Battery packs and electrical equipment

Abstract

The embodiment of the present application provides a battery pack and an electrical device, the battery pack including a shell, a cell module, an insulating layer and a first structural member. The shell includes a first space, the cell module is placed in the first space, the cell module includes a plurality of cells stacked along a first direction, a gap is formed between the cell module and the shell, the cell includes an electrode assembly, a cell shell, and an electrode terminal connected to the electrode assembly and led out from the cell shell; the insulating layer is formed by injecting an insulating material into the first space and solidifying it; along the first direction, the first structural member is arranged between the electrode terminals, the first structural member includes a recess, the recess is formed with a groove, the groove is connected to the gap, and the insulating layer is arranged in the recess and the gap. When the insulating material is injected into the first space, the insulating material flows along the first flow channel formed by the recess, which accelerates the flow speed of the insulating material and shortens the flow time of the insulating material in the battery pack shell.

Description

Technical Field

[0001] The present application relates to the technical field of electrochemical devices, and in particular to a battery pack and electrical equipment. Background Art

[0002] An existing battery pack, such as a soft-pack lithium battery, includes a housing (e.g., an aluminum-plastic foil housing, an aluminum-plastic composite film housing, etc.) and a cell module encapsulated within the housing. After the cell module is encapsulated within the housing, insulating material, such as potting compound or resin material, is often injected into the housing through a through-hole in the housing. This allows the insulating material to wrap around the cell module and fill the gap between the cell module and the housing, thereby securing the cell module and reducing damage to the housing of the soft-pack lithium battery. Since the insulating material takes a long time to flow, it is necessary to further reduce the time it takes for the insulating material to flow. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide a battery pack and electrical equipment to reduce the flow time of insulating material in the battery pack housing. The specific technical solution is as follows:

[0004] One aspect of an embodiment of the present application provides a battery pack, which includes a shell and a battery cell module, the shell forming a first space, the battery cell module being placed in the first space, the battery cell module including a plurality of battery cells stacked along a first direction, a gap being formed between the battery cell module and the shell, the battery cell including an electrode assembly, a battery cell shell, and an electrode terminal connected to the electrode assembly and extending from the battery cell shell, the battery pack also including: an insulating layer and a first structural member, the insulating layer being formed by injecting an insulating material into the first space and curing it; along the first direction, the first structural member being arranged between the electrode terminals, the first structural member including a recess, the recess being formed with a groove, the groove being connected to the first gap, and the insulating layer being arranged in the recess and the gap.

[0005] According to the battery pack provided in an embodiment of the present application, the first structural member includes a recessed portion, and the recessed portion is formed with a groove communicating with the gap, and an insulating layer is provided in the gap and the recessed portion. The battery pack may include multiple first structural members, and the multiple recessed portions on the multiple first structural members together form a first flow channel, the first flow channel extending along a first direction, and the first flow channel communicating with the gap. Based on this, when insulating material is injected into the first space, the insulating material will flow into the recessed portion and the gap, and flow along the first flow channel formed by the recessed portion, thereby accelerating the flow speed of the insulating material and shortening the flow time of the insulating material in the battery pack housing.

[0006] In some embodiments, the battery cell housing includes a first component for accommodating the electrode assembly and a second component extending outward from the first component, the electrode terminal extends out of the battery cell housing from the second component, and along the first direction, the first structural member is arranged between the second components of two adjacent battery cells.

[0007] In some embodiments, along the first direction, the insulating layer includes a first insulating layer, the first insulating layer is located between the second components of two adjacent battery cells, and the first insulating layer is bonded to the second components of the two adjacent battery cells.

[0008] In some embodiments, the housing includes a third wall and a fourth wall disposed opposite each other along a third direction. Along the third direction, the insulating layer includes a second insulating layer located between the third wall and the battery cell module, and the first insulating layer and the second insulating layer are bonded together. The insulating material flows through the second gap between the third wall and the battery cell module and forms the second insulating layer after curing, further accelerating the flow of the insulating material within the housing.

[0009] In some embodiments, along the first direction, the second components of the two adjacent battery cells are connected through the first insulating layer.

[0010] In some embodiments, the housing includes a first wall and a second wall disposed opposite each other along a second direction, the first wall having a first through hole, and a projection of the first through hole and a projection of the first insulating layer at least partially overlapping along the second direction. The insulating material is injected into the first space through the first through hole.

[0011] In some embodiments, the battery pack further includes a second structural member, which is located between the first wall and the first component along the second direction, and a second through hole is provided on the second structural member. Along the second direction, the projection of the first through hole, the projection of the second through hole, and the projection of the first insulating layer at least partially overlap.

