阅读说明：本技术 一种电解液流动型锂离子电池系统 (Electrolyte flowing type lithium ion battery system ) 是由 佘沛亮 于 2020-12-21 设计创作，主要内容包括：本发明适用于锂离子电池技术领域,提供了一种电解液流动型锂离子电池系统,本发明利用温度调节组件将锂离子电池的电解液调节至最佳工作温度,再利用循环泵将该电解液持续且同时输入每一个单体电芯内,替换单体电芯内的电解液,通过电解液的不断流动可以实现锂离子的有效补充,延长锂离子电池系统的使用寿命,同时,不断流动的电解液还能够快速调节单体电芯的温度,使其更快地达到最佳工作温度,另外,通过电解液不断流动的方式调节单体电芯温度的方式能够省去其他热管理部件,简化锂离子电池模块和锂离子电池系统的结构。(The invention is suitable for the technical field of lithium ion batteries, and provides an electrolyte flowing type lithium ion battery system, wherein the electrolyte of a lithium ion battery is regulated to the optimal working temperature by using a temperature regulating assembly, and is continuously and simultaneously input into each single battery cell by using a circulating pump to replace the electrolyte in the single battery cells, so that the effective supplement of lithium ions can be realized through the continuous flowing of the electrolyte, the service life of the lithium ion battery system is prolonged, meanwhile, the temperature of the single battery cells can be quickly regulated by the continuously flowing electrolyte, the optimal working temperature can be quickly reached, in addition, other heat management components can be omitted by regulating the temperature of the single battery cells by the continuous flowing mode of the electrolyte, and the structures of a lithium ion battery module and the lithium ion battery system are simplified.)

1. An electrolyte flowing type lithium ion battery system comprises a plurality of lithium ion battery modules, wherein each lithium ion battery module comprises a plurality of single battery cores, and the lithium ion battery system is characterized in that the single battery cores are provided with two input ports and an output port for electrolyte flowing, the output port is communicated with an inlet of an electrolyte storage tank, an outlet of the electrolyte storage tank is communicated with the input ports through a circulating pump, and electrolyte is filled in the electrolyte storage tank;

the electrolyte storage tank is provided with a temperature adjusting assembly for heating or cooling the electrolyte and a first temperature sensor for monitoring the temperature of the electrolyte, and the temperature adjusting assembly is driven by a driving assembly;

the first temperature sensor is electrically connected with a controller, and the controller is also electrically connected with the circulating pump, the temperature adjusting assembly and the driving assembly respectively;

the first temperature sensor monitors the temperature of the electrolyte in the electrolyte storage tank in real time, if the temperature is higher than a preset temperature interval, the controller controls the temperature adjusting assembly to refrigerate the electrolyte in the electrolyte storage tank, and if the temperature is lower than the preset temperature interval, the controller controls the temperature adjusting assembly to heat the electrolyte in the electrolyte storage tank;

and when the temperature of the electrolyte in the electrolyte storage tank is within a preset temperature range, starting the circulating pump, inputting the electrolyte in the electrolyte storage tank into each monomer electric core simultaneously, and replacing the electrolyte in the monomer electric cores.

2. The electrolyte flow type lithium ion battery system of claim 1, wherein the cell is provided with a second temperature sensor for monitoring the temperature of the electrolyte inside the cell, the second temperature sensor is electrically connected to the controller, the second temperature sensor monitors the temperature of the electrolyte inside the cell in real time, and if the temperature is higher than a preset temperature, the controller controls the circulating pump to increase the output power and accelerate the flow rate of the electrolyte.

3. The electrolyte flow type lithium ion battery system of claim 1, wherein the output and input ports are provided with one-way valves.

4. The electrolyte flow type lithium ion battery system of claim 1, wherein the temperature adjustment assembly comprises a circulation water jacket, a circulation water pump, a circulation water heat exchanger and an air conditioning system, the circulation water jacket is integrally formed with the electrolyte storage tank, the circulation water jacket is communicated with the circulation water heat exchanger through the circulation water pump, the air conditioning system is communicated with the circulation water heat exchanger, the driving assembly supplies power to the circulation water pump and the air conditioning system, and the controller is electrically connected with the circulation water pump and the air conditioning system.

5. The electrolyte flow-type lithium ion battery system according to claim 4, wherein the driving assembly is a power generation device, including a solar photovoltaic power generation device, a wind power generation device, or a gas power generation device.

