CN114883722A

CN114883722A - Battery pack and power utilization device

Info

Publication number: CN114883722A
Application number: CN202210311522.8A
Authority: CN
Inventors: 李�浩
Original assignee: Dongguan Poweramp Technology Ltd
Current assignee: Dongguan Poweramp Technology Ltd
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2022-08-09

Abstract

The application provides a group battery and power consumption device, wherein the group battery includes electric core module, first casing, second casing and first connecting piece, the first space of first casing can be arranged in to electric core module, the first lateral wall of first casing includes main part and first concave part, the first opening on the first casing of second casing closure, first connecting piece is connected in the first lateral wall of second casing and first casing, the structural strength of first lateral wall not only can be strengthened to first connecting piece, be favorable to reducing the thickness of first lateral wall, improve the energy density of group battery, can also transmit the effort that first lateral wall received to the second casing, the structural stability of first casing has been improved, be favorable to improving the security of group battery.

Description

Battery pack and power utilization device

Technical Field

The application relates to the technical field of batteries, in particular to a battery pack and an electric device.

Background

A rechargeable battery cell refers to a battery that can be used continuously by activating an active material by charging after the cell is discharged. Rechargeable electric cores are widely used in electronic devices, such as mobile phones, notebook computers, and the like.

A battery pack typically includes a plurality of battery cells to meet voltage requirements of electronic devices. In the development of battery technology, how to improve the safety of battery packs has been the research direction in the industry.

Disclosure of Invention

In view of the above problems, the present application provides a battery pack and an electric device, which are advantageous for improving the safety of the battery pack due to the structural stability of the battery pack.

In order to achieve the purpose, the following technical scheme is adopted in the application: in a first aspect, the present application provides a battery pack, which includes a battery cell module, a first casing, a second casing, and a first connecting member, wherein the battery cell module includes a plurality of battery cells, the first casing is provided with a first space and a first opening communicated with the first space, the first casing includes a first side wall, the first side wall includes a main body portion and a first concave portion, the second casing closes the first opening, the first concave portion is provided with the first connecting member, and the first connecting member connects the second casing and the first side wall.

Through above-mentioned technical scheme, the structural strength of first lateral wall not only can be strengthened to first connecting piece, is favorable to reducing the thickness of first lateral wall, improves the energy density of group battery, can also transmit the effort that first lateral wall received to the second casing, has improved the structural stability of first casing, is favorable to improving the security of group battery

In some embodiments, the battery pack includes a first insulating member, the plurality of battery cells are stacked in a first direction, and the first insulating member is disposed between the battery cells in the first direction, and is connected to the first concave portion, and the first insulating member 11 can support and protect the battery cells.

In some embodiments, the first recess comprises a first portion, a second portion and a third portion connected between the first portion and the second portion, the first portion being closer to the main body portion than the third portion, the first portion, the second portion and the third portion enclosing a groove on a side away from the first space.

In some embodiments, the first connecting piece is arranged in the groove, and the first connecting piece is connected with at least one of the first part, the second part and the third part, so that the first connecting piece can be positioned, the first connecting piece can be accommodated, and the possibility of collision between the first connecting piece 4 and an external device is effectively reduced.

In some embodiments, the cell includes an electrode assembly, a cell casing housing the electrode assembly, and an electrode terminal connected to the electrode assembly and leading out of the cell casing; along the second direction, be equipped with the clearance between electric core casing and the first portion, second direction perpendicular to first direction, the clearance makes electric core casing and first concave part leave, has reduced the impact that electric core received, further promotes the security of group battery.

In some embodiments, the battery pack includes a first insulating member, the first insulating member is disposed between the battery cells in the first direction, the first insulating member extends beyond the battery cell casing in the second direction, a projection of the first insulating member and a projection of the gap overlap in the first direction, a force applied to the battery cell can be transmitted to the first insulating member, movement of the battery cell module in the second direction is limited, and impact on the battery cell in the battery cell module is reduced.

In some embodiments, the first casing includes two second side walls oppositely arranged along the 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 cell module is positioned by clamping the first insulating member by the two first recesses.

