Battery pack and energy storage device

Abstract

The invention discloses a battery pack and energy storage equipment. The battery pack comprises a first shell, a second shell, a battery cell assembly, an adapter plate assembly, a connecting piece and a sealing piece, the second shell is contained in the first shell, and the second shell is provided with an opening. And the battery core assembly is accommodated in the second shell. The adapter plate assembly penetrates through the opening, one part of the adapter plate assembly is located in the second shell and connected to the battery core assembly, and the other part of the adapter plate assembly is located between the second shell and the first shell. The connecting piece is connected to the part, located between the second shell and the first shell, of the adapter plate assembly. The sealing member is filled in the opening.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to a battery pack and an energy storage device. Background Technology

[0002] Rechargeable battery cells are those that can be recharged after being discharged, allowing the active materials to be reactivated and reused. Rechargeable battery cells are widely used in electronic devices such as mobile phones, laptops, and drones.

[0003] Battery packs typically consist of multiple cells to meet the voltage requirements of electronic devices. Improving the sealing performance of battery packs has been a key research focus in the development of battery technology. Summary of the Invention

[0004] This application provides a battery pack and an energy storage device that improves the sealing performance of the battery pack.

[0005] In a first aspect, this application provides a battery pack comprising a first housing, a second housing, a cell assembly, an adapter plate assembly, a connector, and a seal. The second housing is housed within the first housing and has an opening. The cell assembly is housed within the second housing. The adapter plate assembly passes through the opening, with a portion of the adapter plate assembly located inside the second housing and connected to the cell assembly, and another portion of the adapter plate assembly located between the second housing and the first housing. The connector is connected to the portion of the adapter plate assembly located between the second housing and the first housing. The seal fills the opening. The seal fills at least a portion of the gap between the adapter plate assembly and the second housing, which, on the one hand, facilitates fixing the adapter plate assembly and reduces its shaking; on the other hand, facilitates the formation of a seal between the adapter plate assembly and the second housing, improving the sealing effect between them, preventing high-temperature substances generated by thermal runaway of the cell from being ejected from the opening, reducing the risk of short circuits caused by damage to the connector by high-temperature substances, and thus improving the reliability and safety of the battery pack.

[0006] In any one or more of the above optional embodiments, the connector is used to electrically connect the adapter plate assembly and electrical components outside the second housing. Optionally, the battery pack includes a connector disposed in the first housing for connection to an external device. The connector is connected to the connector.

[0007] In any one or more of the above alternative embodiments, the connector includes a wire harness.

[0008] In any one or more of the above alternative embodiments, the seal includes foam.

[0009] In any one or more of the above optional embodiments, the seal surrounds the outer side of the adapter plate assembly along its thickness direction. The seal surrounding the adapter plate assembly helps to fill the gaps between the various areas of the outer periphery of the adapter plate assembly and the second housing, improving the sealing effect between the adapter plate assembly and the second housing.

[0010] In any one or more of the above alternative embodiments, at least a portion of the seal is clamped between the adapter plate assembly and the second housing. The seal is compressed during assembly, which reduces damage to the seal and also reduces the gap between the seal and the circuit board.

[0011] In any one or more of the above alternative embodiments, the adapter plate assembly includes a circuit board that passes through an opening. The seal is a flexible structural member, and the surface of the circuit board is provided with electronic components located between the seal and the circuit board.

[0012] In any one or more of the above alternative embodiments, the adapter plate assembly includes a circuit board that passes through an opening and has a recess in which a portion of the seal is received. This helps to limit the position of the seal and facilitates assembly.

[0013] In any one or more of the above alternative embodiments, the circuit board includes a printed circuit board, and a seal surrounds the outside of the printed circuit board, which facilitates pressing the seal through the circuit board and the second housing.

[0014] In any one or more of the above optional embodiments, the portion of the seal that is received in the groove is bonded to the circuit board. This helps reduce the risk of the seal shifting during assembly, causing misalignment or even preventing it from being installed in the opening, thereby improving the sealing effect.

[0015] In any one or more of the above optional embodiments, the battery pack includes an adhesive member, at least a portion of which is disposed on the outer side of the seal member away from the cell assembly. The adhesive member bonds the seal member and the adapter plate assembly. Bonding the seal member and the adapter plate assembly with the adhesive member improves the connection stability and sealing effect of the seal member and the adapter plate assembly.

[0016] In any one or more of the above optional embodiments, the second housing has a recess on the side facing the first housing, with an opening penetrating the bottom wall of the recess, and at least a portion of the adhesive is accommodated in the recess. The recess provides a first space for accommodating the adhesive, facilitating the placement of flowable adhesive or potting compound within the recess, thereby forming the adhesive after the adhesive or potting compound cures, bonding the sealant and the adapter plate assembly, and bonding the sealant and the second housing. The recess also facilitates the deposition of a certain thickness of the adhesive within the recess, improving the sealing effect.

