Battery pack and energy storage system
By setting separators in the battery pack to form liquid channels, the problem of low heat dissipation efficiency of cells in oil-immersed liquid-cooled battery packs is solved, achieving more efficient thermal management.
Patent Information
- Application Number
- CN202423320666.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In existing oil-immersed liquid-cooled battery packs, adjacent cells do not come into contact with cooling oil, resulting in low heat dissipation efficiency.
A first separator and a second separator are provided between adjacent cells to form a liquid channel that runs through the cell assembly, accommodating insulating coolant and increasing the contact area between the coolant and the cell.
It improves the heat dissipation efficiency of the battery cell assembly by enhancing heat absorption and transfer through the flow of insulating coolant.
Smart Images
Figure CN223927430U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of energy storage technology, and in particular to a battery pack and energy storage system. Background Technology
[0002] Oil-immersed liquid-cooled battery packs achieve efficient heat dissipation by completely immersing the battery cells in cooling oil, utilizing the oil's excellent thermal conductivity. However, current oil-immersed liquid-cooled battery packs consist of multiple cells arranged closely together, with the facing surfaces of adjacent cells not in contact with the cooling oil, resulting in relatively low heat dissipation efficiency. Utility Model Content
[0003] In view of the problems existing in the background art, the purpose of this application is to provide a battery pack and energy storage system that overcomes or at least partially solves the above problems.
[0004] According to a first aspect of this application, a battery pack is provided, including a housing and a cell assembly. The housing has a receiving cavity and includes a base plate. The base plate has a supporting plane and a cooling channel for coolant to flow through. The cell assembly is disposed within the receiving cavity, and the supporting plane supports the cell assembly. The cell assembly includes at least two cells arranged sequentially along a first direction parallel to the supporting plane. A first separator is provided between adjacent cells at their ends away from the base plate, and a second separator is provided between adjacent cells at their ends near the base plate. A first liquid channel is formed between the first separator and the second separator, and the first liquid channel penetrates the cell assembly.
[0005] In one or more of the above optional embodiments, the number of battery cell assemblies is at least two, and at least two battery cell assemblies are arranged sequentially at intervals along the second direction. A second liquid channel is formed between two adjacent battery cell assemblies. Along the first direction, the two ends of the second liquid channel are respectively connected to the receiving cavity. The second direction is perpendicular to the first direction and parallel to the support plane.
[0006] In one or more of the above alternative embodiments, along the second direction, the first liquid channels of adjacent cell assemblies are aligned one-to-one.
[0007] In one or more of the above optional embodiments, a first gasket and a second gasket are included. The first gasket and the second gasket are disposed on the support plane. Both the first gasket and the second gasket extend along the first direction and are spaced apart from each other along a second direction. In a direction perpendicular to the support plane, the thickness of the first gasket and the thickness of the second gasket are equal. The surfaces of the first gasket and the second gasket facing away from the support plane abut against the surface of each battery cell assembly facing the support plane. The gap between the battery cell assembly and the support plane is filled with thermally conductive adhesive, and the battery cell assembly is bonded and fixed to the support plane by the thermally conductive adhesive. The second direction is perpendicular to the first direction and parallel to the support plane.
[0008] In one or more of the above optional embodiments, the battery cell assembly includes two end plates disposed opposite to each other at both ends of the at least two battery cells along the first direction. Each end plate includes two flat plate portions disposed opposite to each other along the first direction and a connecting rib connecting the two flat plate portions. A hollow cavity is formed between the two flat plate portions and the hollow cavity communicates with the receiving cavity.
[0009] In one or more of the above optional embodiments, the flat plate portion away from the at least two battery cells is provided with a lifting hole, which communicates with the hollow cavity.
[0010] In one or more of the above alternative embodiments, the cell assembly includes strapping that surrounds and straps the two end plates and the at least two cells.
