Battery pack and energy storage equipment

Abstract

The invention provides a battery pack and energy storage equipment, the battery pack comprises a shell, a first limiting piece, a battery cell unit group, a first component, a first wire harness, a top cover and a first fastening piece, the shell comprises a main body and a first convex part located in the main body, and the first convex part is fixed on the main body; the first limiting piece and the second limiting piece are arranged at intervals in the first direction. The battery cell unit group is positioned between the first limiting piece and the second limiting piece, and comprises a plurality of battery cell units arranged along the first direction; the first component is respectively fixed with the first limiting piece and the second limiting piece, the first component comprises a first accommodating groove, and the first convex part is positioned above the first accommodating groove; the first wire harness is connected to the battery cell unit group, and part of the first wire harness is positioned in the first accommodating groove; the top cover is connected to the shell; the first fastener fixes the first convex portion and the top cover.

Description

Technical Field

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

[0002] During the assembly process of the battery pack, the battery cells, wiring harnesses, etc. of the battery pack are prone to interfere with the casing or other components, which may cause damage to the battery cells and wiring harnesses, affecting the difficulty of assembling the battery pack and the safety of the finished battery pack. Summary of the invention

[0003] The present application provides a battery pack and an energy storage device to reduce the difficulty of assembling the battery pack.

[0004] In the first aspect, the present application provides a battery pack, which includes a shell, a first limiter, a battery cell group, a first component, a first wiring harness, a top cover and a first fastener, wherein the shell includes a main body and a first protrusion located in the main body, and the first protrusion is fixed to the main body; the first limiter and the second limiter are arranged at intervals along a first direction; the battery cell group is located between the first limiter and the second limiter, and the battery cell group includes a plurality of battery cell units arranged along the first direction; the first component is respectively fixed to the first limiter and the second limiter, the first component includes a first receiving groove, and the first protrusion is located above the first receiving groove; the first wiring harness is connected to the battery cell group, and part of the first wiring harness is located in the first receiving groove; the top cover is connected to the shell; and the first fastener fixes the first protrusion and the top cover.

[0005] The first limiter, the second limiter and the first component limit and fix the battery cell group, which is convenient for installing the battery cell group in the shell, and plays a role in protecting the battery cell group, reducing the possibility of the battery cell group interfering with the shell or other components during installation and being damaged, and plays a role in limiting the expansion of the battery cell in the first direction, which is beneficial to maintaining the internal circulation of the battery cell and extending the service life of the battery cell. The first protrusion guides the first component, which further facilitates the installation of the battery cell group, the first limiter, the second limiter and the first component in the shell. The first wiring harness located in the first receiving groove is less likely to interfere with the shell or other components, reducing the possibility of the first wiring harness interfering with the shell or other components and being damaged, which is beneficial to reducing the difficulty of assembling the battery pack and the safety of the finished battery pack.

[0006] In one or more optional embodiments above, the housing includes a first wall and a second wall arranged opposite to each other along the third direction, and a third wall and a fourth wall arranged opposite to each other along the second direction, the first protrusion is connected to the first wall and the third wall, and the first direction, the second direction, and the third direction are perpendicular to each other; the housing and the first protrusion are integrally formed. The connection strength between the housing and the first protrusion is improved, so that the first protrusion guides the battery cell group more stably.

[0007] In one or more of the above optional embodiments, the first wall, the third wall and the first protrusion are integrally formed.

[0008] In one or more of the above optional embodiments, the first wall, the second wall, the third wall, the fourth wall and the first protrusion are integrally formed.

[0009] In one or more of the above optional embodiments, the first component includes a first main body, a first extension portion connected to the first main body, and a first limiting portion connected to the first extension portion, the first main body is located between the first wall and the battery cell group, and the first extension portion is located between the third wall and the battery cell group; the first extension portion and the first limiting portion form a first receiving groove, and the first protrusion is located on the side of the first extension portion away from the battery cell group.

[0010] The first main body has a limiting effect on the battery cell group in the third direction, reduces the possibility of displacement of the battery cell in the third direction, and better fixes the battery cell group. The first extension has a limiting effect on the battery cell group in the second direction, reduces the possibility of displacement of the battery cell in the second direction, and better fixes the battery cell group. The first extension facilitates the fixation of the first wiring harness.

[0011] In one or more optional embodiments above, along the third direction, a first gap is formed between the first main body and the first wall, and the width W1 of the first gap satisfies 0<W1≤1.5mm; the first extension and the first convex portion are arranged along the second direction, and along the second direction, a second gap is formed between the first extension and the first convex portion, and the width W2 of the second gap satisfies 0<W2≤1.5mm. The possibility of friction between the first component and the housing causing resistance is reduced, so that the structure of the battery cell group, the first stopper, the second stopper and the first component can be installed in the housing.

[0012] In one or more optional embodiments above, the first protrusion extends from one end of the housing to the other end along the first direction. The first protrusion guides the first component, so that the structure of the battery cell group, the first limiter, the second limiter and the first component is more stable during the process of being installed in the housing.

[0013] In one or more optional embodiments above, the battery pack includes a second member, the second member is fixed to the first limiter and the second limiter respectively, and the second member and the first member are spaced apart along the third direction. The first limiter, the second limiter and the second member play a role in limiting the expansion of the battery cell unit in the first direction, which is beneficial to maintaining the internal circulation of the battery cell and extending the service life of the battery cell.