[0017] In any one or more of the above optional embodiments, the adhesive includes a potting compound. The potting compound has fluidity, which facilitates filling the gaps between the seal and the adapter plate assembly, as well as between the seal and the bottom wall, thereby improving the sealing effect.

[0018] In any one or more of the above optional embodiments, the battery pack includes a first pressure relief section disposed on a second housing; the second housing includes multiple housing walls, with the first pressure relief section and the opening respectively disposed on different housing walls. The high-temperature material ejected from the first pressure relief section is less likely to directly affect the connectors and adapter plate assemblies, which helps to reduce adverse effects on the connectors and adapter plate assemblies and improves the safety of the battery pack.

[0019] In any one or more of the above optional embodiments, the first housing includes a first bottom wall and a first peripheral wall, and the second housing has multiple shell walls including a second bottom wall and a second peripheral wall. The first bottom wall and the second bottom wall are disposed opposite to each other, the first peripheral wall surrounds the outside of the second peripheral wall, and the second peripheral wall surrounds the outside of the cell assembly. A first pressure relief portion is disposed on the second bottom wall, and an opening is disposed on the second peripheral wall. At least a portion of the connector is located between the first peripheral wall and the second peripheral wall. Substances released from the first pressure relief portion are discharged through the second bottom wall into the space between the first bottom wall and the second bottom wall, and then discharged through the second housing. This helps to reduce the temperature at the top of the first housing and reduce the impact on the top of the first housing. The fact that at least a portion of the connector is located between the first peripheral wall and the second peripheral wall helps to reduce the adverse effects of substances released from the first pressure relief portion on the connector and improves connection reliability.

[0020] In any one or more of the above optional embodiments, the first pressure relief part includes a pressure relief port and a first cover. The pressure relief port penetrates the shell wall of the second housing, and the first cover is disposed on the outer side of the second housing and covers the pressure relief port.

[0021] In any one or more of the above optional embodiments, the first pressure relief part includes an explosion-proof plate or a pressure relief valve.

[0022] In any one or more of the above optional embodiments, the second housing includes a first housing portion and a second housing portion disposed along a first direction, the first housing portion and the second housing portion being connected to form a receiving space, and the battery cell assembly being located within the receiving space. The opening includes a communicating first portion and a second portion, the first portion penetrating the first housing portion and the second portion penetrating the second housing portion. This facilitates reducing the depth of the first housing portion and the second housing portion along the first direction X, reducing the assembly difficulty of the battery cell assembly and the adapter plate assembly with the second housing, and reducing the assembly difficulty of the seal.

[0023] In any one or more of the above optional embodiments, the adapter board assembly includes a circuit board and electrical components disposed on the circuit board, the electrical components being located within a second housing. The battery cell assembly includes a plurality of battery cells. Along the thickness direction of the circuit board, the circuit board includes a first surface and a second surface disposed opposite to each other, the first surface facing the main body of the battery cell. Along the thickness direction of the circuit board, the length of the seal protruding from the second surface is L1, and the length of the electrical component protruding from the second surface is L2, where L1 > L2. The greater length of the seal protruding from the circuit board helps to reduce the impact between the electrical component and other components, reducing the risk of damage to the electrical component.

[0024] Secondly, this application provides an energy storage device that includes a battery pack according to any embodiment of the first aspect. Attached Figure Description

[0025] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0026] Figure 1 This is a schematic diagram of the battery pack structure provided in some embodiments of this application; Figure 2 for Figure 1 Exploded view of the battery pack shown; Figure 3 for Figure 1 The diagram shows the battery pack with the first housing removed. Figure 4 for Figure 1 A partial structural diagram of the battery pack shown. Figure 5 for Figure 4 Enlarged schematic diagram of region A in the middle; Figure 6 for Figure 1 The diagram shows a partial structure of the battery pack with the adhesive components removed. Figure 7 for Figure 4 An exploded view of a portion of the battery pack structure shown. Figure 8 for Figure 4 A cross-sectional view of a portion of the battery pack shown. Figure 9 for Figure 8 Enlarged schematic diagram of region B in the middle; Figure 10 for Figure 1 A schematic diagram of the structure of the first housing portion of the battery pack shown; Figure 11 for Figure 10 Enlarged schematic diagram of region C in the middle; Figure 12 for Figure 1A schematic diagram of the structure of the second housing portion of the battery pack shown; Figure 13 for Figure 12 Enlarged schematic diagram of region D in the middle; Figure 14 The diagram shows the structure of an energy storage device provided in some embodiments of this application.

