A battery box and battery pack for reducing battery loss
By designing a battery box structure including heating system and air-cooled cooling system, the problem of low power conversion rate of new energy vehicle power batteries in cold conditions is solved, the consistency and optimal state of the battery cell temperature are achieved, and the battery performance and safety are improved.
Patent Information
- Application Number
- CN202411742865.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-29
- Publication Date
- 2025-04-08
AI Technical Summary
The power conversion rate of new energy vehicle power batteries is low in cold conditions, resulting in a reduction in vehicle mileage. The battery box temperature is too high or too low, which will cause natural damage to the battery cell, increasing safety risks.
A battery box structure is designed, including an upper case, a lower case, a cylindrical cell, a temperature sensor, a heating system, a heat dissipation system and a control module. The system achieves uniform heating of the battery cell by heating the inner lining plate, flexible thermal conduction lines and thermally conductive epoxy plates, and combines the air-cooled heat dissipation system to ensure that the battery cell maintains the optimal working temperature under various temperature environments.
It effectively improves the power conversion rate of the power battery pack in cold environments, ensures the temperature consistency of the battery cell, extends the battery life, reduces safety risks, and reduces weight relative to the water-cooled cooling structure.
Smart Images
Figure CN119786854A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of new energy vehicle power batteries and relates to a battery box structure and a battery pack that can effectively reduce battery loss. Background Art
[0002] New energy vehicles in the existing technology all rely on the cylindrical cells in the battery pack to provide a continuous supply of electricity to drive the vehicle forward; the power battery pack is the power source of new energy vehicles, and the temperature of its battery box directly affects the vehicle's range. The power battery pack can continuously provide power for the vehicle under constant temperature conditions. In cold conditions, the cylindrical cells in the battery pack will decompose the internal ions of the cylindrical cells slowly due to the low temperature, resulting in insufficient power supply, causing the vehicle mileage to reach only 70% or less of the designed mileage. If the temperature of the battery box is too high, the cells will easily freeze naturally, leading to accidents.
[0003] Therefore, the thermal management of power battery packs has become a specialized discipline to solve and balance the problem of heat accumulation in the battery cells in the power battery packs. Summary of the invention
[0004] In order to solve the deficiencies in the prior art, the present invention provides a battery case and a battery pack that reduce battery loss, which are used to solve the problem of low power conversion rate of power batteries for new energy vehicles under cold conditions, ensure that the operating temperature of the battery cells is in the optimal state under various temperature environments, and effectively solve the problems existing in the prior art.
[0005] The technical solution adopted by the present invention to achieve the above-mentioned purpose is: a battery box for reducing battery loss, comprising an upper shell, a lower shell, a cylindrical battery cell, a temperature sensor, a heating system, a heat dissipation system and a control module, wherein the upper shell and the lower shell are connected by bolts to form a closed battery box, the cylindrical battery cells are arranged in a matrix in the battery box, the temperature sensor is arranged in the battery box for monitoring the internal temperature of the battery box, and the temperature sensor, the heating system and the heat dissipation system are electrically connected to the control module respectively; The heating system comprises a heating lining plate, a flexible heat-conducting strip and a heat-conducting epoxy plate. The heating lining plate is arranged at the bottom of the lower shell. The upper surface of the heating lining plate is depressed downward and a wire groove for accommodating the flexible heat-conducting strip is stamped thereon. The flexible heat-conducting strip is positioned in the wire groove, and the terminal of the flexible heat-conducting strip extends to the outside of the battery box and is electrically connected to the control module. The heat-conducting epoxy plate is arranged on the upper side of the heating lining plate, and the cylindrical cells are distributed in a matrix and fixed on the upper side of the heat-conducting epoxy plate. The heat-conducting epoxy plate forms a surface contact between the flexible heat-conducting strip and the cylindrical cells. The heat dissipation system includes a power battery radiator, a circulation pump and an air cooler. The power battery radiator is arranged outside the battery box. The power battery radiator is connected to the air cooler through an air pipeline and a circulation pump to form an air cooling circuit. The circulation pump is electrically connected to the control module.
[0006] A further technical solution of the present invention is that the wire trough is evenly covered with heating lining plates.
[0007] A further technical solution of the present invention is: the flexible thermally conductive strip includes a heating wire, a flexible thermally conductive layer and a heating temperature sensor, the flexible thermally conductive layer is coated on the outside of the heating wire, the heating temperature sensors are respectively arranged at intervals on the outside of the flexible thermally conductive layer for obtaining the heating temperature of the heating wire, and the heating temperature sensors are respectively electrically connected to the control modules; the wiring terminals of the heating wire extend to the outside of the battery box and are electrically connected to the control module.
[0008] A further technical solution of the present invention is that the flexible heat-conducting layer is a heat-conducting insulating elastic rubber.
[0009] A further technical solution of the present invention is: the upper shell and the lower shell are made of low-strength steel material.
[0010] Another technical solution of the present invention is: a battery pack, comprising a battery box for reducing battery loss as described in any one of the above items.
