High-temperature-resistant low-impedance battery

Abstract

The utility model provides a high-temperature-resistant low-impedance battery and relates to the technical field of batteries. The negative electrode material is used for solving the technical problems that the conventional negative electrode material and formula used by the existing battery are easy to pulverize in the later stage of high-temperature circulation, the discharge performance of the battery is poor, and the service life is short. The high-temperature-resistant low-impedance battery comprises a steel shell, a positive current collector is arranged in the steel shell, a positive connecting piece is mounted on the positive current collector, a convex ring is fixedly connected in the steel shell, a connecting plate is mounted on the convex ring, the positive connecting piece is connected with the connecting plate, a positive column is mounted on the connecting plate, a negative current collector is arranged in the steel shell, and a negative column is mounted on the negative current collector. A clamping groove is formed in the steel shell, a negative electrode end is arranged in the clamping groove, and the negative electrode connecting piece is connected with the negative electrode end. The rare metal element yttrium in the negative plate can improve pulverization of negative electrode powder in the later period of charging and discharging in a high-temperature environment, reduce increase of internal resistance of the battery, improve discharging performance and achieve the effect of prolonging the service life of the battery.

Description

Technical Field

[0001] The utility model provides a high temperature resistant and low impedance battery, and relates to the technical field of batteries. Background Art

[0002] Nickel-hydrogen battery is a kind of storage battery with good performance. Nickel-hydrogen battery is divided into high-voltage nickel-hydrogen battery and low-voltage nickel-hydrogen battery. The positive active material of nickel-hydrogen battery is Ni(OH)2 (called NiO electrode), the negative active material is metal hydride, also called hydrogen storage alloy (the electrode is called hydrogen storage electrode), and the electrolyte is potassium hydroxide solution. Nickel-hydrogen battery is an important direction of hydrogen energy application and is attracting more and more attention.

[0003] The current high-temperature battery is widely used in an ambient temperature of 50°C, with a service life of about 4 years. There is a new demand in the market, and the service life needs to be extended to 6 years. The conventional negative electrode materials and formulations used in existing batteries are prone to powderization in the later stage of high-temperature cycling, and the internal resistance increases, resulting in poor battery discharge performance and a greatly reduced service life.

[0004] Therefore, it is necessary to provide a high temperature resistant and low impedance battery with a long service life. Utility Model Content

[0005] In order to overcome the shortcomings of conventional negative electrode materials and formulations used in existing batteries that are easily pulverized in the later stage of high-temperature cycles, which easily lead to poor battery discharge performance and short service life, the utility model provides a high-temperature resistant and low-impedance battery with a long service life.

[0006] In order to achieve the above-mentioned purpose, the embodiment of the utility model provides the following technical solutions: a high temperature resistant and low impedance battery, comprising a steel shell, a positive current collector, a positive connecting sheet, a connecting plate, a convex ring, a positive column, a negative current collector, a negative connecting sheet and a negative terminal, a positive current collector is arranged in the steel shell, a positive connecting sheet is installed on the positive current collector, a convex ring is fixed in the steel shell, a connecting plate is installed on the convex ring, the positive connecting sheet is connected to the connecting plate, a positive column is installed on the connecting plate, a negative current collector is arranged in the steel shell, a negative connecting sheet is installed on the negative current collector, a card slot is opened in the steel shell, a negative terminal is arranged in the card slot, the negative connecting sheet is connected to the negative terminal, and also includes a winding core and a heat insulation film, a heat insulation film is arranged in the steel shell, a winding core is arranged between the positive current collector and the negative current collector, the winding core is composed of a positive electrode sheet, a diaphragm and a negative electrode sheet, a diaphragm is arranged between the positive electrode sheet and the negative electrode sheet, and the positive electrode sheet and the negative electrode sheet are separated by the diaphragm.

[0007] In one embodiment, the negative electrode sheet is composed of hydrogen storage alloy powder containing the rare metal element yttrium.

[0008] In one embodiment, the thickness of the membrane is 25-40 um, and micropores are formed on the surface of the membrane.

[0009] In one embodiment, rolling grooves are formed on the steel shell.

[0010] In one embodiment, a plurality of positive electrode contact points are arranged on the positive electrode current collecting sheet, and the positive electrode contact points are in contact with the positive electrode sheet. A plurality of negative electrode contact points are arranged on the negative electrode current collecting sheet, and the negative electrode contact points are in contact with the negative electrode sheet.

[0011] In one of the embodiments, it also includes a positive electrode cap installed in the steel shell, and the positive electrode cap is wrapped around the positive electrode column.

[0012] In one of the embodiments, it further includes a plurality of through holes formed on the connecting plate, and a plurality of air outlet channels formed on the positive electrode cap.

[0013] In one embodiment, the diameter of the through hole is 10-20 um.

[0014] In one of the embodiments, an insulating film is provided on the steel shell.