[0027] The reference numerals in the accompanying drawings for the specific embodiments are as follows: 1. Battery pack; 10. First shell; 11. First bottom wall; 12. First peripheral wall; 121. First side wall; 13. First top wall; 20. Second housing; 20a. First housing portion; 20b. Second housing portion; 21. Opening; 21a. First part; 21b. Second part; 22. Recess; 221. Bottom wall; 22a. First sub-recess; 22b. Second sub-recess; 23. Second bottom wall; 24. Second peripheral wall; 241. Second side wall; 25. Second top wall; 26. Peripheral wall of first housing portion; 261. First sub-side wall; 27. Peripheral wall of second housing portion; 271. Second sub-side wall; 30. Battery cell assembly; 31. Battery cell; 311. Electrode terminal; 312. Main body. 40. Adapter board assembly; 41. Circuit board; 411. Groove; 41a. First surface; 41b. Second surface; 41c. First side surface; 41d. Second side surface; 41e. Third side surface; 42. Conductive sheet. 50. Connector; 60. Seal; 70. Adhesive; 80. Pressure relief port; 91. Exhaust unit; 92. Partition. X, first direction; Y, second direction; Z, third direction; 2. Energy storage equipment. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0029] The terms "first," "second," "third," etc., used in the specification, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0030] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0031] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-10°, the two directions can be considered parallel.

[0033] The battery pack of this application is described below with reference to the accompanying drawings.

[0034] Reference Figure 1 and Figure 2 This application provides a battery pack 1, which includes a first housing 10 and a second housing 20, with the second housing 20 housed within the first housing 10. The first housing 10 is an outer shell, and the second housing 20 is an inner shell.

[0035] In one example, the first housing 10 is a metal housing, and the material of the first housing 10 includes, but is not limited to, aluminum or aluminum alloy.

[0036] In one example, the second housing 20 is a metal housing, and the material of the second housing 20 includes, but is not limited to, aluminum or aluminum alloy.

[0037] Reference Figures 7 to 9 The battery pack 1 includes a cell assembly 30, which is housed within a second housing 20. The second housing 20 surrounds the cell assembly 30, which helps to protect the cell assembly 30 and constrain its expansion.

[0038] The battery cell assembly 30 includes multiple battery cells 31. The multiple battery cells 31 can be connected in series, in parallel, or in a mixed configuration (a mixed configuration means that both series and parallel connections are present). The multiple battery cells 31 can be stacked.

[0039] In one example, cell 31 is a pouch cell.

[0040] In one example, refer to Figure 1 , Figure 2 and Figure 4 The first housing 10 includes a first bottom wall 11 and a first peripheral wall 12. The second housing 20 has multiple housing walls including a second bottom wall 23 and a second peripheral wall 24. The first bottom wall 11 and the second bottom wall 23 are disposed opposite to each other. The first peripheral wall 12 surrounds the outside of the second peripheral wall 24, and the second peripheral wall 24 surrounds the outside of the cell assembly 30.

[0041] The first housing 10 includes a first top wall 13 connected to a first peripheral wall 12, and a second housing 20 located between the first top wall 13 and a first bottom wall 11. The first top wall 13 and the first bottom wall 11 are spaced apart along a first direction X.

[0042] The second housing 20 includes a second top wall 25 connected to a second peripheral wall 24, and the battery cell assembly 30 is located between the second top wall 25 and the second bottom wall 23. The first top wall 13 and the second top wall 25 are disposed opposite to each other. The second top wall 25 and the second bottom wall 23 are spaced apart along a first direction X.

[0043] Optionally, the first peripheral wall 12 includes a plurality of first sidewalls 121, which are connected to form an annular first peripheral wall 12. Exemplarily, the first housing 10 is generally rectangular and includes four first sidewalls 121.

[0044] Optionally, at least a portion of the first sidewall 121, the first bottom wall 11, and the first top wall 13 are integrally formed. For example, the first top wall 13 is integrally formed with at least a portion of the first sidewall 121, and the first bottom wall 11 is locked to the first sidewall 121 by fasteners.

[0045] Optionally, the second peripheral wall 24 includes a plurality of second sidewalls 241, which are connected to form an annular second peripheral wall 24. Exemplarily, the second housing 20 is generally rectangular and includes four second sidewalls 241.

