Battery pack and energy storage equipment

Abstract

The utility model provides a battery pack and energy storage equipment. The battery pack comprises a lower shell, a cold plate arranged in the lower shell, and a supporting structure clamped between the cold plate and the bottom wall of the lower shell, the supporting structure comprises a first supporting body and a second supporting body, the hardness of the first supporting body is larger than that of the second supporting body, the first supporting body is provided with a through hole, and the second supporting body is arranged in the through hole. According to the battery pack disclosed by the utility model, the hardness of the first supporting body is greater than that of the second supporting body in the supporting structure, and the second supporting body is arranged in the through hole of the first supporting body, so that the supporting structure has better supporting and buffering effects, the cold plate is prevented from being deformed, and the use effect of the cold plate can be ensured; and the safety of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a battery pack. The utility model also relates to an energy storage device provided with the battery pack. Background Art

[0002] With the promotion and application of power batteries, the safety of battery packs has also received more and more attention. In order to improve the safety of battery packs, the internal structure of the battery pack has been optimized and improved in many ways. For example, a cold plate is set at the bottom of the lower shell, the cold plate is located at the bottom of the battery module, and an elastic integrated support buffer pad is set between the cold plate and the bottom of the lower shell to reduce the impact of external impact on the battery module.

[0003] However, in the actual use of the battery pack, since the cold plate battery module is arranged on the cold plate, the cold plate bears more force, and the bottom of the main load-bearing area of ​​the cold plate is suspended in the air and is prone to concave deformation. Therefore, the buffer pad with only a buffering effect cannot meet the use requirements, which is not conducive to the use effect of the cold plate, and further to the safety of the battery pack. Utility Model Content

[0004] In view of this, the utility model aims to provide a battery pack to improve the use effect of the cold plate and help improve safety.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A battery pack comprises a lower shell, a cold plate disposed in the lower shell, and a support structure sandwiched between the cold plate and a bottom wall of the lower shell;

[0007] The support structure includes a first support body and a second support body, the hardness of the first support body is greater than the hardness of the second support body, and the first support body has a through hole, and the second support body is arranged in the through hole.

[0008] Further, the first support body is rectangular and is a plurality of support bodies spaced between the cold plate and the bottom wall of the lower shell; and / or,

[0009] The through hole is a long strip hole, and the second support body is arranged in the shape of the through hole.

[0010] Furthermore, the first support body is made of EPP foam or polypropylene microporous foam material, and the second support body is made of silicone foam; and / or,

[0011] The cold plate comprises a top plate and a bottom plate which are connected by buckling, the bottom plate has an abutting portion abutting against the top plate, and a protruding portion protruding in a direction away from the top plate, the protruding portion and the top plate surround a flow channel;

[0012] The first support body is disposed between the protruding portion and the bottom wall of the lower shell, and the second support body is disposed between the abutting portion and the bottom wall of the lower shell.

[0013] Further, it includes a battery module disposed in the lower housing;

[0014] The battery module is connected to the cold plate via heat conductive adhesive.

[0015] Furthermore, the edge of the cold plate is connected to the lower shell by penetration welding; and / or,

[0016] A beam body is provided in the lower shell body, and the beam body divides the lower shell body into a plurality of installation spaces. The battery module is arranged in the installation space, and the beam body is connected to the cold plate by flow drill screws, and a structural sealant is provided therebetween.

[0017] Furthermore, the beam body and / or the lower shell body are provided with a protrusion protruding into the installation space;

[0018] The end plate of the battery module is connected to the convex block via a connecting piece, and an epoxy gasket is provided between the end plate and the convex block.

[0019] Furthermore, the bump is provided with a connection hole, and the epoxy gasket is arranged corresponding to the connection hole;

[0020] A threaded sleeve is embedded in the connecting hole, and the connecting piece is a bolt passing through the end plate, and the bolt is threadedly connected to the threaded sleeve.

[0021] Furthermore, the portion where the bolt and the threaded sleeve are threadedly connected is coated with thread fastening glue.