[0011] In one or more of the above optional embodiments, along the first direction, the base plate includes a first end and a second end disposed opposite to each other, and the cooling channel includes a liquid inlet channel, a liquid inlet chamber, a plurality of first channels, a first connecting chamber, a plurality of second channels, a second connecting chamber, a plurality of third channels, a third connecting chamber, a plurality of fourth channels, a liquid outlet chamber, and a liquid outlet channel. The first channels, the second channels, the third channels, and the fourth channels all extend along the first direction. The liquid inlet chamber, the first connecting chamber, the second connecting chamber, the third connecting chamber, and the liquid outlet chamber all extend along the second direction. The liquid inlet chamber, the second connecting chamber, and the liquid outlet chamber are located at the first end. The liquid inlet chamber, the second connecting chamber, and the liquid outlet chamber are arranged sequentially along the second direction. The first connecting chamber and the third connecting chamber are located at the second end. The first connecting chamber and the third connecting chamber are arranged sequentially along the second direction. Along the first direction, the inlet chamber is aligned with and communicates with one end of the plurality of first flow channels near the first end; the first connecting chamber is aligned with and communicates with one end of the plurality of first flow channels near the second end and one end of the plurality of second flow channels near the second end; the second connecting chamber is aligned with and communicates with one end of the plurality of second flow channels near the first end and one end of the plurality of third flow channels near the first end; the third connecting chamber is aligned with and communicates with one end of the plurality of third flow channels near the second end and one end of the plurality of fourth flow channels near the second end; and the outlet chamber is communicated with one end of the plurality of fourth flow channels near the first end. The second direction is perpendicular to the first direction and parallel to the supporting plane.
[0012] In one or more of the above optional embodiments, the first separator and the second separator are made of foam.
[0013] According to a second aspect of this application, an energy storage system is provided, including a battery pack as described above.
[0014] The beneficial effects of the embodiments of this application are as follows: The battery pack provided in the embodiments of this application, by setting a first separator and a second separator between two adjacent cells, forms a first liquid channel through the cell assembly between the two adjacent cells. The first liquid channel can accommodate insulating coolant, which is beneficial to increase the contact area between the insulating coolant and the cell, thereby improving the heat dissipation efficiency of the cell assembly. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0016] Figure 1 A schematic diagram of a battery pack provided in an embodiment of this application;
[0017] Figure 2 for Figure 1 Schematic diagram of the cross section at point AA;
[0018] Figure 3 for Figure 2 Enlarged view of point C in the middle;
[0019] Figure 4 This is a partial exploded view of a battery pack provided in an embodiment of this application;
[0020] Figure 5 This is a partial exploded view of a battery pack provided in an embodiment of this application;
[0021] Figure 6 A perspective view of an end plate of a battery pack provided in an embodiment of this application;
[0022] Figure 7 for Figure 1 A cross-sectional view of section BB. Detailed Implementation
[0023] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and similar expressions used in this specification are for illustrative purposes only.
[0024] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.
[0025] In the description of this specification, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0026] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.
[0027] Please see Figure 1-4 The battery pack 1000 includes a housing 1 and a cell assembly 2. The housing 1 has a receiving cavity a and includes a base plate 11. The base plate 11 has a supporting plane 111 and a cooling channel c for coolant flow. The cell assembly 2 is disposed within the receiving cavity a, and the supporting plane 111 supports the cell assembly 2. The cell assembly 2 includes at least two cells 21, which are arranged sequentially along a first direction X, parallel to the supporting plane 111. A first separator 3 is provided between adjacent cells 21 at the end furthest from the base plate 11. A second separator 4 is provided between adjacent cells 21 at the end closest to the base plate 11. A first liquid channel b is formed between the first separator 3 and the second separator 4, penetrating the cell assembly 2.