[0015] Compared with the prior art, the battery provided by the embodiment of the utility model has the following advantages: 1. The rare metal element yttrium in the negative electrode sheet can improve the pulverization of the negative electrode powder in the later stage of charging and discharging in a high temperature environment, reduce the increase in the internal resistance of the battery, improve the discharge performance, and achieve the effect of extending the service life of the battery.

[0016] 2. The oxidizing gas generated by the positive and negative electrodes of the battery is discharged outward through the through holes on the connecting plate and the vent holes on the positive electrode cap to prevent the gas from accumulating in the steel shell and causing the battery to expand, thereby achieving the effect of releasing the gas inside the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0018] Figure 2 It is a schematic diagram of the three-dimensional explosion structure of the utility model.

[0019] Figure 3 The utility model is a three-dimensional cross-sectional structural schematic diagram of the steel shell, the positive pole column and the positive pole cap.

[0020] Figure 4 It is a schematic diagram of the three-dimensional cross-sectional structure of the positive electrode sheet, the diaphragm and the negative electrode sheet of the utility model.

[0021] Markings in the accompanying drawings: 1: steel shell, 101: rolling groove, 102: card slot, 2: winding core, 201: positive electrode sheet, 202: diaphragm, 203: negative electrode sheet, 3: thermal insulation film, 4: positive electrode current collector, 401: positive electrode contact point, 5: positive electrode connecting piece, 6: connecting plate, 601: through hole, 7: convex ring, 8: positive electrode column, 9: positive electrode cap, 901: air outlet channel, 10: negative electrode current collector, 1001: negative electrode contact point, 11: negative electrode connecting piece, 12: negative terminal, 13: insulating film. DETAILED DESCRIPTION

[0022] The embodiments of the present invention will be described below with reference to the accompanying drawings.

[0023] Example 1: A high temperature resistant low impedance battery, see Figure 1-Figure 4 As shown, it includes a steel shell 1, a positive current collector 4, a positive connecting piece 5, a connecting plate 6, a convex ring 7, a positive column 8, a negative current collector 10, a negative connecting piece 11 and a negative terminal 12. The positive current collector 4 is arranged on the upper inner part of the steel shell 1, and the positive connecting piece 5 is installed on the top of the positive current collector 4 by welding. A rolling groove 101 is opened on the upper outer part of the steel shell 1, and a convex ring 7 is fixedly connected to the upper inner part of the steel shell 1 by welding. The connecting plate 6 is installed on the upper part of the convex ring 7 by welding. The plate 6 is located above the positive electrode connecting piece 5, the positive electrode connecting piece 5 is connected to the connecting plate 6, the positive electrode column 8 is installed on the top of the connecting plate 6 by welding, the negative electrode current collecting piece 10 is arranged at the lower inner part of the steel shell 1, the negative electrode connecting piece 11 is installed at the bottom of the negative electrode current collecting piece 10 by welding, the lower inner part of the steel shell 1 is provided with a card slot 102, the card slot 102 is provided with a negative terminal 12, the negative terminal 12 is located below the negative electrode connecting piece 11, the negative electrode connecting piece 11 is connected to the negative terminal 12, and the positive current collecting piece The bottom of the steel shell 1 is provided with a plurality of positive contact points 401, which are in contact with the positive electrode sheet 201, and the top of the negative current collector sheet 10 is provided with a plurality of negative contact points 1001, which are in contact with the negative electrode sheet 203. The positive contact points 401 and the negative contact points 1001 are used to converge the positive and negative currents without affecting each other. The steel shell 1 also includes a winding core 2 and a heat insulation film 3. The inner side of the steel shell 1 is provided with a heat insulation film 3 for isolating the heat inside and outside the battery. The positive current collector sheet 4 and the negative current collector sheet 10 are provided with a plurality of negative contact points 1001, which are in contact with the negative electrode sheet 203. The positive contact points 401 and the negative contact points 1001 are used to converge the positive and negative currents without affecting each other. A winding core 2 is commonly arranged between the flow sheets 10, and the winding core 2 is composed of a positive electrode sheet 201, a diaphragm 202 and a negative electrode sheet 203. The negative electrode sheet 203 is composed of hydrogen storage alloy powder containing rare metal element yttrium, which is used to alleviate the pulverization of the negative electrode and extend the service life of the battery. A diaphragm 202 is arranged between the positive electrode sheet 201 and the negative electrode sheet 203, and the positive electrode sheet 201 and the negative electrode sheet 203 are separated by the diaphragm 202. The thickness of the diaphragm 202 is 25-40um, and micropores are opened on the surface of the diaphragm 202.

