Battery pack, method for manufacturing battery pack, and electricity-using device

Abstract

A battery pack including a cover plate, a battery cell module, a second resin layer, and a battery pack case, the battery cell module being housed in the battery pack case and fixed by the second resin layer, the cover plate being fixed to the battery pack case, the battery cell module including a plurality of battery cells stacked along a second direction, the battery cells including a first end and a second end provided opposite to each other along the first direction, and a battery cell closer to the cover plate is a first battery cell. The battery pack further includes an insulating assembly provided at the second ends of the at least two battery cells, the insulating assembly and the second ends of the at least two battery cells forming a first space, the first space communicating with a gap between the at least two battery cells, the insulating assembly closing one side of the first space, the one side of the first space being spaced apart from the battery cells along a direction opposite to the first direction, and the insulating assembly and the first space forming an exhaust passage communicating with the outside of the battery pack. The present invention also relates to a method for manufacturing a battery pack and an electricity-using device. By using the above-described battery pack, the safety performance of the electricity-using device can be improved.

Description

[Technical Field]

[0001] This application claims priority from a Chinese patent application filed on January 21, 2021, with application number 202110082287.7. The present application relates to the technical field of battery manufacturing, and more particularly to battery packs, methods of manufacturing battery packs, and electrical-using devices. [Background technology]

[0002] When conventional soft-packaged lithium batteries are used normally for a long time or when an abnormality occurs, gas will be generated inside the battery cell, causing the battery cell to expand. When the expansion of the battery cell reaches a certain level, it may lead to the battery cell exploding. If the expansion of the battery cell cannot be controlled in a timely manner, a series of safety hazards will occur during battery use. Summary of the Invention [Problem to be solved by the invention]

[0003] In view of the above problems, it is necessary to provide a battery pack and an electrical device that can improve the problem of battery expansion and improve the safety of battery use. [Means for solving the problem]

[0004] A battery pack according to an embodiment of the present application includes a cover plate, a battery cell module, a second resin layer, and a battery pack case, wherein the battery cell module is housed in the battery pack case and secured by the second resin layer, and the cover plate is secured to the battery pack case, and the battery cell module includes a plurality of battery cells stacked along a second direction, the battery cells having first and second ends facing each other along the first direction, the battery cell closest to the cover plate being the first battery cell, and the first direction is perpendicular to the second direction. The battery pack further includes an insulating assembly provided at the second ends of at least two battery cells, wherein the insulating assembly and the second ends of the at least two battery cells form a first space, the first space communicating with a gap between the at least two battery cells, the insulating assembly closing one side of the first space, and the one side of the first space being away from the battery cells in a direction opposite to the first direction, and the insulating assembly and the first space forming an exhaust passage communicating with the outside of the battery pack.

[0005] By providing an insulating assembly, such a battery pack can: A first space is formed at one end of the cell, and the insulating assembly and the first space form an exhaust passage that is connected to the outside. This allows gas inside the battery pack to be released in a timely manner through the exhaust passage, balancing the pressure inside and outside the battery pack, eliminating the risk of air pressure imbalance and improving the problem of battery expansion, thereby improving the safety of battery use. .

[0006] In one possible embodiment, the battery pack includes a first resin layer provided on second ends of the at least two battery cells, the first resin layer being adhered to the insulating assembly and the second ends of the at least two battery cells.

[0007] By providing the first resin layer, such a battery pack can reduce the amount of the second resin layer used, fix the battery cell module, and reduce the cost of the battery pack.

[0008] In one possible embodiment, the insulating assembly includes a second insulating member and a third insulating member, the second insulating member being provided at a second end of the at least two battery cells, the second insulating member having a third through hole that communicates with a gap between the at least two battery cells, the third insulating member closing one side of the third through hole, and the one side of the third through hole being away from the battery cells along a direction opposite to the first direction.

[0009] Such a battery pack can further reduce the amount of the second resin layer used, thereby reducing the cost of the battery pack.

[0010] In one possible embodiment, when viewed along the first direction, the second insulating member covers the first resin layer, an adhesive structure is provided on the surface of the second insulating member that is closest to the first resin layer, and the second insulating member is adhered to the battery cell via the adhesive structure.

[0011] With such a battery pack, the second insulating member can be bonded to the battery cell by an adhesive structure.

[0012] In one possible embodiment, the second insulating member is bonded to the second end of the battery cell, and the first resin layer is provided on the edge of the third through hole.

[0013] This battery pack reduces the amount of the first resin layer used, thereby reducing the cost of the battery pack.

[0014] In one possible embodiment, the battery pack includes a first insulating member disposed between at least two battery cells, and an opening is provided in the first insulating member at a position close to a second end of the battery cells, the opening communicating with the first space.

[0015] In this battery pack, the first insulating member provides a deformation space for the electric cells, thereby reducing the risk of the cover plate or the battery pack case exploding due to two adjacent electric cells directly pressing against each other or an electric cell pressing against the cover plate or the battery pack case. The provision of the first space communicating with the opening achieves the purpose of exhaust.

[0016] In one possible embodiment, the second insulating member includes a first body having a third through hole formed therein.

[0017] In such a battery pack, the first body has a third through-hole that can communicate with the gap between the plurality of battery cells and the first insulating member, thereby achieving the purpose of exhaust.

[0018] In one possible embodiment, the cover plate includes a first through hole, and the second insulating member further includes a first portion located at least partially in the first through hole.

[0019] In such a battery pack, the first through-hole allows a partial structure of the battery cell module to protrude from the first through-hole and be connected to an external structure (e.g., a circuit board) provided on the cover plate. The first portion can be at least partially located in the first through-hole, and the second insulating member can be connected to the external structure.

[0020] In one possible embodiment, the first portion extends from the cover plate through the first through hole.

[0021] In such a battery pack, the first portion extends from the cover plate through the first through-hole, facilitating connection between the second insulating member and an external structure.

[0022] In one possible embodiment, the third insulating member is provided with an exhaust groove that communicates with the third through hole.

[0023] In such a battery pack, an exhaust groove is provided and the exhaust groove is connected to the second through-hole to form an exhaust passage, so that gas inside the battery pack can be exhausted through the exhaust groove.

[0024] In one possible embodiment, the third insulating member includes a second body and a second part, the second body closes the third through hole, the second part is connected to the first part, and at least a portion of the second part is located in the first through hole.

[0025] In such a battery pack, the second part serves to support and fix the first part, and the second part is at least partially located in the first through hole, allowing the third insulating member to be connected to an external structure.

[0026] In one possible embodiment, the second portion extends from the cover plate through the first through hole.

[0027] In this battery pack, the second portion extends from the cover plate through the first through-hole, which facilitates connection of the third insulating member to an external structure.

[0028] In one possible embodiment, the third insulating member is provided with a second adhesive region, and the second adhesive region is provided with an adhesive structure, and the third insulating member is adhesively connected to the second insulating member via the adhesive structure.

[0029] In this battery pack, by providing the adhesive region, the second insulating member and the third insulating member can be connected via the adhesive structure of the adhesive region.

[0030] In one possible embodiment, the second insulating member and the third insulating member are of an integrally molded structure, and are provided with an exhaust groove communicating with the third through hole.

[0031] The second insulating member and the third insulating member of this battery pack are integrally molded, allowing for mold opening and reducing the difficulty of processing. The second insulating member and the third insulating member can have an integrally molded structure, and an exhaust groove is provided, and the exhaust groove and the third through-hole are connected to form an exhaust passage, allowing gas inside the battery pack to be exhausted through the exhaust groove.