In some embodiments, the battery pack includes two second housings, the first housing is provided with two first openings along the first direction, the two second housings close the two first openings, two ends of the first connecting member are respectively connected to the two second housings, the two second housings close the two first openings, so that the first space forms an independent cavity, the battery cell module located in the first space can be protected, the first connecting member is connected between the two second housings, so that the second housings can be clamped at two ends of the battery cell module, the battery cell module can be clamped and pressurized, and the improvement of the overall rigidity and strength of the battery cell module is facilitated.

In some embodiments, the first side wall is provided with a first bending portion, and the first bending portion is disposed 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 an inner side of the first side wall close to the first space through the first bending portion.

In some embodiments, the second side wall includes a second bending portion disposed between the first concave portion and the first bending portion, and the second bending portion is connected to the first concave portion, so as to enhance the structural strength of the first concave portion and reduce the influence of the second bending portion on the cell module 1 and the first concave portion 21.

In some embodiments, the first bending portion is connected to the second side wall through the fastening piece, and the fastening piece can be abutted against the side face, far away from the first concave portion, of the second bending portion, so that not only is the rigidity of the joint of the first side wall and the second side wall increased, but also the first connecting piece can be supported through the first concave portion, the integral strength and rigidity of the first shell can be increased, the thickness of the first shell can be reduced, and the energy density of the battery pack can be improved.

In some embodiments, a second accommodating cavity is formed in the second casing, the second accommodating cavity is communicated with the first space, a fire probe containing fire extinguishing gas is arranged in the second accommodating cavity, and when the battery cell module is out of thermal runaway, fire extinguishing aerosol in the fire probe can enter the first space from the second accommodating cavity to cool or extinguish the battery cell module, so that the safety of the battery pack is improved.

In some embodiments, the second shell includes an end plate and a cover plate, the side of the end plate close to the first space is provided with a barrier, the cover plate is covered on the barrier, and the end plate, the barrier and the cover plate define a second cavity; enclose to keep off and be equipped with the intercommunicating pore, the intercommunicating pore holds second chamber and first space intercommunication for the fire extinguishing aerosol in the fire probe can get into in the first space from the intercommunicating pore.

In some embodiments, the battery pack further includes a first bus bar and a second bus bar connected to the tabs of the battery cells, at least one of the first bus bar and the second bus bar is provided with a support member, and at least one of the first bus bar and the second bus bar is supported by the first casing through the support member, so that at least one of the first bus bar and the second bus bar is supported by the support member and positioned on the battery module.

The application also provides an electric device, and the electric device has higher security.

In a second aspect, the present application provides an electric device, which includes the battery pack provided in any one of the above technical solutions, wherein the battery pack is used for providing electric energy.

The technical scheme provided by the embodiment of the disclosure at least brings the following beneficial effects:

the application provides a battery pack, this battery pack includes electric core module, first casing, second casing and first connecting piece, electric core module can arrange in the first space of first casing, the first lateral wall of first casing includes main part and first concave part, the first opening on the second casing seals the first casing, first connecting piece is connected in the first lateral wall of second casing and first casing, the structural strength of first lateral wall not only can be strengthened to first connecting piece, be favorable to reducing the thickness of first lateral wall, improve the energy density of battery pack, can also transmit the effort that first lateral wall received to the second casing, the structural stability of first casing has been improved, be favorable to improving the security of battery pack.

The application also provides an electric device, which comprises the battery pack provided by the technical scheme, and the electric device has higher safety.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a disassembled view of a battery pack provided in some embodiments of the present application;

fig. 2 is a partial schematic view of a cell module and a first casing according to some embodiments of the present disclosure;

FIG. 3 is a schematic illustration of a connection between a first housing and a first connector according to some embodiments of the present disclosure;

FIG. 4 is an enlarged schematic view at A in FIG. 3;

fig. 5 is a schematic structural diagram of a portion of a cell module provided in some embodiments of the present application;

fig. 6 is a schematic structural diagram of a cell provided in some embodiments of the present application;

fig. 7 is a schematic connection diagram of a cell module and a first casing according to some embodiments of the present disclosure;

fig. 8 is a schematic diagram illustrating a position of a battery cell and a first concave portion according to some embodiments of the present disclosure;

FIG. 9 is a disassembled view of a first housing provided by some embodiments of the present application;

FIG. 10 is an exploded view of a second housing provided in accordance with some embodiments of the present application;

FIG. 11 is a schematic view of a second housing with a cover removed according to some embodiments of the present disclosure;

fig. 12 is a schematic connection diagram of a cell module and a connection bar according to some embodiments of the present disclosure;

fig. 13 is a schematic diagram of an electrical device provided in some embodiments of the present application.

