the battery cell sealing device of the present utility model;

[0021] Figure 4 is a partial structural schematic diagram of the battery cell sealing device of the present utility model;

[0022] Figure 5 is an operation schematic diagram of the battery cell sealing device of the present utility model;

[0023] In the figure: 1, rubber plug holder; 2, head fixing cap; 3, outer shell buckle; 4, outer spring body; 5, outer shell; 6, inner screw; 70, initial limit knob; 71, height limit knob; 72, fixed linkage housing; 90, initial limit block; 91, limit block; 92, height limit block; 11, internally threaded sleeve; 111, limit linkage intermediate body; 12, inner spring; 13, externally threaded sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] In order to enable those skilled in the art of the present technology to better understand the technical solutions of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and the best embodiments.

[0025] Figures 1-5Disclosed is a power battery sealing device, including an initial height limiting unit and a housing; the initial height limiting unit includes an inner screw 6, an internal thread sleeve 11 disposed outside the inner screw and connected to the inner screw 6, an initial limit knob 70 connected to the internal thread sleeve, and an initial limit block 90 disposed outside the internal thread sleeve and connected to the internal thread sleeve;

[0026] The internal thread sleeve includes an internal thread sleeve body and an internal thread sleeve connecting body disposed at the top of the internal thread sleeve body; the initial limit block 90 is threadedly connected to the outside of the internal thread sleeve body; the thread sleeve connecting body is threadedly connected to the initial limit knob 70;

[0027] A limit block 92 is provided on the inner screw; an internal thread sleeve chute matching the limit block is provided on the internal thread sleeve; a housing chute is provided on the housing;

[0028] A limit block slider and an initial limit block slider matching the housing chute are respectively provided on the limit block 91 and the initial limit block 90 so that the rotational motion can be converted into a linear motion.

[0029] The limit block 91 is in a "cross" shape and can move in the chute of the internal thread sleeve;

[0030] It further includes a pressing distance limiting unit; the pressing distance limiting unit includes an external thread sleeve 13 disposed outside the internal thread sleeve, a height limit knob 71 connected to the external thread sleeve, and a height limit block 92 disposed outside the external thread sleeve 13 and connected to the external thread sleeve; a height limit block slider matching the housing chute is provided on the height limit block 13.

[0031] The external thread sleeve 13 is connected to the height limit knob 71 through a limit linkage intermediate body 111; the external thread of the external thread sleeve 13 is connected to the limit linkage intermediate body 111; the limit linkage intermediate body 111 and the height limit knob 71 are connected by bolts.

[0032] A fixed linkage housing 72 is provided outside the limit linkage intermediate body 111.

[0033] An inner spring body 4 is provided between the inner screw 6 and the internal thread sleeve; the inner spring body is provided below the limit block.

[0034] An outer spring body 4 is provided between the external thread sleeve 13 and the housing 5; the outer spring body 4 is provided below the height limit block 92.

[0035] The described initial limit knob 70 and the housing 5 are provided with through holes for the inner screw to pass through.

[0036] A spray head guard is provided at the lower part of the housing. The spray head guard includes a head fixing cap 2 connected to the housing 5 and a rubber plug holder 1 arranged inside the head fixing cap. A housing sliding buckle 3 is provided at the bottom of the housing 5; a fixing cap sliding buckle matching the housing sliding buckle is provided on the head fixing cap. The spray head guard is connected to the housing 5 by connecting the fixing cap sliding buckle and the housing sliding buckle.

[0037] The installation and use method of the above power battery sealing device adopts the following steps:

[0038] Positioning: First, align the spray head guard completely with the liquid injection port of the battery to avoid abrasion of the rubber plug and the battery cover during the downward pressing process;

[0039] Initial position: The bottom of the inner screw 6 contacts the rubber plug inside the rubber plug holder 1. By adjusting the initial limit knob 70, the initial height position of the rubber plug is adjusted. The ideal state should be that about half of the rubber plug is placed in the liquid injection port to ensure that only a small amount of electrolyte overflows during the extrusion sealing process of the battery. If the position is too shallow, too much electrolyte overflows and the liquid retention is unqualified; if the position is too deep, the battery will be sealed and the electrolyte and liquid cannot be discharged, resulting in a too large battery thickness.

