Overcharge resistant battery

Abstract

The utility model provides an overcharge-resistant battery, and relates to the technical field of batteries. The utility model is used to solve the technical problem that the existing lithium battery will generate heat and gas when overcharged, which is easy to cause the side reaction of the battery and damage the battery. The overcharge-resistant battery includes a shell, a positive electrode combination is arranged at the upper part of the shell, a battery cell is arranged in the middle part of the shell, a negative electrode combination is arranged at the lower part of the shell, and a first partition plate and a second partition plate are installed inside the shell, the first partition plate is located between the positive electrode combination and the battery cell, the second partition plate is located between the battery cell and the negative electrode combination, and a cavity is formed between the second partition plate and the bottom of the shell. The heat and gas pressure generated when the battery is overcharged are buffered by the setting of the cavity, so as to avoid excessive pressure inside the battery shell, thereby achieving the effect of improving the overcharge resistance of the battery.

Description

Technical Field

[0001] The utility model provides an overcharge-resistant battery, and relates to the technical field of batteries. Background Art

[0002] A battery refers to a cup, trough or other container or part of a composite container that contains an electrolyte solution and a metal electrode to generate an electric current. It is a device that can convert chemical energy into electrical energy and has a positive electrode and a negative electrode. Nickel-metal hydride batteries have the advantages of being environmentally friendly, having a long life, mature technology, being resistant to overcharging, and being highly safe. They are widely used as power sources for cordless phones. As market competition becomes increasingly fierce, the demand for low-cost batteries is getting higher and higher.

[0003] Existing lithium batteries will generate heat and gas when overcharged. The heat includes ohmic heat and heat generated by side reactions, of which ohmic heat accounts for the main part. Overcharging will trigger side reactions of the battery, which can easily damage the battery and greatly reduce the battery life.

[0004] Therefore, it is necessary to provide an overcharge resistant battery, and to improve the overcharge resistance of the battery by setting a cavity. Utility Model Content

[0005] In order to overcome the disadvantages of existing lithium batteries that heat and gas will be generated when overcharged, which may easily cause side reactions of the battery and damage the battery, the utility model provides an overcharge-resistant battery, which improves the overcharge resistance of the battery by setting a cavity.

[0006] In order to achieve the above-mentioned purpose, the embodiment of the utility model provides the following technical solutions: an overcharge resistant battery, comprising a shell, a positive electrode combination, a battery cell and a negative electrode combination, wherein the positive electrode combination is arranged at the upper part of the shell, the battery cell is arranged at the middle part of the shell, and the negative electrode combination is arranged at the lower part of the shell, and also comprises a first partition plate and a second partition plate, wherein the first partition plate and the second partition plate are installed inside the shell, the first partition plate is located between the positive electrode combination and the battery cell, the second partition plate is located between the battery cell and the negative electrode combination, and a cavity is formed between the second partition plate and the bottom of the shell.

[0007] Furthermore, the battery cell is composed of a diaphragm, a positive electrode sheet and a negative electrode sheet, and the diaphragm is arranged between the positive electrode sheet and the negative electrode sheet.

[0008] Furthermore, the ratio of the negative electrode sheet capacity to the positive electrode sheet capacity is between 1.2 and 1.3.

[0009] Furthermore, the positive electrode sheet contains 0.5%-1.5% of yttrium oxide.

[0010] Furthermore, the battery cell capacity is between 200-400mAh.

[0011] Furthermore, the positive electrode combination includes a rubber ring installed inside the outer shell, a transmission plate is sleeved on the rubber ring, a positive transmission line is fixedly connected between the transmission plate and the positive electrode sheet, a positive electrode conductive sheet is installed on the transmission plate, the positive electrode conductive sheet penetrates to the outside of the outer shell, and a positive electrode column is arranged between the positive electrode conductive sheet and the transmission plate.