[0014] In one or more of the above optional embodiments, the shell includes a second protrusion located in the main body, the second component extends in one direction, the second component includes a second receiving groove, and the second protrusion is located below the second receiving groove. The battery pack includes a second wiring harness, the second wiring harness is connected to the battery cell unit group, and part of the second wiring harness is located in the second receiving groove. The second protrusion guides the second component, further facilitating the installation of the structure consisting of the battery cell unit group, the first limiter, the second limiter, the first component and the second component in the shell. The second wiring harness located in the second receiving groove is less likely to interfere with the shell or other components, reducing the possibility of the second wiring harness being damaged by interference with the shell or other components, which is beneficial to reducing the difficulty of assembling the battery pack and the safety of the finished battery pack.

[0015] In one or more optional embodiments above, the battery pack includes a third member, the third member is fixed to the first limiter and the second limiter respectively, and the first member and the third member are spaced apart along the second direction. The first limiter, the second limiter and the third member play a role in limiting the expansion of the battery cell unit in the first direction, which is beneficial to maintaining the internal circulation of the battery cell and extending the service life of the battery cell.

[0016] In one or more of the above optional embodiments, the shell includes a third protrusion located in the main body. The third component extends along the first direction, and the third component includes a third receiving groove, and the third protrusion is located above the third receiving groove. The battery pack includes a third wiring harness, and the third wiring harness is connected to the battery cell unit group, and part of the third wiring harness is located in the third receiving groove. The third protrusion guides the third component, and further facilitates the installation of the structure consisting of the battery cell unit group, the first limiter, the second limiter, the first component, the second component and the third component in the shell. The third wiring harness located in the third receiving groove is less likely to interfere with the shell or other components, thereby reducing the possibility of the third wiring harness being damaged by interference with the shell or other components, which is conducive to reducing the difficulty of assembling the battery pack and the safety of the finished battery pack.

[0017] In one or more optional embodiments above, the battery pack includes a fourth member, the fourth member is fixed to the first limiter and the second limiter respectively, the fourth member and the third member are spaced apart along the third direction, and the fourth member and the second member are spaced apart along the second direction. The first limiter, the second limiter and the fourth member play a role in limiting the expansion of the battery cell unit in the first direction, which is beneficial to maintaining the internal circulation of the battery cell and extending the service life of the battery cell.

[0018] In one or more of the above optional embodiments, the shell includes a fourth protrusion located in the main body. The fourth component extends along the first direction, the fourth component includes a fourth receiving groove, and the fourth protrusion is located below the fourth receiving groove. The battery pack includes a fourth wiring harness, the fourth wiring harness is connected to the battery cell unit group, and part of the fourth wiring harness is located in the fourth receiving groove. The fourth protrusion guides the fourth component, further facilitating the installation of the structure consisting of the battery cell unit group, the first limiter, the second limiter, the first component, the second component, the third component and the fourth component in the shell. The fourth wiring harness located in the fourth receiving groove is less likely to interfere with the shell or other components, reducing the possibility of the fourth wiring harness being damaged by interference with the shell or other components, which is beneficial to reducing the difficulty of assembling the battery pack and the safety of the finished battery pack.

[0019] In one or more optional embodiments above, the shell includes a first stopper, which is fixed to the first wall; the first component includes a first end connected to the first main body, which is fixed to the first limiter, and the first end is located between the first stopper and the first limiter, and abuts against the first stopper. The first stopper serves to stop and position the structure composed of the battery cell group, the first limiter, the second limiter, and the first component, thereby reducing the possibility of the battery cell group escaping from the shell, and making the position of the battery cell group in the shell more stable.

[0020] In one or more optional embodiments above, the shell includes a first opening, and the top cover covers the first opening; the battery pack includes a circuit board, and the first wiring harness passes through the first receiving groove and the first opening and is connected to the circuit board.

[0021] In one or more of the above optional embodiments, the first wiring harness includes a first wiring harness main body and multiple first wiring harness branches, part of the first wiring harness main body is located in the first receiving groove, and the first wiring harness main body is connected to the circuit board through the first opening; the first wiring harness branch includes a first collecting piece connected to the battery cell unit, the first wiring harness main body is configured to transmit parameters of the battery cell unit, and the first wiring harness branch is configured to collect and transmit parameters of the battery cell unit.

[0022] The wiring harness part of the first wiring harness branch is redundant and the wiring harness is relatively long. During the charging and discharging process, the battery cell will generate gas, causing the battery cell to expand. The first wiring harness branch moves with the expansion of the battery cell, while the first wiring harness main body is located in the first receiving groove and does not move with the expansion of the battery cell, reducing the possibility of damage to the first wiring harness main body due to excessive force, thereby reducing the possibility of short circuit of the first wiring harness main body, improving the safety of the battery pack, and the first wiring harness branch occupies a small space, and the difficulty of arranging and fixing the first wiring harness is relatively low.

[0023] In one or more optional embodiments above, the battery cell unit includes a battery cell, the battery cell includes a battery cell housing, an electrode assembly and two electrode terminals, and the electrode assembly is accommodated in the battery cell housing; in adjacent battery cells, one electrode terminal of each battery cell is connected to the same first collecting member. Adjacent battery cells are electrically connected through the first collecting member, which is conducive to simplifying the structure of the battery pack.

[0024] In one or more of the above optional embodiments, the first collecting member is a metal sheet for collecting voltage information of the battery cell.

