Expansion early warning device for sodium or lithium ion soft package battery

Abstract

The utility model provides a sodium or lithium ion soft package battery flatulence early warning device, which comprises a soft package clamp and an early warning mechanism, and is characterized in that after a sodium or lithium ion soft package battery to be detected is flatulent, a bulge is generated in the middle area of the battery, so that a conductive metal sheet arranged in the middle area is contacted with a corresponding conductive metal sheet arranged on a clamping plate, and the battery is clamped by the soft package clamp. And the early warning unit gives out an early warning prompt, so that a tester can end the charging and discharging process of the sodium or lithium ion soft package battery in time, and the disaster of explosion and fire caused by battery inflation is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery detection technical field, concretely relates to a sodium or lithium ion soft package battery gas swelling early warning device. BACKGROUND

[0002] With the development of new energy vehicles, smart grids, smart phones and smart home appliances, the demand for energy storage devices has become increasingly urgent. Sodium / lithium ion batteries with energy storage function can provide stable voltage and current and continuous power supply, showing great application potential.

[0003] Sodium / lithium ion batteries can be divided into three types according to their packaging methods and shapes: soft package, square and cylindrical sodium / lithium ion batteries. Among them, soft package batteries are favored for their lightness, portability, high energy density, excellent heat dissipation performance and more flexible design freedom. Although soft package batteries are widely used in various application scenarios, their structural strength is low and their adaptability to internal swelling is low, so if soft package batteries have swelling problems, it will cause safety hazards such as explosion and fire.

[0004] Therefore, the swelling performance of soft package batteries must be tested before leaving the factory, but the current soft package battery testing with clamps cannot timely detect the swelling of soft package batteries, which will cause serious explosion and fire safety hazards.

[0005] The patent application with publication number CN113823857A provides a battery, an outer film covering the battery body is provided with a gas chamber at one end, the gas chamber is used to contain the gas generated by the battery body and deforms along the deformation direction based on the volume of the contained gas. The patent application also provides a device and method for detecting the battery, which can detect the deformation of the gas chamber to monitor the swelling of the battery, improve safety, and the device has low cost and small size, suitable for small devices such as mobile or portable devices. However, for conventional soft package batteries, no special gas chamber is provided, but the swelling of soft package batteries still needs to be detected. UTILITY MODEL CONTENTS

[0006] In view of the above problems, the utility model provides a sodium or lithium ion soft package battery gas swelling early warning device. This device can issue an early warning in time after the battery swells, and the tester can end the charging and discharging process of the sodium or lithium ion soft package battery in time to avoid the disaster of explosion and fire caused by battery swelling.

[0007] The utility model provides a kind of sodium or lithium ion soft package battery gas swelling early warning device, the sodium or lithium ion soft package battery includes soft package battery ontology, the opposite two side surfaces of soft package battery ontology all have battery tab main body area and battery tab welding area, the battery tab main body area is the area that the active material layer is coated on the opposite two side surfaces of battery lamination, and the intermediate region is spaced between battery tab welding area and battery tab main body area, the intermediate region is recessed relative to battery tab main body area to the inside of soft package battery ontology.The sodium or lithium ion soft package battery gas swelling early warning device includes:

[0008] Soft package clamp includes a pair of clamping plate, clamping plate is divided into upper clamping plate and lower clamping plate, for clamping and fixing the sodium or lithium ion soft package battery to be measured, two clamping plates are respectively clamped the two side surfaces of the battery tab main body area on soft package battery ontology;

[0009] Early warning mechanism includes early warning unit and conductive metal sheet, the conductive metal sheet includes two pairs, and the two pieces in each pair of conductive metal sheet are respectively arranged on the intermediate region of the side surface of soft package battery ontology and the clamping plate on the opposite side of the intermediate region;The two pieces of each pair of conductive metal sheet are respectively connected using wire with the two ends of early warning unit, and the two pairs of conductive metal sheet are connected in parallel;

[0010] Early warning detection, there is gap between the two pieces in each pair of conductive metal sheet in initial state, the sodium or lithium ion soft package battery to be measured is carried out charge-discharge cycle test, when the sodium or lithium ion soft package battery to be measured occurs gas swelling, the intermediate region produces bulge, so that the conductive metal sheet arranged in the intermediate region contacts the corresponding conductive metal sheet arranged on the clamping plate, so that the circuit is conducted, and early warning unit issues early warning prompt.