[0046] Reference Figures 3 to 9 The second housing 20 has an opening 21. The opening 21 penetrates the housing wall of the second housing 20. The battery pack 1 includes an adapter plate assembly 40 and a connector 50. The adapter plate assembly 40 passes through the opening 21, a portion of the adapter plate assembly 40 is located inside the second housing 20 and connected to the cell assembly 30, and another portion of the adapter plate assembly 40 is located between the second housing 20 and the first housing 10. The connector 50 is connected to the portion of the adapter plate assembly 40 located between the second housing 20 and the first housing 10. At least a portion of the connector 50 is disposed between the second housing 20 and the first housing 10.

[0047] In one example, connector 50 is used to electrically connect the adapter plate assembly 40 to electrical components outside the second housing 20. Optionally, battery pack 1 includes a connector disposed in the first housing 10 for connection to an external device. Connector 50 is connected to the connector. Exemplarily, the connector includes an aero plug.

[0048] The connector 50 includes, but is not limited to, wire harnesses, busbars, etc. Optionally, the connector 50 includes an insulating protective layer covering the outside of the wire harness or copper busbar to reduce the risk of short circuits and improve safety performance.

[0049] The connection methods of connector 50 and adapter plate assembly 40 include, but are not limited to, welding, snap-fit ​​or plug-in.

[0050] In one example, the battery cell 31 includes electrode terminals 311 connected to the adapter plate assembly 40. The connection method between the electrode terminals 311 and the adapter plate assembly 40 includes, but is not limited to, soldering, snap-fitting, or plugging. The battery cell 31 includes a body portion 312, to which the electrode terminals 311 are connected and extended.

[0051] In one example, cell 31 is a rectangular pouch cell. In other examples, cell 31 can be a cylindrical cell or a rigid prismatic cell.

[0052] Reference Figures 4 to 7 The adapter plate assembly 40 passes through the opening 21, facilitating the connection of the battery cell 31 to the portion of the adapter plate assembly 40 located inside the second housing 20, and facilitating the connection of the connector 50 to the portion of the adapter plate assembly 40 located between the second housing 20 and the first housing 10. The connector 50 is separated from the battery cell assembly 30, which helps to reduce the adverse effects of thermal runaway of the battery cell 31 on the connector 50.

[0053] The battery pack 1 includes a seal 60 that fills the opening 21. A seal is formed between the adapter plate assembly 40 and the second housing 20.

[0054] In one example, the seal 60 includes, but is not limited to, foam, gasket, etc., and the gasket may be made of silicone or rubber, for example.

[0055] In one example, the seal 60 is connected to at least one of the adapter plate assembly 40 and the second housing 20. The connection of the seal 60 to the adapter plate assembly 40 and / or the second housing 20 includes, but is not limited to, adhesive bonding.

[0056] In one example, the seal 60 is a one-piece molded structure, which helps to improve the sealing effect. In another example, the seal 60 includes multiple sealing segments that are separately arranged or interconnected.

[0057] The portion of the adapter plate assembly 40 located within the opening 21 has a gap between it and the second housing 20, allowing a portion of the adapter plate assembly 40 to extend through the opening 21. The seal 60 fills at least a portion of the gap between the adapter plate assembly 40 and the second housing 20. On the one hand, this helps to secure the adapter plate assembly 40 and reduce its shaking. On the other hand, it helps to form a seal between the adapter plate assembly 40 and the second housing 20, improving the sealing effect between them. This prevents high-temperature substances generated by thermal runaway of the cell 31 from being ejected from the opening 21, reducing the risk of high-temperature substances damaging the connector 50 and causing a short circuit, thus improving the reliability and safety of the battery pack 1.

[0058] In one example, refer to Figure 9 Along the thickness direction of the adapter plate assembly 40, the seal 60 surrounds the outside of the adapter plate assembly 40. A portion of the seal 60 is located on both sides of the adapter plate assembly 40 in its own thickness direction. The thickness direction of the adapter plate assembly 40 can be a third direction Z.

[0059] Optionally, the seal 60 is strip-shaped, and during assembly, the seal 60 is wrapped around the adapter plate assembly 40 to form a ring structure.

[0060] Optionally, the seal 60 is annular and is sleeved on the outside of the adapter plate assembly 40.

[0061] Optionally, the seal 60 includes multiple sealing segments connected to form a ring structure.

[0062] The seal 60 surrounds the adapter plate assembly 40, which helps to fill the gaps between the various areas of the outer periphery of the adapter plate assembly 40 and the second housing 20, thereby improving the sealing effect between the adapter plate assembly 40 and the second housing 20.

[0063] In one example, at least a portion of the seal 60 is clamped between the adapter plate assembly 40 and the second housing 20.

[0064] Optionally, at least a portion of the seal 60 is compressed under the clamping action of the adapter plate assembly 40 and the second housing 20.