In the figure: 1. a battery cell module; 11. a first insulating member; 12. an electric core; 121. a cell shell; 122. an electrode terminal; 123. a gap; 2. a first housing; 20. a main body portion; 21. a first recess; 211. a first portion; 212. a second portion; 213. a third portion; 23. a first side wall; 231. a first bent portion; 24. a second side wall; 241. a second bent portion; 25. a fastener; 26. a first space; 3. a second housing; 30. a second cavity; 31. an end plate; 311. fencing; 3111. a communicating hole; 32. a cover plate; 4. a first connecting member; 5. a first bus bar; 6. a second bus bar; 7. a support member; 8. a fire-detecting pipe.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

It should be noted that technical terms or scientific terms used in the embodiments of the present application should be understood as having a common meaning as understood by those skilled in the art to which the embodiments of the present application belong, unless otherwise specified.

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships that are based on the orientations or positional relationships shown in the drawings, merely for convenience of description and simplified description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the embodiments of the present application.

Furthermore, the technical terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, a first feature "on" or "under" a second feature may be directly contacting the first and second features, or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

At present, the application of the battery pack is more and more extensive in view of the development of market situation. The battery pack is not only applied to energy storage power supply systems of hydraulic power, firepower, wind power, solar power stations and the like, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as communication equipment, military equipment, aerospace and the like. As the field of application of battery packs is continuously expanded, the market demand thereof is also continuously expanded.

The technical scheme of the battery pack and the electric device provided by the present application is further described below by the specific embodiments.

Referring to fig. 1, some embodiments of the present disclosure provide a battery pack, where the battery pack includes a battery cell module 1, a first casing 2, a second casing 3, and a first connecting member 4, a first space 26 is formed in the first casing 2, the battery cell module 1 is accommodated in the first space 26 of the first casing 2, the second casing 3 covers an opening of the first space 26, and the first connecting member 4 is disposed on the first casing 2 and connected to the second casing 3, so as to enhance structural strength of the first casing 2, enhance protection of the battery cell module 1, enable an acting force applied to the first casing 2 to be transmitted to the second casing 3 through the first connecting member 4, enhance connection between the first casing 2 and the second casing 3, enhance overall structural strength of the first casing 2 and the second casing 3, and enhance protection of the battery pack.

In some embodiments of the present application, as shown in fig. 2 and 3, the first casing 2 includes a first side wall 23, the first side wall 23 includes a main body portion 20 and a first concave portion 21, the first concave portion 21 protrudes toward a side close to the cell module 1 relative to the main body portion 20, the first casing 2 is provided with a first opening communicated with the first space 26, and the second casing 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.

First connecting piece 4 sets up in first concave part 21, and first connecting piece 4 not only can strengthen the structural strength of first lateral wall 23, is favorable to reducing the thickness of first lateral wall 23, improves the energy density of group battery, can also improve the structural stability of first casing 2 with the effort transmission that first concave part 21 received to second casing 3, is favorable to improving the security of group battery.

As shown in fig. 4, the first recess 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 with respect to the main body portion 20, and the third portion 213 is connected between the first portion 211 and the second portion 212 such that the first recess 21 protrudes from the main body portion 20. The first portion 211 is close to the main body portion 20 relative to the third portion 213, and the first portion 211, the second portion 212 and the third portion 213 enclose a groove on a side away from the first space 26.

As shown in fig. 4, in some embodiments, the depth of the groove in the third direction is greater than or equal to the thickness of the first connecting piece 4, so that the first connecting piece 4 can be completely placed in the groove in the thickness direction, and the possibility of collision between the first connecting piece 4 and an external device can be effectively reduced.

