Battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a battery pack which comprises a battery box body, cylindrical batteries and a heat exchange system, the battery box body comprises a bottom plate positioned at the bottom; the cylindrical battery is arranged in the battery box body, the cylindrical battery is provided with two end surfaces which are arranged at intervals along the axial direction and are respectively vertical to the axial direction, and the end surfaces are vertical to the bottom plate; the heat exchange system comprises a heat exchange plate and a circulation pipeline; the large surface of the heat exchange plate is vertically arranged relative to the bottom plate, the heat exchange plate comprises a body part and a connecting part, the body part is in contact with the cylindrical battery for heat exchange, the body part is internally provided with a heat exchange runner, the connecting part is connected to the body part and is provided with a connecting surface, the connecting surface is provided with a connecting port, the connecting port is communicated with the heat exchange runner, and the opening direction of the connecting port is a first direction; an included angle of 10-90 degrees is formed between the first direction and the connecting surface; the circulation pipeline is connected to the connector.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery pack. Background Art

[0002] In the existing design scheme of battery pack, some battery packs adopt the design of lying cylindrical batteries, that is, the axial direction of the cylindrical battery is parallel to the bottom plate of the battery box, and the heat exchange plate is arranged on the bottom plate in a relatively vertical form, and the end face of the cylindrical battery contacts the heat exchange plate for heat exchange. On this basis, the connection between the heat exchange plate and the pipeline in the existing scheme is realized by a clamping method, which has a low connection strength. Utility Model Content

[0003] A main purpose of the present invention is to overcome at least one defect of the above-mentioned prior art and to provide a battery pack with better connection strength between the heat exchange plate and the pipeline and convenient installation and operation.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] According to one aspect of the utility model, a battery pack is provided, which includes a battery case, a cylindrical battery and a heat exchange system; the battery case includes a bottom plate located at the bottom; the cylindrical battery is arranged in the battery case, the cylindrical battery has two end faces arranged at intervals along the axial direction and respectively perpendicular to the axial direction, the end faces are perpendicular to the bottom plate, and the bottom plate is used to support the cylindrical battery; the heat exchange system includes a heat exchange plate and a circulation pipe; the large surface of the heat exchange plate is arranged perpendicularly relative to the bottom plate, and it includes a main body and a connecting part, the main body is in contact with the cylindrical battery for heat exchange, the main body has a heat exchange flow channel inside, the connecting part is connected to the main body and has a connecting surface, the connecting surface is provided with a connecting port, the connecting port is connected to the heat exchange flow channel, the opening direction of the connecting port is a first direction, and the first direction and the connecting surface have an angle of 10° to 90°; the circulation pipe is connected to the connecting port.

[0006] It can be seen from the above technical solution that the advantages and positive effects of the battery pack proposed by the utility model are:

[0007] The battery pack proposed in the utility model adopts a layout in which cylindrical batteries are lying and heat exchange plates are standing; the heat exchange plate includes a main body and a connecting part, the main body is in contact with the cylindrical battery for heat exchange, the main body has a heat exchange channel inside, the connecting part is connected to the main body and has a connecting surface, the connecting surface is provided with a connecting port, the connecting port is connected to the heat exchange channel, and the opening direction of the connecting port has an angle of 10° to 90° with the connecting surface; the circulation pipe is connected to the connecting port. Through the above-mentioned structural design, the utility model adopts the connecting part to realize the connection between the heat exchange plate and the circulation pipe, which can provide better connection strength. On this basis, the utility model designs the opening direction of the connecting port to have an angle of 10° to 90° with the connecting surface, which can reduce the difficulty of assembly operation and improve the assembly effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The various objects, features and advantages of the present invention will become more apparent by considering the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are only exemplary illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always represent the same or similar parts. Among them:

[0009] Figure 1 is a schematic diagram of a three-dimensional structure of a battery pack according to an exemplary embodiment;

[0010] Figure 2 yes Figure 1 An enlarged schematic diagram of part A in FIG.