[0012] In some embodiments, the second structural member includes a circuit board.

[0013] In some embodiments, the first wall includes a first partition wall and a second partition wall that are detachably connected, the first partition wall and the third wall are integrally formed, the second partition wall and the fourth wall are integrally formed, and the first direction is perpendicular to the second direction.

[0014] In some embodiments, the insulating layer further includes a third insulating layer located between the fourth wall and the battery cell module, and along the third direction, the length of the first insulating layer is equal to the distance between the third wall and the fourth wall.

[0015] In some embodiments, the battery pack further includes a buffer member positioned between the battery cells. The buffer member includes a first portion connected to the insulating layer and a second portion extending from the insulating layer, wherein the second portion is connected to the first structural member. The buffer member includes micropores. When the buffer member is compressed, air within the micropores can be discharged from the buffer member through the second portion, providing more space for the battery cell module to expand.

[0016] In some embodiments, along the first direction, the buffer is located between the housing and the battery cell module.

[0017] In some embodiments, an air gap is provided between the second structural member and the housing along the second direction, and air discharged from the second portion of the buffer member can enter the air gap.

[0018] In some embodiments, the buffer member includes a first buffer member located between the battery cells, the battery pack is also connected to a third structural member of the first structural member, the first structural member is located between the second components of the battery cells, the third structural member is located between the first components of the battery cells, a portion of the first structural member extends out of the insulating layer, and the first buffer member includes the first structural member and the third structural member.

[0019] In some embodiments, the buffer member includes a second buffer member located between the housing and the battery module, wherein the second portion of the second buffer member includes a protrusion connected to the second structural member. The protrusion is connected to the second structural member to support the second structural member.

[0020] In some embodiments, the second structural member defines a second through-hole, the raised portion includes a first section and a second section, the second section is connected to the second structural member, and when viewed from the second direction, the first section is located within the second through-hole. Air released from the raised portion of the buffer member can be discharged through the second section and the second through-hole in the second structural member.

[0021] In some embodiments, the third wall is provided with a first support portion, the fourth wall is provided with a second support portion, the second structural member is provided on the first support portion and the second support portion, and along the third direction, the protrusion is located between the first support portion and the second support portion, thereby limiting the protrusion.

[0022] In some embodiments, the battery pack includes a plurality of the first buffer members, and a first buffer member is disposed between every two adjacent battery cells in the plurality of battery cells to provide expansion space for the battery cells when the battery cells are compressed.

[0023] In some embodiments, along the second direction, the end surface of the second member away from the first member is substantially coplanar with the bottom surface of the recess, making the bottom of the first flow channel formed by the recess flatter and more continuous, thereby allowing the insulating material to flow more quickly and smoothly to the end of the first flow channel.

[0024] In some embodiments, the second structural member includes a detachably connected third portion and a fourth portion, each of which is stepped and connected at ends with smaller end surfaces. This reduces the probability of the second structural member bending at the recess during manufacturing.

[0025] In some embodiments, the battery pack further includes a third buffer located between the battery cell module and the second wall of the housing, and configured to absorb the expansion volume of the battery cell toward the second wall during expansion.

[0026] In some embodiments, the third buffer member includes two buffer bars, with a gap between the two buffer bars and the two buffer bars extending along the first direction. The two buffer bars are used to block the insulating material, reducing the possibility of the insulating material entering the gap between the two buffer bars, thereby providing more space for the battery cell to expand.

[0027] Another aspect of an embodiment of the present application provides an electric device, which includes any of the battery packs described above.

[0028] Beneficial effects of the embodiments of the present application:

[0029] An embodiment of the present application provides a battery pack and an electrical device, in which a cell module and a shell are bonded and connected by an insulating layer. During the fixing process, the insulating layer bonds and fixes the cell module and the shell, thereby limiting the movement of the cell module. In addition, along the second direction, the first structural member is located between the cell module and the shell. The battery pack may include a plurality of first structural members, and a plurality of recesses on the plurality of first structural members together form a first flow channel, the first flow channel extending along the first direction, and the first flow channel is connected to the gap. When the insulating material is injected into the first space, the insulating material will flow into the recess and the gap, and flow along the first flow channel formed by the recess, thereby accelerating the flow speed of the insulating material, thereby shortening the flow time of the insulating material in the battery pack shell 1. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. The drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

[0031] Figure 1 A structural diagram of a battery pack in some embodiments of the present application;

[0032] Figure 2 An exploded structural diagram of a portion of a battery pack in some embodiments of the present application;

