Zinc-nickel battery

Abstract

In order to solve the problem that the internal resistance and the stability of the zinc-nickel battery are influenced due to poor contact between a positive tab of the zinc-nickel battery and a metal shell in the prior art, the utility model provides the zinc-nickel battery which comprises a battery pole group, the metal shell and electrolyte, and the battery pole group is accommodated in the metal shell; the battery pole group comprises a positive electrode and a negative electrode; an insulating film layer is arranged between the battery pole group and the metal shell, and the battery pole group is coated with the insulating film layer; and the free end of the positive tab penetrates out of the insulating film layer and is in contact with and electrically connected with the inner surface of the metal shell. According to the zinc-nickel battery provided by the utility model, the insulating film layer is arranged between the battery pole group and the metal shell, and the battery pole group is coated by the insulating film layer, so that the battery pole group is prevented from being in direct contact with the metal shell, the side reaction caused by the contact between the cathode and the metal shell is avoided, and in addition, the contact between the anode lug and the metal shell is increased; and the current transmission efficiency and stability of the zinc-nickel battery are improved while the internal resistance of the battery is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery manufacturing, and particularly relates to a zinc-nickel battery. Background Art

[0002] Nickel-zinc batteries have a higher output voltage, which gives them an advantage in applications requiring higher voltages. With the widespread use of nickel-zinc batteries, the requirements for their overall electrical performance are also becoming increasingly higher.

[0003] In the prior art, nickel-zinc batteries all use nickel-plated steel as the battery shell. The inherent potential difference between metals such as nickel and iron and the negative electrode zinc metal causes the entire battery chemical system to be extremely unstable, and side reactions such as hydrogen evolution and passivation are serious. Therefore, the battery cycle life is short and the long-term storage capacity recovery performance is poor. To solve this problem, researchers have also taken many improvement measures, such as plating the steel shell with metals with high hydrogen evolution overpotentials such as tin / silver, or using metal foil to isolate the electrode group from the shell. These measures have alleviated the side reactions to a certain extent, but cannot fundamentally solve the problem. During long-term use or storage, the negative electrode Zn material will still produce side reactions with the steel shell through the alkaline solution, affecting the battery performance. In addition, the design of nickel-zinc batteries usually adopts the method of welding the tabs to the current collector and then correspondingly connecting them to the cap and metal shell. However, nickel-zinc batteries are prone to uneven current distribution, zinc dendrites, and zinc dendrites damaging the diaphragm during repeated charge and discharge. The occurrence of the above situation will affect the contact and connection stability between the tabs and the metal shell of the nickel-zinc battery, resulting in an increase in the internal resistance of the nickel-zinc battery, which is not conducive to improving the overall electrical performance of the nickel-zinc battery. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a zinc-nickel battery for the problem that the positive electrode ear of the zinc-nickel battery in the prior art has poor contact with the metal shell, thereby affecting the internal resistance and stability of the zinc-nickel battery.

[0005] The technical solutions adopted by the present invention to solve the above technical problems are as follows:

[0006] Provided is a zinc-nickel battery comprising a battery electrode group, a metal shell, and an electrolyte, wherein the battery electrode group is accommodated in the metal shell;

[0007] The battery electrode group includes a positive electrode, a negative electrode and a separator, and the separator is separated from the positive electrode and the negative electrode;

[0008] An insulating film layer is provided between the battery electrode group and the metal shell, and the insulating film layer covers the battery electrode group;

[0009] The electrolyte is injected into the inner side of the insulating film layer;

[0010] The positive electrode is led out with a positive electrode tab, the free end of the positive electrode tab passes through the outside of the insulating film layer and contacts and is electrically connected to the inner surface of the metal shell.

[0011] Optionally, the positive electrode tab includes a first tab segment, a second tab segment, and a third tab segment connected in sequence;

[0012] The first tab segment is connected to the positive electrode, and the first tab segment is provided through the insulating film layer;

[0013] One end of the first tab segment and the second tab segment are located between the insulating film layer and the bottom of the metal shell; the first end of the second tab segment is connected to the end of the first tab segment that passes through the insulating film layer, and one side of the second tab segment is in contact with and electrically connected to the bottom of the metal shell;

[0014] The third pole lug segment is located between the insulating film layer and the side of the metal shell; one end of the third pole lug segment is connected to the second end of the second pole lug segment; one side of the third pole lug segment is in contact with and electrically connected to the side of the metal shell.