[0011] Further, the clamping plate includes metal plate layer and insulating layer, and the insulating layer is located on one side for clamping soft package battery ontology. Among them, the metal plate layer can be stainless steel plate or aluminum alloy plate. The metal plate layer has good hardness, which can ensure that the clamping surface remains flat when clamping and fixing the soft package battery. And the setting of the insulating layer can ensure the guidance of the detection circuit and ensure the detection accuracy.

[0012] Further, the insulating layer is an epoxy resin coating layer, which is obtained by coating epoxy resin on the surface of the metal plate layer and curing it. The coating method includes roll coating, spraying, electrophoretic coating and dipping and pulling.

[0013] Further, the upper clamping plate and the lower clamping plate are clamped and fixed by screws or bolts. The upper clamping plate and the lower clamping plate can be relatively provided with fixing holes, a bolt is used to pass through the fixing holes on the upper clamping plate and the lower clamping plate, and then the head of the bolt is matched with a fixing nut, so that the upper clamping plate and the lower clamping plate are fixed by cooperation of the bolt and the fixing nut. Alternatively, the fixing holes on one of the upper clamping plate and the lower clamping plate are provided as threaded holes, so that the upper clamping plate and the lower clamping plate can be directly fixed by screws or bolts without the need of additionally matching the fixing nut.

[0014] Further, the early warning unit comprises an alarm and an external power supply, one of each pair of the conductive metal sheets is connected with the alarm, and the other is connected with the external power supply, and the alarm and the external power supply are connected by wires. The external power supply is used to supply power to the alarm when the detection circuit is turned on. The alarm can emit light alarm or sound alarm after being powered on, for reminding the staff.

[0015] Further, the gap width between the two conductive metal sheets in each pair is 1.35-4.00mm in the initial state.

[0016] Further, the conductive metal sheets can be copper sheets or aluminum sheets, and the wires can be copper wires or aluminum wires.

[0017] Further, the conductive metal sheets are pasted to the middle area or the clamping plate by an adhesive. For example, double-sided tape can be used for pasting.

[0018] The sodium or lithium ion soft package battery gas swelling early warning device has the advantages that the sodium or lithium ion soft package battery gas swelling early warning device can timely issue a warning for abnormal gas production of the battery during the charge-discharge test of the soft package battery, prompt the tester to timely end the charge-discharge process of the sodium or lithium ion battery, and avoid the disaster of battery gas swelling explosion and fire. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic view of the sodium or lithium ion soft package battery gas swelling early warning device.

[0020] Figure 2 It is a structural schematic view of the conductive metal copper sheet pasted on the soft package battery to be tested.

[0021] The drawings are as follows: soft package clamp 1, insulating layer 1-1, bolt 1-2, metal plate layer 1-3, fixing hole 1-4,

[0022] Soft package battery body 2, middle area 2-1, battery tab main area 2-2, battery tab welding area 2-3,

[0023] Early warning mechanism 3, wire 3-1, alarm 3-2, external power supply 3-3, conductive metal sheet 3-4, conductive metal sheet 3-5. DETAILED DESCRIPTION

[0024] As Figures 1-2 shown, the utility model provides a kind of sodium or lithium ion soft package battery gas swelling early warning device, which is used to detect the gas swelling condition of sodium or lithium ion soft package battery.

