Battery packs and electrical devices

Abstract

The present application provides a battery pack, including a cover plate, a battery cell module, a second resin layer and a battery pack shell, wherein the battery cell module is accommodated in the battery pack shell and fixed by the second resin layer, the cover plate is fixed to the battery pack shell, the battery cell module includes a plurality of battery cells, the plurality of battery cells are stacked along a second direction, the battery cell module further includes a detection member, the detection member and the battery cell are arranged along the second direction, and the detection member is used to detect the expansion degree of the battery cell module. It also relates to an electrical device, which can improve its own safety performance by adopting the above-mentioned battery pack.

Description

Technical Field

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

[0002] The internal cells of existing soft-pack batteries are prone to expansion during long-term use. When the expansion range of the battery exceeds the safety limit, the battery cells are prone to leakage, and the outer shell may deform or rupture due to the expansion of the battery cells, causing a series of safety problems during use. Summary of the invention

[0003] In view of this, it is necessary to provide a battery pack and an electrical device, which are intended to detect battery expansion problems and improve the safety of battery use.

[0004] An embodiment of the present application provides a battery pack, including a cover plate, a battery cell module, a second resin layer and a battery pack shell, wherein the battery cell module is accommodated in the battery pack shell and fixed by the second resin layer and the battery pack shell, the cover plate is fixed to the battery pack shell, the battery cell module includes a plurality of battery cells, and the plurality of battery cells are stacked along a second direction. The battery cell module also includes a detection member, the detection member and the battery cell are arranged along the second direction, and the detection member is used to detect the expansion degree of the battery cell module. The second resin layer is configured to be formed by injecting resin into the battery pack shell and then fixing it. The battery cell module also includes a bracket located above the battery cell module, and the detection member is arranged on a side of the bracket away from the battery cell module. The bracket includes a main body and a fixing portion connected to the main body, the fixing portion is provided with a fixing hole, the fixing portion is buckled on the inner wall of the battery pack shell through the fixing hole, and the second resin layer fixes the fixing portion and the battery pack shell.

[0005] This battery pack detects the expansion degree of the battery cell module by arranging a detection member on the battery cell module, thereby reducing safety problems caused by excessive expansion of the battery cell module and improving the safety performance of the battery pack.

[0006] In a possible implementation, the battery cell module further includes a bracket, the detection element is disposed on the bracket, and the bracket and the battery cell are disposed along the second direction.

[0007] The battery pack comprises a bracket, which can be used to fix the detection element.

[0008] In one possible implementation, the detection member includes a first detection part, a second detection part and a guide line, the first detection part is arranged on the surface of the bracket close to the cover plate, the second detection part is arranged on the first detection part, and the guide line is connected to the first detection part for transmitting information.

[0009] In this battery pack, the first detection part and the second detection part of the detection member are arranged between the cover plate and the bracket, so as to detect the expansion degree of the battery pack.

[0010] In one possible implementation, the detection member further includes a first bonding area, which is provided on the first detection portion and is used to connect the first detection portion and the second detection portion, and a gap is formed between the first detection portion and the second detection portion.

[0011] In this battery pack, by providing the first adhesive region, a gap can be formed between the first detection portion and the second detection portion in areas other than the first adhesive region.

[0012] In one possible implementation, the battery pack further includes a support portion, and the support portion is disposed between the guide wire and the bracket.

[0013] In this battery pack, the support portion is located between the guide wire and the bracket, which can increase the height of the guide wire along the second direction and raise the guide wire. When the battery cell module expands, the first detection portion and the second detection portion move, and the guide wire can move together, reducing the possibility of breaking the guide wire.

[0014] In one possible implementation, the detection member includes a first detection part, a second detection part and a connecting part, the first detection part is arranged on the bracket, the second detection part is arranged on the cover plate, and the connecting part is located between the first detection part and the second detection part and can move relative to the second detection part.

[0015] In this battery pack, the connecting portion extends from the second detecting portion toward the first detecting portion and is movable relative to the second detecting portion, so that the expansion of the battery cell module can be detected more sensitively.

[0016] In one possible implementation, the battery cell includes a first end and a second end that are relatively arranged, the battery cell includes a metal part arranged at the first end, and the battery cell module also includes a transition assembly, which is arranged at the first end of the battery cell and connects the battery cell and the detection component.

[0017] In this battery pack, the adapter assembly is used to connect the metal part and the guide wire, so that the metal part and the guide wire can be connected to the external structure, so as to monitor the internal voltage and other data of the battery cell, and after receiving the information transmitted by the guide wire, to activate the protection mechanism of the battery cell.

[0018] In one possible implementation, the adapter assembly includes an adapter plate, an adapter member and a limit member, the adapter plate is arranged at the first end of the battery cell, the adapter member is arranged on the adapter plate, and the limit member is arranged on the adapter member for limiting the adapter member.

[0019] In this battery pack, the adapter is arranged on the adapter board and is electrically connected to the adapter board, and the limiting member is used to limit the adapter arranged on the adapter board to reduce the movement of the adapter.

[0020] In one possible implementation, the bracket includes a main body, and when viewed in a direction opposite to the first direction, the distance the main body extends along a third direction is substantially the same as the distance the battery cell extends along the third direction, and the third direction and the first direction are both perpendicular to the second direction.

[0021] This battery pack is convenient for the bracket to be fixed to the battery cell through the main body.

[0022] In a possible implementation, the battery cell close to the cover plate is a first battery cell, and the bracket includes a protrusion provided on a side of the main body close to the first battery cell, and the protrusion protrudes from the main body.

[0023] This battery pack can increase the strength of the main body by providing the convex portion

[0024] In a possible implementation, the bracket further includes a fixing portion connected to the main body, and the bracket is fixed to the battery pack shell through the fixing portion.

[0025] In this battery pack, the bracket is fixed in the battery pack housing through the fixing portion, thereby playing a role in pre-positioning the bracket.

[0026] In a possible implementation, along the third direction, the fixing portion is located between the battery cell and the battery pack casing.

[0027] This type of battery pack can reduce the movement of the bracket caused by the flow of the second resin layer during the glue filling process of the battery core module.

[0028] In one possible implementation, the bracket is disposed between the cover plate and the first battery cell, and is fixed to the battery pack housing.

[0029] In this battery pack, the bracket is arranged between the cover plate and the first battery cell, that is, the detection component is located between the cover plate and the first battery cell, which is convenient for arranging the detection component.

[0030] In a possible implementation manner, there is a gap between the main body and the first battery core, and the second resin layer is disposed in the gap.

[0031] In this battery pack, the second resin layer is filled in the gap, thereby facilitating the fixing of the bracket and the first battery cell.

[0032] In a possible implementation, the cover plate is provided with a protrusion, and the protrusion is arranged opposite to the detection member.

[0033] The protruding portion in the battery pack can abut against the second detection portion, thereby making it easier to connect the first detection portion and the second detection portion, thereby improving the accuracy of the detection member.

[0034] In a possible implementation, the first detection portion includes a thin film sheet and a conductive silver paste disposed on the thin film sheet.

