Battery pack and electrical equipment

Abstract

An embodiment of the present application provides a battery pack and an electrical device. The battery pack includes a housing, a battery cell module, an insulating layer, and a buffer member. Among them, the housing includes a first space, the battery cell module is placed in the first space, and the battery cell module includes a plurality of battery cells stacked along a first direction; the insulating layer is formed by injecting an insulating material into the first space and curing it; the buffer member is located between the battery cells, and / or the buffer member is located between the plurality of battery cells and the housing. The buffer member includes a first portion connected to the insulating layer and a second portion extending out of the insulating layer. The gas in the first portion can be discharged through the second portion to provide more expansion space for the battery cell module.

Description

Technical Field

[0001] The present application relates to the technical field of electrochemical devices, and particularly to a battery pack and an electrical device using the same. Background Art

[0002] An existing battery pack includes a housing and a battery cell module disposed within the housing. After encapsulating the battery cell module within the housing, an insulating material (such as potting glue, etc.) can be injected into the housing through the housing, so that the insulating material wraps around the battery cell module and fills the gaps between the individual battery cells in the battery cell module, thereby achieving effects such as fixing the battery cell module and preventing damage to the housing of the lithium battery. However, the insulating material restricts the expansion of the battery cells. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide a battery pack and an electrical device using the same, so as to improve the problem that the insulating material of the battery pack restricts the expansion of the battery cells. The specific technical solutions are as follows:

[0004] In one aspect of the embodiments of the present application, a battery pack is provided. The battery pack includes a housing and a battery cell module. The housing forms a first space, and the battery cell module is disposed within the first space. The battery cell module includes a plurality of battery cells stacked in a first direction. In addition, the battery pack further includes: an insulating layer obtained by injecting an insulating material into the first space and curing; a first buffer member located between the battery cells and / or between the plurality of battery cells and the housing. The first buffer member includes a first portion connected to the insulating layer and a second portion extending out of the insulating layer.

[0005] According to the battery pack provided by the embodiments of the application, it includes a housing, a battery cell module, an insulating layer, and a first buffer member. Among them, the battery cell module is disposed within the housing, and the insulating layer is obtained by injecting an insulating material into the first space of the housing and curing to fix the battery cell module. The battery cell module includes a plurality of battery cells stacked in a first direction. The first buffer member is disposed between the battery cells and / or between the battery cell module and the housing to absorb the expansion volume of the battery cells when the battery cells expand, and reduce the bulging of the housing of the battery pack caused by excessive expansion of the battery cells. In addition, the first buffer member includes a first portion connected to the insulating layer and a second portion extending out of the insulating layer. The insulating layer does not completely wrap the first buffer member, and the second portion provides a gas release channel for the first buffer member, so that the gas inside the first buffer member can be discharged through the second portion when the first buffer member is squeezed, enabling the first buffer member to absorb more expansion volume of the battery cells and further improving the bulging phenomenon of the housing of the battery pack.

[0006] In some embodiments, along the first direction, the buffer member is located between the housing and the battery cell module.

[0007] In some embodiments, the battery pack further includes a first structural member disposed in the first space. The housing includes a first wall and a second wall oppositely disposed along a second direction, and along the second direction, the first structural member is located between the first wall and the battery cell module.

[0008] In some embodiments, the first structural member includes a circuit board.

[0009] In some embodiments, along the second direction, there is an air gap between the first structural member and the housing. The air discharged from the second part of the buffer member can enter the air gap.

[0010] In some embodiments, the buffer member includes a first buffer member located between the housing and the battery cell module. The second part of the first buffer member includes a protruding portion, and the protruding portion is connected to the first structural member. The protruding portion is connected to the first structural member to support the first structural member.

[0011] In some embodiments, a first through hole is formed in the first structural member. The protruding portion includes a first section and a second section. When observed along the second direction, the first section is located in the first through hole, and the second section is connected to the first structural member. The air released from the protruding portion of the buffer member can be discharged through the second section and the first through hole in the first structural member.

[0012] In some embodiments, the housing includes a third wall and a fourth wall oppositely disposed along a third direction. The third wall is provided with a first support portion, and the fourth wall is provided with a second support portion. The first structural member is disposed on the first support portion and the second support portion. Along the third direction, the protruding portion is located between the first support portion and the second support portion, thereby limiting the protruding portion.

[0013] In some embodiments, the battery cell includes an electrode assembly, a battery cell housing, and electrode terminals connected to the electrode assembly and extending out of the battery cell housing. The battery cell housing includes a first member for accommodating the electrode assembly and a second member extending outward from the first member. The electrode terminals extend out of the battery cell housing from the second member.

