A fast-charging battery pack low-temperature uniform preheating system

Abstract

The utility model provides a kind of fast charging battery pack low temperature uniform preheating system, it is related to power fast charging battery thermal management technical field, and it includes: battery management system is respectively connected with battery pack temperature sensor, battery low temperature preheating system, battery thermal management unit electrically;Battery pack is connected with battery pack temperature sensor electrically;Multiple battery packs are provided in battery pack, and multiple battery pack surface is respectively provided with heating film, corresponding electric controller is respectively provided on each heating film, and electric controller is connected with battery low temperature preheating system electrically;Water cooling plate is set in multiple battery pack bottom;Cooling liquid pipeline one end is connected on water cooling plate, and the other end is connected on battery thermal management unit, to realize the uniform preheating to battery pack inside, substantially reduce the temperature difference in battery pack inside, to improve the consistency of battery pack temperature, also improve the use efficiency of battery.

Description

Technical Field

[0001] This utility model relates to the field of thermal management technology for power fast charging batteries, specifically a low-temperature uniform preheating system for fast charging battery packs. Background Technology

[0002] Fast-charging lithium-ion batteries are increasingly widely used in automotive power batteries due to their high charging power and fast charging speed. However, in low-temperature environments, the activity of various active materials in lithium-ion batteries decreases, and the internal resistance of the battery increases significantly, leading to a sharp drop in battery charging power. Usually, the capacity and charging power of the entire battery system are limited by the cell with the worst environmental conditions. In low-temperature environments, the large temperature difference between the cells inside the battery will also lead to a reduction in the charging and discharging power of the battery system, significantly reducing the efficiency of fast-charging batteries.

[0003] Currently, there are two main low-temperature heating technologies for fast-charging batteries: First, heating the coolant and transferring heat to the battery cells via a water-cooling plate; second, heat pump technology uses a refrigerant to absorb external heat for heating the battery. Both technologies transfer heat to the battery cells through a water-cooling plate. However, due to the complex internal flow channels of the water-cooling plate, uneven heat distribution can occur in low-temperature environments, and the temperature differences within the battery pack cannot be precisely controlled. This results in significant temperature variations between the battery cells, impacting battery efficiency. Utility Model Content

[0004] The purpose of this invention is to provide a low-temperature uniform preheating system for fast-charging battery packs, addressing the shortcomings of the prior art and solving the problems mentioned in the background section.

[0005] To achieve the above objectives, the technical solution adopted in this utility model embodiment is as follows:

[0006] A low-temperature uniform preheating system for fast-charging battery packs includes: a battery management system, which is electrically connected to a battery pack temperature sensor, a low-temperature preheating system, and a battery thermal management unit.

[0007] The battery pack is electrically connected to the battery pack temperature sensor.

[0008] The battery pack contains multiple battery groups, and each of the multiple battery groups has a heating film on its surface. Each heating film has a corresponding electric controller, and the electric controller is electrically connected to the battery low-temperature preheating system.

[0009] A water-cooled plate is disposed at the bottom of multiple battery packs;

[0010] The coolant pipeline is connected at one end to the water-cooled plate and at the other end to the battery thermal management unit.

[0011] The battery management system is used to monitor and manage the parameter information of the battery pack, the battery pack temperature sensor is used to monitor the operating temperature of the battery pack, the battery low-temperature preheating system is used to raise the temperature of the battery pack in low-temperature environments, and the battery thermal management unit is used to regulate the temperature of the battery pack.

[0012] Furthermore, in this utility model, the plurality of battery packs include: a first battery pack, a second battery pack, and a third battery pack;

[0013] The battery pack temperature sensor includes: a first battery pack temperature sensor, a second battery pack temperature sensor, and a third battery pack temperature sensor;

[0014] The first battery pack temperature sensor, the second battery pack temperature sensor, and the third battery pack temperature sensor are electrically connected to the first battery pack, the second battery pack, and the third battery pack, respectively.

[0015] Furthermore, in this utility model, the battery management system is electrically connected to the first battery pack temperature sensor, the second battery pack temperature sensor, and the third battery pack temperature sensor, respectively.

[0016] Furthermore, in this utility model, the electric controller includes: relay S1, relay S2, and relay S3, each of which is electrically connected to a corresponding heating film, and each of which is electrically connected to the battery low-temperature preheating system.

[0017] Furthermore, in this invention, a PTC heater is provided inside the battery thermal management unit.