[0025] In one or more optional embodiments above, the housing includes a second opening; the battery pack includes a bottom cover, the bottom cover covers the second opening; the battery pack includes a second fastener, the second fastener fixes the bottom cover and the first protrusion. The bottom cover protects the battery cell group, and the first protrusion also fixes the bottom cover, so that the housing and the bottom cover are firmly fixed, and it is beneficial to improve the space utilization of the battery pack.

[0026] In one or more of the above optional embodiments, at least one battery pack as described above is included. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can also be obtained based on these drawings.

[0028] Figure 1 A schematic diagram of the three-dimensional structure of a battery pack provided in some embodiments of the present application;

[0029] Figure 2 Schematic diagram of the explosion structure of the battery pack provided in some embodiments of the present application Figure 1 ;

[0030] Figure 3 Schematic diagram of the explosion structure of the battery pack provided in some embodiments of the present application Figure 2 ;

[0031] Figure 4 A schematic diagram of a three-dimensional structure of a first component of a battery pack provided in some embodiments of the present application;

[0032] Figure 5 A schematic cross-sectional view of a partial structure of a battery pack provided in some embodiments of the present application;

[0033] Figure 6 A three-dimensional schematic diagram of a partial structure of a battery pack provided in some embodiments of the present application;

[0034] Figure 7A schematic cross-sectional view of a partial structure of a battery pack provided in some embodiments of the present application;

[0035] Figure 8 A three-dimensional schematic diagram of a partial structure of a battery pack provided in some embodiments of the present application;

[0036] Fig. 9 A three-dimensional schematic diagram of a partial structure of a battery pack provided in some embodiments of the present application;

[0037] Fig.10 A schematic diagram of the three-dimensional structure of a battery cell unit of a battery pack provided in some embodiments of the present application.

[0038] Icons: 10-battery pack; 100-shell; 101-first opening; 102-second opening; 110-main body; 111-first wall; 112-second wall; 113-third wall; 114-fourth wall; 120-first convex portion; 130-second convex portion; 140-third convex portion; 150-fourth convex portion; 160-first stopper; 210-first limiter; 220-second limiter; 300-cell unit group; 310-cell unit; 311-cell; 3111-cell shell; 3112-electrode terminal; 410-first component; 410a-first receiving groove; 411-first main body; 412-first extension; 41 3-first limiting portion; 414-first end portion; 420-second component; 420a-second receiving groove; 430-third component; 430a-third receiving groove; 440-fourth component; 440a-fourth receiving groove; 510-first wiring harness; 511-first wiring harness body; 512-first wiring harness branch; 5121-first collecting piece; 520-second wiring harness; 530-third wiring harness; 540-fourth wiring harness; 610-top cover; 620-bottom cover; 710-first fastener; 720-second fastener; 810-first insulating member; 820-second insulating member; 900-circuit board; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0041] The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0042] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0043] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0044] With the development of the new energy industry, battery packs are gradually developing towards high energy density and high power density. The internal structure of the battery pack is more compact, and the spacing between the battery cells, wiring harnesses and other structures of the battery pack and the shell is smaller. As a result, during the assembly process of the battery pack, the battery cells, wiring harnesses and other structures of the battery pack are easily interfered with the shell or other components, thereby causing damage to the battery cells and wiring harnesses, affecting the difficulty of assembling the battery pack and the safety of the finished battery pack.

[0045] In order to reduce the difficulty of assembling a battery pack, the present application provides a battery pack, which includes a shell, a first limiter, a battery cell group, a first component, a first wiring harness, a top cover and a first fastener, wherein the shell includes a main body and a first protrusion located inside the main body, and the first protrusion is fixed to the main body; the first limiter and the second limiter are spaced apart along a first direction; the battery cell group is located between the first limiter and the second limiter, and the battery cell group includes a plurality of battery cell units arranged along the first direction; the first component is respectively fixed to the first limiter and the second limiter, the first component includes a first receiving groove, and the first protrusion is located above the first receiving groove; the first wiring harness is connected to the battery cell group, and part of the first wiring harness is located in the first receiving groove; the top cover is connected to the shell; and the first fastener fixes the first protrusion and the top cover.

[0046] In a battery pack of this structure, the first limiter, the second limiter and the first component limit and fix the battery cell group, which is convenient for installing the battery cell group in the shell, and plays a role in protecting the battery cell group, reducing the possibility of the battery cell group interfering with the shell or other components during installation and being damaged, and plays a role in limiting the expansion of the battery cell in the first direction, which is conducive to maintaining the internal circulation of the battery cell and extending the service life of the battery cell. The first protrusion of the shell guides the first component, which further facilitates the installation of the structure of the battery cell group, the first limiter, the second limiter and the first component in the shell. The first wiring harness located in the first receiving groove is less likely to interfere with the shell or other components, reducing the possibility of the first wiring harness interfering with the shell or other components and being damaged, which is conducive to reducing the difficulty of assembling the battery pack and the safety of the finished battery pack.

[0047] The battery cell in the battery pack provided in the embodiment of the present application can be a secondary battery or a primary battery, for example, a lithium ion battery, a sodium ion battery or a magnesium ion battery, etc., which is not limited in the embodiment of the present application. The battery cell can be cylindrical, flat, rectangular or other shapes, etc., which is not limited in the embodiment of the present application.

