Corrosion-resistant lithium battery cap

Abstract

The utility model discloses a corrosion-resistant lithium battery cap, which belongs to the technical field of lithium batteries and comprises a lithium battery shell, a first insulation sleeve, a positive electrode output screen plate, an insulation sheet, a pressure relief protection piece, a thermistor sheet and a positive electrode packaging shell. According to the utility model, the positioning bayonet is arranged at the top of the positive electrode output screen plate, and the convex ring corresponding to the positioning bayonet is arranged at the bottom of the insulating sheet, so that the position stability of the insulating sheet is ensured, the insulating sheet is not easy to shift, the insulativity of the positive electrode output screen plate and the pressure relief protection piece at the outer side part is ensured, and the pressure relief protection piece is prevented from losing the protection effect; the use is safer.

Description

Technical Field

[0001] The present application relates to the technical field of lithium batteries, and in particular to a corrosion-resistant lithium battery cap. Background Art

[0002] At present, lithium batteries are widely used in all walks of life, and their safety has received special attention.

[0003] The lithium battery cap usually serves as the output end of the positive electrode. It has a thermistor, pressure relief protection component, etc. inside. When working at a high current or under a long load, the temperature inside the battery rises and the resistance of the thermistor increases, thereby reducing the current output. When the pressure inside the lithium battery expands, the pressure relief protection component cuts off the current to prevent further pressurization from causing the lithium battery to explode.

[0004] The existing lithium battery cap has the problem that the insulating spacer between the outer ring of the pressure relief protection part and the battery positive output mesh plate cannot be positioned, and there is a risk of displacement, which makes the pressure relief protection part lose its effect and cannot avoid the explosion problem of the lithium battery. Therefore, the utility model proposes a new type of corrosion-resistant lithium battery cap. Summary of the invention

[0005] The purpose of the present application is to provide a lithium battery cap with higher safety and corrosion resistance.

[0006] In order to achieve the above objectives, the technical solution adopted in this application is:

[0007] A corrosion-resistant lithium battery cap, comprising:

[0008] A lithium battery housing, the lithium battery housing serving as a negative electrode output terminal of the lithium battery, a positive electrode output mesh plate being fixedly mounted on the inner side of the lithium battery housing separated by a first insulating sleeve;

[0009] An insulating sheet, a positioning bayonet is provided at the top of the positive output mesh plate and near the outer ring, the insulating sheet is arranged above the positive output mesh plate, and a protruding ring matching the positioning bayonet is fixedly connected to the bottom end of the insulating sheet;

[0010] A pressure relief protection member, wherein the outer ring portion of the pressure relief protection member is located above the insulating sheet, the middle portion of the pressure relief protection member is recessed downward, and the middle portion of the pressure relief protection member is welded and fixed to the positive output mesh plate;

[0011] A thermistor sheet, wherein the thermistor sheet is arranged above the pressure relief protection component;

[0012] The positive electrode packaging shell is fixedly connected to the first insulating sleeve and presses the thermistor sheet, the pressure relief protection component and the insulating sheet downward.

[0013] Preferably, a bayonet step is provided on the inner side of the top port of the lithium battery housing, the first insulating sleeve is located on the inner side of the lithium battery housing, and a transverse bayonet facing outward is provided on the outer side of the first insulating sleeve, a clamping block is provided on the inner side of the transverse bayonet, and the clamping block is clamped on the inner side of the bayonet step.

[0014] Further preferably, the outer side of the top of the lithium battery housing is provided with an inwardly contracted external step;

[0015] It also includes: a negative electrode fastening sleeve, which is tightly sleeved on the external step of the lithium battery shell, and the negative electrode fastening sleeve is electrically connected to the lithium battery shell.

[0016] Further preferably, the negative electrode fastening sleeve has a central hole, and an annular insulating sleeve is fixedly connected in the central hole of the negative electrode fastening sleeve.

[0017] Further preferably, the top of the positive electrode packaging shell and the portion corresponding to the central hole of the annular insulating sleeve protrude upward.

[0018] Further preferably, it further comprises: an integrated board, wherein a mounting hole is opened on the integrated board, and the negative electrode fastening sleeve is fixedly mounted on the inner side of the mounting hole of the integrated board, and the negative electrode fastening sleeve is electrically connected to the integrated board.

[0019] As another preferred embodiment, the insulating sheet and the thermistor sheet are both ring-shaped.