[0014] In some embodiments, along the first direction, the first buffer member is located between the housing and the battery cell housing.

[0015] In some embodiments, the buffer member further includes a second buffer member located between the battery cells. The second buffer member includes a second structural member and a third structural member connected to the second structural member. The second structural member is located between the second members of the battery cells, the third structural member is located between the first members of the battery cells, and a part of the second structural member extends out of the insulating layer.

[0016] In some embodiments, a second through hole communicating with the first space is formed in the housing. The insulating layer includes a first insulating layer located between adjacent second members. Along the second direction, the projection of the second through hole and the projection of the first insulating layer at least partially overlap. The insulating material is injected into the first space through the second through hole.

[0017] In some embodiments, at least two adjacent second members are connected by the first insulating layer.

[0018] In some embodiments, a gap is formed between the battery cell module and the housing. The second structural member includes a recess, and a groove is formed in the recess. The groove communicates with the gap, and the insulating layer is provided in the recess and the gap. The recesses of multiple second structural members can form a first flow channel. 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, which speeds up the flow rate of the insulating material, thereby shortening the flow time of the insulating material in the battery pack housing.

[0019] In some embodiments, 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.

[0020] In some embodiments, the first wall includes a first sub-wall and a second sub-wall that are detachably connected. The first sub-wall and the third wall are integrally formed, the second sub-wall and the fourth wall are integrally formed, and the third direction is perpendicular to the first direction and the second direction.

[0021] 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.

[0022] In some embodiments, the battery pack includes a plurality of the second buffer members, and one of the second buffer members is provided between every two adjacent battery cells among the plurality of battery cells.

[0023] In some embodiments, along the second direction, the end face of the second member away from the first member and the bottom surface of the concave portion are substantially in the same plane, such that the bottom of the first flow channel is flatter and more coherent, so that the insulating material can flow to the end of the first flow channel more quickly and smoothly.

[0024] In some embodiments, a second gap is formed between the second members of adjacent battery cells, and the second gap communicates with the first flow channel.

[0025] In some embodiments, the second structural member includes a third part and a fourth part that are detachably connected. Both the third part and the fourth part are stepped, and the ends with smaller end face areas of the third part and the fourth part are connected. Thereby reducing the probability that the second structural member bends at the concave portion during the manufacturing process.

[0026] In some embodiments, the battery pack further includes a third buffer member located between the battery cell module and the second wall of the housing. The third buffer member is used to absorb the expansion volume of the battery cell towards the second wall when the battery cell expands.

[0027] In some embodiments, the third buffer member includes two buffer strips. There is a gap between the two buffer strips and the two buffer strips extend along the first direction. The two buffer strips are used to block the insulating material, reducing the possibility of the insulating material entering the gap between the two buffer strips, thereby providing a larger expandable space for the battery cell.

[0028] Another aspect of the embodiments of the present application provides an electrical device, which includes the battery pack described in any one of the above.

[0029] Advantages of the embodiments of the present application:

[0030] A battery pack and an electrical device provided by the embodiments of the present application. The buffer member includes a first part and a second part. The first part is connected to the insulating layer, and the second part extends out of the insulating layer. The gas in the first part can be discharged through the second part. The buffer member can absorb the expansion volume of the battery cell when the battery cell expands, reducing the bulging of the housing of the battery pack caused by excessive expansion of the battery cell. Further, the buffer member includes micropores. When the buffer member is compressed, the air in the micropores can be discharged from the buffer member through the second part. The second part reserves a gas release channel for the first buffer member, so that the gas inside the first buffer member can be discharged through the second part when the first buffer member is squeezed, providing more expansion space for the battery cell module and further improving the bulging phenomenon of the housing of the battery pack. Description of the Drawings

[0031] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. The drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other embodiments can also be obtained based on these drawings.

