Power battery box capable of automatically controlling temperature

Abstract

The utility model provides a power battery box capable of automatically controlling temperature. Comprising a box body, and a battery module, a heat conduction pipeline and a thermoelectric assembly which are arranged in an inner cavity of the box body, the box body comprises a first inner wall, a second inner wall, a third inner wall and a fourth inner wall which are opposite to each other; the heat conduction pipeline is arranged between the first inner wall of the box body and the battery module; thermoelectric assemblies are arranged between the second inner wall, the third inner wall and the fourth inner wall of the box body and the battery module; and the thermoelectric assemblies in three directions and the heat conduction pipeline jointly surround the battery module. According to the utility model, the thermoelectric module is arranged in the battery box body, and through heat conduction between the thermoelectric module and the box body, on the basis that the heat conduction pipeline is used as a main temperature control adjusting device, the temperature of the battery module in other directions is synchronously regulated and controlled, so that the problem that the temperature of parts in different directions of the battery module in the box body cannot be synchronously regulated and controlled is effectively solved.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, and specifically relates to a self-temperature-controlled power battery box. Background Technology

[0002] In current power battery systems, the battery pack is generally composed of battery modules, housing, and liquid cooling system. The liquid cooling system adjusts the temperature of the internal environment of the battery pack. Currently, commonly used liquid cooling systems mainly adjust the temperature through flowing coolant. In low-temperature environments, since the outer shell of the battery pack is generally made of metal materials with a high thermal conductivity, the cells close to the battery housing transfer heat outwards quickly, while the cells far from the battery housing transfer heat outwards slowly.

[0003] In high-temperature environments, cells closer to the liquid cooling system lose more heat, while cells further away from the liquid cooling system lose less heat. Both of these situations lead to significant temperature differences between different parts of the cell, resulting in temperature differences between different zones within the battery casing. This temperature difference between different parts of the battery damages its lifespan. Furthermore, it causes voltage differences between the edge cells and the center cells, severely impacting the cell's charging and discharging performance and lifespan. Utility Model Content

[0004] To address the aforementioned issues, this utility model proposes a self-temperature-controlled power battery box, comprising: a box body and a battery module, heat conduction pipes, and thermoelectric components built into the box body cavity;

[0005] The enclosure includes a first inner wall and a second inner wall, a third inner wall and a fourth inner wall that are opposite to each other, and a heat conduction pipe is disposed between the first inner wall of the enclosure and the battery module.

[0006] The second, third, and fourth inner walls of the housing are all equipped with thermoelectric components between themselves and the battery module. The thermoelectric components in three directions, together with the heat conduction pipes, surround the battery module.

[0007] Furthermore, the thermoelectric assembly uses a semiconductor cooling chip, specifically including: a wiring harness, a semiconductor block, and a ceramic housing;

[0008] The ceramic housing has a linear strip structure. The ceramic housing has a receiving groove for storing semiconductor blocks, and one end of the ceramic housing has a wire harness for connecting the positive and negative terminals of the power supply. The wire harness includes a positive wire harness for connecting the positive terminal of the power supply and a negative wire harness for connecting the negative terminal of the power supply.

[0009] Furthermore, the ceramic housing is composed of two grooved ceramic substrates that are fastened together, and the two ceramic substrates are sealed together with epoxy resin.

[0010] Furthermore, temperature sensors are installed at the turning points of the first, second, third, and fourth inner walls of the enclosure, and the temperature sensors are electrically connected to the thermoelectric components.

[0011] Furthermore, temperature sensors are installed on the corresponding outer walls of the third and fourth inner walls of the enclosure.

[0012] Furthermore, both the output and input ends of the heat-conducting pipes penetrate through the first inner wall of the enclosure and are connected to the external refrigeration system. Temperature sensors are installed on the first inner wall of the enclosure next to both the output and input ends of the heat-conducting pipes, and the temperature sensors are electrically connected to the thermoelectric components.

[0013] Furthermore, the battery module includes a first module and a second module arranged symmetrically from left to right, with a gap between the first module and the second module, and a thermoelectric plug installed in the center of the gap.

[0014] Furthermore, the thermoelectric plug is connected in series with the thermoelectric component via connectors.