Technical Field

The invention belongs to the technical field of lithium ion batteries, and particularly relates to an electrolyte flowing type lithium ion battery system.

Background

In the process of charging and discharging of the lithium ion battery, due to the continuous progress of side reactions, the concentration of lithium ions in electrolyte is continuously reduced, and the capacity of the battery is continuously reduced.

In addition, the capacity of a lithium ion battery system is greatly affected by the ambient temperature, and particularly, under very low ambient temperatures, such as-35 ℃, the actual capacity is often only half or even lower than the normal temperature capacity, so that how to perform effective thermal management is how many patents relate to the overall thermal management design of a lithium ion battery module and a system, but it is difficult to realize rapid temperature rise at an ultra-low temperature and rapid temperature drop at an ultra-high temperature.

In order to realize the thermal management of lithium ion battery modules and systems, many patents have been made relating to the field, including but not limited to liquid cooling, air cooling, phase change materials, etc., but these approaches have difficulty in realizing the rapid temperature rise of lithium ion monomer cells and have poor temperature uniformity.

Patent "a thermal management double-deck shell lithium ion battery" with application number CN201810413237.0 adopts double-deck shell lithium ion battery, is equipped with a plurality of runner strengthening ribs on the outer wall of battery body, is formed with the thermal management medium runner between the adjacent runner strengthening rib, is equipped with the thermal management medium and all scatters the collection chamber that gathers of thermal management medium on the up end of lithium ion battery body and be located the outside of positive and negative pole, and this method can solve high temperature rapid cooling problem, but low temperature rapid heating effect is general.

Patent CN201610999900.0 entitled "system and method for partitioned thermal management based on lithium ion battery" combines phase change material and liquid cooling to realize partitioned thermal management of battery pack, but at ultra-high temperature and ultra-low temperature, phase change material becomes an obstacle to rapid temperature rise.

Disclosure of Invention

The invention provides an electrolyte flowing type lithium ion battery system, and aims to solve the technical problem.

The invention is realized in such a way that an electrolyte flowing type lithium ion battery system comprises a plurality of lithium ion battery modules, wherein each lithium ion battery module comprises a plurality of monomer battery cores, each monomer battery core is provided with two input ports and an output port for flowing electrolyte, the output ports are communicated with an inlet of an electrolyte storage tank, an outlet of the electrolyte storage tank is communicated with the input ports through a circulating pump, and the electrolyte is filled in the electrolyte storage tank;

the electrolyte storage tank is provided with a temperature adjusting assembly for heating or cooling the electrolyte and a first temperature sensor for monitoring the temperature of the electrolyte, and the temperature adjusting assembly is driven by a driving assembly;

the first temperature sensor is electrically connected with a controller, and the controller is also electrically connected with the circulating pump, the temperature adjusting assembly and the driving assembly respectively;

the first temperature sensor monitors the temperature of the electrolyte in the electrolyte storage tank in real time, if the temperature is higher than a preset temperature interval, the controller controls the temperature adjusting assembly to refrigerate the electrolyte in the electrolyte storage tank, and if the temperature is lower than the preset temperature interval, the controller controls the temperature adjusting assembly to heat the electrolyte in the electrolyte storage tank;

and when the temperature of the electrolyte in the electrolyte storage tank is within a preset temperature range, starting the circulating pump, inputting the electrolyte in the electrolyte storage tank into each monomer electric core simultaneously, and replacing the electrolyte in the monomer electric cores.

Further, the monomer electric core is provided with a second temperature sensor for monitoring the temperature of the electrolyte inside the monomer electric core, the second temperature sensor is electrically connected with the controller, the second temperature sensor monitors the temperature of the electrolyte inside the monomer electric core in real time, and if the temperature is higher than a preset temperature, the controller controls the circulating pump to increase the output power and accelerate the flow rate of the electrolyte.

Still further, the output and input ports are provided with one-way valves.

Furthermore, the temperature regulation assembly comprises a circulating water jacket, a circulating water pump, a circulating water heat exchanger and an air conditioning system, the circulating water jacket is integrally formed with the electrolyte storage tank, the circulating water jacket is communicated with the circulating water heat exchanger through the circulating water pump, the air conditioning system is communicated with the circulating water heat exchanger, the driving assembly supplies power to the circulating water pump and the air conditioning system, and the controller is electrically connected with the circulating water pump and the air conditioning system.