[0022] Furthermore, a conical gasket is sandwiched between the head of the bolt and the end plate.

[0023] Compared with the prior art, the utility model has the following advantages:

[0024] The battery pack described in the utility model makes the hardness of the first support body in the support structure greater than the hardness of the second support body, and can improve the support effect of the cold plate through the first support body, and can play a better compression buffer effect through the second support body, which is beneficial to prevent the cold plate from deforming, thereby ensuring the use effect of the cold plate and further improving the safety of the battery pack.

[0025] In addition, the first support body is rectangular and is arranged in multiple intervals on the cold plate and the bottom wall bracket of the lower shell, which is convenient for arrangement and implementation, and has a simple structure; the through hole is a long hole, and the second support body is arranged in accordance with the through hole, which is conducive to improving the support and buffering effect after the first support body and the second support body cooperate. The first support body is made of EPP foam or polypropylene microporous foam material, which has a good support effect, and the second support body is made of silicon foam, which is conducive to improving the elastic buffering effect and is easy to process and shape the first support body and the second support body; the top plate and the bottom plate in the cold plate, as well as the abutment part and the protrusion part are arranged, which is conducive to forming a flow channel in the cold plate; the position between the first support body and the second support body and the protrusion part and the abutment part is arranged, which is conducive to increasing the height of the second support body, thereby improving the buffering effect of the second support body.

[0026] In addition, the battery module is connected to the cold plate through thermal conductive adhesive. The thermal conductive adhesive has good thermal conductivity and can transfer the temperature of the cold plate to the battery module, which plays a good temperature control function, ensures the performance of the battery cell, and further reduces the risk of thermal runaway of the battery cell; the thermal conductive adhesive is also conducive to the connection between the battery module and the cold plate, and is convenient for the disassembly and replacement of the battery module. The edge of the cold plate is connected to the lower shell by penetration welding. This connection method has the advantages of high efficiency and low consumption, low welding temperature, small residual stress of the joint, small deformation of the welding workpiece, and environmental friendliness; the setting of the beam body in the lower shell is not only conducive to forming an installation space for installing the battery module, but also the beam body and the cold plate are connected by flow drill screws, and the setting of structural sealant between the two are conducive to improving the connection strength and sealing effect.

[0027] Furthermore, the setting of the protrusion is conducive to the installation of the end plate of the battery module, and the setting of the epoxy gasket between the end plate and the protrusion is conducive to preventing the battery module from directly contacting the lower shell, which has a good heat insulation effect. The connection hole on the protrusion and the setting of the screw sleeve are conducive to improving the connection strength and firmness between the end plate and the protrusion. The part where the bolt and the screw sleeve are screwed is coated with thread fastener, which is conducive to preventing the bolt from loosening due to torque attenuation, thereby having better connection reliability. A conical gasket is sandwiched between the head of the bolt and the end plate, which is not only easy to arrange, but also can improve the connection effect of the bolt.

[0028] In addition, another object of the present invention is to provide an energy storage device, in which the battery pack as described above is provided.

[0029] The energy storage device described in the utility model is beneficial to improving the performance and safety of use by providing the battery pack as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0031] Figure 1 A schematic diagram of a portion of the internal structure of a battery pack according to an embodiment of the present utility model;

[0032] Figure 2 This is a schematic diagram of the structure of the support structure described in an embodiment of the utility model;

[0033] Figure 3 It is a partial cross-sectional view of the cold plate, the lower shell and the supporting structure according to the embodiment of the utility model;

[0034] Figure 4 It is a schematic structural diagram of the lower housing and the cold plate according to an embodiment of the utility model at one viewing angle;

[0035] Figure 5 It is a schematic structural diagram of the lower housing and the cold plate according to an embodiment of the utility model from another perspective;

[0036] Figure 6 This is a schematic diagram of the structure of the cold plate according to an embodiment of the utility model;

[0037] Figure 7 It is a partial cross-sectional view of the end plate in the connected state according to the embodiment of the utility model;

[0038] Figure 8 It is a schematic structural diagram of bolts for connecting end plates according to an embodiment of the utility model.