[0011] Figure 3 yes Figure 2 A three-dimensional exploded schematic diagram of a partial structure shown;

[0012] Figure 4 yes Figure 2 A schematic diagram of the three-dimensional structure of the heat exchange plate shown;

[0013] Figure 5 is a schematic diagram of the three-dimensional structure of a heat exchange plate of a battery pack according to another exemplary embodiment.

[0014] The following are the descriptions of the reference numerals:

[0015] 100. Battery box;

[0016] 110. Bottom plate;

[0017] 1101. Module base plate;

[0018] 200. Cylindrical battery;

[0019] 300. Heat exchange plate;

[0020] 310. Ontology part;

[0021] 3201. Connecting surfaces;

[0022] 321. Liquid inlet connection;

[0023] 322. Liquid outlet connection;

[0024] 323. Connection port;

[0025] 330. Current collector;

[0026] 410. Inflow pipe;

[0027] 420. Outflow pipe;

[0028] 440. Elastic connecting section;

[0029] X. First direction;

[0030] Y. Second direction;

[0031] Z. Third direction. DETAILED DESCRIPTION

[0032] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and drawings therein are essentially for illustrative purposes rather than for limiting the present invention.

[0033] In the following description of different exemplary embodiments of the utility model, reference is made to the accompanying drawings, which form a part of the utility model and in which different exemplary structures, systems and steps that can implement multiple aspects of the utility model are shown by way of example. It should be understood that other specific schemes of components, structures, exemplary devices, systems and steps can be used, and structural and functional modifications can be made without departing from the scope of the utility model. Moreover, although the terms "above", "between", "within", etc. can be used in this specification to describe different exemplary features and elements of the utility model, these terms are used herein only for convenience, such as according to the direction of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the utility model.

[0034] See also Figure 1, which representatively shows a three-dimensional structural schematic diagram of the battery pack proposed by the utility model. In this exemplary embodiment, the battery pack proposed by the utility model is described by taking a vehicle-mounted battery as an example. It is easy for those skilled in the art to understand that in order to apply the relevant design of the utility model to other types of battery devices, various modifications, additions, substitutions, deletions or other changes are made to the specific embodiments described below, and these changes are still within the scope of the principle of the battery pack proposed by the utility model.

[0035] like Figure 1 As shown, in one embodiment of the present invention, the battery pack provided by the present invention includes a battery box 100, a cylindrical battery 200 and a heat exchange system. Figures 2 to 4 , Figure 2 A representative example is shown in Figure 1 An enlarged schematic diagram of part A in FIG. Figure 3 A representative example is shown in Figure 2 A three-dimensional exploded schematic diagram of a partial structure is shown, in which a connection portion and a connected flow pipe are specifically shown; Figure 4 The three-dimensional structural diagram of the heat exchange plate 300 is representatively shown in FIG. The structure, connection mode and functional relationship of each main component of the battery pack proposed by the utility model will be described in detail below in combination with the above drawings.

[0036] like Figures 1 to 4As shown, in one embodiment of the present invention, the battery case 100 includes a bottom plate 110 located at the bottom. The cylindrical battery 200 is arranged in the battery case 100, and the cylindrical battery 200 has two end faces arranged at intervals along the axial direction and respectively perpendicular to the axial direction, and the cylindrical battery 200 is arranged in a "lying" manner. The so-called "lying" is relative to the bottom plate 110, that is, the end face of the cylindrical battery 200 is perpendicular to the bottom plate 110. The heat exchange system includes a heat exchange plate 300 and a flow pipe. The large surface of the heat exchange plate 300 (that is, the surface with the largest surface area of ​​the heat exchange plate 300) is arranged vertically relative to the bottom plate 110, that is, the heat exchange plate 300 is arranged in a "standing" manner relative to the bottom plate 110. The heat exchange plate 300 includes a body 310 and a connection part. The body 310 contacts and exchanges heat with the cylindrical battery 200 (directly or indirectly via other structures). The body 310 has a heat exchange channel inside. The connection part is connected to the body 310 and has a connection surface 3201. The connection surface 3201 is provided with a connection port 323. The connection port 323 is connected to the heat exchange channel. The opening direction of the connection port 323 is a first direction X. The first direction X and the connection surface 3201 have an angle of 10° to 90°, such as 10°, 30°, 45°, 60°, 75°, 90°, etc., and in this embodiment, 90° is taken as an example, that is, the first direction X is perpendicular to the connection surface 3201, that is, the connection surface 3201 is parallel to the bottom plate 110. The flow pipe is connected to the connection port 323 in a screw connection manner. Through the above structural design, the utility model uses the connection part to achieve the connection between the heat exchange plate 300 and the flow pipe, which can provide better connection strength. On this basis, the utility model designs the opening direction of the connection port 323 to have an angle of 10° to 90° with the connection surface 3201, which can reduce the difficulty of assembly operation and improve the assembly effect.