[0018] Beneficial effects: The technical solution of this application has the following technical effects: Multiple battery packs are preheated uniformly by cooperating with multiple battery packs, heating films and battery thermal management units. Then, the temperature sensors inside the multiple battery packs collect the temperature of each battery pack to determine whether the battery needs to be preheated. The battery thermal management unit then heats the average temperature of the batteries to a certain threshold. Finally, the battery management system accurately identifies the temperature of multiple battery packs and heats the battery packs with lower temperatures. This achieves uniform preheating inside the battery packs, significantly reduces the temperature difference inside the battery packs, thereby improving the temperature consistency of the battery packs and also improving the battery's efficiency.

[0019] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered as part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other.

[0020] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0021] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0022] Figure 1 A block diagram of a low-temperature uniform preheating system for a fast-charging battery pack, provided in an embodiment of this utility model;

[0023] Figure 2 A partial structural diagram of a low-temperature uniform preheating system for a fast-charging battery pack provided in an embodiment of this utility model;

[0024] Figure 3 A flowchart illustrating the low-temperature uniform preheating system for a fast-charging battery pack, as provided in an embodiment of this utility model.

[0025] The meanings of the labels in the figures are as follows: 1-Battery Management System; 2-Battery Pack Temperature Sensor; 3-Battery Low Temperature Preheating System; 4-Battery Thermal Management Unit; 5-Battery Pack; 6-Coolant Piping; 51-First Battery Pack; 52-Second Battery Pack; 53-Third Battery Pack; 7-Heating Film; 81-Relay S1; 82-Relay S2; 83-Relay S3; 9-Water Cooling Plate. Detailed Implementation

[0026] To better understand the technical content of this utility model, specific embodiments are described below in conjunction with the accompanying drawings. Various aspects of this utility model are described in this disclosure with reference to the accompanying drawings, which illustrate numerous illustrative embodiments. The embodiments of this disclosure are not necessarily defined to include all aspects of this utility model. It should be understood that the various concepts and embodiments described above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed in this utility model are not limited to any particular implementation. Furthermore, some aspects of this utility model can be used alone or in any suitable combination with other aspects disclosed in this utility model.

[0027] like Figure 1-2As shown, a low-temperature uniform preheating system for fast-charging battery packs includes: a battery management system 1, which is electrically connected to a battery pack temperature sensor 2, a battery low-temperature preheating system 3, and a battery thermal management unit 4.

[0028] The battery pack 5 is electrically connected to the battery pack temperature sensor 2; the battery pack 5 contains multiple battery packs, and each of the multiple battery packs has a heating film 7 on its surface. Each heating film 7 has a corresponding electric controller, and the electric controller is electrically connected to the battery low-temperature preheating system 3; the water-cooled plate 9 is located at the bottom of the multiple battery packs; one end of the coolant pipe 6 is connected to the water-cooled plate 9, and the other end is connected to the battery thermal management unit 4.

[0029] The battery management system 1 monitors and manages the battery pack's parameters, including the charging and discharging process, temperature, voltage, and other key parameters, to ensure battery safety, extend lifespan, and optimize performance. The battery pack temperature sensor 2 monitors the operating temperature of the battery pack 5, ensuring it operates within a safe range and preventing overheating or overcooling from affecting performance and lifespan. The battery low-temperature preheating system 3 raises the temperature of the battery pack 5 in low-temperature environments, ensuring battery performance and charging efficiency while preventing damage caused by low temperatures. The battery thermal management unit 4 regulates the battery pack temperature, ensuring it operates within its optimal operating temperature range, thereby improving battery performance. Efficiency, extended service life, and safety are all ensured. The battery pack 5 is a core component of electric vehicles or energy storage systems, used to store electrical energy and provide power to the vehicle or equipment. The heating film 7 provides uniform heating to the battery pack in low-temperature environments, ensuring that the battery remains within a suitable operating temperature range to maintain its performance and charging efficiency. The electric controller is used to regulate and control the operating state of the heating film 7. The water-cooled plate 9 absorbs and removes the heat generated by the battery pack through circulating coolant, thereby maintaining the battery's operating temperature within a safe and efficient range. The coolant pipeline 6 is used to realize the circulation of coolant between the battery pack 5 and the battery thermal management unit 4.

[0030] Each battery pack has a heating film 7 on its surface, which is a polyimide heating film. It is thin, flexible, and has good high-temperature stability (up to 300°C or higher). It is used to heat the battery pack in low-temperature environments to ensure the normal operating temperature of the battery under cold conditions, improve charging and discharging efficiency, and prevent battery performance degradation. Each battery pack has a water-cooling plate 9 at the bottom to cool the battery during high-temperature or high-power operation. Excess heat is removed by the circulation of coolant to prevent the battery from overheating and ensure its safety and lifespan.