[0032] Figure 1 It is a structural diagram of a battery pack in some embodiments of the present application;

[0033] Figure 2 It is an exploded structural diagram of a partial structure of a battery pack in some embodiments of the present application;

[0034] Figure 3a It is a sectional view of a battery pack without filled insulating material along the Figure 1 A-A direction in the present application;

[0035] Figure 3b It is Figure 3a An enlarged view of area A1 in the present application;

[0036] Figure 4a It is a sectional view of a battery pack filled with insulating material along the Figure 1 A-A direction in the present application;

[0037] Figure 4b It is Figure 4a An enlarged view of area A2 in the present application;

[0038] Figure 5 It is a structural diagram of a battery cell in some embodiments of the present application;

[0039] Figure 6 It is a structural diagram of a BMS circuit board in some embodiments of the present application;

[0040] Figure 7 It is a partial structural diagram of a battery pack in some embodiments of the present application;

[0041] Figure 8 It is Figure 7 An enlarged view of area D in the present application;

[0042] Figure 9 It is a top view of a battery pack in some embodiments of the present application;

[0043] Figure 10 It is another sectional view of a battery pack in some embodiments of the present application;

[0044] Figure 11 It is Figure 10 An enlarged view of area B in the present application;

[0045] Figure 12 Another partial structural diagram of a battery pack in some embodiments of the present application;

[0046] Figure 13 Another partial structural diagram of a battery pack in some embodiments of the present application;

[0047] Figure 14 A structural diagram of a second structural member in some embodiments of the present application;

[0048] Figure 15 is Figure 10 An enlarged view of region C in

[0049] Figure 16 A partial structural diagram of a housing in some embodiments of the present application.

[0050] Reference numerals: 1 - housing; 11 - first wall; 111 - first sub-wall; 112 - second sub-wall; 12 - second wall; 13 - third wall; 131 - first support portion; 14 - fourth wall; 141 - second support portion; 15 - fifth wall; 16 - sixth wall; 17 - second through-hole; 2 - battery cell module; 21 - battery cell; 211 - tab; 212 - first member; 213 - second member; 214 - second gap; 3 - insulating layer; 31 - first insulating layer; 32 - fourth insulating layer; 4 - buffer member; 401 - first buffer member; 402 - second buffer member; 41 - first part; 42 - second part; 421 - protrusion; 4211 - first section; 4212 - second section; 5 - first structural member; 51 - BMS circuit board; 511 - third through-hole; 512 - conductive sheet; 52 - first through-hole; 53 - fourth through-hole; 6 - air gap; 7 - second structural member; 71 - recess; 72 - first flow channel; 73 - third part; 74 - fourth part; 8 - gap; 81 - first gap; 9 - third buffer member; 91 - buffer strip. Detailed implementation manners

[0051] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a 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 those of ordinary skill in the art based on the present application belong to the scope of protection of the present application.

[0052] Such as Figures 1 to 4bAs shown in the figure, an embodiment of the first aspect of the present application provides a battery pack. The battery pack includes a housing 1, a battery cell module 2, an insulating layer 3, and a buffer member 4. Among them, the housing 1 includes a first space, and the battery cell module 2 is placed in the first space. The battery cell module 2 includes a plurality of battery cells 21, and the plurality of battery cells 21 are stacked along a first direction. The insulating layer 3 is formed by injecting an insulating material into the first space and curing it. The buffer member 4 is located between adjacent battery cells 21, and / or the buffer member 4 is located between the battery cells 21 and the housing 1. The buffer member 4 includes a first portion 41 and a second portion 42. The first portion 41 is connected to the insulating layer 3, and the second portion 42 extends out of the insulating layer 3. The buffer member 4 includes micropores. When the buffer member 4 is compressed, the air in the micropores can be discharged from the buffer member 4 through the second portion 42, providing more expansion space for the battery cell module 2.

[0053] According to the battery pack provided by the embodiment of the application, the buffer member 4 absorbs the expansion volume of the battery cell 21 when the battery cell 21 expands, reducing the possibility of the housing 1 bulging due to the expansion of the battery cell 21. The buffer member 4 includes a first portion 41 connected to the insulating layer 3 and a second portion 42 extending out of the insulating layer 3. The second portion 42 reserves a gas release channel for the buffer member 4. When the buffer member 4 is squeezed, the gas inside can be discharged through the second portion 42, improving the phenomenon that the insulating material restricts the expansion of the battery cell, so that the buffer member 4 can absorb more expansion volume of the battery cell 21. Optionally, the buffer member 4 can limit the entry of the insulating material into the interior of the buffer member 4 during the curing process. Optionally, the buffer member 4 includes a polyolefin foam. Optionally, the buffer member 4 includes a polyolefin foam, and the polyolefin foam is formed by foaming the insulating material at a foaming ratio of 20-30 times. Further, the Shore hardness C of the polyolefin foam is 35 degrees - 45 degrees.