[0048] See also Figures 1 to 3 , Figure 1 A schematic diagram of the three-dimensional structure of a battery pack provided in some embodiments of the present application; Figure 2 Schematic diagram of the explosion structure of the battery pack provided in some embodiments of the present application Figure 1 ; Figure 3 Schematic diagram of the explosion structure of the battery pack provided in some embodiments of the present application Figure 2 .

[0049] Some embodiments of the present application provide a battery pack 10, including a first stopper 210 and a second stopper 220, a battery cell group 300, and a first component 410, wherein the first stopper 210 and the second stopper 220 are arranged at intervals along a first direction X. The battery cell group 300 is located between the first stopper 210 and the second stopper 220, and the battery cell group 300 includes a plurality of battery cells 310 arranged along the first direction X. The first component 410 is fixed to the first stopper 210 and the second stopper 220, respectively. The fixing methods include but are not limited to clamping, screw fixing, bonding, abutting, welding, etc.

[0050] In some embodiments, the first component 410 can be directly fixed to the first stopper 210 and the second stopper 220 respectively, so that the structure of the battery pack 10 is simpler, such as snap-fitting.

[0051] See also Figure 4 and Figure 5 , Figure 4A schematic diagram of a three-dimensional structure of a first component of a battery pack provided in some embodiments of the present application; Figure 5 A schematic cross-sectional view of a partial structure of a battery pack provided in some embodiments of the present application.

[0052] In some embodiments, the battery pack 10 includes a housing 100 and a first wiring harness 510, the housing 100 includes a main body 110 and a first protrusion 120 located in the main body 110, and the first protrusion 120 is fixed to the main body 110. The first protrusion 120 protrudes from the main body 110. The fixing method includes but is not limited to clamping, screw fixing, bonding, abutting, welding, integral molding, etc.

[0053] In some embodiments, the first member 410 includes a first receiving groove 410a, and the first protrusion 120 is located above the first receiving groove 410a (eg, Figure 5 The first wire harness 510 is connected to the battery cell unit group 300, and a portion of the first wire harness 510 is located in the first receiving groove 410a. The first protrusion 120 cooperates with the first component 410 to guide the battery cell unit group 300 to be installed into the housing 100 in the opposite direction of the first direction X.

[0054] The first stopper 210, the second stopper 220 and the first member 410 limit and fix the battery cell group 300, which is convenient for installing the battery cell group 300 in the housing 100, and plays a role in protecting the battery cell group 300, reducing the possibility of the battery cell group 300 interfering with the housing 100 or other components during installation and being damaged, and plays a role in limiting the expansion of the battery cell 310 in the first direction X, which is conducive to maintaining the internal circulation of the battery cell 311 and extending the service life of the battery cell 311. The first convex portion 120 guides the first member 410, further facilitating the installation of the structure of the battery cell group 300, the first stopper 210, the second stopper 220 and the first member 410 in the housing 100. The first wire harness 510 located in the first receiving groove 410a is less likely to interfere with the housing 100 or other components, reducing the possibility of the first wire harness 510 interfering with the housing 100 or other components and being damaged, which is conducive to reducing the difficulty of assembling the battery pack 10 and the safety of the finished battery pack 10.

[0055] In some embodiments, the battery pack 10 includes a top cover 610 and a first fastener 710 , the top cover 610 is connected to the shell 100 , and the first fastener 710 fixes the first protrusion 120 and the top cover 610 , so that the shell 100 and the top cover 610 are firmly fixed, and it is beneficial to improve the space utilization of the battery pack 10 .

[0056] The fixing method of the first fastener 710 includes but is not limited to clamping, screwing, bonding, etc. For example, the first fastener 710 is a screw.

[0057] In some embodiments, the first limit member 210, the second limit member 220, the first component 410, the shell 100, and the top cover 610 can be made of a relatively high-strength material, such as a metal material such as steel or aluminum alloy, so that the first limit member 210, the second limit member 220, the first component 410, the shell 100, and the top cover 610 have relatively high force-bearing performance, thereby making it less likely that the first limit member 210, the second limit member 220, the first component 410, the shell 100, and the top cover 610 will be deformed or damaged due to force or environmental changes, thereby making the battery pack 10 more reliable.

[0058] In other embodiments, the first stopper 210, the second stopper 220, the first component 410, the housing 100, and the top cover 610 may also be made of non-metallic materials with relatively high strength, such as carbon fiber and hard plastic.

[0059] See also Figure 5 In some embodiments, the housing 100 includes a first wall 111 and a second wall 112 arranged oppositely along a third direction Z, a third wall 113 and a fourth wall 114 arranged oppositely along a second direction Y, and the first convex portion 120 is connected to the first wall 111 and the third wall 113. The first convex portion 120 protrudes from the first wall 111 and the third wall 113. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The housing 100 and the first convex portion 120 are integrally formed. The connection strength between the housing 100 and the first convex portion 120 is improved, so that the first convex portion 120 guides the battery cell unit group 300 more stably. Among them, the integral forming method includes but is not limited to a perfusion process, an injection molding process, an aluminum casting process, and the like. For example, the first wall 111, the third wall 113, and the first convex portion 120 are integrally formed. For example, the first wall 111, the second wall 112, the third wall 113, the fourth wall 114, and the first convex portion 120 are integrally formed. The strength of the housing 100 and the protection effect on the battery cell unit group 300 are improved.

[0060] In other embodiments, the first wall 111 , the second wall 112 , the third wall 113 and the fourth wall 114 may also be fixedly connected by welding, bonding or the like.