[0032] In one possible embodiment, the first insulating member includes foam cotton.

[0033] In such a battery pack, the foam cotton provides deformation space for the battery cells, thereby preventing the cover plate or the battery pack case from bursting due to two adjacent electric cells being pushed directly against each other or an electric cell being pushed against the cover plate or the battery pack case.

[0034] In one possible embodiment, the first insulating member has a second through-hole formed therein, which provides an expansion space for the battery cell.

[0035] In this battery pack, the amount of the first insulating member used is reduced by providing the second through-hole in the first insulating member, and the generation of gas is also reduced.

[0036] In one possible embodiment, the battery cell includes an electrode assembly, a battery cell shell, and a metal portion, the electrode assembly is housed within the battery cell shell, the metal portion is connected to the electrode assembly and extends from the battery cell shell, and when viewed along a direction opposite to the second direction, the projected area of ​​the first insulating member on the battery cell is greater than or equal to the projected area of ​​the electrode assembly.

[0037] In this battery pack, the dimensions of the first insulating member are set in this manner, reducing the phenomenon in which, when the second resin layer is filled into the stacked battery cells, the second resin layer enters between two adjacent battery cells from the side edges of the battery cells, making it impossible to compress the first insulating member.

[0038] In one possible embodiment, when viewed along a direction opposite to the second direction, the projected area of ​​the first insulating member on the battery cell is equal to or smaller than the projected area of ​​the battery cell shell.

[0039] By setting the dimensions of the first insulating member in this manner, such a battery pack makes it easier to assemble the battery cell modules into the battery pack case, reducing the number of cases where assembly is difficult.

[0040] In one possible embodiment, the second resin layer includes a sealing rubber, and the second resin layer adhesively fixes the battery cell module and the battery pack case together.

[0041] The second resin layer of this battery pack is a sealing rubber, which can perform functions such as adhesion, sealing, injection, and coating protection for the components.

[0042] In one possible embodiment, the first resin layer is formed by applying and fixing a liquid resin to the second end of the battery cell.

[0043] The first resin layer of this battery pack is liquid, making it easy to install according to the actual situation.

[0044] In one possible embodiment, there is a gap between the first insulating member and the second end of the battery cell.

[0045] In such a battery pack, gas can pass through the gaps that exist between the first insulating member and the battery cells, and the first insulating member can easily vent the battery cells.

[0046] In one possible embodiment, at least a portion of the insulating assembly is provided on the second resin layer.

[0047] In such a battery pack, the insulating assembly can be connected to the battery cell module via the second resin layer.

[0048] Further, a method for manufacturing a battery pack according to the present invention includes the steps of: providing a plurality of electric cells in a battery pack case, providing a first insulating member between at least two electric cells, and providing a gap between the at least two electric cells; providing an insulating assembly at second ends of the at least two battery cells, forming a first space between the insulating assembly and the second ends of the at least two battery cells, and communicating the first space with a gap between the at least two battery cells; the insulating assembly closes one side of the first space, the one side of the first space is separated from the battery cell in a direction opposite to a first direction, the insulating assembly and the first space form an exhaust passage, and the exhaust passage communicates with the outside of the battery pack; and after the insulating assembly is installed, molding a second resin layer inside the battery pack case.

[0049] This battery pack manufacturing method can manufacture the above-mentioned battery pack, which makes it easier to move the second ends of the battery cells and improves the accuracy of detecting the expansion degree of the battery cell module, while reducing the amount of the second resin layer used and reducing the cost required for the battery pack.

[0050] In one possible embodiment, the injection method of the second resin layer may be rubber injection or injection molding.

[0051] The method for manufacturing this battery pack is perfusion by rubber injection or injection molding, which is easy to operate.

[0052] An electricity using device according to the present invention includes a main body and the battery pack according to any one of the above-described aspects provided in the main body.

[0053] By adopting the above-described battery pack, such an electricity-using device can improve its own safety performance. [Brief explanation of the drawings]

[0054] [Figure 1] 1 is a schematic diagram of a three-dimensional structure of a battery pack according to an embodiment of the present application. [Figure 2] FIG. 2 is an exploded schematic view of the battery pack shown in FIG. [Figure 3] 3 is a three-dimensional structural view of the cover plate shown in FIG. 2 at another viewing angle. [Figure 4] 3 is an exploded schematic view of a battery cell module in the battery pack shown in FIG. 2. [Figure 5] 3 is an exploded schematic view of another embodiment of the battery cell module shown in FIG. 2. FIG. [Figure 6] FIG. 10 is an exploded schematic view of a battery cell module in a battery pack according to another embodiment of the present application. [Figure 7] FIG. 5 is a schematic diagram of the three-dimensional structure of a battery cell in the battery cell module shown in FIG. [Figure 8] FIG. 8 is an exploded schematic view of the battery cell shown in FIG. [Figure 9] 5 is a schematic diagram of the three-dimensional structure of the holder in the battery pack shown in FIG. 4 at another viewing angle. [Figure 10] 10 is a schematic diagram of the three-dimensional structure of a holder of a battery pack according to another embodiment of the present application at another viewing angle. [Figure 11] The battery pack shown in FIG. 1 is a cross-sectional view taken along line MM after the cover has been removed. [Figure 12] FIG. 5 is an exploded schematic view of a detection element in the battery cell module shown in FIG. [Figure 13] FIG. 10 is an exploded schematic view of a battery pack according to another embodiment of the present application. [Figure 14] FIG. 6 is a schematic diagram of a three-dimensional structure of the first insulating member shown in FIG. 5. [Figure 15] 15 is a schematic plan view showing the connection state between the first insulating member and the battery cell shown in FIG. 14. FIG. [Figure 16] 15 is a side view showing the stacked state of the first exhaust member and the battery cell shown in FIG. 14. FIG. [Figure 17] 17 is a schematic diagram showing a state in which a first resin layer is provided on the stacked battery cells and first exhaust member shown in FIG. 16. FIG. [Figure 18] FIG. 6 is a schematic diagram of a three-dimensional structure of the second insulating member shown in FIG. 5. [Figure 19] FIG. 6 is a schematic diagram of a three-dimensional structure of the third insulating member shown in FIG. 5. [Figure 20] 3 is a schematic cross-sectional view of a battery cell module taken along line NN in the battery pack shown in FIG. 2. [Figure 21]10 is a schematic plan view showing a connection state between a first exhaust member and a battery cell in another embodiment of the present application. FIG. [Figure 22] FIG. 10 is an exploded schematic view of a battery cell module in a battery pack according to a further embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0055] Hereinafter, technical aspects of the embodiments of the present application will be described in conjunction with the drawings of the embodiments of the present application. As will be apparent, the described embodiments are only some of the embodiments of the present application, and are not all of the embodiments.