[0012] Furthermore, the negative electrode assembly includes a negative electrode conductive sheet mounted on the outer shell, and a negative electrode transmission line is fixedly connected between the negative electrode conductive sheet and the negative electrode sheet.

[0013] Furthermore, it also includes an upper meson attached to the top of the battery cell, and a bottom meson attached to the bottom of the battery cell.

[0014] Compared with the prior art, the battery provided by the embodiment of the utility model has the following advantages: 1. The heat and gas pressure generated when the battery is overcharged are buffered by the setting of the cavity, thereby avoiding excessive pressure inside the battery casing and achieving the effect of improving the overcharge resistance of the battery.

[0015] 2. By controlling the battery capacity and adjusting the positive and negative electrode capacity ratio, the battery cost can be reduced.

[0016] 3. By adding yttrium oxide to the positive electrode, the overcharge resistance of the battery can be improved.

[0017] 4. By setting the upper meson and the bottom meson, the efficiency of electric energy outflow and return can be enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0019] Figure 2 The utility model is a three-dimensional cross-sectional structural schematic diagram of the housing, the positive electrode conductive sheet and the positive electrode column.

[0020] Figure 3 It is a three-dimensional cross-sectional structural schematic diagram of the battery cell, negative electrode conductive sheet and negative electrode transmission line of the utility model.

[0021] Figure 4 It is a three-dimensional structural schematic diagram of the diaphragm, positive electrode sheet and negative electrode sheet of the utility model.

[0022] In the above figures: 1: shell, 2: positive electrode conductive sheet, 3: positive electrode column, 4: transmission plate, 5: battery cell, 501: diaphragm, 502: positive electrode sheet, 503: negative electrode sheet, 6: negative electrode conductive sheet, 7: positive electrode transmission line, 701: negative electrode transmission line, 8: rubber ring, 9: upper pion, 901: bottom pion, 902: first partition plate, 903: second partition plate, 10: cavity. DETAILED DESCRIPTION

[0023] Reference to an embodiment herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0024] Embodiment 1: An overcharge resistant battery, see Figure 1-Figure 4 As shown, it includes a shell 1, a positive electrode combination, a battery cell 5 and a negative electrode combination. The positive electrode combination is arranged at the upper part of the shell 1, and the battery cell 5 is arranged in the middle part of the shell 1. The capacity of the battery cell 5 is between 200-400mAh. The negative electrode combination is arranged at the lower part of the shell 1, and also includes a first partition plate 902 and a second partition plate 903. The first partition plate 902 and the second partition plate 903 are installed in the shell 1 by welding. The first partition plate 902 is located between the positive electrode combination and the battery cell 5, and the second partition plate 903 is located between the battery cell 5 and the negative electrode combination. A cavity 10 is formed between the second partition plate 903 and the bottom of the shell 1.

[0025] See also Figure 4 As shown, the battery cell 5 is composed of a diaphragm 501, a positive electrode sheet 502 and a negative electrode sheet 503. The diaphragm 501 is arranged between the positive electrode sheet 502 and the negative electrode sheet 503. The positive electrode sheet 502 contains 0.5%-1.5% yttrium oxide for absorbing oxygen and capacity generated by overcharging. The ratio of the capacity of the negative electrode sheet 503 to the capacity of the positive electrode sheet 502 is between 1.2-1.3, which is used to increase the capacity of the negative electrode sheet 503 to accommodate the products generated by overcharging, so as to enhance the overcharge resistance of the battery.

[0026] See also Figure 2 and Figure 3 As shown, the positive electrode combination includes a rubber ring 8 installed inside the shell 1 by adhesive bonding, and a transmission plate 4 for conducting electric energy is sleeved on the rubber ring 8. A positive transmission line 7 is fixedly connected between the transmission plate 4 and the positive electrode sheet 502. A positive electrode conductive sheet 2 is installed on the upper part of the transmission plate 4. The positive electrode conductive sheet 2 penetrates to the outer top of the shell 1, and a positive electrode column 3 is arranged between the positive electrode conductive sheet 2 and the transmission plate 4; the negative electrode combination includes a negative electrode conductive sheet 6 installed at the bottom of the shell 1 by welding, and a negative electrode transmission line 701 is fixedly connected between the negative electrode conductive sheet 6 and the negative electrode sheet 503.