[0028] During use, the receiving cavity a stores insulating coolant, which includes, but is not limited to, insulating oil. The battery cell assembly 2 is immersed in the insulating coolant. The insulating coolant enters between two adjacent battery cells 21 through the first liquid channel b, which passes through the through-hole formed by the battery cell assembly 2 and communicates with the receiving cavity a. The insulating coolant absorbs the heat generated by the battery cell assembly 2 during operation and exchanges heat with the coolant flowing through the cooling channel via the base plate 11.
[0029] The battery pack 1000 provided in this application embodiment provides a first separator 3 and a second separator 4 between two adjacent cells 21, thereby forming a first liquid channel b that penetrates the cell assembly 2 between the two adjacent cells 21. The first liquid channel b can accommodate insulating coolant, which helps to increase the contact area between the insulating coolant and the cell 21, thereby improving the heat dissipation efficiency of the cell assembly 2.
[0030] In some embodiments, the first separator 3 and the second separator 4 are made of foam, which can absorb insulating coolant and improve the heat dissipation efficiency of the surfaces of the battery cell 21 in contact with the first separator 3 and the second separator 4.
[0031] In some embodiments, the first separator 3 and the second separator 4 are made of neoprene (CR) foam.
[0032] In some embodiments, the battery cell 21 is generally cubic in shape and includes a first surface and a second surface disposed opposite to each other along a first direction X, a third surface and a fourth surface disposed opposite to each other along a second direction Y, and a fifth surface and a sixth surface disposed opposite to each other along a direction Z perpendicular to the support plane 111. In this application, the second direction Y is perpendicular to the first direction X and parallel to the support plane 111.
[0033] In some embodiments, the first separator 3 and the second separator 4 are both flat sheet structures with the first direction X as the thickness direction. In two adjacent cells 21 and the first separator 3 and the second separator 4 corresponding to them, along the thickness direction of the first separator 3, the opposite side surfaces of the first separator 3 are respectively attached to the first surface of one cell 21 and the second surface of the other cell 21; along the thickness direction of the second separator 4, the opposite side surfaces of the second separator 4 are respectively attached to the first surface of one cell 21 and the second surface of the other cell 21; the opposing first and second surfaces, the surface of the first separator 3 facing the second separator 4, and the surface of the second separator 4 facing the first separator 3 together define the first liquid channel b.
[0034] In some embodiments, the first liquid channel b extends through the cell assembly 2 in a direction parallel to the second direction Y.
[0035] In some embodiments, the number of battery cell assemblies 2 is at least two, and at least two battery cell assemblies 2 are arranged sequentially at intervals along the second direction Y. A second liquid channel d is formed between two adjacent battery cell assemblies 2, and the two ends of the second liquid channel d are respectively connected to the receiving cavity a along the first direction X.
[0036] In some embodiments, along the second direction Y, the first liquid channels b of adjacent cell assemblies 2 are aligned one-to-one.
[0037] Please see Figure 1 and Figure 2In some embodiments, the housing 1 includes a front wall 12 and a rear wall 13 disposed opposite to each other along a first direction X, and a first side wall 14 and a second side wall 15 disposed opposite to each other along a second direction Y. A surrounding plate 16 is disposed on the side of the front wall 12 facing the rear wall 13. The surrounding plate 16 and the front wall 12 enclose a gas cavity e with an opening facing away from the support plane 111. The surrounding plate 16, the front wall 12, the rear wall 13, the first side wall 14, the second side wall 15 and the bottom plate 11 together define the receiving cavity a. Along the direction Z perpendicular to the support plane 111, the end of the surrounding plate 16 away from the bottom plate 11 has a preset height. When insulating coolant is injected into the receiving cavity a, the height of the insulating coolant is lower than the preset height of the end of the surrounding plate 16 away from the bottom plate 11, and the surrounding plate 16 prevents the insulating coolant from flowing into the gas cavity e. The battery pack 1000 also includes an electrical connector and an adapter. The adapter passes through the part of the front wall 12 and the enclosure plate 16 that forms the gas cavity e. One end of the electrical connector is connected to the cell assembly 2 in the receiving cavity a, and the other end passes over the enclosure plate 16 and is away from the bottom plate 11. It enters the gas cavity e through the opening of the gas cavity e and is connected to the end of the adapter located in the gas cavity e. The other end of the adapter is located outside the housing 1 for electrical connection with other devices.