[0039] Description of reference numerals:

[0040] 1. Lower housing; 2. Cold plate; 3. Battery module; 4. Bolts; 5. Support structure;

[0041] 101, beam body; 102, weld; 103, flow drill screw; 104, bump;

[0042] 200, flow channel; 201, top plate; 202, bottom plate;

[0043] 301, end plate;

[0044] 401, conical gasket; 402, epoxy gasket; 403, screw sleeve; 404, thread fastening glue;

[0045] 501, a first support body; 502, a second support body. DETAILED DESCRIPTION

[0046] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0047] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0048] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0049] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0050] This embodiment relates to a battery pack. In terms of overall structure, the battery pack includes a lower shell 1 , a cold plate 2 disposed in the lower shell 1 , and a support structure 5 sandwiched between the cold plate 2 and the bottom wall of the lower shell 1 .

[0051] The support structure 5 includes a first support body 501 and a second support body 502 . The hardness of the first support body 501 is greater than that of the second support body 502 . The first support body 501 has a through hole, and the second support body 502 is disposed in the through hole.

[0052] The battery pack of this embodiment makes the hardness of the first support body in the support structure greater than the hardness of the second support body, so that the first support body can improve the support effect on the cold plate, and the second support body can have a better compression buffer effect, which is beneficial to prevent the cold plate 2 from deforming, thereby ensuring the use effect of the cold plate 2 and further improving the safety of the battery pack.

[0053] Based on the above overall introduction, part of the structure of the battery pack of this embodiment is as follows Figure 1 and Figure 2 as well as Figure 5 and Figure 6 As shown in , the cold plate 2 in this embodiment is an integrated plate, a cavity is formed between the bottom of the cold plate 2 and the bottom wall of the lower shell 1, and the support structure 5 is specifically located in the cavity.

[0054] As a preferred embodiment, the first support body 501 is rectangular and is provided in a plurality of spaces between the cold plate 2 and the bottom wall of the lower shell 1, which is convenient for arrangement and implementation, and has a simple structure and good supporting effect. The through hole in this embodiment is a long hole, and the second support body 502 is provided in accordance with the shape of the through hole. Such a setting is conducive to improving the supporting and buffering effect after the first support body 501 and the second support body 502 cooperate.

[0055] In this embodiment, the first support body 501 and the second support body 502 can be prepared using materials in the prior art. Preferably, the first support body 501 is made of EPP foam or polypropylene microporous foam material, which has a good support effect. The second support body 502 is made of silicon foam, which is conducive to improving the elastic buffering effect and is easy to process and shape the first support body 501 and the second support body 502. Among them, EPP foam is foamed polypropylene in the prior art.

[0056] like Figure 3 As shown in , the cold plate 2 in this embodiment includes a top plate 201 and a bottom plate 202 that are connected by snapping, the bottom plate 202 has an abutting portion that abuts against the top plate 201, and a protruding portion that protrudes in a direction away from the top plate 201, and the protruding portion and the top plate 201 surround and form a flow channel 200. Among them, the top plate 201 is a flat plate, which is convenient for the installation of the battery module 3, and the bottom plate 202 is provided with a protruding portion, which is convenient for improving the utilization rate of the cavity and reducing the occupation of the placement space of the battery module 3, thereby improving the energy density of the battery pack. In this embodiment, the top plate 201 and the bottom plate 202, as well as the abutting portion and the protruding portion in the cold plate 2 are arranged, which is convenient for forming the flow channel 200 in the cold plate 2, and has a better use effect.

[0057] As a preferred arrangement, Figure 3 As shown in , the first support body 501 is arranged between the protruding portion and the bottom wall of the lower shell 1, and the second support body 502 is arranged between the abutting portion and the bottom wall of the lower shell 1. Such an arrangement is conducive to increasing the height of the second support body 502, thereby improving the buffering effect of the second support body 502.