[0015] Furthermore, the thermoelectric components are fixed to the second, third, and fourth inner walls of the housing by adhesive bonding, and the thermoelectric inserts are fixed to the bottom inner wall of the housing by adhesive bonding.

[0016] Furthermore, the enclosure is made of aluminum sheet.

[0017] Compared with the prior art, the embodiments of this utility model have at least the following advantages:

[0018] 1. This utility model, by installing a thermoelectric module inside the battery box, enables simultaneous temperature regulation of other parts of the battery module through heat conduction between the thermoelectric module and the box when a temperature difference occurs between the ambient temperature and the box temperature. This is based on the heat conduction pipe as the main temperature control device. This effectively solves the problem that the temperature of different parts of the battery module inside the box cannot be regulated synchronously. At the same time, it reduces the influence of the external ambient temperature on the internal ambient temperature of the box, which is conducive to improving the temperature consistency of the battery modules inside the battery pack, thereby improving the depth of charge and discharge and the service life of the battery.

[0019] 2. Temperature monitoring at the output and input ends of the heat-conducting pipes effectively reduces the temperature difference in different parts of the battery module, thereby improving the service life of the battery module and reducing the voltage difference of the battery module caused by temperature differences.

[0020] 3. The internal temperature of the battery box is controlled by adding a thermoelectric module. No new mechanical devices are needed, and no waste gas or other pollution is generated. The volume utilization rate is improved while the temperature difference is minimized. It can be directly processed and modified on the battery box that has already been produced, and it has strong practicality.

[0021] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures pointed out in the description, claims, and drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of a self-temperature-controlled power battery box according to an embodiment of the present invention is shown;

[0024] Figure 2 A schematic diagram of the thermoelectric component in an embodiment of this utility model is shown;

[0025] Figure 3 An enlarged end view of the thermoelectric component in an embodiment of this utility model is shown;

[0026] Figure 4 A schematic diagram of the operation process of the self-temperature controlled power battery box according to an embodiment of the present invention is shown;

[0027] Figure 5 A schematic diagram showing the distribution of temperature sensors inside the self-temperature-controlled power battery box according to an embodiment of the present invention is shown.

[0028] In the diagram, 1-box, 2-battery module, 3-heat conduction pipe, 4-thermal electric component, 5-wire harness, 6-semiconductor block, 7-ceramic shell, 8-thermal electric plug, 9-connector. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] This utility model provides a self-temperature-controlled power battery box. Figure 1 A schematic diagram of a self-temperature-controlled power battery box according to an embodiment of the present invention is shown. (Refer to...) Figure 1 and Figure 2 The self-temperature controlled power battery box includes: a box body 1, a battery module 2, a heat conduction pipe 3, and a thermoelectric component 4. The box body 1 has an inner cavity, and the battery module 2, the heat conduction pipe 3, and the thermoelectric component 4 are all installed in the inner cavity of the box body 1.

[0031] In this embodiment, a box 1 with a rectangular cross-section is taken as an example. The box 1 includes a first inner wall and a second inner wall, a third inner wall and a fourth inner wall that are opposite to each other. Figure 1 In the example shown, the turning angle between the first inner wall, the third inner wall, the second inner wall, and the fourth inner wall is 90°. At the same time, the first inner wall and the second inner wall are set as the group of side walls with larger area among the internal side walls of the box 1, and the third inner wall and the fourth inner wall are set as the group of side walls with smaller area among the internal side walls of the box 1.

[0032] Considering the usage scenarios and design specifications of existing power system battery packs, which are mostly used in small mechanical equipment such as electric bicycles, a set of heat conduction pipes 3 is set up and placed between the first inner wall of the box 1 and the battery module 2, which can meet the heat dissipation requirements of conventional battery packs.

[0033] Meanwhile, thermoelectric components 4 are installed between the second, third, and fourth inner walls of the housing 1 and the battery module 2. Thermoelectric components 4, which have a lower thermal conductivity than the heat conduction pipe 3, are used to regulate the heat on other sides of the battery module 2. This results in equal distances between the battery module 2 and the second, third, and fourth inner walls, and the distance between the battery module 2 and the first inner wall is greater than the distance between the battery module 2 and the second, third, and fourth inner walls.

