Battery pack and power-consuming device

Abstract

The present application provides a battery pack and an electrical device, wherein the battery pack includes a battery cell module, a first shell, a second shell and a first connecting member, the battery cell module can be placed in a first space of the first shell, the first side wall of the first shell includes a main body and a first recess, the second shell closes the first opening on the first shell, the first connecting member is connected to the second shell and the first side wall of the first shell, the first connecting member can not only strengthen the structural strength of the first side wall, which is conducive to reducing the thickness of the first side wall and improving the energy density of the battery pack, but also can transmit the force acting on the first side wall to the second shell, thereby improving the structural stability of the first shell and helping to improve the safety of the battery pack.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Art

[0002] Rechargeable cells are batteries that can be recharged to activate the active material after the cells are discharged and continue to be used. Rechargeable cells are widely used in electronic devices, such as mobile phones, laptops, etc.

[0003] A battery pack usually includes multiple cells to meet the voltage requirements of electronic devices. In the development of battery technology, how to improve the safety of battery packs has always been a research direction in the industry. Summary of the invention

[0004] In view of the above problems, the present application provides a battery pack and an electrical device, wherein the structural stability of the battery pack is conducive to improving the safety of the battery pack.

[0005] In order to achieve the above-mentioned objectives, the present application adopts the following technical solutions: On the first aspect, the present application provides a battery pack, which includes a battery cell module, a first shell, a second shell and a first connecting member, the battery cell module includes a plurality of battery cells, the first shell is provided with a first space and a first opening connected to the first space, the first shell includes a first side wall, the first side wall includes a main body and a first recess, the second shell closes the first opening, the first connecting member is provided in the first recess, and the first connecting member connects the second shell and the first side wall.

[0006] Through the above technical solution, the first connecting member can not only strengthen the structural strength of the first side wall, which is conducive to reducing the thickness of the first side wall and improving the energy density of the battery pack, but also can transmit the force exerted on the first side wall to the second shell, thereby improving the structural stability of the first shell and improving the safety of the battery pack.

[0007] In some embodiments, the battery pack includes a first insulating member, and multiple battery cells are stacked along a first direction. Along the first direction, the first insulating member is arranged between the battery cells, and the first insulating member is connected to the first recess. The first insulating member 11 can support and protect the battery cells.

[0008] In some embodiments, the first recess includes a first part, a second part and a third part connected between the first part and the second part, the first part is closer to the main body than the third part, and the first part, the second part and the third part form a groove on the side away from the first space.

[0009] In some embodiments, the first connecting member is disposed in a groove, and the first connecting member is connected to at least one of the first part, the second part and the third part, which can not only realize the positioning of the first connecting member, but also serve to accommodate the first connecting member, effectively reducing the possibility of collision between the first connecting member 4 and external devices.

[0010] In some embodiments, the battery cell includes an electrode assembly, a battery cell shell accommodating the electrode assembly, and an electrode terminal connected to the electrode assembly and led out from the battery cell shell; along the second direction, a gap is provided between the battery cell shell and the first part, the second direction is perpendicular to the first direction, and the gap separates the battery cell shell from the first recess, thereby reducing the impact on the battery cell and further improving the safety of the battery pack.

[0011] In some embodiments, the battery pack includes a first insulating member, which is arranged between the battery cells along a first direction and extends beyond the battery cell housing along a second direction. Along the first direction, the projection of the first insulating member and the projection of the gap overlap, and the force exerted on the battery cells can be transmitted to the first insulating member, thereby limiting the movement of the battery cell module in the second direction and reducing the impact on the battery cells in the battery cell module.

[0012] In some embodiments, the first shell includes two second side walls arranged opposite to each other along a third direction, the first side wall is provided with two first recesses, at least part of the first insulating member is located between the two first recesses, and at least part of the first insulating member is clamped between the two first recesses 21, so that the battery cell module is positioned by the first insulating member being clamped by the two first recesses.