[0025] Sodium or lithium ion soft package battery includes soft package battery body 2, soft package battery body 2 includes the middle region 2-1 located at the opposite two side surfaces of soft package battery body 2, battery tab main body region 2-2 coated with active material layer and battery tab welding area 2-3, middle region 2-1 is located between battery tab main body region 2-2 and battery tab welding area 2-3, and middle region 2-1 is recessed to the inside of soft package battery body 2 relative to battery tab main body region 2-2.

[0026] The utility model sodium or lithium ion soft package battery gas swelling early warning device includes soft package clamp 1 and early warning mechanism 3.

[0027] Soft package clamp 1 includes a pair of clamping plates. Clamping plate is divided into upper clamping plate and lower clamping plate, and is used to clamp and fix the sodium or lithium ion soft package battery to be measured, and two clamping plates clamp the two side surfaces of soft package battery body having battery tab main body region respectively.

[0028] Clamping plate includes metal plate layer 1-3 and insulating layer 1-1. Insulating layer 1-1 is located on the side for clamping soft package battery body 2. Among them, metal plate layer 1-3 can be stainless steel plate or aluminum alloy plate. Metal plate layer 1-3 has good hardness, which can ensure that the clamping surface remains flat when clamping and fixing soft package battery. Insulating layer 1-1 is epoxy resin coating, and the setting of insulating layer 1-1 can ensure the guidance of detection circuit and ensure accurate detection.

[0029] Upper clamping plate and lower clamping plate are clamped and fixed by screw or bolt. Upper clamping plate and lower clamping plate can be provided with fixed hole 1-4 oppositely, bolt 1-2 is used to pass through fixed hole 1-4 on upper clamping plate and lower clamping plate, then one end of bolt 1-2 is matched with fixed nut, and upper clamping plate and lower clamping plate are fixed between bolt 1-2 and fixed nut (the fixing mode in the embodiment in the description). The fixed hole of one of upper clamping plate or lower clamping plate can also be set as threaded hole, so that screw or bolt can be directly used for fixing, without additional fixed nut. Figure 1

[0030] ​The early warning mechanism 3 comprises an early warning unit and conductive metal sheets. The conductive metal sheets comprise two pairs, two conductive metal sheets 3-4 in the two pairs are arranged on the middle region 2-1 of one side surface of the soft package battery body 2, and the other two conductive metal sheets 3-5 in the two pairs are arranged on the clamping plates on the opposite side of the middle region 2-1. The two conductive metal sheets in each pair are respectively connected to two ends of the early warning unit by using wires 3-1, and the two pairs of conductive metal sheets are connected in parallel.

[0031] The wires 3-1 can be copper wires or aluminum wires. The conductive metal sheets can be copper sheets or aluminum sheets, and the conductive metal sheets are pasted on the middle region 2-1 or the clamping plates by using an adhesive, for example, double-sided tape.

[0032] The early warning unit comprises an alarm 3-2 and an external power supply 3-3. One of the two conductive metal sheets in each pair is connected to the alarm 3-2 by using the wires 3-1, and the other one is connected to the external power supply 3-3 by using the wires 3-1. The alarm 3-2 and the external power supply 3-3 are connected by using the wires 3-1.

[0033] The external power supply 3-3 is used to supply power to the alarm when the detection circuit is turned on, for example, a button cell can be used; the alarm 3-2 can emit a light alarm or a sound alarm after being powered on, which is used to remind the staff.

[0034] During early warning detection, in the initial state, since the middle region 2-1 of the soft package battery body 2 is in a flat state, the conductive metal sheet 3-5 pasted on the middle region 2-1 and the conductive metal sheet 3-4 pasted on the clamping plate do not contact each other, and the gap width between them is 1.35-4.00 mm. When the soft package battery is subjected to a charge-discharge cycle test, when the soft package battery is inflated, the soft package battery body 2 fixed by the soft package clamp 1 first bulges in the middle region 2-1, so that the conductive metal sheet 3-5 pasted on the middle region 2-1 contacts the corresponding conductive metal sheet 3-4 pasted on the clamping plate, causing the circuit of the early warning mechanism 3 to be connected, thereby causing the alarm 3-2 to issue a warning prompt. The tester can end the charge-discharge process of the soft package battery in time after obtaining the alarm information, so as to avoid the disaster of explosion and fire caused by battery inflation.