[0065] The adapter plate assembly 40 and the second housing 20 clamp the seal 60, which helps to reduce the gap between the seal 60 and the adapter plate assembly 40, and reduce the gap between the seal 60 and the second housing 20, thereby improving the sealing effect.

[0066] In one example, the adapter plate assembly 40 includes a circuit board 41 that passes through the opening 21. A seal 60 is a flexible structural member, and electronic components are disposed on the surface of the circuit board 41 between the seal 60 and the circuit board 41. The seal 60 is compressed during assembly, which reduces damage to the seal 60 and also reduces the formation of gaps between the seal 60 and the circuit board 41.

[0067] In one example, refer to Figure 9 The circuit board 41 has a groove 411, in which a portion of the seal 60 is accommodated, which helps to limit the position of the seal 60 and facilitates assembly.

[0068] A portion of the circuit board 41 is located between the second housing 20 and the first housing 10, and the connector 50 is connected to the portion of the circuit board 41 located between the second housing 20 and the first housing 10.

[0069] Optionally, the circuit board 41 includes a printed circuit board, and the seal 60 surrounds the outside of the printed circuit board, which facilitates the sealing of the seal 60 by the circuit board 41 and the second housing 20.

[0070] In one example, the adapter plate assembly 40 includes a conductive sheet 42 disposed on a circuit board 41, the conductive sheet 42 being located inside the second housing 20, and the battery cell 31 being connected to the conductive sheet 42. Optionally, electrode terminals 311 are soldered to the conductive sheet 42.

[0071] Reference Figure 5 and Figure 9 Along the thickness direction (third direction Z) of the circuit board 41, the circuit board 41 includes a first surface 41a and a second surface 41b disposed opposite to each other, with the first surface 41a facing the main body 312 of the battery cell 31. The circuit board 41 includes a first side surface 41c and a second side surface 41d disposed opposite to each other along the first direction X, with the second side surface 41d facing the second bottom wall 23. The circuit board 41 includes a third side surface 41e and a fourth side surface (not shown in the figure) disposed opposite to each other along the second direction Y, with the third side surface 41e located between the second housing 20 and the first housing 10. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other.

[0072] Optionally, at least one of the first side surface 41c and the second side surface 41d is provided with a groove 411. The length of the groove 411 along the second direction Y is greater than or equal to the length of the seal 60 along the second direction Y.

[0073] During assembly, the seal 60 is first placed on the outside of the circuit board 41, so that a part of the seal 60 is accommodated in the groove 411; then the circuit board 41 is assembled to the second housing 20, so that a part of the circuit board 41 extends out of the second housing 20 through the opening 21, and the seal 60 is engaged in the opening 21.

[0074] The groove 411 guides and indicates the installation position of the seal 60. The groove 411 also limits the seal 60, which helps to restrict the displacement of the seal 60 relative to the circuit board 41, thereby improving the accuracy of the relative position of the seal 60 and the opening 21 and improving the sealing effect.

[0075] In one example, the portion of the seal 60 that is accommodated in the groove 411 is bonded to the circuit board 41. This helps reduce the risk of the seal 60 shifting during assembly, causing it to be misaligned relative to the opening 21 or even unable to be installed in the opening 21, thereby improving the sealing effect.

[0076] In one example, the seal 60 is bonded to the surface of the circuit board 41 along the third direction Z.

[0077] In one example, refer to Figure 5 The battery pack 1 includes an adhesive member 70, at least a portion of which is disposed on the outer side of the seal 60 away from the cell assembly 30. The adhesive member 70 adhesively bonds the seal 60 and the adapter plate assembly 40. The adhesive member 70 also adhesively bonds the seal 60 and the second housing 20.

[0078] The adhesive 70 includes, but is not limited to, potting compound, glue, solid glue, etc.

[0079] Optionally, the adhesive 70 is integrally disposed between the second housing 20 and the first housing 10.

[0080] Optionally, a portion of the adhesive 70 is disposed between the second housing 20 and the first housing 10, and a portion of the adhesive 70 may penetrate into the gap between the seal 60 and the adapter plate assembly 40, or into the gap between the seal 60 and the second housing 20.

[0081] The adhesive component 70 bonds the seal 60 and the adapter plate assembly 40, which helps to improve the connection stability and sealing effect of the seal 60 and the adapter plate assembly 40.

[0082] In one example, refer to Figure 7 The second housing 20 has a recess 22 on the side facing the first housing 10, and an opening 21 penetrates the bottom wall 221 of the recess 22. At least a portion of the adhesive 70 is accommodated in the recess 22.