[0056] It should be understood that when one component is referred to as being connected to another component, it may be directly connected to the other component, or there may be intervening intermediaries. Also, when one component is referred to as being "mounted" to another component, it may be directly mounted to the other component, or there may be intervening intermediaries. As used herein, the terms "top," "bottom," "upper," "lower," "left," "right," "front," "rear," and similar expressions are used for descriptive purposes only.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0058] A battery pack according to an embodiment of the present application includes a cover plate, a battery cell module, a second resin layer, and a battery pack case, wherein the battery cell module is housed in the battery pack case and secured by the second resin layer, and the cover plate is secured to the battery pack case, and the battery cell module includes a plurality of battery cells stacked along a second direction, the battery cells having first and second ends facing each other along the first direction, the battery cell closest to the cover plate being the first battery cell, and the first direction is perpendicular to the second direction. The battery pack further includes an insulating assembly provided at the second ends of at least two battery cells, wherein the insulating assembly and the second ends of the at least two battery cells form a first space, the first space communicating with a gap between the at least two battery cells, the insulating assembly closing one side of the first space, and the one side of the first space being away from the battery cells in a direction opposite to the first direction, and the insulating assembly and the first space forming an exhaust passage communicating with the outside of the battery pack.

[0059] Hereinafter, several embodiments will be described in detail with reference to the accompanying drawings. The following examples and features of the examples may be combined if they do not conflict with each other.

[0060] As shown in FIGS. 1 and 2 , a battery pack 100 according to an embodiment of the present application includes a cover plate 10, a battery cell module 20, a second resin layer 30, and a battery pack case 40. The battery cell module 20 and the second resin layer 30 are provided inside the battery pack case 40. The second resin layer 30 secures the battery cell module 20 to the battery pack case 40. The cover plate 10 is secured to the battery pack case 40 with fasteners such as screws, and together with the battery pack case 40, encloses the battery cell module 20 to protect it. In one embodiment, the second resin layer 30 is formed by injecting resin into the battery pack case 40 and securing it therein. In another embodiment, the second resin layer 30 includes potting rubber.

[0061] To better explain the configuration of the battery pack 100, the configuration of the battery pack 100 will be described using X, Y, and Z coordinate axes, where each pair of the X, Y, and Z coordinate axes is orthogonal to each other.

[0062] 2 and 3, the cover plate 10 is provided on the battery pack case 40 along the Z-axis direction. Specifically, the battery pack case 40 and the cover plate 10 are provided sequentially along the Z-axis direction. The cover plate 10 includes a substantially rectangular plate body 11. When the cover plate 10 is provided on the battery pack case 40, the plate body 11 is provided on the top surface of the battery cell module 20.

[0063] In one embodiment, the cover plate 10 further includes a protrusion 12 provided on the side of the plate body 11 closer to the battery cell module 20 so that the cover plate 10 can better contact the battery cell module 20 via the protrusion 12.

[0064] In one embodiment, the cover plate 10 further includes an escape opening 13. The battery pack case 40 can be extended through the escape opening 13 so that some structures of the battery cell module 20 are exposed to the outside of the cover plate 10 and the battery pack case 40. This allows the battery cell module 20 to communicate with the external environment, making it easier to exhaust gas generated in the battery cell module 20.

[0065] In one embodiment, the cover plate 10 further includes a first through hole 14. The first through hole 14 and the escape opening 13 are provided at opposite ends of the plate body 11 along the first direction. By providing the first through hole 14, a partial structure of the battery cell module 20 protrudes from the first through hole 14 and is further connected to an external structure (e.g., a circuit board) provided on the cover plate 10. In this embodiment, the first direction is along the X-axis.

[0066] In other embodiments, the shape of the plate 11 is not limited to this, and for battery packs 100 with different shapes, the shape of the plate 11 can be changed according to the different battery packs 100 .

[0067] 4 and 5 , the battery cell module 20 includes a plurality of battery cells 21 stacked along a second direction, a holder 22, and a detection element 23. In this embodiment, the second direction is along the Z axis, also referred to as the thickness direction of the battery cells 21. The holder 22 is provided above the battery cells 21. In this embodiment, the holder 22 is provided above the battery cells 21 closest to the cover plate 10. Furthermore, the battery cell 21 closest to the cover plate 10 is defined as the first battery cell M. The holder 22 is located between the cover plate 10 and the first battery cell M. The detection element 23 is provided on the holder 22 and located between the cover plate 10 and the holder 22 to detect the expansion degree of the battery cell module 20. If the expansion degree of the battery cell module 20 is greater than the safe expansion degree, the detection element 23 can detect this situation. This improves the safety of the battery pack 100.

[0068] 6, 7, and 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 has 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 arranged opposite to each other.

[0069] 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 via the adhesive layer to establish connection with the electrode assembly 211. The metal layer is located between the insulating layer and the adhesive layer and can strengthen the strength of the battery cell shell 212. The insulating layer is separated from the electrode assembly 211 and can prevent external moisture from penetrating into the electrode assembly 211. The metal portion 213 is used to connect the battery cell 21 to an external structure so that the battery cell 21 can communicate with the external structure. The metal portions 213 of two adjacent battery cells 21 are connected to each other to establish electrical conductivity between the multiple battery cells 21. In this embodiment, the metal portion 213 is an electrode tab. The electrode tab is divided into a positive electrode tab and a negative electrode tab. The positive and negative electrode tabs of two adjacent battery cells 21 are connected to each other.

[0070] The battery cell 21 is arranged along a first direction, and the metal portion 213 extends from within the battery cell shell 212 along the first direction. Along the first direction, the battery cell 21 includes a first end A and a second end B arranged opposite to each other. The first end A is the end from which the metal portion 213 extends. The second end B is the end away from the end from which the metal portion 213 is arranged. In this embodiment, there are two metal portions 213. The two metal portions 213 protrude from the battery cell shell 212 at the first end A of the battery cell 21. In another embodiment, one of the two metal portions 213 may extend from the battery cell shell 212 at the first end A of the battery cell 21, and the other metal portion 213 may extend from the battery cell shell 212 at the second end B of the battery cell 21. In this embodiment, at the second end B, the battery cell 21 includes a first surface 214 and a second surface 215 that are not coplanar. 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 serve as a reference when installing other components on the battery cell module 20, making the overall structure of the battery cell module 20 flatter and facilitating the assembly of the battery cell module 20 into the battery pack case 40.

[0071] As shown in FIGS. 4, 5, and 9, the holder 22 is installed above the first battery cell M. The holder 22 includes a main body 221, which has a substantially rectangular plate-like structure. The extension distance of the main body 221 along the third direction is substantially the same as the extension distance of the battery cell 21. In this embodiment, the third direction is the Y-axis direction. However, the term "substantially" does not mean absolute equivalence, and there may be a deviation of ±5 mm to ±10 mm between the two. In one embodiment, a first gap (not shown) exists between the main body 221 and the first battery cell M. When molten resin is injected into the battery pack case 40, the second resin layer 30 flows into the first gap, strengthening the fixing strength between the main body 221 and the first battery cell M.

[0072] In one embodiment, the holder 22 includes a plurality of protrusions 222. The protrusions 222 are spaced apart on a side of the main body 221 that is closer to the first battery cell M, and extend a first distance toward the first battery cell M so as to protrude from the main body 221. The protrusions 222 and the main body 221 form a groove 223 that communicates with the first gap. Providing the protrusions 222 can increase the strength of the main body 221. Furthermore, as shown in FIG. 11 , when the battery cell module 20 is installed in the battery pack case 40, a second resin layer 30 can be provided between the main body 221 and the battery cell 21. Providing the second resin layer 30 in the groove 223 further enhances the stability between the holder 22 and the battery cell 21.