In some embodiments of the present application, the connection of the outer surface of the first connecting element 4 to at least one of the first portion 211, the second portion 212 and the third portion 213 facilitates the transmission of the force received by the first recess 21 to the first connecting element 4. In some embodiments, the outer surface of the first connecting element 4 is connected to the surface of the first portion 211 close to the groove, in some embodiments, the outer surface of the first connecting element 4 is connected to the surface of the second portion 212 close to the groove, in some embodiments, the outer surface of the first connecting element 4 is connected to the surface of the third portion 213 close to the groove, and the first connecting element 4 is clamped among the first portion 211, the second portion 212 and the third portion 213, so that the first connecting element 4 is firmly positioned in the groove of the first concave portion 21 and is not easy to fall off. The connections herein may be direct contact connections; or can be connected through other structural components, such as glue, connecting bolts and the like; but also by other compressible structural members such as foam, resilient pads with adhesive capability, etc. Specifically, the first portion 211, the second portion 212, and the third portion 213 are formed by bending on the first side wall 23, so that the processing of the first concave portion 21 is facilitated.

In some embodiments, the cross-sectional shape of the groove is square, the cross-sectional shape of the first connecting member 4 is square, and four corners of the first connecting member 4 are provided with chamfers, so that the first connecting member 4 can be conveniently installed in the groove. First connecting piece 4 adopts 6063 aluminum alloy to make for first connecting piece 4 has better intensity and rigidity, further promotes the protection to electric core module 1. .

In some embodiments of the present application, as shown in fig. 5, the cell module 1 includes a plurality of cells 12, and as shown in fig. 6, each cell 12 includes an electrode assembly (not shown), a cell casing 121, and an electrode terminal 122 connected to the electrode assembly and led out from the cell casing 121. The electrode assembly includes a winding type or lamination stack formed by winding a positive electrode tab, a negative electrode tab, and a separator. The positive pole piece comprises a positive current collector and a positive active substance layer, and the positive active substance layer is coated on the surface of the positive current collector. Taking a cell of a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The negative pole piece includes negative current collector and negative active material layer, and the negative active material layer coats in the surface of negative current collector. The material of the negative electrode current collector may be copper, the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material may be carbon, silicon, or the like. The material of the isolation film may be PP (polypropylene) or PE (polyethylene). The material of the cell casing 121 may also include various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, and the like. Optionally, the battery cell 12 further includes a soft package battery cell. Optionally, the cell casing 121 includes an aluminum plastic film.

In some embodiments, as shown in fig. 5, the cell module 1 includes first insulating members 11, and the first insulating members 11 and the cells 12 are stacked in a first direction, and the first insulating members 11 are disposed between the cells 12 in the first direction. The battery cell 12 is connected to a side surface of the first insulating member 11, the side surface of the battery cell 12 is completely covered by the first insulating member 11, and the first insulating member 11 can support and protect the battery cell 12. In some embodiments of the present application, a surface of the first insulating member 11 includes an insulating material, so that the first insulating member 11 has an insulating ability. Alternatively, the first insulating member 11 may be formed of a composite material, such as by coating a surface of a metal material with an insulating material. Optionally, first insulating part 11 is made by the bubble cotton, and the cotton material of bubble is softer, not only can play the guard action to electric core 12, can also absorb electric core 12's inflation to a certain extent, provides the inflation space for electric core 12.

In some embodiments, the first insulator 11 is a microcellular foamed polypropylene foam having a shore hardness value of greater than 60 as measured by a shore durometer C durometer, which may range in thickness from 8mm or more. Optionally, the bubble is cotton to be equipped with fireproof heat insulation performance, the cotton coefficient of heat conductivity of bubble is less than 0.03, and reach fire-retardant V0's requirement, carry out twice 10 seconds's burning test back to the sample, flame extinguishes in 30 seconds, can not have the comburent to fall down, and require to utilize acetylene flame to carry out 10 minutes to the sample and strike the sample and do not burn through, first insulating part 11 can play isolated effect when electric core module 1 takes place thermal runaway, be favorable to preventing thermal runaway's stretching.