[0083] The recess 22 provides a first space for accommodating the adhesive 70, facilitating the placement of flowable adhesive or potting compound within the recess 22. After the adhesive or potting compound cures, the adhesive 70 is formed, bonding the sealant 60 and the adapter plate assembly 40, and bonding the sealant 60 and the second housing 20. The recess 22 also allows the adhesive 70 to deposit to a certain thickness within the recess 22, improving the sealing effect.

[0084] In one example, refer to Figure 7 , Figures 10 to 13 The second housing 20 includes a first housing portion 20a and a second housing portion 20b disposed along a first direction X. The first housing portion 20a and the second housing portion 20b are connected to form a receiving space, and the battery cell assembly 30 is located within the receiving space.

[0085] Optionally, both the first housing portion 20a and the second housing portion 20b are hollow structures with one end open, the open end of the first housing portion 20a is connected to the open end of the second housing portion 20b, and the cell assembly 30 is located between the first housing portion 20a and the second housing portion 20b.

[0086] The first housing portion 20a includes a second top wall 25 and a first housing portion peripheral wall 26. The first housing portion peripheral wall 26 is annular. The second top wall 25 is connected to the first housing portion peripheral wall 26 and blocks one end opening of the first housing portion peripheral wall 26. The other end of the first housing portion peripheral wall 26 opposite to the second top wall 25 forms the opening end of the first housing portion 20a.

[0087] The second housing portion 20b includes a second bottom wall 23 and a second housing portion peripheral wall 27. The second housing portion peripheral wall 27 is annular. The second bottom wall 23 is connected to the second housing portion peripheral wall 27 and blocks one end opening of the second housing portion peripheral wall 27. The end of the second housing portion peripheral wall 27 opposite to the second bottom wall 23 forms the opening end of the second housing portion 20b.

[0088] The first housing peripheral wall 26 and the second housing peripheral wall 27 are connected to form the second peripheral wall 24. The connection methods of the first housing peripheral wall 26 and the second housing peripheral wall 27 include, but are not limited to, screw connection, riveting, welding, snap-fit, and bonding.

[0089] In another example, the second peripheral wall 24 is entirely disposed in the first housing portion 20a or the second housing portion 20b.

[0090] In one example, refer to Figure 7 The peripheral wall 26 of the first housing portion includes a plurality of first sub-side walls 261, and the structures of the four first sub-side walls 261 may be exactly the same or different.

[0091] In one example, refer to Figure 7 The peripheral wall 27 of the second housing portion includes four second sub-side walls 271, and the structures of the four second sub-side walls 271 can be exactly the same or different.

[0092] The first sub-sidewall 261 and the second sub-sidewall 271 are connected to form the second sidewall 241.

[0093] Optionally, the first housing portion 20a is a one-piece molded structure. The second housing portion 20b is a one-piece molded structure.

[0094] The second housing 20 includes a first housing portion 20a and a second housing portion 20b, which facilitates reducing the depth of the first housing portion 20a and the second housing portion 20b along the first direction X, thereby reducing the assembly difficulty of the cell assembly 30 and the adapter plate assembly 40 with the second housing 20.

[0095] In one example, refer to Figure 7 , Figures 10 to 13 The opening 21 includes a first portion 21a and a second portion 21b that are connected. The first portion 21a penetrates through the first housing portion 20a, and the second portion 21b penetrates through the second housing portion 20b. Optionally, the first portion 21a and the second portion 21b are opposite to each other along a first direction X. The first portion 21a is disposed on the peripheral wall 26 of the first housing portion, and the second portion 21b is disposed on the peripheral wall 27 of the second housing portion.

[0096] During assembly, the adapter plate assembly 40 is first assembled to the second housing part 20b, a part of the adapter plate assembly 40 and a part of the seal 60 are snapped into the second part 21b, and then the first housing part 20a is covered on the top of the second housing part 20b, and a part of the adapter plate assembly 40 and another part of the seal 60 are snapped into the first part 21a.

[0097] The opening 21 includes a first part 21a and a second part 21b respectively provided in the first housing part 20a and the second housing part 20b, which helps to reduce the assembly difficulty of the seal 60.

[0098] In one example, refer to Figures 10 to 13 The recess 22 includes a first sub-recess 22a and a second sub-recess 22b. The first sub-recess 22a is disposed on the side of the first housing portion 20a facing the first housing 10, and the second sub-recess 22b is disposed on the side of the second housing portion 20b facing the first housing 10. The first sub-recess 22a and the second sub-recess 22b are disposed opposite to each other along a first direction X, and the first sub-recess 22a is connected to the second sub-recess 22b. The first sub-recess 22a and the second sub-recess 22b are connected to form the recess 22.