[0031] This application uses a combination of multiple battery packs, a heating film 7, and a battery thermal management unit 4 to uniformly preheat multiple battery packs. Then, the battery pack temperature sensor 2 inside each battery pack collects the temperature of each battery pack to determine whether the battery needs preheating. The battery thermal management unit 4 then heats the average temperature of the batteries to a certain threshold. Finally, the battery management system 1 accurately identifies the temperature of multiple battery packs and heats the battery packs with lower temperatures. This achieves uniform preheating of the battery packs, significantly reduces the temperature difference inside the battery packs, improves the temperature consistency of the battery packs, and also improves the battery's efficiency.

[0032] Furthermore, the multiple battery packs include: a first battery pack 51, a second battery pack 52, and a third battery pack 53; the battery pack temperature sensor 2 includes: a first battery pack temperature sensor, a second battery pack temperature sensor, and a third battery pack temperature sensor; the first battery pack temperature sensor, the second battery pack temperature sensor, and the third battery pack temperature sensor are electrically connected to the first battery pack 51, the second battery pack 52, and the third battery pack 53, respectively; the battery management system 1 is electrically connected to the first battery pack temperature sensor, the second battery pack temperature sensor, and the third battery pack temperature sensor, respectively.

[0033] In this embodiment, the temperature sensors of the first, second, and third battery packs are all Pt100 Teflon-encapsulated temperature sensors. The first battery pack 51, the second battery pack 52, and the third battery pack 53 are three independent battery modules in the battery pack 5, which together constitute the energy storage unit of the entire battery system. The battery management system 1 is electrically connected to the temperature sensors of the first, second, and third battery packs, respectively, and receives the temperature data collected by the corresponding first, second, and third battery packs, thereby enabling monitoring of the temperature status of each battery pack. In other words, the battery management system 1 can more accurately determine the thermal state of each battery pack, thereby ensuring the safe and efficient operation of the battery pack.

[0034] Furthermore, the electric controller includes: relay S1, relay S2, and relay S3, each of which is electrically connected to a corresponding heating film 7, and each of which is electrically connected to the battery low-temperature preheating system 3.

[0035] In this embodiment, relays S1, S2, and S3 are electronically controlled switches used to control the on / off state of the corresponding heating films 7; that is, relay S1 controls the heating film of the first battery pack 51; relay S2 controls the heating film of the second battery pack 52; and relay S3 controls the heating film of the third battery pack 53. At the same time, relays S1, S2, and S3 are also electrically connected to the battery low-temperature preheating system 3, that is, their switching actions are automatically controlled by the low-temperature preheating system according to the current battery temperature. For example, when the battery pack temperature sensor detects that the temperature of the corresponding battery pack is too low, the system will control the corresponding heating film 7 to start heating through the corresponding relay.

[0036] Furthermore, a PTC heater is installed inside the battery thermal management unit 4.

[0037] In this embodiment, a PTC heating device is integrated into the battery thermal management unit 4 to heat the coolant under low temperature conditions. The coolant is circulated to provide heating for each battery pack, thereby maintaining the battery within the optimal operating temperature range and ensuring battery performance and safety.

[0038] refer to Figure 3 The working process of this fast-charging battery pack low-temperature uniform preheating system is as follows:

[0039] Step 1: After the battery pack temperature sensor 2 collects the temperature of each battery pack and calculates the average temperature T2 inside the battery pack 5, proceed to Step 2.

[0040] Step 2: The battery management system 1 determines whether T2 is less than T1 based on the average temperature T2 of battery pack 5 obtained in Step 1. If T2 < T1, then proceed to Step 3; otherwise, proceed to Step 1.

[0041] Where T1 is the lowest temperature at which the battery pack maintains its maximum charging power;

[0042] Step 3: Battery Management System 1 activates Battery Low Temperature Preheating System 3. Battery Low Temperature Preheating System 3 determines whether T1-T2 is greater than t. If T1-T2>t, proceed to Step 4; otherwise, proceed to Step 5. Here, t is the temperature difference threshold for the Battery Management System to activate uniform preheating of the battery. The specific value can be set by the user according to the battery's own properties and is not restricted here.