[0037] like Figure 2 As shown, in one embodiment of the present invention, the end of the circulation pipe (such as the inflow pipe 410 shown in the figure) can be connected with a screw connection, and the screw connection is provided with an external thread. Correspondingly, the connection port 323 (such as the connection port 323 of the liquid inlet connection part 321) can be provided with an internal thread, thereby realizing the screw connection between the screw connection and the connection port 323. Through the above structural design, the present invention can use the screw connection to realize the screw connection between the circulation pipe and the heat exchange plate 300, with high connection strength and convenient operation. In some embodiments, the circulation pipe and the connection port 323 can also be screwed by other screw structures, which is not limited to this embodiment.

[0038] like Figures 2 to 4As shown, in one embodiment of the present invention, the heat exchange plate 300 may further include a collector 330, which is connected to the end of the main body 310 in the second direction Y, and the second direction Y is the length direction of the heat exchange plate 300, and the collector 330 has a manifold connected to the heat exchange flow channel. On this basis, the connection portion of the heat exchange plate 300 can be connected to the collector 330, and the connection port 323 is connected to the manifold, so that the connection port 323 is connected to the heat exchange flow channel via the manifold. Through the above structural design, the utility model can facilitate the setting of the connection portion, and can also facilitate its screw connection with the medium circulation pipeline, while avoiding affecting the main body 310 and the heat exchange flow channel inside it, ensuring that the heat exchange function of the heat exchange plate 300 is normally realized.

[0039] like Figures 2 to 4 As shown, in one embodiment of the present invention, the connection part 320 of the heat exchange plate 300 can be located on the large surface of the heat exchange plate 300. Through the above structural design, the present invention can facilitate the arrangement of the connection part 320 on the heat exchange plate 300, and facilitate the connection and assembly of the connection part 320 and the flow pipe.

[0040] like Figures 2 to 4 As shown, in one embodiment of the present utility model, the heat exchange flow channel of the heat exchange plate 300 may include an inflow flow channel and an outflow flow channel, the flow direction of the refrigerant in the inflow flow channel is to flow into the main body 310, and the flow direction of the refrigerant in the outflow flow channel is to flow out of the main body 310. On this basis, the connection part may include a liquid inlet connection part 321 and a liquid outlet connection part 322, the connection port 323 of the liquid inlet connection part 321 is connected to the inflow flow channel and can serve as the inlet of the refrigerant, and the connection port 323 of the liquid outlet connection part 322 is connected to the outflow flow channel and can serve as the outlet of the refrigerant. Among them, the circulation pipeline may include an inflow pipeline 410 and an outflow pipeline 420, the inflow pipeline 410 is connected to the connection port 323 of the liquid inlet connection part 321 in a screw connection manner, and the outflow pipeline 420 is connected to the connection port 323 of the liquid outlet connection part 322 in a screw connection manner. Through the above structural design, the utility model can screw the liquid inlet and outlet parts of the circulation pipeline to the heat exchange plate 300 via relatively independent connecting parts, further improving the connection strength and further reducing the difficulty of operation.

[0041] It should be understood that, for the inflow pipe 410 and the outflow pipe 420, the heat exchange plate 300 may also be provided with only one connecting portion, which is screwed to one of the inflow pipe 410 and the outflow pipe 420, and the other one may be connected to the heat exchange plate 300 in other ways, and is not limited to the above-mentioned embodiment.

