Battery pack and electric equipment

Abstract

The utility model discloses a battery pack and electric equipment, and belongs to the technical field of batteries. The battery pack comprises a battery cell and a heat exchange assembly; the heat exchange assembly comprises a heat exchange plate, a heating piece and an elastic piece; the heat exchange plate is provided with a first surface and a second surface which are deviated from each other, the battery cell is arranged on the first surface and is in heat conduction connection with the heat exchange plate, and a cooling cavity is formed in the heat exchange plate and is used for circulating cooling liquid to cool the battery cell; the heating piece is embedded in the heat exchange plate, is separated from the cooling cavity and is used for heating the battery cell; the elastic piece is arranged on the second face and connected with the heat exchange plate, and the elastic piece corresponds to the heating piece in position. According to the battery pack, the heating piece is embedded in the heat exchange plate, so that the occupied space of the heating piece is reduced, and the occupied space of the battery pack is reduced; and elastic pieces are arranged at the positions, corresponding to the heating pieces, of the heat exchange plates, so that a buffering effect is achieved when the battery pack is subjected to external force, the heating pieces are protected, and the safety of the battery pack is improved.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack and electrical equipment. Background Technology

[0002] The temperature of a power battery during operation is crucial to its performance; excessively high or low temperatures can affect the battery's lifespan and safety.

[0003] In related technologies, a power battery pack includes battery cells, a liquid cooling plate, and a heater. The liquid cooling plate is used to dissipate heat from the battery cells, and the heater is used to heat the battery cells to keep their operating temperature within a normal range. However, in these technologies, the heater occupies a large space, and because it is an electronic component, it is easily damaged by external forces such as impacts or collisions during battery pack operation, affecting the safety performance of the power battery pack. Utility Model Content

[0004] This application aims to provide a battery pack and electrical equipment that can solve the problems in the related technology where the heater of the power battery pack occupies a large space and is easily damaged by impact or collision.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application propose a battery pack, comprising: a battery cell and a heat exchange assembly; the heat exchange assembly includes a heat exchange plate, a heating element, and an elastic element; the heat exchange plate has intersecting first and second directions, and has a first and second surface disposed opposite to each other; the battery cell is disposed on the first surface and is thermally connected to the heat exchange plate; a cooling cavity is provided in the heat exchange plate, the cooling cavity being used to circulate coolant to cool the battery cell; the heating element is embedded in the heat exchange plate, and the heating element is spaced apart from the cooling cavity, and is used to heat the battery cell; the elastic element is disposed on the second surface and connected to the heat exchange plate, and the position of the elastic element corresponds to that of the heating element.

[0007] Optionally, the heat exchange plate includes a first plate and a second plate stacked together; the second plate has a first groove and a second groove on the side facing the first plate, the first groove and the second groove are spaced apart from each other, the first plate and the first groove enclose the cooling cavity, the first plate and the second groove enclose the heating cavity, and the heating element is disposed in the heating cavity; the first surface is the side of the first plate away from the second plate, and the second surface is the side of the second plate away from the first plate.

[0008] Optionally, the first groove includes a plurality of first sub-grooves spaced apart along the first direction and a connecting groove disposed between two adjacent first sub-grooves. The first sub-grooves extend along the second direction, and the connecting groove connects two adjacent first sub-grooves. Optionally, a plurality of second grooves are provided, which are spaced apart along the first direction. Each second groove is disposed between two adjacent first sub-grooves, and at most one second groove is disposed between every two adjacent first sub-grooves.

[0009] Optionally, the elastic member includes a main body and a connecting portion connected to at least one end of the main body along a first direction; the main body is disposed on the second surface, and the orthographic projection of the main body on the second surface at least partially overlaps with the orthographic projection of the heating element on the second surface, and the connecting portion is connected to the heat exchange plate.

[0010] Optionally, the width of the main body portion along the first direction is greater than or equal to the width of the heating element along the first direction.

[0011] Optionally, multiple elastic elements are provided, and the multiple elastic elements are arranged at intervals along the length extension direction of the heating element, with each elastic element connected to the heat exchange plate. Optionally, the heat exchange assembly further includes a thermally conductive adhesive layer disposed between the heating element and the heat exchange plate, the thermally conductive adhesive layer serving to connect the heating element and the heat exchange plate. Optionally, the heating element is a PTC heater.

[0012] Secondly, embodiments of this application provide an electrical device including the battery pack described in any of the above claims.