[0011] The battery box and battery pack for reducing battery loss of the present invention have the following beneficial effects due to the above structure: 1. There are two main ways to dissipate heat for power batteries at present: air cooling and water cooling. Air cooling does not need to worry about water leakage caused by poor sealing of cooling water pipes, and the battery box structure is simple; although the temperature control effect of water cooling is better than that of air cooling, water cooling has higher requirements for the sealing performance and assembly performance of the battery box, and the production cost increases with high requirements.
[0012] The heat dissipation system of the present invention adopts an air-cooling structure, including a power battery radiator, a circulation pump and an air cooler. The power battery radiator is arranged on the outside of the battery box. The power battery radiator is connected to the air cooler through an air pipeline and a circulation pump to form an air-cooling circuit. The battery box structure is simple and the weight is reduced by 3% compared with the water-cooled heat dissipation structure.
[0013] 2. The temperature control system is an important means to control the cylindrical battery cell to work normally within the set temperature range. Temperature control is not just a simple cooling or heating, but also requires the battery cell temperature to be kept within a reasonable temperature range. That is to say, in most cases, how to achieve temperature consistency between the various batteries in the battery pack. This is because the heat consumption rate of the battery at different temperatures (the heat consumed for each 1kW·h of electrical energy generated) is different. If the cylindrical battery cell is operated in an internal environment with insufficient heat transfer such as extreme cold or cold, the temperature of the cylindrical battery cell will drop, resulting in "heat loss" inside the center of the battery pack. Once there is a problem with the temperature consistency of the cylindrical battery cell, the performance of the entire battery pack will be attenuated by about 10%, which may eventually lead to difficulty in starting the car or reduced mileage. Therefore, the temperature control system plays a vital role, so that the battery cell is always in a constant temperature environment. The power battery of the present invention has an excellent temperature control effect, especially it can achieve the effects of heating and cooling the battery cell, so that the battery cell is always in the optimal operating temperature range, so that the energy conversion rate of the power battery pack in a cold environment is greatly improved.
[0014] 3. The present invention uses a thermally conductive epoxy plate to form a surface contact between the flexible thermally conductive line and the cylindrical battery cell, ensuring that the heating temperature of each battery cell is the same and the temperature consistency of the cylindrical battery cell is good, thereby greatly improving the performance of the battery pack.
[0015] The following is a further description of a battery box and a battery pack for reducing battery loss according to the present invention in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 It is a structural schematic diagram of a battery box for reducing battery loss according to the present invention; Figure 2 It is a schematic diagram of the decomposed structure of the present invention; Figure 3 is a schematic diagram of the internal structure of the present invention (the upper housing is omitted); Figure 4 It is a schematic diagram of the exploded structure of the heating system; Figure 5 It is a schematic diagram of the structure of the heating lining plate; Figure 6 It is a schematic diagram of the structure of the flexible thermal conductive line; Figure 7 It is the temperature control principle diagram of the present invention; Explanation of the accompanying numbers: 1-upper shell, 2-lower shell, 3-cylindrical battery cell, 4-thermal conductive epoxy board, 5-heating lining board, 51-wire slot, 6-flexible thermal conductive line, 61-flexible thermal conductive layer, 62-heating wire, 7-circulation pump, 8-air cooler, 9-power battery radiator. DETAILED DESCRIPTION
[0017] like Figures 1 to 7 As shown, a battery case for reducing battery loss of the present invention comprises an upper shell 1, a lower shell 2, a cylindrical battery cell 3, a temperature sensor, a heating system, a heat dissipation system and a control module, wherein the upper shell 1 and the lower shell 2 are made of low-strength steel material; and the upper shell 1 and the lower shell 2 are connected by bolts to form a closed battery case, the cylindrical battery cell 3 is arranged in a matrix in the longitude and latitude directions in the battery case, a temperature sensor is arranged in the battery case for monitoring the internal temperature of the battery case (not shown in the figure), and the temperature sensor, the heating system and the heat dissipation system are electrically connected to the control module respectively.
[0018] The heating system includes a heating lining plate 5, a flexible thermally conductive line 6 and a thermally conductive epoxy plate 4, wherein the heating lining plate 5 is arranged at the bottom of the lower shell 2, and the upper end surface of the heating lining plate 5 is recessed downward and stamped with a wire groove 51 for accommodating the flexible thermally conductive line 6, and the wire groove 51 is evenly distributed over the heating lining plate 5; the flexible thermally conductive line 6 is positioned in the wire groove 51, and the terminal of the flexible thermally conductive line 6 extends to the outside of the battery box and is electrically connected to the control module; the thermally conductive epoxy plate 4 is arranged on the upper side of the heating lining plate 5, and the cylindrical battery cells 3 are distributed in a matrix and fixed on the upper side of the thermally conductive epoxy plate 4, and the thermally conductive epoxy plate 4 forms a surface contact between the flexible thermally conductive line 6 and the cylindrical battery cells 3, thereby ensuring that the heating temperature of each cylindrical battery cell 3 is the same, and the temperature consistency of the cylindrical battery cells 3 is good, thereby greatly improving the performance of the battery pack.
