Battery pack with uniform heating function

Abstract

The invention relates to the technical field of battery heating, in particular to a uniform heating battery pack used in a low-temperature environment. In the prior art, non-uniform heating is easily caused by a mode of wrapping a battery cell by a conventional heating film, and the performance and the service life of the battery are influenced. In order to solve the problem, the uniform heating battery pack provided by the invention comprises a battery pack, a conductive part and a heating element, the battery pack is composed of a plurality of battery cells, and each battery cell is provided with a pole. And the conductive piece is electrically connected with the pole of the battery cell. And the heating element is thermally coupled with the conductive part, covers the surface of the conductive part and is used for heating the battery cell through the conductive part and the pole. According to the structural design, heat is quickly and uniformly transferred to each battery cell through the conductive piece and the pole, so that the problem of non-uniform heating of the battery pack in a low-temperature environment is solved, the overall performance of the battery pack is improved, the service life of the battery pack is prolonged, and meanwhile, the working efficiency and reliability of the battery pack in the low-temperature environment are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery heating, and in particular to a battery pack for uniformly heating in a low temperature environment. Background Art

[0002] With the development of new energy technologies, battery packs are widely used in various application scenarios. However, in low temperature environments, the performance of battery packs will be significantly affected. In the prior art, heating films are usually used to improve the performance of battery packs under low temperature conditions, but this method has some problems.

[0003] First, the way conventional heating films wrap the battery cells easily leads to uneven contact. This uneven contact will cause different degrees of heating of each battery cell, resulting in a large temperature difference between the battery cells. The temperature difference will not only reduce the overall efficiency of the battery pack, but also have a negative impact on the service life of the battery.

[0004] Secondly, due to the uneven contact between the heating film and the cells in the battery pack, it is difficult for the control system to accurately collect temperature information. This leads to inaccurate temperature control and the heating effect is difficult to achieve as expected.

[0005] In addition, existing heating methods often require a long heating time to make the battery pack reach the ideal operating temperature. In a low temperature environment, this slow heating process will delay the normal use time of the battery pack and affect the overall working efficiency of the equipment.

[0006] Finally, uneven heating may also cause local hot spots inside the battery pack, which will not only affect battery performance but also pose potential safety hazards. Summary of the invention

[0007] The object of the present invention is to provide a battery pack with uniform heating, which heats the battery cells through the poles, so as to solve the problem of uneven heating of the battery pack in a low temperature environment in the prior art.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] A uniformly heated battery pack comprises a battery pack, a conductive member and a heating element. The battery pack is composed of a plurality of battery cells, each of which has a pole. The conductive member is electrically connected to the pole of the battery cell. The heating element is thermally coupled to the conductive member and covers the surface of the conductive member, and is used to heat the battery cell through the conductive member and the pole.

[0010] Furthermore, the conductive member has an integrated heat-conducting structure.

[0011] Specifically, the conductive member is a nickel strip, and the nickel strip is directly connected to the pole of the battery cell.

[0012] More specifically, the nickel strip includes a bottom nickel strip, a top middle nickel strip and top two side nickel strips, wherein the bottom nickel strip is connected to the bottom pole of the battery cell, and the top middle nickel strip and the top two side nickel strips are connected to the top pole of the battery cell.

[0013] Furthermore, the heating units of the heating element are arranged symmetrically and matched with the surface shape of the conductive member.

[0014] Furthermore, the heat generating units of the heating element have a lower density in the central area of ​​the battery pack.

[0015] In addition, the uniformly heated battery pack further comprises a control circuit, which is thermally coupled to the battery pack via a temperature sensor and is used to monitor the temperature of the battery pack and control the heating power of the heating element.

[0016] Furthermore, the uniformly heated battery pack also includes an insulating layer, which is arranged between the control circuit and the heating element for electrical isolation.

[0017] In addition, the battery cells in the battery pack are in a series-parallel structure, and adjacent battery cells are electrically connected through the conductive member.

[0018] Finally, the number of the nickel strips is adjusted according to the number of the battery cells, and each of the battery cells is connected to at least one nickel strip.