[0061] See also Figure 4In some embodiments, the first member 410 includes a first main body 411, a first extension 412 connected to the first main body 411, and a first stopper 413 connected to the first extension 412. The first main body 411 is located between the first wall 111 and the battery cell group 300, and the first extension 412 is located between the third wall 113 and the battery cell group 300. The first extension 412 and the first stopper 413 form a first receiving groove 410a. The first convex portion 120 is located on a side of the first extension 412 away from the battery cell group 300. Along the second direction Y, the first convex portion 120 is located between the first extension 412 and the battery cell group 300.

[0062] The first main body 411 has a limiting effect on the battery cell unit group 300 in the third direction Z, reduces the possibility of displacement of the battery cell unit 310 in the third direction Z, and better fixes the battery cell unit group 300. The first extension 412 has a limiting effect on the battery cell unit group 300 in the second direction Y, reduces the possibility of displacement of the battery cell unit 310 in the second direction Y, and better fixes the battery cell unit group 300. The first extension 412 facilitates the fixation of the first wire harness 510.

[0063] In some embodiments, the first main body 411 abuts against the battery cell unit group 300 to further improve the limiting effect of the battery cell unit group 300 .

[0064] In some embodiments, the first extension portion 412 abuts against the battery cell group 300 to further improve the limiting effect of the battery cell group 300 .

[0065] In some other embodiments, along the second direction Y, a gap is formed between the first extension portion 412 and the battery cell unit group 300 , and the gap is less than 2 mm, which facilitates assembly.

[0066] In some embodiments, the first limiting portion 413 is bent away from the battery cell unit group 300, which is beneficial for fixing the first wire harness 510 during assembly and reducing interference between the first wire harness 510 and the battery cell unit group 300.

[0067] In some embodiments, along the third direction Z, a first gap is formed between the first main body 411 and the first wall 111, and the width W1 of the first gap satisfies 0<W1≤1.5mm. For example, W1 can be 0.1mm, 0.1mm, 0.1mm, 0.1mm or 1.5mm, etc. The possibility of friction between the first component 410 and the housing 100 generating resistance is reduced, so that the structure of the battery cell group 300, the first stopper 210, the second stopper 220 and the first component 410 can be installed in the housing 100.

[0068] In some embodiments, the first extension portion 412 and the first convex portion 120 are arranged along the second direction Y, and along the second direction Y, a second gap is formed between the first extension portion 412 and the first convex portion 120, and the width W2 of the second gap satisfies 0<W2≤1.5mm. For example, W2 can be 0.1mm, 0.1mm, 0.1mm, 0.1mm or 1.5mm, etc. The possibility of friction between the first component 410 and the housing 100 is reduced, so that the structure of the battery cell group 300, the first stopper 210, the second stopper 220 and the first component 410 is installed in the housing 100.

[0069] See also Figure 3 and Figure 6 , Figure 6 A three-dimensional schematic diagram of a partial structure of a battery pack provided in some embodiments of the present application.

[0070] In some embodiments, the battery pack 10 includes a first insulating plate 810, which is disposed between the first limiting portion 413 and the third wall 113. The first insulating plate 810 insulates the battery cell group 300 from the housing 100, thereby reducing the risk of short circuit in the battery pack 10.

[0071] See also Figure 3 and Figure 7 , Figure 7 A schematic cross-sectional view of a partial structure of a battery pack provided in some embodiments of the present application.

[0072] In some embodiments, the first protrusion 120 extends from one end to the other end of the housing 100 along the first direction X. The first protrusion 120 guides the first component 410, so that the structure of the battery cell group 300, the first stopper 210, the second stopper 220 and the first component 410 is more stable during the process of being installed in the housing 100.

[0073] See also Figure 3 In some embodiments, the battery pack 10 includes a second member 420, which is fixed to the first stopper 210 and the second stopper 220 respectively, and the second member 420 and the first member 410 are spaced apart along the third direction Z. The first stopper 210, the second stopper 220, and the second member 420 limit the expansion of the battery cell unit 310 in the first direction X, which is beneficial to maintain the internal circulation of the battery cell 311 and prolong the service life of the battery cell 311.

[0074] In some embodiments, the second component 420 can be made of a material with higher strength, such as metal materials such as steel, aluminum alloy, etc., so that the second component 420 has a higher force-bearing capacity, thereby reducing the possibility of deformation or damage of the second component 420 due to force or environmental changes, thereby making the battery pack 10 more reliable.

[0075] In other embodiments, the second component 420 may also be made of non-metallic materials with relatively high strength, such as carbon fiber, hard plastic, etc.

[0076] In some embodiments, the housing 100 includes a second protrusion 130 located in the main body 110. The second member 420 extends along the first direction X, and the second member 420 includes a second receiving groove 420a. The second protrusion 130 is located below the second receiving groove 420a (eg, Figure 5 ). The battery pack 10 includes a second wiring harness 520, which is connected to the battery cell group 300, and a portion of the second wiring harness 520 is located in the second receiving groove 420a. Along the second direction Y, the second protrusion 130 is located between the second member 420 and the battery cell group 300. The second wiring harness 520 is a power harness, for example, serving as the total positive electrode of the battery cell group 300.