[0054] In the embodiment of the present application, as Figure 2 shown, the housing 1 includes a first wall 11 and a second wall 12 oppositely arranged along a second direction, a third wall 13 and a fourth wall 14 oppositely arranged along a third direction, and a fifth wall 15 and a sixth wall 16 oppositely arranged along a first direction. Among them, the first direction is perpendicular to the second direction, and the third direction is perpendicular to the first direction and the second direction.

[0055] In some embodiments, as Figure 2As shown in the figure, the housing 1 includes a third wall 13 and a fourth wall 14 that are oppositely arranged in the third direction. The first wall 11 includes a first sub-wall 111 and a second sub-wall 112 that are detachably connected. The first sub-wall 111 and the third wall 13 are integrally formed, and the second sub-wall 112 and the fourth wall 14 are integrally formed. Among them, the embodiments of the present application do not limit the connection method of the first sub-wall 111 and the second sub-wall 112. For example, the first sub-wall 111 and the second sub-wall 112 can be connected by fasteners or adhesives, etc. The material of the housing 1 includes but is not limited to plastics, aluminum, etc. The insulating layer 3 is obtained by injecting an insulating material into the first space of the housing 1 and curing it. Among them, the insulating material can be glue, such as polyurethane glue, silicone glue, potting glue, etc. The insulating material can also be epoxy resin, etc., and the embodiments of the present application do not make specific limitations on this. During the curing process of the insulating layer 3, the battery cell module 2 and the housing 1 are bonded and fixed to limit the movement of the battery cell module 2.

[0056] In some embodiments, the battery pack includes a plurality of second buffer members 402, and one second buffer member 402 is disposed between every two adjacent battery cells 21 among the plurality of battery cells 21. The second buffer member 402 provides an expansion space for the battery cell 21 when the battery cell 21 is compressed. Among them, the material of the second buffer member 402 includes but is not limited to foam, sponge, etc., and the embodiments of the present application do not make specific limitations on this. Optionally, the second buffer member 402 can limit the insulating material from entering the inside of the second buffer member 402 during the curing process.

[0057] In addition, the second buffer member 402 located between the battery cells 21 can be bonded to the battery cell 21 through double-sided tape, so as to limit the insulating material from entering between the second buffer member 402 and the battery cell 21.

[0058] In some embodiments, along the first direction, the first buffer member 401 is located between the housing 1 and the battery cell module 2.

[0059] In the embodiments of the present application, the battery pack may include one first buffer member 401, and the first buffer member 401 may be located on one side of the battery cell module 2 along the first direction. The battery pack may also include two first buffer members 401, and the two first buffer members 401 are respectively located on both sides of the battery cell module 2 along the first direction. In addition, the first buffer member 401 may also be located on any side of the battery cell module 2 to absorb the expansion volume of the battery cell 21 when the battery cell 21 expands towards the surroundings. Optionally, the first buffer member 401 includes foam. Optionally, the first buffer member 401 can limit the insulating material from entering the inside of the buffer member 4 during the curing process. Optionally, the first buffer member 401 includes polyolefin foam. Optionally, the first buffer member 401 includes polyene foam, and the polyene butyl foam is formed by foaming the insulating material at a foaming ratio of 20 - 30 times. Further, the Shore hardness C of the polyene butyl foam is 35 degrees - 45 degrees.

[0060] In some embodiments, the battery cell 21 includes a battery cell housing, an electrode assembly (not shown), and electrode terminals. As Figure 5 shown, the battery 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 terminals extend out of the battery cell housing from the second member 213. The electrode terminals may include tabs 211. One end of the tab 211 is placed inside the first member 212 and connected to the electrode assembly inside the first member 212, and the other end of the tab 211 extends out of the battery cell housing through the second member 213.

[0061] In some embodiments, along a first direction, the first buffer member 401 is located between the housing 1 and the battery cell module 2. Further, along the first direction, the first buffer member 401 is located between the housing 1 and the battery cell housing of the battery cell 21.

[0062] In some embodiments, as Figure 3a and Figure 3b shown, the battery pack further includes a first structural member 5. Along a second direction, the first structural member 5 is located between the first wall 11 and the battery cell module 2. Specifically, along the second direction, the first structural member 5 is located between the first wall 11 and the first member 212.

