Battery pack and electric equipment

Abstract

The embodiment of the utility model provides a battery pack and electric equipment, and relates to the technical field of energy storage. The battery pack comprises a battery module, a thermoelectric device and a heat dissipation device, the thermoelectric device comprises a first binding surface and a second binding surface which are oppositely arranged, and the first binding surface is connected with the battery module through a first conducting layer; and the heat dissipation device is connected with the second binding surface of the thermoelectric device through the second conducting layer. According to the embodiment of the invention, the heat exchange efficiency of the thermoelectric device can be improved, and the safety of the battery pack is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of energy storage, and in particular, to a battery pack and an electrical device. Background Art

[0002] In order to adapt to different working environments, the battery pack of an electrical device (such as a vehicle) usually includes a heat exchange device, and the heat exchange device is used for heat exchange with the battery pack.

[0003] The current heat exchange device usually includes a thermoelectric device and a heat dissipation device. Among them, the thermoelectric device is arranged on the battery pack and is used for heat exchange with the battery pack; the heat dissipation device is arranged on the thermoelectric device and is used to improve the heat exchange efficiency of the thermoelectric device.

[0004] However, the above-mentioned thermoelectric device has the defect of poor heat exchange efficiency, which reduces the safety of the battery pack. Utility Model Content

[0005] In view of the above problems, the embodiments of the present application provide a battery pack and an electrical device, which can improve the heat exchange efficiency of the thermoelectric device and thus improve the safety of the battery pack.

[0006] In order to achieve the above object, the embodiments of the present application provide the following technical solutions:

[0007] The first aspect of the embodiments of the present application provides a battery pack, which includes:

[0008] A battery module;

[0009] A thermoelectric device, the thermoelectric device includes a first bonding surface and a second bonding surface arranged opposite to each other, and the first bonding surface is connected to the battery module through a first conduction layer;

[0010] A heat dissipation device, the heat dissipation device is connected to the second bonding surface of the thermoelectric device through a second conduction layer.

[0011] In a possible implementation manner, the thermoelectric device includes a first substrate, a second substrate, and a semiconductor thermocouple arranged between the first substrate and the second substrate. The surface of the first substrate facing away from the second substrate constitutes the first bonding surface, and the surface of the second substrate facing away from the first substrate constitutes the second bonding surface;

[0012] The semiconductor thermocouple includes a first state and a second state. When the semiconductor thermocouple is in the first state, it is used to cool the battery module, and when the semiconductor thermocouple is in the second state, it is used to heat the battery module.

[0013] In a possible implementation, the semiconductor thermocouple includes a thermoelectric material layer, and a first electrode layer and a second electrode layer respectively disposed on both sides of the thermoelectric material layer;

[0014] Wherein, the thermoelectric material layer includes a plurality of P-type semiconductors and a plurality of N-type semiconductors, and the plurality of P-type semiconductors and the plurality of N-type semiconductors are alternately and spaced apart.

[0015] In a possible implementation, both the first conduction layer and the second conduction layer include a heat conduction pad or a heat conduction adhesive.

[0016] In a possible implementation, the battery module includes a plurality of battery packs, and a barrier layer is disposed between adjacent battery packs.

[0017] In a possible implementation, the heat dissipation device includes a plurality of heat dissipation fins, and the plurality of heat dissipation fins are spaced apart and disposed on the second conduction layer.

[0018] In a possible implementation, the battery pack further includes a box body, and the battery module, the thermoelectric device and the heat dissipation device are stacked and disposed in the box body;

[0019] A heat dissipation fan is disposed on the inner wall of the box body.

[0020] In a possible implementation, the box body includes an air inlet and an air outlet which are oppositely disposed; the heat dissipation fan is disposed at the air outlet.

[0021] In a possible implementation, a filter element is disposed at both the air inlet and / or the air outlet.

[0022] In the second aspect of the embodiments of the present application, an electrical device is provided, which includes an electrical device and the battery pack described in the first aspect, and the battery pack is electrically connected to the electrical device for supplying electrical energy to the electrical device.