[0035] The operation steps during the test are as follows:

[0036] (1) Two conductive metal sheets 3-5 are pasted on the front and back surfaces of the middle region 2-1 respectively, and two conductive metal sheets 3-4 are pasted on the insulating layer 1-1 of the clamping plate corresponding to the conductive metal sheet 3-5 on the middle region 2-1;

[0037] (2) The soft package battery with the conductive metal sheet 3-5 is placed between the clamping plates, and is clamped and fixed by using screws or bolts 1-2;

[0038] (3) One of the conductive metal sheets of each pair is connected to the alarm 3-2 using the wire 3-1, and the other is connected to the external power supply 3-3 using the wire 3-1, and the alarm 3-2 and the external power supply 3-3 are connected using the wire 3-1;

[0039] (4) Place the soft package battery on the test cabinet for charge and discharge cycle test, when the soft package battery inflates during the charge and discharge process, the alarm 3-2 gives a pre-warning prompt.

Claims

1. A sodium or lithium ion soft package battery gas swelling early warning device, the sodium or lithium ion soft package battery comprising a soft package battery body, the opposite two side surfaces of the soft package battery body each having a battery pole piece main body area and a battery tab welding area, an intermediate area being provided between the battery tab welding area and the battery pole piece main body area, the intermediate area being recessed inwardly of the soft package battery body relative to the battery pole piece main body area, characterized in that, The sodium or lithium ion soft package battery gas warning device comprises: A soft package clamp comprising a pair of clamping plates, the clamping plates being divided into upper and lower clamping plates, for clamping and fixing the sodium or lithium ion soft package battery to be measured, the two clamping plates clamping the two side surfaces of the soft package battery body having the battery tab main area respectively; A warning mechanism comprising a warning unit and conductive metal sheets, the conductive metal sheets comprising two pairs, two pieces of each pair of conductive metal sheets being arranged on the clamping plate on the opposite side of the middle area of the side surface of the soft package battery body respectively; During the warning detection, the two pieces of each pair of conductive metal sheets have a gap in the initial state, the sodium or lithium ion soft package battery to be measured is subjected to the charge and discharge cycle test, when the sodium or lithium ion soft package battery to be measured abnormally expands, the middle area expands to make the conductive metal sheet arranged on the middle area contact the corresponding conductive metal sheet arranged on the clamping plate, so as to make the circuit conductive, and the warning unit issues a warning prompt.

2. The sodium or lithium ion soft pack battery gas swelling early warning device according to claim 1, characterized in that, The clamping plate comprises a metal plate layer and an insulating layer, and the insulating layer is arranged on the side for clamping the soft package battery body.

3. The sodium or lithium ion soft pack battery gas swelling early warning device according to claim 2, characterized in that, The insulating layer is an epoxy resin coating.

4. The sodium or lithium ion soft pack battery gas swelling early warning device according to claim 1, characterized in that, The upper and lower clamping plates are clamped and fixed by screws or bolts.

5. The sodium or lithium ion soft pack battery gas swelling early warning device according to claim 1, characterized in that, The warning unit comprises an alarm and an external power supply, one piece of each pair of conductive metal sheets is connected with the alarm, and the other piece is connected with the external power supply, and the alarm and the external power supply are connected by wires.

6. The sodium or lithium ion soft pack battery gas swelling early warning device according to claim 1, characterized in that, The gap width between the two pieces of each pair of conductive metal sheets in the initial state is 1.35-4.00 mm.

7. The sodium or lithium ion soft pack battery gas swelling early warning device according to claim 1, characterized in that, The conductive metal sheets are pasted on the middle area or the clamping plate by an adhesive.

Images