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, a heat exchange plate and a connecting plate, the battery box body comprises a bottom plate; the cylindrical battery is arranged in the battery box body, and the axis of the cylindrical battery is parallel to the bottom plate; the heat exchange plate is vertically arranged relative to the bottom plate and is in contact with the end surface of the cylindrical battery; the connecting plate is connected to the heat exchange plate and is fixedly connected with the cylindrical surface of the cylindrical battery, and the heat conductivity coefficient of the connecting plate is 40W / (m.k)-400W / (m.k). Through the structural design, the connecting plate can be utilized to be in contact with the cylindrical surface of the cylindrical battery for heat exchange, and the part of heat is transferred to the heat exchange plate, so that the defect that the heat exchange area between the end surface of the lying cylindrical battery and the vertical heat exchange plate is small is overcome, and the heat exchange performance of battery packs of related types is improved. In addition, the structural strength of the battery pack can be enhanced by using the connecting plate.

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 of battery packs, some battery packs adopt the design of lying cylindrical batteries, that is, the axis 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. However, due to the small heat exchange area between the end face of the cylindrical battery and the heat exchange plate, the heat exchange performance of the above-mentioned type of battery pack is poor. 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 provide a battery pack with better heat exchange performance.

[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, a heat exchange plate and a connecting plate; the battery case includes a bottom plate; the cylindrical battery is arranged in the battery case, the cylindrical battery includes a cylindrical surface and two end surfaces, the two end surfaces are arranged at intervals and are respectively perpendicular to the axis of the cylindrical battery, the cylindrical surface is connected to the two end surface diameters, and the axis is parallel to the bottom plate; the heat exchange plate is arranged vertically relative to the bottom plate, the heat exchange plate is in contact with the end surface of the cylindrical battery; the connecting plate is connected to the heat exchange plate and is fixedly connected to the cylindrical surface of the cylindrical battery, and the thermal conductivity of the connecting plate is 40W / (m·k) to 400W / (m·k).

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

[0007] The battery pack proposed by the utility model includes a battery case, a cylindrical battery, a heat exchange plate and a connecting plate; the battery case includes a bottom plate; the cylindrical battery is arranged in the battery case, and the axis of the cylindrical battery is parallel to the bottom plate; the heat exchange plate is arranged vertically relative to the bottom plate, and the heat exchange plate is in contact with the end face of the cylindrical battery; the connecting plate is connected to the heat exchange plate and fixedly connected to the cylindrical surface of the cylindrical battery, and the thermal conductivity of the connecting plate is 40W / (m·k)~400W / (m·k). Through the above-mentioned structural design, the utility model can utilize the heat exchange between the connecting plate and the cylindrical surface of the cylindrical battery, and transfer this part of the heat to the heat exchange plate, thereby compensating for the small heat exchange area between the end face of the lying cylindrical battery and the upright heat exchange plate, and improving the heat exchange performance of the relevant type of battery pack. In addition, the utility model can also use the connecting plate to strengthen the structural strength of the battery pack. 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 A schematic diagram of a three-dimensional structure of a partial structure of a battery pack is shown;

[0011] Figure 3 yes Figure 2 A top view of

[0012] Figure 4 yes Figure 2 Side view of

[0013] Figure 5 yes Figure 2 A schematic diagram of the three-dimensional structure of a cylindrical battery is shown;

[0014] Figure 6 is a top view showing a partial structure of a battery pack according to another exemplary embodiment;

[0015] Figure 7 is a schematic three-dimensional structural diagram showing a partial structure of a battery pack according to another exemplary embodiment;

[0016] Figure 8 yes Figure 7 Schematic diagram of three-dimensional decomposition.