Further, in the first direction, the battery cells 12 are sandwiched between two adjacent first insulating members 11. The cell 12 is connected to the first insulating member 11 by a double-sided tape, so that the first insulating member 11 and the cell 12 are connected as a whole. The battery cell 12 may also be connected to the first insulating member 11 by an adhesive substance such as glue, and a person skilled in the art may select a connection structure between the battery cell 12 and the first insulating member 11 according to practical situations. In some embodiments, two, three, four or more cells 12 may be connected to the first insulating member 11 after being connected as an integrated body, which is beneficial to reducing the number of the used first insulating members 11, improving the proportion of the cells 12 in the cell module 1, and improving the energy density of the battery pack.

In some embodiments of the present application, a gap 123 is disposed between the cell casing 121 and the first portion 211 along the second direction, and the second direction is perpendicular to the first direction, where the gap 123 separates the cell casing 121 from the first concave portion 21, so as to reduce an impact on the battery cell 12, and further improve the safety of the battery pack. The first insulating member 11 is disposed between the cells 12 in the first direction, and the first insulating member 11 extends beyond the cell casing 121 in the second direction, and a projection of the first insulating member 11 and a projection of the gap 123 overlap in the first direction. Along first direction, the length of first insulating part 11 is greater than the length of electricity core casing 121, and when first insulating part 11 supported and held in first concave part 21, electricity core 12 was spacing, and electricity core casing 121 can not be used with first concave part 21, has reduced the impact that electricity core 12 received, has further guaranteed the security of this group battery. The first insulating member 11 abuts against the surface of the first portion 211, so that the battery cell 12 is limited in the first space 26. The first insulating member 11 and the first concave portion 21 are abutted, but the first insulating member 11 and the first concave portion 21 are in contact, and mutual acting force exists between the first insulating member 11 and the first concave portion 21, and the first concave portion 21 can limit the position of the first insulating member 11 through abutting. When the group battery receives the impact, first insulating part 11 of electric core module 1 can support and hold in first concave part 21, has restricted electric core module 1's removal to restricted electric core 12's displacement, reduced the impact that electric core 12 received, realized the protection to electric core 12, be favorable to improving the security of group battery.

As shown in fig. 3, the first side wall 23 is provided with two first recesses 21 spaced apart from each other in 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, and the cell module 1 is clamped and positioned by the first insulating member 11 through the two first recesses 21.

Receive the vibration or under the circumstances such as impact when the group battery transports, on the second direction, the power transmission that electric core 12 received to first insulating part 11, first insulating part 11 can restrict the removal of electric core module 1 in the second direction, reduces electric core 12 in the electric core module 1 and receives the impact. The first recess 21 is connected to the first connecting member 4, and the first recess 21 transmits the acting force to the first connecting member 4 and further to the second housing 3, which is beneficial to reducing the possibility of deformation of the first side wall 23.

As shown in fig. 3 and 9, the first casing 2 includes two first sidewalls 23 disposed oppositely along the third direction and two second sidewalls 24 disposed oppositely along the second direction, the two first sidewalls 23 are disposed in parallel and at an interval, the two second sidewalls 24 are disposed in parallel and at an interval, and each first sidewall 23 is connected between the two second sidewalls 24 to form a first space 26 for accommodating the cell module 1.

In some embodiments, the first sidewall 23 has a first bending portion 231, the first bending portion 231 is disposed on a side of the second sidewall 24 away from the first space 26 and connected to the second sidewall 24, and the two second sidewalls 24 are respectively connected to inner sides of the first sidewall 23 close to the first space 26.