[0063] In an embodiment of the present application, the first structural member 5 may include a BMS (Battery Management System) circuit board 51. As Figure 3a and Figure 3b 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. As Figure 5 shown, the electrode terminals may include two tabs 211. The two tabs 211 include a positive tab and a negative tab. The two tabs 211 of each battery cell 21 are connected to the BMS circuit board 51. Specifically, as Figure 6 shown, a plurality of pairs of third through holes 511 matching the shape of the tabs 211 are formed on the BMS circuit board 51. Along the first direction, the two third through holes 511 in each pair of third through holes 511 are oppositely arranged, and a conductive sheet 512 is arranged between each pair of third through holes 511. The two oppositely polarized tabs 211 of adjacent two battery cells 21 respectively pass through the two third through holes 511 and then are connected to the conductive sheet 512 to realize the connection between the two tabs 211 of the battery cell 21 and the BMS circuit board 51. Among them, the conductive sheet 512 may be a conductive copper sheet or a conductive nickel sheet, etc.

[0064] In some embodiments, along the second direction, there is an air gap 6 between the housing 1 and the first structural member 5. Specifically, there is an air gap 6 between the first wall 11 and the first structural member 5, and the air gap 6 is not filled with the insulating layer 3, and the air discharged from the second part 42 of the buffer member 4 can enter the air gap 6.

[0065] In some embodiments, such as Figure 7 and Figure 8 shown, the second part 42 of the first buffer member 401 includes a protruding portion 421, and the protruding portion 421 is connected to the first structural member 5.

[0066] In the embodiments of the present application, the protruding portion 421 is connected to the first structural member 5 to support the first structural member 5. When the battery pack includes two first buffer members 401 and the two first buffer members 401 are respectively located on both sides of the battery cell module 2 along the first direction, the protruding portions 421 of the two first buffer members 401 jointly support the first structural member 5. Optionally, the protruding portion 421 is connected to the first structural member 5. The embodiments of the present application do not specifically limit the connection manner between the first structural member 5 and the protruding portion 421.

[0067] In some embodiments, such as Figure 6 shown, a first through hole 52 is formed in the first structural member 5. The first through hole 52 is disposed near one side edge of the first structural member 5 along the first direction, and the first through hole 52 corresponds to the protruding portion 421 of the first buffer member 401 below the first structural member 5. In addition, two first through holes 52 may be formed in the first structural member 5, and the two first through holes 52 are respectively disposed near both side edges of the first structural member 5 along the first direction. The first through hole 52 is formed in the first structural member 5, so that when the first buffer member 401 is squeezed, the air released through the second part 42 of the first buffer member 401 can be discharged through the first through hole 52 in the first structural member 5. Among them, the first through hole 52 may be a square hole or a round hole, and the embodiments of the present application do not specifically limit this.

[0068] In some embodiments, such as Figure 8 shown, the protruding portion 421 includes a first section 4211 and a second section 4212. When observed along the second direction, the first section 4211 is located within the first through hole 52, and the first structural member 5 covers the second section 4212. The second section 4212 is connected to the first structural member 5. When the first buffer member 401 located between the battery cell module 2 and the housing 1 is squeezed, the air in the first buffer member 401 can be discharged from the first section 4211.

[0069] In this embodiment, the third wall 13 and the fourth wall 14 have substantially the same structure. Taking the third wall 13 as an example for description. The housing 1 includes a third wall 13 and a fourth wall 14 that are oppositely disposed along the third direction. 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 protruding portion 421 is located between the first support portion 131 and the second support portion 141 to limit the protruding portion 421. Along the second direction, both the first support portion 131 and the second support portion 141 are located below the first structural member 5 to support the first structural member 5.

[0070] In some embodiments, the battery pack further includes a second structural member 7 and a third structural member 70 connected to the second structural member 7. Along the first direction, the second structural member 7 is located between the second members 213 of the battery cell 21, the third structural member 70 is located between the first members 212 of the battery cell, and a part of the second structural member 7 protrudes from the insulating layer 3. Wherein, the second buffer member 402 includes the third structural member 70 and the second structural member 7. Further, the first part 41 of the second buffer member 402 connected to the insulating layer 3 includes the third structural member 70, and the structural member 7 included in the second part 42 of the second buffer member 402 protruding from the insulating layer 3. Optionally, the third structural member 70 includes foam. Optionally, the third structural member 70 can limit the entry of insulating material into the interior of the buffer member 4 during the curing process. Optionally, the third structural member 70 includes polyolefin foam. Optionally, the third structural member 70 includes polyolefin foam, and the polyolefin butyl foam is formed by foaming the insulating material at a foaming ratio of 20 - 30 times. Further, the Shore hardness C of the polyolefin butyl foam is 35 degrees - 45 degrees. Optionally, the second structural member 7 includes foam. Optionally, the second structural member 7 can limit the entry of insulating material into the interior of the buffer member 4 during the curing process. Optionally, the second structural member 7 includes polyolefin foam. Optionally, the second structural member 7 includes polyolefin foam, and the polyolefin butyl foam is formed by foaming the insulating material at a foaming ratio of 20 - 30 times. Further, the Shore hardness C of the polyolefin butyl foam is 35 degrees - 45 degrees.