[0013] In this embodiment, by embedding the heating element within the heat exchange plate, the space occupied by the heating element is reduced, thereby reducing the space occupied by the battery pack. Furthermore, since the heating element is located within the heat exchange plate, it can protect the internal heating element from external impacts, thus reducing the impact on the heating element. Additionally, by providing elastic elements at positions corresponding to the heating element on the heat exchange plate, a buffering effect is provided when the battery pack is subjected to impacts or collisions, reducing the impact of external forces on the heating element and protecting it, thereby improving the safety of the battery pack.

[0014] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0016] Figure 1 This is a schematic diagram of the structure of a heat exchange component according to an embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the structure of the second plate according to an embodiment of this application;

[0018] Figure 3 This is a schematic diagram of the structure of the first plate according to an embodiment of this application;

[0019] Figure 4 This is a side view of a heat exchange assembly according to an embodiment of this application;

[0020] Figure 5 yes Figure 4 An enlarged view of part A, shown in the center circle;

[0021] Figure 6 This is an exploded view of the heat exchange component in the embodiment of the fundamental application;

[0022] Figure 7 This is a schematic diagram of the structure of the elastic element in the embodiment of the fundamental application.

[0023] Figure label:

[0024] 10: Heat exchange plate; 110: Cooling chamber; 120: Heating chamber; 101: Liquid inlet; 102: Liquid outlet; 13: First plate; 131: First surface; 14: Second plate; 141: Second surface; 142: First groove; 1421: First sub-groove; 1422: Connecting groove; 143: Second groove; 20: Heating element; 30: Elastic element; 31: Main body; 32: Connecting part; 40: Adhesive layer; X: First direction; Y: Second direction. Detailed Implementation

[0025] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0026] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0027] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] The battery pack and electrical equipment provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0030] like Figure 1 As shown in the figure, this application embodiment proposes a battery pack, including a battery cell and a heat exchange assembly; the heat exchange assembly includes a heat exchange plate 10, a heating element 20 and an elastic element 30; the heat exchange plate 10 has a first surface 131 and a second surface 141 disposed opposite to each other, the battery cell is disposed on the first surface 131 and is thermally connected to the heat exchange plate 10, the heat exchange plate 10 is provided with a cooling cavity 110, the cooling cavity 110 is used to circulate coolant to cool the battery cell; the heating element 20 is embedded in the heat exchange plate 10 and is spaced apart from the cooling cavity 110, and is used to heat the battery cell; the elastic element 30 is disposed on the second surface 141 and is connected to the heat exchange plate 10, and the position of the elastic element 30 corresponds to that of the heating element 20.

[0031] In this embodiment, by embedding the heating element 20 within the heat exchange plate 10, the space occupied by the heating element 20 is reduced, thereby reducing the space occupied by the battery pack. Furthermore, when the battery pack is subjected to external forces, the heating element 20 can also be protected. Simultaneously, an elastic element 30 is provided on the heat exchange plate 10 at a position corresponding to the heating element 20, so as to buffer the impact or collision of the battery pack, reduce the impact of external forces on the heating element 20, and protect the heating element 20, thereby improving the safety of the battery pack.

[0032] It should be noted that thermally conductive adhesive can be filled in the assembly gap between the elastic element 30 and the heat exchange plate 10 to reduce the heat exchange thermal resistance, thereby improving the heat transfer efficiency and heat utilization rate of the heating element 20.

[0033] Understandably, temperature significantly impacts the performance of battery packs during operation. For instance, high-rate discharge generates substantial heat; if this heat is trapped within the pack and cannot dissipate quickly enough, the battery pack is at risk of thermal runaway. Conversely, low ambient temperatures not only reduce the rate of internal chemical reactions, decreasing usable capacity, but also lower charge / discharge efficiency, affecting stable operation. Therefore, maintaining the battery pack within a suitable temperature range is crucial for ensuring its normal and stable operation.

[0034] Therefore, the battery pack proposed in this application embodiment is equipped with a heat exchange component. The heat exchange plate 10 in the heat exchange component is provided with a cooling chamber 110. When the temperature in the battery pack is high, the coolant flowing into the cooling chamber 110 is used to cool the battery pack. In addition, a heating element 20 is also embedded in the heat exchange plate 10. When the temperature in the battery pack is low, the heating element 20 can heat the battery pack to increase the operating temperature of the battery pack.