[0033] Figure 3 A partial structural diagram of a battery pack in some embodiments of the present application;

[0034] Figure 4 Another partial structural diagram of a battery pack in some embodiments of the present application;

[0035] Figure 5a In some embodiments of the present application, a battery pack is not filled with insulating material. Figure 1 A cross-section in the AA direction;

[0036] Figure 5b for Figure 5a Enlarged view of the middle A1 region;

[0037] Figure 6a A battery pack filled with insulating material in some embodiments of the present application Figure 1 A cross-section in the AA direction;

[0038] Figure 6b for Figure 6a Enlarged view of the middle A2 area;

[0039] Figure 7 A structural diagram of a battery cell in some embodiments of the present application;

[0040] Figure 8 Another cross-sectional view of a battery pack in some embodiments of the present application;

[0041] Figure 9 for Figure 8 Enlarged view of area B in the middle;

[0042] Figure 10 A top view of a battery pack in some embodiments of the present application;

[0043] Figure 11 A structural diagram of a BMS circuit board in some embodiments of the present application;

[0044] Figure 12 A structural diagram of a first structural member in some embodiments of the present application;

[0045] Figure 13 This is another partial structural diagram of a battery pack in some embodiments of the present application;

[0046] Figure 14 for Figure 13 Enlarged view of area D in the middle;

[0047] Figure 15 This is a partial structural diagram of a housing in some embodiments of the present application;

[0048] Figure 16 for Figure 8 Magnified view of area C in the middle.

[0049] Reference numerals: 1-housing; 11-first wall; 111-first partition wall; 112-second partition wall; 113-first through hole; 12-second wall; 13-third wall; 131-first support portion; 14-fourth wall; 141-second support portion; 15-fifth wall; 16-sixth wall; 2-cell module; 21-cell; 211-ear; 212-first component; 213-second component; 214-second gap; 3-insulating layer; 31-first insulating layer; 32-fourth insulating layer; 4-first structural member; 40-third structural member ;41-recess;43-third part;44-fourth part;42-first flow channel;5-second structural member;51-BMS circuit board;52-second through hole;53-third through hole;511-fourth through hole;512-conductive sheet;6-air gap;7-buffer;701-first buffer;702-second buffer;71-first part;72-second part;721-raised part;7211-first section;7212-second section;8-gap;81-first gap;9-third buffer;91-buffer strip. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field based on this application are within the scope of protection of this application.

[0051] like Figures 1 to 6bAs shown, an embodiment of the first aspect of the present application provides a battery pack. The battery pack includes a shell 1, a battery cell module 2, an insulating layer 3 and a first structural member 4. Among them, the shell 1 includes a first space, the battery cell module 2 is placed in the first space, and the battery cell module 2 includes a plurality of battery cells 21 stacked along a first direction. A gap 8 is formed between the battery cell module 2 and the shell 1, and the battery cell 21 includes an electrode assembly (not shown), a battery cell shell, and an electrode terminal connected to the electrode assembly and led out from the battery cell shell. The insulating layer 3 is formed by injecting an insulating material into the first space and curing it. Along the first direction, the first structural member 4 is arranged between the electrode terminals, the first structural member 4 includes a recess 41, the recess 41 is formed with a groove, the groove is connected to the gap 8, and the insulating layer 3 is arranged in the recess 41 and the gap 8.

[0052] In the embodiment of this application, Figure 2 As shown, the housing 1 includes a first wall 11 and a second wall 12 arranged opposite to each other along the second direction, a third wall 13 and a fourth wall 14 arranged opposite to each other along the third direction, and a fifth wall 15 and a sixth wall 16 arranged opposite to each other along the first direction. Figure 1 and Figure 2 As shown, the first direction is perpendicular to the second direction, and the third direction is perpendicular to the first direction and the second direction.

[0053] According to the battery pack provided in the embodiment of the present application, along the second direction, the first structural member 4 is located between the battery module 2 and the housing 1. Figure 3 As shown, the battery pack may include multiple first structural members 4. Multiple recesses 41 on the multiple first structural members 4 collectively form a first flow channel 42. The first flow channel 42 extends along a first direction and communicates with the gap 8. When insulating material is injected into the first space, the insulating material flows into the recesses 41 and the gap 8 and flows along the first flow channel 42 formed by the recesses 41, accelerating the flow of the insulating material and thereby shortening the flow time of the insulating material within the battery pack housing 1. The first structural members 4 may be made of an elastic material such as foam or sponge.