[0023] In the battery pack and the electrical device provided by the embodiments of the present application, by providing a first conduction layer between the thermoelectric device and the battery module, and a second conduction layer between the thermoelectric device and the heat dissipation device, and using the first conduction layer and the second conduction layer for heat conduction, the heat generated by the battery module can be effectively transferred to the heat dissipation device, thereby improving the heat dissipation efficiency, keeping the battery module within a suitable working temperature range, extending the service life of the battery module, and further extending the service life of the battery pack.

[0024] In addition to the technical problems solved by the embodiments of the present application described above, the technical features constituting the technical solutions, and the beneficial effects brought by the technical features of these technical solutions, other technical problems that can be solved by the battery pack and the electrical equipment provided by the embodiments of the present application, other technical features included in the technical solutions, and the beneficial effects brought by these technical features will be further described in detail in the specific implementation manners. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 Structural schematic diagram of the battery pack provided by the embodiment of the present application;

[0027] Figure 2 Partial structural schematic of the battery pack provided by the embodiment of the present application Figure 1 ;

[0028] Figure 3 Partial structural schematic of the battery pack provided by the embodiment of the present application Figure 2 ;

[0029] Figure 4 Schematic diagram of the thermoelectric device provided by the embodiment of the present application;

[0030] Figure 5 For Figure 4 Enlarged schematic diagram of area A in

[0031] Description of the reference numerals:

[0032] 100: Battery module; 110: Battery cell; 120: Barrier layer; 130: End plate;

[0033] 200: Thermoelectric device; 210: First substrate; 220: Second substrate; 230: Semiconductor thermocouple; 231: First electrode layer; 232: Second electrode layer; 233: P-type semiconductor; 234: N-type semiconductor;

[0034] 300: Heat dissipation device;

[0035] 400: First conduction layer;

[0036] 500: Second conduction layer;

[0037] 600: Box body;

[0038] 700: Heat dissipation fan. Detailed implementation mode

[0039] As described in the background art, the thermoelectric devices in the related art have the problem of poor heat exchange efficiency. After research by the inventor, it is found that the reason for this problem is that the heat exchange device is directly connected to the battery module and the heat dissipation device, resulting in untimely heat transfer, which in turn affects the heat exchange efficiency of the thermoelectric device.

[0040] In view of the above technical problems, the embodiments of the present application provide a battery pack and an electrical device. By providing a first conduction layer between the thermoelectric device and the battery module, and a second conduction layer between the thermoelectric device and the heat dissipation device, and using the first conduction layer and the second conduction layer for heat conduction, the heat generated by the battery module can be effectively transferred to the heat dissipation device, thereby improving the heat dissipation efficiency, keeping the battery module within a suitable working temperature range, extending the service life of the battery module, and further extending the service life of the battery pack.

[0041] In order to make the above objects, features, and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application.

[0042] Please refer to the attached Figure 1 and the attached Figure 2 , the embodiments of the present application provide a battery pack. The battery pack includes a battery module 100. Among them, the battery module 100 includes a plurality of battery cells 110, and the plurality of battery cells 110 are arranged in sequence along a first direction, and the first direction can be the Figure 2 X direction in

[0043] It should be noted that each battery cell 110 can be a steel shell battery or a soft shell battery. Exemplarily, each battery cell 110 can include a housing and an electrode assembly and electrolyte disposed in the housing. In order to facilitate the electrical connection between the battery cell 110 and an external electrical device, a pole column is also provided on each battery cell 110. It should be understood that the pole column generally includes a positive pole column and a negative pole column. In this embodiment, only the installation position of the pole column is shown, and the positive pole column and the negative pole column are not drawn.

[0044] In this embodiment, the battery module 100 includes multiple battery packs, with a barrier layer 120 disposed between any adjacent battery packs. Barrier layer 120 has extremely low thermal conductivity, effectively isolating heat transfer. By disposing barrier layer 120 between adjacent battery packs, this embodiment prevents heat transfer between the packs, thereby reducing heat accumulation, avoiding localized overheating, and improving the overall thermal management performance of the battery pack.

[0045] Furthermore, placing barrier layer 120 between battery packs can effectively prevent the spread of thermal runaway. If thermal runaway occurs in one battery pack, barrier layer 120 can isolate the heat transfer and prevent the thermal runaway from spreading to other battery packs, thereby improving the safety of the battery pack.