[0058] Of course, in specific implementation, the arrangement position of the silicone foam can still be adaptively adjusted according to the use requirements. In addition, the first support body 501 and the second support body 502 in this embodiment can be connected to the bottom wall of the cold plate 2 and / or the lower shell 1 by bonding, so as to facilitate the arrangement of the support structure 5 and prevent the first support body 501 and the second support body 502 from moving, thereby ensuring the use effect of the support structure 5.

[0059] like Figure 1As shown, the battery pack of this embodiment includes a battery module 3 arranged in the lower shell 1, and the battery module 3 is connected to the cold plate 2 by thermal conductive adhesive. The thermal conductive adhesive has good thermal conductivity and can transfer the temperature of the cold plate 2 to the battery module 3, playing a good temperature control function, ensuring the performance of the battery cell, and further reducing the risk of thermal runaway of the battery cell. In addition, the thermal conductive adhesive is also conducive to achieving the connection between the battery module 3 and the cold plate 2, and the disassembly and replacement of the battery module 3 is also conducive to reducing the risk of ball impact failure at the bottom of the lower shell 1.

[0060] like Figure 5 As shown in the figure, the edge of the cold plate 2 is connected to the lower shell 1 by penetration welding, and the lower shell 1 is provided with welds 102 corresponding to the edges of the cold plate 2. The penetration welding in this embodiment is the FSW welding process in the prior art. The edge of the cold plate 2 is connected to the lower shell 1 by penetration welding. This connection method has the advantages of high efficiency and low consumption, low welding temperature, small residual stress of the joint, small deformation of the welded workpiece, and environmental friendliness.

[0061] As a preferred embodiment, a beam body 101 is provided in the lower housing 1, and the beam body 101 divides the lower housing 1 into a plurality of installation spaces, and the battery module 3 is arranged in the installation space. The beam body 101 is connected to the cold plate 2 by flow drill screws 103, and a structural sealant is provided between the two. Figure 4 As shown in the figure, the beam body 101 is arranged in a plurality of horizontal and vertical staggered arrangements. The arrangement of the beam body 101 is not only conducive to forming an installation space for installing the battery module 3. The beam body 101 is connected to the cold plate 2 by flow drill screws 103, and the arrangement of the structural sealant between the two is conducive to improving the connection strength and sealing effect. Among them, the flow drill screws 103 are also known as the FDS connection process, which is mature and easy to implement.

[0062] In order to facilitate the installation of the battery module 3 in the corresponding installation space, the beam body 101 and / or the lower shell 1 are provided with a protrusion 104 protruding into the installation space. For example, when the installation space is only composed of the beam body 101, the protrusion 104 is arranged on the beam body 101. When the installation space is formed by the lower shell 1 and the beam body 101, the protrusion 104 is respectively arranged on the beam body 101 and the lower shell 1. The end plate 301 of the battery module 3 is connected to the protrusion 104 through a connector, and an epoxy gasket 402 is provided between the end plate 301 and the protrusion 104.

[0063] In this embodiment, the setting of the protrusion 104 is conducive to the installation of the end plate 301 of the battery module 3, and the epoxy gasket 402 is set between the end plate 301 and the protrusion 104 to prevent the battery module 3 from directly contacting the lower shell 1, which has a better heat insulation effect.

[0064] Combination Figure 1 , Figure 7 and Figure 8As shown in , a connection hole is provided on the protrusion 104, and an epoxy gasket 402 is arranged corresponding to the connection hole. A screw sleeve 403 is embedded in the connection hole, and the connecting member is a bolt 4 passing through the end plate 301, and the bolt 4 is screwed and connected with the screw sleeve 403. In specific implementation, the epoxy gasket 402 is attached to the corresponding connection hole by double-sided tape. The connection hole on the protrusion 104 and the arrangement of the screw sleeve 403 are conducive to improving the connection strength and firmness between the end plate 301 and the protrusion 104.