[0019] The beneficial effects of the present invention are:

[0020] The present invention improves the performance and reliability of the battery pack in low temperature environments through structural design and material selection. The heating element is thermally coupled to the conductive part and covered on the surface of the conductive part, thereby achieving the goal of heating the battery cell through the pole. This design utilizes the internal structure of the battery and does not require an additional heating device, which simplifies the overall structure and reduces heat loss. Heat is transferred to each battery cell through the conductive part and the pole, improving the problem of uneven heat distribution. Uniform heating improves heating efficiency, reduces temperature gradients between battery cells, and reduces battery performance differences and life loss caused by uneven temperature. By controlling the temperature of the battery cell, this design improves the charging and discharging performance of the battery pack in low temperature environments, extends the battery life, and improves the energy utilization efficiency of the system. This improvement has practical significance for application fields with high requirements for low temperature performance, such as electric vehicles and energy storage systems, and can improve the applicability and reliability of products in cold climates.

[0021] The present invention adopts multiple designs to optimize the heating effect and control accuracy. The conductive part of the integrated heat-conducting structure adopts nickel strip as the material to improve the heat conduction efficiency. The combined design of the bottom nickel strip, the top middle nickel strip and the top two nickel strips realizes the connection with the battery cell pole, creates a multi-path heat conduction channel, and improves the speed and uniformity of heat transfer. The design of the heating element pays special attention to practicality and efficiency: the density of the heating unit is low in the middle area, while the density is high at both ends. This distribution has two functions: first, it specifically strengthens the heating at both ends of the battery pack, compensates for the faster heat dissipation speed at both ends, and ensures that the temperature distribution of the entire battery pack is more uniform; second, the higher density design at both ends facilitates bending when assembling the battery pack, which improves the processability and assembly efficiency of the product. The control circuit and temperature sensor system can monitor the temperature distribution of the battery pack and adjust the heating power. This temperature control system improves the accuracy of heating, can be adjusted according to the use scenario and environmental conditions, and improves the adaptability and work efficiency of the battery pack in low temperature environment. Accurate temperature control helps to reduce energy consumption, extend battery life, and improve the safety performance of the system. The combination of these designs enables the battery pack to be efficiently heated in low-temperature environments while taking into account practicality in the production process, improving the performance, reliability, service life and production efficiency of the battery pack, and providing technical support for fields such as electric transportation and renewable energy storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of a battery pack in one embodiment of the present invention,

[0023] Figure 2 This is a first exploded schematic diagram of a battery pack according to an embodiment of the present invention.

[0024] Figure 3 is a schematic structural diagram of a conductive member in one embodiment of the present invention,

[0025] Figure 4 FIG. 2 is a second exploded schematic diagram of a battery pack according to an embodiment of the present invention.

[0026] In the figure: 1. battery pack, 11. battery cell, 12. pole, 2. conductive part, 21. bottom nickel strip, 22. top middle nickel strip, 23. top two side nickel strips, 3. heating element, 6. insulating layer, 81. outer shell, 82. foam, 83. PCB board, 84. epoxy board. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the described embodiments are only used to explain the technical principles of the present invention, rather than to limit the scope of protection thereof. Those skilled in the art should understand that, without departing from the spirit and scope of the present invention, various changes, modifications or equivalent substitutions may be made to these embodiments. These changes, modifications or equivalent substitutions shall all be deemed to fall within the scope of protection defined by the claims of the present invention.

[0028] The embodiments described herein are only preferred embodiments of the present invention and do not cover all possible variants and modifications. The embodiments of the present invention can be appropriately adjusted according to specific application scenarios and technical requirements. For example, the number of cells in the battery pack, the arrangement, the specific structure of the conductive parts, the material selection of the heating elements, etc. can all be adjusted according to actual needs. These adjustments will not change the core technical idea of ​​the present invention, that is, to achieve uniform heating of the cells through conductive parts and poles.

[0029] like Figure 1 and Figure 2 As shown, a uniformly heated battery pack provided by the present invention comprises a battery pack 1, a conductive member 2 and a heating element 3. The battery pack 1 is composed of a plurality of battery cells 11, each of which has a pole 12. The conductive member 2 is electrically connected to the battery cells 11 in the battery pack 1. The heating element 3 is thermally coupled to the conductive member 2 and covers the surface of the conductive member 2.