[0034] With the battery module 2 surrounded by the thermoelectric components 4 and heat conduction pipes 3 in three directions, the heat conduction pipes 3 serve as the main heat dissipation device for large-scale temperature control. The other directions of the battery module 2 are controlled by several thermoelectric components 4. While ensuring that the overall temperature inside the battery box is controlled, the temperature changes of the side of the battery module 2 that directly faces the heat conduction pipes 3 are consistent with the other sides that do not face the heat conduction pipes 3.

[0035] This application utilizes a thermoelectric module installed inside the battery pack. By employing the thermoelectric effect, when a temperature difference arises between the ambient temperature and the internal temperature, the thermoelectric module 4 heats the interior of the battery pack 1 through heat conduction with the pack 1. In low-temperature environments, it heats the interior of the pack 1, while in high-temperature environments, it cools the interior. Based on the heat-conducting pipe 3 as the primary temperature control device, the application simultaneously regulates the temperature of other components in the battery module 2. This effectively solves the problem of inconsistent temperature control in different locations of the battery module 2 within the pack 1 under varying temperature conditions. Furthermore, it reduces the impact of ambient temperature on the internal temperature of the pack 1, improving the temperature consistency of the battery modules 2 within the battery pack, thereby increasing the depth of charge / discharge and the battery's lifespan.

[0036] In this application, the temperature inside the box is controlled by adding a thermoelectric module 4. No new mechanical devices are needed, and no waste gas or other pollution is generated. The volume utilization rate is improved while the temperature difference is minimized. It can be directly processed and modified on the already produced battery box, and has strong practicality.

[0037] Specifically, refer to Figure 3 The thermoelectric component 4 uses a semiconductor cooling chip. The thermoelectric component 4 specifically includes: wire harness 5, semiconductor block 6, and ceramic housing 7.

[0038] The ceramic housing 7 has a linear strip structure. The ceramic housing 7 has a receiving groove for storing the semiconductor block 6, and one end of the ceramic housing 7 has a wire harness 5 for connecting the positive and negative terminals of the power supply.

[0039] exist Figure 3 In the example shown, the semiconductor blocks 6 are arranged in an array in the receiving groove of the ceramic housing 7, and the semiconductor blocks 6 adopt a bent wiring structure, which directly increases the heat-receiving area of ​​the thermoelectric component 4 and further improves the uniformity of heat transfer. The two wire harnesses 5 are arranged at the same end of the ceramic housing 7 in an upper and lower position. The wire harnesses 5 include a positive wire harness for connecting to the positive terminal of the power supply and a negative wire harness for connecting to the negative terminal of the power supply.

[0040] In this application, on the one hand, the temperature change of the thermoelectric component 4 can be precisely controlled by adjusting the magnitude of the power input current, and on the other hand, the heating or heat dissipation effect of the thermoelectric component 4 on the inside of the housing 1 can be adjusted by changing the positive and negative poles of the power supply.

[0041] Specifically, the ceramic housing 7 is composed of two grooved ceramic substrates fastened together, and the two substrates are sealed together with epoxy resin. Epoxy resin 8 is used to seal the two ceramic substrates. The epoxy resin 8 can deform according to the shape of the sealing surface, does not flow easily and has a certain degree of adhesion. It can effectively prevent internal gas or liquid leakage, prevent external dust, moisture, water, dirt and chemicals from entering, prevent mechanical vibration and impact damage, and also achieve sound insulation and heat insulation effects, thus improving the protection of the semiconductor block 6.

[0042] Specifically, temperature sensors are installed at the turning points of the first, second, third, and fourth inner walls of the housing 1, and these temperature sensors are electrically connected to the thermoelectric component 4. The temperature sensors monitor the temperature of the surrounding environment of the battery module 2. Preset values ​​can be set in advance according to actual needs. When the temperature difference between the temperature sensor on the side closer to the heat conduction pipe 3 and the temperature sensor on the side farther away from the heat conduction pipe 3 exceeds the preset value, the thermoelectric component 4 is activated, thereby improving the flexibility of temperature control inside the housing 1.