[0038] In some embodiments, the front wall 12, which defines the receiving cavity a, is provided with an injection valve 121 and a drain valve 122. Along a direction Z perpendicular to the support plane 111, the injection valve 121 is located at the end of the front wall 12 away from the bottom plate 11, and the drain valve 122 is located at the end of the front wall 12 near the bottom plate 11. The injection valve 121 is used to inject insulating coolant into the receiving cavity a, and the drain valve 122 is used to drain the insulating coolant from the receiving cavity a.
[0039] Please see Figure 5 In some embodiments, the battery pack 1000 includes a first gasket 5 and a second gasket 6, which are disposed on a support plane 111. Both the first gasket 5 and the second gasket 6 extend along a first direction X, are spaced apart from each other along a second direction Y, and have the same thickness along a direction Z perpendicular to the support plane 111. The surfaces of the first gasket 5 and the second gasket 6 facing away from the support plane 111 abut against the surface of each battery cell assembly 2 facing the support plane 111. The gap between the battery cell assembly 2 and the support plane 111 is filled with thermally conductive adhesive, and the battery cell assembly 2 is bonded and fixed to the support plane 111 by the thermally conductive adhesive. The thermally conductive adhesive not only fixes the battery cell assembly 2 but also facilitates the transfer of heat from the bottom of the battery cell assembly 2 to the support plane 111 for heat exchange with the coolant flowing through the base plate 11.
[0040] During installation, the first pad 5 and the second pad 6 are first positioned and fixed at the preset position on the support plane 111. Then, the battery cell assembly 2 is placed on the first pad 5 and the second pad 6. Along the direction Z perpendicular to the support plane 111, the thickness of the first pad 5 and the thickness of the second pad 6 are equal. With the support of the first pad 5 and the second pad 6, the gap between the surface of the battery cell assembly 2 facing the support plane 111 and the support plane 111 has a uniform height in the direction Z perpendicular to the support plane 111, which is conducive to filling the gap between the battery cell assembly 2 and the support plane 111 with thermally conductive adhesive of uniform thickness.
[0041] In some embodiments, the sixth surfaces of at least two cells 21 constituting the cell assembly 2 are located in the same plane, and the sixth surface of each cell 21 is attached to the surface of the first pad 5 and the second pad 6 facing away from the support plane 111, and thermally conductive adhesive is filled between the sixth surface of each cell 21 and the support plane 111.
[0042] In some embodiments, the first gasket 5 and the second gasket 6 are, but are not limited to, made of polycarbonate.
[0043] Please see Figure 5 and Figure 6 In some embodiments, the cell assembly 2 includes two end plates 22 disposed opposite to each other at both ends of at least two cells 21 along a first direction X. Each end plate 22 includes two flat plate portions 221 disposed opposite to each other along the first direction X and a connecting rib 222 connecting the two flat plate portions 221. A hollow cavity f is formed between the two flat plate portions 221, and the hollow cavity f communicates with a receiving cavity a. After insulating coolant is injected into the receiving cavity a, the insulating coolant fills the hollow cavity f.
[0044] In some embodiments, a lifting hole 221a is provided on the flat plate portion 221 away from at least two battery cells 21, and the lifting hole 221a communicates with the hollow cavity f. The lifting hole 221a is used for lifting equipment to lift the battery cell assembly 2.
[0045] In some embodiments, the cell assembly 2 includes a strapping strap 23 that surrounds and straps two end plates 22 and at least two cells 21 that make up the cell assembly 2.
