Battery pack and energy storage system

Abstract

The utility model relates to the technical field of energy storage, and discloses a battery pack and an energy storage system, and the battery pack comprises a shell, a surrounding plate, a battery cell assembly and an electrical connecting piece. The shell comprises a top wall, a bottom wall and a side wall, the top wall and the bottom wall are oppositely arranged, the side wall is connected between the top wall and the bottom wall, and the top wall, the bottom wall and the side wall jointly define a containing cavity. The coaming is arranged in the containing cavity, the coaming and the side wall define an isolation cavity, the coaming divides the containing cavity into a liquid storage cavity and an isolation cavity, a communication opening is formed between the end, away from the bottom wall, of the coaming and the top wall, and the liquid storage cavity communicates with the isolation cavity through the communication opening. The battery cell assembly is arranged in the liquid storage cavity, and the bottom wall bears the battery cell assembly. One end of the electrical connecting piece is electrically connected with the battery core assembly, and the other end of the electrical connecting piece enters the isolation cavity through the communication port and then penetrates through the side wall. In this way, the risk that the insulating cooling liquid seeps out of the shell through the gap in the connecting position of the electrical connecting piece and the shell is reduced.

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 submerging the battery cells in cooling oil, utilizing the oil's excellent thermal conductivity. Current oil-immersed liquid-cooled battery packs consist of a casing, battery cell assemblies, and electrical connectors. The battery cell assemblies are immersed in cooling oil within the casing, while the electrical connectors pass directly through the casing to electrically connect the battery cell assemblies to external devices. Sealing rings are used at the connection points between the electrical connectors and the casing to prevent cooling oil leakage. However, during prolonged use, aging of the sealing rings or deformation or damage due to external forces can cause cooling oil to seep out through gaps at the connections between the electrical connectors and the casing. 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, comprising: a housing, a surrounding plate, a cell assembly, and an electrical connector. The housing includes a top wall and a bottom wall disposed opposite each other, and a side wall connected between the top wall and the bottom wall, the top wall, the bottom wall, and the side wall together forming a receiving cavity. The surrounding plate is disposed within the receiving cavity, and the surrounding plate and the side wall together form an isolation cavity, the surrounding plate separating the receiving cavity into a liquid storage cavity and the isolation cavity. A communication opening is formed between the end of the surrounding plate away from the bottom wall and the top wall, the communication opening communicating between the liquid storage cavity and the isolation cavity. The cell assembly is disposed in the liquid storage cavity, and the bottom wall supports the cell assembly. One end of the electrical connector is electrically connected to the cell assembly, and the other end of the electrical connector enters the isolation cavity through the communication opening and then passes through the side wall.

[0005] In one or more of the above optional embodiments, the sidewall includes a front wall, and the enclosure includes a vertical plate, a first side plate, a second side plate, and a bottom plate. Along a first direction, the vertical plate is disposed opposite to the front wall. Along a second direction, the first side plate and the second side plate are respectively disposed on both sides of the vertical plate. One end of the vertical plate is connected to the first end of the first side plate, and the second end of the first side plate is connected to the front wall. The other end of the vertical plate is connected to the first end of the second side plate, and the second end of the second side plate is connected to the front wall. The bottom plate is connected to the front wall. The bottom ends of the vertical plate, the first side plate, and the second side plate away from the top wall are all connected to the bottom plate. The vertical plate, the first side plate, the second side plate, the bottom plate, and the front wall together enclose the isolation cavity. The first direction is perpendicular to the direction from the top wall to the bottom wall, and the second direction is perpendicular to the first direction.

[0006] In one or more of the above optional embodiments, the end of the base plate connected to the front wall is inclined toward the bottom wall relative to the end of the base plate connected to the vertical plate.

[0007] In one or more of the above optional embodiments, the second end of the first side plate is inclined relative to the first end of the first side plate toward the second side plate in the direction toward the first side plate; and / or the second end of the second side plate is inclined relative to the first end of the second side plate toward the first side plate in the direction toward the second side plate.

[0008] In one or more of the above optional embodiments, a support arm is included, disposed between the front wall and the vertical plate, with one end of the support arm connected to the front wall and the other end of the support arm connected to the vertical plate.