[0046] It should be noted that, in this embodiment, the material of the barrier layer 120 may be aerogel, and each battery pack may include two battery cells 110 , three battery cells 110 , or more battery cells 110 .

[0047] Please continue to refer to the attached Figure 2 The battery pack further includes end plates 130, which are disposed on at least two sides of the battery module 100 in the first direction. In one example, there is one end plate 130, disposed on one side of the battery module 100. In another example, there are two end plates 130, one on each side of the battery module 100 in the first direction.

[0048] Please refer to the attached Figure 3 The battery pack also includes a thermoelectric device 200 and a heat sink 300. The thermoelectric device includes a first bonding surface and a second bonding surface disposed opposite each other. The first bonding surface is connected to the battery module 100 via a first conductive layer 400, while the second bonding surface of the thermoelectric device is connected to the heat sink 300 via a second conductive layer 500.

[0049] With such an arrangement, the first conductive layer 400 and the second conductive layer 500 are used for heat conduction, which can effectively transfer the heat generated by the battery module 100 to the heat dissipation device 300, thereby improving the heat dissipation efficiency, keeping the battery module 100 within a suitable operating temperature range, extending the service life of the battery module 100, and further extending the service life of the battery pack.

[0050] It should be understood that both the first conductive layer 400 and the second conductive layer 500 include a thermal pad or thermally conductive adhesive. In this embodiment, the thermal pad and thermally conductive adhesive have excellent thermal conductivity and can effectively transfer heat generated by the battery module to the thermoelectric device and the heat sink. By using a thermal pad or thermally conductive adhesive as a conductive layer, the heat transfer efficiency can be significantly improved, ensuring that the heat from the battery module 100 is quickly removed by the heat sink 300, thereby maintaining the battery module 100 at a suitable operating temperature.

[0051] In addition, the thermal conductive pad and the thermal conductive adhesive have good flexibility and plasticity, and can fill the tiny gaps between the battery module 100 and the thermoelectric device 200, as well as between the thermoelectric device 200 and the heat dissipation device 300, ensuring close contact and reducing the thermal resistance. In this way, on the one hand, the thermal conduction efficiency can be further improved, and local overheating caused by poor contact can be avoided. On the other hand, it can absorb and relieve the mechanical vibration and impact suffered by the battery pack during use, protect the battery module 100 and other components, and extend the service life of the battery pack.

[0052] In a possible implementation, please refer to Attached Figure 4 and Attached Figure 5 , the thermoelectric device 200 includes a first substrate 210, a second substrate 220, and a semiconductor thermocouple 230 disposed between the first substrate 210 and the second substrate 220. The surface of the first substrate 210 facing away from the second substrate 220 constitutes a first bonding surface, and the surface of the second substrate 220 facing away from the first substrate 210 constitutes a second bonding surface. Among them, both the first substrate 210 and the second substrate 220 can be made of insulating materials. For example, the first substrate 210 and the second substrate 220 are made of rubber materials, or the first substrate 210 and the second substrate 220 are made of ceramic materials or glass.

[0053] The semiconductor thermocouple includes a first state and a second state. When the semiconductor thermocouple is in the first state, it is used to cool the battery module 100. When the semiconductor thermocouple is in the second state, it is used to heat the battery module 100.

[0054] For example, when a forward current is applied to the thermoelectric device 200, the end of the semiconductor thermocouple 230 facing the battery module 100 will absorb heat to generate a cooling effect, thereby cooling the battery module 100. When a reverse current is applied to the thermoelectric device 200, the end of the semiconductor thermocouple 230 facing the battery module 100 will release heat to generate a heating effect, thereby heating the battery module 100.

[0055] With such a setting, by controlling the direction and magnitude of the current, the state of the thermoelectric device 200 can be flexibly adjusted, thereby achieving more efficient temperature management and control.

[0056] It should be noted that how to apply a forward current or a reverse current to the thermoelectric device 200 can be connected to the semiconductor thermocouple through electrode leads. Among them, the setting position and function of the electrode leads are both prior arts, and will not be elaborated in this embodiment.

[0057] In a possible implementation, the semiconductor thermocouple 230 includes a thermoelectric material layer, and a first electrode layer 231 and a second electrode layer 232 respectively disposed on both sides of the thermoelectric material layer.