[0040] Downward pressing displacement: By adjusting the height limit knob 71, the downward pressing displacement of the inner screw 6, that is, the downward pressing displacement of the rubber plug, is adjusted to avoid the rubber plug protruding due to too small a displacement or the rubber plug being lower than the liquid injection port due to too large a displacement.

[0041] Use: After the above parameters are debugged, place the rubber plug on the spray head guard and it can be used. After the battery reaches the extrusion cut-off condition (pressure or gap), press the top of the inner screw to complete the sealing action of the rubber plug.

[0042] The battery cell sealing device of the present utility model can be applicable to square battery cells. By rotating the initial limit knob of the initial height limiting unit, the internally threaded sleeve connected thereto can be driven to rotate, and then the initial limit block slider connected to the internally threaded sleeve can be driven to slide up and down in the outer shell chute, so as to realize the initial positioning of the rubber plug in the rubber plug holder that is in contact connection with the top of the internal thread, ensuring that only a small amount of electrolyte overflows during the extrusion sealing process of the battery cell. If the position is too shallow, too much electrolyte will overflow and the liquid retention amount will not meet the standard; if the position is too deep, the battery cell will be sealed and the electrolyte and liquid cannot be discharged, resulting in a too large thickness of the battery cell; as a preferred form thereof, at the same time, a pressing distance limiting unit is provided. By rotating the height limit knob, the externally threaded sleeve connected thereto can be driven to rotate, and then the height limit block connected to the externally threaded sleeve can be driven to move up and down in the outer shell chute, so as to fix the downward displacement of the rubber plug, avoiding the rubber plug protruding due to too small a displacement or the rubber plug being lower than the liquid injection port due to too large a displacement.

[0043] Using the battery cell sealing device of the present utility model can ensure the liquid retention amount of the battery cell and improve the operation safety at the same time.

[0044] The above content is only a preferred embodiment of the present utility model. For those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A power battery sealing device, characterized in that: It includes an initial height limiting unit and an outer shell; the initial height limiting unit includes an internal screw, an internal threaded sleeve arranged outside the internal screw and connected to the internal screw, an initial limit knob connected to the internal threaded sleeve, and an initial limit block arranged outside the internal threaded sleeve and connected to the internal threaded sleeve; the internal screw is provided with a limiting block; the internal threaded sleeve is provided with an internal threaded sleeve groove matching the limiting block; the outer shell is provided with an outer shell groove; the limiting block and the initial limiting block are respectively provided with a limiting block slider matching the outer shell groove and an initial limiting block slider.

2. The power battery sealing device according to claim 1, characterized in that: It also includes a pressing distance limiting unit; the pressing distance limiting unit includes an externally threaded sleeve arranged outside the internally threaded sleeve, a height limiting knob connected to the externally threaded sleeve, and a height limiting block arranged outside the externally threaded sleeve and connected to the externally threaded sleeve; the height limiting block is provided with a height limiting block slider matching the outer shell slide groove.

3. The power battery sealing device according to claim 2, characterized in that: The externally threaded sleeve is connected to the height limit knob via a limit linkage intermediate; the external thread of the externally threaded sleeve is connected to the limit linkage intermediate; the limit linkage intermediate is connected to the height limit knob via bolts.

4. The power battery sealing device according to claim 3, characterized in that: A fixed linkage shell is arranged outside the position-limiting linkage intermediate body.

5. The power battery sealing device according to claim 1, characterized in that: An inner spring body is arranged between the inner screw rod and the inner threaded sleeve; the inner spring body is arranged below the limit block.

6. The power battery sealing device according to claim 2, characterized in that: An outer spring body is arranged between the external threaded sleeve and the outer shell; and the outer spring body is arranged below the height limiting block.

7. The power battery sealing device according to claim 1, characterized in that: The initial limit knob and the housing are provided with a through hole for the inner screw to pass through.

8. The power battery sealing device according to claim 1, characterized in that: The lower part of the shell is provided with a spray prevention head.

9. The power battery sealing device according to claim 8, characterized in that: The spray prevention head comprises a head fixing cap connected to the shell and a rubber plug holder arranged in the head fixing cap.

10. The power battery sealing device according to claim 9, characterized in that: The bottom of the shell is provided with a shell sliding buckle; the head fixing cap is provided with a fixing cap sliding buckle matching with the shell sliding buckle.

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