[0054] In some embodiments, such as Figure 2 As shown, the housing 1 includes a third wall 13 and a fourth wall 14 arranged opposite each other along a third direction. The first wall 11 includes a first partition wall 111 and a second partition wall 112 that are detachably connected. The first partition wall 111 and the third wall 13 are integrally formed, and the second partition wall 112 and the fourth wall 14 are integrally formed. The embodiment of the present application does not limit the connection method between the first partition wall 111 and the second partition wall 112. For example, the first partition wall 111 and the second partition wall 112 may be connected by fasteners or adhesive bonding.

[0055] In the embodiment of the present application, the material of the housing 1 includes, but is not limited to, aluminum, plastic, etc. The insulating layer 3 is formed by injecting an insulating material into the first space of the housing 1 and then curing it. The insulating material can be a glue, such as polyurethane glue, organic silicone glue, or potting glue. The insulating material can also include epoxy resin, etc., which is not specifically limited in the embodiment of the present application.

[0056] In the embodiment of the present application, along the second direction, the first structural member 4 is disposed between the first wall 11 and the battery module 2, and a gap 8 is provided between the battery module 2 and the housing 1. A recess 41 is provided on the side of the first structural member 4 facing the first wall 11, and the groove formed by the recess 41 is connected to the gap 8. Along the first direction, the width of the groove formed by the recess 41 is equal to the width of the first structural member 4, that is, the groove passes through the first structural member 4 along the first direction. When the battery pack includes multiple first structural members 4, the recesses 41 on the multiple first structural members 4 can jointly form a first flow channel 42. Among them, the gap 8 includes two first gaps 81 located between the housing 1 and the battery module 2 along the first direction, one of the first gaps 81 is located between the sixth wall 16 and the battery module 2, and the other first gap 81 is located between the battery module 2 and the fifth wall 15. The gap 8 also includes two third gaps (not shown) located between the shell 1 and the battery module 2 along the third direction, one of which is located between the third wall 13 and the battery module 2, and the other is located between the battery module 2 and the fourth wall 14.

[0057] In some embodiments, such as Figure 7 As shown, the cell housing includes a first member 212 for accommodating the electrode assembly and a second member 213 extending outward from the first member 212. The electrode terminal extends out of the cell housing from the second member 213. Along a first direction, the first structural member 4 is disposed between the second members 213 of adjacent cells. The electrode terminal may include a tab 211. One end of the tab 211 is positioned within the first member 212 and connected to the electrode assembly within the first member 212. The other end of the tab 211 extends out of the cell housing through the second member 213. Optionally, the cell housing comprises an aluminum-plastic film, and the cell 21 is a pouch cell.

[0058] In some embodiments, such as Figure 5a and Figure 5b As shown, the battery pack further includes a second structural member 5 . Along the second direction, the second structural member 5 is located between the first wall 11 and the first component 212 .

[0059] In the embodiment of the present application, the second structural member 5 may include a BMS (Battery Management System) circuit board 51. Figure 5a As shown, along the second direction, the BMS circuit board 51 is located between the first wall 11 of the housing 1 and the first member 212. Figure 7 As shown, the electrode terminal may include two tabs 211, the two tabs 211 including a positive tab and a negative tab, and the two tabs 211 of each battery cell 21 are connected to the BMS circuit board 51. Specifically, as Figure 11 As shown, the BMS circuit board 51 is provided with multiple pairs of fourth through holes 511 that match the shape of the tabs 211. Along the first direction, the two fourth through holes 511 in each pair of fourth through holes 511 are arranged opposite each other, and a conductive sheet 512 is provided between each pair of fourth through holes 511. The two tabs 211 of two adjacent battery cells 21 with opposite polarity pass through the two fourth through holes 511 and then connect to the conductive sheet 512, thereby connecting the two tabs 211 of the battery cells 21 to the BMS circuit board 51. The conductive sheet 512 may be a conductive copper sheet or a conductive nickel sheet, for example.

[0060] In some embodiments, such as Figure 8 and Figure 9 As shown, along the second direction, the end surface of the second member 213 away from the first member 212 and the bottom surface of the recess 41 are substantially located in the same plane.

[0061] In the embodiment of the present application, along the first direction, the first structural member 4 is positioned between the second members 213 of the battery cell 21. The end surface of the second member 213, which is distal to the first member 212, is substantially flush with the bottom surface of the recess 41, making the bottom of the first flow channel 42 flatter and more continuous, allowing the insulating material to flow more quickly and smoothly to the end of the first flow channel 42. The substantially flush positioning of the end surface of the second member 213 and the recess 41 can be understood as meaning that the error range between the top surface of the second member 213 and the bottom surface of the recess 41 is 0-±10%.