[0071] In some embodiments, there is a gap 8 between the battery cell module 2 and the housing 1. Along the second direction, the second structural member 7 is located between the housing 1 and the first member 212. Along the first direction, the second structural member 7 is disposed between the electrode terminals of the battery cell 21. Further, the second structural member 7 is disposed between the second members 213 of the battery cell 21. The second structural member 7 includes a recess 71, and a groove is formed in the recess 71. The groove communicates with the gap 8, and the insulating layer 3 is disposed in the recess 71 and the gap 8.

[0072] In the embodiments of the present application, as Figure 3a and Figure 3b shown, along the second direction, the second structural member 7 is disposed between the first wall 11 and the first member 212, and there is a gap 8 between the battery cell module 2 and the housing 1. A recess 71 is provided on one side of the second structural member 7 facing the first wall 11, and the groove formed in the recess 71 communicates with the gap 8. In addition, along the first direction, the width of the groove formed by the recess 71 is equal to the width of the second structural member 7, that is, the groove penetrates the second structural member 7 along the first direction. When the battery pack includes a plurality of second structural members 7, the recesses 71 on the plurality of second structural members 7 can jointly form a first flow channel 72. Wherein, the gap 8 includes two first gaps 81. Along the first direction, one of the first gaps 81 is disposed between the fifth wall 15 and the battery cell module 2 along the first direction, and the other first gap 81 is disposed between the battery cell module 2 and the sixth wall 16 along the first direction.

[0073] When injecting an insulating material into the first space, the insulating material flows into the recess 71 and the gap 8, and flows along the first flow channel 72 formed by the recess 71, accelerating the flow rate of the insulating material, thereby shortening the flow time of the insulating material within the battery pack housing 1. Among them, the second structural member 7 may include an elastic material such as foam or sponge.

[0074] In some embodiments, such as Figure 10 and Figure 11 shown, along the second direction, the end face of the second member 213 away from the first member 212 and the bottom surface of the recess 71 are substantially in the same plane. This makes the bottom of the first flow channel 72 flatter and more coherent, enabling the insulating material to flow to the end of the first flow channel 72 more quickly and smoothly. Among them, the end face of the second member 213 and the recess 71 being substantially in the same plane can be understood as the error range between the end face of the second member 213 and the bottom surface of the recess 71 being 0 - ±10%.

[0075] In some embodiments, the insulating layer 3 includes a first insulating layer 31. Along the first direction, the first insulating layer 31 is located between the second members 213 of two adjacent battery cells 21, and the first insulating layer 31 is bonded to the second members 213 of the two adjacent battery cells 21. Such as Figure 4a , Figure 4b and Figure 13 shown, a second gap 214 is formed between the second members 213 of two adjacent battery cells 21, and the first insulating layer 31 is placed within the second gap 214.

[0076] In some embodiments, such as Figure 13 shown, a second gap 214 is formed between the second members 213 of adjacent battery cells 21, and the second gap 214 communicates with the first flow channel 72. The insulating material flows into the second gap 214 and then into the first flow channel 72 communicating with the second gap 214. After the insulating material within the second gap 214 cures, a first insulating layer 31 is formed, strengthening the connection between the second structural member 7 and the second member 213. Among them, the width range of the second gap 214 can be 6 mm - 20 mm.

[0077] 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 cell module 2, and the first insulating layer 31 is bonded to the second insulating layer. The gap 8 includes a second gap (not shown) provided between the third wall 13 and the battery cell module 2, and the second insulating layer is provided in the second gap. The insulating material is injected into the second gap 214 and flows from the second gap 214 to the second gap in a direction opposite to the third direction, flowing into the space between the third wall 13 and the battery cell module 2. After curing, a second insulating layer bonded to the first insulating layer 31 is formed. The insulating material flows into the space between the third wall 13 and the battery cell module 2 through the second gap 214, further accelerating the flow rate of the insulating material in the housing 1.