[0013] In some embodiments, the battery pack includes two second shells. Along the first direction, the first shell is provided with two first openings. The two second shells close the two first openings. The two ends of the first connecting member are respectively connected to the two second shells. The two second shells close the two first openings, so that the first space forms an independent cavity, which can protect the battery cell module located therein. The first connecting member is connected between the two second shells, so that the second shell can be clamped at both ends of the battery cell module, and the battery cell module can be clamped and pressurized, which is beneficial to improve the overall stiffness and strength of the battery cell module.

[0014] In some embodiments, the first side wall is provided with a first bending portion, which is arranged on a side of the second side wall away from the first space and connected to the second side wall, so that the second side wall can be connected to the inner side of the first side wall close to the first space through the first bending portion.

[0015] In some embodiments, the second side wall includes a second bent portion disposed between the first recess and the first bent portion, and the second bent portion is connected to the first recess, which can enhance the structural strength of the first recess and reduce the impact of the second bent portion on the abutment between the battery cell module 1 and the first recess 21.

[0016] In some embodiments, the first bent portion is connected to the second side wall via a fastener, and the fastener can be supported on the side of the second bent portion away from the first recess, which not only increases the stiffness of the connection between the first side wall and the second side wall, but also can support the first connecting member through the first recess, helping to increase the overall strength and stiffness of the first shell, thereby helping to reduce the thickness of the first shell and improve the energy density of the battery pack.

[0017] In some embodiments, a second cavity is formed in the second shell, and the second cavity is connected to the first space. A fire detection tube containing fire extinguishing gas is provided in the second cavity. When thermal runaway occurs in the battery cell module, the fire extinguishing aerosol in the fire detection tube can enter the first space from the second cavity to cool the battery cell module or extinguish the fire, thereby improving the safety of the battery pack.

[0018] In some embodiments, the second shell includes an end plate and a cover plate, and an enclosure is provided on the side of the end plate close to the first space, and the cover plate is covered on the enclosure, and the end plate, the enclosure and the cover plate form a second cavity; the enclosure is provided with a connecting hole, and the connecting hole connects the second cavity and the first space, so that the fire extinguishing aerosol in the fire detection tube can enter the first space from the connecting hole.

[0019] In some embodiments, the battery pack also includes a first bus and a second bus connected to the tabs of the battery cell, at least one of the first bus and the second bus is provided with a support, and at least one of the first bus and the second bus is supported against the first shell through the support, so that at least one of the first bus and the second bus is positioned on the battery module by being supported by the support.

[0020] The present application also provides an electrical device, which has high safety.

[0021] In a second aspect, the present application provides an electrical device, which includes a battery pack provided by any of the above technical solutions, and the battery pack is used to provide electrical energy.

[0022] The technical solution provided by the embodiments of the present disclosure brings at least the following beneficial effects:

[0023] The present application provides a battery pack, which includes a battery cell module, a first shell, a second shell and a first connecting member. The battery cell module can be placed in a first space of the first shell. The first side wall of the first shell includes a main body and a first recess. The second shell closes the first opening on the first shell. The first connecting member is connected to the second shell and the first side wall of the first shell. The first connecting member can not only strengthen the structural strength of the first side wall, which is beneficial to reducing the thickness of the first side wall and improving the energy density of the battery pack, but also can transmit the force acting on the first side wall to the second shell, thereby improving the structural stability of the first shell and helping to improve the safety of the battery pack.

[0024] The present application also provides an electrical device, which includes the battery pack provided by the above technical solution and has high safety.

[0025] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0027] Figure 1 A disassembled diagram of a battery pack provided in some embodiments of the present application;

[0028] Figure 2 A partial schematic diagram of the connection between the battery cell module and the first shell provided in some embodiments of the present application;

[0029] Figure 3 A schematic diagram of the connection between the first housing and the first connecting member provided in some embodiments of the present application;

[0030] Figure 4 for Figure 3 The enlarged schematic diagram of point A in the middle;

[0031] Figure 5 A schematic diagram of the structure of some battery cell modules provided in some embodiments of the present application;

[0032] Figure 6 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0033] Figure 7 A schematic diagram of the connection between the battery module and the first housing provided in some embodiments of the present application;

