Battery pack and electric equipment

Abstract

The utility model provides a battery pack and electric equipment, relates to the technical field of batteries, and aims to improve the thermal insulation performance of the battery pack. The battery pack comprises a box body, a battery module, a heat management plate and a connecting piece, the box body comprises a top plate, a bottom plate and a frame located between the top plate and the bottom plate, and the two ends of the frame are connected with the top plate and the bottom plate respectively. The battery module is located in the box body. And the heat management plate is arranged at the bottom of the battery module. The connecting piece is arranged among the bottom plate, the heat management plate and the bottom of the frame in a penetrating mode, a first elastic heat insulation piece is clamped between the heat management plate and the bottom of the frame, and a second elastic heat insulation piece is clamped between the heat management plate and the bottom plate.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Art

[0002] Battery packs are the power supply system for electrical equipment such as electric vehicles and electric trains. Typically, a battery pack consists of a housing and battery modules installed within the housing, which power the electrical equipment.

[0003] However, in a low temperature environment, the operating temperature of the battery module is low, thereby reducing the cycle life of the battery pack and reducing the charge and discharge rate of the battery pack. Utility Model Content

[0004] The present application provides a battery pack and an electrical device for improving the thermal insulation performance of the battery pack, preventing low temperature environments from reducing the cycle life of the battery pack, and preventing low temperature environments from reducing the charge and discharge rates of the battery pack.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] One aspect of the present application provides a battery pack, comprising:

[0007] A box body, comprising a top plate, a bottom plate, and a frame, wherein the frame is located between the top plate and the bottom plate, and two ends of the frame are respectively connected to the top plate and the bottom plate;

[0008] A battery module, the battery module being located in the box;

[0009] a heat management plate, the heat management plate being arranged at the bottom of the battery module;

[0010] A connecting piece is provided between the bottom plate, the heat management plate and the bottom of the frame, a first elastic heat insulating piece is provided between the heat management plate and the bottom of the frame, and a second elastic heat insulating piece is provided between the heat management plate and the bottom plate.

[0011] In a possible implementation, the connecting member is a rivet nut, and the rivet nut is riveted to the base plate, the heat management plate, and the frame.

[0012] In a possible implementation, a flow channel is provided on the heat management plate. A fluid medium is contained in the flow channel. The fluid medium is used to increase or decrease the temperature of the battery module.

[0013] In a possible implementation, the battery pack further includes a heating film, which is attached to the top of the battery module and is used to increase the temperature of the battery module.

[0014] In a possible implementation, the heating power of the heating film increases sequentially from the center of the battery module toward the edge of the battery module.

[0015] In a possible implementation, the battery pack further includes a heat-resistant plate, which is disposed above the battery module.

[0016] In a possible implementation, the outer surface of the box has a thermal insulation coating, and the thermal insulation coating is used to improve the thermal insulation of the box.

[0017] In a possible implementation, the outer periphery of the box is provided with lifting ears, and the lifting ears are used to install the battery pack in an electrical device.

[0018] In a possible implementation, the lifting lug is a hollow structure, and each end of the lifting lug is closed.

[0019] Another aspect of the present application provides an electrical device, which includes the battery pack described in any one of the above items.

[0020] The battery pack and electrical equipment provided in this application have the following beneficial effects:

[0021] The battery pack includes a housing, battery modules, and thermal management tubes. The housing comprises a top plate, a bottom plate, and a frame. The top, bottom, and frame together form a housing cavity within the housing, allowing the battery modules to be placed within the housing and protected by the housing. The thermal management plate, attached to the bottom of the battery module, heats or cools the bottom of the module to prevent the operating temperature from being too high or too low.