[0078] 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 first insulating layer 31 is bonded to the third insulating layer. The gap 8 includes a third gap (not shown) provided between the battery cell module 2 and the fourth wall 14, and the third insulating layer is provided in the third gap. The insulating material is injected into the second gap 214 and flows from the second gap 214 to the third gap along the third direction, flowing into the space between the fourth wall 14 and the battery cell module 2. After curing, a third insulating layer bonded to the first insulating layer 31 is formed. The insulating material flows into the space 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 housing 1. The length of the first insulating layer 31 is equal to the distance between the third wall 13 and the fourth wall 14. Along the third direction, 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.

[0079] In addition, as Figure 4a and Figure 4b shown, 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 fifth wall 15 and the battery cell module 2.

[0080] In some embodiments, along the first direction, the second members 213 of two adjacent battery cells are connected through the first insulating layer 31. Optionally, no second structural member 7 is provided between the second members 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, and after the insulating material cures, the first insulating layer 31 is formed, and the first insulating layer 31 connects the second members 213 of some adjacent battery cells 21.

[0081] In addition, the second gap 214 can also be formed in other ways.

[0082] In one example, a second structural member 7 is provided between two adjacent battery cells 21, and along the second direction, the height of the end face of the second structural member 7 is lower than or equal to the height of the end face of the second member 213 of the battery cell 21 adjacent thereto. The height of the end face of the second structural member 7 is lower than the height of the end face of other adjacent second structural members 7 to form a second flow channel at the second structural member 7.

[0083] In some embodiments, a second through hole 17 communicating with the first space is formed in the housing 1. Specifically, the second through hole 17 is formed in the first wall 11. Along the second direction, the projection of the second through hole 17 and the projection of the first insulating layer 31 at least partially overlap, and along the second direction, the projection of the second through hole 17 and the projection of the second gap 214 at least partially overlap.

[0084] In the embodiments of the present application, a second through hole 17 may be formed in the first wall 11 of the housing 1, as Figure 9 shown. The second through hole 17 communicates with the first space, and the insulating material can be injected into the first space through the second through hole 17. Wherein, when the insulating material is glue, the second through hole 17 can be referred to as a glue filling port.

[0085] In the embodiments of the present application, along the second direction, the projection of the second through hole 17 and the second gap 214 at least partially overlap. The insulating material injected into the housing 1 through the second through hole 17 flows into the second gap 214 below the second through hole 17, and then flows into the first flow channel 72 communicated therewith through the second gap 214. The second gap 214 can provide an accommodation space for the insulating material, so that the insulating material can flow in multiple directions, reducing the probability of blockage at the second through hole 17 when the insulating material does not flow smoothly. In addition, when the battery pack includes the first structural member 5, the arrangement of the second gap 214 also reduces the probability that the insulating material floods the first structural member 5 when the insulating material does not flow smoothly.

[0086] In some embodiments, as Figure 9 shown, along the second direction, the projection of the second through hole 17 and the projection of the second member 213 of a battery cell 21 overlap, so that the insulating material poured into the second through hole 17 can flow to both sides of the second member 213 of the battery cell 21, accelerating the flow of the insulating material.

[0087] In some embodiments, as Figure 14 shown, the second structural member 7 includes a detachable third part 73 and a fourth part 74. Both the third part 73 and the fourth part 74 are stepped, and the ends with smaller end face areas of the third part 73 and the fourth part 74 are connected.

[0088] In an embodiment of the present application, when the second structural member 7 includes a third part 73 and a fourth part 74, the process of installing the second structural member 7 can be as follows: First, connect the battery cell module 2 to the first structural member 5, and then install the third part 73 and the fourth part 74 between the battery cell module 2 and the first structural member 5 respectively, and then connect the third part 73 and the fourth part 74. This is beneficial to reducing the probability that the second structural member 7 is bent at the concave part 71 during the manufacturing process, and reducing the difficulty of installing the second structural member 7. Among them, the embodiment of the present application does not specifically limit the connection method of the third part 73 and the fourth part 74.

[0089] In some embodiments, as Figure 6 shown, a fourth through hole 53 is formed in the first structural member 5, and along the second direction, the projections of the second through hole 17, the fourth through hole 53, and the first insulating layer 31 at least partially overlap. When injecting an insulating material into the first space through the second through hole 17, the insulating material can be injected into the first flow channel 42 or the second gap 214 below the fourth through hole 53 on the second structural member 5, thereby reducing the probability that the insulating material floods the first structural member 5. In one example, along the second direction, the orthographic projection of the second through hole 17 can be less than or equal to the orthographic projection of the fourth through hole 53 along the second direction, so that the insulating material can flow better into the first space.