[0077] The second protrusion 130 guides the second member 420, and further facilitates the installation of the structure composed of the battery cell group 300, the first stopper 210, the second stopper 220, the first member 410 and the second member 420 in the housing 100. The second wire harness 520 located in the second receiving groove 420a is less likely to interfere with the housing 100 or other components, reducing the possibility of the second wire harness 520 interfering with the housing 100 or other components and being damaged, which is conducive to reducing the difficulty of assembling the battery pack 10 and the safety of the finished battery pack 10.

[0078] In some embodiments, the second wire harness 520 serves as the positive electrode of the plurality of battery cells 310 . In other embodiments, the second wire harness 520 serves as the negative electrode of the plurality of battery cells 310 .

[0079] The structure of the second member 420 is similar to that of the first member 410 .

[0080] In some embodiments, the battery pack 10 includes a third member 430, and the third member 430 is fixed to the first stopper 210 and the second stopper 220 respectively, and the first member 410 and the third member 430 are arranged at intervals along the second direction Y. The first stopper 210, the second stopper 220 and the third member 430 play a role in limiting the expansion of the battery cell unit 310 in the first direction X, which is conducive to maintaining the internal circulation of the battery cell 311 and extending the service life of the battery cell 311.

[0081] In some embodiments, the housing 100 includes a third protrusion 140 located in the main body 110. The third member 430 extends along the first direction X, and the third member 430 includes a third receiving groove 430a. The third protrusion 140 is located above the third receiving groove 430a (eg, Figure 5 The battery pack 10 includes a third wire harness 530, which is connected to the battery cell group 300, and a portion of the third wire harness 530 is located in the third receiving groove 430a. Along the second direction Y, the third protrusion 140 is located between the third member 430 and the battery cell group 300. The third wire harness 530 is configured to collect and transmit parameters of the battery cell 310.

[0082] The third protrusion 140 guides the third member 430, and further facilitates the installation of the structure composed of the battery cell group 300, the first stopper 210, the second stopper 220, the first member 410, the second member 420 and the third member 430 in the housing 100. The third wire harness 530 located in the third receiving groove 430a is less likely to interfere with the housing 100 or other components, reducing the possibility of the third wire harness 530 interfering with the housing 100 or other components and being damaged, which is conducive to reducing the difficulty of assembling the battery pack 10 and the safety of the finished battery pack 10.

[0083] In some embodiments, the third wiring harness 530 is configured to collect and transmit parameters of the battery cell unit 310 .

[0084] The structure of the third member 430 is similar to that of the first member 410 .

[0085] In some embodiments, the battery pack 10 includes a second insulating plate 820 disposed between the third member 430 and the fourth wall 114. The second insulating plate 820 insulates the battery cell group 300 from the housing 100, thereby reducing the risk of short circuit in the battery pack 10.

[0086] In some embodiments, the battery pack 10 includes a fourth member 440, the fourth member 440 is fixed to the first stopper 210 and the second stopper 220 respectively, the fourth member 440 and the third member 430 are arranged at intervals along the third direction Z, and the fourth member 440 and the second member 420 are arranged at intervals along the second direction Y. The first stopper 210, the second stopper 220 and the fourth member 440 play a role in limiting the expansion of the battery cell unit 310 in the first direction X, which is conducive to maintaining the internal circulation of the battery cell 311 and extending the service life of the battery cell 311.

[0087] In some embodiments, the housing 100 includes a fourth protrusion 150 located in the main body 110. The fourth member 440 extends along the first direction X, and the fourth member 440 includes a fourth receiving groove 440a. The fourth protrusion 150 is located below the fourth receiving groove 440a (eg, Figure 5 ). The battery pack 10 includes a fourth wire harness 540, which is connected to the battery cell unit group 300, and a portion of the fourth wire harness 540 is located in the fourth receiving groove 440a. Along the second direction Y, the fourth protrusion 150 is located between the fourth member 440 and the battery cell unit group 300. The fourth wire harness 540 is a power wire harness.

[0088] The fourth protrusion 150 guides the fourth member 440, and further facilitates the installation of the structure consisting of the battery cell group 300, the first stopper 210, the second stopper 220, the first member 410, the second member 420, the third member 430 and the fourth member 440 in the housing 100. The fourth wire harness located in the fourth receiving groove 440a is less likely to interfere with the housing 100 or other components, reducing the possibility of the fourth wire harness interfering with the housing 100 or other components and being damaged, which is conducive to reducing the difficulty of assembling the battery pack 10 and the safety of the finished battery pack 10.

[0089] In some embodiments, the fourth wire harness serves as the negative electrode of the plurality of battery cells 310 . In other embodiments, the fourth wire harness serves as the positive electrode of the plurality of battery cells 310 .

[0090] The structure of the fourth member 440 is similar to that of the first member 410 .

[0091] In some embodiments, the housing 100 includes a second opening 102 , and the battery pack 10 includes a bottom cover 620 , which covers the second opening 102 , so that the top cover 610 and the bottom cover 620 play a role in protecting the battery cell group 300 .

[0092] In some embodiments, the battery pack 10 includes a second fastener 720, which fixes the bottom cover 620 and the first protrusion 120. The first protrusion 120 also plays a role of fixing with the bottom cover 620, so that the housing 100 and the bottom cover 620 are fixed firmly, and it is beneficial to improve the space utilization of the battery pack 10. The second fastener 720 includes but is not limited to screws, bolts, etc.

[0093] Among them, the fixing methods of the second fastener 720 include but are not limited to clamping, screwing, bonding, etc.