[0017] The following are the descriptions of the reference numerals:

[0018] 100. Battery box;

[0019] 110. Bottom plate;

[0020] 1101. Module base plate;

[0021] 200. Cylindrical battery;

[0022] 201. Battery pack;

[0023] 202. Battery column;

[0024] 210. First end surface;

[0025] 220. Second end surface;

[0026] 230. Cylinder;

[0027] 300. Heat exchange plate;

[0028] 310. First surface;

[0029] 400. Connecting plate;

[0030] D.Thickness;

[0031] L1. Length;

[0032] L2.Total length;

[0033] O. Axis;

[0034] X. First direction;

[0035] Y. Second direction;

[0036] Z. Third direction. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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, a heat exchange plate 300 and a connecting plate 400. Figures 2 to 4 , Figure 2 , a three-dimensional structural schematic diagram of a partial structure of a battery pack is representatively shown, wherein a combined structure of a partial cylindrical battery 200, a heat exchange plate 300 and a connecting plate 400 is specifically shown; Figure 3 A representative example is shown in Figure 2 A top view of Figure 4 A representative example is shown in Figure 2 Side view of

[0041] Figure 5 2 shows a three-dimensional structural diagram of a cylindrical battery 200. The following will be combined with the above drawings to describe in detail the structure, connection method and functional relationship of the main components of the battery pack proposed by the present invention.

[0042] like Figures 1 to 5As shown, in one embodiment of the present invention, the battery case 100 includes a bottom plate 110. The cylindrical battery 200 is disposed in the battery case 100, and the cylindrical battery 200 is arranged in a "lying" manner, and the so-called "lying" is relative to the bottom plate 110, that is, the axis O of the cylindrical battery 200 is parallel to the bottom plate 110. Specifically, the cylindrical battery 200 includes a cylindrical surface 230 and two end surfaces (for example, a first end surface 210 and a second end surface 220), the two end surfaces are arranged at intervals and are respectively perpendicular to the axis O of the cylindrical battery 200, the cylindrical surface 230 is connected between the two end surfaces, and the axis O of the cylindrical battery 200 is parallel to the bottom plate 110. 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, and the heat exchange plate 300 is in contact with the end surface of the cylindrical battery 200 (it can be directly in contact or indirectly in contact through other structures). The connecting plate 400 is connected to the heat exchange plate 300, and the connecting plate 400 is fixedly connected to the cylindrical surface 230 (i.e., cylindrical surface) of the cylindrical battery 200, and the thermal conductivity of the connecting plate 400 is 40W / (m·k) to 400W / (m·k), such as 40W / (m·k), 50W / (m·k), 80W / (m·k), 100W / (m·k), 200W / (m·k), 400W / (m·k), etc. Through the above structural design, the utility model can utilize the connecting plate 400 to contact and exchange heat with the cylindrical surface 230 of the cylindrical battery 200, and transfer part of the heat to the heat exchange plate 300, thereby compensating for the small heat exchange area between the end face of the lying cylindrical battery 200 and the upright heat exchange plate 300, and improving the heat exchange performance of the relevant type of battery pack. In addition, the utility model can also utilize the connecting plate 400 to strengthen the structural strength of the battery pack.

[0043] In one embodiment of the present invention, the material of the connecting plate 400 can be steel, aluminum, copper, etc. Through the above design, since the material selection of the connecting plate 400 will affect its thermal conductivity, the present invention selects the above suitable material to ensure that the thermal conductivity of the connecting plate 400 meets the thermal conductivity requirements.

[0044] like Figure 4 As shown, in one embodiment of the present invention, the thickness D of the connecting plate 400 can be 0.5 mm to 2 mm, such as 0.5 mm, 0.1 mm, 1.5 mm, 2 mm, etc. Through the above structural design, the present invention can avoid the thickness D of the connecting plate 400 being too small, which makes the supporting effect not obvious, and can also avoid the thickness D of the connecting plate 400 being too large, which increases the space occupation and weight. In some embodiments, the thickness D of the connecting plate 400 can also be less than 0.5 mm, or can be greater than 2 mm, such as 0.49 mm, 2.05 mm, etc., which is not limited to this embodiment.

[0045] In one embodiment of the present invention, the heat exchange plate 300 and the connecting plate 400 can be connected by thermal conductive bonding. Through the above structural design, the present invention can improve the heat exchange effect between the heat exchange plate 300 and the connecting plate 400 while achieving fixed connection between the two, so that the heat of the cylindrical battery 200 can be transferred to the heat exchange plate 300 via the connecting plate 400, thereby improving the heat conduction effect.