[0035] In this battery pack, the conductive silver paste can be used as the conductive part of the first detection part and the second detection part.

[0036] An electrical device comprises a main body and any one of the above-mentioned battery packs, wherein the battery pack is arranged in the main body.

[0037] The battery pack and electrical device provided in the present application detect the expansion degree of the battery cell module by setting a detection component on the battery cell module, so as to reduce the safety problems caused by excessive expansion of the battery cell module and improve the safety performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the three-dimensional structure of a battery pack in one embodiment of the present application.

[0039] Figure 2 for Figure 1 An exploded schematic diagram of the battery pack is shown.

[0040] Figure 3 for Figure 2 A schematic diagram of the three-dimensional structure of the cover plate from another perspective is shown.

[0041] Figure 4 for Figure 2 Schematic diagram of the exploded view of the battery cell module in the battery pack shown.

[0042] Figure 5 for Figure 2 A schematic diagram of an exploded view of another embodiment of a battery cell module is shown.

[0043] Figure 6 This is a schematic diagram of an exploded view of a battery cell module in a battery pack in another embodiment of the present application.

[0044] Figure 7 for Figure 4 A schematic diagram of the three-dimensional structure of the battery cell in the battery cell module is shown.

[0045] Figure 8 for Figure 7 An exploded schematic diagram of the battery cell is shown.

[0046] Fig. 9 for Figure 4 A schematic diagram of the three-dimensional structure of the bracket in the battery pack shown in another perspective.

[0047] Fig.10 It is a schematic diagram of the three-dimensional structure of a battery pack bracket from another perspective in another embodiment of the present application.

[0048] Fig.11 for Figure 1 The battery pack shown is a schematic cross-sectional view along line MM with the cover removed.

[0049] Fig.12 for Figure 4 Schematic diagram of the decomposition of the detection parts in the battery module shown.

[0050] Fig.13 This is a schematic diagram of an exploded view of a battery pack in another embodiment of the present application.

[0051] Fig.14 for Figure 5 A schematic three-dimensional structure diagram of the first insulating member is shown.

[0052] Fig.15 for Fig.14 A schematic top view of the connection between the first insulating member and the battery core is shown.

[0053] Fig.16 for Fig.14 A side view schematic diagram of a first exhaust member and a battery cell stack is shown.

[0054] Fig.17 for Fig.16 Schematic diagram showing stacked battery cells and a first exhaust member provided with a first resin layer.

[0055] Fig.18 for Figure 5 A schematic three-dimensional structural diagram of the second insulating member is shown.

[0056] Fig.19 for Figure 5 A schematic three-dimensional structural diagram of a third insulating member is shown.

[0057] Fig. 20 for Figure 2 The schematic cross-sectional view of the battery cell module in the battery pack shown is along the NN line.

[0058] Fig.21 This is a top view schematic diagram of the connection between the first exhaust member and the battery cell in another embodiment of the present application.

[0059] Fig. 22 This is a schematic diagram of an exploded view of a battery cell module in a battery pack in another embodiment of the present application.

[0060] Main component symbols

[0061]

[0062] DETAILED DESCRIPTION

[0063] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0064] It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "located on" another component, it may be directly located on the other component or there may be a central component at the same time. The terms "top", "bottom", "upper", "lower", "left", "right", "front", "back", and similar expressions used herein are for illustrative purposes only.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0066] An embodiment of the present application provides a battery pack, including a cover plate, a battery cell module, a second resin layer and a battery pack shell, wherein the battery cell module is accommodated in the battery pack shell and fixed by the second resin layer, the cover plate is fixed to the battery pack shell, the battery cell module includes a plurality of battery cells, and the plurality of battery cells are stacked along a second direction, the battery cell module also includes a detection member, the detection member and the battery cell are arranged along the second direction, and the detection member is used to detect the degree of expansion of the battery cell module.

[0067] By adopting this battery pack, a detection member is provided on the battery cell module to detect the expansion degree of the battery cell module, thereby reducing the safety problems caused by excessive expansion of the battery cell module and improving the safety performance of the battery pack.

[0068] Some implementation methods will be described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0069] See also Figure 1 and Figure 2 The embodiment of the present application provides a battery pack 100, including a cover plate 10, a battery cell module 20, a second resin layer 30 and a battery pack shell 40, wherein the battery cell module 20 and the second resin layer 30 are arranged in the battery pack shell 40, and the second resin layer 30 fixes the battery cell module 20 in the battery pack shell 40, and the cover plate 10 is fixed to the battery pack shell 40 by fasteners, such as screws, and is used to cover the battery cell module 20 together with the battery pack shell 40 to protect the battery cell module 20. In one embodiment, the second resin layer 30 is formed by injecting resin into the battery pack shell 40 and then fixing it. In another embodiment, the second resin layer 30 includes a potting compound.

[0070] In order to better illustrate the structure of the battery pack 100 , the structure of the battery pack 100 will be described in conjunction with X, Y, and Z coordinate axes, wherein the X, Y, and Z coordinate axes are perpendicular to each other.

[0071] See also Figure 2 and Figure 3 The cover plate 10 is arranged on the battery pack housing 40 along the Z-axis direction. Specifically, the battery pack housing 40 and the cover plate 10 are arranged in sequence along the Z-axis direction. The cover plate 10 includes a plate body 11, and the plate body 11 is substantially rectangular. When the cover plate 10 is arranged on the battery pack housing 40, the plate body 11 is arranged on the upper surface of the battery cell module 20.

[0072] In one embodiment, the cover plate 10 further includes a protrusion 12 , and the protrusion 12 is disposed on a side of the plate body 11 close to the battery cell module 20 , so that the cover plate 10 can better contact the battery cell module 20 through the protrusion 12 .

[0073] In one embodiment, the cover plate 10 also includes an escape opening 13, and a partial structure of the battery cell module 20 can extend out of the battery pack shell 40 from the escape opening 13 to be exposed outside the cover plate 10 and the battery pack shell 40, so that the battery cell module 20 can be connected to the external environment, thereby facilitating the discharge of the gas generated by the battery cell module 20.

[0074] In one embodiment, the cover plate 10 further includes a first through hole 14. Along a first direction, the first through hole 14 and the avoidance opening 13 are disposed at opposite ends of the plate body 11. By providing the first through hole 14, a part of the structure of the battery cell module 20 can extend from the first through hole 14 and then be connected to an external structure (such as a circuit board) disposed on the cover plate 10. In this embodiment, the first direction is along the X-axis direction.

[0075] It can be understood that, in other embodiments, the shape of the plate body 11 is not limited thereto, and in battery packs 100 of different shapes, the shape of the plate body 11 can be changed according to different battery packs 100 .