[0073] In one embodiment, the holder 22 further includes a fixing portion 224 connected to a side edge of the main body 221 along the third direction. In one embodiment, there are two fixing portions 224. The two fixing portions 224 are connected to opposite side edges of the main body 221. In this embodiment, the fixing portions 224 are disposed perpendicular to the main body 221; however, in other embodiments, the fixing portions 224 may be disposed at other angles relative to the main body 221. The holder 22 is fixed in the battery pack case 40 via the fixing portions 224, which serves to pre-position the holder 22 and reduce movement of the holder 22 due to the flow of the second resin layer 30 during the rubber injection process into the battery cell module 20. In one embodiment, the fixing portion 224 is formed with a fixing hole 225. The fixing portion 224 engages with the inner wall of the battery pack case 40 via the fixing hole 225, thereby pre-positioning the holder 22.

[0074] The fixing portion 224 and the battery pack case 40 are snap-connected to each other so that the holder 22 can be moved more easily when the battery cells 21 expand. When the second resin layer 30 fixes the battery cell module 20, the second resin layer 30 in the fixing holes 225 is small, and the holder 22 is fixed to an extent that does not affect its movement.

[0075] It is understood that in other embodiments, the number and installation positions of the fixing portions 224 are not limited to this. For example, six or eight fixing portions 224 may be provided. The shape of the main body 221 is also not limited to this.

[0076] In one embodiment, the battery cell module 20 includes a holder 22 provided above the first battery cell M along the second direction. The first surface O of the first battery cell M may have irregularities. By installing the holder 22 and placing the detection element 23 on the holder 22, the detection element 23 is positioned on a flat surface, thereby improving the detection accuracy of the detection element 23.

[0077] In other embodiments, the holder 22 is not limited to being provided above the first battery cell M, but may be provided between two adjacent battery cells 21.

[0078] 10, in another embodiment, a holder 22 is also provided, which includes a main body 221, a protrusion 222, and a fixing portion 224. The protrusion 222 is provided 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. A second resin layer 30 may be provided between the main body 221 and the first battery cell M. The fixing portion 224 has the same configuration as the fixing portion 224 in the above embodiment. No further description will be given here.

[0079] 4, 5, and 12, the detection element 23 is used to detect the degree of expansion of the battery cell module 20 and transmit the detected information. The detection element 23 includes a first detection unit 231 provided on a surface of the holder 22 close to the cover plate 10, a second detection unit 232 provided on the first detection unit 231, and a guide wire 234 connected to the first detection unit 231. When the first detection unit 231 and the second detection unit 232 are connected, information is transmitted via the guide wire 234.

[0080] In one embodiment, the first detection unit 231 and the second detection unit 232 each include a thin film sheet, and the thin film sheet is provided with a conductive silver paste. The conductive silver paste may function as a conductive portion of the first detection unit 231 and the second detection unit 232.

[0081] The detection element 23 further includes a first adhesive region 233. The first adhesive region 233 is provided in a position close to the edge of the first detection unit 231, and an adhesive, double-sided tape, or the like is applied to this position so that the first detection unit 231 and the second detection unit 232 can be connected via the first adhesive region 233. The adhesive is applied to the first adhesive region 233 so that a gap of, for example, 0.2 mm is formed between the first detection unit 231 and the second detection unit 232 in the region other than the first adhesive region 233.

[0082] When the battery cell module 20 expands, the first battery cell M pushes up the second resin layer 30, which pushes up the holder 22, and the holder 22 pulls the first detection unit 231 toward the second detection unit 232 until they are connected. After they are connected, the conductive silver paste in the first detection unit 231 and the conductive silver paste in the second detection unit 232 come into contact with each other to form a conductive circuit, which is also connected to an external structure via the guide wire 234. This allows information to be transmitted that the first detection unit 231 and the second detection unit 232 are in communication with each other.

[0083] In one embodiment, the cover plate 10 is provided with a protrusion 12, and the installation position of the protrusion 12 corresponds to the detection element 23 to make the detection effect of the detection element 23 more accurate. When the battery cell 21 expands, the protrusion 12 can abut against the second detection part 232, making it easier to connect the first detection part 231 and the second detection part 232, and improving the accuracy of the detection element 23.

[0084] In this embodiment, when the first detector 231 and the second detector 232 are not connected, the electrical resistance of the guide wire 234 is considered to be infinite. When abnormal expansion occurs in the battery cell 21, the first detector 231 and the second detector 232 can be connected to form a complete circuit. In this case, the electrical resistance of the guide wire 234 drops rapidly, allowing for timely response and detection, thereby improving the safety of the battery pack 100.

[0085] It is understood that in other embodiments, the detection mode of the detection element 23 is not limited to detecting electrical resistance. For example, it may be a detection method that can respond immediately after the first detection unit 231 and the second detection unit 232 are electrically connected, or it may be another detection mode that has the same effect or function.

[0086] In one embodiment, the detection element 23 and the holder 22 may be provided between two adjacent battery cells 21 .

[0087] In one embodiment, the degree of expansion of the battery cell 21 can be set. For example, the critical value can be set when the degree of expansion of the battery cell 21 exceeds 15%. It should be understood that a larger critical expansion value can be selected to reduce the probability of malfunction of the battery pack 100 during use. In a specific embodiment, the normal expansion degree of the battery cell 21 is 0 to 20%. A gap is provided between the first detection unit 231 and the second detection unit 232, allowing further expansion of the battery cell 21. In one embodiment, this gap allows 5% re-expansion of the battery cell 21. When the battery cell 21 expands to 20%, the first detection unit 231 and the second detection unit 232 are electrically connected.

[0088] Referring to FIG. 6 , in one embodiment, the detection element further includes a support portion 235. When the battery cell module 20 expands, the first detection portion 231 and the second detection portion 232 move along the second direction, pulling the guide wire 234 during the movement. Because the second resin layer 30 fixes the guide wire 234, the first detection portion 231 and the second detection portion 232 may pull the guide wire 234 away during the movement. To reduce this situation, a support portion 235 is provided on the side of the guide wire 234 closest to the holder 22, positioned between the guide wire 234 and the holder 22, thereby increasing the height of the guide wire 234 in the second direction. When the guide wire 234 is slightly lifted, the first detection portion 231 and the second detection portion 232 move when the battery cell module 20 expands, allowing the guide wire 234 to move along with them, thereby reducing the possibility of the guide wire 234 being pulled away.

[0089] In one embodiment, a first distance d exists between the support portion 235 and the first and second detection portions 231 and 232 along the third direction. This arrangement allows the first and second detection portions 231 and 232 to be flatter. When abnormal expansion of a battery cell 21 is detected, the battery cell module 20 cuts off electrical continuity between the battery cells 21, thereby reducing the continued use of the battery cells 21. After the detection element 23 is made conductive, the battery cell module 20 may be melted to open the battery pack 100 and prevent further use.

[0090] As shown in FIG. 6 , in one embodiment, the detection element 23 is disposed close to the second end B of the battery cell 21 so that the detection element 23 can more easily detect the expansion state of the battery cell 21. In a specific embodiment, the distance from the second end B to the first end A along the first direction X is L. The detection element 23 may be disposed at a location that is ¼ to ⅓L away from the second end B along the first direction X. The position of the holder 22 on the first battery cell M can be adjusted depending on the installation position of the detection element 23. The first end A of the battery cell 21 is provided with a metal part 213 that needs to be connected to an external structure to achieve electrical continuity of the battery cell 21. The second end B is not connected to any external structure.