[0046] In one embodiment of the present invention, the connecting plate 400 and the cylindrical surface 230 of the cylindrical battery 200 can be fixedly connected via an adhesive layer. On this basis, the thermal conductivity of the adhesive layer can be greater than 1W / (m·k). Through the above structural design, the present invention can further improve the thermal conductivity between the connecting plate 400 and the cylindrical battery 200.

[0047] In one embodiment of the present invention, the connecting plate 400 and the cylindrical surface 230 of the cylindrical battery 200 can be fixedly connected via an adhesive layer. On this basis, the thickness of the adhesive layer can be 0.1mm to 0.5mm, such as 0.1mm, 0.2mm, 0.3mm, 0.5mm, etc. Through the above-mentioned structural design, the present invention can avoid the thickness of the adhesive layer being too small to meet the connection requirements, and at the same time can avoid the thickness of the adhesive layer being too large to increase space occupancy and weight. In some embodiments, the thickness of the adhesive layer may also be less than 0.1mm, or may be greater than 0.5mm, such as 0.09mm, 0.51mm, etc., and is not limited to this embodiment.

[0048] like Figure 2 and Figure 4 As shown, in one embodiment of the present invention, the heat exchange plate 300 has a first surface 310, which is perpendicular to the axis O of the cylindrical battery 200, and the first surface 310 is in contact with the end surface of the cylindrical battery 200. On this basis, the connecting plate 400 is connected to the first surface 310 of the heat exchange plate 300. Through the above structural design, the present invention can facilitate the connection between the connecting plate 400 and the heat exchange plate 300. In some embodiments, the connecting plate 400 can also be connected to other positions of the heat exchange plate 300, for example, the connecting plate 400 can be connected to the top edge of the heat exchange plate 300 (that is, the edge of one side of the heat exchange plate 300 facing away from the bottom plate 110), which is not limited to this embodiment.

[0049] like Figures 2 to 3As shown, in one embodiment of the utility model, the cylindrical battery 200 includes a shell and a battery cell, the battery cell is arranged in the shell, and the battery cell includes a positive electrode tab and a negative electrode tab. Among them, in the first direction X parallel to the axis O of the cylindrical battery 200, the battery cell has an opposite first end and a second end, the positive electrode tab and the negative electrode tab are both located at the first end, and the cylindrical battery 200 has an opposite first end face 210 and a second end face 220, the first end face 210 corresponds to the first end, and the second end face 220 corresponds to the second end. On this basis, the heat exchange plate 300 contacts the second end face 220 of the cylindrical battery 200. Through the above-mentioned structural design, since there are other structures such as electrode lead-out terminals on one side of the first end face 210 of the cylindrical battery 200, the utility model can avoid interference between the heat exchange plate 300 and structures such as the electrode lead-out terminals of the cylindrical battery 200.

[0050] like Figure 2 and Figure 3 As shown, based on the structural design that the heat exchange plate 300 contacts the second end face 220 of the cylindrical battery 200, in one embodiment of the present invention, along the first direction X, the connecting plate 400 may only cover a partial area of ​​the cylindrical surface 230 of the cylindrical battery 200, so that the portion of the cylindrical surface 230 adjacent to the first end face 210 is exposed outside the connecting plate 400. Through the above structural design, since the shell of the cylindrical battery 200 has a welding mark in the connection area between the first end face 210 and the cylindrical surface 230, and the shell is not provided with an insulating layer at the weld, the present invention can avoid the contact between the connecting plate 400 and the portion of the shell, thereby ensuring the insulation effect, and at the same time, can leave a position for electrical connection to avoid structural interference with related structures (such as conductive bars, etc.).

[0051] See also Figure 6 , Figure 6 1 represents a top view of a partial structure of a battery pack in another exemplary embodiment that can embody the principles of the present invention, in which a combined structure of a portion of a cylindrical battery 200, a heat exchange plate 300 and a connecting plate 400 is specifically shown.