[0015] Optionally, a plurality of reinforcing protrusions are provided on the positive electrode tab, and the plurality of reinforcing protrusions are in contact with and electrically connected to the metal shell.

[0016] Optionally, the reinforcing protrusion is provided on both the second tab segment and the third tab segment.

[0017] Optionally, a plurality of the reinforcing protrusions are distributed at intervals on the surface of the positive electrode tab.

[0018] Optionally, the cross-section of the reinforcing protrusion is triangular or rectangular.

[0019] Optionally, the first tab segment is led out from the positive electrode and extends toward the bottom of the metal shell;

[0020] The second tab segment extends from the first tab segment toward a side of the metal shell;

[0021] The third tab segment extends from the second end of the second tab segment toward the top of the metal shell.

[0022] Optionally, the battery electrode group further includes a separator and an electrolyte, the positive electrode, the negative electrode and the separator are wound to form the battery electrode group, and the electrolyte is injected into the metal shell;

[0023] An insulating film layer is provided between the battery electrode group and the metal shell, and the insulating film layer covers the battery electrode group;

[0024] The first pole tab segment is provided through the insulating film layer, and one end of the first pole tab segment for connecting with the second pole tab segment is located between the insulating film layer and the bottom of the metal shell.

[0025] Optionally, the nickel-zinc battery further includes a cap;

[0026] The metal shell is a semi-enclosed shell with an opening, and the cap closes the opening of the metal shell;

[0027] The cap is insulated and connected to the metal shell;

[0028] The negative electrode is led out with a negative electrode tab, which extends to the cap and is electrically connected to the cap.

[0029] Optionally, the metal shell is made of aluminum and its alloys, iron and its alloys, or copper and its alloys.

[0030] Optionally, the insulating film layer is made of PP material, PE material or polyimide material.

[0031] The beneficial effects of the present invention are:

[0032] The zinc-nickel battery provided by the present invention effectively prevents direct contact between the battery electrode group and the metal shell by providing an insulating film layer between the battery electrode group and the metal shell and covering the battery electrode group with the insulating film layer, thereby avoiding side reactions caused by the contact between the negative electrode of the battery electrode group and the metal shell. That is, the use of the insulating film layer improves the safety of the zinc-nickel battery. In addition, the arrangement of the positive electrode tab of the present application extending out of the insulating film layer to contact and electrically connect with the inner surface of the metal shell increases the contact area between the positive electrode tab and the metal shell, thereby reducing the internal resistance of the battery and improving the current transmission efficiency and stability of the zinc-nickel battery. In addition, the zinc-nickel battery of the present application has a simple structure and is easy to assemble, which is conducive to improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the structure of the zinc-nickel battery provided by the utility model;

[0034] Figure 2 yes Figure 1 A magnified view of the structure in the middle.

[0035] The reference numerals in the drawings of the specification are as follows:

[0036] 1. Battery electrode group; 2. Metal shell; 3. Insulating film layer; 4. Positive electrode ear; 41. Reinforced protrusion; 42. First electrode ear segment; 43. Second electrode ear segment; 44. Third electrode ear segment; 5. Negative electrode ear; 6. Cap. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] In the description of the present invention, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0039] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0040] Reference Figures 1 and 2 , the embodiment of the utility model provides a zinc-nickel battery, comprising a battery electrode group 1, a metal shell 2 and an electrolyte, wherein the battery electrode group 1 is accommodated in the metal shell 2;

[0041] The battery electrode group 1 includes a positive electrode, a negative electrode and a separator, and the separator is separated from the positive electrode and the negative electrode;

[0042] An insulating film layer 3 is provided between the battery electrode group 1 and the metal shell 2, and the insulating film layer 3 covers the battery electrode group 1;

[0043] The electrolyte is injected into the inner side of the insulating film layer 3 ; the positive electrode is led out with a positive electrode ear 4 , the free end of the positive electrode ear 4 passes through the outside of the insulating film layer 3 and contacts and is electrically connected to the inner surface of the metal shell 2 .