[0022] Compared with the related art, the battery pack and electrical equipment provided in the present application are passed through the bottom of the bottom plate, the heat management plate and the frame through a connector to connect the bottom plate, the heat management plate and the frame. By sandwiching a first elastic thermal insulation member between the heat management plate and the bottom of the frame, the first elastic thermal insulation member supports the heat management plate and the frame, thereby reducing heat transfer between the heat management plate and the bottom of the frame in a low-temperature environment. By sandwiching a second elastic thermal insulation member between the heat management plate and the bottom of the bottom plate, the second elastic thermal insulation member supports the heat management plate and the bottom plate, thereby reducing heat transfer between the heat management plate and the bottom plate in a low-temperature environment. This insulates the battery module, improves the thermal insulation performance of the battery pack, prevents the low-temperature environment from reducing the cycle life of the battery pack, and prevents the low-temperature environment from reducing the charge and discharge rate of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 A schematic diagram of the exploded structure of a battery pack provided in an embodiment of the present application;

[0025] Figure 2 A side view of a battery pack provided in an embodiment of the present application;

[0026] Figure 3 for Figure 2 Enlarged view of the cross-sectional structure of the framed part.

[0027] Description of reference numerals:

[0028] 10. Box body;

[0029] 11. Top plate; 12. Bottom plate; 13. Frame; 131. Lifting lug;

[0030] 20. Battery module;

[0031] 30. Thermal management board;

[0032] 31. Flow channel; 311. Inlet; 312. Outlet;

[0033] 40. Connectors;

[0034] 51. First elastic thermal insulation member; 52. Second elastic thermal insulation member; 521. Second foam;

[0035] 522, foam glue;

[0036] 60. Heating film;

[0037] 70. Heat-resistant board. DETAILED DESCRIPTION

[0038] Battery packs in low-temperature environments have technical issues such as low cycle life and low charge and discharge rates. This problem occurs because flow drill screws are usually inserted between the bottom of the base plate, thermal management plate, and the bottom of the frame to connect the base plate, thermal management plate, and the bottom of the frame. When the flow drill screws are tightened, the bottom of the base plate or the frame deforms, reducing the distance between the base plate and the thermal management plate or the distance between the thermal management plate and the bottom of the frame, which speeds up the transfer of heat from the battery module to the box through the thermal management plate, thereby reducing the thermal insulation performance of the battery pack.

[0039] In response to the above technical problems, the present application provides a battery pack and an electrical device, which are connected by a connector inserted between the bottom of the bottom plate, the heat management plate and the bottom of the frame. A first elastic thermal insulation member is sandwiched between the heat management plate and the bottom of the frame, and the first elastic thermal insulation member supports the heat management plate and the frame, thereby reducing heat transfer between the heat management plate and the bottom of the frame in a low-temperature environment. A second elastic thermal insulation member is sandwiched between the heat management plate and the bottom plate, and the second elastic thermal insulation member supports the heat management plate and the bottom plate, thereby reducing heat transfer between the heat management plate and the bottom plate in a low-temperature environment. This avoids deformation of the bottom of the bottom plate or the frame when the connector is tightened, reduces heat transfer between the heat management plate and the box, and improves the thermal insulation performance of the battery pack.

[0040] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0041] like Figure 1 As shown, the embodiment of the present application provides a battery pack, which includes a box 10, a battery module 20, a heat management plate 30, a connector 40, a first elastic heat insulating member 51 and a second elastic heat insulating member 52. Figure 1 The box body 10 includes a top plate 11, a bottom plate 12 and a frame 13.

[0042] The top plate 11 may be the upper cover of the box body 10, located above the frame 13, and may be buckled onto the frame 13. The bottom plate 12 may be the bottom cover of the box body 10, located below the frame 13, for example, the frame 13 is pressed onto the bottom plate 12.

[0043] like Figure 1 As shown, the frame 13 may include a circular rectangular frame, the top of the frame 13 is connected to the top plate 11, and the bottom of the frame 13 is connected to the bottom plate. For example, the top plate 11 and the top of the frame 13 are bonded or screwed. The bottom of the frame 13 is connected to the bottom plate 12. Figure 3 The bottom plate 12 and the frame 13 are provided with a connecting piece 40, which can be a threaded connecting piece, such as a screw. The connecting piece 40 can also be a riveted connecting piece, such as a rivet nut.

[0044] The battery module 20 is the portion of the battery pack that provides power. The battery module 20 may include multiple cells, which may be connected in series, in parallel, or in a combination of these. The number of battery modules 20 may be one or more.