[0062] In some embodiments, along the first direction, the insulating layer 3 includes a first insulating layer 31, the first insulating layer 31 is located between the second components 213 of two adjacent battery cells 21, and the first insulating layer 31 is bonded to the second components 213 of the two adjacent battery cells 21. Figure 4 As shown, a second gap 214 is formed between the second components 213 of two adjacent battery cells 21 , and the first insulating layer 31 is disposed in the second gap 214 .

[0063] In some embodiments, such as Figure 4 As shown, a second gap 214 is formed between the second components 213 of adjacent battery cells 21. The second gap 214 communicates with the first flow channel 42 formed by the plurality of recesses 41. Insulating material flows into the second gap 214 and then into the first flow channel 42 connected to the second gap 214. After solidification, the insulating material in the second gap 214 forms the first insulating layer 31, strengthening the connection between the first structural member 4 and the second component 213. The width of the second gap 214 can range from 6 mm to 20 mm.

[0064] In some embodiments, along the third direction, the insulating layer 3 includes a second insulating layer (not shown) located between the third wall 13 and the battery module 2, and the first insulating layer 31 is bonded to the second insulating layer. The second insulating layer is provided in a third gap between the third wall 13 and the battery module 2. The insulating material is injected into the second gap 214 and flows from the second gap 214 to the third gap in a direction opposite to the third direction, flows into the space between the third wall 13 and the battery module 2, and solidifies to form a second insulating layer bonded to the first insulating layer 31. The insulating material flows between the third wall 13 and the battery module 2 through the second gap 214, further accelerating the flow rate of the insulating material in the housing 1.

[0065] In some embodiments, along the third direction, the insulating layer 3 further includes a third insulating layer (not shown) located between the battery cell module 2 and the fourth wall 14, and the insulating layer 3 and the third insulating layer are bonded. The third insulating layer is provided in the third gap between the fourth wall 14 and the battery cell module 2. The insulating material is injected into the second gap 214, flows from the second gap 214 to the third gap along the third direction, flows into the space between the fourth wall 14 and the battery cell module 2, and solidifies to form a third insulating layer bonded to the first insulating layer 31. The insulating material flows between the fourth wall 14 and the battery cell module 2 through the second gap 214, further accelerating the flow rate of the insulating material in the shell 1. Along the third direction, the length of the first insulating layer 31 is equal to the distance between the third wall 13 and the fourth wall 14, the first insulating layer 31 is bonded to the third wall 13, and the first insulating layer 31 is bonded to the fourth wall 14.

[0066] In addition, if Figure 6a and Figure 6b As shown, along the first direction, the insulating layer 3 includes a fourth insulating layer 32 . Along the first direction, the fourth insulating layer 32 is located between the sixth wall 16 and the battery cell module 2 . Further, the fourth insulating layer 32 is located between the battery cell module 2 and the fifth wall 15 .

[0067] In some embodiments, along the first direction, the second components 213 of two adjacent battery cells are connected by the first insulating layer 31. Optionally, the first structural member 4 is not provided between the second components 213 of some adjacent battery cells 21, and a second flow channel is formed at the second gap 214. The insulating material can flow into and fill the second flow channel. After the insulating material is cured, the first insulating layer 31 is formed. The first insulating layer 31 connects the second components 213 of some adjacent battery cells 21.

[0068] In addition, the second gap 214 may also be formed in other ways.

[0069] In one example, a first structural member 4 is provided between two adjacent battery cells 21, and along the second direction, the height of the end face of the first structural member 4 is lower than or equal to the height of the end face of the second component 213 of the battery cell 21 adjacent to it, and a second flow channel can be formed between the second components 213 of the battery cell 21 adjacent to the first structural member 4.

[0070] In some embodiments, a first through hole 113 is provided on the first wall 11 , and along the second direction, the projection of the first through hole 113 and the projection of the first insulating layer 31 at least partially overlap, and along the second direction, the projection of the first through hole 113 and the projection of the second gap 214 at least partially overlap.

[0071] In the embodiment of the present application, a first through hole 113 may be formed on the first wall 11 of the housing 1. Figure 10 The first through hole 113 is connected to the first space, and the insulating material can be injected into the first space through the first through hole 113. When the insulating material is glue, the first through hole 113 can be called a glue injection port.