[0035] like Figure 2 and Figure 6 As shown, in some embodiments, the heat exchange plate 10 includes a first plate 13 and a second plate 14 stacked together; the second plate 14 has a first groove 142 and a second groove 143 on the side facing the first plate 13, the first groove 142 and the second groove 143 are spaced apart from each other, the first plate 13 and the first groove 142 enclose to form a cooling cavity 110, the first plate 13 and the second groove 143 enclose to form a heating cavity 120, and the heating element 20 is disposed in the heating cavity 120; the first surface 131 is the side of the first plate 13 away from the second plate 14, and the second surface 141 is the side of the second plate 14 away from the first plate 13.

[0036] In this embodiment, by providing a first groove 142 and a second groove 143 spaced apart on the second plate 14, and by covering the second plate 13 on the second plate 14, a cooling cavity 110 is formed by the first plate 13 and the first groove 142, and a heating cavity 120 is formed by the first plate 13 and the second groove 143. This creates independent cooling cavities 110 and heating cavities 120, avoiding interference between the cooling and heating functions of the heat exchange plate 10, and improving the stability and reliability of the heat exchange assembly. Simultaneously, the heating element 20 is placed inside the heating cavity 120, allowing the heat generated by the heating element 20 to be directly transferred to the battery cell through the first plate 13 to heat the battery cell. The coolant in the cooling cavity 110 directly cools the battery cell through the first plate 13. This structural layout is not only simple and compact but also effectively improves heat exchange efficiency.

[0037] In addition, by placing the heating element 20 inside the heating cavity 120, the first plate 13 and the second plate 14 can also protect the heating element 20, thereby reducing the damage to the heating element 20 caused by external forces.

[0038] like Figure 2 As shown, in some embodiments, the heat exchange plate 10 has intersecting first direction X and second direction Y. The first groove 142 includes a plurality of first sub-grooves 1421 arranged at intervals along the first direction X and a connecting groove 1422 disposed between two adjacent first sub-grooves 1421. The first sub-grooves 1421 extend along the second direction Y, and the connecting groove 1422 connects two adjacent first sub-grooves 1421.

[0039] In this embodiment, multiple first sub-grooves 1421 are arranged at intervals along a first direction X, each first sub-grooves 1421 extending along a second direction Y, and a connecting groove 1422 is provided between adjacent first sub-grooves 1421 to connect the two adjacent first sub-grooves 1421, forming a meandering first groove 142. This increases the flow distance of the coolant in the cooling chamber 110, thereby improving the heat exchange efficiency of the heat exchange plate 10. Simultaneously, it also improves the heat exchange uniformity at different locations on the heat exchange plate 10, effectively reducing local stress concentration or deformation caused by temperature changes, thereby enhancing the stability and service life of the heat exchange plate 10.

[0040] The first groove 142 has an S-shaped or U-shaped structure.

[0041] like Figure 2As shown, in some embodiments, there are multiple second grooves 143, which are arranged at intervals along the first direction X. Each second groove 143 is located between two adjacent first sub-grooves 1421, and there is at most one second groove 143 between each two adjacent first sub-grooves 1421.

[0042] In this embodiment of the application, by setting a plurality of second grooves 143, the plurality of second grooves 143 are arranged at intervals along the first direction X, and each second groove 143 is disposed between two adjacent first sub-grooves 1421, so that the second grooves 143 and the first sub-grooves 1421 form a nested structure. In this way, not only can the heat generated by the heat exchange component be more dispersed, but the structural layout of the heat exchange component can also be more compact.

[0043] Specifically, the second groove 143 can be omitted between any two adjacent first sub-grooves 1421, or only one second groove 143 can be provided between any two adjacent first sub-grooves 1421. When only one second groove 143 is provided between any two adjacent first sub-grooves 1421, the phenomenon of excessive heat concentration in local areas of the heat exchange plate generated by the heating element 20 can be effectively reduced, improving the uniformity of heat distribution and thus improving the stability of the battery pack during operation.

[0044] like Figure 7 As shown, in some embodiments, the elastic member 30 includes a main body 31 and a connecting portion 32 connected to at least one end of the main body 31 along the first direction X; the main body 31 is disposed on the second surface 141, and the orthographic projection of the main body 31 on the second surface 141 at least partially overlaps with the orthographic projection of the heating member 20 on the second surface 141, and the connecting portion 32 is connected to the heat exchange plate 10.