[0042] like Figure 2 and Figure 3As shown, based on the structural design that the connection part includes a liquid inlet connection part 321 and a liquid outlet connection part 322, in one embodiment of the utility model, the heat exchange plate 300 also includes a collector 330, the collector 330 is connected to the end of the body part 310 in the second direction Y, and the collector 330 has a manifold connected to the heat exchange flow channel. The connection part can be connected to the collector 330, the connection port 323 is connected to the manifold, and the connection port 323 is connected to the heat exchange flow channel via the manifold. On this basis, the liquid inlet connection part 321 and the liquid outlet connection part 322 can be connected to the same collector 330, and are respectively located on both sides of the collector 330 in the third direction Z, and the third direction Z is parallel to the bottom plate 110 and perpendicular to the body part 310. Through the above structural design, the utility model can facilitate the screw connection of the inflow pipe 410 and the outflow pipe 420 with the corresponding connection parts when the heat exchange plate 300 adopts the design of single-side inflow and outflow of the refrigerant, and at the same time facilitate the separate arrangement of the two parts of the pipeline to avoid mutual blocking and interference. In some embodiments, the liquid inlet connection portion 321 and the liquid outlet connection portion 322 may also be located on the same side of a current collector 330 in the third direction Z. In addition, when the heat exchange plate 300 adopts a design of refrigerant double-sided inlet and outlet, the liquid inlet connection portion 321 and the liquid outlet connection portion 322 may be located on the same side of two current collectors 330 in the third direction Z, or on opposite sides, and are not limited to the above embodiments.

[0043] like Figures 2 to 4 As shown, based on the structural design that the connection portion includes a liquid inlet connection portion 321 and a liquid outlet connection portion 322, in one embodiment of the present utility model, the liquid inlet connection portion 321 and the liquid outlet connection portion 322 can be located at the same end of the heat exchange plate 300 in the second direction Y. In other words, the heat exchange plate 300 can adopt a design of single-side inlet and outlet of the refrigerant.

[0044] See also Figure 5 , Figure 5 2 represents a schematic diagram of the three-dimensional structure of a heat exchange plate 300 in another exemplary embodiment of a battery pack that can embody the principle of the present invention.

[0045] Different from Figures 2 to 4 In the embodiment shown, a structural design is adopted in which the liquid inlet connection part 321 and the liquid outlet connection part 322 are both located at the same end of the heat exchange plate 300. Figure 5 As shown, in one embodiment of the present invention, the liquid inlet connection portion 321 and the liquid outlet connection portion 322 may be respectively located at two ends of the heat exchange plate 300 in the second direction Y. In other words, the heat exchange plate 300 may adopt a design of refrigerant inlet and outlet on both sides.

[0046] like Figures 2 to 4As shown, in one embodiment of the present invention, the connection port 323 of the connection portion can be opened along the first direction X away from the bottom plate 110. Accordingly, since the space between the connection portion and the top plate is small, and the flow pipe is connected to the heat exchange plate 300 after the heat exchange plate 300 is installed on the bottom plate 110, the present invention can further reduce the difficulty of the screw connection operation through the above structural design.

[0047] In one embodiment of the present invention, the circulation conduit may be a combination of a metal conduit and an elastic connection structure. Specifically, a portion of the circulation conduit may be a metal conduit, and the other portion may be configured as an elastic connection section 440. Through the above structural design, the present invention can utilize the elastic deformation capability of the elastic connection section 440 to absorb the installation tolerance, further improving the structural stability and safety of the battery pack.

[0048] like Figure 2 As shown, based on the structural design that the circulation pipeline has an elastic connection section 440, in one embodiment of the present utility model, at least a portion of the circulation pipeline can be made of elastic material to form the elastic connection section 440. In some embodiments, in order to configure at least a portion of the two-year circulation pipeline as the elastic connection section 440, other structural designs can also be adopted, for example, at least a portion of the circulation pipeline can be made of a bellows structure to form the elastic connection section 440, which is not limited to this embodiment.