[0009] In one or more of the above optional implementations,

[0010] The electrical connector includes a connecting conductor and a connector. The connector passes through the part of the side wall and the enclosure plate that forms the isolation cavity. The first end of the connector is located outside the housing, and the second end of the connector is located inside the isolation cavity. One end of the connecting conductor is connected to the cell assembly, and the other end of the connecting conductor is connected to the second end of the connector.

[0011] In one or more of the above optional embodiments, the portion of the sidewall and the enclosure plate that forms the isolation cavity is provided with a mounting hole, and the connector is installed in the mounting hole. A sealing ring is provided between the mounting hole and the connector, and / or, sealant is provided between the mounting hole and the connector.

[0012] In one or more of the above optional embodiments, an explosion-proof valve is included, which passes through the side wall and the enclosure plate to form the isolation cavity.

[0013] In one or more of the above optional embodiments, a liquid injection valve is provided at one end of the side wall near the top wall, the first end of the liquid injection valve is connected to the liquid storage cavity, and the second end of the liquid injection valve is located outside the housing; and / or a liquid discharge valve is provided at one end of the side wall near the bottom wall, the first end of the liquid discharge valve is connected to the liquid storage cavity, and the second end of the liquid discharge valve is located outside the housing.

[0014] According to a second aspect of this application, an energy storage system is provided, including a battery pack as described above.

[0015] The beneficial effects of the embodiments of this application are: the battery pack provided in the embodiments of this application forms an isolation cavity by setting a surrounding plate and a side wall to enclose it. The electrical connector enters the isolation cavity through the communication port and passes through the side wall. The surrounding plate blocks the insulating coolant in the cavity from the outside of the isolation cavity, which helps to reduce the risk of the insulating coolant seeping out of the shell through the gap at the connection between the electrical connector and the shell. Attached Figure Description

[0016] 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.

[0017] Figure 1 A perspective view of a battery pack provided in an embodiment of this application;

[0018] Figure 2 A cross-sectional schematic diagram of a battery pack provided in an embodiment of this application;

[0019] Figure 3 for Figure 2 A magnified view of a portion of the image;

[0020] Figure 4 This is a partial exploded view of a battery pack provided in an embodiment of this application;

[0021] Figure 5 This is a schematic diagram of a battery pack enclosure provided in an embodiment of this application. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Please see Figure 1-3 The battery pack 1000 includes a housing 1, a surrounding plate 2, a cell assembly 3, and an electrical connector. The housing 1 includes a top wall 11 and a bottom wall 12 disposed opposite each other, and a side wall 13 connecting the top wall 11 and the bottom wall 12. The top wall 11, bottom wall 12, and side wall 13 together enclose a receiving cavity A. The surrounding plate 2 is disposed within the receiving cavity A, and the surrounding plate 2 and the side wall 13 enclose an isolation cavity A1. The surrounding plate 2 divides the receiving cavity A into a liquid storage cavity A2 and an isolation cavity A1. A communication port a is formed between the end of the surrounding plate 2 away from the bottom wall 12 and the top wall 11, connecting the liquid storage cavity A2 and the isolation cavity A1. The cell assembly 3 is disposed in the liquid storage cavity A2, and the bottom wall 12 supports the cell assembly 3. One end of the electrical connector is electrically connected to the cell assembly 3, and the other end of the electrical connector enters the isolation cavity A1 through the communication port a and then passes through the side wall 13.

[0027] During use, the liquid storage chamber A2 contains insulating coolant, which includes, but is not limited to, insulating oil, and the battery cell assembly 3 is immersed in the insulating coolant.

[0028] The battery pack 1000 provided in this application embodiment forms an isolation cavity A1 by setting a surrounding plate 2 and a side wall 13. The electrical connector enters the isolation cavity A1 through the communication port a and then passes through the side wall 13. The surrounding plate 2 blocks the insulating coolant in the cavity A from the outside of the isolation cavity A1, which helps to reduce the risk of the insulating coolant seeping out of the shell 1 through the gap at the connection between the electrical connector and the shell 1.