[0043] Step 4: The battery low-temperature preheating system 3 transmits a heating signal to the battery thermal management unit 4. After receiving the heating signal, the battery thermal management unit 4 starts to heat the coolant and circulate it. The heat of the coolant is transferred to each battery pack through the water cooling plate 9. When the average battery temperature T1 is heated to meet the condition T1-T2<t, step 5 is executed.

[0044] Step 5: When T1-T2<t, the battery low temperature preheating system 3 detects whether the battery thermal management unit 4 is in the on state. If the battery thermal management unit 4 is in the on state at this time, then turn off the battery thermal management unit 4 and proceed to step 6. If the battery thermal management unit 4 is in the off state, then directly proceed to step 6 to preheat the battery evenly.

[0045] Step 6: The battery management system collects data from the temperature sensor of each battery pack and determines whether the temperature of each battery pack is less than T1. If the temperature of each battery pack is greater than or equal to T1, proceed to step 1. If the temperature of any battery pack is less than T1, proceed to step 7.

[0046] Step 7: Based on Step 6, if the temperature of a certain battery pack is less than T1, the battery management system 1 sends a command to the battery low-temperature preheating system 3 to turn off the relays (S1-S3) on the heating film 7 of the corresponding battery pack. The battery pack with a temperature less than T1 starts to heat up and Step 8 is executed. For example, if the temperature of the first battery pack 51 is less than T1, and the lowest temperature of the second battery pack 52 and the third battery pack 53 is greater than T1, then the battery management system 1 sends a command to the battery low-temperature preheating system 3 to turn off the relay S1 on the heating film 7 of the first battery pack 51, and the first battery pack 51 starts to heat up.

[0047] Step 8: The battery management system 1 collects data from the temperature sensors of each battery pack. When the temperature of all battery packs is greater than T1, the relays (S1-S3) on all heating films 7 are disconnected, and step 9 is executed.

[0048] Step 9: Battery Management System 1 shuts down Battery Low Temperature Preheating System 3 and proceeds to Step 1.

[0049] All standard parts used in this application can be purchased from the market, and can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. The control method is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art and is common knowledge in the field. Since this application is mainly used to protect mechanical devices, this application will not explain the control method and circuit metal in detail.

[0050] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A low-temperature uniform preheating system for fast-charging battery packs, characterized in that, include: The battery management system (1) is electrically connected to the battery pack temperature sensor (2), the battery low temperature preheating system (3), and the battery thermal management unit (4), respectively. The battery pack (5) is electrically connected to the battery pack temperature sensor (2); The battery pack (5) contains multiple battery groups, and each of the multiple battery groups has a heating film (7) on its surface. Each heating film (7) has a corresponding electric controller, and the electric controller is electrically connected to the battery low-temperature preheating system (3). Water-cooled plate (9) is disposed at the bottom of multiple battery packs; The coolant pipeline (6) is connected at one end to the water-cooled plate (9) and at the other end to the battery thermal management unit (4); The battery management system (1) is used to monitor and manage the parameter information of the battery pack, the battery pack temperature sensor (2) is used to monitor the working temperature of the battery pack (5), the battery low temperature preheating system (3) is used to raise the temperature of the battery pack (5) in a low temperature environment, and the battery thermal management unit (4) is used to regulate the temperature of the battery pack.

2. The low-temperature uniform preheating system for a fast-charging battery pack according to claim 1, characterized in that, The plurality of battery packs include: a first battery pack (51), a second battery pack (52), and a third battery pack (53); The battery pack temperature sensor (2) includes: a first battery pack temperature sensor, a second battery pack temperature sensor, and a third battery pack temperature sensor; The first battery pack temperature sensor, the second battery pack temperature sensor, and the third battery pack temperature sensor are electrically connected to the first battery pack (51), the second battery pack (52), and the third battery pack (53), respectively.

3. The low-temperature uniform preheating system for a fast-charging battery pack according to claim 2, characterized in that, The battery management system (1) is electrically connected to the first battery pack temperature sensor, the second battery pack temperature sensor, and the third battery pack temperature sensor, respectively.

4. The low-temperature uniform preheating system for a fast-charging battery pack according to claim 3, characterized in that, The electric controller includes: relay S1 (81), relay S2 (82), and relay S3 (83). Each of the relays S1 (81), S2 (82), and S3 (83) is electrically connected to a corresponding heating film (7), and each of the relays S1 (81), S2 (82), and S3 (83) is electrically connected to the battery low-temperature preheating system (3).

5. The low-temperature uniform preheating system for a fast-charging battery pack according to claim 1, characterized in that, The battery thermal management unit (4) is equipped with a PTC heater.

Images