[0049] In one embodiment of the present invention, the heat exchange system can adopt a direct cooling form, and the heat exchange medium can be a refrigerant, that is, the heat exchange channel is suitable for the circulation of refrigerant, and the refrigerant is suitable for exchanging heat with the cylindrical battery 200 through the process of converting from liquid to gas. Specifically, the refrigerant enters the heat exchange channel in a liquid state, and exchanges heat with the cylindrical battery 200 in the heat exchange channel through the heat transfer of the heat exchange plate 300, that is, the cooling of the cylindrical battery 200 is achieved by evaporating heat of the refrigerant. Through the above structural design, when the heat exchange system adopts a direct cooling solution, due to factors such as the higher pipeline pressure generated by the refrigerant in the circulation pipeline, higher requirements will be placed on the connection strength between the circulation pipeline and the heat exchange plate 300. In this regard, the present invention uses a screw connection method to further meet the above connection strength requirements.

[0050] In one embodiment of the present invention, the cylindrical battery 200 may be a lithium iron battery. For example, the positive electrode active material of the cylindrical battery 200 may be lithium iron phosphate.

[0051] It should be noted that Figure 1Taking the illustrated embodiment as an example, when cylindrical batteries 200 are provided on both sides of the heat exchange plate 300 in the third direction Z, the heat exchange plate 300 and the cylindrical batteries 200 on both sides and other related structures can together constitute a battery module, and the battery module can be arranged on the module bottom plate 1101, and arranged on the bottom plate 110 of the battery box through the module bottom plate 1101. At this time, the relative arrangement relationship between each structure and the bottom plate 110 in this specification can be correspondingly understood as the relative arrangement relationship between each structure and the module bottom plate 1101. Through the above-mentioned structural design, the utility model can improve the integration of the battery module, which is conducive to improving the assembly efficiency. It should be understood that in some embodiments, the battery pack may not be provided with a module bottom plate 1101, and the battery module may also be directly arranged on the bottom plate 110 of the battery box 100.

[0052] It should be noted that the battery packs shown in the drawings and described in this specification are only a few examples of many types of battery packs that can adopt the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any details or any components of the battery packs shown in the drawings or described in this specification.

[0053] In summary, the battery pack proposed by the utility model adopts a layout in which the cylindrical battery 200 is lying and the heat exchange plate 300 is standing; the heat exchange plate 300 includes a main body 310 and a connecting part, the main body 310 is in contact with the cylindrical battery 200 for heat exchange, the main body 310 has a heat exchange flow channel inside, the connecting part is connected to the main body 310 and has a connecting surface 3201, the connecting surface 3201 is provided with a connecting port 323, the connecting port 323 is connected to the heat exchange flow channel, and the opening direction of the connecting port 323 and the connecting surface 3201 have an angle of 10° to 90°; the circulation pipeline is connected to the connecting port 323. Through the above structural design, the utility model adopts the connecting part 320 to realize the connection between the heat exchange plate 300 and the circulation pipeline, which can provide better connection strength. On this basis, the utility model designs the opening direction of the connecting port 323 to have an angle of 10° to 90° with the connecting surface 3201, which can reduce the difficulty of assembly operation and improve the assembly effect.

[0054] The exemplary embodiments of the battery pack proposed by the utility model are described and / or illustrated in detail above. However, the embodiments of the utility model are not limited to the specific embodiments described here. On the contrary, the components and / or steps of each embodiment can be used independently and separately from other components and / or steps described here. Each component and / or each step of an embodiment can also be used in combination with other components and / or steps of other embodiments. When introducing the elements / components / etc. described and / or illustrated here, the terms "one", "one" and "above" are used to indicate the presence of one or more elements / components / etc. The terms "comprising", "including" and "having" are used to express the meaning of open inclusion and mean that in addition to the listed elements / components / etc., there may be additional elements / components / etc. In addition, the terms "first" and "second" in the claims and the specification are used only as marks and are not numerical restrictions on their objects.