[0034] Figure 8 A schematic diagram of the positions of the battery cell and the first recess provided in some embodiments of the present application;

[0035] Fig. 9 A disassembled diagram of a first housing provided in some embodiments of the present application;

[0036] Fig.10 A disassembled diagram of a second housing provided in some embodiments of the present application;

[0037] Fig.11 A schematic diagram of the structure of the second housing with the cover plate removed provided in some embodiments of the present application;

[0038] Fig.12 A schematic diagram of the connection between the battery cell module and the connection bar provided in some embodiments of the present application;

[0039] Fig.13 A schematic diagram of an electrical device provided in some embodiments of the present application.

[0040] In the figure: 1. battery cell module; 11. first insulating member; 12. battery cell; 121. battery cell shell; 122. electrode terminal; 123. gap; 2. first shell; 20. main body; 21. first recess; 211. first part; 212. second part; 213. third part; 23. first side wall; 231. first bending part; 24. second side wall; 241. second bending part; 25. fastener; 26. first space; 3. second shell; 30. second cavity; 31. end plate; 311. enclosure; 3111. connecting hole; 32. cover plate; 4. first connecting member; 5. first bus; 6. second bus; 7. support member; 8. fire detection tube. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0042] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0043] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0044] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0045] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0046] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] At present, from the perspective of market development, the application of battery packs is becoming more and more extensive. Battery packs are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as communication equipment, military equipment and aerospace and other fields. With the continuous expansion of the application field of battery packs, its market demand is also constantly expanding.

[0048] The technical solution of a battery pack and an electrical device provided by the present application is further described below through specific implementation methods.

[0049] Please refer to Figure 1Some embodiments of the present application provide a battery pack, which includes a battery cell module 1, a first shell 2, a second shell 3 and a first connecting member 4, wherein a first space 26 is formed in the first shell 2, the battery cell module 1 is accommodated in the first space 26 of the first shell 2, the second shell 3 is covered at the opening of the first space 26, and the first connecting member 4 is placed on the first shell 2 and connected to the second shell 3, which not only enhances the structural strength of the first shell 2 and the protection of the battery cell module 1, but also enables the force acting on the first shell 2 to be transmitted to the second shell 3 through the first connecting member 4, thereby strengthening the connection between the first shell 2 and the second shell 3, enhancing the overall structural strength of the first shell 2 and the second shell 3, and improving the protection of the battery pack.

[0050] In some embodiments of the present application, Figure 2 and Figure 3 As shown, the first housing 2 includes a first side wall 23, the first side wall 23 includes a main body 20 and a first recess 21, the first recess 21 protrudes relative to the main body 20 toward a side close to the battery module 1, the first housing 2 is provided with a first opening communicating with the first space 26, and the second housing 3 covers the first opening to close the first opening. The first connector 4 is provided in the first recess 21, and the first connector 4 is connected to the second housing 3 and the first side wall 23 to connect the first housing 2 and the second housing 3.

[0051] The first connecting member 4 is arranged in the first recess 21. The first connecting member 4 can not only strengthen the structural strength of the first side wall 23, which is beneficial to reducing the thickness of the first side wall 23 and improving the energy density of the battery pack, but also can transfer the force exerted on the first recess 21 to the second shell 3, thereby improving the structural stability of the first shell 2 and helping to improve the safety of the battery pack.

[0052] like Figure 4 As shown, the first recessed portion 21 includes a first portion 211, a second portion 212 and a third portion 213. The first portion 211 and the second portion 212 are bent toward the first space 26 relative to the main body 20, and the third portion 213 is connected between the first portion 211 and the second portion 212, so that the first recessed portion 21 is protruding from the main body 20. The first portion 211 is closer to the main body 20 relative to the third portion 213, and the first portion 211, the second portion 212 and the third portion 213 form a groove on the side away from the first space 26.

[0053] like Figure 4 As shown, in some embodiments, the depth of the groove in the third direction is greater than or equal to the thickness of the first connector 4, so that the first connector 4 can be completely placed in the groove in the thickness direction, which can effectively reduce the possibility of collision between the first connector 4 and external devices.