[0029] In some embodiments, along the direction X from the top wall 11 to the bottom wall 12, the lowest height H1 of the connection port a is higher than the maximum height H2 of the cell assembly 3. The lower height H1 of the connection port a is higher than the maximum height H2 of the cell assembly 3, so that after the insulating coolant is injected into the liquid storage chamber A2, the liquid level of the insulating coolant can submerge the cell assembly 3 and be lower than the lower height H1 of the connection port a.

[0030] Please see Figure 2-5 In some embodiments, the sidewall 13 includes a front wall 131, and the enclosure 2 includes a vertical plate 21, a first side plate 22, a second side plate 23, and a bottom plate 24. Along the first direction Y, the vertical plate 21 is disposed opposite to the front wall 131. Along the second direction Z, the first side plate 22 and the second side plate 23 are respectively disposed on both sides of the vertical plate 21. One end 211 of the vertical plate 21 is connected to the first end 221 of the first side plate 22, and the second end 222 of the first side plate 22 is connected to the front wall 131. The other end 212 of the vertical plate 21 is connected to the first end 231 of the second side plate 23, and the second end 232 of the second side plate 23 is connected to the front wall 131. The base plate 24 is connected to the front wall 131. The bottom ends 213 of the vertical plate 21 away from the top wall 11, the bottom ends 22 and 233 of the first side plate 23 away from the top wall 11 are all connected to the base plate 24. The vertical plate 21, the first side plate 22, the second side plate 23, the base plate 24, and the front wall 131 together form an isolation cavity A1. The first direction Y is perpendicular to the direction X from the top wall 11 to the bottom wall 12, and the second direction Z is perpendicular to the first direction Y.

[0031] In some embodiments, along the direction X from the top wall 11 to the bottom wall 12, the gap between the vertical plate 21 near the top end 214 of the top wall 11, the first side plate 22 near the top end 224 of the top wall 11, and the second side plate 23 near the top end 234 of the top wall 11 and the top wall 11 serves as a communication port a.

[0032] In some embodiments, the enclosure 2 is formed by bending and welding metal plates, the bottom plate 24 is welded to the front wall 131, the second end of the first side plate 22 is welded to the front wall 131, and the second end of the second side plate 23 is welded to the front wall 131.

[0033] In some embodiments, the end 241 of the base plate 24 connected to the front wall 131 is inclined toward the bottom wall 12 relative to the end 242 of the base plate 24 connected to the vertical plate 21. The inclined arrangement of the base plate 24 facilitates the upward accumulation of air bubbles in the insulating coolant, making it easier for gas to separate and dissipate from the insulating coolant on the side of the base plate 24 facing the bottom wall 12. On the other hand, during production, the welding equipment welds the connection between the base plate 24 and the front wall 131 on the side of the liquid storage chamber A2. The inclined arrangement of the base plate 24 increases the space on the side of the connection between the base plate 24 and the front wall 131 facing the liquid storage chamber A2, thereby providing more working space for the welding equipment used in the welding operation and improving the reliability of the welding of the base plate 24.

[0034] In some embodiments, the second end 222 of the first side plate 22 is inclined relative to the first end 221 of the first side plate 22 towards the second side plate 23 and towards the first side plate 22. During production, the welding equipment welds the connection between the second end 222 of the first side plate 22 and the front wall 131 on the side of the liquid storage chamber A2. The inclined arrangement of the first side plate 22 helps to increase the space facing the liquid storage chamber A2 at the connection between the second end of the first side plate 22 and the front wall 131, thereby providing more working space for the welding equipment used in the welding operation and improving the reliability of the welding of the first side plate 22.

[0035] In some embodiments, the second end 232 of the second side plate 23 is inclined relative to the first end 231 of the second side plate 23 towards the first side plate 22 and then towards the second side plate 23. During production, the welding equipment welds the connection between the second end 232 of the second side plate 23 and the front wall 131 on the side of the liquid storage chamber A2. The inclined arrangement of the second side plate 23 helps to increase the space facing the liquid storage chamber A2 at the connection between the second end of the second side plate 23 and the front wall 131, thereby providing more working space for the welding equipment used in the welding operation and improving the reliability of the welding of the second side plate 23.

[0036] Please see Figure 4 In some embodiments, the battery pack 1000 includes a support arm 5 disposed between the front wall 131 and the vertical plate 21, with one end of the support arm 5 connected to the front wall 131 and the other end of the support arm 5 connected to the vertical plate 21.