Furthermore, the driving component is a power generation device, including a solar photovoltaic power generation device, a wind power generation device or a gas power generation device.

The electrolyte flowing type lithium ion battery system provided by the invention utilizes the temperature regulating assembly to regulate the electrolyte of the lithium ion battery to the optimal working temperature, then utilizes the circulating pump to continuously and simultaneously input the electrolyte into each single cell to replace the electrolyte in the single cell, can realize effective supplement of lithium ions through continuous flowing of the electrolyte, prolongs the service life of the lithium ion battery system, simultaneously can quickly regulate the temperature of the single cell to enable the single cell to reach the optimal working temperature more quickly, and in addition, can omit other heat management components through a mode of regulating the temperature of the single cell through continuous flowing of the electrolyte, and simplifies the structures of the lithium ion battery module and the lithium ion battery system.

Drawings

Fig. 1 is a schematic structural diagram of an electrolyte flow type lithium ion battery system according to an embodiment of the present invention;

fig. 2 is a block diagram of an electrolyte flow type lithium ion battery system according to an embodiment of the present invention.

The reference numbers in the figures denote: the method comprises the following steps of 1-a lithium ion battery module, 2-a single battery cell, 3-an input port, 4-an output port, 5-an electrolyte storage tank, 6-a circulating pump, 7-a first temperature sensor, 8-a controller, 9-a driving component, 10-a second temperature sensor, 11-a pressure gauge, 12-an electromagnetic valve, 13-a one-way valve, 14-a circulating water jacket, 15-a circulating water pump, 16-a circulating water heat exchanger and 17-an air conditioning system.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 and 2, an electrolyte flowing type lithium ion battery system according to an embodiment of the present invention includes a plurality of lithium ion battery modules 1, each lithium ion battery module 1 includes a plurality of single battery cells 2, each single battery cell 2 is provided with two input ports 3 and an output port 4 for flowing electrolyte, the output port 4 is communicated with an inlet of an electrolyte storage tank 5, an outlet of the electrolyte storage tank 5 is communicated with the input ports 3 through a circulation pump 6, and the electrolyte is filled in the electrolyte storage tank 5.

All the input ports 3 of the monomer electric cores 2 in the lithium ion battery module 1 are all connected with the outlet of the electrolyte storage tank 5 in parallel, and the outlet is provided with the circulating pump 6, the electrolyte is respectively input into each monomer electric core 2 through the circulating pump 6, so that the electrolyte keeps a flowing state, the electrolyte is continuously updated, lithium ions are supplemented, the electrolyte output by each monomer electric core 2 is respectively conveyed back into the electrolyte storage tank 5, the electrolyte in all the monomer electric cores 2 is in refreshing progress and is consistent in speed, and the temperature regulation progress and the speed of all the monomer electric cores 2 are consistent. In order to avoid backflow, the inlet 3 and the outlet 4 of each individual cell 2 are provided with a non-return valve 13.

The selection of the circulating pump 6 is taken as an example of a lithium ion battery system consisting of 25 lithium ion battery modules 1 consisting of 48V 100Ah, namely 16 square aluminum shells of 3.2V 100Ah, and the circulating pump 6 at least meets the transfusion quantity of 40kg of electrolyte and the delivery capacity of 60m of lift.

In addition, optionally, a pressure gauge 11 and an electromagnetic valve 12 are arranged at the input port 3 of each single battery cell 2, when the circulating pump 6 is started, the electrolyte is respectively conveyed to the electromagnetic valve 12 and the pressure gauge 11, and when the pressure values of all the pressure gauges 11 are consistent and stable, all the electromagnetic valves 12 are simultaneously started, so that the electrolyte is simultaneously input into the single battery cells 2, thereby further ensuring the synchronism of electrolyte input.

The electrolyte tank 5 is provided with a temperature adjustment assembly for heating or cooling the electrolyte, which is driven by a driving assembly 9, and a first temperature sensor 7 for monitoring the temperature of the electrolyte.