[0045] In this embodiment, by providing a main body 31, the orthographic projection of the main body 31 on the second surface 141 at least partially overlaps with the orthographic projection of the heating element 20 on the second surface. At the same time, a connecting part 32 is provided to connect with the heat exchange plate 10. This structural arrangement not only protects the heating element 20 by utilizing the elastic buffering effect of the main body 31, but also improves the stability of the connection between the elastic element 30 and the heat exchange plate 10 by utilizing the connecting part 32.

[0046] Specifically, the main body 31 has a receiving groove on the side facing the heat exchange plate 10, and the heating element 20 is placed in the receiving groove. The connecting part 32 is provided with mounting holes, and screws and other connecting parts are passed through the mounting holes to connect the elastic element 30 and the heat exchange plate 10. This connection method can facilitate the disassembly, maintenance and replacement of the elastic element 30.

[0047] It should be noted that the specific connection method between the elastic element 30 and the heat exchange plate 10 can be flexibly selected according to actual needs, and this embodiment does not impose any restrictions on it.

[0048] In some embodiments, the width of the main body 31 along the first direction X is greater than or equal to the width of the heating element 20 along the first direction X, so that the main body 31 can completely cover the heating element 20, thereby improving the protective effect of the elastic element 30 on the heating element 20 and further preventing the heating element 20 from being damaged under the action of external force.

[0049] It should be noted that the elastic element 30 can be an elastic washer or a spring clip, etc. The specific type of elastic element 30 can be flexibly selected according to actual process requirements, and this embodiment does not limit it.

[0050] like Figure 1 and Figure 6 As shown, in some embodiments, multiple elastic elements 30 are provided, and the multiple elastic elements 30 are arranged at intervals along the length extension direction of the heating element 20, and each elastic element 30 is connected to the heat exchange plate 10.

[0051] In this embodiment, by arranging multiple elastic elements 30 at intervals along the extending direction of the heating element 20, and each elastic element 30 being connected to the heat exchange plate 10, the combined action of the multiple elastic elements 30 can buffer the external force on the heating element 20 when the battery pack is subjected to an impact or collision, thereby further reducing the damage to the heating element 20 and protecting it, thus improving the service life of the battery pack. Figure 5 As shown, in some embodiments, the heat exchange assembly further includes a thermally conductive adhesive layer 40, which is disposed between the heating element 20 and the heat exchange plate 10, and is used to connect the heating element 20 and the heat exchange plate 10.

[0052] In this embodiment, by providing a thermally conductive adhesive layer 40 between the heating element 20 and the heat exchange plate 10, the connection stability between the heating element 20 and the heat exchange plate 10 can be further improved. When the battery pack is subjected to vibration or external impact, the shaking or displacement of the heating element 20 in the heating cavity 120 can be effectively reduced, thereby further protecting the heating element 20 and improving its service life and operational stability. In addition, the thermal conductivity of the thermally conductive adhesive layer 40 can also be used to achieve thermal conduction between the heating element 20 and the heat exchange plate 10, thereby improving the heat transfer efficiency of the heat exchange assembly.

[0053] Specifically, the thermally conductive adhesive layer 40 can be provided on all outer peripheral surfaces of the heating element 20, or it can be provided only on a portion of the outer peripheral surfaces of the heating element 20. In other words, it is sufficient that the thermally conductive adhesive layer 40 is provided on the outer surface of the heating element 20 facing the first plate 13, and / or on the outer surface of the heating element 20 away from the first plate 13. By providing the thermally conductive adhesive layer 40 only on a portion of the outer peripheral surfaces of the heating element 20 while ensuring the stability of the connection between the heating element 20 and the heat exchange plate 10, the material cost of the thermally conductive adhesive layer 40 can be saved.

[0054] It is understood that the thermally conductive adhesive layer 40 can be made of thermally conductive adhesive, thermally conductive tape or thermally conductive gel, etc. The specific material of the thermally conductive adhesive layer 40 can be flexibly selected according to actual needs, and this embodiment does not limit it.

[0055] like Figure 3 and Figure 4 As shown, the heat exchange plate 10 is provided with an inlet 101 and an outlet 102. One end of the cooling chamber 110 is connected to the inlet 101, and the other end of the cooling chamber 110 is connected to the outlet 102, so that the coolant can flow in the cooling chamber 110.

[0056] In this embodiment, an inlet 101 and an outlet 102 are provided on the heat exchange plate 10, and one end of the cooling chamber 110 is connected to the inlet 101, while the other end is connected to the outlet 102. Furthermore, by connecting the inlet 101 and outlet 102 to the coolant supply system, coolant is introduced into the cooling chamber 110 through the inlet 101 and discharged through the outlet 102. This allows the coolant to flow through the cooling chamber 110, carrying away the heat generated by the battery cell and achieving a cooling effect.