[0072] In the embodiment of the present application, along the second direction, the projection of the first through hole 113 and the second gap 214 at least partially overlap. The insulating material injected into the housing 1 through the first through hole 113 flows into the second gap 214 below the first through hole 113, and then flows through the second gap 214 into the first flow channel 42 connected thereto. The second gap 214 provides a space for the insulating material to flow in multiple directions, reducing the probability of the insulating material clogging at the first through hole 113 when the insulating material does not flow smoothly. In addition, when the battery pack includes the second structural member 5, the provision of the second gap 214 also reduces the probability of the insulating material flooding the second structural member 5 when the insulating material does not flow smoothly.

[0073] In some embodiments, such as Figure 10 As shown, along the second direction, the projection of the first through hole 113 overlaps with the projection of the second component 213 of a battery cell 21, so that the insulating material poured through the first through hole 113 can flow to both sides of the second component 213 of the battery cell 21, accelerating the flow of the insulating material.

[0074] In some embodiments, such as Figure 12 As shown, the first structural member 4 includes a detachably connected third portion 43 and a fourth portion 44. The third portion 43 and the fourth portion 44 are both stepped, and the ends of the third portion 43 and the fourth portion 44 with smaller end surfaces are connected.

[0075] In the embodiment of the present application, when the first structural member 4 includes the third portion 43 and the fourth portion 44, the process of installing the first structural member 4 can be to first connect the battery cell module 2 to the second structural member 5, then install the third portion 43 and the fourth portion 44 between the battery cell module 2 and the second structural member 5, and then connect the third portion 43 and the fourth portion 44. This helps to reduce the probability of the first structural member 4 being bent at the recess 41 during the manufacturing process, thereby reducing the difficulty of installing the first structural member 4. The embodiment of the present application does not specifically limit the connection method of the third portion 43 and the fourth portion 44.

[0076] In some embodiments, the second structural member 5 is provided with a second through-hole 52, and along the second direction, the projections of the first through-hole 113, the second through-hole 52, and the first insulating layer 31 at least partially overlap. When insulating material is injected into the first space through the first through-hole 113, the insulating material can flow from the second through-hole 52 in the second structural member 5 into the first flow channel 42 or the second gap 214 below the second through-hole 52, thereby reducing the probability of the insulating material flooding the second structural member 5. In one example, along the second direction, the orthographic projection of the first through-hole 113 can be less than or equal to the orthographic projection of the second through-hole 52, to facilitate the flow of insulating material into the first space.

[0077] In some embodiments, the battery pack further includes a buffer 7, the buffer 7 is located between the battery cells 21, the buffer 7 includes a first portion 71 connected to the insulating layer 3 and a second portion 72 extending out of the insulating layer 3, and the second portion 72 is connected to the first structural member 4. The buffer 7 includes micropores, and when the buffer 7 is compressed, the air in the micropores can be discharged from the buffer through the second portion 72, providing more expansion space for the battery cell module 2. Optionally, the buffer 7 can limit the insulating material from entering the interior of the buffer 7 during the curing process. Optionally, the buffer 7 includes polyolefin foam. Optionally, the buffer 7 includes polyolefin foam, and the polyolefin foam is formed by foaming the insulating material at a foaming ratio of 20-30 times. Further, the polyolefin foam has a Shore C hardness of 35 degrees to 45 degrees.

[0078] In some embodiments, along the first direction, the buffer member 7 includes a first buffer member 701 located between the battery cells 21 , and the buffer member 7 further includes a second buffer member 702 located between the battery cell module 2 and the housing 1 .

[0079] In this embodiment of the present application, along a first direction, a first buffer member 701 is positioned between the battery cells 21, and a second buffer member 702 is positioned between the battery cell module 2 and the housing 1. These members absorb the expansion of the battery cells 21 as they expand, reducing the possibility of swelling of the battery pack housing 1 due to the expansion of the battery cells 21. Furthermore, the buffer member 7 includes a first portion 71 connected to the insulating layer 3 and a second portion 72 extending beyond the insulating layer 3. The second portion 72 provides a gas release channel for the buffer member 7. When the buffer member 7 is squeezed, internal gas can be discharged through the second portion 72, improving the phenomenon in which the insulating material restricts the expansion of the battery cells.

[0080] In addition, the first buffer member 701 located between the battery cells 21 can be located between the battery cells 21 without being connected to the battery cells 21. The first buffer member 701 located between the battery cells 21 can also be bonded to the battery cells 21 located on both sides of the first buffer member 701 using double-sided tape, thereby preventing insulating material from entering between the first buffer member 701 and the battery cells 21.