[0030] The conductive member 2 has an integrated heat-conducting structure. Figure 3 As shown, the conductive member 2 is a nickel strip, including a bottom nickel strip 21, a top middle nickel strip 22, and top two side nickel strips 23. The bottom nickel strip 21 is connected to the pole 12 at the bottom of the battery cell 11, and the top middle nickel strip 22 and the top two side nickel strips 23 are connected to the pole 12 at the top of the battery cell 11. Preferably, the thickness of the nickel strip is 0.2 mm to 0.5 mm. This design ensures that both the positive and negative electrodes of the battery cell 11 can be effectively heated.

[0031] The heating units of the heating element 3 are arranged symmetrically and are adapted to the surface shape of the conductive member 2. In this embodiment, the heating element 3 is preferably a heating film, specifically a flexible heating film. The material of the heating film can be a high temperature resistant and insulating material such as polyimide (PI) or polyethylene terephthalate (PET) as a substrate, and a heating circuit is formed by printing or etching on the substrate. Preferably, the thickness of the heating film is 0.1 mm to 0.5 mm, and the power density is 0.2 W / cm 2 Up to 1W / cm 2The density of the heating units of the heating element 3 is relatively low in the central area of ​​the battery pack 1. This design can avoid overheating in the central area and achieve a more uniform temperature distribution.

[0032] like Figure 4 As shown, the battery pack of the present invention further includes a shell 81, a foam 82, a PCB board 83 and an epoxy board 84. The shell 81 is used to accommodate and protect the entire battery pack structure. The foam 82 can provide buffering and heat insulation. The PCB board 83 is used to install a control circuit (not shown in the figure). The epoxy board 84 is used as an insulating layer 6, which is arranged between the PCB board 83 and the heating element 3 for electrical isolation.

[0033] The battery pack of the present invention further includes a control circuit and a temperature sensor (neither of which is shown in the figure). The control circuit is thermally coupled to the battery pack 1 through the temperature sensor to monitor the temperature of the battery pack 1 and control the heating power of the heating element 3. The temperature sensor can be set at multiple positions on the surface of the battery cell 11 to accurately monitor the temperature distribution of the battery pack 1. The control circuit dynamically adjusts the heating power of the heating element 3 according to the monitored temperature data to achieve precise temperature control.

[0034] The battery cells 11 in the battery pack 1 are in a series-parallel structure, and adjacent battery cells 11 are electrically connected through the conductive member 2. This structure can flexibly adjust the output voltage and capacity of the battery pack according to actual application requirements.

[0035] The number of the nickel strips is adjusted according to the number of the battery cells 11, and each battery cell 11 is connected to at least one nickel strip. In this embodiment, for a battery pack with 16 battery cells, 4 bottom nickel strips 21, 3 top middle nickel strips 22, and 2 top side nickel strips 23 are used.

[0036] The working principle of the battery pack of the present invention is as follows: when the battery pack is in a low temperature environment, the control circuit detects through the temperature sensor that the temperature of the battery pack 1 is lower than a preset threshold, and then starts the heating element 3. The heat generated by the heating element 3 is evenly transferred to each of the battery cells 11 through the conductive member 2 and the pole 12. Since the conductive member 2 adopts an integrated heat-conducting structure, the heat transfer efficiency is high, and the temperature of the battery cell 11 can be quickly increased. At the same time, the symmetrical arrangement of the heating units of the heating element 3 and the low-density design of the central area ensure that the temperature distribution of the entire battery pack 1 is uniform. The control circuit dynamically adjusts the heating power according to the real-time monitored temperature data until the battery pack 1 reaches the optimal operating temperature.

[0037] The assembly method of the battery pack of the present invention is a common method used by those skilled in the art and will not be described in detail.

[0038] The beneficial effects of the present invention are as follows:

[0039] By thermally coupling the heating element with the conductive part and covering the surface of the conductive part, the purpose of heating the battery cell through the pole is achieved, and the battery pack is heated evenly. This structure allows heat to be quickly and evenly transferred to each battery cell through the conductive part and the pole, solving the problem of uneven heating of the battery pack in a low temperature environment and improving the overall performance and service life of the battery pack.