[0044] Specifically, the zinc-nickel battery provided by the present invention effectively prevents direct contact between the battery electrode group and the metal shell by providing an insulating film layer between the battery electrode group and the metal shell and covering the battery electrode group with the insulating film layer, thereby avoiding side reactions caused by the contact between the negative electrode of the battery electrode group and the metal shell. That is, the application of the insulating film layer improves the safety of the zinc-nickel battery. In addition, the arrangement of the positive electrode tab of the present application extending out of the insulating film layer to contact and electrically connect with the inner surface of the metal shell increases the contact area between the positive electrode tab and the metal shell, thereby reducing the internal resistance of the battery and improving the current transmission efficiency and stability of the zinc-nickel battery. In addition, the zinc-nickel battery of the present application has a simple structure and is easy to assemble, which is conducive to improving production efficiency.

[0045] In one embodiment, the positive electrode tab 4 includes a first tab segment 42 , a second tab segment 43 and a third tab segment 44 connected in sequence;

[0046] The first tab segment 42 is connected to the positive electrode, and the first tab segment 42 is provided through the insulating film layer 3;

[0047] One end of the first tab segment 42 and the second tab segment 43 are located between the insulating film layer 3 and the bottom of the metal shell 2. The first end of the second tab segment 43 is connected to the first tab segment 42, and one end of the second tab segment 43 extends out of the insulating film layer 3. One side of the second tab segment 43 contacts and is electrically connected to the bottom of the metal shell 2.

[0048] The third pole lug segment 44 is located between the insulating film layer 3 and the side of the metal shell 2; one end of the third pole lug segment 44 is connected to the second end of the second pole lug segment 43; one side of the third pole lug segment 44 is in contact with and electrically connected to the side of the metal shell 2.

[0049] Specifically, in the zinc-nickel battery provided by the present invention, the positive electrode tab 4 includes a first tab segment 42, a second tab segment 43, and a third tab segment 44 connected in sequence. The first tab segment 42 is connected to the positive electrode. This connection arrangement can ensure that current can be efficiently transmitted from the electrode to the positive tab 4. The first end of the second tab segment 43 is connected to the first tab segment 42, and at the same time, one side is in contact with and electrically connected to the bottom of the metal shell 2. This arrangement helps to disperse the current and increase the stability of the connection between the positive tab 4 and the zinc-nickel battery. The third tab segment 44 is connected to the second end of the second tab segment 43 and is in contact with and electrically connected to the side of the metal shell 2, which can further optimize the current distribution and reduce energy loss. At the same time, the contact between the second tab segment 43 and the bottom of the shell provides an additional support point, thereby enhancing the mechanical strength of the zinc-nickel battery. The contact between the third tab segment 44 and the side of the shell not only optimizes the current path, but also helps to dissipate heat, thereby extending the battery life.

[0050] That is, by connecting the first tab segment 42, the second tab segment 43 and the third tab segment 44 of the positive tab 4 with the metal shell 2, the contact strength between the positive tab 4 and the metal shell 2 is increased, which is beneficial to improving the current transmission efficiency and stability of the zinc-nickel battery while reducing the internal resistance of the battery. In addition, the positive tab 4 provided in the present application has a simple structure and is easy to assemble with the zinc-nickel battery, which is beneficial to improving production efficiency.

[0051] In one embodiment, a plurality of reinforcing protrusions 41 are provided on the positive electrode tab 4 , and the plurality of reinforcing protrusions 41 are in contact with and electrically connected to the metal shell 2 .

[0052] Specifically, by providing a plurality of reinforcing protrusions 41 on the positive electrode tab 4, when the positive electrode tab 4 is connected to the metal shell 2, the provision of the plurality of reinforcing protrusions 41 increases the contact area between the positive electrode tab 4 and the metal shell 2, which is beneficial to reducing the internal resistance of the battery and improving the current transmission efficiency of the zinc-nickel battery.

[0053] In one embodiment, the second tab segment 43 and the third tab segment 44 are both provided with the reinforcement protrusion 41 .

[0054] Specifically, since one side of the second pole lug segment 43 and the third pole lug segment 44 are in contact with the bottom of the metal shell 2, the purpose of providing the reinforcing protrusion 41 on the second pole lug segment 43 and the third pole lug segment 44 is to further increase the contact area between the second pole lug segment 43 and the third pole lug segment 44 and the metal shell 2.

[0055] In one embodiment, a plurality of the reinforcing protrusions 41 are distributed at intervals on the surface of the positive electrode tab 4 .