[0052] Different from Figure 2 and Figure 3 In the embodiment shown, the connecting plate 400 is used to cover a part of the cylindrical surface 230. Figure 6 As shown, in one embodiment of the present invention, along the first direction X, the connecting plate 400 can cover the entire area of ​​the cylindrical surface 230 of the cylindrical battery 200. The above design can be suitable for the case where the welding mark between the first end surface 210 and the cylindrical surface 230 is located on the first end surface 210 instead of the cylindrical surface 230, and can also be suitable for the case where the welding mark is located on the cylindrical surface 230 but an insulating layer is provided on the surface.

[0053] like Figure 3As shown, in one embodiment of the present invention, the connecting plate 400 has a contact surface fixedly connected to the cylindrical surface 230 of the cylindrical battery 200, and the contact surface may be a contoured structure matching the shape of a portion of the cylindrical surface 230. Through the above structural design, the present invention can increase the contact area between the connecting plate 400 and the cylindrical surface 230 of the cylindrical battery 200, thereby improving the heat exchange effect. In some embodiments, the connecting plate 400 may also be a flat plate, that is, the surface of the connecting plate 400 facing the cylindrical battery 200 may be a plane.

[0054] See also Figure 7 and Figure 8 , Figure 7 , a three-dimensional schematic diagram of a partial structure of a battery pack in another exemplary embodiment that can embody the principle of the present invention is representatively shown, wherein a combined structure of a battery pack 201, a heat exchange plate 300, and a connecting plate 400 is specifically shown; Figure 8 A representative example is shown in Figure 7 Schematic diagram of three-dimensional decomposition.

[0055] like Figure 7 and Figure 8 As shown, in one embodiment of the present invention, the battery pack proposed by the present invention may include at least one battery group 201, the battery group 201 includes at least two layers of battery columns 202 arranged along a third direction Z, the third direction Z is perpendicular to the bottom plate 110, and the battery column 202 includes at least two cylindrical batteries 200 arranged along a second direction Y, the second direction Y is parallel to the bottom plate 110 and parallel to the heat exchange plate 300. On this basis, the connecting plate 400 can be located between two adjacent layers of battery columns 202 belonging to the same battery group 201, and the two side surfaces of the connecting plate 400 are respectively fixedly connected to the cylindrical surfaces 230 of the cylindrical batteries 200 of the two layers of battery columns 202. Through the above structural design, the present invention can use the connecting plate 400 to achieve contact heat exchange of the cylindrical surfaces 230 of the cylindrical batteries 200 of the two adjacent layers of battery columns 202, which is conducive to reducing the number of components and simplifying the complexity of the structure.

[0056] like Figure 8 As shown, based on the structural design that the connecting plate 400 is located between two adjacent layers of battery columns 202 belonging to the same battery pack 201, in one embodiment of the present utility model, the connecting plate 400 can be wavy, that is, the two side surfaces of the connecting plate 400 facing the two layers of battery columns 202 are respectively contoured structures that match the shape of the partial cylindrical surface 230 of the corresponding cylindrical battery 200. Through the above structural design, the present utility model can increase the contact area between the connecting plate 400 and the cylindrical surface 230 of the cylindrical battery 200, improve the heat exchange effect, and at the same time help to reduce the distance between the two adjacent layers of battery columns 202 in the third direction Z, and reduce the space occupied by the battery pack 201 in the third direction Z.

[0057] like Figure 7 and Figure 8 As shown, in one embodiment of the present invention, the battery pack proposed by the present invention may include at least two battery groups 201, and at least two battery groups 201 are arranged along the first direction X. On this basis, the end faces (such as the second end faces 220) of the cylindrical batteries 200 of two adjacent battery groups 201 can be in contact with the opposite sides of the heat exchange plate 300 (the first surfaces 310 on both sides of the heat exchange plate 300 on both sides) respectively. Through the above structural design, the present invention can use the heat exchange plate 300 to achieve contact heat exchange with the end faces of the cylindrical batteries 200 of two adjacent battery groups 201, which is conducive to reducing the number of components and simplifying the complexity of the structure.

[0058] 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.