[0046] In some embodiments, a cell assembly 2 includes two straps 23, one strap 23 strapping two end plates 22 and at least two cells 21 away from the support plane 111, and the other strap 23 strapping two end plates 22 and at least two cells 21 near the support plane 111.
[0047] Please see Figure 5 and Figure 7In some embodiments, along the first direction X, the base plate 11 includes a first end 11a and a second end 11b disposed opposite to each other. The cooling channel includes an inlet channel c1, an inlet chamber c2, a plurality of first channels c3, a first connecting chamber c4, a plurality of second channels c5, a second connecting chamber c6, a plurality of third channels c7, a third connecting chamber c8, a plurality of fourth channels c9, an outlet chamber c10, and an outlet channel c11. The first channels c3, second channels c5, third channels c7, and fourth channels c9 are all along the first direction X. The inlet chamber c2, the first connecting chamber c4, the second connecting chamber c6, the third connecting chamber c8, and the outlet chamber c10 are all extended along the second direction Y. The inlet chamber c2, the second connecting chamber c6, and the outlet chamber c10 are located at the first end 11a and are arranged sequentially along the second direction Y. The first connecting chamber c4 and the third connecting chamber c8 are located at the second end 11b and are arranged sequentially along the second direction Y. Along the first direction X, the inlet chamber c2 is aligned and connected with the ends of multiple first flow channels c3 near the first end 11a; the first connecting chamber c4 is aligned and connected with the ends of multiple first flow channels c3 near the second end 11b and multiple second flow channels c5 near the second end 11b; the second connecting chamber c6 is aligned and connected with the ends of multiple second flow channels c5 near the first end 11a and multiple third flow channels c7 near the first end 11a; the third connecting chamber c8 is aligned and connected with the ends of multiple third flow channels c7 near the second end 11b and multiple fourth flow channels c9 near the second end 11b; and the outlet chamber c10 is connected with the ends of multiple fourth flow channels c9 near the first end 11a.
[0048] During use, the coolant flows sequentially through the inlet channel c1, inlet chamber c2, multiple first flow channels c3, first connecting chamber c4, multiple second flow channels c5, second connecting chamber c6, multiple third flow channels c7, third connecting chamber c8, multiple fourth flow channels c9, outlet chamber c10, and outlet channel c11 under the action of the pump.
[0049] Please see Figure 2 , Figure 5 and Figure 7In some embodiments, along the direction from the rear wall 13 to the front wall 12, the first end 11a of the bottom plate 11 at least partially protrudes from the front wall 12. The end of the liquid inlet channel c1 away from the liquid inlet chamber c2 is located at the portion of the first end 11a protruding from the front wall 12, and the end of the liquid outlet channel c11 away from the liquid outlet chamber c10 is located at the portion of the first end 11a protruding from the front wall 12. The battery pack 1000 includes a liquid inlet connector 7 and a liquid outlet connector 8, which are vertically arranged at the portion of the first end 11a protruding from the front wall 12. The liquid inlet connector 7 is connected to the end of the liquid inlet channel c1 away from the liquid inlet chamber c2, and the liquid outlet connector 8 is connected to the end of the liquid outlet channel c11 away from the liquid outlet chamber c10.
[0050] Based on the same inventive concept, this application also provides an energy storage system, including a battery pack 1000 as described in any of the above embodiments.
[0051] Based on the same inventive concept, this application also provides an energy storage device, including the energy storage system as described in any of the above embodiments, wherein the energy storage device includes, but is not limited to, an energy storage container.
[0052] The above are merely embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.
Claims
1. A battery pack, characterized in that, include: The housing has a receiving cavity. The housing includes a bottom plate with a supporting plane. A cooling channel is provided inside the bottom plate for coolant to flow through. A battery cell assembly is disposed within the receiving cavity. The supporting plane supports the battery cell assembly. The battery cell assembly includes at least two battery cells arranged sequentially along a first direction parallel to the supporting plane. A first separator is provided between two adjacent battery cells at the end away from the base plate, and a second separator is provided between two adjacent battery cells at the end near the base plate. A first liquid channel is formed between the first separator and the second separator, and the first liquid channel penetrates the battery cell assembly.
