Lithium manganate battery low-temperature charging and heating control system for starting special vehicle

Abstract

The invention relates to a low-temperature charging and heating control system for a lithium manganate battery for starting a special vehicle. The problems that an existing heating method is low in efficiency, large in implementation difficulty and insufficient in space are solved. Comprising a charging loop relay (1), a heating loop relay (2), a temperature sensor (3), a battery management system (4), a battery pack heating belt (5), a starting lithium manganate battery pack (6), a starting lithium manganate battery charging external power supply (7), a starting lithium manganate battery positive electrode (8), a starting lithium manganate battery negative electrode (9) and a heating control loop and a charging control loop which are formed by related connecting wire harnesses. The battery management system is added, so that the functions of information management, charging control, low-temperature heating and the like in the battery can be realized; the temperature and voltage conditions are judged in real time by using the temperature sensor, so that the on-off of a related relay loop can be timely and accurately controlled, and the effective protection of the battery is realized; the temperature of the battery cell is rapidly increased, and the rapid charging purpose is achieved.

Description

Technical Field

[0001] The invention relates to a charging and heating control system, in particular to a low-temperature charging and heating control system for a lithium manganate battery used for starting a special vehicle. Background Art

[0002] Existing special vehicle chassis have gradually begun to use lithium manganese oxide batteries as starting power sources in large quantities. At room temperature, this battery has the characteristics of light weight, high energy density, and strong discharge capacity. In particular, it can perform deep discharge, which can effectively meet the power needs of the entire vehicle and its upper equipment.

[0003] When the starting lithium manganese oxide battery is at an ambient temperature below 0°C, using a mains charger or a vehicle-mounted generator to charge the battery will cause lithium manganese oxide metal to precipitate. This is because the lithium manganese oxide embedding impedance of the graphite negative electrode at low temperatures is significantly greater than the lithium manganese oxide de-embedding impedance of the positive electrode. Although lithium manganese oxide ions can be de-embedded from the positive electrode relatively quickly at low temperatures, they cannot be embedded into the negative electrode in time, resulting in lithium manganese oxide precipitation. In severe cases, lithium manganese oxide dendrites may precipitate. After repeated low-temperature cycles, the precipitated metal lithium manganese oxide dendrites may pierce the diaphragm, causing a short circuit inside the battery, thereby affecting safety performance and causing safety issues such as smoking and fire.

[0004] In order to solve the potential safety hazard of low-temperature charging of starting lithium manganese oxide batteries, the industry generally uses a battery box to add an insulation layer or a water jacket circulation heating solution. This type of solution has low heating efficiency and occupies a large space, has many disadvantages, and has certain defects in actual use and implementation. Therefore, it is necessary to complete the design of a heating system inside the starting lithium manganese oxide battery to solve the problems of low heating efficiency, large space and high implementation difficulty. The present invention integrates the heating system inside the battery, and can effectively solve such problems through the control of the battery management system. Summary of the invention

[0005] The present invention focuses on the design of a low-temperature heating system for a starting lithium manganese oxide battery, provides a solution for effectively charging the starting lithium manganese oxide battery in a low-temperature environment, and solves the problems of low efficiency, great implementation difficulty and insufficient space of previous heating methods.

[0006] The present invention is achieved by the following technical solutions:

[0007] A low-temperature charging and heating control system for a lithium manganate battery for starting a special vehicle, comprising a charging circuit relay 1, a heating circuit relay 2, a temperature sensor 3, a battery management system 4, a battery pack heating belt 5, a starting lithium manganate battery pack 6, a starting lithium manganate battery charging external power supply 7, a starting lithium manganate battery positive electrode 8, a starting lithium manganate battery negative electrode 9 and related connecting harnesses, wherein:

[0008] The positive and negative electrodes of the external power source 7 for charging the starting lithium manganese oxide battery are respectively connected to the positive electrode 8 of the starting lithium manganese oxide battery and the negative electrode 9 of the starting lithium manganese oxide battery, the positive electrode 8 of the starting lithium manganese oxide battery is connected to the heating circuit relay 2, the heating circuit relay 2 is respectively connected to the battery management system 4 and the battery pack heating belt 5, the battery management system 4 is connected to the temperature sensor 3, the temperature sensor 3 is connected to the starting lithium manganese oxide battery pack 6, and the negative electrode 9 of the starting lithium manganese oxide battery is respectively connected to the battery pack heating belt 5 and the negative electrode of the starting lithium manganese oxide battery pack 6 to form a heating control circuit;

