CN-121601879-B - Extremely low temperature start-up battery system

CN121601879BCN 121601879 BCN121601879 BCN 121601879BCN-121601879-B

Abstract

The invention provides an extremely low temperature starting battery system, which relates to the technical field of battery thermal management and comprises a receiving module, an acquisition module and a judging module, wherein the receiving module is used for receiving an externally input charge and discharge request instruction and analyzing the instruction to obtain a standardized request type parameter, the acquisition module is used for starting a multi-path temperature acquisition process according to the standardized request type parameter and acquiring environmental temperature and battery temperature data to obtain current temperature state information, and the judging module is used for dividing the environmental temperature into a preset extremely low temperature interval, a preset normal low temperature interval and a preset non-low temperature interval according to the request type parameter and the environmental temperature data in the current temperature state information to obtain a temperature interval dividing result and judging heating starting conditions based on the dividing result and the request type parameter to obtain a judging result. The invention realizes safe and efficient charge and discharge starting of the battery under extremely cold conditions.

Inventors

ZHANG DETIAN
WANG SHIGUANG
HE MIAOFENG

Assignees

宁波兆科新能源科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260128

Claims (9)

1. An extremely low temperature start-up battery system, comprising: The receiving module is used for receiving a charge and discharge request instruction input from the outside, analyzing the instruction to obtain standardized request type parameters, and comprises the steps of receiving a charge and discharge request data packet from a user terminal, performing format verification and integrity verification on the data packet, and generating a data packet passing verification; Deconstructing the verified data packet according to a preset communication protocol, extracting an instruction type field, a voltage parameter field and a current parameter field from the data packet, and forming a structured instruction data set containing a plurality of discrete parameters; three characteristic vertexes are selected from the structured instruction data set, wherein the three characteristic vertexes comprise a charging voltage request value, a charging current multiplying power request value and a total request energy value; based on the three characteristic vertexes, mapping the charging voltage request value, the charging current multiplying power request value and the total request energy value into three vertex coordinates of a virtual triangle respectively, and calculating the geometric gravity center of the virtual triangle to obtain characteristic gravity center parameters representing the current charging and discharging request comprehensive state; Matching the characteristic gravity center parameter with a preset request type mapping relation database, wherein the request type mapping relation database comprises a plurality of preset mapping relations between temperature intervals and request types, and comparing the characteristic gravity center parameter with a threshold interval in the database to output a standardized request type parameter, wherein the request type parameter is used for identifying that the current request is one of a quick charging request, a conventional charging request or a low-power charging request; The acquisition module is used for starting a multi-path temperature acquisition process according to the standardized request type parameters, acquiring the ambient temperature and battery temperature data and obtaining the current temperature state information; The judging module is used for dividing the ambient temperature into a preset extreme low temperature zone, a preset normal low temperature zone and a preset non-low temperature zone according to the request type parameter and the ambient temperature data in the current temperature state information to obtain a temperature zone dividing result, and judging the heating starting condition based on the dividing result and the request type parameter to obtain a judging result; The heating module is used for judging the current power supply source based on the judging result, controlling the heating device to start if the power supply source is an external AC power supply and heating the battery, detecting the current state of charge of the battery if the power supply source is a non-external power supply, and controlling the heating device to start when the current state of charge reaches or is higher than a preset threshold value; the temperature control module is used for monitoring the temperature of the battery in real time after the heating device is started, and heating the battery to the target temperature threshold value by calculating the temperature difference measurement value between the current battery temperature and the target temperature threshold value corresponding to the charging and discharging request type and dynamically adjusting the heating intensity according to the temperature difference measurement value; And the execution module is used for controlling the heating device to stop heating when the battery temperature reaches the target temperature threshold value and executing charging and discharging operations corresponding to the charging and discharging requests.
2. The extreme low temperature start battery system of claim 1, wherein the starting of the multi-path temperature acquisition process according to the standardized request type parameter and the obtaining of the ambient temperature and the battery temperature data to obtain the current temperature state information comprises: Generating a multi-path temperature acquisition instruction based on standardized request type parameters, and transmitting synchronous acquisition signals to a plurality of temperature sensors arranged inside and outside the battery pack through a distributed sensor network; receiving an ambient temperature data stream and a battery temperature data stream returned by each temperature sensor, carrying out communication checksum format analysis on the received data streams, and extracting a temperature measurement value sequence; And (3) inputting the temperature measurement value sequence into data verification and fusion, and obtaining the current temperature state information containing the environmental temperature characteristic value and the battery temperature characteristic value through data validity verification, abnormal value elimination and multi-sensor data fusion processing.