[0091] The second resin layer 30 secures the battery cell module 20 within the battery pack case 40, the metal part 213 is connected to an external structure, and the first end A is fixed by the second resin layer 30. Because the second resin layer 30 provided at the second end B is thinner than the second resin layer 30 provided at the first end A, the adhesive 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. Therefore, the second end B is more likely to expand than the first end A. To reduce rattle caused by the small amount of injected rubber at the second end B, an insulating assembly 26 can be installed at the second end B to reduce rattle at the second end B.

[0092] A second resin layer 30 is provided on the surface of the battery cell module 20, and in order to more easily detect whether the battery cell module 20 is expanding, partial rubber injection is performed at the position of the second end B to make the second end B more easily move. By placing the detection element 23 close to the second end B, it becomes easier to detect the degree of expansion of the battery cell module 20.

[0093] In one embodiment, when the second resin layer 30 secures the battery cell module 20, the second resin layer 30 is provided between the holder 22 and the first battery cell M. Furthermore, the second resin layer 30 may be provided on the surface of the holder 22 that faces away from the first battery cell M. The second resin layer 30 is also provided on the entire first surface O of the first battery cell M. This makes it possible for the entire holder 22 to receive a more uniform force when the battery cell 21 pushes up the holder 22 via the second resin layer 30 during expansion, resulting in more uniform transmission of the upward force and more accurate detection by the detection element 23.

[0094] The holder 22 is fixed by the second resin layer 30, and in order to reduce the situation where the first detection portion 231 and the second detection portion 232 of the detection element 23 cannot move due to the second resin layer 30 fixing the detection element 23, the detection element 23 needs to be exposed outside the second resin layer 30.

[0095] 13 , a detection element 23 according to another embodiment of the present application includes a first detection portion 231, a second detection portion 232, and a connection portion 236. When the first detection portion 231 is provided on the holder 22, the first detection portion 231 is provided on a surface of the holder 22 close to the cover plate 10, and the second detection portion 232 is provided on a surface of the cover plate 10 close to the battery cell 21. When the holder 22 is not provided on the battery cell module 20, the first detection portion 231 is provided on a surface of the first battery cell M close to the cover plate 10, and the second detection portion 232 is provided on a surface of the cover plate 10 close to the first battery cell M. The second detection portion 232 is provided with a connection portion 236 extending from the second detection portion 232 toward the first detection portion 231. The connection portion 236 is movable relative to the second detection portion 232 and can establish electrical conduction between the second detection portion 232 and the second detection portion 232. The second detection unit 232 is provided with a guide wire 234. The second detection unit 232 transmits information via the guide wire 234.

[0096] When the battery cell 21 is not normally expanded, there is a gap between the first detection unit 231 and the second detection unit 232. When the battery cell 21 expands abnormally, the battery cell 21 pushes up the first detection unit 231 or pushes up the first detection unit 231 via the holder 22 so that the first detection unit 231 connects with the connection unit 236 of the second detection unit 232. After the first detection unit 231 connects with the connection unit 236, the first detection unit 231 pushes up and moves the connection unit 236, thereby establishing electrical continuity between the connection unit 236 and the second detection unit 232. This places the inside of the second detection unit 232 in an electrically conductive state, transmitting information through the guide wire 234 and achieving the purpose of detection.

[0097] In this embodiment, the first detection portion 231 is an insulating sheet, the second detection portion 232 is a stroke switch, and the connection portion 236 is a contact in the stroke switch.

[0098] The form of the detection element 23 is not limited to the above-mentioned film sheet detection or stroke switch detection, but in other embodiments, the detection element 23 may be replaced with a form of detection of, for example, a metal piece.

[0099] 4 and 5, in one embodiment, the battery module 20 further includes a support member 24 provided at a connection position between the metal portions 213 of two adjacent battery cells 21. Specifically, after the metal portions 213 of two adjacent battery cells 21 are connected, an accommodation groove (not shown) is formed between the metal portions 213, and the support member 24 is provided in the accommodation groove. By providing the support member 24 in the accommodation groove, it serves to support and fix the metal portions 213, and the support member 24 separates the unconnected metal portions 213 between the two adjacent battery cells 21, thereby reducing the likelihood of the battery cells 21 shorting after they come into contact.

[0100] In one embodiment, the support member 24 is foam cotton, but it will be appreciated that in other embodiments, the support member 24 may be replaced with other materials having equivalent efficacy or function.

[0101] 4 and 5, in one embodiment, the battery cell module 20 further includes an intermediary unit 25. The intermediary unit 25 is provided at the first end A of the battery cell 21 to connect the metal part 213 and the guide wire 234, allowing the metal part 213 and the guide wire 234 to be connected to an external structure, and to monitor data such as the internal voltage of the battery cell 21 and activate a protection mechanism for the battery cell 21 after receiving information transmitted from the guide wire 234.

[0102] The relay unit 25 includes a relay plate 251, an adapter 252, and a stopper 253. The relay plate 251 is provided at the first end A of the battery cell 21. When viewed in the third direction, the guide wire 234 extends from the first detection unit 231, along the side of the battery cell 21 toward the relay plate 251, and is electrically connected to the relay plate 251. Here, the "side" of the battery cell 21 refers to a position near the edge between the first end A and the second end B of the battery cell 21. The adapter 252 is provided on the relay plate 251 and is electrically connected to the relay plate 251. The stopper 253 is used to stop the adapter 252 provided on the relay plate 251 and reduce movement of the adapter 252.

[0103] In one embodiment, the relay board 251 is a circuit board. In one embodiment, the adapter member 252 is a copper string. This copper string is further divided into a total positive copper string connected to the positive electrode tab of the battery cell 21 farthest from the cover plate 10 and a total negative copper string connected to the negative electrode tab of the battery cell 21 closer to the cover plate 10. The stopper 253 provides a stop for the total positive copper string. In one embodiment, the stopper 253 is a limit form.

[0104] In other embodiments, the connections of the positive and negative tabs of the total positive and negative copper wires to the battery cells 21 may be reversed. The stopper 253 may be replaced with another structure having the same effect or function.

[0105] As shown in FIGS. 4 and 5 , in one embodiment, an insulating assembly 26 may be provided at the second end B of the battery cell 21 to reduce the amount of the second resin layer 30 injected into the battery pack case 40. This facilitates movement of the second end B of the battery cell 21, improving the accuracy of detecting the expansion degree of the battery module 20 while reducing the cost of the battery pack 100. The insulating assembly 26 and the second end B of the battery cell 21 form a first space 265. The first space 265 communicates with the gap between at least two battery cells 21. The insulating assembly 26 closes one side of the first space 265. The one side of the first space 265 is spaced from the battery cells 21 in a direction opposite to the first direction. The insulating assembly 26 and the first space 265 form an exhaust passage communicating with the outside air of the battery pack 100.

[0106] The battery pack 100 includes a first resin layer 262. The first resin layer 262 is provided at the second end B of the battery cell 21 and has a hollow rectangular shape. When the first resin layer 262 is provided on the battery cell 21, it is possible to reduce the intrusion of the second resin layer 30 into the hollow portion. The insulating assembly 26 is provided on the surface of the first resin layer 262 and seals the hollow portion of the first resin layer 262. In this way, the amount of the first resin layer 262 and the amount of the second resin layer 30 used are reduced, making it possible to fix the battery cell module 20 and reduce the cost of the battery pack 100.

[0107] In one embodiment, when the battery pack 100 is in a harsh environment, such as a high-temperature environment, a safety issue may arise due to the difference in air pressure between the inside and outside of the battery pack 100. In this case, the battery cell module 20 can be vented through the insulating assembly 26. For example, gas generated from the battery cells 21 or other structures inside the battery pack 100 can be vented using the insulating assembly 26.