[0043] Meanwhile, this application also provides temperature sensors on the corresponding outer walls of the third and fourth inner walls of the housing 1 to monitor the temperature of the external environment of the battery housing. By calculating the difference between the external ambient temperature and the internal ambient temperature of the battery housing, the activation of the thermoelectric component 4 is determined.

[0044] In addition, the output and input ends of the heat conduction pipe 3 both penetrate the first inner wall of the housing 1 and are connected to the external refrigeration system. Temperature sensors are also installed on the first inner wall of the housing 1 next to the output and input ends of the heat conduction pipe 3, and the temperature sensors are electrically connected to the thermoelectric component 4. Based on the temperature control of the housing 1 using the heat conduction pipe 3, a certain difference will be generated between the input liquid temperature and the output liquid temperature of the heat conduction pipe 3. By using the temperature sensors to monitor the temperature of the output and input ends of the heat conduction pipe 3, the magnitude of the temperature control power of the heat conduction pipe 3 can be determined. A preset value can be set in advance according to actual needs. When the temperature difference between the output and input ends of the heat conduction pipe 3 exceeds the preset value, the thermoelectric component 4 is activated to perform auxiliary operation, thereby improving the efficiency of overall temperature control of the battery housing.

[0045] To further improve the heat transfer efficiency of the battery module 2 in this application, the battery module 2 includes a first module and a second module arranged symmetrically from left to right, with a gap between the first module and the second module. A thermoelectric plug 8 is also installed in the middle of the gap. The thermoelectric plug 8 is connected in series with the thermoelectric component 4 through a connector 9, thus avoiding the problem of too many wires.

[0046] Correspondingly, the thermoelectric component 4 is fixed to the second, third, and fourth inner walls of the housing 1 by adhesive bonding, and the thermoelectric plug 8 is fixed to the bottom inner wall of the housing 1 by adhesive bonding, so that the thermoelectric component and the thermoelectric plug 8 are in direct contact with the metal shell of the housing 1, which facilitates the transfer of heat from the internal environment of the housing 1 to the outer shell of the housing 1 by the thermoelectric component 4 and the thermoelectric plug 8 through heat conduction, thus facilitating the overall heat transfer effect of the housing 1.

[0047] Meanwhile, in order to ensure the heat dissipation efficiency of the enclosure 1 itself, the enclosure 1 is made of aluminum plate.

[0048] Based on the aforementioned battery housing, refer to Figure 4 and Figure 5 To illustrate the specific operation process of the battery box in this application, we will take a preset temperature difference of 5°C as an example.

[0049] A first temperature sensor 10 and a second temperature sensor 11 are respectively provided on the third inner wall and the fourth inner wall of the housing 1 at the end near the heat conduction pipe 3 and the end away from the heat conduction pipe 3. A third temperature sensor 12 is provided in the middle of the outer wall corresponding to the third inner wall and the fourth inner wall of the housing 1. A fifth temperature sensor 13 and a sixth temperature sensor 14 are respectively provided on the first inner wall of the housing 1 beside the output end and the input end of the heat conduction pipe 3.

[0050] First, if the temperature difference between the fifth temperature sensor 13 and the sixth temperature sensor 14 is greater than 5°C, then the thermoelectric assembly 4 will be activated.

[0051] If the temperature difference between the fifth temperature sensor 13 and the sixth temperature sensor 14 is not greater than 5°C, then the thermoelectric assembly 4 is turned off, and the temperature difference between the first temperature sensor 10 and the second temperature sensor 11 is determined.

[0052] If the temperature difference between the first temperature sensor 10 and the second temperature sensor 11 is greater than 5°C, the thermoelectric assembly 4 will be activated.

[0053] If the temperature difference between the first temperature sensor 10 and the second temperature sensor 11 is not greater than 5°C, then the thermoelectric assembly 4 is activated, and the temperature difference between the first temperature sensor 10, the second temperature sensor 11 and the third temperature sensor 12 is determined respectively.

[0054] If the temperature difference between the first temperature sensor 10, the second temperature sensor 11 and the third temperature sensor 12 is greater than 5°C, then the thermoelectric plug 8 is activated.

[0055] If the temperature difference between the first temperature sensor 10, the second temperature sensor 11 and the third temperature sensor 12 is not greater than 5°C, then the thermoelectric plug 8 is turned off.