[0076] See also Figure 4 and Figure 5 , the battery module 20 includes a plurality of stacked battery cells 21, a bracket 22 and a detection member 23, and the plurality of battery cells 21 are stacked along a second direction. In this embodiment, the second direction is along the Z-axis direction. In this embodiment, the second direction is the thickness direction of the battery cell 21. The bracket 22 is arranged at an upper position of the battery cell 21. In this embodiment, the bracket 22 is arranged above the battery cell 21 close to the cover plate 10. Further, the battery cell 21 close to the cover plate 10 is defined as a first battery cell M, and the bracket 22 is located between the cover plate 10 and the first battery cell M. The detection member 23 is arranged on the bracket 22. Further, the detection member 23 is arranged between the cover plate 10 and the bracket 22, and is used to detect the expansion degree of the battery module 20. When the expansion degree of the battery module 20 is greater than the safe expansion degree, it can be detected by the detection member 23, thereby improving the safety of the battery pack 100.

[0077] See also Figure 6 , Figure 7 and Figure 8 Specifically, the battery cell 21 includes an electrode assembly 211, a battery cell shell 212 and a metal part 213. The battery cell shell 212 is provided with a receiving portion 2121. The electrode assembly 211 is received in the receiving portion 2121 of the battery cell shell 212. The metal part 213 is connected to the electrode assembly 211 and extends from the battery cell shell 212. Along the second direction, the first battery cell M includes a first surface O and a second surface P that are oppositely disposed.

[0078] The battery cell shell 212 may have an insulating layer, a metal layer and an adhesive layer. The battery cell shell 212 is bonded to the electrode assembly 211 through the adhesive layer to achieve connection with the electrode assembly 211. The metal layer is located between the insulating layer and the adhesive layer, which can enhance the strength of the battery cell shell 212. The insulating layer is away from the electrode assembly 211, which can prevent external soda and water from penetrating into the interior. The metal part 213 is used to connect to the external structure so that the battery cell 21 can be connected to the external structure. In addition, the metal parts 213 of two adjacent battery cells 21 are connected to achieve electrical connection between the multiple battery cells 21. In this embodiment, the metal part 213 is a pole ear, which is divided into a positive pole ear and a negative pole ear, and the positive and negative pole ears of two adjacent battery cells 21 are connected.

[0079] The battery cells 21 are arranged along the first direction, and the metal portion 213 extends from the battery cell housing 212 along the first direction.

[0080] Along the first direction, the battery cell 21 includes a first end A and a second end B that are oppositely arranged, the first end A is an end extending from the metal part 213, and the second end B is an end away from the metal part 213. In this embodiment, the metal part 213 includes two, and the two metal parts 213 extend from the first end A of the battery cell 21 to the battery cell housing 212. In other embodiments, one of the two metal parts 213 can extend from the first end A of the battery cell 21 to the battery cell housing 212, and the other metal part 213 can extend from the second end B of the battery cell 21 to the battery cell housing 212. In this embodiment, at the second end B, the battery cell 21 includes a first surface 214 and a second surface 215, and the first surface 214 and the second surface 215 are not in the same plane. Along the first direction, the first surface 214 is closer to the first end A than the second surface 215. In one embodiment, the second surface 215 can be used as a reference when setting other components on the battery cell module 20, so that the overall structure of the battery cell module 20 is smoother, which facilitates the assembly of the battery cell module 20 into the battery pack housing 40.

[0081] See also Figure 4 , Figure 5 and Fig. 9, the bracket 22 is mounted above the first battery cell M, and the bracket 22 includes a main body 221, and the main body 221 is roughly a rectangular plate structure. Along the third direction, the distance extended by the main body 221 is roughly the same as the distance extended by the battery cell 21. In this embodiment, the third direction is along the Y-axis direction. Among them, the meaning of "roughly" is not absolutely equivalent, and there may be a deviation of + / -5mm to + / -10mm between the two. In one embodiment, there is a first gap (not shown in the figure) between the main body 221 and the first battery cell M. When the battery pack shell 40 is glued, the second resin layer 30 flows into the first gap to strengthen the fixing strength between the main body 221 and the first battery cell M.

[0082] In one embodiment, the bracket 22 further includes a plurality of protrusions 222, which are spaced apart on a side of the main body 221 close to the first battery cell M, and the protrusions 222 extend toward the first battery cell M by a first distance, so that the protrusions 222 extend out of the main body 221, and the protrusions 222 and the main body 221 form a groove 223, and the groove 223 is connected to the first gap. By providing the protrusions 222, the strength of the main body 221 can be increased. At the same time, please refer to Fig.11 When the battery cell module 20 is disposed in the battery pack housing 40, the second resin layer 30 can be disposed between the main body 221 and the battery cell 21, and the second resin layer 30 is disposed at the groove 223, thereby making the stability between the bracket 22 and the battery cell 21 stronger.

[0083] In one embodiment, the bracket 22 further includes a fixing portion 224, and the fixing portion 224 is connected to the side of the main body 221 along the third direction. In one embodiment, the fixing portion 224 includes two fixing portions 224, and the two fixing portions 224 are connected to the opposite sides of the main body 221. In this embodiment, the fixing portion 224 is vertically arranged with the main body 221, and in other embodiments, the fixing portion 224 and the main body 221 can be arranged at other angles. The bracket 22 is fixed in the battery pack housing 40 by the fixing portion 224, so as to pre-position the bracket 22 and reduce the movement of the bracket 22 caused by the flow of the second resin layer 30 during the process of glue filling the battery module 20. In one embodiment, the fixing portion 224 is provided with a fixing hole 225, and the fixing portion 224 is buckled on the inner wall of the battery pack housing 40 through the fixing hole 225 to achieve the pre-positioning of the bracket 22.

[0084] The fixing portion 224 is snap-fitted to the battery pack housing 40 so that when the battery cell 21 expands, the bracket 22 can be moved more conveniently. When the second resin layer 30 fixes the battery module 20, there is less second resin layer 30 at the fixing hole 225, and the fixing degree is low, which does not affect the movement of the bracket 22.

[0085] It is understood that in other embodiments, the number and location of the fixing parts 224 are not limited thereto. For example, the fixing parts 224 may be six or eight, etc. The shape of the main body 221 is also not limited thereto.

[0086] In one embodiment, the battery module 20 includes the bracket 22, and the bracket 22 is arranged above the first battery M along the second direction. The first surface O of the first battery M may be uneven. By providing the bracket 22, the detection member 23 is arranged on the bracket 22, so that the detection member 23 is located on a flat surface, thereby improving the detection accuracy of the detection member 23.

[0087] It is understandable that, in other embodiments, the bracket 22 may also be disposed between two adjacent battery cells 21 , and is not limited to being disposed above the first battery cell M as described above.

[0088] See also Fig.10 In another embodiment, a bracket 22 is further provided, and the bracket 22 includes a main body 221, a convex portion 222, and a fixing portion 224. The convex portion 222 is disposed on a surface of the main body 221 close to the first battery cell M, so that a first gap exists between the main body 221 and the first battery cell M, and the second resin layer 30 can be disposed between the main body 221 and the first battery cell M. The fixing portion 224 has the same structure as the fixing portion 224 in the above embodiment. No further description will be given here.