[0099] The bottom wall 221 of the recess 22 includes the bottom wall of the first sub-recess 22a and the bottom wall of the second sub-recess 22b.

[0100] In one example, opening 21 extends through second housing 20 along the second direction Y. The length of seal 60 along the second direction Y is greater than the thickness of second housing 20. A portion of seal 60 is accommodated within opening 21, and both ends of seal 60 along the second direction Y are located outside opening 21. The greater length of seal 60 along the second direction Y increases the contact area between seal 60 and second housing 20, and between seal 60 and adapter plate assembly 40, thereby improving the sealing effect.

[0101] In one example, the adhesive 70 includes potting compound. The potting compound either completely fills the recess 22 or partially fills the recess 22.

[0102] Optionally, the adhesive 70 at least partially covers the interface between the seal 60 and the adapter plate assembly 40, as well as the interface between the seal 60 and the second housing 20.

[0103] When filling the recess 22 with potting compound, placing the side of the second housing 20 with the recess 22 facing upwards helps to reduce potting compound leakage.

[0104] The potting compound has fluidity, which is beneficial for filling the gaps between the sealant 60 and the adapter plate assembly 40, as well as between the sealant 60 and the bottom wall 221, thereby improving the sealing effect.

[0105] Optionally, the adhesive 70 covers the seal 60.

[0106] In one example, the battery pack 1 includes a first pressure relief section disposed on a second housing 20. The second housing 20 includes multiple housing walls, with the first pressure relief section and the opening 21 disposed on different housing walls.

[0107] The first pressure relief section is used to release pressure in a directed manner when a large amount of gas is generated in the cell assembly 30, causing a sharp increase in the internal pressure of the second housing 20, in order to reduce the risk of explosion.

[0108] Optionally, refer to Figure 7 The first pressure relief part includes a pressure relief port 80 and a first cover (not shown in the figure). The pressure relief port 80 penetrates the shell wall of the second housing 20, and the first cover is disposed on the outer side of the second housing 20 and covers the pressure relief port 80.

[0109] Alternatively, the first pressure relief section may include an explosion-proof plate or a pressure relief valve.

[0110] The first pressure relief section and the opening 21 are respectively located on different shell walls of the second shell 20. The high-temperature material ejected from the first pressure relief section is less likely to directly act on the connector 50 and the adapter plate assembly 40, which helps to reduce the adverse effects on the connector 50 and the adapter plate assembly 40 and improve the safety of the battery pack 1.

[0111] In one example, a first pressure relief portion is provided on the second bottom wall 23, an opening 21 is provided on the second peripheral wall 24, and at least a portion of the connector 50 is located between the first peripheral wall 12 and the second peripheral wall 24.

[0112] The first pressure relief section is located on the second bottom wall 23. The substance released from the first pressure relief section is discharged from the second bottom wall 23 to the space between the first bottom wall 11 and the second bottom wall 23, and then discharged through the second housing 20. This helps to reduce the temperature of the top of the first housing 10 and reduce the impact on the top of the first housing 10.

[0113] An opening 21 is provided on the second peripheral wall 24 to facilitate the connection between the connector 50 and the adapter plate assembly 40. At least a portion of the connector 50 is located between the first peripheral wall 12 and the second peripheral wall 24, which helps to reduce the adverse effects of substances discharged from the first pressure relief section on the connector 50 and improves the reliability of the connection.

[0114] In an alternative example, the first pressure relief section and the opening 21 are respectively disposed on different second sidewalls 241.

[0115] In one example, the battery pack 1 includes a vent 91 disposed in the first housing 10, the vent 91 being configured to discharge substances released by the first pressure relief section to the outside of the battery pack 1. The vent 91 includes a pressure relief valve disposed in the first housing 10, or the vent 91 includes a through hole penetrating the first housing 10.

[0116] In one example, refer to Figure 8 and Figure 9 The adapter board assembly 40 includes a circuit board 41 and electrical components disposed on the circuit board 41, the electrical components being located within the second housing 20. Along the thickness direction of the circuit board 41, the seal 60 protrudes from the second surface 41b by a length of L1, and the electrical components protrude from the second surface 41b by a length of L2, where L1 > L2.

[0117] The length of an electrical component protruding from the second surface 41b refers to the highest height of all electrical components protruding from the second surface 41b. The number of electrical components can be multiple, or it can include different electrical components. Electrical components include, but are not limited to, conductive sheets 42, chips, capacitors, resistors, etc.

[0118] The seal 60 protrudes further from the circuit board 41, which helps to reduce the impact between electrical components and other parts and reduces the risk of damage to electrical components.