[0054] In some embodiments of the present application, the outer surface of the first connector 4 is connected to at least one of the first part 211, the second part 212 and the third part 213, which is conducive to the force on the first recess 21 being transmitted to the first connector 4. In some embodiments, the outer surface of the first connector 4 is connected to the surface of the first part 211 close to the groove, in some embodiments, the outer surface of the first connector 4 is connected to the surface of the second part 212 close to the groove, and in some embodiments, the outer surface of the first connector 4 is connected to the surface of the third part 213 close to the groove, and the first connector 4 is clamped between the first part 211, the second part 212 and the third part 213, so that the first connector 4 is firmly positioned in the groove of the first recess 21 and is not easy to fall off. The connection here can be a direct contact connection; it can also be connected through other structural members, such as glue, connecting bolts, etc.; it can also be through other compressible structural members, such as foam, elastic gaskets with bonding ability, etc. Specifically, the first part 211, the second part 212 and the third part 213 are formed by bending on the first side wall 23, so that the processing of the first recess 21 is convenient.

[0055] In some embodiments, the cross-sectional shape of the groove is set to be a square, the cross-sectional shape of the first connector 4 is set to be a square, and the four corners of the first connector 4 are chamfered to facilitate the first connector 4 to be installed in the groove. The first connector 4 is made of 6063 aluminum alloy, so that the first connector 4 has better strength and rigidity, further improving the protection of the battery module 1. .

[0056] In some embodiments of the present application, Figure 5 As shown, the battery module 1 includes a plurality of battery cells 12. Figure 6As shown, the battery cell 12 includes an electrode assembly (not shown in the figure), a battery cell shell 121, and an electrode terminal 122 connected to the electrode assembly and led out from the battery cell shell 121. The electrode assembly includes a winding or laminated structure formed by winding a positive electrode sheet, a negative electrode sheet and a separator. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode collector. Taking the battery cell of a lithium-ion battery as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode collector. The material of the negative electrode collector can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc. The material of the battery cell housing 121 may also include a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. Optionally, the battery cell 12 also includes a soft-pack battery cell. Optionally, the battery cell housing 121 includes an aluminum-plastic film.

[0057] In some embodiments, Figure 5 As shown, the battery module 1 includes a first insulating member 11, and the first insulating member 11 and the battery 12 are stacked along a first direction. Along the first direction, the first insulating member 11 is arranged between the battery cells 12. The battery cell 12 is connected to the side of the first insulating member 11, and the first insulating member 11 completely covers the side of the battery cell 12. The first insulating member 11 can support and protect the battery cell 12. In some embodiments of the present application, the surface of the first insulating member 11 includes an insulating material, so that the first insulating member 11 has insulating ability. Optionally, the first insulating member 11 can be formed of a composite material, for example, by coating an insulating material on the surface of a metal material. Optionally, the first insulating member 11 is made of foam, which is soft and can not only protect the battery cell 12, but also absorb the expansion of the battery cell 12 to a certain extent, providing expansion space for the battery cell 12.

[0058] In some embodiments, the first insulating member 11 is made of microporous polypropylene foam with a Shore hardness greater than 60 measured by a C-type Shore hardness tester, and its thickness range can be more than 8 mm. Optionally, the foam has fireproof and heat-insulating properties, the thermal conductivity of the foam is less than 0.03, and meets the flame retardant V0 requirement. After two 10-second combustion tests on the sample, the flame is extinguished within 30 seconds, and no burning objects can fall. It is required that the sample is impacted with an acetylene flame for 10 minutes without burning through the sample. The first insulating member 11 can play an isolating role when thermal runaway occurs in the battery module 1, which is conducive to preventing the spread of thermal runaway.