2. The battery pack according to claim 1, characterized in that, The number of battery cell assemblies is at least two, and the at least two battery cell assemblies are arranged sequentially at intervals along the second direction. A second liquid channel is formed between two adjacent battery cell assemblies. Along the first direction, the two ends of the second liquid channel are respectively connected to the receiving cavity. The second direction is perpendicular to the first direction and parallel to the support plane.
3. The battery pack according to claim 2, characterized in that, Along the second direction, the first liquid channels of adjacent cell assemblies are aligned one by one.
4. The battery pack according to claim 1, characterized in that, The device includes a first gasket and a second gasket, which are disposed on the support plane. Both the first and second gaskets extend along a first direction and are spaced apart from each other along a second direction. In a direction perpendicular to the support plane, the thickness of the first gasket and the thickness of the second gasket are equal. The surfaces of the first and second gaskets facing away from the support plane abut against the surface of each battery cell assembly facing the support plane. The gap between the battery cell assembly and the support plane is filled with thermally conductive adhesive, and the battery cell assembly is bonded and fixed to the support plane by the thermally conductive adhesive. Wherein, the second direction is perpendicular to the first direction and parallel to the support plane.
5. The battery pack according to claim 1, characterized in that, The battery cell assembly includes two end plates disposed opposite to each other at both ends of the at least two battery cells along the first direction. Each end plate includes two flat plate portions disposed opposite to each other along the first direction and a connecting rib connecting the two flat plate portions. A hollow cavity is formed between the two flat plate portions and the hollow cavity is in communication with the receiving cavity.
6. The battery pack according to claim 5, characterized in that, The flat plate portion, located away from the at least two battery cells, is provided with a lifting hole, which communicates with the hollow cavity.
7. The battery pack according to claim 5, characterized in that, The cell assembly includes strapping that wraps around and binds the two end plates and the at least two cells.
8. The battery pack according to claim 1, characterized in that, Along the first direction, the base plate includes a first end and a second end disposed opposite to each other. The cooling channel includes an inlet channel, an inlet chamber, a plurality of first channels, a first connecting chamber, a plurality of second channels, a second connecting chamber, a plurality of third channels, a third connecting chamber, a plurality of fourth channels, an outlet chamber, and an outlet channel. The first channels, second channels, third channels, and fourth channels all extend along the first direction. The inlet chamber, first connecting chamber, second connecting chamber, third connecting chamber, and outlet chamber all extend along the second direction. The inlet chamber, second connecting chamber, and outlet chamber are located at the first end. The inlet chamber, second connecting chamber, and outlet chamber are arranged sequentially along the second direction. The first connecting chamber and third connecting chamber are located at the second end. The first connecting chamber and third connecting chamber are arranged sequentially along the second direction. Along the first direction, the inlet chamber is aligned with and communicates with one end of the plurality of first flow channels near the first end; the first connecting chamber is aligned with and communicates with one end of the plurality of first flow channels near the second end and one end of the plurality of second flow channels near the second end; the second connecting chamber is aligned with and communicates with one end of the plurality of second flow channels near the first end and one end of the plurality of third flow channels near the first end; the third connecting chamber is aligned with and communicates with one end of the plurality of third flow channels near the second end and one end of the plurality of fourth flow channels near the second end; and the outlet chamber is communicated with one end of the plurality of fourth flow channels near the first end. Wherein, the second direction is perpendicular to the first direction and parallel to the support plane.
9. The battery pack according to any one of claims 1-8, characterized in that, The first separator and the second separator are made of foam.
10. An energy storage system, characterized in that, Includes the battery pack as described in any one of claims 1-9.