[0108] The first resin layer 262 and the insulating assembly 26 jointly form an exhaust passage, which communicates with the outside of the battery pack 100 to allow the internal structure of the battery pack 100 to be vented.

[0109] 4 and 14 , the battery pack 100 includes a first insulating member 261 disposed between two adjacent battery cells 21. The first insulating member 261 has two opposing surfaces, e.g., double-sided rubber, that allow the first insulating member 261 to adhere to the surface of the battery cells 21, allowing adjacent battery cells 21 to be fixed in pairs, thereby forming a stable battery cell module 20. A first space 265 is formed between at least two adjacent battery cells 21 and the insulating assembly 26. In one embodiment, the first insulating member 261 is foamed cotton. By disposing the foamed cotton between the two adjacent electric cells 21, the foamed cotton provides a deformation space for the electric cells 21 when they expand, reducing the risk of the adjacent electric cells 21 directly pushing against each other or the electric cells 21 pressing against the cover plate 10 or the battery pack case 40, which could result in rupture of the cover plate 10 or the battery pack case 40.

[0110] In other embodiments, the first insulating member 261 may be replaced with another member having an equivalent effect or function. The double-sided tape may be replaced with another form of adhesive, such as a liquid adhesive.

[0111] 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, making it more suitable for use with 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 accommodate expansion at the position of the second through hole 2611. For example, the battery cell 21 can be provided with an expansion range via the space provided by the second through hole 2611. At the same time, the amount of first insulating member 261 used can be reduced, thereby reducing the cost of the battery pack 100.

[0112] In one embodiment, the weak point of the battery cell 21 is located on the first surface O or the second surface P. Here, the "weak point" refers to a location of the battery cell 21 that is more susceptible to breakage.

[0113] 8 and 15 , in one embodiment, when viewed from the direction opposite the second direction, the projected area of ​​the first insulating member 261 onto the battery cell 21 is at least the area of ​​the electrode assembly 211 and at most the area of ​​the battery cell shell 212. In one embodiment, the projected area of ​​the first insulating member 261 onto the battery cell 21 is set between the maximum projected area and the minimum projected area. Setting the dimensions of the first insulating member 261 in this manner reduces a situation in which, when filling the second resin layer 30 into the stacked battery cells 21, the second resin layer 30 gets into between two adjacent battery cells 21 from the side edges of the battery cells 21, making it difficult to compress the first insulating member 261. It also makes it easier to assemble the battery cell module 20 into the battery pack case 40, reducing situations in which assembly is difficult.

[0114] In one embodiment, to facilitate exhaust of the battery cell 21 by the first insulating member 261, double-sided tape is not provided on a portion of the first insulating member 261 located near the second end B of the battery cell 21, and no adhesion is performed between this portion of the first insulating member 261 and the battery cell 21, allowing gas to pass through the gap that exists between the first insulating member 261 and the battery cell 21. Specifically, the portion of the first insulating member 261 where double-sided tape is not provided is as shown by the dashed line in Fig. 15 .

[0115] 16 , a first insulating member 261 is provided between the stacked battery cells 21. When viewed in 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. By making the end of the first insulating member 261 flush with the second surface 215, it is possible to effectively reduce the second resin layer 30 getting between the battery cells 21 and affecting the normal expansion of the battery cells 21, and also to facilitate assembly of the battery cells 21 and the battery pack case 40.

[0116] In one embodiment, the Shore hardness C 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 makes it easy to compress the first insulating member 261 and reduces the incompressibility of the first insulating member 261 when the battery cells 21 push out the first insulating member 261 due to the high hardness of the first insulating member 261, while making it easier to manage the dimensions of the stacked battery cells 21 and the first insulating member 261 and reducing the susceptibility to deformation due to the low hardness of the first insulating member 261.

[0117] In one embodiment, the first insulating member 261 is made of an elastic, porous material, which allows the first insulating member 261 to deform and provide deformation space for the expansion of the battery cells 21, while preventing the adhesive from penetrating and effectively ensuring that the second resin layer 30 does not get between two adjacent battery cells 21.

[0118] As shown in FIG. 17 , the stacked battery cells 21 are provided with a first resin layer 262 at the second end B. In this embodiment, the first resin layer 262 has a generally hollow rectangular shape when viewed in the first direction, and is formed by applying and fixing a liquid resin to the second end B of the battery cell 21. Referring also to 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 providing the first resin layer 262, the groove (not shown) between the first surface 214 and the second surface 215 is filled, thereby reducing the situation in which the second resin layer 30 flows onto the first surface 214 and the second surface 215 during subsequent rubber injection, which would affect gas emission from the battery cell module 20.

[0119] As can be understood, the arrangement of the first resin layer 262 in a hollow rectangular shape is designed based on the stacked battery cells 21. In other embodiments, when the battery cells 21 are replaced with other stacked shapes, the shape of the first resin layer 262 also changes.

[0120] 5 and 18, to further reduce the injection 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, and when viewed along the first direction, the second insulating member 263 covers the first resin layer 262. The second insulating member 263 has an adhesive structure (not shown), for example, double-sided tape, provided on a surface close to the first resin layer 262, so that the second insulating member 263 can be adhered to the battery cell 21 with the double-sided tape.

[0121] The second insulating member 263 includes a first body 2631. The first body 2631 is also substantially rectangular. A third through-hole 2632 is formed in the first body 2631 and has a rectangular shape with its longitudinal direction aligned with the second direction. The third through-hole 2632 communicates with the gaps that exist between the multiple battery cells 21 and the first insulating member 261, enabling exhaustion.

[0122] In one embodiment, the second insulating member 263 further includes a first portion 2633 extending along the second direction from the first body 2631. When the battery cell module 20 is assembled with the cover plate 10, the first portion 2633 is at least partially positioned in the first through-hole 14 of the cover plate 10.

[0123] In one embodiment, the second insulating member 263 is foam cotton. It will be understood that in other embodiments, the second insulating member 263 may be replaced with another structure having the same effect or function. The shape of the second insulating member 263 is not limited thereto, and in some cases where the battery cells 21 are stacked, the shape of the second insulating member 263 may be changed accordingly.

[0124] As shown in FIGS. 5 and 19, the third insulating member 264 is provided on the surface of the second insulating member 263 away from the first resin layer 262, and has substantially the same structure as the second insulating member 263.

[0125] 20, the third insulating member 264 includes a second main body 2641 extending from the second main body 2641 in the second direction, and a second portion 2642. corresponds to the first body 2631. Part 2 2642 is No. The second body 2641 and the second part 2642 are provided with an exhaust groove 2643. When the third insulating member 264 is connected to the second insulating member 263, the exhaust groove 2643 communicates with the second through-hole 2611 to form an exhaust passage, and gas is exhausted from the exhaust groove 2643 to the outside of the battery pack.

[0126] In one embodiment, when the cover plate 10 is assembled to the battery cell module 20, the first portion 2633 and the second portion 2642 are spaced apart from the cover plate 10 by a distance of 2 mm or more along the second direction to prevent the second resin layer 30 from entering the exhaust passage and preventing exhaust and pressure leakage. The exhaust groove 2643 has a depth in the direction opposite to the first direction that is less than or equal to 0.2 mm. The depth of the exhaust groove 2643 along the third direction is length is between 1 mm and 3 mm. By setting the size of the exhaust groove 2643 in this way, the exhaust groove 2643 can function as a dust prevention groove, and can reduce clogging of the exhaust passage by impurities such as dust.