[0089] See also Figure 4 , Figure 5 and Fig.12 The detection member 23 is used to detect the expansion degree of the battery module 20 and transmit the detected information. The detection member 23 includes a first detection part 231, a second detection part 232 and a guide line 234. The first detection part 231 is arranged on the surface of the bracket 22 close to the cover plate 10, and the second detection part 232 is arranged on the first detection part 231. The guide line 234 is connected to the first detection part 231. When the first detection part 231 and the second detection part 232 are connected, information is transmitted through the guide line 234.

[0090] In one embodiment, the first detection portion 231 and the second detection portion 232 each include a thin film sheet, and a conductive silver paste is disposed on the thin film sheet. The conductive silver paste can serve as the conductive portion of the first detection portion 231 and the second detection portion 232 .

[0091] The detection member 23 further includes a first adhesive area 233, which is provided at a portion of the first detection portion 231 close to an edge, and is coated with a structure such as glue or double-sided tape at the position, so that the first detection portion 231 and the second detection portion 232 can be connected through the first adhesive area 233. The first adhesive area 233 is coated with glue, so that a gap is formed between the first detection portion 231 and the second detection portion 232 in areas other than the first adhesive area 233, for example, a gap of 0.2 mm is formed.

[0092] When the battery module 20 expands, the first battery M pushes the second resin layer 30, and the second resin layer 30 pushes the bracket 22, and the bracket 22 drives the first detection part 231 to approach the second detection part 232 until the two are connected. After the connection, the conductive silver paste on the first detection part 231 and the second detection part 232 are in contact, forming a conductive loop, and connected to the external structure through the guide wire 234, thereby transmitting the information that the first detection part 231 and the second detection part 232 are connected.

[0093] In one embodiment, the cover plate 10 is provided with a protrusion 12. In order to make the detection effect of the detection member 23 more accurate, the setting position of the protrusion 12 corresponds to the detection member 23. When the battery cell 21 expands, the protrusion 12 can abut against the second detection member 232, so that the first detection member 231 and the second detection member 232 are more easily connected, thereby improving the accuracy of the detection member 23.

[0094] In this embodiment, when the first detection part 231 and the second detection part 232 are not connected, the resistance of the guide wire 234 can be considered to be infinite. When the battery cell 21 expands abnormally, the first detection part 231 and the second detection part 232 can be connected to form a complete circuit. The resistance of the guide wire 234 drops rapidly, so that it can respond and detect in time, thereby improving the safety of the battery pack 100.

[0095] It is understandable that in other embodiments, the detection form of the detection element 23 is not limited to the detection of resistance. For example, it can also be a detection method that can respond promptly after the first detection part 231 and the second detection part 232 are turned on, or other detection forms with equivalent effects or functions are applicable.

[0096] In one embodiment, the detection member 23 and the bracket 22 may also be disposed between two adjacent battery cells 21 .

[0097] In one embodiment, the expansion degree of the battery cell 21 can be set. For example, the expansion degree of the battery cell 21 greater than 15% can be used as a critical value. It is understandable that a larger expansion critical value can also be selected so that the probability of false triggering can be reduced during the use of the battery pack 100. In a specific embodiment, the normal expansion degree of the battery cell 21 is 0-20%. There is a gap between the first detection part 231 and the second detection part 232, which allows the battery cell 21 to expand further. In one embodiment, the gap allows the battery cell 21 to expand another 5%. When the battery cell 21 expands to 20%, the first detection part 231 and the second detection part are connected and conductive.

[0098] See also Figure 6 In one embodiment, the detection member further includes a support portion 235. When the battery module 20 expands, the first detection portion 231 and the second detection portion 232 move along the second direction, and the guide wire 234 will be pulled during the movement. Since the second resin layer 30 fixes the guide wire 234, the first detection portion 231 and the second detection portion 232 may break the guide wire 234 during the movement. In order to reduce the occurrence of this situation, the support portion 235 is provided on the side of the guide wire 234 close to the bracket 22, and the support portion 235 is located between the guide wire 234 and the bracket 22 to increase the height of the guide wire 234 along the second direction. The guide wire 234 is raised higher. When the battery module 20 expands, the first detection portion 231 and the second detection portion 232 move, and the guide wire 234 can move together, reducing the occurrence of breaking the guide wire 234. In one embodiment, there is a first distance d between the support portion 235 and the first detection portion 231 and the second detection portion 232 along the third direction. This arrangement can make the first detection portion 231 and the second detection portion 232 more flat. When the abnormal expansion of the battery cell 21 is detected, the battery cell module 20 disconnects the electrical conduction between the battery cells 21 to reduce the continued use of the battery cells 21. It is also possible that after the detection member 23 is turned on, the battery cell module 20 is fused to form an open circuit of the battery pack 100, which can no longer be used.

[0099] See also Figure 6 In one embodiment, in order to make it easier for the detection member 23 to detect the expansion of the battery cell 21, the detection member 23 is arranged close to the second end B of the battery cell 21. In a specific embodiment, along the first direction X, the distance from the second end B to the first end A is L, and the detection member 23 can be arranged at a distance of 1 / 4 to 1 / 3L from the second end B along the first direction X. The position of the bracket 22 arranged on the first battery cell M can be adjusted according to the setting position of the detection member 23. The first end A of the battery cell 21 is provided with a metal part 213, and the metal part 213 needs to be connected to an external structure to achieve electrical conduction of the battery cell 21, and the second end B is not connected to any external structure.

[0100] The second resin layer 30 fixes the battery module 20 in the battery pack housing 40, the metal part 213 is connected to the external structure, the first end A is fixed by the second resin layer 30, and the second resin layer 30 provided at the second end B is less than the second resin layer 30 provided at the first end A, so that the bonding strength of the second end B is weaker than that of the first end A, and the mechanical strength of the first end A is greater than that of the second end B, so the second end B is more likely to expand relative to the first end A. In order to reduce the second end B from shaking due to less glue injection, an insulating component 26 can be provided at the second end B to reduce the shaking of the second end B.

[0101] The second resin layer 30 is provided on the surface of the battery module 20. In order to more easily detect whether the battery module 20 has expanded, the second end B is incompletely filled with glue to make it easier to move the second end B. The detection member 23 is arranged near the second end B, which makes it easier to detect the expansion degree of the battery module 20.

[0102] In one embodiment, when the second resin layer 30 fixes the battery cell module 20, the second resin layer 30 is arranged between the bracket 22 and the first battery cell M. Furthermore, the second resin layer 30 can also be arranged on the surface of the bracket 22 facing away from the first battery cell M, and the first surface O of the first battery cell M is also completely provided with the second resin layer 30, so that when the battery cell 21 pushes the bracket 22 through the second resin layer 30 during the expansion process, the overall force of the bracket 22 is more uniform, the transmission of the pushing force is also more uniform, and the detection of the detection component 23 is more accurate.

[0103] In addition to the bracket 22 being fixed by the second resin layer 30, the detection member 23 needs to be exposed outside the second resin layer 30 to reduce the second resin layer 30 fixing the detection member 23, so that the first detection part 231 and the second detection part 232 of the detection member 23 cannot move.