3. The extreme low temperature start battery system according to claim 2, wherein the dividing the ambient temperature into a preset extreme low temperature zone, a normal low temperature zone and a non-low temperature zone according to the request type parameter and the ambient temperature data in the current temperature state information to obtain a temperature zone division result, and the judging of the heating start condition based on the division result and the request type parameter to obtain a judgment result, comprises: Taking the extracted environmental temperature data and request type parameters as input, and initializing a root node of the quadtree partition structure according to a preset temperature interval boundary value; Based on the initialized root node temperature range representation, performing quadtree recursive partitioning operation, generating four sub-nodes at each level by a temperature interval dichotomy, wherein each sub-node corresponds to a specific temperature sub-interval, forming a temperature interval classification topological structure with a multi-level relation, and finally constructing a complete temperature domain classification system containing extremely low temperature, conventional low temperature and non-low temperature intervals; Inputting the temperature value to be classified into a data processing interface of a quadtree classification system, comparing the belonged range of the temperature value layer by layer in a tree structure through a hierarchical traversal matching algorithm based on depth-first search, and positioning to a final leaf node to obtain a corresponding temperature interval classification code as a division result; Based on the dividing result and the request type parameter, a preset heating logic judging rule is called, if the request type is a charging request and the dividing result indicates an extremely low temperature zone, the heating starting condition is judged to be met, and if the request type is a discharging request and the dividing result indicates an extremely low temperature zone, the heating starting condition is judged to be met, so that a judging result is obtained.
4. The system of claim 3, wherein the means for controlling the heating means to start and heat the battery if the current source of power is an external AC power source comprises: Based on the judgment result, receiving a logic judgment signal, triggering a power supply source detection flow when the logic judgment signal indicates that the heating starting condition is met, and generating a power supply type identifier; and if the power supply type identifier indicates an external AC power supply, sending a starting instruction to a heating device driving circuit, and controlling the heating device to heat the battery with preset power.
5. The system of claim 4, wherein if the power source is a non-external power source, detecting a current state of charge of the battery and controlling the heating device to be activated when the current state of charge reaches or exceeds a predetermined threshold, comprising: when the power supply type identification indicates that the power supply is not an external power supply, starting a state of charge monitoring thread, and acquiring real-time state parameters of the battery pack through a battery management chip to obtain a current state of charge value after multiple verification; Comparing and analyzing the state of charge value with a preset grading safety threshold value to obtain a comparison result containing a state grade identifier; Based on the comparison result, performing condition judgment through a heating authorization decision, and obtaining a heating authorization instruction of the power level information when the state of charge value accords with a preset heating starting condition; transmitting the heating authorization instruction to the power regulation device, acquiring corresponding power control parameters by inquiring a power mapping relation database, obtaining a self-adaptive power regulation signal, and controlling the heating device to start running in a safe power interval.
6. The extremely low temperature start-up battery system according to claim 5, wherein after the heating device is started up, monitoring the battery temperature in real time, heating the battery temperature to the target temperature threshold by calculating a temperature difference measurement value between the current battery temperature and the target temperature threshold corresponding to the charge-discharge request type, and dynamically adjusting the heating intensity according to the temperature difference measurement value, comprising: Triggering a temperature real-time monitoring process after the heating device is started, and periodically collecting real-time battery temperature data from a battery pack internal temperature sensor; Constructing a search index key based on the type parameters of the charge-discharge request, inquiring a target temperature threshold mapping relation table stored in a nonvolatile memory, and acquiring a target temperature threshold parameter matched with the current request type; the processed standardized temperature data sequence and the target temperature threshold parameter are simultaneously input into a temperature comparator, and a real-time temperature difference measurement value is obtained through arithmetic difference operation calculation; Based on the real-time temperature difference measurement value, accessing a preset temperature difference and heating intensity mapping relation database, and dynamically analyzing the corresponding heating intensity level through an interpolation algorithm to obtain a heating intensity control signal with specific parameter configuration; Transmitting a heating intensity control signal to a digital power controller of the heating device, and adjusting the working power output of the heating device in real time through a duty ratio adjusting mechanism to obtain closed-loop control based on temperature difference feedback, so that the temperature of the battery gradually approaches a target temperature threshold according to a preset temperature rising curve; and continuously executing the monitoring, calculating and adjusting processes until the battery temperature monitored in real time reaches the target temperature threshold.
7. The extremely low temperature start-up battery system according to claim 6, wherein when the battery temperature reaches the target temperature threshold, the control heating means stops heating and performs the charge and discharge operation corresponding to the charge and discharge request, comprising: when the real-time battery temperature data continuously reach or exceed a target temperature threshold value, generating a temperature standard signal; Based on the temperature standard reaching signal, sending a heating stopping instruction to a heating device driving circuit to terminate the heating process of the battery; after confirming that the heating process is terminated, sending a status ready signal; based on the state ready signal and the request type parameter, a charging or discharging operation corresponding to the original charging or discharging request type is executed, and a starting process under the extremely low temperature condition is completed.
8. A computing device, comprising: One or more processors; storage means for storing one or more programs that, when executed by the one or more processors, cause the one or more processors to perform the system of any of claims 1-7.
9. A computer readable storage medium, characterized in that the computer readable storage medium has stored therein a program which, when executed by a processor, performs the system according to any of claims 1 to 7.