[0090] In some embodiments, as Figure 15 shown, the battery pack further includes a third buffer member 9, and the third buffer member 9 is located between the battery cell module 2 and the second wall 12 of the housing 1. The third buffer member 9 is used to absorb the expansion volume of the battery cell 21 when expanding towards the second wall 12.

[0091] In some embodiments, the third buffer member 9 includes two buffer strips 91, there is a gap between the two buffer strips 91 and the two buffer strips 91 extend along the first direction. Among them, the two buffer strips 91 are also used to block the insulating material, reducing the possibility of the insulating material entering the gap between the two buffer strips 91, thereby providing a larger expandable space for the battery cell 21.

[0092] In a second aspect of the embodiment of the present application, an electrical device is provided, and the electrical device includes the battery pack in any of the above embodiments. Among them, the electrical device can be a means of transportation such as an electric bicycle, an electric vehicle, and an electric skateboard, and the electrical device can also be an electronic device such as a mobile phone, a tablet computer, an e-reader, and a laptop computer. The electrical device can also be a wearable device, etc. The embodiment of the present application does not specifically limit this. In addition, since the electrical device includes the battery pack in any of the above embodiments, the electrical device in the embodiment of the present application also has the advantages possessed by the battery pack in any of the above embodiments.

[0093] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0094] The above are only the preferred embodiments of the present application and are not intended to limit the scope of protection of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application are included within the scope of protection of the present application.

Claims

1. A battery pack, the battery pack comprising a housing and a battery cell module, the housing including a first space, the battery cell module being disposed within the first space, the battery cell module including a plurality of battery cells stacked in a first direction, characterized in that, The battery pack includes: An insulating layer formed by injecting an insulating material into the first space and curing it; A buffer member located between the battery cells, and / or between the plurality of battery cells and the housing. The buffer member includes a first portion connected to the insulating layer and a second portion extending out of the insulating layer; The battery cell includes an electrode assembly, a battery cell housing, and an electrode terminal connected to the electrode assembly and extending out of the battery cell housing. The battery cell housing includes a first member for accommodating the electrode assembly. The first portion is located between the first members, and / or between the first member of the outermost battery cell and the housing. The second portion extends beyond the first member; The buffer member of the battery cell housing includes micropores. When the buffer member is compressed, the air in the micropores is discharged through the second portion.

2. The battery pack according to claim 1, characterized in that, Along the first direction, the buffer member is located between the housing and the battery cell module.

3. The battery pack according to claim 2, wherein The battery pack further includes: A first structural member disposed in the first space. The housing includes a first wall and a second wall oppositely disposed along a second direction. Along the second direction, the first structural member is located between the first wall and the battery cell module.

4. The battery pack according to claim 3, wherein, Along the second direction, there is an air gap between the first structural member and the housing.

5. The battery pack according to claim 3, characterized in that, The buffer member includes a first buffer member located between the housing and the battery cell module. The second portion of the first buffer member includes a protruding portion connected to the first structural member.

6. The battery pack according to claim 5, characterized in that, A first through hole is formed in the first structural member. The protruding portion includes a first section and a second section. The second section is connected to the first structural member, and when observed along the second direction, the first section is located in the first through hole.

7. The battery pack according to claim 5, wherein The housing includes a third wall and a fourth wall oppositely disposed along a third direction. The third wall is provided with a first support portion, and the fourth wall is provided with a second support portion. The first structural member is disposed on the first support portion and the second support portion, and along the third direction, the protruding portion is located between the first support portion and the second support portion.

8. The battery pack according to claim 5, characterized in that, The battery cell housing includes a second member extending outward from the first member, and the electrode terminal extends out of the battery cell housing from the second member.

9. The battery pack according to claim 8, characterized in that, Along the first direction, the first buffer member is located between the housing and the battery cell housing.

10. The battery pack according to claim 8, characterized in that, The buffer member further includes a second buffer member located between the battery cells. The second buffer member includes a second structural member and a third structural member connected to the second structural member. The second structural member is located between the second members of the battery cells, and the third structural member is located between the first members of the battery cells. A part of the second structural member extends out of the insulating layer.

11. The battery pack according to claim 8, wherein, A second through hole communicating with the first space is formed in the housing. The insulating layer includes a first insulating layer located between adjacent second members. Along the second direction, the projection of the second through hole and the projection of the first insulating layer at least partially overlap.

12. The battery pack according to claim 11, characterized in that, At least two adjacent second members are connected by the first insulating layer.

13. An electrical device, characterized in that, The electrical device includes the battery pack according to any one of claims 1 to 12.

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