[0059] It should be noted that Figure 1 Taking the illustrated embodiment as an example, when cylindrical batteries 200 are provided on both sides of the heat exchange plate 300 in the first direction X, 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.

[0060] 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.

[0061] In summary, the battery pack proposed in the present invention includes a battery case 100, a cylindrical battery 200, a heat exchange plate 300 and a connecting plate 400; the battery case 100 includes a bottom plate 110; the cylindrical battery 200 is arranged in the battery case 100, and the axis O of the cylindrical battery 200 is parallel to the bottom plate 110; the heat exchange plate 300 is arranged vertically relative to the bottom plate 110, and the heat exchange plate 300 is in contact with the end surface of the cylindrical battery 200; the connecting plate 400 is connected to the heat exchange plate 300, and is fixedly connected to the cylindrical surface 230 of the cylindrical battery 200, and the thermal conductivity of the connecting plate 400 is 40W / (m·k)~400W / (m·k). Through the above structural design, the utility model can utilize the connection plate 400 to contact and exchange heat with the cylindrical surface 230 of the cylindrical battery 200, and transfer this part of the heat to the heat exchange plate 300, thereby compensating for the small heat exchange area between the end surface of the lying cylindrical battery 200 and the vertical heat exchange plate 300, and improving the heat exchange performance of the relevant type of battery pack. In addition, the utility model can also utilize the connection plate 400 to strengthen the structural strength of the battery pack.

[0062] 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.

[0063] 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; A cylindrical battery is arranged in the battery box, the cylindrical battery comprises a cylindrical surface and two end surfaces, the two end surfaces are arranged at intervals and are respectively perpendicular to the axis of the cylindrical battery, the cylindrical surface is connected between the two end surfaces, and the axis is parallel to the bottom plate; A heat exchange plate is arranged vertically relative to the bottom plate, and the heat exchange plate is in contact with the end surface of the cylindrical battery; as well as A connecting plate is connected to the heat exchange plate and fixedly connected to the cylindrical surface of the cylindrical battery. The thermal conductivity of the connecting plate is 40W / (m·k) to 400W / (m·k).

2. The battery pack according to claim 1, characterized in that: The thickness of the connecting plate is 0.5 mm to 2 mm.

3. The battery pack according to claim 1, characterized in that: The heat exchange plate and the connecting plate are connected by thermal conductive bonding.

4. The battery pack according to claim 1, characterized in that: The connecting plate is fixedly connected to the cylindrical surface of the cylindrical battery via an adhesive layer.

5. The battery pack according to claim 4, characterized in that: The thermal conductivity of the adhesive layer is greater than 1 W / (m·k).

6. The battery pack according to claim 4, characterized in that: The thickness of the adhesive layer is 0.1 mm to 0.5 mm.

7. The battery pack according to claim 1, characterized in that: The heat exchange plate has a first surface, the first surface is perpendicular to the axis of the cylindrical battery, and the first surface is in contact with the end surface of the cylindrical battery; wherein the connecting plate is connected to the first surface.

8. The battery pack according to claim 1, characterized in that: The cylindrical battery includes a shell and a battery cell, wherein the battery cell is arranged in the shell, and the battery cell includes a positive electrode tab and a negative electrode tab. In a first direction parallel to the axis, the battery cell has a first end and a second end opposite to each other, and the positive electrode tab and the negative electrode tab are both located at the first end. The cylindrical battery has a first end face and a second end face opposite to each other, and the first end face corresponds to the first end, and the second end face corresponds to the second end. The heat exchange plate contacts the second end face, and along the first direction, the connecting plate covers a partial area of ​​the cylindrical surface of the cylindrical battery, and a portion of the cylindrical surface adjacent to the first end face is exposed outside the connecting plate.

9. The battery pack according to claim 1, characterized in that: Along a first direction parallel to the axis, the connecting plate covers the entire area of ​​the cylindrical surface of the cylindrical battery.

10. The battery pack according to claim 1, characterized in that: The connecting plate has a contact surface fixedly connected to the cylindrical surface of the cylindrical battery, and the contact surface is a contoured structure matching the shape of a portion of the cylindrical surface.

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