[0059] Further, along the first direction, the battery cell 12 is sandwiched between two adjacent first insulating members 11. The battery cell 12 is connected to the first insulating member 11 by double-sided tape, so that the first insulating member 11 and the battery cell 12 are connected as a whole. The battery cell 12 can also be connected to the first insulating member 11 by adhesive materials such as glue, and those skilled in the art can select the connection structure between the battery cell 12 and the first insulating member 11 according to actual conditions. In some embodiments, two, three, four or more battery cells 12 can be connected as a whole and then connected to the first insulating member 11, which is beneficial to reduce the number of first insulating members 11 used, increase the proportion of the battery cell 12 in the battery cell module 1, and help improve the energy density of the battery pack.

[0060] In some embodiments of the present application, a gap 123 is provided between the cell housing 121 and the first portion 211 along the second direction, the second direction is perpendicular to the first direction, and the gap 123 separates the cell housing 121 from the first recess 21, reducing the impact on the cell 12 and further improving the safety of the battery pack. Along the first direction, the first insulating member 11 is provided between the cells 12, and along the second direction, the first insulating member 11 extends beyond the cell housing 121, and along the first direction, the projection of the first insulating member 11 overlaps with the projection of the gap 123. Along the first direction, the length of the first insulating member 11 is greater than the length of the cell housing 121, and when the first insulating member 11 abuts against the first recess 21, the cell 12 is limited, and the cell housing 121 cannot interact with the first recess 21, reducing the impact on the cell 12 and further ensuring the safety of the battery pack. The first insulating member 11 abuts against the surface of the first portion 211, so that the cell 12 is limited in the first space 26. The first insulating member 11 and the first recess 21 abut against each other, and the first insulating member 11 and the first recess 21 are in contact, and there is a mutual force between the two. Through the abutment, the first recess 21 can limit the first insulating member 11. When the battery pack is impacted, the first insulating member 11 of the cell module 1 can abut against the first recess 21, limiting the movement of the cell module 1, thereby limiting the displacement of the cell 12, reducing the impact on the cell 12, and protecting the cell 12, which is beneficial to improving the safety of the battery pack.

[0061] like Figure 3 As shown, the first side wall 23 is provided with two first recesses 21 spaced apart along the second direction, and at least a portion of the first insulating member 11 is located between the two first recesses 21 and abuts against the two first recesses 21, so that at least a portion of the first insulating member 11 is clamped between the two first recesses 21, thereby achieving positioning of the battery cell module 1 by clamping the first insulating member 11 between the two first recesses 21.

[0062] When the battery pack is subjected to vibration or impact during transportation, the force on the battery cell 12 in the second direction is transmitted to the first insulating member 11, and the first insulating member 11 can limit the movement of the battery module 1 in the second direction, thereby reducing the impact on the battery cell 12 in the battery module 1. The first recess 21 is connected to the first connector 4, and the first recess 21 transmits the force to the first connector 4, and further to the second housing 3, which is conducive to reducing the possibility of deformation of the first side wall 23.

[0063] like Figure 3 and Fig. 9 As shown, the first shell 2 includes two first side walls 23 arranged opposite to each other along a third direction and two second side walls 24 arranged opposite to each other along a second direction, the two first side walls 23 are parallel and spaced apart, the two second side walls 24 are parallel and spaced apart, and each first side wall 23 is connected between the two second side walls 24 to enclose a first space 26 for accommodating the battery cell module 1.

[0064] In some embodiments, the first side wall 23 is provided with a first bending portion 231, which is arranged on a side of the second side wall 24 away from the first space 26 and connected to the second side wall 24, and the two second side walls 24 are respectively connected to the inner side of the first side wall 23 close to the first space 26.

[0065] The second side wall 24 is provided with a second bending portion 241, which is provided between the first recess 21 and the first bending portion 231. The second bending portion 241 is connected to the side of the first recess 21 away from the first insulating member 11, which can enhance the structural strength of the first recess 21 and reduce the influence of the second bending portion 241 on the abutment between the battery module 1 and the first recess 21. The connection here can be a direct contact connection; it can also be connected through other structural parts, such as glue, connecting bolts, etc.; it can also be through other compressible structural parts, such as foam, elastic gaskets with bonding ability, etc. The second bending portion 241 is abutted against the side of the second part 212 of the first recess 21 away from the first recess, so that the first side wall 23 and the second side wall 24 are easy to assemble. The abutment here can be that the second bending portion 241 is in direct contact with the second part 212, and there is a certain force between the two. Furthermore, the second side wall 24 is provided with reinforcing ribs, which may be formed on the second side wall 24 by a stamping process, thereby facilitating improving the rigidity of the second side wall 24 .