[0081] In some embodiments, the battery pack further includes a third structural member 40 connected to the first structural member 4. The first structural member 4 is located between the second members 213 of the battery cells 21, and the third structural member 40 is located between the first members 212 of the battery cells. A portion of the first structural member 4 extends beyond the insulating layer 3. The first buffer member 701 includes the third structural member 40 and the first structural member 4. Furthermore, the first portion 71 of the first buffer member 701 connected to the insulating layer 3 includes the third structural member 40, and the second portion 72 of the first buffer member 701 extending beyond the insulating layer 3 includes the third structural member 40. Optionally, the third structural member 40 comprises foam. Optionally, the third structural member 40 can prevent the insulating material from entering the interior of the buffer member 7 during the curing process. Optionally, the third structural member 40 comprises polyolefin foam. The polyolefin foam is formed by expanding the insulating material at a foaming ratio of 20-30 times. Furthermore, the polyolefin foam has a Shore C hardness of 35-45 degrees. Optionally, the first structural member 4 comprises foam. Optionally, the first structural member 4 can restrict the insulating material from entering the interior of the buffer member 7 during the curing process. Optionally, the first structural member 4 comprises polyolefin foam. Optionally, the first structural member 4 comprises polyolefin foam, which is formed by foaming the insulating material at a foaming ratio of 20-30 times. Furthermore, the polyolefin foam has a Shore C hardness of 35-45 degrees.

[0082] In the embodiment of the present application, the battery pack may include a second buffer 702, which may be located on one side of the battery module 2 along the first direction. The battery pack may also include two second buffers 702, which are respectively located on both sides of the battery module 2 along the first direction.

[0083] In addition, the second buffer member 702 can also be located on any side of the battery cell module 2 to absorb the expansion volume of multiple battery cells 21 when the battery cells 21 expand in all directions. Optionally, the second buffer member 702 includes foam. Optionally, the second buffer member 702 can limit the insulating material from entering the interior of the buffer member 7 during the curing process. Optionally, the second buffer member 702 includes polyolefin foam. Optionally, the second buffer member 702 includes polyolefin foam, and the polyolefin foam is formed by foaming the insulating material at a foaming ratio of 20-30 times. Further, the Shore C hardness of the polyolefin foam is 35 degrees to 45 degrees.

[0084] In some embodiments, an air gap 6 is defined between the second structural member 5 and the housing 1 along the second direction. Specifically, the air gap 6 is defined between the second structural member 5 and the first wall 11 of the housing 1, and the insulating layer 3 does not fill the air gap 6. Therefore, air exhausted from the second portion 72 of the buffer member 7 can enter the air gap 6.

[0085] In some embodiments, the second portion 72 of the buffer member 7 includes a protrusion 721 , and the protrusion 721 is connected to the second structural member 5 .

[0086] In this embodiment of the present application, the raised portion 721 is connected to the second structural member 5 to support the second structural member 5. When the battery pack includes two buffer members 7, and the two buffer members 7 are located on either side of the battery cell module 2 along the first direction, the raised portions 721 of the two buffer members 7 jointly support the second structural member 5. Optionally, the raised portion 721 is connected to the second structural member 5. This embodiment of the present application does not specifically limit the connection method between the second structural member 5 and the raised portion 721.

[0087] In some embodiments, such as Figure 11 As shown, a third through hole 53 is provided on the second structural member 5. The third through hole 53 is arranged near one side edge of the second structural member 5 along the first direction, and the third through hole 53 corresponds to the raised portion 721 of the buffer member 7 below the second structural member 5. In addition, two third through holes 53 can be provided on the second structural member 5, and the two third through holes 53 are respectively provided near the two side edges of the second structural member 5 along the first direction. The third through hole 53 is provided on the second structural member 5, so that when the buffer member 7 is squeezed, the air released through the second part 72 of the buffer member 7 can be discharged through the third through hole 53 on the second structural member 5. Among them, the third through hole 53 can be a square hole or a round hole, and this embodiment of the present application does not specifically limit this.

[0088] In some embodiments, such as Figure 13 and Figure 14As shown, the raised portion 721 includes a first section 7211 and a second section 7212. The second section 7212 is connected to the second structural member 5. When viewed from the second direction, the first section 7211 is located within the third through hole 53. When the second buffer member 702 between the battery cell module 2 and the housing 1 is squeezed, air in the second buffer member 702 can be discharged through the first section 7211.