[0055] Although the battery pack of the present invention has been described according to different specific embodiments, those skilled in the art will recognize that the implementation of the present invention can be modified within the spirit and scope of the claims.

Claims

1. A battery pack, characterized in that: include: A battery box, including a bottom plate located at the bottom; A cylindrical battery is arranged in the battery box, wherein the cylindrical battery has two end faces arranged at intervals along the axial direction and respectively perpendicular to the axial direction, wherein the end faces are perpendicular to the bottom plate, and the bottom plate is used to support the cylindrical battery; as well as Heat exchange system, including: A heat exchange plate, whose large surface is arranged vertically relative to the bottom plate, comprising a main body and a connecting portion, wherein the main body contacts and exchanges heat with the cylindrical battery, wherein a heat exchange channel is provided inside the main body, wherein the connecting portion is connected to the main body and has a connecting surface, wherein a connecting port is provided on the connecting surface, wherein the connecting port is connected to the heat exchange channel, wherein an opening direction of the connecting port is a first direction, wherein an angle of 10° to 90° is formed between the first direction and the connecting surface; and The flow pipe is connected to the connection port.

2. The battery pack according to claim 1, characterized in that: The end of the flow pipe is connected with a threaded connection piece, and the threaded connection piece is threadedly connected to the connection port.

3. The battery pack according to claim 1, characterized in that: The heat exchange plate also includes a collector, which is connected to the end of the main body in a second direction, the second direction being the length direction of the heat exchange plate, and the collector has a collecting cavity connected to the heat exchange channel; wherein the connecting portion is connected to the collector, the connecting port is connected to the collecting cavity, and is connected to the heat exchange channel via the collecting cavity.

4. The battery pack according to claim 1, characterized in that: The connecting portion is located on the large surface of the heat exchange plate.

5. The battery pack according to claim 1, characterized in that: The heat exchange channel includes an inlet channel and an outlet channel; wherein the connection part includes a liquid inlet connection part and a liquid outlet connection part, the connection port of the liquid inlet connection part is connected to the inlet channel and serves as the inlet of the heat exchange channel, and the connection port of the liquid outlet connection part is connected to the outflow channel and serves as the outlet of the heat exchange channel; wherein the circulation pipe includes an inlet pipe and an outflow pipe, the inlet pipe is connected to the connection port of the liquid inlet connection part in a threaded manner, and the outflow pipe is connected to the connection port of the liquid outlet connection part in a threaded manner.

6. The battery pack according to claim 5, characterized in that: The liquid inlet connection portion and the liquid outlet connection portion are both located at the same end of the heat exchange plate in the second direction, and the second direction is the length direction of the heat exchange plate; or The liquid inlet connection portion and the liquid outlet connection portion are respectively located at two ends of the heat exchange plate in the second direction.

7. The battery pack according to claim 5, characterized in that: The heat exchange plate also includes a collector, which is connected to the end of the main body in a second direction, the second direction being the length direction of the heat exchange plate, and the collector has a collecting cavity connected to the heat exchange channel; wherein the connecting portion is connected to the collector, the connecting port is connected to the collecting cavity, and is connected to the heat exchange channel via the collecting cavity; wherein the liquid inlet connecting portion and the liquid outlet connecting portion are both connected to the same collector, and are respectively located on both sides of the collector in a third direction, and the third direction is parallel to the bottom plate and perpendicular to the main body.

8. The battery pack according to claim 1, characterized in that: The connection port opens along the first direction away from the bottom plate.

9. The battery pack according to claim 1, characterized in that: At least a portion of the flow conduit is configured as an elastic connection section; wherein: At least part of the flow conduit is made of elastic material to form the elastic connecting section; and / or At least a portion of the flow conduit is a bellows structure to form the elastic connecting section.

10. The battery pack according to claim 1, characterized in that: The heat exchange system is a direct cooling heat exchange system, the heat exchange channel is suitable for the circulation of refrigerant, and the refrigerant is suitable for exchanging heat with the cylindrical battery through a process of converting from liquid to gas.

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