Description

Extremely low temperature start-up battery system Technical Field The invention relates to the technical field of battery thermal management, in particular to an extremely low-temperature starting battery system. Background In an extremely low-temperature environment (-40 ℃), the lithium battery can greatly increase the viscosity of electrolyte to cause the obstruction of ion conduction and the increase of interface impedance, meanwhile, the activity of lithium ions is reduced, and further, the problem of rapid deterioration of performance occurs, so that the energy output capability is greatly attenuated, and potential safety hazards such as precipitation of lithium dendrites and the like are easily caused in the charging and discharging process at low temperature. For example, when a mobile energy storage vehicle is in idle load debugging in an extremely cold night environment, a sudden single low-temperature lower limit alarm is given out, operation and maintenance personnel immediately adopt various modes such as a vehicle-mounted air conditioner, a diesel heater and blanket heat preservation, even if heating and heat preservation measures are continuously put into, heat can only act on the air of a battery compartment and is difficult to be effectively conducted into a battery core, so that the alarm cannot be eliminated for a long time, and the core defects of a traditional battery low-temperature starting scheme are clearly exposed in a case. The scheme relies on passive heat preservation or outside conduction type heating (such as PTC heating) more, has the problem that heat transfer efficiency is low, electric core heating rate is slow, and lacks the collaborative judgement mechanism to power supply source, battery state of charge (SOC) and heating demand, both can't adapt in a flexible way to off-grid etc. complicated power supply scene, also is difficult to avoid the too big or excessive energy consumption's of difference in temperature problem through accurate control by temperature, and whole suitability and reliability all can't satisfy the steady start demand under the extreme low temperature. Disclosure of Invention The invention aims to solve the technical problem of providing an extremely low-temperature starting battery system to realize safe and efficient charge and discharge starting of a battery under extremely cold conditions. In order to solve the technical problems, the technical scheme of the invention is as follows: In a first aspect, an extremely low temperature start-up battery system, comprising: the receiving module is used for receiving an externally input charge-discharge request instruction and analyzing the instruction to obtain a standardized request type parameter; The acquisition module is used for starting a multi-path temperature acquisition process according to the standardized request type parameters, acquiring the ambient temperature and battery temperature data and obtaining the current temperature state information; The judging module is used for dividing the ambient temperature into a preset extreme low temperature zone, a preset normal low temperature zone and a preset non-low temperature zone according to the request type parameter and the ambient temperature data in the current temperature state information to obtain a temperature zone dividing result, and judging the heating starting condition based on the dividing result and the request type parameter to obtain a judging result; The heating module is used for judging the current power supply source based on the judging result, controlling the heating device to start if the power supply source is an external AC power supply and heating the battery, detecting the current state of charge of the battery if the power supply source is a non-external power supply, and controlling the heating device to start when the current state of charge reaches or is higher than a preset threshold value; the temperature control module is used for monitoring the temperature of the battery in real time after the heating device is started, and heating the battery to the target temperature threshold value by calculating the temperature difference measurement value between the current battery temperature and the target temperature threshold value corresponding to the charging and discharging request type and dynamically adjusting the heating intensity according to the temperature difference measurement value; And the execution module is used for controlling the heating device to stop heating when the battery temperature reaches the target temperature threshold value and executing charging and discharging operations corresponding to the charging and discharging requests. Further, receiving an externally input charge-discharge request command, and analyzing the command to obtain a standardized request type parameter, including: receiving a charge-discharge request data packet from a user terminal, performing format verification and in