[0089] In some embodiments, the housing 1 includes a third wall 13 and a fourth wall 14 arranged opposite to each other along the third direction. The third wall 13 and the fourth wall 14 have substantially the same structure. The third wall 13 is used as an example for description. Figure 5b and Figure 15 As shown, the third wall 13 is provided with a first support portion 131, and the fourth wall 14 is provided with a second support portion 141. Along the third direction, the protrusion 721 is located between the first support portion 131 and the second support portion 141 to limit the protrusion 721. Along the second direction, the first support portion 131 and the second support portion 141 are both located below the second structural member 5 to support the second structural member 5.

[0090] In some embodiments, such as Figure 16 As shown, the battery pack further includes a third buffer 9, which is located between the battery cell module 2 and the second wall 12 of the housing 1. The third buffer 9 is used to absorb the expansion volume of the battery cell 21 toward the second wall 12 when it expands.

[0091] In some embodiments, the third buffer member 9 includes two buffer bars 91, with a gap between them and extending along the first direction. The two buffer bars 91 also serve to block insulating material, reducing the possibility of insulating material entering the gap between the two buffer bars 91, thereby providing more space for the battery cell 21 to expand.

[0092] A second aspect of the embodiments of the present application provides an electrical device comprising a battery pack according to any of the aforementioned embodiments. The electrical device may be a means of transportation such as an electric bicycle, an electric car, or an electric skateboard, and the embodiments of the present application are not specifically limited thereto. Furthermore, because the electrical device comprises a battery pack according to any of the aforementioned embodiments, the electrical device according to the embodiments of the present application also possesses the advantages of the battery packs according to any of the aforementioned embodiments.

[0093] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0094] The above description is only a preferred embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application are included in the scope of protection of the present application.

Claims

1. A battery pack, comprising a housing and a cell module, wherein the housing comprises a first space, the cell module is disposed within the first space, the cell module comprises a plurality of cells stacked along a first direction, a gap is formed between the cell module and the housing, the cell comprising an electrode assembly, a cell housing, and an electrode terminal connected to the electrode assembly and extending from the cell housing, wherein: The battery pack includes: an insulating layer, the insulating layer being formed by injecting an insulating material into the first space and curing the insulating material; A plurality of first structural members are provided along a first direction between the electrode terminals, each of the first structural members includes a recessed portion, the recessed portion is formed with a groove, the plurality of recessed portions form a first flow channel, the first flow channel is connected to the gap, and the insulating layer is provided in the recessed portion and the gap.

2. The battery pack according to claim 1, wherein: The battery cell housing includes a first component for accommodating the electrode assembly and a second component extending outward from the first component. The electrode terminal extends out of the battery cell housing from the second component. Along the first direction, the first structural member is arranged between the second components of two adjacent battery cells.

3. The battery pack according to claim 2, wherein: Along the first direction, the insulating layer includes a first insulating layer, the first insulating layer is located between the second components of two adjacent battery cells, and the first insulating layer is bonded to the second components of the two adjacent battery cells.

4. The battery pack according to claim 3, wherein: The shell includes a third wall and a fourth wall arranged opposite to each other along a third direction. Along the third direction, the insulation layer includes a second insulation layer located between the third wall and the battery cell module, and the first insulation layer and the second insulation layer are bonded.

5. The battery pack according to claim 3, wherein: Along the first direction, the second components of the two adjacent battery cells are connected through the first insulating layer.

6. The battery pack according to claim 3, wherein: The housing includes a first wall and a second wall opposite to each other along a second direction. A first through hole is provided on the first wall. Along the second direction, a projection of the first through hole and a projection of the first insulating layer at least partially overlap.

7. The battery pack according to claim 6, characterized in that: The battery pack further comprises: A second structural member is located between the first wall and the first component along the second direction. A second through hole is provided on the second structural member. Along the second direction, the projection of the first through hole, the projection of the second through hole, and the projection of the first insulating layer at least partially overlap.

8. The battery pack according to claim 6, wherein: The shell includes a third wall and a fourth wall arranged opposite to each other along a third direction, the first wall includes a first partition wall and a second partition wall that are detachably connected, the first partition wall and the third wall are integrally formed, the second partition wall and the fourth wall are integrally formed, and the first direction is perpendicular to the second direction.

9. The battery pack according to claim 4, wherein: The insulating layer further includes a third insulating layer located between the fourth wall and the battery cell module, and along the third direction, a length of the first insulating layer is equal to a distance between the third wall and the fourth wall.

10. The battery pack according to claim 1, wherein: The battery pack further comprises: A buffer component is located between the battery cells, and includes a first portion connected to the insulating layer and a second portion extending out of the insulating layer, wherein the second portion is connected to the first structural component.

11. An electrical device, characterized in that: The electrical device comprises the battery pack according to any one of claims 1 to 9.

Images