[0104] See also Fig.13 Another embodiment of the present application further provides a detection member 23. In another embodiment, the detection member 23 includes a first detection portion 231, a second detection portion 232 and a connection portion 236. When the first detection portion 231 is disposed on the bracket 22, the first detection portion 231 is disposed on the surface of the bracket 22 close to the cover plate 10, and the second detection portion 232 is disposed on the surface of the cover plate 10 close to the battery cell 21. When the battery cell module 20 is not provided with the bracket 22, the first detection portion 231 is disposed on the surface of the first battery cell M close to the cover plate 10, and the second detection portion 232 is disposed on the surface of the cover plate 10 close to the first battery cell M. The second detection part 232 is provided with a connecting part 236, and the connecting part 236 extends from the second detection part 232 toward the first detection part 231. The connecting part 236 can move relative to the second detection part 232 and can form an electrically conductive state with the second detection part 232. The second detection part 232 is provided with a guide wire 234, and information is transmitted through the guide wire 234.

[0105] When the battery cell 21 is not expanded under normal circumstances, there is a gap between the first detection part 231 and the second detection part 232. When the battery cell 21 expands abnormally, the battery cell 21 supports the first detection part 231, or supports the first detection part 231 through the bracket 22 to connect with the connecting part 236 on the second detection part 232. After the first detection part 231 and the connecting part 236 are connected, the first detection part 231 pushes the connecting part 236 to move, so that the connecting part 236 and the second detection part 232 are connected, and the second detection part 232 forms an electrical conduction state, and the conduction information is transmitted through the guide wire 234 to achieve the purpose of detection.

[0106] In this embodiment, the first detection portion 231 is an insulating sheet, the second detection portion 232 is a travel switch, and the connecting portion 236 is a contact on the travel switch.

[0107] It is understandable that the form of the detection member 23 is not limited to the above-mentioned film sheet detection or travel switch detection. In other embodiments, the detection member 23 can also be replaced by, for example, a metal sheet detection form.

[0108] See also Figure 4 and Figure 5 In one embodiment, the battery cell module 20 further includes a support member 24, and the support member 24 is disposed at the connection position of the metal parts 213 of the two adjacent battery cells 21. Specifically, after the metal parts 213 of the two adjacent battery cells 21 are connected, a receiving groove (not shown in the figure) is formed between the metal parts 213, and the support member 24 is disposed in the receiving groove. The support member 24 is disposed in the receiving groove, which can support and fix the metal part 213. At the same time, the support member 24 can separate the unconnected metal parts 213 between the two adjacent battery cells 21, thereby reducing the short circuit between the battery cells 21 caused by their contact.

[0109] In one embodiment, the support member 24 is foam. It is understandable that in other embodiments, the support member 24 can also be replaced by other structures with equivalent functions or effects.

[0110] See also Figure 4 and Figure 5 In one embodiment, the battery cell module 20 also includes a switching component 25, which is arranged at the first end A of the battery cell 21, and is used to connect the metal part 213 and the guide line 234, so that the metal part 213 and the guide line 234 can be connected to an external structure to monitor the internal voltage and other data of the battery cell 21, and after receiving the information transmitted by the guide line 234, to start the protection mechanism of the battery cell 21.

[0111] The adapter assembly 25 includes an adapter plate 251, an adapter member 252 and a stopper 253. The adapter plate 251 is provided at the first end A of the battery cell 21. When viewed along the third direction, the guide wire 234 extends from the first detection portion 231, extends along the side of the battery cell 21 toward the adapter plate 251, and is electrically connected to the adapter plate 251. The "side" of the battery cell 21 refers to the position close to the edge between the first end A and the second end B of the battery cell 21. The adapter member 252 is provided on the adapter plate 251 and is electrically connected to the adapter plate 251. The stopper 253 is used to limit the adapter member 252 provided on the adapter plate 251 to reduce the movement of the adapter member 252.

[0112] In one embodiment, the adapter plate 251 is a circuit board. In one embodiment, the adapter 252 is a copper bar, and further, the copper bar can be divided into a total positive copper bar and a total negative copper bar, the total positive copper bar is connected to the positive electrode ear on the battery cell 21 away from the cover plate 10, and the total negative copper bar is connected to the negative electrode ear on the battery cell 21 close to the cover plate 10, and the limiter 253 limits the total positive copper bar. In one embodiment, the limiter 253 is a limit foam.

[0113] It is understandable that in other embodiments, the positive and negative tabs of the total positive copper bar and the total negative copper bar connected to the battery cell 21 can be replaced. The stopper 253 can also be replaced with a structure having the same function or effect.

[0114] See also Figure 4 and Figure 5 In one embodiment, in order to reduce the second resin layer 30 poured into the battery pack housing 40, an insulating component 26 may be provided at the second end B of the battery cell 21. On the one hand, the second end B of the battery cell 21 is easy to move, which improves the accuracy of detecting the expansion degree of the battery cell module 20, and on the other hand, reduces the cost required for the battery pack 100. The insulating component 26 and the second end B of the battery cell 21 form a first space 265, and the first space 265 is connected to the gap between at least two battery cells 21. The insulating component 26 closes one side of the first space 265, and one side of the first space 265 is away from the battery cell 21 in the opposite direction of the first direction. The insulating component 26 and the first space 265 form an exhaust channel, and the exhaust channel is connected to the atmosphere outside the battery pack 100.

[0115] The battery pack 100 includes a first resin layer 262, which is disposed at the second end B of the battery cell 21. The first resin layer 262 is in a hollow rectangular shape. When disposed on the battery cell 21, the second resin layer 30 can be reduced from entering the hollow portion thereof. The insulating component 26 is disposed on the surface of the first resin layer 262 to seal the hollow portion of the first resin layer 262. This arrangement reduces the amount of the first resin layer 262 and the amount of the second resin layer 30, so that the battery cell module 20 can be fixed while reducing the cost of the battery pack 100.

[0116] In one embodiment, when the battery pack 100 is in a harsh environment, such as a high temperature environment, the air pressure inside and outside the battery pack 100 is different, which may cause safety problems. The battery cell module 20 may also be vented through the insulating component 26. For example, the insulating component 26 may be used to discharge the gas generated by the battery cell 21 or the gas generated by other structures inside the battery pack 100.

[0117] The first resin layer 262 and the insulating assembly 26 together form an exhaust channel, and the exhaust channel is connected to the outside of the battery pack 100, so as to achieve the purpose of exhausting the internal structure of the battery pack 100.

[0118] See also Figure 4 and Fig.14 The battery pack 100 includes a first insulating member 261, which is disposed between two adjacent battery cells 21. The first insulating member 261 is provided with double-sided adhesive tape on two opposite surfaces thereof, so that the first insulating member 261 can be bonded to the surface of the battery cell 21, so that the adjacent battery cells 21 can be fixed in pairs to form a stable battery cell module 20. The first space 265 is at least formed between the two adjacent battery cells 21 and the insulating component 26. In one embodiment, the first insulating member 261 is foam. By arranging foam between two adjacent battery cells 21, if the battery cell 21 expands, the foam can provide deformation space for the battery cell 21, thereby reducing the direct mutual compression of the two adjacent battery cells 21, or the compression of the battery cell 21 and the cover plate 10 or the battery pack shell 40, which causes the cover plate 10 or the battery pack shell 40 to rupture.