[0027] When the battery is overcharged, heat and gas will be generated inside the battery casing 1, increasing the internal pressure of the casing 1. The cavity 10 can buffer the internal pressure of the casing 1, thereby improving the overcharge resistance of the battery. At the same time, when overcharged, excess lithium will be embedded in the negative electrode sheet 503 and generate lithium dendrites on the negative electrode sheet 503. The larger capacity of the negative electrode sheet 503 can support and accommodate the generated lithium dendrites. Excess lithium enters the positive electrode sheet 502 and releases heat and oxygen. The heat and oxygen are absorbed by the yttrium oxide, thereby reducing the internal pressure of the battery and avoiding damage to the positive electrode.

[0028] Example 2: Based on Example 1, refer to Figure 2 and Figure 3 As shown, it also includes an upper pion 9 attached to the top of the battery cell 5 , and a bottom pion 901 attached to the bottom of the battery cell 5 .

[0029] The upper meson 9 and the bottom meson 901 are used to enhance the mutual force. When the battery is in use, the upper meson 9 enhances the efficiency of ion transmission from the positive electrode sheet 502 through the positive electrode transmission line 7 to the outside, and the bottom meson 901 enhances the efficiency of ion flow back to the negative electrode sheet 503 through the negative electrode transmission line 701.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. An overcharge resistant battery, comprising a housing (1), a positive electrode assembly, a battery cell (5) and a negative electrode assembly, wherein the positive electrode assembly is arranged at the upper part of the housing (1), the battery cell (5) is arranged at the middle part of the housing (1), and the negative electrode assembly is arranged at the lower part of the housing (1), wherein: The invention also comprises a first separator (902) and a second separator (903), wherein the first separator (902) and the second separator (903) are installed inside the housing (1), wherein the first separator (902) is located between the positive electrode assembly and the battery cell (5), and the second separator (903) is located between the battery cell (5) and the negative electrode assembly, and a cavity (10) is formed between the second separator (903) and the bottom of the housing (1).

2. An overcharge-resistant battery according to claim 1, characterized in that: The battery cell (5) is composed of a diaphragm (501), a positive electrode sheet (502) and a negative electrode sheet (503), wherein the diaphragm (501) is arranged between the positive electrode sheet (502) and the negative electrode sheet (503).

3. An overcharge-resistant battery according to claim 2, characterized in that: The ratio of the capacity of the negative electrode sheet (503) to the capacity of the positive electrode sheet (502) is between 1.2 and 1.

3.

4. An overcharge-resistant battery according to claim 1, characterized in that: The capacity of the battery cell (5) is between 200-400 mAh.

5. An overcharge-resistant battery according to claim 2, characterized in that: The positive electrode assembly comprises a rubber ring (8) installed inside the outer shell (1), a transmission plate (4) is sleeved on the rubber ring (8), a positive electrode transmission line (7) is fixedly connected between the transmission plate (4) and the positive electrode sheet (502), a positive electrode conductive sheet (2) is installed on the transmission plate (4), the positive electrode conductive sheet (2) penetrates to the outside of the outer shell (1), and a positive electrode column (3) is arranged between the positive electrode conductive sheet (2) and the transmission plate (4).

6. An overcharge-resistant battery according to claim 2, characterized in that: The negative electrode assembly comprises a negative electrode conductive sheet (6) mounted on the housing (1), and a negative electrode transmission line (701) is fixedly connected between the negative electrode conductive sheet (6) and the negative electrode sheet (503).

7. An overcharge-resistant battery according to claim 1, characterized in that: It also includes an upper meson (9) attached to the top of the battery core (5), and a bottom meson (901) attached to the bottom of the battery core (5).

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