[0037] In some embodiments, the two ends of the support arm 5 are welded to the front wall 131 and the vertical plate 21, respectively.

[0038] Please see Figure 1 and Figure 2In some embodiments, the sidewall 13 includes a rear wall 132 disposed opposite to the front wall 131 along the first direction Y, and a first sidewall (not shown) and a second sidewall (not shown) disposed opposite to each other along the second direction Z. The front wall 131, the rear wall 132, the first sidewall, the second sidewall and the bottom wall 12 together enclose a cavity with an opening facing the top wall 11. Along the direction from the top wall 11 to the bottom wall 12, the top wall 11 covers the opening of the cavity to close the opening.

[0039] In some embodiments, the battery cell assembly 3 includes a plurality of battery cells, which are arranged sequentially along the first direction Y, and the plurality of battery cells 31 are connected in series.

[0040] In some implementations, the number of battery cell assemblies 3 is at least two, the at least two battery cell assemblies 3 are arranged along the second direction Z, and the at least two battery cell assemblies 3 are connected in series.

[0041] Please see Figure 1 and Figure 4 In some embodiments, the electrical connector includes a connecting conductor (not shown) and a connector. The connector passes through the portion of the side wall 13 that is enclosed by the enclosure plate 2 to form an isolation cavity A1. The first end of the connector is located outside the housing 1, and the second end of the connector is located inside the isolation cavity A1. One end of the connecting conductor is connected to the cell assembly 3, and the other end of the connecting conductor is connected to the second end of the connector.

[0042] In some embodiments, the connecting conductors include a first connecting copper busbar and a second connecting copper busbar, and the connectors include a first adapter 421 and a second adapter 422. Both the first adapter 421 and the second adapter 422 pass through the portion of the isolation cavity A1 formed by the side wall 13 and the surrounding plate 2. One end of the first connecting copper busbar is connected to the positive terminal of the battery cell assembly 3, and the other end of the first connecting copper busbar is connected to the end of the first adapter 421 located within the isolation cavity A1. The other end of the first adapter 421 located outside the housing 1 is used for electrical connection with other devices. One end of the second connecting copper busbar is connected to the negative terminal of the battery cell assembly 3, and the other end of the second connecting copper busbar is connected to the end of the second adapter 422 located within the isolation cavity A1. The other end of the second adapter 422 located outside the housing 1 is used for electrical connection with other devices.

[0043] In some embodiments, the connecting conductor includes a transmission cable and a third adapter 423. The third adapter 423 passes through the part of the side wall 13 and the enclosure 2 that form the isolation cavity A1. One end of the transmission cable is connected to the cell assembly 3, and the other end of the transmission cable is connected to the end of the third adapter 423 located inside the isolation cavity A1. The end of the third adapter 423 located outside the housing 1 is used to connect to the battery management unit.

[0044] In some embodiments, the portion of the isolation cavity A1 formed by the side wall 13 and the surrounding plate 2 is provided with a mounting hole 13a, and the connector is installed in the mounting hole 13a.

[0045] In some embodiments, a sealing ring (not shown) is provided between the mounting hole 13a and the connector.

[0046] In some embodiments, a sealant (not shown) is provided between the mounting hole 13a and the connector.

[0047] In some embodiments, the battery pack 1000 includes an explosion-proof valve 6, which passes through the portion of the side wall 13 and the surrounding plate 2 that forms an isolation cavity A1. The explosion-proof valve 6 is used to open in the event of an overpressure condition in the cavity A to release excess pressure within the cavity A.

[0048] Please see Figure 3 and Figure 4 In some embodiments, a liquid injection valve 7 is provided at one end of the side wall 13 near the top wall 11. One end of the liquid injection valve 7 is connected to the liquid storage chamber A2, and the other end of the liquid injection valve 7 is located outside the housing 1. The second end of the liquid injection valve 7 is used to connect to a liquid injection device to inject insulating coolant into the liquid storage chamber A2 through the liquid injection device.