The second side wall 24 is provided with a second bending portion 241, the second bending portion 241 is disposed between the first concave portion 21 and the first bending portion 231, and the second bending portion 241 is connected to the side surface of the first concave portion 21 away from the first insulating member 11, so as to enhance the structural strength of the first concave portion 21 and reduce the influence of the second bending portion 241 on the contact between the battery cell module 1 and the first concave portion 21. Here, the connection may be a direct contact connection; or can be connected through other structural components, such as glue, connecting bolts and the like; but also by other compressible structural members such as foam, resilient pads with adhesive capability, etc. The second bending portion 241 abuts against the side surface of the second portion 212 connected to the first recess 21 away from the first recess, so that the first sidewall 23 and the second sidewall 24 are convenient to assemble. The abutting may be that the second bending portion 241 directly contacts the second portion 212, and a certain force is applied between the two. Further, the second side wall 24 is provided with a reinforcing rib, and the reinforcing rib can be formed on the second side wall 24 through a stamping process, which is beneficial to improving the rigidity of the second side wall 24.

In some embodiments of the present application, the first bending portion 231 is connected to the second sidewall 24 by a fastening member 25, and the fastening member 25 can abut against a side of the second bending portion 241 away from the first concave portion 21. The fastening member 25 may be a connecting bolt, the connecting bolt is connected to the second side wall 24, and a stud of the connecting bolt abuts against a side surface of the second bending portion 241 far away from the first concave portion 21, so that the first concave portion 21, the first bending portion 231, the second side wall 24 and the second bending portion 241 are mutually supported, not only is the rigidity of the connection position of the first side wall 23 and the second side wall 24 increased, but also the first connecting member 4 can be supported by the first concave portion 21, which is beneficial to increasing the overall strength and rigidity of the first housing 2, and is further beneficial to reducing the thickness of the first housing 2 and improving the energy density of the battery pack.

In some embodiments, the first side wall 23 and the second side wall 24 are made of hot-dip galvanized steel sheets, have good strength and corrosion resistance, and can protect the cell module 1 well.

As shown in fig. 1, the number of the second shells 3 is two, the first shell 2 is provided with two first openings along the first direction, and the two second shells 3 are respectively covered at the first openings at the two ends of the first space 26, so that the first space 26 forms an independent cavity, and the battery cell module 1 located therein can be protected. Two second casings 3 centre gripping respectively in the both ends of electric core module 1, and the both ends of first connecting piece 4 are connected respectively in two second casings 3, and under the effect of first connecting piece 4, second casing 3 can centre gripping in the both ends of electric core module 1, can carry out the centre gripping pressurization to electric core module 1, is favorable to improving the bulk rigidity and the intensity of electric core module 1, is favorable to promoting electric core 12 performance and safety.

The two ends of the first connecting piece 4 are connected to the two second shells 3 through fasteners respectively, and an operator can lock the connection between the first connecting piece 4 and the second shells 3 through the fasteners according to actual conditions in the use process of the battery pack, so that the firm connection between the first connecting piece 4 and the second shells 3 is improved. The fastener can be bolt assembly, sets up threaded hole on first connecting piece 4, and first connecting piece 4 and second casing 3 pass through bolt assembly locking connection for not only conveniently dismantle between first connecting piece 4 and the second casing 3, still be convenient for fasten.

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

Be formed with the second in the second casing 3 and hold chamber 30, second holds chamber 30 and first space 26 intercommunication, is equipped with the fire probe that contains the gaseous of putting out a fire in the second holds chamber 30, and when electric core module 1 took place thermal runaway, the aerosol of putting out a fire in the fire probe can be followed the second and held chamber 30 and get into first space 26 and cool down or put out a fire electric core module 1, has improved the security of this group battery.

In some embodiments, as shown in fig. 10, the second housing 3 includes an end plate 31 and a cover plate 32, a side of the end plate 31 close to the first space 26 is provided with an enclosure 311, and the cover plate 32 is covered on the enclosure 311, as shown in fig. 11, the end plate 31, the enclosure 311 and the cover plate 32 enclose a second cavity 30; the enclosure 311 is provided with a communication hole 3111, the communication hole 3111 connects the second cavity 30 and the first space 26, so that the fire extinguishing aerosol in the fire detecting pipe can enter the first space 26 from the communication hole 3111. The communication holes 3111 on the enclosure 311 are uniformly arranged at equal intervals, so that fire extinguishing aerosol in the fire probe can be uniformly discharged into the first space 26.