[0065] Further, such as Figure 7 and Figure 8 As shown in , the portion where the bolt 4 is screwed to the screw sleeve 403 is coated with a thread fastener 404. In this embodiment, the portion where the bolt 4 is screwed to the screw sleeve 403 is coated with a thread fastener 404, which helps prevent the bolt 4 from loosening due to torque attenuation, thereby helping to ensure that the bolt 4 has good connection reliability. This helps to increase the stability of the internal structure of the battery pack. A conical gasket 401 is sandwiched between the head of the bolt 4 and the end plate 301, and the tip of the conical gasket 401 is set upward. The conical gasket 401 is sandwiched between the head of the bolt 4 and the end plate 301, which is not only easy to arrange, but also can improve the connection effect of the bolt 4. In order to further improve the installation effect of the battery module 3, the battery module 3 is also screwed to each beam body 101.

[0066] The battery pack of this embodiment uses a first support body 501 made of EPP foam or polypropylene microporous foam material, and a second support body 502 made of silicone foam, which is conducive to reducing costs while also improving the support and buffering effects, effectively solving the problem of deformation of the cold plate 2, and the structure of the entire support structure 5 is simple and easy to arrange and implement. In addition, the hybrid connection method between the cold plate 2 and the lower shell 1 is also conducive to improving the installation reliability and safety of the battery module 3, thereby improving the performance of the battery pack.

[0067] In addition, the present embodiment also relates to an energy storage device, in which the above battery pack is provided.

[0068] The energy storage device of this embodiment is helpful to improve the performance and safety by providing the battery pack as described above.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: It comprises a lower shell, a cold plate arranged in the lower shell, and a supporting structure sandwiched between the cold plate and the bottom wall of the lower shell; The support structure includes a first support body and a second support body, the hardness of the first support body is greater than the hardness of the second support body, and the first support body has a through hole, and the second support body is arranged in the through hole.

2. The battery pack according to claim 1, characterized in that: The first support body is rectangular and is a plurality of support bodies spaced between the cold plate and the bottom wall of the lower shell; and / or, The through hole is a long strip hole, and the second support body is arranged in the shape of the through hole.

3. The battery pack according to claim 1, characterized in that: The first support body is made of EPP foam or polypropylene microporous foam material, and the second support body is made of silicone foam; and / or, The cold plate comprises a top plate and a bottom plate which are connected by buckling, the bottom plate has an abutting portion abutting against the top plate, and a protruding portion protruding in a direction away from the top plate, the protruding portion and the top plate surround a flow channel; The first support body is disposed between the protruding portion and the bottom wall of the lower shell, and the second support body is disposed between the abutting portion and the bottom wall of the lower shell.

4. The battery pack according to any one of claims 1 to 3, characterized in that: comprising a battery module disposed in the lower housing; The battery module is connected to the cold plate via heat conductive adhesive.

5. The battery pack according to claim 4, characterized in that: The edge of the cold plate is connected to the lower shell by penetration welding; and / or, A beam body is provided in the lower shell body, and the beam body divides the lower shell body into a plurality of installation spaces. The battery module is arranged in the installation space, and the beam body is connected to the cold plate by flow drill screws, and a structural sealant is provided therebetween.

6. The battery pack according to claim 5, characterized in that: The beam body and / or the lower shell body are provided with a convex block protruding into the installation space; The end plate of the battery module is connected to the convex block through a connecting piece, and an epoxy gasket is arranged between the end plate and the convex block.

7. The battery pack according to claim 6, characterized in that: The bump is provided with a connection hole, and the epoxy gasket is arranged corresponding to the connection hole; A threaded sleeve is embedded in the connecting hole, and the connecting piece is a bolt passing through the end plate, and the bolt is threadedly connected to the threaded sleeve.

8. The battery pack according to claim 7, characterized in that: The portion where the bolt and the threaded sleeve are threadedly connected is coated with thread fastening glue.

9. The battery pack according to claim 7, characterized in that: A conical gasket is sandwiched between the head of the bolt and the end plate.

10. An energy storage device, characterized in that: The energy storage device is provided with a battery pack according to any one of claims 1 to 9.

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