[0119] It is understandable that, in other embodiments, the first insulating member 261 may be replaced by other structures having equivalent functions or effects. The double-sided adhesive tape may also be replaced by other forms of adhesive, such as liquid glue.

[0120] The first insulating member 261 is provided with a second through hole 2611. In one embodiment, the second through hole 2611 is substantially rectangular, so that the shape of the second through hole 2611 is substantially the same as the shape of the battery cell 21, so that it can be better adapted to the battery cell 21. By providing the second through hole 2611 in the first insulating member 261, the battery cell 21 can have more space to expand at the position of the second through hole 2611. For example, the expansion range of the battery cell 21 can be set by the space provided by the second through hole 2611. At the same time, the amount of the first insulating member 261 can be reduced, thereby reducing the cost of the battery pack 100.

[0121] In one embodiment, the weak point of the battery cell 21 is on the first surface O or the second surface P. Here, the “weak point” refers to a position in the battery cell 21 that is more easily broken.

[0122] See also Figure 8 and Fig.15In one embodiment, when viewed in a direction opposite to the second direction, the minimum projection area of ​​the first insulating member 261 on the battery cell 21 is the area of ​​the electrode assembly 211, and the maximum projection area is the area of ​​the battery cell housing 212. In one embodiment, the projection area of ​​the first insulating member 261 on the battery cell 21 is set between the maximum projection area and the minimum projection area. By setting the size of the first insulating member 261 in this way, on the one hand, it is reduced that when the second resin layer 30 is filled into the stacked battery cells 21, the second resin layer 30 enters between two adjacent battery cells 21 from the side of the battery cell 21, and the first insulating member 261 cannot be compressed; on the other hand, it is also easier to assemble the battery cell module 20 into the battery pack housing 40, reducing the difficulty of assembly.

[0123] In one embodiment, in order to facilitate the first insulating member 261 to exhaust the battery cell 21, a portion of the first insulating member 261 near the second end B of the battery cell 21 is not provided with double-sided tape, so that the first insulating member 261 in this portion is not bonded to the battery cell 21, so that gas can pass through the gap between the first insulating member 261 and the battery cell 21. Specifically, the portion of the first insulating member 261 not provided with double-sided tape, such as Fig.15 The part shown by the dotted line.

[0124] See also Fig.16 The first insulating member 261 is disposed between the stacked battery cells 21. When viewed from the direction opposite to the first direction, the end of the first insulating member 261 is flush with the first surface 214 at the second end B of the battery cell 21. The end of the first insulating member 261 is flush with the second surface 215, which can effectively reduce the second resin layer 30 from entering between the battery cells 21 and affecting the normal expansion of the battery cells 21, and facilitates the assembly between the battery cells 21 and the battery pack housing 40.

[0125] In one embodiment, the Shore C hardness of the first insulating member 261 is in the range of 38°+ / -5°. Setting the hardness of the first insulating member 261 within this range, on the one hand, facilitates the compression of the first insulating member 261, and reduces the possibility that the first insulating member 261 cannot be compressed when the battery cell 21 squeezes the first insulating member 261 due to its high hardness; on the other hand, it makes it easier to control the size of the stacked battery cell 21 and the first insulating member 261, and reduces the possibility that the first insulating member 261 is easily deformed due to its low hardness.

[0126] In one embodiment, the first insulating member 261 is made of an elastic closed-cell material. This material enables the first insulating member 261 to be deformed to provide a deformation space for the expansion of the battery core 21 , while preventing glue from seeping in, thereby effectively ensuring that the second resin layer 30 cannot enter between two adjacent battery cores 21 .

[0127] See also Fig.17 The stacked battery cells 21 are provided with the first resin layer 262 at the second end B. In this embodiment, when viewed along the first direction, the first resin layer 262 is substantially in a hollow rectangular shape. The first resin layer 262 is formed by placing liquid resin at the second end B of the battery cell 21 and then fixing it. Fig.16 At the second end B of the battery cell 21, the first surface 214 and the second surface 215 are at different distances from the first end A. By setting the first resin layer 262, the groove (not shown) between the first surface 214 and the second surface 215 is filled to reduce the second resin layer 30 flowing to the first surface 214 and the second surface 215 during subsequent glue pouring, thereby affecting the exhaust of the battery cell module 20.

[0128] It is understandable that the first resin layer 262 is configured to be a hollow rectangular shape according to the stacked battery cells 21. It is understandable that in other embodiments, when the battery cells 21 are replaced with other stacked shapes, the shape of the first resin layer 262 also changes accordingly.

[0129] See also Figure 5 and Fig.18 In order to further reduce the infusion of the second resin layer 30, the insulating assembly 26 includes a second insulating member 263 and a third insulating member 264. The second insulating member 263 is provided on the surface of the first resin layer 262. When viewed along the first direction, the second insulating member 263 covers the first resin layer 262. The second insulating member 263 is provided with an adhesive structure (not shown) such as a double-sided adhesive on the surface close to the first resin layer 262, so that the second insulating member 263 can be bonded to the battery cell 21 through the double-sided adhesive.

[0130] The second insulating member 263 includes a first body 2631, which is also roughly rectangular. The first body 2631 is provided with a third through hole 2632, which is rectangular and has a length along the second direction, so that the third through hole 2632 can be connected to the gap between the plurality of battery cells 21 and the first insulating member 261 to achieve the purpose of exhaust.

[0131] In one embodiment, the second insulating member 263 further includes a first portion 2633 , which extends from the first body 2631 along the second direction. When the battery cell module 20 is assembled with the cover plate 10 , the first portion 2633 is at least partially located at the first through hole 14 of the cover plate 10 .

[0132] In one embodiment, the second insulating member 263 is foam. It is understood that in other embodiments, the second insulating member 263 can also be replaced by other structures with equivalent functions or effects. The shape of the second insulating member 263 is not limited thereto, and the shape of the second insulating member 263 can be replaced accordingly according to the different stacking conditions of the battery cells 21.

[0133] See also Figure 5 and Fig.19 The third insulating member 264 is disposed on a surface of the second insulating member 263 that is away from the first resin layer 262 , and the structures of the third insulating member 264 and the second insulating member 263 are substantially the same.

[0134] Please also see Fig. 20 The third insulating member 264 includes a second body 2641 and a second portion 2642. The second portion 2642 extends from the second body 2641 along the second direction. The second body 2641 and the second portion 2642 correspond to the first body 2631 and the first portion 2633, respectively. The first portion 2633 can support and fix the second portion 2642. An exhaust groove 2643 is provided on the second body 2641 and the second portion 2642. When the third insulating member 264 is connected to the second insulating member 263, the exhaust groove 2643 is connected to the second through hole 2611 to form an exhaust channel, and the gas is discharged from the exhaust groove 2643 to the outside of the battery pack.