As shown in fig. 12, the battery pack further includes a first bus bar 5 and a second bus bar 6 connected to the tabs 122 of the battery cells 12, at least one of the first bus bar 5 and the second bus bar 6 is provided with a support 7, and at least one of the first bus bar 5 and the second bus bar 6 is abutted to the first housing 2 through the support 7, so that at least one of the first bus bar 5 and the second bus bar 6 is abutted to the battery module by the support 7. Support pieces 7 are arranged on the first bus bar 5 and the second bus bar 6, the support pieces 7 are clamped between the cell module 1 and the second side wall 24, and the support pieces 7 support the first bus bar 5 and the second bus bar 6 to support and position the first bus bar 5 and the second bus bar 6 on the cell module 1. Specifically, support member 7 adopts the cotton system of bubble, and the cotton material of bubble is softer, can play the guard action to electric core 12, still has good insulating nature. Alternatively, the material of the first bus bar 5 may include copper. Alternatively, the material of the second bus bar 6 may include copper.

Some embodiments of the present application further provide an electric device, which includes the battery pack provided in the above technical solution, where the battery pack is used to provide electric energy for the electric device.

As shown in fig. 13, the present embodiment provides an electric device 3000 using a battery pack 2000 as a power source, and the electric device 3000 may be an energy storage device, an uninterruptible power supply, an electric vehicle, a mobile phone, a portable device, a notebook computer, an electric toy, an electric tool, and the like. Power tools include metal cutting power tools, cleaning tools, and the like, such as electric drills, electric wrenches, vacuum cleaners, sweeping robots, and the like. The embodiment of the present application does not specifically limit the power consumption device 3000.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. A battery pack, comprising:

the battery cell module comprises a plurality of battery cells;

a first housing provided with a first space and a first opening communicating with the first space, the first housing including a first side wall including a main body portion and a first recess portion,

a second housing that closes the first opening;

and the first connecting piece is arranged in the first concave part and is connected with the second shell and the first side wall.

2. The battery pack of claim 1, wherein the battery pack comprises a first insulating member, wherein the plurality of cells are stacked in a first direction, and wherein the first insulating member is disposed between the cells in the first direction, and wherein the first insulating member is connected to the first recess.

3. The battery pack according to claim 2, wherein the first recess includes a first portion, a second portion, and a third portion connected between the first portion and the second portion, the first portion is closer to the main body portion than the third portion, and the first portion, the second portion, and the third portion enclose a groove on a side away from the first space.

4. The battery pack of claim 3, wherein said first connector is disposed in said recess, said first connector being coupled to at least one of said first portion, said second portion, and said third portion.

5. The battery pack of claim 3, wherein the cell comprises an electrode assembly, a cell casing housing the electrode assembly, and an electrode terminal connected to the electrode assembly and leading from the cell casing;

along a second direction, a gap is arranged between the cell shell and the first portion, and the second direction is perpendicular to the first direction.

6. The battery pack of claim 5, comprising a first insulator disposed between the cells in the first direction, the first insulator extending beyond the cell casing in the second direction, a projection of the first insulator and a projection of the gap overlapping in the first direction.

7. The battery according to any of claims 2-6, wherein the first housing comprises two second side walls oppositely disposed along the third direction, the first side walls are provided with two first recesses, and at least a portion of the first insulating member is located between the two first recesses.

8. The battery pack according to claim 7, wherein the battery pack includes two second cases, the first case is provided with two first openings in the first direction, the two second cases close the two first openings, and both ends of the first connecting member are connected to the two second cases, respectively.

9. The battery pack according to claim 7, wherein the first side wall is provided with a first bent portion, and the first bent portion is disposed on a side of the second side wall away from the first space and connected to the second side wall.

10. The battery pack according to claim 9, wherein the second side wall comprises a second bent part disposed between the first recess and the first bent part, and the second bent part is connected to the first recess.

11. The battery pack according to claim 10, wherein the first bending portion is connected to the second side wall by a fastening member, and the fastening member can abut against a side surface of the second bending portion away from the first recess.

12. An electric device comprising a battery as claimed in any one of claims 1 to 11 for providing electric energy.