[0045] The thermal management board 30 is a temperature control system in the battery pack. Figure 1 and Figure 3 As shown, the thermal management plate 30 is disposed at the bottom of the battery module 20. For example, the thermal management plate 30 is installed in the housing 10, and the battery module 20 is mounted on the thermal management plate 30. The thermal management plate 30 cools or heats the battery module 20 by exchanging heat with the battery module 20. When the temperature of the battery module 20 is greater than a first set temperature, which may be the upper limit of the operating temperature of the battery module 20, the temperature of the thermal management plate 30 is lowered, thereby cooling the battery module 20. When the temperature of the battery module 20 is less than a second set temperature, which may be the lower limit of the operating temperature of the battery module 20, the temperature of the thermal management plate 30 is increased, thereby heating the battery module 20.

[0046] The connecting member 40 may be a threaded connecting member, such as a screw. The connecting member 40 may also be a riveted connecting member, such as a rivet nut. Figure 3 As shown, the connector 40 is disposed between the bottom plate 12, the heat management plate 30, and the bottom of the frame 13. A first elastic thermal insulation member 51 is sandwiched between the bottom of the frame 13 and the heat management plate 30, and a second elastic thermal insulation member 52 is sandwiched between the heat management plate 30 and the bottom plate 12. The connector 40, the first elastic thermal insulation member 51, and the second elastic thermal insulation member 52 cooperate to mount the bottom plate 12 and the heat management plate 30 on the bottom of the frame 13. It is understood that there may be multiple connectors 40, with multiple connectors 40 spaced apart along the bottom of the frame 13.

[0047] like Figure 3 As shown, the first elastic thermal insulation member 51 can be a first foam, which is filled between the bottom of the frame 13 and the thermal management plate 30. This prevents deformation of the frame 13 caused by tightening the connector 40, thereby preventing a reduction in the heat transfer path between the bottom of the frame 13 and the thermal management plate 30, thereby improving the thermal insulation performance of the battery pack. The first foam has thermal insulation properties, further improving the thermal insulation performance of the battery pack.

[0048] Continue to refer Figure 3 The second elastic thermal insulation member 52 may include a second foam 521 and a foam glue 522. The bottom plate 12 includes an outer edge portion and an inner concave portion. The outer edge portion is used to connect to the thermal management plate 30, and the inner concave portion is recessed away from the thermal management plate 30. The second foam 521 is filled between the outer edge portion and the thermal management plate 30 to prevent deformation of the bottom plate 12 caused by tightening the connector 40, thereby preventing the heat transfer path between the bottom plate 12 and the thermal management plate 30 from being reduced, thereby improving the thermal insulation performance of the battery pack. The second foam 521 has thermal insulation properties, further improving the thermal insulation performance of the battery pack.

[0049] The foam glue 522 is filled between the concave portion and the heat management plate 30 to avoid heat exchange between the heat management plate 30 and the bottom plate 12 caused by air convection between the concave portion and the heat management plate, thereby further improving the thermal insulation performance of the battery pack.

[0050] It should be noted that a third foam may be filled between the battery module 20 and the top plate 11. By filling the third foam between the battery module 20 and the top plate 11, heat exchange caused by air flow between the battery module 20 and the top plate 11 can be avoided, thereby further improving the thermal insulation performance of the battery pack.

[0051] The battery pack provided in the present application reduces heat transfer between the heat management plate 30 and the bottom of the frame 13 by sandwiching a first elastic thermal insulation member 51 between the heat management plate 30 and the bottom of the frame 13. The first elastic thermal insulation member 51 supports the heat management plate 30 and the frame 13, thereby reducing heat transfer between the heat management plate 30 and the bottom of the frame 13 in low-temperature environments. Furthermore, a second elastic thermal insulation member 52 is sandwiched between the heat management plate 30 and the bottom plate 12, thereby supporting the heat management plate 30 and the bottom plate 12, thereby reducing heat transfer between the heat management plate 30 and the bottom plate 12 in low-temperature environments. This prevents deformation of the bottom of the bottom plate 12 or the frame 13 caused by tightening the connector, reduces heat transfer between the heat management plate 30 and the housing 10, and improves the thermal insulation performance of the battery pack.