[0094] See also Figure 7 and Figure 8 , Figure 8 A three-dimensional schematic diagram of a partial structure of a battery pack provided in some embodiments of the present application.

[0095] In some embodiments, the housing 100 includes a first stopper 160, which is fixed to the first wall 111. When the structure composed of the battery cell group 300, the first stopper 210, the second stopper 220 and the first component 410 is loaded into the housing 100 from the second opening 102 and moved to one end of the housing 100 along the first direction X, the first stopper 160 stops and positions the structure composed of the battery cell group 300, the first stopper 210, the second stopper 220 and the first component 410, thereby reducing the possibility of the battery cell group 300 escaping from the housing 100 from the first opening 101, and making the position of the battery cell group 300 in the housing 100 more stable.

[0096] In some embodiments, the first stopper 160 is connected to the first protrusion 120 and the first wall 111. Optionally, the first stopper 160, the first protrusion 120 and the first wall 111 are integrally formed.

[0097] See also Figure 4 In some embodiments, the first member 410 includes a first end portion 414 connected to the first main body portion 411, the first end portion 414 is fixed to the first stopper 210, the first end portion 414 is located between the first stopper 160 and the first stopper 210, and abuts against the first stopper 160. The first stopper 160 acts on the first member 410, and the first member 410 extends along the first direction X to provide a supporting force in the first direction X.

[0098] See also Figure 3 In some embodiments, the housing 100 includes a first opening 101, and the top cover 610 covers the first opening 101. The battery pack 10 includes a circuit board 900, and the first wiring harness 510 passes through the first receiving groove 410a and the first opening 101 and is connected to the circuit board 900. The circuit board 900 is located on a side of the second stopper 220 away from the battery cell unit group 300.

[0099] In some embodiments, the circuit board 900 includes a BMS component that can control the charging and discharging of the battery cell group 300 .

[0100] See also Fig. 9 , Fig. 9 A three-dimensional schematic diagram of a partial structure of a battery pack provided in some embodiments of the present application.

[0101] In some embodiments, the first wire harness 510 includes a first wire harness body 511 and a plurality of first wire harness branches 512. Figure 6Part of the first wiring harness body 511 is located in the first receiving groove 410a, the first wiring harness body 511 is connected to the circuit board 900 through the first opening 101, the first wiring harness branch 512 includes a first collecting piece 5121 connected to the battery cell unit 310, the first wiring harness body 511 is configured to transmit parameters of the battery cell unit 310, and the first wiring harness branch 512 is configured to collect and transmit parameters of the battery cell unit 310.

[0102] The first wiring harness body 511 is formed by partially combining a plurality of wires, and the wires are separated from other wires at the corresponding battery cell units 310 to form the first wiring harness branches 512 .

[0103] The wiring harness portion of each first wiring harness branch 512 is redundant, and the wiring harness is relatively long. During the charging and discharging process, the battery cell 311 will generate gas, causing the battery cell 311 to expand. The first wiring harness branch 512 moves with the expansion of the battery cell 311, while part of the first wiring harness main body 511 is located in the first receiving groove 410a and does not move with the expansion of the battery cell 311, thereby reducing the possibility of the first wiring harness main body 511 being damaged due to excessive force, thereby reducing the possibility of the first wiring harness main body 511 short-circuiting, and improving the safety of the battery pack 10. In addition, the first wiring harness branch 512 occupies a small space, and the difficulty of arranging and fixing the first wiring harness 510 is relatively low.

[0104] See also Fig.10 , Fig.10 A schematic diagram of the three-dimensional structure of a battery cell unit of a battery pack provided in some embodiments of the present application.

[0105] In some embodiments, the battery cell unit 310 includes a battery cell 311, and the battery cell 311 includes a battery cell housing 3111, an electrode assembly, and two electrode terminals 3112, and the electrode assembly is accommodated in the battery cell housing 3111. In adjacent battery cells 311, one electrode terminal 3112 of each battery cell 311 is connected to the same first collecting member 5121. Adjacent battery cells 311 are electrically connected through the first collecting member 5121, which is conducive to simplifying the structure of the battery pack 10.

[0106] In some embodiments, the first collecting member 5121 may be a metal sheet for collecting voltage information of the battery cell 311 .

[0107] In other embodiments, the first collecting component 5121 may be a thermistor for collecting temperature information of the battery cell 311 .

[0108] In some embodiments, the electrode terminal 3112 is configured to deform and extend when the battery cell 311 expands, thereby reducing the risk of separation of the electrode terminal 3112 from the first collecting member 5121 , which is beneficial to improving the reliability of the battery pack 10 .

[0109] In some embodiments, the two electrode terminals 3112 are respectively disposed at two ends of the electrode assembly along the second direction Y, and the electrode terminal 3112 located at the same end as the first component 410 is connected to the first collecting member 5121 .

[0110] In other embodiments, the two electrode assemblies may be disposed at the same end of the electrode assembly along the second direction Y, wherein one of the electrode terminals 3112 is connected to the first collecting member 5121 .

[0111] In some embodiments, the battery cell unit 310 includes a battery cell 311 and a bracket fixed to the battery cell 311, and the first component 410 is connected to the bracket. The battery cell 311 is fixed to the first component 410 through the bracket, reducing the force on the battery cell 311, and the bracket protects the battery cell 311 and reduces the possibility of damage to the battery cell 311.