[0058] Among them, the thermoelectric material layer includes a plurality of P-type semiconductors 233 and a plurality of N-type semiconductors 234, and the plurality of P-type semiconductors 233 and the plurality of N-type semiconductors 234 are alternately and spaced apart.

[0059] The first electrode layer 231 is connected to one side of the thermoelectric material layer, and the second electrode layer 232 is connected to the other side of the thermoelectric material layer; wherein, the first electrode layer 231 and the second electrode layer 232 are used for connecting to an external power source to provide a forward current or a reverse current to the thermoelectric material layer.

[0060] In this embodiment, the first electrode layer 231 and the second electrode layer 232 have a large contact area with the thermoelectric material layer, providing a low-resistance path. The first electrode layer 231 and the second electrode layer 232 can reduce the energy loss during the power transmission process, thereby improving the thermoelectric conversion efficiency of the thermoelectric device 200. In addition, the first electrode layer 231 and the second electrode layer 232 usually have good thermal conductivity, which helps the heat transfer and distribution. This helps to maintain the temperature difference of the thermoelectric material layer, thereby improving the efficiency of the thermoelectric effect of the thermoelectric device 200.

[0061] In a possible implementation, please continue to refer to the appendix Figure 2 , the heat dissipation device 300 includes a plurality of heat dissipation fins, and the plurality of heat dissipation fins are spaced apart on the second conduction layer 500. By increasing the number and surface area of the heat dissipation fins in this embodiment, the heat conduction and heat dissipation capabilities of the heat dissipation device 300 can be significantly improved; and the spaced-apart arrangement of the fins helps to dissipate heat more effectively and reduce the temperature of the heat source.

[0062] In addition, the plurality of heat dissipation fins are spaced apart on the second conduction layer 500, which helps to optimize the air flow path, reduce the air resistance, enhance the effect of natural convection or forced convection, and thus improve the heat dissipation efficiency of the heat dissipation device 300.

[0063] Please continue to refer to the appendix Figure 1 , the battery pack further includes a box body 600, and the battery module 100, the thermoelectric device 200 and the heat dissipation device 300 are stacked in the box body 600; arranged in this way, the space inside the box body 600 can be maximally utilized, the compactness and integration degree of the battery pack can be improved, and it is suitable for application scenarios with limited space.

[0064] A cooling fan 700 is installed on the inner wall of the housing 600. This cooling fan 700 provides forced convection, further enhancing the heat dissipation effect. Furthermore, the cooling fan 700 effectively removes heat from the heat sink 300 and the surrounding battery module 100, preventing the risk of overheating of the battery pack.

[0065] It should be noted that when the battery pack is in a low-temperature environment, by changing the current direction, the hot surface can be directed toward the battery module 100 , and the cooling fan 700 is turned off, thereby ensuring the heating effect of the thermoelectric device 200 .

[0066] In one possible implementation, the box body 600 includes an air inlet and an air outlet that are relatively arranged; illustratively, the box body 600 includes a bottom plate, a top plate, and side plates arranged between the bottom plate and the top plate, and the bottom plate, the top plate, and the side plates form a receiving cavity for accommodating the battery module 100, the thermoelectric device 200, and the heat dissipation device 300.

[0067] The air inlet and the air outlet are arranged on two opposite surfaces of the side panels, so that a linear air flow path can be formed, ensuring that cold air can effectively enter the box 600 and quickly take away the internal heat, thereby improving the heat dissipation efficiency.

[0068] The cooling fan 700 is provided at the air outlet, which can effectively extract hot air, enhance air flow, further improve the heat dissipation effect, and help maintain the optimal operating temperature of the battery module 100, the thermoelectric device 200 and the heat dissipation device 300.

[0069] Filters are installed at the air inlet and / or outlet. These filters effectively prevent dust, particulate matter, and other pollutants in the air from entering the housing 600, thereby protecting the battery module 100, thermoelectric device 200, and heat sink 300 and extending the service life of the battery pack.

[0070] The filter element can be a filter or a small louver. When the filter element is a small louver, the louver is open when the cooling fan 700 is operating and closed when the cooling fan 700 is not operating. This not only provides effective heat dissipation when needed, but also protects internal components when not needed, extending the battery pack life and improving its reliability.