[0024] When the battery is in use, the positive electrode sheet 201 transfers electric energy to the positive current collecting sheet 4 through the positive contact point 401, the current is guided and converged on the positive connecting sheet 5, and is transferred to the positive electrode column 8 through the connecting plate 6. The electric energy is conducted from the positive electrode column 8 to the electrical appliance in contact with the positive electrode cap 9, and the electric energy flows back through the negative terminal 12, and enters the negative electrode sheet 203 in turn through the negative connecting sheet 11 and the negative current collecting sheet 10; the rare metal element yttrium in the negative electrode sheet 203 can improve the pulverization of the negative electrode powder in the later stage of charging and discharging in a high temperature environment, reduce the increase in the internal resistance of the battery, improve the discharge performance, and extend the battery life. The heat can be blocked by the thermal insulation film 3, making the battery more resistant to high temperatures.

[0025] Example 2: Based on Example 1, refer to Figure 3 and Figure 4 As shown, it also includes a positive electrode cap 9 installed on the top of the steel shell 1 by welding, and the positive electrode cap 9 is wrapped on the positive electrode column 8; it also includes a plurality of through holes 601 opened on the connecting plate 6, the aperture of the through holes 601 is 10-20um, and the positive electrode cap 9 is provided with four outlet channels 901 for discharging oxidizing gas.

[0026] When the substances in the positive electrode sheet 201 and the negative electrode sheet 203 generate oxidizing gas, the gas is transmitted upward through the through hole 601 on the connecting plate 6 and discharged outward through the gas outlet channel 901 on the positive electrode cap 9 to prevent the gas from accumulating in the steel shell 1 and causing the battery to expand.

[0027] See also Figure 3 As shown, the outer cover of the steel shell 1 is provided with an insulating film 13. The insulating film 13 can reduce the current from self-discharging directly outward through the steel shell 1, so as to avoid power loss and shorten the service life, and at the same time, it can prevent the battery from hurting others when self-discharging.

[0028] 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 solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A high temperature resistant low impedance battery, comprising a steel shell (1), a positive current collector (4), a positive connecting piece (5), a connecting plate (6), a convex ring (7), a positive pole (8), a negative current collector (10), a negative connecting piece (11) and a negative terminal (12), wherein the positive current collector (4) is arranged in the steel shell (1), the positive connecting piece (5) is mounted on the positive current collector (4), the convex ring (7) is fixedly connected in the steel shell (1), and the convex ring (7) is mounted on the positive current collector (4). A connecting plate (6) is installed, a positive electrode connecting piece (5) is connected to the connecting plate (6), a positive electrode column (8) is installed on the connecting plate (6), a negative electrode current collecting piece (10) is arranged in the steel shell (1), a negative electrode connecting piece (11) is installed on the negative electrode current collecting piece (10), a slot (102) is opened in the steel shell (1), a negative terminal (12) is arranged in the slot (102), and the negative electrode connecting piece (11) is connected to the negative terminal (12), and the characteristics are: The invention also comprises a winding core (2) and a heat-insulating film (3). The heat-insulating film (3) is arranged in the steel shell (1). The winding core (2) is arranged between the positive electrode current collecting sheet (4) and the negative electrode current collecting sheet (10). The winding core (2) is composed of a positive electrode sheet (201), a diaphragm (202) and a negative electrode sheet (203). The diaphragm (202) is arranged between the positive electrode sheet (201) and the negative electrode sheet (203). The positive electrode sheet (201) and the negative electrode sheet (203) are separated by the diaphragm (202).

2. A high temperature resistant low impedance battery according to claim 1, characterized in that: The negative electrode sheet (203) is composed of hydrogen storage alloy powder containing the rare metal element yttrium.

3. A high temperature resistant low impedance battery according to claim 1, characterized in that: The thickness of the diaphragm (202) is 25-40 um, and micropores are provided on the surface of the diaphragm (202).

4. The high temperature resistant low impedance battery according to claim 1, characterized in that: A rolling groove (101) is provided on the steel shell (1).

5. The high temperature resistant low impedance battery according to claim 1, characterized in that: A plurality of positive electrode contact points (401) are arranged on the positive electrode current collecting sheet (4), and the positive electrode contact points (401) are in contact with the positive electrode sheet (201); a plurality of negative electrode contact points (1001) are arranged on the negative electrode current collecting sheet (10), and the negative electrode contact points (1001) are in contact with the negative electrode sheet (203).

6. A high temperature resistant low impedance battery according to claim 1, characterized in that: It also includes a positive electrode cap (9) installed in the steel shell (1), and the positive electrode cap (9) is wrapped around the positive electrode column (8).

7. A high temperature resistant low impedance battery according to claim 6, characterized in that: It also includes a plurality of through holes (601) formed on the connecting plate (6), and a plurality of air outlet channels (901) formed on the positive electrode cap (9).

8. A high temperature resistant low impedance battery according to claim 7, characterized in that: The aperture of the through hole (601) is 10-20 um.

9. The high temperature resistant low impedance battery according to claim 1, characterized in that: An insulating film (13) is sleeved on the steel shell (1).

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