[0009] The external power source 7 for charging the starting lithium manganese oxide battery is respectively connected to the positive electrode 8 and the negative electrode 9 of the starting lithium manganese oxide battery, the positive electrode 8 of the starting lithium manganese oxide battery is connected to the charging circuit relay 1, the charging circuit relay 1 is respectively connected to the battery management system 4 and the starting lithium manganese oxide battery pack 6, the negative electrode 9 of the starting lithium manganese oxide battery is connected to the negative electrode of the starting lithium manganese oxide battery pack 6 to form a charging control circuit.

[0010] The existing lithium manganese oxide battery for starting does not realize the control of the battery management system, and does not design the internal heating control scheme of the battery pack. Compared with the existing technical scheme, the present invention has the following beneficial effects:

[0011] 1. Adding a battery management system to lithium manganese oxide batteries for starting special vehicles can realize functions such as internal battery information management, charging control, and low-temperature heating;

[0012] 2. The low-temperature charging and heating control system of lithium manganese oxide batteries for starting special vehicles uses a temperature sensor to judge the temperature and voltage conditions in real time, and can accurately control the on and off of the relevant relay circuits in a timely manner to achieve effective protection of the battery;

[0013] 3. The low-temperature charging and heating control system of lithium manganese oxide batteries for starting special vehicles changes the heating scheme to a solution with a heating belt embedded in the battery cell, which enables a rapid increase in the battery cell temperature, thereby achieving the purpose of fast and safe charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is the schematic diagram of the low-temperature charging and heating control system of lithium manganese oxide batteries used for starting special vehicles. DETAILED DESCRIPTION

[0015] The present invention is designed for a low-temperature charging and heating control system of a lithium manganate battery for starting a special vehicle, and is composed of a charging circuit relay 1, a heating circuit relay 2, a temperature sensor 3, a battery management system 4, a battery pack heating belt 5, a starting lithium manganate battery pack 6, an external power supply for charging a starting lithium manganate battery 7, a starting lithium manganate battery positive electrode 8, a starting lithium manganate battery negative electrode 9 and related connecting harnesses.

[0016] Charging circuit relays, heating circuit relays, temperature sensors, battery management systems, battery pack heating belts, starting lithium manganese oxide battery packs, starting lithium manganese oxide battery charging external power supplies, starting lithium manganese oxide battery positive electrodes, starting lithium manganese oxide battery negative electrodes, etc. have been verified on special vehicle chassis and are mature products currently in use.

[0017] The circuit connection relationship of the low-temperature charging and heating control system of lithium manganese oxide batteries for special vehicle starting is described as follows:

[0018] 1) Heating control circuit: the positive and negative electrodes of the external power supply 7 for charging the starting lithium manganese oxide battery are respectively connected to the positive electrode 8 and the negative electrode 9 of the starting lithium manganese oxide battery, the positive electrode 8 of the starting lithium manganese oxide battery is connected to the heating circuit relay 2, the heating circuit relay 2 is respectively connected to the battery management system 4 and the battery pack heating belt 5, the battery management system 4 is connected to the temperature sensor 3, the temperature sensor 3 is connected to the starting lithium manganese oxide battery pack 6, and the negative electrode 9 of the starting lithium manganese oxide battery is respectively connected to the battery pack heating belt 5 and the negative electrode of the starting lithium manganese oxide battery pack 6.

[0019] 2) Charging control circuit: The external power source 7 for charging the starting lithium manganese oxide battery is connected to the positive electrode 8 of the starting lithium manganese oxide battery and the negative electrode 9 of the starting lithium manganese oxide battery respectively. The positive electrode 8 of the starting lithium manganese oxide battery is connected to the charging circuit relay 1. The charging circuit relay 1 is connected to the battery management system 4 and the starting lithium manganese oxide battery pack 6 respectively. The negative electrode 9 of the starting lithium manganese oxide battery is connected to the negative electrode of the starting lithium manganese oxide battery pack 6.