[0040] The conductive parts with integrated heat-conducting structure are used, and nickel strips are used as conductive parts. Through the combination of the bottom nickel strip, the top middle nickel strip and the top two nickel strips, close connection with the battery pole and efficient heat conduction are achieved. The symmetrical arrangement of the heating element heating unit and the low-density design of the central area, combined with the use of control circuits and temperature sensors, optimize the heating effect, so that the battery pack can quickly and evenly heat the battery cell through the pole in a low-temperature environment, improving the working efficiency and reliability of the battery pack in a low-temperature environment.

[0041] Through this design, the battery pack of the present invention can be heated quickly and evenly in a low temperature environment, effectively improving the overall performance and service life of the battery pack, while also improving the working efficiency and reliability of the battery pack in a low temperature environment. The beneficial effects of the present invention are as follows:

[0042] By using the heating film as the heating element, the battery pack of the present invention can achieve a more compact structural design while ensuring the uniformity and efficiency of heating. The flexible characteristics of the heating film enable it to better adapt to the complex structure inside the battery pack, improving the overall heating effect and heat conduction efficiency.

[0043] The conductive parts with integrated heat-conducting structure are used, and nickel strips are used as conductive parts. Through the combination of the bottom nickel strip, the top middle nickel strip and the top two nickel strips, close connection with the battery pole and efficient heat conduction are achieved. The symmetrical arrangement of the heating element heating unit and the low-density design of the central area, combined with the use of control circuits and temperature sensors, optimize the heating effect, so that the battery pack can quickly and evenly heat the battery cell through the pole in a low-temperature environment, improving the working efficiency and reliability of the battery pack in a low-temperature environment.

[0044] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and variations. These changes and variations may include, but are not limited to: optimized design of the battery pack structure, application of new materials, improvement of the heating control algorithm, integration with other battery management systems, etc. As long as these changes and variations do not change the core technical idea of ​​the present invention, that is, achieving uniform heating of the battery cell through conductive parts and poles, they should be regarded as part of the scope of protection of the present invention.

Claims

1. A uniformly heated battery pack, characterized in that: include: A battery pack, consisting of a plurality of battery cells, each of which has a pole; A conductive member electrically connected to the electrode of the battery cell; A heating element is thermally coupled to the conductive member and covers the surface of the conductive member, and is used to heat the battery cell through the conductive member and the pole.

2. The uniformly heated battery pack according to claim 1, characterized in that: The conductive member includes a plurality of integrated heat-conducting structures.

3. The uniformly heated battery pack according to claim 2, characterized in that: The conductive member is a nickel strip, and the nickel strip is directly connected to the pole of the battery cell.

4. The uniformly heated battery pack according to claim 3, characterized in that: The nickel strip includes a bottom nickel strip, a top middle nickel strip and top two side nickel strips, wherein the bottom nickel strip is connected to the bottom pole of the battery cell, and the top middle nickel strip and the top two side nickel strips are connected to the top pole of the battery cell.

5. The uniformly heated battery pack according to claim 1, characterized in that: The heating units of the heating element are arranged symmetrically and matched with the surface shape of the conductive member.

6. The uniformly heated battery pack according to claim 5, characterized in that: The heat generating units of the heating element have a lower density in the central area of ​​the battery pack.

7. The uniformly heated battery pack according to claim 1, characterized in that: The device also includes a control circuit, which is thermally coupled to the battery pack via a temperature sensor and is used to monitor the temperature of the battery pack and control the heating power of the heating element.

8. The uniformly heated battery pack according to claim 7, characterized in that: It also includes an insulating layer, which is arranged between the control circuit and the heating element for electrical isolation.

9. The uniformly heated battery pack according to claim 1, characterized in that: The battery cells in the battery pack are in a series-parallel structure, and adjacent battery cells are electrically connected through the conductive member.

10. The uniformly heated battery pack according to claim 3, characterized in that: The number of the nickel strips is adjusted according to the number of the battery cells, and each of the battery cells is connected to at least one nickel strip.

Images