[0020] Compared with the prior art, the beneficial effects of this application are:

[0021] The utility model provides a positioning bayonet on the top of the positive output mesh plate, and a protruding ring corresponding to the positioning bayonet is provided at the bottom of the insulating sheet, thereby ensuring the stability of the insulating sheet and preventing it from shifting, ensuring the insulation of the positive output mesh plate and the pressure relief protection element at the outer part, avoiding the pressure relief protection element from losing its protection effect, and making it safer to use.

[0022] The utility model improves the structure of the first insulating sleeve so that the lithium battery shell and the first insulating sleeve are fixed by means of a clamping block. When the internal pressure of the lithium battery reaches a critical value, the extrusion force of the clamping block and the clamping step forces the lithium battery shell to deform, thereby removing the lithium battery shell and the internal lithium battery part, thereby preventing a single lithium battery from exploding and affecting other lithium batteries integrated around it. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional schematic diagram of the corrosion-resistant lithium battery cap;

[0024] Figure 2 is a cross-sectional view of the corrosion-resistant lithium battery cap;

[0025] Figure 3 for Figure 2 A partial enlarged view of point B in the middle;

[0026] Figure 4 This is a layered exploded view of the internal structure of the corrosion-resistant lithium battery cap;

[0027] Figure 5 The schematic diagram is a schematic diagram of the integration method of the lithium battery using the corrosion-resistant lithium battery cap.

[0028] In the figure: 1. Negative electrode fastening sleeve; 2. Lithium battery shell; 2a. External step; 2b. Bayonet step; 3. Annular insulating sleeve; 4. First insulating sleeve; 4a. Horizontal bayonet; 5. Block; 6. Positive electrode output mesh plate; 6a. Positioning bayonet; 7. Insulating sheet; 7a. Protruding ring; 8. Pressure relief protection component; 9. Thermistor sheet; 10. Positive electrode packaging shell; 11. Integrated board. DETAILED DESCRIPTION

[0029] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0030] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0031] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0032] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0033] like Figure 1-Figure 5The corrosion-resistant lithium battery cap shown includes a lithium battery shell 2, a first insulating sleeve 4, a positive electrode output mesh plate 6, an insulating sheet 7, a pressure relief protection component 8, a thermistor sheet 9, and a positive electrode packaging shell 10.

[0034] Among them, the lithium battery shell 2 serves as the negative output end of the lithium battery, and a positive output mesh plate 6 is fixedly installed on the inner side of the lithium battery shell 2 separated by a first insulating sleeve 4. The positive output mesh plate 6 and the lithium battery shell 2 are isolated by the first insulating sleeve 4. A positioning bayonet 6a is provided at the top of the positive output mesh plate 6 and close to the outer circle. The insulating sheet 7 is arranged above the positive output mesh plate 6, and the bottom end of the insulating sheet 7 is fixedly connected with a protruding ring 7a that cooperates with the positioning bayonet 6a. The insulating sheet 7 is installed above the positive output mesh plate 6 inside the first insulating sleeve 4, and the protruding ring 7a is inserted into the positioning bayonet 6a, and then the outer circle part of the pressure relief protection component 8 is placed above the insulating sheet 7, the middle part of the pressure relief protection component 8 is recessed downward, and the middle part of the pressure relief protection component 8 is welded and fixed to the positive output mesh plate 6. The pressure relief protection component 8 is made of aluminum, which has corrosion resistance. The welding contact part between the pressure relief protection component 8 and the positive output mesh plate 6 is a conductive connection part.

[0035] The thermistor sheet 9 is arranged above the pressure relief protection member 8, and then the positive electrode packaging shell 10 is fixedly connected to the first insulating sleeve 4, and the positive electrode packaging shell 10 presses the thermistor sheet 9, the pressure relief protection member 8, and the insulating sheet 7 downward, so that the first insulating sleeve 4, the positive electrode output mesh plate 6, the insulating sheet 7, the pressure relief protection member 8, the thermistor sheet 9, and the positive electrode packaging shell 10 are in a fixed state, and the insulating sheet 7 and the thermistor sheet 9 are both ring-shaped.

[0036] When working with high current or long-time load, the temperature inside the lithium battery rises, and the resistance of thermistor 9 increases, thereby reducing the current output; when the pressure inside the lithium battery expands, the pressure relief protection member 8 is pushed up to cut off the current, avoiding further pressurization and causing the lithium battery to explode.

[0037] In one embodiment, a bayonet step 2b is provided on the inner side of the top port of the lithium battery housing 2, the first insulating sleeve 4 is located on the inner side of the lithium battery housing 2, and a transverse bayonet 4a facing outward is provided on the outer side of the first insulating sleeve 4, and a clamping block 5 is provided on the inner side of the transverse bayonet 4a, and the clamping block 5 is clamped on the inner side of the bayonet step 2b.