[0056] In addition, staff can directly set the thermoelectric component 4 to heat or cool the environment inside the chamber 1 when the outside temperature is below 0℃ or above 30℃.

[0057] This application installs a thermoelectric module inside the battery box. Utilizing the thermoelectric effect, when a temperature difference arises between the ambient temperature and the temperature inside the box, the thermoelectric module 4 heats the inside of the box 1 through heat conduction with the box 1 in a low-temperature environment and cools the inside of the box 1 in a high-temperature environment. Based on the heat conduction pipe 3 as the main temperature control and regulation device, the temperature of other parts of the battery module 2 is simultaneously regulated.

[0058] On the one hand, it effectively solves the problem that the components of the battery module 2 in different positions inside the box 1 cannot be synchronously regulated under different temperature environments. On the other hand, it reduces the influence of the external ambient temperature on the internal ambient temperature of the box 1, which is conducive to improving the temperature consistency of the battery module 2 inside the battery pack, thereby improving the depth of charge and discharge and the service life of the battery.

[0059] On the other hand, temperature monitoring is performed on the output and input ends of the heat conduction pipe 3, which effectively reduces the temperature difference in different parts of the battery module 2, thereby improving the service life of the battery module 2 and reducing the voltage difference of the battery module 2 caused by the temperature difference.

[0060] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0061] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-temperature-controlled power battery box, characterized in that, include: The housing (1) and the battery module (2), heat conduction pipe (3), and thermoelectric component (4) built into the inner cavity of the housing (1); The housing (1) includes a first inner wall and a second inner wall, a third inner wall and a fourth inner wall that are opposite to each other, and the heat conduction pipe (3) is disposed between the first inner wall of the housing (1) and the battery module (2); Thermoelectric components (4) are provided between the second inner wall, the third inner wall, and the fourth inner wall of the housing (1) and the battery module (2). The thermoelectric components (4) in the three directions, together with the heat conduction pipe (3), surround the battery module (2).

2. The power battery box according to claim 1, characterized in that, The thermoelectric component (4) uses a semiconductor cooling chip, specifically including: a wire harness (5), a semiconductor block (6), and a ceramic housing (7); The ceramic housing (7) has a linear strip structure. The ceramic housing (7) has a receiving groove for storing the semiconductor block (6). One end of the ceramic housing (7) is provided with a wire harness (5) for connecting the positive and negative terminals of the power supply. The wire harness (5) includes a positive wire harness for connecting the positive terminal of the power supply and a negative wire harness for connecting the negative terminal of the power supply.

3. The power battery box according to claim 2, characterized in that, The ceramic shell (7) is composed of two ceramic substrates with grooves fastened together, and the two ceramic substrates are sealed and connected by epoxy resin.

4. The power battery box according to claim 1, characterized in that, Temperature sensors are provided at the turning points of the first, second, third, and fourth inner walls of the housing (1), and the temperature sensors are electrically connected to the thermoelectric assembly (4).

5. The power battery box according to claim 4, characterized in that, Temperature sensors are provided on the corresponding outer walls of the third inner wall and the fourth inner wall of the box (1).

6. The power battery box according to claim 1, characterized in that, The output and input ends of the heat-conducting pipe (3) both penetrate the first inner wall of the box (1) and are connected to the external refrigeration system. Temperature sensors are provided on the first inner wall of the box (1) on both the output and input ends of the heat-conducting pipe (3), and the temperature sensors are electrically connected to the thermoelectric component (4).

7. The power battery box according to claim 1, characterized in that, The battery module (2) includes a first module and a second module arranged symmetrically from left to right, with a gap between the first module and the second module, and a thermoelectric plug (8) is installed in the center of the gap.

8. The power battery box according to claim 7, characterized in that, The thermoelectric plug (8) is connected in series with the thermoelectric component (4) via a connector (9).

9. The power battery box according to claim 8, characterized in that, The thermoelectric component (4) is fixed to the second, third and fourth inner walls of the housing (1) by adhesive bonding, and the thermoelectric plug (8) is fixed to the bottom inner wall of the housing (1) by adhesive bonding.

10. The power battery box according to any one of claims 1-9, characterized in that, The enclosure (1) is made of aluminum plate.

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