[0112] Optionally, the first component 410 may be connected to the brackets of some of the battery cell units 310 , or may be connected to the bracket of each battery cell unit 310 .

[0113] In some embodiments, "connection" should be understood in a broad sense, for example, it can be abutment, fixed connection, detachable connection, etc.; it can be direct connection or indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0114] In some embodiments, the bracket and the battery cell 311 are integrally formed. This improves the connection strength between the bracket and the battery cell 311. In particular, integrally formed means that the bracket and the battery cell 311 are directly fixed. The integrally formed method includes but is not limited to a perfusion process, an injection molding process, and the like.

[0115] In other embodiments, the connection method between the bracket and the battery cell 311 includes but is not limited to assembly, spraying, etc.

[0116] In some embodiments, each bracket is integrally formed with a battery cell 311 .

[0117] In other embodiments, each bracket may be integrally formed with a plurality of battery cells 311 to improve the manufacturing efficiency of the battery pack 10 .

[0118] See also Figure 3 In some embodiments, the first stopper 210 is configured to provide expansion space for the battery cell 310, and the battery cell 310 is configured to move between the first stopper 210 and the second stopper 220. This allows at least part of the expansion force of the battery cell 310 to be released, reducing the possibility of excessive pressure in the battery pack 10 caused by the accumulation of the expansion force of the battery cell 310, which is beneficial to improving the safety of the battery pack 10.

[0119] In some embodiments, the second stopper 220 is configured to provide expansion space for the battery cell 310, and the battery cell 310 is configured to move between the first stopper 210 and the second stopper 220. This allows at least part of the expansion force of the battery cell 310 to be released, reducing the possibility of excessive pressure in the battery pack 10 due to the accumulation of the expansion force of the battery cell 310, which is beneficial to improving the safety of the battery pack 10.

[0120] Some embodiments of the present application provide an energy storage device, and the energy storage device includes the battery pack 10 provided in any of the above embodiments.

[0121] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0122] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery pack, characterized in that: include: The housing comprises a main body and a first protrusion located in the main body, wherein the first protrusion is fixed to the main body; A first limiting member and a second limiting member are arranged at intervals along the first direction; A battery cell unit group, located between the first limiting member and the second limiting member, the battery cell unit group includes a plurality of battery cell units arranged along the first direction; A first component is fixed to the first limiting member and the second limiting member respectively, the first component comprises a first receiving groove, and the first convex portion is located above the first receiving groove; A first wiring harness connected to the battery cell unit group, wherein a portion of the first wiring harness is located in the first receiving groove; A top cover connected to the shell; A first fastener fixes the first protrusion and the top cover.

2. The battery pack according to claim 1, characterized in that: The housing comprises a first wall and a second wall arranged opposite to each other along a third direction, and a third wall and a fourth wall arranged opposite to each other along the second direction, the first protrusion is connected to the first wall and the third wall, and the first direction, the second direction and the third direction are perpendicular to each other; The housing and the first protruding portion are integrally formed.

3. The battery pack according to claim 2, characterized in that: The first component includes a first main body, a first extension connected to the first main body, and a first limiter connected to the first extension, the first main body is located between the first wall and the battery cell group, and the first extension is located between the third wall and the battery cell group; The first extending portion and the first limiting portion form the first receiving groove, and the first convex portion is located on a side of the first extending portion away from the battery cell unit group.

4. The battery pack according to claim 3, characterized in that: Along the third direction, a first gap is formed between the first main body and the first wall, and a width W1 of the first gap satisfies 0<W1≤1.5mm; The first extension portion and the first convex portion are arranged along the second direction, and a second gap is formed between the first extension portion and the first convex portion along the second direction, and a width W2 of the second gap satisfies 0<W2≤1.5 mm.

5. The battery pack according to claim 3 or 4, characterized in that: The housing includes a first stopper, and the first stopper is fixed to the first wall; The first component includes a first end portion connected to the first main body portion, the first end portion is fixed to the first limiting member, the first end portion is located between the first stopping member and the first limiting member, and abuts against the first stopping member.

6. The battery pack according to any one of claims 1 to 5, characterized in that: The housing comprises a first opening, and the top cover covers the first opening; The battery pack includes a circuit board, and the first wiring harness is connected to the circuit board after passing through the first receiving groove and the first opening.

7. The battery pack according to claim 6, characterized in that: The first wiring harness comprises a first wiring harness body and a plurality of first wiring harness branches, a portion of the first wiring harness body is located in the first receiving groove, and the first wiring harness body passes through the first opening and is connected to the circuit board; The first wiring harness branch includes a first acquisition member connected to the battery cell unit, the first wiring harness body is configured to transmit parameters of the battery cell unit, and the first wiring harness branch is configured to acquire and transmit parameters of the battery cell unit.

8. The battery pack according to claim 7, characterized in that: The battery cell unit comprises a battery cell, wherein the battery cell comprises a battery cell housing, an electrode assembly and two electrode terminals, and the electrode assembly is accommodated in the battery cell housing; In adjacent battery cells, one electrode terminal of each battery cell is connected to the same first collecting member.

9. The battery pack according to any one of claims 1 to 8, characterized in that: The housing includes a second opening; The battery pack includes a bottom cover, and the bottom cover covers the second opening; The battery pack includes a second fastener that fixes the bottom cover and the first protrusion.

10. An energy storage device, characterized in that: Comprising at least one battery pack according to any one of claims 1 to 9.

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