[0019] like Figure 6 As shown, the flexible heat-conducting strip 6 of the present invention includes a heating wire 62, a flexible heat-conducting layer 61 and a heating temperature sensor. The flexible heat-conducting layer 61 is coated on the outside of the heating wire 62. The heating temperature sensors are arranged at intervals on the outside of the flexible heat-conducting layer 61 to obtain the heating temperature of the heating wire 62 (not shown in the figure), and the heating temperature sensors are electrically connected to the control module respectively; the wiring terminal of the heating wire 62 extends to the outside of the battery box and is electrically connected to the control module. In this embodiment, the flexible heat-conducting layer 61 is a heat-conducting insulating elastic rubber; in addition, the thickness of the flexible heat-conducting strip of the present invention is between 2.5 mm and 3 mm, it is compressible, and the height is equivalent to the depth of the wire groove 51 in the heating lining plate 5.
[0020] The heat dissipation system includes a power battery radiator 9, a circulation pump 7 and an air cooler 8. The power battery radiator 9 is arranged outside the battery box. The power battery radiator 9 is connected to the air cooler 8 through an air pipeline and a circulation pump 7 to form an air cooling circuit. The circulation pump 7 is electrically connected to the control module.
[0021] The temperature control method of the present invention is as follows: A. When the temperature sensor detects that the temperature inside the battery box is higher than the set temperature range, the control module controls the circulation pump 7 to circulate, and the circulation pump 7 circulates the low-temperature air after the air cooler 8 dissipates the heat to the battery radiator 9 through the air pipeline, and cools the battery box and the cylindrical battery cells 3 inside through the battery radiator 9 until the temperature inside the battery box is within the set temperature range.
[0022] B. When the temperature sensor detects that the internal temperature of the battery case is lower than the set temperature range, the control module controls the circulation pump 7 not to work; at the same time, the control module controls the heating wire 62 of the flexible thermal conductive line 6 to be energized, and the heat generated by the heating wire 62 is transferred to the cylindrical battery cell 3 on its upper side through the thermal conductive epoxy plate 4, thereby heating the battery case and the cylindrical battery cell 3 inside. When the internal temperature of the battery case rises to the predetermined temperature range, the heating wire 62 stops heating.
[0023] In addition, the present invention also provides a battery pack, which includes the above-mentioned battery box for reducing battery loss.
[0024] The above embodiments are only preferred embodiments of the present invention. The structure of the present invention is not limited to the forms listed in the above embodiments. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A battery case for reducing battery loss, comprising an upper case (1), a lower case (2), a cylindrical battery cell (3), a temperature sensor, a heating system, a heat dissipation system and a control module, wherein the upper case (1) and the lower case (2) are connected by bolts to form a closed battery case, the cylindrical battery cells (3) are arranged in a matrix in the battery case, the temperature sensor is arranged in the battery case for monitoring the internal temperature of the battery case, and the temperature sensor, the heating system and the heat dissipation system are electrically connected to the control module respectively; characterized in that: The heating system comprises a heating lining plate (5), a flexible heat-conducting strip (6) and a heat-conducting epoxy plate (4); the heating lining plate (5) is arranged at the bottom of the lower shell (2); the upper end surface of the heating lining plate (5) is recessed downward and a wire groove (51) is punched to accommodate the flexible heat-conducting strip (6); the flexible heat-conducting strip (6) is positioned in the wire groove (51), and the connection terminal of the flexible heat-conducting strip (6) extends to the outside of the battery box and is electrically connected to the control module; the heat-conducting epoxy plate (4) is arranged on the upper side of the heating lining plate (5); the cylindrical battery cells (3) are distributed in a matrix and fixed on the upper side of the heat-conducting epoxy plate (4); the flexible heat-conducting strip (6) and the cylindrical battery cells (3) are in surface contact with each other through the heat-conducting epoxy plate (4); The heat dissipation system comprises a power battery radiator (9), a circulation pump (7) and an air cooler (8); the power battery radiator (9) is arranged outside the battery box; the power battery radiator (9) is connected to the air cooler (8) via an air pipeline and a circulation pump (7) to form an air cooling circuit; and the circulation pump (7) is electrically connected to a control module.
2. A battery box for reducing battery loss according to claim 1, characterized in that: The wire grooves (51) are evenly distributed over the heating lining plate (5).
3. A battery box for reducing battery loss according to claim 1, characterized in that: The flexible heat-conductive strip (6) comprises a heating wire (62), a flexible heat-conductive layer (61) and a heating temperature sensor, wherein the flexible heat-conductive layer (61) is coated on the outside of the heating wire (62), and the heating temperature sensors are arranged at intervals on the outside of the flexible heat-conductive layer (61) for obtaining the heating temperature of the heating wire (62), and the heating temperature sensors are electrically connected to the control module respectively; the wiring terminal of the heating wire (62) extends to the outside of the battery box and is electrically connected to the control module.
4. A battery box for reducing battery loss according to claim 3, characterized in that: The flexible heat-conducting layer (61) is heat-conducting insulating elastic rubber.
5. A battery box for reducing battery loss according to claim 1, characterized in that: The upper shell (1) and the lower shell (2) are made of low-strength steel material.
6. A battery pack, characterized in that: A battery box for reducing battery loss as described in any one of claims 1 to 5.