[0066] In some embodiments of the present application, the first bent portion 231 is connected to the second side wall 24 through a fastener 25, and the fastener 25 can abut against the side of the second bent portion 241 away from the first recess 21. The fastener 25 can be a connecting bolt, which is connected to the second side wall 24 and the stud of the connecting bolt abuts against the side of the second bent portion 241 away from the first recess 21, so that the first recess 21, the first bent portion 231, the second side wall 24 and the second bent portion 241 support each other, which not only increases the rigidity of the connection between the first side wall 23 and the second side wall 24, but also can support the first connector 4 through the first recess 21, which helps to increase the overall strength and rigidity of the first shell 2, thereby helping to reduce the thickness of the first shell 2 and improve the energy density of the battery pack.

[0067] In some embodiments, the first side wall 23 and the second side wall 24 are made of hot-dip galvanized steel plates, which have good strength and corrosion resistance and can provide good protection for the battery cell module 1 .

[0068] like Figure 1 As shown, two second shells 3 are provided, and along the first direction, the first shell 2 is provided with two first openings, and the two second shells 3 are respectively covered at the first openings at both ends of the first space 26, so that the first space 26 forms an independent cavity, which can protect the battery module 1 located therein. The two second shells 3 are respectively clamped at both ends of the battery module 1, and the two ends of the first connecting member 4 are respectively connected to the two second shells 3. Under the action of the first connecting member 4, the second shell 3 can be clamped at both ends of the battery module 1, and the battery module 1 can be clamped and pressurized, which is beneficial to improve the overall rigidity and strength of the battery module 1, and is beneficial to improve the performance and safety of the battery 12.

[0069] The two ends of the first connecting member 4 are connected to the two second housings 3 by fasteners, respectively. The operator can use the fasteners to lock the connection between the first connecting member 4 and the second housing 3 according to actual conditions during the use of the battery pack, so as to enhance the firm connection between the first connecting member 4 and the second housing 3. The fastener can be a bolt assembly, and a threaded hole is provided on the first connecting member 4. The first connecting member 4 and the second housing 3 are locked and connected by the bolt assembly, so that the first connecting member 4 and the second housing 3 are not only convenient to disassemble, but also convenient to fasten.

[0070] In some embodiments, the second housing 3 is made of a sheet molding compound material, so that the second housing 3 has sufficient strength and rigidity, and also has good insulation properties.

[0071] A second cavity 30 is formed in the second shell 3, and the second cavity 30 is communicated with the first space 26. A fire detection tube containing fire extinguishing gas is provided in the second cavity 30. When thermal runaway occurs in the battery cell module 1, the fire extinguishing aerosol in the fire detection tube can enter the first space 26 from the second cavity 30 to cool down or extinguish the battery cell module 1, thereby improving the safety of the battery pack.

[0072] In some embodiments, Fig.10 As shown, the second housing 3 includes an end plate 31 and a cover plate 32. A baffle 311 is provided on the side of the end plate 31 close to the first space 26, and the cover plate 32 is covered on the baffle 311. Fig.11 As shown, the end plate 31, the enclosure 311 and the cover plate 32 enclose the second cavity 30; the enclosure 311 is provided with a connecting hole 3111, which connects the second cavity 30 with the first space 26, so that the fire extinguishing aerosol in the fire detection tube can enter the first space 26 from the connecting hole 3111. The connecting holes 3111 on the enclosure 311 are evenly arranged at equal intervals, so that the fire extinguishing aerosol in the fire detection tube can be evenly discharged into the first space 26.