[0127] The second main body 2641 is provided with a second adhesive region 2644. The second adhesive region 2644 is provided at an edge position of the second main body 2641. By providing an adhesive structure (not shown) such as double-sided tape in the second adhesive region 2644, the third insulating member 264 and the second insulating member 263 are connected to each other.

[0128] In one embodiment, the third insulating member 264 may be made of a polycarbonate (PC) material. The manufacturing material of the third insulating member 264 is not limited thereto. It is understood that other structures having equivalent effects or functions may be adopted in other embodiments.

[0129] In another embodiment, the second insulating member 263 and the third insulating member 264 may be formed as an integrally molded structure, with a common exhaust groove 2643 provided between them, and the exhaust groove 2643 may be connected to the third through-hole 2632.

[0130] When the insulating assembly 26 is provided on stacked battery cells 21, first, the battery cells 21 and the first insulating member 261 are stacked with a gap between them, then the first resin layer 262 is provided on the second end B of the stacked battery cells 21, and the second insulating member 263 is provided on the first resin layer 262 until the first resin layer 262 hardens and is fixed to the second end B of the battery cells 21. Finally, the third insulating member 264 is provided on the second insulating member 263 to complete the assembly of the insulating assembly 26 and the battery cells 21.

[0131] As shown in Figures 21 and 22, in another embodiment, an opening 2612 is formed in the first insulating member 261 at a position close to the second end B of the battery cell 21, and then the first insulating member 261 is bonded to the surface of the battery cell 21.

[0132] Next, the second insulating member 263 is bonded to the second end B of the battery cell 21, with the opening 2612 communicating with the third through-hole 2632 (i.e., the opening 2612 communicating with the first space 265). Next, the first resin layer 262 is provided along the edge of the third through-hole 2632. In this embodiment, the first resin layer 262 is formed into a substantially frame-like structure. Here, "similar" means similar in appearance. In practice, providing the first resin layer 262 with a certain thickness around the edge of the third through-hole 2632 reduces the second resin layer 30 from flowing into the third through-hole 2632 and affecting exhaust. Finally, the third insulating member 264 is installed on the second insulating member 263, with the exhaust groove 2643 communicating with the third through-hole 2632 to form a complete exhaust passage, facilitating exhaust of the battery cell module 20.

[0133] Furthermore, when the first insulating member 261 is a foam, the foam and the double-sided tape attached to the foam decompose in a high-temperature environment and generate gas. By providing the second through-holes 2611 in the first insulating member 261, the amount of first insulating member 261 used is reduced, and the generation of gas is also reduced. The gas generated from the foam and the double-sided tape on the foam is also discharged through the exhaust passage.

[0134] 4 and 5, in one embodiment, the battery pack 100 further includes a buffer material 27 provided on a side edge of the battery cell module 20 along the third direction. In one embodiment, the buffer material 27 is provided on the guide wire 234 and is located on the side edge of the battery cell module 20. By providing the buffer material 27 on the guide wire 234, it can serve to fix the guide wire 234 and reduce a situation in which the guide wire 234 moves in conjunction with the expansion of the battery cells 21, thereby affecting the accuracy of information transmission by the guide wire 234. At the same time, when vibrations occur in the battery pack 100, the buffer material 27 can also provide a buffering effect to the battery cell module 20, such as reducing damage to the battery cells 21 caused by the battery cell module 20 directly impacting the battery pack case 40.

[0135] In one embodiment, the cushioning material 27 is foam cotton. In other embodiments, the cushioning material 27 may be replaced with other structures having the same effect or function.

[0136] 4 , in one embodiment, the battery pack 100 further includes rubber pads 28. The rubber pads 28 are provided between the battery cell module 20 and the battery pack case 40 along the second direction and are used to protect the battery cells 21 and reduce deformation of the battery cells 21 due to collision with the battery pack case 40 when the battery cell module 20 is assembled into the battery pack case 40.

[0137] In one embodiment, the rubber pad 28 is a silica rubber pad 28. In other embodiments, the rubber pad 28 may be replaced with another structure having an equivalent effect or function. For example, foam cotton may be placed to protect the battery cells 21.

[0138] 2 , the battery pack 100 further includes a circuit board 29 provided on the surface of the cover plate 10 away from the battery cell modules 20. The adapter 252 of the relay unit 25 is connected to the circuit board 29, and the relay 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 controls data such as the voltage of the battery cells 21 and responds to the circuits of the battery cells 21 in a timely manner after receiving information transmitted from the guide wire 234, thereby ensuring the safety of the battery cells 21.

[0139] As shown in FIG. 2 , the second resin layer 30 is formed by potting the side edges of the battery cells 21 and then fixing them in place. After the electrode assembly 211 is sealed via the battery cell shell 212, the battery cells 21 are fixed at the side seal positions of the battery cell shell 212 by the second resin layer 30. That is, the second resin layer 30 is filled in the gaps between the side edges 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 edges of the battery cells 21 may be located at the periphery of the battery cell 21. This makes the second resin layer 30 more robust when fixing the battery cells 21. Furthermore, when assembling the holder 22 to the battery cell module 20, if the second resin layer 30 is not completely fixed, it is attached.

[0140] The injection method of the second resin layer 30 may be rubber injection or injection molding, for example, low-pressure injection molding. In this embodiment, the second resin layer 30 is a sealing rubber. This sealing rubber can perform functions such as bonding, sealing, injection, and coating protection for components. In one embodiment, the second resin layer 30 is an epoxy resin encapsulating rubber. In other embodiments, the second resin layer 30 may be replaced with other types of sealing rubber.

[0141] As shown in FIG. 2 , the battery pack case 40 houses the battery cell module 20. The second resin layer 30 is provided between the battery cell module 20 and the battery pack case 40. For example, the second resin layer 30 is potting rubber, which is injected between the battery cell module 20 and the battery pack case 40 and fixed to form the solid second resin layer 30. The second resin layer 30 bonds and fixes the battery cell module 20 and the battery pack case 40 together, enhancing the structural strength of the battery pack 100. The cover plate 10 and the battery pack case 40 are fixedly connected. For example, to protect the battery cell module 20 provided inside the battery pack case 40, the cover plate 10 is attached to the battery pack case 40 using fasteners such as screws.

[0142] The battery pack case 40 has a hollow rectangular parallelepiped structure with an approximately top lid and includes four side walls 41 and a bottom wall 42. The four side walls 41 and the bottom wall 42 form a storage space 43 surrounding the storage space 43. The battery cell module 20 is provided within the storage space 43. The cover plate 10 and the battery pack case 40 collectively enclose the battery cell module 20. The shape of the battery pack case 40 is determined according to the number of battery cells 21 stacked in the second direction. In one embodiment, the insulating assembly 26 is provided between the second end B of the battery cell 21 and the side wall 41 away from the metal portion 213.

[0143] It should be noted that in other embodiments, the shape of the battery pack case 40 is not limited to this. For example, if the battery cell module 20 is circular, the shape of the battery pack case 40 may be changed according to the shape of the battery cell module 20.

[0144] In other embodiments, the method of fixing the cover plate 10 and the battery pack case 40 is not limited to this. For example, a snap-fixing connection method may be used, or adhesive may be applied to corresponding edge positions of the cover plate 10 and the battery pack case 40 to fix them together.