[0119] In one example, refer to Figure 7 The battery pack 1 includes a separator 92, and the number of cell assemblies 30 can be two. The separator 92 divides the second housing 20 into two chambers, and the cell assembly 30 and the adapter plate assembly 40 in the same chamber are interconnected. During assembly, the seal 60 can contact the separator 92 first, reducing the risk of interference or damage to electrical components by the separator 92 during assembly.

[0120] In another example, partition 92 divides the second housing 20 into two chambers, one of which is used to house the cell assembly 30, and the other chamber can be used to house other components.

[0121] In yet another example, battery pack 1 may not have separator 92.

[0122] The second housing 20 has two openings 21, through which two adapter plate assemblies 40 pass respectively. The battery pack 1 includes two seals 60, which are respectively disposed in the two openings 21.

[0123] In one example, both openings 21 penetrate the bottom wall 221 of the recess 22. This allows for bonding of the two seals 60 and the two adapter plate assemblies 40 with an adhesive 70, improving the sealing effect at the two openings 21 and simplifying the structure and assembly process.

[0124] In one example, the second housing 20 has an opening 21.

[0125] This application also provides an energy storage device 2, as shown in the reference. Figure 14 It includes the battery pack 1 provided in any of the foregoing embodiments. The battery pack 1 can provide electrical energy for the operation of the energy storage device 2.

[0126] Energy storage equipment includes, but is not limited to, energy storage containers, energy storage cabinets, energy storage power stations, energy storage battery packs, or portable energy storage systems.

[0127] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery pack, characterized in that, include: First shell; A second housing is housed within the first housing, and the second housing has an opening; The battery cell assembly is housed within the second housing; An adapter plate assembly passes through the opening, a portion of which is located inside the second housing and connected to the cell assembly, and another portion of which is located between the second housing and the first housing; A connector, attached to the portion of the adapter plate assembly located between the second housing and the first housing; as well as A seal is used to fill the opening.

2. The battery pack according to claim 1, characterized in that, The seal surrounds the outside of the adapter plate assembly along its thickness direction.

3. The battery pack according to claim 1 or 2, characterized in that, At least a portion of the seal is clamped between the adapter plate assembly and the second housing.

4. The battery pack according to any one of claims 1-3, characterized in that, The adapter plate assembly includes a circuit board that passes through the opening and has a groove in which a portion of the seal is received.

5. The battery pack according to any one of claims 1-4, characterized in that, The battery pack includes an adhesive element, at least a portion of which is located on the outside of the seal away from the cell assembly, and the adhesive element bonds the seal and the adapter plate assembly.

6. The battery pack according to claim 5, characterized in that, The second housing has a recess on the side facing the first housing, the opening penetrates the bottom wall of the recess, and at least a portion of the adhesive is accommodated in the recess.

7. The battery pack according to claim 5 or 6, characterized in that, The adhesive includes potting compound.

8. The battery pack according to any one of claims 1-7, characterized in that, The battery pack includes a first pressure relief section, which is disposed in the second housing. The second housing includes multiple shell walls, with the first pressure relief section and the opening respectively located on different shell walls.

9. The battery pack according to claim 8, characterized in that, The first housing includes a first bottom wall and a first peripheral wall, and the plurality of shell walls of the second housing include a second bottom wall and a second peripheral wall. The first bottom wall and the second bottom wall are disposed opposite to each other, the first peripheral wall surrounds the outside of the second peripheral wall, and the second peripheral wall surrounds the outside of the cell assembly. The first pressure relief part is located on the second bottom wall, the opening is located on the second peripheral wall, and at least a portion of the connector is located between the first peripheral wall and the second peripheral wall.

10. The battery pack according to any one of claims 1-9, characterized in that, The second housing includes a first housing portion and a second housing portion disposed along a first direction, the first housing portion and the second housing portion being connected to form a receiving space, and the battery cell assembly being located within the receiving space; The opening includes a first part and a second part that are connected, the first part penetrating the first housing portion and the second part penetrating the second housing portion.

11. The battery pack according to any one of claims 1-10, characterized in that, The adapter board assembly includes a circuit board and electrical components disposed on the circuit board, the electrical components being located within a second housing; The battery cell assembly includes a plurality of battery cells. Along the thickness direction of the circuit board, the circuit board includes a first surface and a second surface disposed opposite to each other, with the first surface facing the main body of the battery cell. Along the thickness direction of the circuit board, the length of the seal protruding from the second surface is L1, and the length of the electrical component protruding from the second surface is L2, where L1 > L2.

12. An energy storage device, characterized in that, Includes the battery pack according to any one of claims 1-11.

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