[0071] An embodiment of the present application further provides an electrical device, comprising an electrical device and a battery pack as described in any of the above embodiments, wherein the battery pack is electrically connected to the electrical device to provide electrical energy to the electrical device.

[0072] The electrical device in the embodiments of the present application may be a vehicle. For example, the vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. Correspondingly, the electrical device may be a driving mechanism of the vehicle or a control system of the vehicle.

[0073] In addition, the electrical device may also be other energy storage devices, such as mobile phones, portable devices, laptops, electric toys, electric tools, ships, and spacecrafts, etc. Among them, the spacecraft may include airplanes, rockets, space shuttles, or spaceships.

[0074] Since the electrical device in this embodiment includes the battery described in any of the above embodiments, the structure and beneficial effects of the electrical device including the battery are not elaborated herein again.

[0075] The embodiments or implementation manners in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0076] It should be noted that phrases such as "an embodiment", "embodiments", "exemplary embodiments", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. Moreover, when combining embodiments to describe specific features, structures, or characteristics, it is within the knowledge scope of those skilled in the art to implement such features, structures, or characteristics in combination with other embodiments, whether explicitly or implicitly described.

[0077] Generally speaking, terms should be understood at least in part by their use in the context. For example, at least in part according to the context, the term "one or more" used herein can be used to describe any feature, structure, or characteristic in the sense of a singular, or can be used to describe a combination of features, structures, or characteristics in the sense of a plural. Similarly, at least in part according to the context, terms such as "a" or "the" can also be understood as conveying a singular usage or conveying a plural usage.

[0078] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, or an indirect connection through an intermediate medium, or the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0079] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of this application and the above-mentioned drawings are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of this application described herein, for example, can be implemented in an order other than those illustrated or described herein.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them. Although the technical solutions of this application have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. However, such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that, Comprising: A battery module; A thermoelectric device, the thermoelectric device including a first bonding surface and a second bonding surface disposed opposite to each other, the first bonding surface being connected to the battery module through a first conduction layer; A heat dissipation device, the heat dissipation device being connected to the second bonding surface of the thermoelectric device through a second conduction layer.

2. The battery pack according to claim 1, wherein The thermoelectric device includes a first substrate, a second substrate, and semiconductor thermocouples disposed between the first substrate and the second substrate. The surface of the first substrate facing away from the second substrate constitutes the first bonding surface, and the surface of the second substrate facing away from the first substrate constitutes the second bonding surface; The semiconductor thermocouples include a first state and a second state. When the semiconductor thermocouples are in the first state, they are used to cool the battery module, and when the semiconductor thermocouples are in the second state, they are used to heat the battery module.

3. The battery pack according to claim 2, characterized in that The semiconductor thermocouples include a thermoelectric material layer, and a first electrode layer and a second electrode layer respectively disposed on both sides of the thermoelectric material layer; Wherein, the thermoelectric material layer includes a plurality of P-type semiconductors and a plurality of N-type semiconductors, and the plurality of P-type semiconductors and the plurality of N-type semiconductors are alternately and spaced apart.

4. The battery pack according to any one of claims 1-3, characterized in that, Both the first conduction layer and the second conduction layer include a heat conduction pad or a heat conduction adhesive.

5. The battery pack according to any one of claims 1 to 3, characterized in that, The battery module includes a plurality of battery groups, and a barrier layer is disposed between adjacent battery groups.

6. The battery pack according to any one of claims 1 to 3, characterized in that, The heat dissipation device includes a plurality of heat dissipation fins, and the plurality of heat dissipation fins are spaced apart and disposed on the second conduction layer.

7. The battery pack according to claim 6, characterized in that, The battery pack further includes a box body, and the battery module, the thermoelectric device, and the heat dissipation device are stacked and disposed in the box body; A heat dissipation fan is disposed on the inner wall of the box body.

8. The battery pack according to claim 7, characterized in that, The box body includes an air inlet and an air outlet disposed opposite to each other; the heat dissipation fan is disposed at the air outlet.

9. The battery pack according to claim 8, wherein, Filter elements are disposed at both the air inlet and / or the air outlet.

10. An electrical device, characterized in that, Including an electrical device and the battery pack according to any one of claims 1-9, the battery pack being electrically connected to the electrical device for supplying electrical energy to the electrical device.

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