[0057] In some embodiments, the heating element 20 is a PTC heater.

[0058] In this embodiment, the heating element 20 is a PTC heater, which consists of a PTC ceramic heating element and an aluminum tube. It has the advantages of low thermal resistance and high heat exchange efficiency, thus improving the heating efficiency of the heating element 20. It is understood that the specific power type of the PTC heater can be selected according to actual conditions, and this embodiment does not impose any limitations on it.

[0059] Optionally, embodiments of this application also provide an electrical device, including the battery pack described in the above embodiments.

[0060] In this embodiment, by embedding the heating element 20 within the heat exchange plate 10, the area occupied by the heating element 20 is reduced, thereby reducing the space occupied by the battery pack. Furthermore, by providing an elastic element 30 at a position corresponding to the heating element 20 on the heat exchange plate 10, it can buffer the battery pack when subjected to external forces such as impacts or collisions, reducing the impact of external forces on the heating element 20 and protecting the heating element 20, thereby improving the safety of the battery pack.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0062] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, include: Battery cell and heat exchange assembly; the heat exchange assembly includes heat exchange plate (10), heating element (20) and elastic element (30); The heat exchange plate (10) has intersecting first direction (X) and second direction (Y); the heat exchange plate (10) has a first surface (131) and a second surface (141) disposed opposite to each other; the battery cell is disposed on the first surface (131) and is thermally connected to the heat exchange plate (10); the heat exchange plate (10) is provided with a cooling cavity (110) for circulating coolant to cool the battery cell; the heating element (20) is embedded in the heat exchange plate (10) and is separated from the cooling cavity (110) for heating the battery cell; The elastic element (30) is disposed on the second surface (141) and connected to the heat exchange plate (10), and the position of the elastic element (30) corresponds to that of the heating element (20).

2. The battery pack according to claim 1, characterized in that, The heat exchange plate (10) includes a first plate body (13) and a second plate body (14) stacked together; The second plate (14) has a first groove (142) and a second groove (143) on the side facing the first plate (13). The first groove (142) and the second groove (143) are separated from each other. The first plate (13) and the first groove (142) enclose the cooling cavity (110). The first plate (13) and the second groove (143) enclose the heating cavity (120). The heating element (20) is disposed in the heating cavity (120). The first surface (131) is the side of the first plate (13) that is away from the second plate (14), and the second surface (141) is the side of the second plate (14) that is away from the first plate (13).

3. The battery pack according to claim 2, characterized in that, The first groove (142) includes a plurality of first sub-grooves (1421) arranged at intervals along the first direction (X) and a connecting groove (1422) disposed between two adjacent first sub-grooves (1421). The first sub-grooves (1421) extend along the second direction (Y), and the connecting groove (1422) connects two adjacent first sub-grooves (1421).

4. The battery pack according to claim 3, characterized in that, The second groove (143) is provided in multiple ways, and the multiple second grooves (143) are arranged at intervals along the first direction (X). Each second groove (143) is provided between two adjacent first sub-grooves (1421), and there is at most one second groove (143) between each two adjacent first sub-grooves (1421).

5. The battery pack according to any one of claims 1-4, characterized in that, The elastic element (30) includes a main body (31) and a connecting part (32) connected to at least one end of the main body (31) along a first direction (X); the main body (31) is disposed on the second surface (141), and the orthographic projection of the main body (31) on the second surface (141) at least partially coincides with the orthographic projection of the heating element (20) on the second surface (141), and the connecting part (32) is connected to the heat exchange plate (10).

6. The battery pack according to claim 5, characterized in that, The width of the main body (31) along the first direction (X) is greater than or equal to the width of the heating element (20) along the first direction (X).

7. The battery pack according to any one of claims 1-4, characterized in that, The elastic element (30) is provided in multiple ways, and the multiple elastic elements (30) are arranged at intervals along the length extension direction of the heating element (20), and each elastic element (30) is connected to the heat exchange plate (10).

8. The battery pack according to any one of claims 1-4, characterized in that, The heat exchange assembly further includes a thermally conductive adhesive layer (40), which is disposed between the heating element (20) and the heat exchange plate (10) and is used to connect the heating element (20) and the heat exchange plate (10).

9. The battery pack according to claim 1, characterized in that, The heating element (20) is a PTC heater.

10. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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