[0038] The lithium battery housing 2 and the first insulating sleeve 4 are fixed by the clamping block 5. When the internal pressure of the lithium battery reaches a critical value, the squeezing force of the clamping block 5 and the clamping step forces the lithium battery housing 2 to deform, thereby removing the lithium battery housing 2 and the lithium battery part inside, thereby avoiding the explosion of a single lithium battery and affecting other lithium batteries integrated around it.

[0039] In one embodiment, an outer step 2 a contracting inward is provided on the outer side of the top of the lithium battery housing 2 to accommodate the installation of the negative electrode fastening sleeve 1 on the outer side of the top of the lithium battery housing 2 .

[0040] The negative electrode fastening sleeve 1 is tightly sleeved on the outer step 2a of the lithium battery shell 2, and the negative electrode fastening sleeve 1 is electrically connected to the lithium battery shell 2. The negative electrode fastening sleeve 1 can be used as the negative electrode output of the lithium battery.

[0041] In one embodiment, the negative electrode fastening sleeve 1 has a center hole, and an annular insulating sleeve 3 is fixedly connected to the center hole of the negative electrode fastening sleeve 1. The top of the positive electrode packaging shell 10 and the portion corresponding to the center hole of the annular insulating sleeve 3 protrude upward, and a wire can be used to connect the positive electrode packaging shell 10 at the inner side of the annular insulating sleeve 3 as the output of the positive electrode.

[0042] In one embodiment, it further includes: an integrated board 11 , a mounting hole is opened on the integrated board 11 , the negative electrode fastening sleeve 1 is fixedly mounted inside the mounting hole of the integrated board 11 , and the negative electrode fastening sleeve 1 is electrically connected to the integrated board 11 .

[0043] like Figure 5 As shown in , multiple lithium batteries using the corrosion-resistant lithium battery cap structure of the present solution can be installed on the integrated board 11, with the integrated board 11 as a common negative electrode and the positive electrode led out by a wire.

[0044] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A corrosion-resistant lithium battery cap, comprising a lithium battery shell, the lithium battery shell serving as a negative output terminal of the lithium battery, a positive output mesh plate being fixedly mounted on the inner side of the lithium battery shell separated by a first insulating sleeve, characterized in that: Also includes: An insulating sheet, a positioning bayonet is provided at the top of the positive output mesh plate and near the outer ring, the insulating sheet is arranged above the positive output mesh plate, and a protruding ring matching the positioning bayonet is fixedly connected to the bottom end of the insulating sheet; A pressure relief protection member, wherein the outer ring portion of the pressure relief protection member is located above the insulating sheet, the middle portion of the pressure relief protection member is recessed downward, and the middle portion of the pressure relief protection member is welded and fixed to the positive output mesh plate; A thermistor sheet, wherein the thermistor sheet is arranged above the pressure relief protection component; The positive electrode packaging shell is fixedly connected to the first insulating sleeve and presses the thermistor sheet, the pressure relief protection component and the insulating sheet downward.

2. The corrosion-resistant lithium battery cap according to claim 1, characterized in that: A bayonet step is arranged on the inner side of the top port of the lithium battery housing, the first insulating sleeve is located on the inner side of the lithium battery housing, and a transverse bayonet facing outward is arranged on the outer side of the first insulating sleeve, a clamping block is arranged on the inner side of the transverse bayonet, and the clamping block is clamped on the inner side of the bayonet step.

3. The corrosion-resistant lithium battery cap according to claim 2, characterized in that: The outer side of the top of the lithium battery housing is provided with an inwardly contracted external step; It also includes: a negative electrode fastening sleeve, which is tightly sleeved on the external step of the lithium battery shell, and the negative electrode fastening sleeve is electrically connected to the lithium battery shell.

4. The corrosion-resistant lithium battery cap according to claim 3, characterized in that: The negative electrode fastening sleeve has a central hole, and an annular insulating sleeve is fixedly connected in the central hole of the negative electrode fastening sleeve.

5. The corrosion-resistant lithium battery cap according to claim 4, characterized in that: The top of the positive electrode packaging shell and the portion corresponding to the central hole of the annular insulating sleeve protrude upward.

6. The corrosion-resistant lithium battery cap according to claim 5, characterized in that: Also includes: An integrated board is provided with a mounting hole, a negative electrode fastening sleeve is fixedly mounted on the inner side of the mounting hole of the integrated board, and the negative electrode fastening sleeve is electrically connected to the integrated board.

7. The corrosion-resistant lithium battery cap according to claim 1, characterized in that: The insulating sheet and the thermistor sheet are both ring-shaped.

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