[0052] In some embodiments, the connector 40 is a rivet nut, which is a connector for connecting plates or tubes. The rivet nut includes a rod and a head, and the rod can be pulled by a rivet gun and deformed in a direction away from the center line of the rod to form a protrusion, and the connected parts can be connected together through the protrusion and the head. For example, the rivet nut is inserted between the bottom plate 12, the thermal management plate 30 and the bottom of the frame 13, wherein the head is located under the bottom plate 12, and the protrusion of the rod is pressed on the bottom of the frame 13 to rivet the bottom plate 12, the thermal management plate 30 and the frame 13. Compared with the heat generated by the flow drill screw connection, the rivet nut riveting is cold riveting, which avoids high temperature damage to the first elastic thermal insulation member 51 or the second elastic thermal insulation member 52.

[0053] In some embodiments, as Figure 3 As shown, the heat management plate 30 is provided with a flow channel 31, which may include a plurality of sub-flow channels, each of which may be arranged side by side along the length or width direction of the heat management plate 30, and each of which is connected in sequence. The flow channel 31 contains a fluid medium, which may be water, ethylene glycol, oil, air, etc. Figure 2 As shown, the flow channel 31 may include an inlet 311 and an outlet 312 , and the fluid medium may flow into the inlet 311 and flow out of the outlet 312 .

[0054] When the battery module 20 needs to cool down or dissipate heat, a low-temperature fluid medium is injected into the flow channel. The low-temperature fluid medium exchanges heat with the battery module 20 to cool the battery module 20. When the battery module 20 needs to be kept warm or heated, a high-temperature fluid medium is injected into the flow channel. The high-temperature fluid medium exchanges heat with the battery module 20 to keep the battery module 20 warm or heat it up. This embodiment improves the thermal insulation performance of the battery pack through heat exchange between the fluid medium and the battery module 20.

[0055] In some embodiments, as Figure 1 As shown, the battery pack also includes a heating film 60, which is a thin film that generates heat through electric current or other means. The heating film 60 can be a graphene heating film, a PI heating film, or a carbon crystal heating film. The heating film 60 covers the top of the battery module 20. In low-temperature or extremely cold environments, the heating film 60 can transfer heat to the battery module 20, thereby further improving the thermal insulation performance of the battery module 20.

[0056] Based on the above embodiment, the heating power of the heating film 60 increases sequentially from the center of the battery module 20 toward the edge of the battery module 20. Because heat transfer through the battery module 20 causes greater thermal damage to the outer portion of the battery module 20 than to the inner portion, the heating power of the heating film 60 arranged outside the battery module 20 is higher than that of the heating film arranged inside the battery module 20. This ensures a uniform temperature distribution across the battery module 20, preventing significant temperature differences within the battery module 20.

[0057] In an extremely low temperature environment, the heating film 60 and the heat management plate 30 can be activated simultaneously to increase the temperature rise rate of the battery module 20 .

[0058] In some embodiments, as Figure 1 As shown, the battery pack also includes a heat-resistant plate 70, which can be a mica plate. The mica plate is a hard or soft plate structure formed by bonding, heating, and pressing mica paper and high-performance silicone resin (or silicone water). The heat-resistant plate 70 is arranged above the battery module 20, for example, the heat-resistant plate 70 is connected to the top plate 11 or the frame 13. When the battery cell explosion-proof valve in the battery module sprays high-temperature gas, it can be blocked by the heat-resistant plate 70 to prevent the high-temperature gas from being directly sprayed onto the top plate 11, thereby protecting the box 10.

[0059] In some embodiments, the outer surface of the housing 10 has a thermal insulation coating. For example, the outer surfaces of the top plate 11, bottom plate 12, and frame 13 are all sprayed or adhered with a thermal insulation coating, which may be polyurethane, for example. The thermal insulation coating improves the thermal insulation of the housing 10, thereby reducing heat exchange between the inside and outside of the housing 10 and further improving the thermal insulation performance of the battery pack.

[0060] In some embodiments, as Figure 1 As shown, the outer periphery of the box body 10 is provided with a lifting lug 131, which is the installation part or the connection part of the box body 10. Figure 1 The lifting lugs 131 may include a first lifting lug, a second lifting lug, a third lifting lug, and a fourth lifting lug. The first lifting lug, the second lifting lug, the third lifting lug, and the fourth lifting lug are respectively mounted on the four connecting rods of the frame 13. The lifting lugs 131 may be provided with through holes or threaded holes to facilitate installation of the battery pack in the electrical device.