[0020] The working principle of the low-temperature charging and heating control system of lithium manganese oxide batteries for starting special vehicles is described as follows:

[0021] like Figure 1As shown, the external power source 7 for charging the starting lithium manganese oxide battery is connected to the positive electrode 8 and the negative electrode 9 of the starting lithium manganese oxide battery. When the external power source 7 for charging the starting lithium manganese oxide battery starts to supply power, the battery management system 4 detects the terminal voltage of the positive electrode 8 and the negative electrode 9 of the starting lithium manganese oxide battery to determine whether to charge. If the voltage is lower than 13V, the battery management system 4 will detect the temperature in the starting lithium manganese oxide battery pack 6 through the temperature sensor 3. If the temperature is higher than 0°C, the charging circuit relay 1 is controlled to be closed to realize charging of the starting lithium manganese oxide battery pack 6. If the temperature value detected by the temperature sensor 3 and transmitted back to the battery management system 4 is lower than 0°C, the battery management system 4 controls the heating circuit relay 2 to close, and the battery pack heating belt 5 starts to work. When the temperature sensor 3 detects that the temperature inside the starting lithium manganese oxide battery pack 6 is between 0°C and 5°C, the temperature sensor 3 transmits the detection value to the battery management system 4, and the battery management system 4 controls the heating circuit relay 2 to disconnect, and at the same time closes the charging circuit relay 1 to charge the starting lithium manganese oxide battery pack 6. If the battery management system 4 detects that the terminal voltage of the positive electrode 8 and the negative electrode 9 of the starting lithium manganese oxide battery is greater than 13V, the battery management system 4 will not close any relays, and it is determined that the starting lithium manganese oxide battery pack 6 does not need to be charged.

[0022] After special vehicles use lithium manganese oxide batteries for starting, the traditional solution cannot effectively solve the problem of fast charging at low temperatures, which increases the difficulty of successfully starting special vehicles under low temperature conditions, making special vehicles unable to be used normally, thus affecting the execution of various tasks.

[0023] At the same time, since lithium manganese oxide batteries have certain safety risks when charged in a low temperature environment, there will be no risk of fire, smoke or even explosion after using this solution. The safety of special vehicles is effectively guaranteed. Therefore, the present invention has important economic and safety significance.

Claims

1. A low-temperature charging and heating control system for a lithium manganate battery for starting a special vehicle, comprising a charging circuit relay (1), a heating circuit relay (2), a temperature sensor (3), a battery management system (4), a battery pack heating belt (5), a starting lithium manganate battery pack (6), an external power source for charging the starting lithium manganate battery (7), a starting lithium manganate battery positive electrode (8), a starting lithium manganate battery negative electrode (9) and related connecting harnesses, wherein: The positive and negative electrodes of the external power source (7) for charging the starting lithium manganese oxide battery are respectively connected to the positive electrode (8) of the starting lithium manganese oxide battery and the negative electrode (9) of the starting lithium manganese oxide battery; the positive electrode (8) of the starting lithium manganese oxide battery is connected to the heating circuit relay (2); the heating circuit relay (2) is respectively connected to the battery management system (4) and the battery pack heating belt (5); the battery management system (4) is connected to the temperature sensor (3); the temperature sensor (3) is connected to the starting lithium manganese oxide battery pack (6); the negative electrode (9) of the starting lithium manganese oxide battery is respectively connected to the battery pack heating belt (5) and the negative electrode of the starting lithium manganese oxide battery pack (6) to form a heating control circuit; The external power source (7) for charging the starting lithium manganese oxide battery is respectively connected to the positive electrode (8) of the starting lithium manganese oxide battery and the negative electrode (9) of the starting lithium manganese oxide battery. The positive electrode (8) of the starting lithium manganese oxide battery is connected to the charging circuit relay (1). The charging circuit relay (1) is respectively connected to the battery management system (4) and the starting lithium manganese oxide battery pack (6). The negative electrode (9) of the starting lithium manganese oxide battery is connected to the negative electrode of the starting lithium manganese oxide battery pack (6) to form a charging control circuit.

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