[0056] Reference Figure 2 In one embodiment, the reinforcing protrusion 41 is triangular or rectangular.

[0057] Specifically, a plurality of reinforcing protrusions 41 are provided on the positive electrode tab 4, and the plurality of reinforcing protrusions 41 are connected to the metal shell 2. This design increases the contact area between the positive electrode tab 4 and the metal shell 2, and improves the current transmission efficiency and stability. That is, under the condition that the contact between the positive electrode tab 4 and the metal shell 22 can be achieved, the specific cross-sectional shape of the reinforcing protrusion 41 described in the present application can be a triangle, a rectangle or other special-shaped structure.

[0058] In one embodiment, the first tab segment 42 is led out from the positive electrode and extends toward the bottom of the metal shell 2;

[0059] The second tab segment 43 extends from the first tab segment 42 toward the side of the metal shell 2 ;

[0060] The third tab segment 44 extends from the second end of the second tab segment 43 toward the top of the metal shell 2 .

[0061] Specifically, after the first pole lug segment 42 is led out from the positive electrode, it extends toward the bottom of the metal shell 2. This arrangement helps to utilize the large area of ​​the bottom of the shell to support the pole lug, ensure stable current transmission and reduce resistance; the second pole lug segment 43 is led out from the first pole lug segment 42 and extends toward the side of the metal shell 2. This layout helps to disperse the current and avoid local overheating and energy loss; the third pole lug segment 44 is led out from the second end of the second pole lug segment 43 and extends toward the top of the metal shell 2. This design helps to further optimize the current path and improve the overall energy utilization of the battery; the positive pole lug 4 provided in this application can achieve a multi-point contact design (bottom, side, top) with the metal shell 2, which is beneficial to significantly improve the structural stability and current transmission efficiency of the zinc-nickel battery.

[0062] In one embodiment, the battery electrode group 1 further includes a separator and an electrolyte. The positive electrode, the negative electrode, and the separator are wound to form the battery electrode group 1, and the electrolyte is injected into the metal shell 2.

[0063] An insulating film layer 3 is provided between the battery electrode group 1 and the metal shell 2, and the insulating film layer 3 covers the battery electrode group 1;

[0064] The first pole tab segment 42 is disposed through the insulating film layer 3 , and one end of the first pole tab segment 42 for connecting to the second pole tab segment 43 is located between the insulating film layer 3 and the bottom of the metal shell 2 .

[0065] Specifically, since the present application provides an insulating film layer 3 to cover the battery electrode group 1 , it is beneficial to improve or avoid side reactions caused by direct contact between the negative electrode of the zinc-nickel battery and the metal shell 2 .

[0066] Specifically, in the present application, the negative electrode is led out with a negative electrode ear 5, which extends to a position away from the negative electrode for the purpose of drawing current. In addition, the negative electrode ear 5 continues to extend to a position away from the negative electrode after being led out from the negative electrode, so as to contact other components inside the zinc-nickel battery, conduct current and transmit, and form a stable electrical connection.

[0067] Specifically, the diaphragm can be an existing conventional diaphragm, which can be a ceramic diaphragm, a polymer diaphragm, a non-woven fabric, an inorganic-organic composite diaphragm, etc., including but not limited to single-layer PP (polypropylene), single-layer PE (polyethylene), double-layer PP / PE, double-layer PP / PP and triple-layer PP / PE / PP diaphragms.

[0068] In one embodiment, the nickel-zinc battery further includes a cap 6;

[0069] The metal shell 2 is a semi-enclosed shell with an opening, and the cap 6 closes the opening of the metal shell 2;

[0070] The cap 6 is insulated and connected to the metal shell 2;

[0071] The negative electrode is led out with a negative electrode tab 5 , which extends to the cap 6 and is electrically connected to the cap 6 .

[0072] Specifically, the cap 6 and the metal shell 2 are connected by welding to improve the connection strength between the cap 6 and the metal shell 2, thereby enhancing the overall structural stability of the battery; specific welding processes include laser welding or ultrasonic welding.

[0073] The cap 6 is a component of the battery. Its working principle is that when the battery reaches a certain temperature, its internal structure changes and its resistance increases significantly, thereby preventing the battery from discharging. It has the function of protecting the battery in the event of an external short circuit, and can ensure the safety of battery use. That is, the cap 6 has the characteristics of preventing overvoltage, explosion and overcurrent.