In the embodiment of the invention, the temperature adjusting assembly comprises a circulating water jacket 14, a circulating water pump 15, a circulating water heat exchanger 16 and an air conditioning system 17, the circulating water jacket 14 and the electrolyte storage tank 5 are integrally formed, the circulating water jacket 14 is communicated with the circulating water heat exchanger 16 through the circulating water pump 15, the air conditioning system 17 is communicated with the circulating water heat exchanger 16, the driving assembly 9 supplies power to the circulating water pump 15 and the air conditioning system 17, the controller 8 is electrically connected with the circulating water pump 15 and the air conditioning system 17, and the air conditioning system 17 is a heating and refrigerating air conditioning system in the prior art.

The temperature regulation assembly heats or cools water in the circulating water jacket 14, thereby heating or cooling the electrolyte in the electrolyte storage tank 5. The circulating water jacket 14 is a spiral water channel structure arranged on the outer wall of the electrolyte storage tank 5, and has a large contact area with the electrolyte storage tank 5, a long water channel and high heat exchange efficiency. The driving component 9 is a power generation device, and comprises a solar photovoltaic power generation device, a wind power generation device or a gas power generation device.

The first temperature sensor 7 is electrically connected with a controller 8, and the controller 8 is also electrically connected with the circulating pump 6, the temperature adjusting assembly and the driving assembly 9 respectively.

First temperature sensor 7 real-time supervision electrolyte temperature in electrolyte storage tank 5, if the temperature is higher than the temperature interval of predetermineeing, then 8 control temperature adjustment assembly of controller refrigerate for the electrolyte in electrolyte storage tank 5, if the temperature is less than the temperature interval of predetermineeing, then 8 control temperature adjustment assembly of controller heat for the electrolyte in electrolyte storage tank 5.

When the temperature of the electrolyte in the electrolyte storage tank 5 is within a preset temperature range, the circulating pump 6 is started, and the electrolyte in the electrolyte storage tank 5 is simultaneously input into each monomer electric core 2 to replace the electrolyte in the monomer electric core 2.

The controller 8 may be a programmable logic controller 8. The first temperature sensor 7 is used for monitoring the temperature of the electrolyte in the electrolyte storage tank 5 in real time, when the temperature exceeds a preset temperature range, for example, 15 ℃ to 25 ℃, the controller 8 electrically connected with the first temperature sensor 7 controls the temperature adjusting component to start, and the heating mode or the cooling mode is selected to be started according to the actual temperature.

The working principle of the temperature adjusting assembly is as follows:

(1) when the temperature of the monomer electric core 2 monitored by the first temperature sensor 7 is lower than 15 ℃, the controller 8 controls the air conditioning system 17 to start a heating mode, energy exchange is performed between circulating air and the circulating water heat exchanger 16, circulating water is heated, the controller 8 controls the circulating water pump 15 to start, the heated circulating water enters the circulating water jacket 14 through the circulating water pump 15, heating of the electrolyte storage tank 5 is achieved, the temperature of electrolyte entering the monomer electric core 2 is further improved, and the heating process is stopped when the lowest temperature of all the monomer electric cores 2 is higher than 18 ℃.

(2) When the temperature of the monomer electric core 2 monitored by the first temperature sensor 7 is higher than 25 ℃, the controller 8 controls the air conditioning system 17 to start a cooling mode, energy exchange is performed between circulating air and the circulating water heat exchanger 16, circulating water is cooled, the controller 8 controls the circulating water pump 15 to start, the cooled circulating water enters the circulating water jacket 14 through the circulating water pump 15, cooling of the electrolyte storage tank 5 is achieved, the temperature of electrolyte entering the monomer electric core 2 is further reduced, and the refrigeration process is stopped when the highest temperature of all the monomer electric cores 2 is lower than 22 ℃.

Optionally, the single battery cell 2 is provided with a second temperature sensor 10 for monitoring the temperature of the electrolyte inside the single battery cell 2, the second temperature sensor 10 is electrically connected to the controller 8, the second temperature sensor 10 monitors the temperature of the electrolyte inside the single battery cell 2 in real time, and if the temperature is higher than a preset temperature, the controller 8 controls the circulating pump 6 to increase the output power and accelerate the flow rate of the electrolyte.

The electrolyte temperature in the monomer electric core 2 is monitored by the second temperature sensor 10 in real time, when the electrolyte temperature is too high and exceeds a preset value or a warning value, the controller 8 electrically connected with the second temperature sensor 10 controls the circulating pump 6 to increase the output power, so that the flowing speed of the electrolyte is increased, the refreshing rate of the electrolyte in the monomer electric core 2 is increased, and the electrolyte temperature is reduced.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.