Battery pack and electric equipment
By setting phase change materials in the battery case to absorb and store the heat of the circuit module, the heat dissipation problem of the circuit module is solved, and the working reliability and stability of the circuit module are improved.
Patent Information
- Application Number
- CN202421685946.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-16
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-07-16
AI Technical Summary
The heat generated by the circuit module during the charging and discharging of the battery pack cannot be effectively dissipated, affecting its normal working reliability.
A phase change material is provided in the case of the battery pack, and the heat generated by the heating device is absorbed and phase changed, thereby delaying the heating of the heating device and dissipating heat outward through the shell to achieve effective heat dissipation.
The working reliability of the circuit module is improved, heat is absorbed and stored through the phase change process of the phase change material, the temperature of the heating device is reduced, and the stable operation of the circuit module is ensured.
Smart Images
Figure CN223167524U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, and more particularly, to a battery pack and an electrical device. Background Art
[0002] As an energy storage device, a battery pack can supply electrical energy to a load. In the related art, the battery pack includes a battery module and a circuit module electrically connected to the battery module, and the circuit module has a battery management system for managing the battery module. During the charging and discharging process of the battery pack, the circuit module generates heat, resulting in an increase in the temperature of the circuit module, which may affect the normal operation of the circuit module. Therefore, how to dissipate the heat of the circuit module has become a technical problem to be solved. Summary of the Utility Model
[0003] Embodiments of the present utility model provide a battery pack and an electrical device.
[0004] The battery pack according to the embodiment of the present application includes a housing, a battery module, and a circuit module. The battery module and the circuit module are both disposed in the housing. The circuit module is disposed between the battery module and the housing. The circuit module includes a heating device, and the heating device is thermally connected to the housing. Wherein, a closed accommodating cavity is formed on the outer surface of the housing, and a phase change material is disposed in the accommodating cavity.
[0005] In the battery pack according to the embodiment of the present application, a phase change material is disposed in the accommodating cavity of the housing. The phase change material can absorb the heat generated by the heating device and undergo a phase change, delaying the temperature rise of the heating device. Moreover, the housing can dissipate heat outward, so that the heating device can effectively dissipate heat, improving the reliability of the operation of the circuit module.
[0006] In some embodiments, the phase change material is at least one of paraffin wax and hydrated salt.
[0007] In some embodiments, the melting point of the phase change material is 45 ± 3 °C.
[0008] In some embodiments, the thermal conductivity of the phase change material is 1.5 - 3 W / (mK).
[0009] In some embodiments, the housing includes a body and a protrusion disposed on the outer surface of the body. The protrusion is strip-shaped and the accommodating cavity is formed inside.
[0010] In some embodiments, the number of the protrusions is multiple, and the multiple protrusions are arranged along the circumferential direction of the body.
[0011] In some embodiments, the heating device includes a MOS transistor.
[0012] In some embodiments, the battery pack includes a heat conducting member that connects the heat generating device and the housing.
[0013] In some embodiments, the battery module includes a plurality of battery cells arranged in an array, and the circuit module is disposed on one side of the battery cells in the lateral direction.
[0014] The electrical equipment according to the embodiments of the present application includes the battery pack described in any one of the above embodiments.
[0015] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. Description of the Drawings
[0016] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, where:
[0017] Figure 1 is a perspective schematic view of the battery pack according to the embodiment of the present utility model;
[0018] Figure 2 is an exploded schematic view of the battery pack according to the embodiment of the present utility model;
[0019] Figure 3 is a cross-sectional schematic view of the battery pack according to the embodiment of the present utility model;
[0020] Figure 4 is an enlarged schematic view of a partial cross-section of the battery pack according to the embodiment of the present utility model.
[0021] Description of the Reference Numerals:
[0022] 100 - battery pack, 10 - housing, 11 - accommodation cavity, 12 - body, 13 - protrusion, 20 - battery module, 21 - battery cell, 30 - circuit module, 31 - heat generating device, 32 - circuit board, 40 - phase change material, 50 - heat conducting member. Detailed Embodiments
[0023] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present utility model and should not be construed as limiting the present utility model.
[0024] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.
[0025] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between various embodiments and / or settings discussed. In addition, the present utility model provides examples of various specific processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.
[0026] Please refer to Figures 1-4 , the battery pack 100 of the embodiment of the present application includes a housing 10, a battery module 20 and a circuit module 30. The battery module 20 and the circuit module 30 are both disposed in the housing 10. The circuit module 30 is disposed between the battery module 20 and the housing 10. The circuit module 30 includes a heating device 31, and the heating device 31 is thermally connected to the housing 10. Wherein, a closed accommodating cavity 11 is formed on the outer surface of the housing 10, and a phase change material 40 is disposed in the accommodating cavity 11.