[0061] Based on the above embodiment, the lugs 131 are hollow structures. For example, the first, second, third, and fourth lugs all have cavities within them, thereby reducing the weight of the battery pack. Furthermore, the ends of the hollow lugs 131 are sealed. For example, the lugs 131 include a hollow cavity and a sealing piece. The sealing piece can be welded to the open end of the hollow cavity to seal the hollow cavity. This prevents air from circulating within the cavity, which could cause the box 10 to cool down, further improving the thermal insulation performance of the battery pack.

[0062] The present application also provides an electrical device, which may include, but is not limited to, mobile devices, electric vehicles, electric trains, ships, satellites, energy storage systems, etc. Specifically, the mobile devices may be, for example, mobile phones and laptops; the electric vehicles may be, for example, pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc., but the embodiments of the present application are not limited thereto.

[0063] The electrical device includes a battery pack. The specific structure and related effects of the battery pack can be referred to the relevant description of the above embodiments. Since the electrical device provided in this application adopts all the technical solutions of any of the above embodiments, it has at least all the beneficial effects brought by any of the above embodiments, which will not be described in detail here.

[0064] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0065] It should be noted that phrases such as "in a specific implementation," "in some embodiments," "in this embodiment," and "exemplarily" mentioned in the specification indicate that the described embodiment may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0066] Generally speaking, terms should be understood, at least in part, based on the context in which they are used. For example, as used herein, the term "one or more" can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense, depending at least in part on the context. Similarly, terms such as "a," "an," or "the" can also be understood to convey either singular or plural usage, depending at least in part on the context.

[0067] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include at least one of these features.

[0068] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0069] It should be readily understood that “on,” “above,” and “over” in this disclosure should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0070] Additionally, spatially relative terms, such as "below," "beneath," "beneath," "above," and the like, may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be in other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: include: A box body (10), the box body (10) comprising a top plate (11), a bottom plate (12) and a frame (13), the frame (13) being located between the top plate (11) and the bottom plate (12), and two ends of the frame (13) being connected to the top plate (11) and the bottom plate (12) respectively; A battery module (20), the battery module (20) being located in the box (10); a heat management plate (30), the heat management plate (30) being arranged at the bottom of the battery module (20); A connecting member (40) is provided between the bottom plate (12), the heat management plate (30) and the bottom of the frame (13); a first elastic heat insulating member (51) is provided between the heat management plate (30) and the bottom of the frame (13); and a second elastic heat insulating member (52) is provided between the heat management plate (30) and the bottom plate (12).

2. The battery pack according to claim 1, wherein: The connecting member (40) is a rivet nut, and the rivet nut rivets the base plate (12), the heat management plate (30), and the frame (13).

3. The battery pack according to claim 1 or 2, characterized in that: The heat management plate (30) is provided with a flow channel (31), wherein the flow channel (31) contains a fluid medium, and the fluid medium is used to increase or decrease the temperature of the battery module (20).

4. The battery pack according to claim 3, wherein: It also includes a heating film (60), which is attached to the top of the battery module (20) and is used to increase the temperature of the battery module (20).

5. The battery pack according to claim 4, characterized in that: The heating power of the heating film (60) increases sequentially from the center of the battery module (20) toward the edge of the battery module (20).

6. The battery pack according to claim 1 or 2, characterized in that: It also includes a heat-resistant plate (70), which is arranged above the battery module (20).

7. The battery pack according to claim 1 or 2, characterized in that: The outer surface of the box body (10) is provided with a heat-insulating coating, and the heat-insulating coating is used to improve the heat insulation performance of the box body (10).

8. The battery pack according to claim 1 or 2, characterized in that: The outer periphery of the box body (10) is provided with a lifting lug (131), and the lifting lug (131) is used to install the battery pack in an electrical device.

9. The battery pack according to claim 8, characterized in that: The lifting lug (131) is a hollow structure, and each end of the lifting lug (131) is closed.

10. An electrical device, characterized in that: Comprising a battery pack as described in any one of claims 1-9.

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