[0135] In one embodiment, when the cover plate 10 is assembled with the battery module 20, the distance that the first portion 2633 and the second portion 2642 extend beyond the cover plate 10 along the second direction is greater than 2 mm, so as to reduce the second resin layer 30 from entering the exhaust channel, resulting in a situation where exhaust and pressure relief are impossible. The depth of the exhaust groove 2643 in the direction opposite to the first direction is less than or equal to 0.2 mm, and the distance of the exhaust groove 2643 along the third direction is between 1 mm and 3 mm. The size of the exhaust groove 2643 is set in this way, so that the exhaust groove 2643 can play a dustproof role and reduce dust and other impurities from blocking the exhaust channel.

[0136] The second body 2641 is provided with a second adhesive area 2644, which is provided at the edge of the second body 2641. By providing an adhesive structure such as double-sided tape (not shown) on the second adhesive area 2644, the third insulating member 264 and the second insulating member 263 are connected.

[0137] In one embodiment, the third insulating member 264 may be made of polycarbonate (PC) material. It is understood that the material of the third insulating member 264 is not limited thereto, and in other embodiments, other structures with equivalent functions or effects may also be used.

[0138] It can be understood that, in other embodiments, the second insulating member 263 and the third insulating member 264 can be an integrally formed structure, and an exhaust groove 2643 is provided between the two, and the exhaust groove 2643 and the third through hole 2632 are connected.

[0139] When the insulating component 26 is arranged on the stacked battery cells 21, the battery cells 21 and the first insulating member 261 are first spaced apart and stacked, and then the first resin layer 262 is arranged at the second end B of the stacked battery cells 21 until the first resin layer 262 is cured and fixed to the second end B of the battery cells 21, and then the second insulating member 263 is arranged on the first resin layer 262, and finally the third insulating member 264 is arranged on the second insulating member 263 to complete the assembly between the insulating component 26 and the battery cells 21.

[0140] See also Fig.21 and Fig. 22 In another embodiment, an opening 2612 is provided on the first insulating member 261 near the second end B of the battery cell 21 , and the first insulating member 261 is bonded to the surface of the battery cell 21 .

[0141] Then, the second insulating member 263 is bonded to the second end B of the battery cell 21, so that the opening 2612 is connected to the third through hole 2632, that is, the opening 2612 is connected to the first space 265. Then, the first resin layer 262 is arranged along the edge of the third through hole 2632. In this embodiment, the first resin layer 262 is roughly formed into a frame-shaped structure, wherein "similar" means that it looks similar. In fact, a first resin layer 262 with a thickness is arranged at the edge of the third through hole 2632, which can reduce the second resin layer 30 from flowing into the third through hole 2632 and affecting the exhaust. Finally, the third insulating member 264 is arranged on the second insulating member 263, and the exhaust groove 2643 is connected to the third through hole 2632 to form a complete exhaust channel, which is convenient for exhausting the battery cell module 20.

[0142] Furthermore, when the first insulating member 261 is foam, the foam and the double-sided adhesive tape on the foam will decompose and generate gas in a high temperature environment, and the second through hole 2611 provided on the first insulating member 261 reduces the amount of the first insulating member 261 and also reduces the generation of gas. The gas generated by the foam and the double-sided adhesive tape on the foam is also discharged through the exhaust channel.

[0143] See also Figure 4 and Figure 5 In one embodiment, the battery pack 100 further includes a buffer 27, and the buffer 27 is disposed on the side of the battery cell module 20 along the third direction. In one embodiment, the buffer 27 is disposed on the guide wire 234 and is located on the side of the battery cell module 20. Providing the buffer 27 on the guide wire 234 can fix the guide wire 234, reduce the movement of the guide wire 234 caused by the expansion of the battery cell 21, and affect the accuracy of the information transmitted by the guide wire 234. At the same time, it can also play a buffering role for the battery cell module 20. When the battery pack 100 vibrates, the buffer 27 can reduce the direct collision between the battery cell module 20 and the battery pack housing 40, thereby reducing the damage to the battery cell 21.

[0144] In one embodiment, the buffer member 27 is foam. It is understandable that in other embodiments, the buffer member 27 can also be replaced by other structures with equivalent functions or effects.

[0145] See also Figure 4 In one embodiment, the battery pack 100 further includes a rubber pad 28, which is disposed between the battery cell module 20 and the battery pack shell 40 along the second direction, and is used to protect the battery cell 21 and reduce the possibility that the battery cell 21 hits the battery pack shell 40 and becomes deformed when the battery cell module 20 is assembled in the battery pack shell 40.

[0146] In one embodiment, the rubber pad 28 is a silicone pad 28. It is understandable that in other embodiments, the rubber pad 28 can also be replaced by other structures with equivalent functions or effects, for example, foam can be provided to protect the battery cell 21.

[0147] See also Figure 2The battery pack 100 further includes a circuit board 29, which is disposed on the surface of the cover plate 10 away from the battery module 20, the adapter 252 in the adapter assembly 25 is connected to the circuit board 29, and the adapter board 251 is connected to the circuit board 29 by wire connection or other connection methods. In one embodiment, the circuit board 29 is a Battery Management System board (BMS board), which is used to control the voltage and other data on the battery cell 21, and to respond to the circuit of the battery cell 21 in time after receiving the information transmitted by the guide line 234, so as to ensure the safety of the battery cell 21.

[0148] See also Figure 2 The second resin layer 30 is formed by being fixed on the side of the battery cell 21 by means of infusion, and is used to fix the plurality of battery cells 21. After the battery cell 21 is encapsulated with the electrode assembly 211 by the battery cell shell 212, the plurality of battery cells 21 are fixed by the second resin layer 30 at the side sealing position of the battery cell shell 212, that is, the second resin layer 30 is filled at the position where there is a gap between the sides of two adjacent battery cells 21, so that the two adjacent battery cells 21 are bonded and fixed by the second resin layer 30. In one embodiment, the side of the battery cell 21 may also be the peripheral position of the outer contour of the battery cell 21, so that the second resin layer 30 is more firmly fixed when fixing the battery cell 21. Furthermore, when assembling the bracket 22 onto the battery cell module 20, it is installed when the second resin layer 30 is not completely fixed.

[0149] The second resin layer 30 may be injected by glue or injection molding, for example, low-pressure injection molding. In this embodiment, the second resin layer 30 is a potting glue, which can play the role of bonding, sealing, potting and coating protection of components. In one embodiment, the second resin layer 30 is an epoxy resin potting glue. It is understandable that in other embodiments, the second resin layer 30 can also be replaced by other types of potting glue.