[0027] In the battery pack 100 of the embodiment of the present application, the phase change material 40 is disposed in the accommodating cavity 11 of the housing 10. The phase change material 40 can absorb the heat generated by the heating device 31 and undergo a phase change, delaying the temperature rise of the heating device 31, and the housing 10 can dissipate heat outward, so that the heating device 31 can effectively dissipate heat and improve the reliability of the operation of the circuit module 30.
[0028] Specifically, at least a part of the housing 10 can be made of a metal material so that the housing 10 has better heat conduction performance. For example, the housing 10 can be made of a metal material such as aluminum, aluminum alloy, stainless steel, etc. The housing 10 can be set to a regular shape such as a square according to different applications, or can also be set to an irregular shape. The housing 10 can be partially of a hollow structure to form the accommodating cavity 11. The cross-sectional shape of the accommodating cavity 11 includes but is not limited to shapes such as a circle and a square.
[0029] The battery module 20 is the main energy storage component of the battery pack 100. The battery module 20 can be a lithium battery module or other types of modules. The battery module 20 can include a plurality of battery cells 21, and the plurality of battery cells 21 can be fixed together by fixing members. The plurality of battery cells 21 can be connected in series and / or in parallel to increase the power of the battery module 20.
[0030] The circuit module 30 can include a circuit board 32 and a plurality of components disposed on the circuit board 32. The components can include the heat generating device 31 mentioned above. The circuit module 30 can form a battery management system (BMS) of the battery pack 100 to monitor the health status of the battery module 20 and improve the performance such as the service life and safety of the battery pack 100.
[0031] It can be understood that during the charging or discharging process of the battery pack 100, the heat generating device 31 may generate a large amount of heat due to being frequently turned on or off. If this heat is not dissipated in time, it may affect the normal operation of the heat generating device 31. In this regard, the heat generating device 31 is thermally connected to the housing 10, that is to say, the heat generated by the heat generating device 31 can be transferred to the housing 10 to dissipate heat to the surrounding environment through the housing 10, thereby achieving a heat dissipation effect.
[0032] Furthermore, the phase change material 40 in the accommodation cavity 11 of the housing 10 can be in a solid state at room temperature (25°C). In the initial stage when the heat generating device 31 generates heat, after the phase change material 40 absorbs the heat emitted by the heat generating device 31, it transforms from a solid state to a liquid state, thereby absorbing and storing the heat emitted by the heat generating device 31, and further achieving the effect of dissipating heat from the heat generating device 31.
[0033] It should be noted that after the phase change material 40 is completely in a liquid state, the heat of the heat generating device 31 and the phase change material 40 can still be dissipated to the surrounding environment through the housing 10, thereby continuously dissipating heat from the heat generating device 31.
[0034] In some embodiments, the housing 10 can include a plurality of detachably connected parts to make the battery pack 100 easier to assemble.
[0035] In some embodiments, the phase change material 40 is at least one of paraffin wax and hydrated salt. In this way, paraffin wax or hydrated salt is a relatively easily obtainable phase change material 40, which can reduce the cost of the battery pack 100. Paraffin wax can be selected as pure paraffin wax or modified insulating paraffin wax to improve the safety during the manufacturing process of the battery pack 100 and reduce the risk of short-circuit connection with the circuit module 30 after paraffin wax overflows. The hydrated salt-based phase change material is, for example, sodium acetate trihydrate.
[0036] In some embodiments, the melting point of the phase change material 40 is 45 ± 3°C. For example, the melting point of the phase change material 40 can be 42°C, 43°C, 45°C, 47°C, 48°C or other temperatures. In this way, the melting point of the phase change material 40 is relatively low, which can better absorb the heat emitted by the heat generating device 31.
[0037] In some embodiments, the thermal conductivity of the phase change material 40 is 1.5 - 3 W / (mK). For example, the thermal conductivity of the phase change material 40 is 1.5 W / (mK), 2 W / (mK), 2.5 W / (mK), 3 W / (mK) or other thermal conductivities. In this way, the thermal conductivity of the phase change material 40 is relatively small, and it is easy to store the absorbed heat.
[0038] Please refer to Figure 4 , in some embodiments, the housing 10 includes a body 12 and a protrusion 13 provided on the outer surface of the body 12. The protrusion 13 is strip-shaped and has an accommodation cavity 11 formed therein. In this way, the protrusion 13 can increase the surface area of the housing 10, thereby improving the heat dissipation ability of the housing 10. In addition, the accommodation cavity 11 is formed in the protrusion 13, making the housing 10 easier to manufacture. Moreover, the heat released when the phase change material 40 transforms from a liquid state to a solid state is more easily dissipated to the surrounding environment through the protrusion 13, and is not easily dissipated into the housing 10, which is beneficial to improving the heat dissipation efficiency of the housing 10.