[0049] In some embodiments, a drain valve 8 is provided at one end of the side wall 13 near the bottom wall 12. One end of the drain valve 8 is connected to the liquid storage chamber A2, and the other end of the drain valve 8 is located outside the housing 1. The drain valve 8 is used to drain the insulating coolant in the liquid storage chamber A2 after being opened.

[0050] In some embodiments, a cooling channel is provided in the bottom wall for circulating coolant during battery pack use to exchange heat with the cell assembly 3 and the insulating coolant within the housing cavity.

[0051] 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.

[0052] 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.

[0053] 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 by, The battery pack comprises: a shell comprising a top wall and a bottom wall arranged oppositely, and a side wall connected between the top wall and the bottom wall, the top wall, the bottom wall and the side wall collectively enclosing a containing cavity; a baffle arranged in the containing cavity, the baffle and the side wall enclosing an isolated cavity, the baffle separating the containing cavity into a liquid storage cavity and the isolated cavity, and a communication port being formed between an end of the baffle away from the bottom wall and the top wall, the communication port communicating the liquid storage cavity and the isolated cavity; an electric core assembly arranged in the liquid storage cavity, the bottom wall bearing the electric core assembly; an electrical connector, one end of the electrical connector being electrically connected with the electric core assembly, and the other end of the electrical connector entering the isolated cavity through the communication port and being arranged in the side wall.

2. The battery pack according to claim 1, wherein the side wall comprises a front wall, the baffle comprises a vertical plate, a first side plate, a second side plate and a bottom plate, along a first direction, the vertical plate is arranged opposite to the front wall; along a second direction, the first side plate and the second side plate are arranged on two sides of the vertical plate respectively, one end of the vertical plate is connected with a first end of the first side plate, a second end of the first side plate is connected with the front wall, the other end of the vertical plate is connected with a first end of the second side plate, and a second end of the second side plate is connected with the front wall; the bottom plate is connected with the front wall, a bottom end of the vertical plate away from the top wall, a bottom end of the first side plate away from the top wall and a bottom end of the second side plate away from the top wall are all connected with the bottom plate, and the vertical plate, the first side plate, the second side plate, the bottom plate and the front wall collectively enclose the isolated cavity; wherein the first direction is perpendicular to a direction from the top wall to the bottom wall, and the second direction is perpendicular to the first direction.

3. The battery pack according to claim 2, wherein an end of the bottom plate connected with the front wall is arranged obliquely towards the bottom wall relative to an end of the bottom plate connected with the vertical plate.

4. The battery pack according to claim 2, wherein a second end of the first side plate is arranged obliquely towards the second side plate relative to a first end of the first side plate; and / or a second end of the second side plate is arranged obliquely towards the first side plate relative to a first end of the second side plate.

5. The battery pack according to any one of claims 2-4, comprising a support arm arranged between the front wall and the vertical plate, one end of the support arm being connected with the front wall, and the other end of the support arm being connected with the vertical plate.

6. The battery pack according to claim 1, wherein the electrical connector comprises a connecting conductor and a connector, the connector being arranged in a portion of the side wall and the baffle enclosing the isolated cavity, a first end of the connector being located outside the shell, a second end of the connector being located inside the isolated cavity, one end of the connecting conductor being connected with the electric core assembly, and the other end of the connecting conductor being connected with the second end of the connector. ​ 7. The battery pack of claim 6, wherein, a portion of the side wall and the baffle wall enclosing the isolation cavity is provided with a mounting hole, and the joint is mounted in the mounting hole; a sealing ring is arranged between the mounting hole and the joint, and / or a sealing glue is arranged between the mounting hole and the joint.

8. The battery pack of claim 1, wherein, an explosion-proof valve is arranged in a portion of the side wall and the baffle wall enclosing the isolation cavity.

9. The battery pack of claim 1, wherein, a liquid injection valve is arranged at an end of the side wall close to the top wall, a first end of the liquid injection valve is in communication with the liquid storage cavity, and a second end of the liquid injection valve is located outside the shell; and / or a liquid discharge valve is arranged at an end of the side wall close to the bottom wall, a first end of the liquid discharge valve is in communication with the liquid storage cavity, and a second end of the liquid discharge valve is located outside the shell.

10. An energy storage system characterized by, a battery pack as claimed in any one of claims 1-9.

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