[0074] Specifically, the cap 6 closes the opening of the metal shell 2, completing the overall packaging of the zinc-nickel battery and providing safety protection for the zinc-nickel battery.

[0075] In one embodiment, the metal shell 2 is made of aluminum and its alloys, iron and its alloys, or copper and its alloys.

[0076] In one embodiment, the insulating film layer 3 is made of PP, PE or polyimide.

[0077] Specifically, the purpose of providing the insulating film layer 3 is to isolate the direct contact between the battery electrode group 1 and the metal shell 2 of the zinc-nickel battery, which can provide a good insulation effect. In addition to the above-mentioned insulating materials, the insulating film layer 3 can also be made of other materials with insulating effects, which are not specifically limited.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A zinc-nickel battery, characterized in that: Comprising a battery electrode group (1), a metal shell (2), and an electrolyte, wherein the battery electrode group (1) is accommodated in the metal shell (2); The battery electrode group (1) comprises a positive electrode, a negative electrode and a separator, wherein the separator is spaced between the positive electrode and the negative electrode; An insulating film layer (3) is provided between the battery electrode group (1) and the metal shell (2), and the insulating film layer (3) covers the battery electrode group (1); The electrolyte is injected into the inner side of the insulating film layer (3); the positive electrode is led out with a positive electrode ear (4), the free end of the positive electrode ear (4) passes through the outside of the insulating film layer (3), and contacts and is electrically connected to the inner surface of the metal shell (2).

2. A zinc-nickel battery according to claim 1, characterized in that: The positive electrode tab (4) comprises a first tab segment (42), a second tab segment (43), and a third tab segment (44) connected in sequence; The first pole tab segment (42) is connected to the positive electrode, and the first pole tab segment (42) is provided through the insulating film layer (3); One end of the first pole lug segment (42) and the second pole lug segment (43) are located between the insulating film layer (3) and the bottom of the metal shell (2); the first end of the second pole lug segment (43) is connected to the end of the first pole lug segment (42) that passes through the insulating film layer (3), and one side of the second pole lug segment (43) is in contact with and electrically connected to the bottom of the metal shell (2); The third pole lug segment (44) is located between the insulating film layer (3) and the side of the metal shell (2); one end of the third pole lug segment (44) is connected to the second end of the second pole lug segment (43); and one side of the third pole lug segment (44) is in contact with and electrically connected to the side of the metal shell (2).

3. A zinc-nickel battery according to claim 2, characterized in that: A plurality of reinforcing protrusions (41) are provided on the positive electrode tab (4), and the plurality of reinforcing protrusions (41) are in contact with and electrically connected to the metal shell (2).

4. A zinc-nickel battery according to claim 3, characterized in that: The second pole lug segment (43) and the third pole lug segment (44) are both provided with the reinforcement protrusion (41).

5. A zinc-nickel battery according to claim 3, characterized in that: The plurality of reinforcing protrusions (41) are distributed at intervals on the surface of the positive electrode tab (4).

6. A zinc-nickel battery according to claim 3, characterized in that: The cross section of the reinforcement protrusion (41) is triangular or rectangular.

7. A zinc-nickel battery according to claim 2, characterized in that: The first pole lug segment (42) is led out from the positive electrode and extends toward the bottom of the metal shell (2); The second pole lug segment (43) extends from the first pole lug segment (42) toward a side of the metal shell (2); The third pole lug segment (44) extends from the second end of the second pole lug segment (43) toward the top of the metal shell (2).

8. The nickel-zinc battery according to claim 1, characterized in that: The positive electrode, the negative electrode and the separator are wound to form the battery electrode group (1).

9. The nickel-zinc battery according to claim 1, characterized in that: The nickel-zinc battery further includes a cap (6); The metal shell (2) is a semi-enclosed shell having an opening, and the cover cap (6) closes the opening of the metal shell (2); The cap (6) is insulated and connected to the metal shell (2); The negative electrode is led out with a negative electrode ear (5), and the negative electrode ear (5) extends to the cap (6) and is electrically connected to the cap (6).

10. The nickel-zinc battery according to claim 1, characterized in that: The material of the metal shell (2) is aluminum, aluminum alloy, iron, iron alloy, copper or copper alloy; The insulating film layer (3) is made of PP material, PE material or polyimide material.

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