[0039] Specifically, the body 12 can be cylindrical. The protrusion 13 is provided on the circumferential surface of the body 12. The cross-sectional shape of the outer contour of the protrusion 13 can be trapezoidal, rectangular or other shapes. The phase change material 40 is stored in the protrusion 13, so that the heat dissipation body can form a stable temperature difference with the natural environment, and the radiation heat dissipation efficiency is increased.
[0040] Please refer to Figure 4 , in some embodiments, the number of the protrusions 13 is multiple, and the multiple protrusions 13 are arranged along the circumferential direction of the body 12. In this way, the multiple protrusions 13 increase the surface area of the housing 10, thereby improving the heat dissipation efficiency of the housing 10.
[0041] Specifically, the structures of all the protrusions 13 can be the same, or completely different or partially the same. An accommodation cavity 11 can be formed in each protrusion 13, or an accommodation cavity 11 can be formed in some of the protrusions 13.
[0042] In some embodiments, the heat generating device 31 includes a MOS transistor. During the charging and discharging process of the battery pack 100, the MOS transistor may be frequently turned off and carry current, generating a large amount of heat, and the heat dissipation requirement is the most urgent. Therefore, the housing 10 containing the phase change material 40 can dissipate heat from the MOS transistor, improving the stability of the normal operation of the MOS transistor.
[0043] Of course, in other embodiments, the heat generating device 31 can also be a device such as a capacitor or an inductor.
[0044] Please refer to Figures 2-4 In some embodiments, the battery pack 100 includes a heat conducting member 50, and the heat conducting member 50 is connected to the heat generating device 31 and the housing 10. In this way, the heat conducting body can transfer the heat of the heat generating device 31 to the housing 10 more efficiently, so that the housing 10 can dissipate the heat to the surrounding environment, thereby reducing the temperature rise of the heat generating device 31.
[0045] Specifically, the heat conducting member 50 is, for example, a heat conducting silica gel pad, and the heat conducting member 50 can be closely attached to the heat generating device 31 to increase the connection area between the heat conducting member 50 and the heat generating device 31 and improve the heat conduction efficiency of the heat conducting member 50.
[0046] Please refer to Figure 2 In some embodiments, the battery module 20 includes a plurality of battery cells 21 arranged in an array, and the circuit module 30 is disposed on one side of the battery cells 21 in the lateral direction. Generally, conductive terminals for conducting electricity are provided longitudinally on the battery cells 21. Therefore, by disposing the circuit module 30 on one side of the battery cells 21 in the lateral direction, the risk of interference between the circuit module 30 and the battery cells 21 can be reduced. In addition, this can also avoid the battery pack 100 having too large a dimension along the longitudinal direction of the battery cells 21 and can reduce the requirement of the battery pack 100 for the placement space.
[0047] The electrical device according to the embodiment of the present application includes the battery pack 100 of any one of the above embodiments. The electrical device includes, but is not limited to, vehicles, electrical devices, etc. Among them, the vehicle can be a motor home, an SUV or other vehicle models. The battery pack 100 can be used as a backup power source for the vehicle or can provide driving power for the vehicle.
[0048] In the description of the embodiments of the present utility model, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present utility model, "a plurality" means two or more unless otherwise specifically defined.
[0049] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.
[0050] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.
Claims
1. A battery pack, characterized in that, Comprising: A housing; A battery module and a circuit module, both the battery module and the circuit module are disposed in the housing, the circuit module is disposed between the battery module and the housing, the circuit module includes a heating device, the heating device is thermally connected to the housing, wherein, a closed accommodating cavity is formed on the outer surface of the housing, and a phase change material is disposed in the accommodating cavity.
2. The battery pack according to claim 1, characterized in that, The phase change material is at least one of paraffin wax and hydrated salt.
3. The battery pack according to claim 1, characterized in that, The melting point of the phase change material is 45 ± 3 °C.
4. The battery pack according to claim 1, wherein The thermal conductivity of the phase change material is 1.5 - 3 W / (mK).
5. The battery pack according to claim 1, wherein, The housing includes a body and a protrusion disposed on the outer surface of the body, the protrusion is strip-shaped and the accommodating cavity is formed inside.
6. The battery pack according to claim 5, characterized in that, The number of the protrusions is multiple, and the multiple protrusions are arranged along the circumferential direction of the body.
7. The battery pack according to claim 1, characterized in that, The heating device includes a MOS transistor.
8. The battery pack according to claim 1, wherein The battery pack includes a heat conducting member, and the heat conducting member connects the heating device and the housing.
9. The battery pack according to claim 1, characterized in that, The battery module includes a plurality of battery cells arranged in an array, and the circuit module is disposed on one side of the battery cells in the lateral direction.
10. An electrical device, characterized in that, A battery pack comprising any one of claims 1 - 9.