[0150] Please refer to Figure 2The battery pack housing 40 accommodates the battery cell module 20, and the second resin layer 30 is disposed between the battery cell module 20 and the battery pack housing 40. For example, the second resin layer 30 is a potting glue, which is poured between the battery cell module 20 and the battery pack housing 40 by pouring. After the potting glue is fixed, a solid second resin layer 30 is formed. The second resin layer 30 adheres and fixes the battery cell module 20 and the battery pack housing 40 together to strengthen the structural strength of the battery pack 100. The cover plate 10 is fixedly connected to the battery pack housing 40. For example, the cover plate 10 is mounted on the battery pack housing 40 by fasteners, such as screws, to protect the battery cell module 20 disposed in the battery pack housing 40.

[0151] The battery pack housing 40 is generally a hollow rectangular structure without an upper cover, including four side walls 41 and a bottom wall 42, and the four side walls 41 and the bottom wall 42 enclose a receiving space 43, and the battery cell module 20 is arranged in the receiving space 43. Further, the cover plate 10 and the battery pack housing 40 jointly cover the battery cell module 20, and the shape of the battery pack housing 40 is set according to a plurality of battery cells 21 stacked along the second direction. In one embodiment, the insulating component 26 is arranged between the second end B of the battery cell 21 and the side wall 41 away from the metal part 213.

[0152] It is understandable that, in other embodiments, the shape of the battery pack housing 40 is not limited thereto. For example, when the battery cell module 20 is circular, the shape of the battery pack housing 40 can be replaced according to the shape of the battery cell module 20 .

[0153] It is understandable that, in other embodiments, the fixing method of the cover plate 10 and the battery pack shell 40 is not limited thereto, and for example, it can also be replaced by a snap-on fixing connection method, or adhesive can be applied to the corresponding edge positions of the cover plate 10 and the battery pack shell 40 to fix the two together with the adhesive.

[0154] The embodiment of the present application further provides an electric device (not shown), the electric device comprising a main body and a battery pack 100 in any of the above embodiments, the battery pack 100 being disposed in the main body. For example, the electric device may be an electric vehicle, an electric bus, an electric vehicle, an energy storage device, an electric bicycle, a flying device, etc. Correspondingly, when the electric device is an electric vehicle, the main body is a vehicle body structure, and the battery pack 100 is disposed in the vehicle body structure for power supply.

[0155] It is understandable that, in other embodiments, the electrical device may also be a handheld electric device, such as a vacuum cleaner, a lawn mower, etc.

[0156] In summary, the battery pack 100 and the electrical device are provided in the embodiment of the present application. The detection member 23 is provided on the battery cell 21 to detect whether the expansion degree of the battery cell module 20 exceeds the safe expansion range. When the expansion degree of the battery cell module 20 exceeds the safe expansion range, the detection member 23 responds in time to protect the battery pack 100 and reduce the occurrence of safety problems. At the same time, an insulating component 26 is provided on the battery cell module 20, and the exhaust channel formed by the insulating component 26 is connected to the external atmosphere, so that the gas generated inside the battery pack 100 can be discharged to the outside, balancing the internal and external pressures of the battery pack 100 and solving the risks caused by unbalanced air pressure.

[0157] In addition, those skilled in the art should recognize that the above embodiments are only used to illustrate the present application, and are not intended to limit the present application. As long as they are within the spirit of the present application, appropriate changes and modifications to the above embodiments are within the scope of the present application.

Claims

1. A battery pack, comprising a cover plate, a battery cell module, a second resin layer and a battery pack shell, wherein the battery cell module is accommodated in the battery pack shell and fixed by the second resin layer and the battery pack shell, and the cover plate is fixed to the battery pack shell, characterized in that: The battery cell module includes a plurality of battery cells, and the plurality of battery cells are stacked along a second direction; The battery cell module further includes a detection member, the detection member and the battery cell are arranged along the second direction, and the detection member is used to detect the expansion of the battery cell module; The second resin layer is configured to be formed by injecting resin into the battery pack housing and then fixing it; the battery cell module also includes a bracket located above the battery cell module, and the detection member is arranged on a side of the bracket away from the battery cell module; The bracket includes a main body and a fixing part connected to the main body, the fixing part is provided with a fixing hole, the fixing part is buckled on the inner wall of the battery pack shell through the fixing hole, and the second resin layer fixes the fixing part and the battery pack shell.

2. The battery pack according to claim 1, wherein: The detection member includes a first detection part, a second detection part and a guide line, the first detection part is arranged on the surface of the bracket close to the cover plate, the second detection part is arranged on the first detection part, and the guide line is connected to the first detection part for transmitting information.

3. The battery pack according to claim 2, characterized in that: The detection member further includes a first bonding area, which is disposed on the first detection portion and is used to connect the first detection portion and the second detection portion, and a gap is formed between the first detection portion and the second detection portion.

4. The battery pack according to claim 3, characterized in that: The battery pack further includes a supporting portion disposed between the guide wire and the bracket.

5. The battery pack according to claim 3, characterized in that: The detection member includes a first detection part, a second detection part and a connecting part, the first detection part is arranged on the bracket, the second detection part is arranged on the cover plate, and the connecting part is located between the first detection part and the second detection part and can move relative to the second detection part.

6. The battery pack according to claim 1, wherein: The battery cell includes a first end and a second end that are arranged opposite to each other, and the battery cell includes a metal part arranged at the first end. The battery cell module also includes a switching component, which is arranged at the first end of the battery cell and connects the battery cell and the detection component.

7. The battery pack according to claim 6, characterized in that: The adapter assembly includes an adapter plate, an adapter member and a limiting member. The adapter plate is arranged at the first end of the battery cell, the adapter member is arranged on the adapter plate, and the limiting member is arranged on the adapter member for limiting the adapter member.

8. The battery pack according to claim 1, wherein: The bracket includes a main body. When viewed from a direction opposite to the first direction, the main body extends along a third direction by a distance that is substantially the same as the distance that the battery cell extends along the third direction. The third direction and the first direction are both perpendicular to the second direction.

9. The battery pack according to claim 8, characterized in that: The battery cell close to the cover plate is a first battery cell, and the bracket includes a convex portion provided on a side of the main body close to the first battery cell, and the convex portion protrudes out of the main body.

10. The battery pack according to claim 9, characterized in that: The bracket further includes a fixing portion connected to the main body, and the bracket is fixed to the battery pack housing through the fixing portion.

11. The battery pack according to claim 10, wherein: Along the third direction, the fixing portion is located between the battery cell and the battery pack casing.

12. The battery pack according to claim 11, wherein: The bracket is arranged between the cover plate and the first battery cell, and is fixed to the battery pack casing.

13. The battery pack according to claim 10, characterized in that: There is a gap between the main body and the first battery core, and the second resin layer is arranged in the gap.

14. The battery pack according to claim 13, wherein: The cover plate is provided with a protrusion, and the protrusion is arranged opposite to the detection member.

15. The battery pack according to claim 2, wherein: The first detection part includes a thin film sheet and a conductive silver paste arranged on the thin film sheet.

16. An electrical device, characterized in that: The electric device comprises a body and a battery pack as claimed in any one of claims 1 to 15, wherein the battery pack is arranged in the body.

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