[0073] like Fig.12 As shown, the battery pack also includes a first busbar 5 and a second busbar 6 connected to the tab 122 of the battery cell 12, at least one of the first busbar 5 and the second busbar 6 is provided with a support member 7, and at least one of the first busbar 5 and the second busbar 6 is supported by the support member 7 against the first shell 2, so that at least one of the first busbar 5 and the second busbar 6 is supported and positioned on the battery module by the support member 7. The first busbar 5 and the second busbar 6 are both provided with a support member 7, and the support member 7 is clamped between the battery cell module 1 and the second side wall 24. The support member 7 supports the first busbar 5 and the second busbar 6, and supports and positions the first busbar 5 and the second busbar 6 on the battery cell module 1. Specifically, the support member 7 is made of foam, which is soft and can protect the battery cell 12 and has good insulation. Optionally, the material of the first busbar 5 may include copper. Optionally, the material of the second busbar 6 may include copper.

[0074] Some embodiments of the present application further provide an electrical device, which includes a battery pack provided by the above technical solution, and the battery pack is used to provide electrical energy to the electrical device.

[0075] like Fig.13As shown, the embodiment of the present application provides an electric device 3000 using a battery pack 2000 as a power source. The electric device 3000 may be an energy storage device, an uninterruptible power supply, an electric vehicle, a mobile phone, a portable device, a laptop computer, an electric toy, an electric tool, etc. The electric tool includes a metal cutting electric tool, a cleaning tool, etc., for example, an electric drill, an electric wrench, a vacuum cleaner, a sweeping robot, etc. The embodiment of the present application does not impose any special restrictions on the above-mentioned electric device 3000.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery pack, characterized in that: include: A battery cell module, including a plurality of battery cells; A first shell is provided with a first space and a first opening communicating with the first space, wherein the first shell comprises a first side wall, and the first side wall comprises a main body and a first recessed portion, a second shell, the second shell closing the first opening; a first connecting member, disposed in the first recess, the first connecting member connecting the second shell and the first side wall; A first insulating member, a plurality of battery cells are stacked along a first direction, the first insulating member is arranged between the battery cells along the first direction, and the first insulating member is connected to the first recess.

2. The battery pack according to claim 1, characterized in that: The first recess includes a first part, a second part and a third part connected between the first part and the second part, the first part is closer to the main body than the third part, and the first part, the second part and the third part form a groove on the side away from the first space.

3. The battery pack according to claim 2, characterized in that: The first connecting member is disposed in the groove, and the first connecting member is connected to at least one of the first part, the second part and the third part.

4. The battery pack according to claim 2, characterized in that: The battery cell includes an electrode assembly, a battery cell case accommodating the electrode assembly, and an electrode terminal connected to the electrode assembly and led out from the battery cell case; A gap is provided between the battery cell housing and the first portion along a second direction, and the second direction is perpendicular to the first direction.

5. The battery pack according to claim 4, characterized in that: The battery pack includes a first insulating member, which is disposed between the battery cells along the first direction, and which extends beyond the battery cell housing along the second direction. A projection of the first insulating member overlaps a projection of the gap along the first direction.

6. The battery pack according to any one of claims 1 to 5, characterized in that: The first shell includes two second side walls that are oppositely arranged along a third direction. The first side wall is provided with two first recesses. At least a portion of the first insulating member is located between the two first recesses.

7. The battery pack according to claim 6, characterized in that: The battery pack includes two second shells. The first shell is provided with two first openings along the first direction. The two second shells close the two first openings. Both ends of the first connector are respectively connected to the two second shells.

8. The battery pack according to claim 6, characterized in that: The first side wall is provided with a first bending portion, and the first bending portion is arranged on a side of the second side wall away from the first space and connected to the second side wall.

9. The battery pack according to claim 8, characterized in that: The second side wall includes a second bent portion disposed between the first recessed portion and the first bent portion, and the second bent portion is connected to the first recessed portion.

10. The battery pack according to claim 9, characterized in that: The first bent portion is connected to the second side wall via a fastener, and the fastener can abut against a side surface of the second bent portion away from the first recess.

11. An electrical device, characterized in that: The battery pack comprises a battery pack as claimed in any one of claims 1 to 10, wherein the battery pack is used to provide electrical energy.

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