[0145] The embodiment of the present application also provides an electricity-using device (not shown) including a main body and the battery pack 100 according to any of the above-described embodiments, with the battery pack 100 installed in the main body. For example, the electricity-using device may be an electric car, an electric bus, an electric automobile, an energy storage device, an electric bicycle, an aircraft, etc. Accordingly, when the electricity-using device is an electric automobile, the main body is a vehicle body structure, and the battery pack 100 is installed in the vehicle body structure and used to supply power.

[0146] In other embodiments, the electricity-using device may be a handheld electric device such as a vacuum cleaner or a weeder.

[0147] As described above, the battery pack 100 and the electrical device provided in the embodiment of the present application are provided with a detection element 23 in the battery cell 21 to detect whether the expansion degree of the battery cell module 20 exceeds the safe expansion range. After the expansion degree of the battery cell module 20 exceeds the safe expansion range, the detection element 23 immediately responds to protect the battery pack 100 and reduce the occurrence of safety issues. At the same time, the battery cell module 20 is provided with an insulation module 26. The exhaust passage formed by the insulation module 26 communicates with the outside atmosphere, allowing gas generated inside the battery pack 100 to be exhausted to the outside, balancing the pressure inside and outside the battery pack 100 and avoiding risks caused by air pressure imbalance.

[0148] Furthermore, those skilled in the art should recognize that the above embodiments are intended to illustrate the present application, not to limit the present application, and that any appropriate modifications and improvements to the above embodiments within the substantial spirit of the present application fall within the scope of protection of the present application. [Explanation of symbols]

[0149] 100 battery packs 10 Cover Plate 11 Plate 12 Protrusion 13 Evacuation Exit 14 First through hole 20 Battery Module 21 Battery Cells M 1st battery cell O Front page P 2nd side 211 Electrode Assembly 212 Battery cell shell 2121 Storage Unit 213 Metal Part A 1st end B Second end 214 1st surface 215 2nd surface 22 Holder 221 Main Unit 222 convex part 223 Groove 224 Fixed part 225 Fixed hole 23 Detector element 231 First detection unit 232 Second detection unit 233 1st adhesive area 234 Guidewire 235 Support part 236 Connection 24 Support member 25 Relay unit 251 Relay Board 252 adapter 253 Stopper 26 Insulation Assembly 261 First insulating member 2611 Second through hole 2612 Aperture 262 1st resin layer 263 Second insulating member 2631 First Body 2632 Third Through Hole 2633 Part 1 264 Third insulating member 2641 Second Main Unit 2642 Part 2 2643 Exhaust ditch 2644 2nd adhesive area 27 Cushioning material 28 rubber pads 29 Circuit Board 30 Second resin layer 40 Battery pack case 41 Side wall 42 Bottom wall 43 Containment Space 265 1st space

Claims

1. a cover plate, a battery cell module, a second resin layer, and a battery pack case; the battery cell module is housed in the battery pack case and fixed by the second resin layer, and the cover plate is fixed to the battery pack case; the battery cell module includes a plurality of battery cells, each of the battery cells including a first end and a second end that are provided opposite each other along a first direction, and each of the battery cells includes a metal portion provided at the first end; a battery pack in which the plurality of battery cells are stacked along a second direction, and the first direction is perpendicular to the second direction; the battery pack further includes an insulating assembly provided at second ends of the at least two battery cells; the insulating assembly and the second ends of the at least two battery cells form a first space, the first space communicating with a gap between the at least two battery cells; the insulating assembly closes one side of the first space, the one side of the first space is spaced apart from at least two of the battery cells in a direction opposite to the first direction, and the insulating assembly and the first space form an exhaust passage that communicates with the outside of the battery pack.

2. 2. The battery pack according to claim 1, further comprising a first resin layer provided on second ends of at least two of the battery cells, the first resin layer being bonded to the insulating assembly and the second ends of the at least two battery cells.

3. the insulating assembly includes a second insulating member and a third insulating member; the second insulating member is provided at second ends of at least two of the battery cells; a third through-hole is provided in the second insulating member, the third through-hole communicating with a gap between at least two of the battery cells; the third insulating member closes one side of the third through hole, The battery pack according to claim 2 , wherein one side of the third through-hole is spaced apart from at least two of the battery cells in a direction opposite to the first direction.

4. 4. The battery pack according to claim 3, wherein, when viewed along the first direction, the second insulating member covers the first resin layer, an adhesive structure is provided on a surface of the second insulating member that is closer to the first resin layer, and the second insulating member is adhered to at least two of the battery cells via the adhesive structure.

5. 4. The battery pack according to claim 3, wherein the second insulating member is adhered to at least the second end of the battery cell, and the first resin layer is provided on an edge of the third through hole.

6. the battery pack includes a first insulating member provided between at least two of the battery cells; The battery pack according to claim 1 , wherein the first insulating member has an opening, the opening communicating with the first space.

7. The battery pack according to claim 3 , wherein the second insulating member includes a first body having the third through-hole opened therein.

8. The battery pack according to claim 3 , wherein the cover plate includes a first through hole, and the second insulating member further includes a first portion at least partially positioned in the first through hole.

9. The battery pack according to claim 8 , wherein the first portion extends from the cover plate through the first through-hole.

10. The battery pack according to claim 3 , wherein the third insulating member is provided with an exhaust groove communicating with the third through hole.

11. the third insulating member includes a second body and a second portion; the second body closes the third through hole, the second part is connected to the first part; The battery pack according to claim 8 , wherein at least a part of the second portion is located in the first through-hole.

12. The battery pack according to claim 11 , wherein the second portion extends from the cover plate through the first through-hole.

13. The third insulating member is provided with a second adhesive region, The second adhesive region is provided with an adhesive structure; The battery pack according to claim 8 , wherein the third insulating member is adhesively connected to the second insulating member via the adhesive structure.

14. the second insulating member and the third insulating member have an integrally molded structure and are provided with an exhaust groove; The battery pack according to claim 8 , wherein the exhaust groove communicates with the third through hole.

15. The battery pack according to claim 6 , wherein the first insulating member has a second through-hole formed therein, the second through-hole providing an expansion space for the battery cell.

16. The battery cell includes an electrode assembly, a battery cell shell, and a metal part; the electrode assembly is housed in the battery cell shell, and the metal portion is connected to the electrode assembly and extends from the battery cell shell; 7. The battery pack of claim 6, wherein, when viewed in a direction opposite to the second direction, a projected area of ​​the first insulating member on the battery cell is greater than or equal to a projected area of ​​the electrode assembly.

17. the second resin layer includes a sealing rubber, The battery pack according to claim 1 , wherein the second resin layer adhesively fixes the battery cell module and the battery pack case together.

18. The battery pack according to claim 6 , wherein there is a gap between the first insulating member and the second end of each of the battery cells.

19. A method for manufacturing the battery pack of claim 1, comprising: providing a plurality of battery cells in the battery pack case, providing a first insulating member between at least two of the battery cells, and providing a gap between the at least two of the battery cells; providing an insulating assembly at second ends of the at least two battery cells, the insulating assembly and the second ends of the at least two battery cells forming a first space, the first space communicating with a gap between the at least two battery cells; and after the insulating assembly is installed, molding a second resin layer inside the battery pack case.

20. An electricity-using device comprising: a main body; and the battery pack according to claim 1 provided in the main body.

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