A battery cell assembly, a battery pack and an electric device

Abstract

This invention relates to the field of power battery technology, and more particularly to a cell assembly, a battery pack, and an electrical device. The cell assembly includes a heat sink, a heat insulation structure, and a cell. Two heat sinks are spaced apart along a first direction. Each heat sink includes a main body. The main body has a first folded edge and a second folded edge on opposite sides along a second direction, and a third folded edge on one side along a third direction. The first, second, and third folded edges are all bent toward the other heat sink to cooperate with the main body to form an accommodating space. A cell is correspondingly disposed within an accommodating space, and the cell is in thermal contact with the main body, the first folded edge, the second folded edge, and the third folded edge. The heat insulation structure is at least partially disposed between the two cells to separate them. By partially enclosing the cell with the heat sink, the thermal contact area between the cell and the heat sink is increased, improving the heat dissipation efficiency of the cell. Furthermore, the folded edges can also be in thermal contact with the casing to transfer heat to the casing for heat dissipation, improving the heat dissipation efficiency of the battery pack.

Description

Technical Field

[0001] This invention relates to the field of power battery technology, and in particular to a cell assembly, battery pack and electrical equipment. Background Technology

[0002] The main cause of fires and explosions in electric bicycles is overheating or damage to the battery pack. A battery pack is a battery that provides power to power tools, electric vehicles, or electric bicycles.

[0003] Electric bicycles are small in size, making it difficult to equip their battery packs with cooling devices. Therefore, they rely on natural heat dissipation, which presents a significant challenge. When an electric bicycle's battery pack is continuously discharging or charging, the heat cannot dissipate, increasing the risk of fire or even explosion. This is especially true for off-road motorcycles, which require high-rate discharge and generate even more heat, making their battery packs more prone to overheating. Summary of the Invention

[0004] The present invention aims to provide a battery cell assembly, a battery pack, and an electrical device that can improve the heat dissipation efficiency of the battery pack.

[0005] To address the aforementioned technical problems, in a first aspect, embodiments of the present invention provide a battery cell assembly, the battery cell assembly including a heat sink, a heat insulation structure, and a battery cell. Two heat sinks are spaced apart along a first direction. Each heat sink includes a main body portion. The main body portion has a first folded edge and a second folded edge on opposite sides along a second direction. The main body portion has a third folded edge on one side along a third direction. The first folded edge, the second folded edge, and the third folded edge are all bent toward the other heat sink to cooperate with the main body portion to form an accommodating space. A battery cell is correspondingly disposed within one of the accommodating spaces. The battery cell is in thermal contact with the main body portion, the first folded edge, the second folded edge, and the third folded edge. The heat insulation structure is at least partially disposed between the two battery cells, and the two battery cells are spaced apart by the heat insulation structure.

[0006] In some embodiments, the main body, the first folded edge, and the second folded edge form a relief opening at one end away from the third folded edge; the electrode of the battery cell protrudes from the heat sink through the relief opening; the battery cell assembly further includes a top sealing strip, which fills the gap between the relief opening and the electrode.

[0007] In some embodiments, top sealing strips are provided on both sides of the electrode tab, and the top sealing strips on both sides cooperate to clamp the electrode tab.

[0008] Secondly, embodiments of the present invention also provide a battery pack, the battery pack including a housing and a cell assembly as described in any of the above claims, a plurality of the cell assemblies being arranged along the first direction to form a stack and disposed within the housing, wherein the first folded edge, the second folded edge, the third folded edge, and the main body portions at both sides of the stack are in thermal contact with the housing.

[0009] In some embodiments, the battery pack further includes a circuit board disposed within the housing, the circuit board being electrically connected to the tabs of the cell assembly; the circuit board having multiple sets of pressure relief holes, each set of pressure relief holes corresponding to a cell, each set of pressure relief holes including one or more pressure relief holes, and the housing being provided with a vent valve for relieving pressure inside the housing.

[0010] In some embodiments, the circuit board abuts against one end of the battery cell assembly where the tab is provided, the circuit board has a plurality of vias, and one tab passes through one via; the circuit board is provided with a plurality of conductive elements, and the battery cell is electrically connected to the conductive elements through the tab, so that the plurality of battery cells are connected in series.

[0011] In some embodiments, the battery pack further includes a controller and an isolation plate, both of which are disposed within the housing. The controller is electrically connected to the circuit board, and the isolation plate is disposed between the controller and the circuit board.

[0012] In some embodiments, the outer surface of the housing is provided with multiple reinforcing ribs at intervals;

[0013] And / or, a handle is provided on the outer side of the housing;

[0014] And / or, the outer side of the housing is provided with foot pads;

[0015] And / or, the housing is provided with an electrical connector, which is electrically connected to the controller;

[0016] And / or, the material of the housing includes metal.

[0017] In some embodiments, the gap between the battery cell assembly and the inner wall of the housing is filled with a thermally conductive material, and the gap between the battery cell assemblies is also filled with a thermally conductive material.

[0018] In some embodiments, the battery pack further includes straps that bind at least one of the cell components together.

[0019] Thirdly, embodiments of the present invention also provide an electrical device, the electrical device including a battery pack as described in any of the preceding claims.

[0020] Unlike related technologies, the battery cell assembly, battery pack, and electrical equipment of this invention are provided with a heat dissipation plate. The heat dissipation plate partially wraps around the battery cell through the main body, the first folded edge, the second folded edge, and the third folded edge to increase the thermal contact area between the heat dissipation plate and the battery cell, thereby improving the heat dissipation efficiency of the battery cell. Furthermore, when the heat dissipation plate is installed on the housing, the first folded edge, the second folded edge, the third folded edge, and the main body on both sides of the battery pack can also make thermal contact with the housing, thereby transferring heat to the housing for heat dissipation, thereby improving the heat dissipation efficiency of the battery pack. Attached Figure Description

[0021] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0022] Figure 1 This is a schematic diagram of the battery pack structure according to an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 Exploded view of the battery pack;

[0024] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0025] Figure 4 yes Figure 2 Schematic diagram of the upper and middle shell;

[0026] Figure 5 yes Figure 2 Schematic diagram of the middle bottom shell;

[0027] Figure 6 yes Figure 2 Exploded view of a core module;

[0028] Figure 7 yes Figure 2 A magnified view of a section at point B in the middle;

[0029] Figure 8 yes Figure 2 A schematic diagram of the circuit board structure in the image;

[0030] Figure 9 yes Figure 2 A schematic diagram of the controller structure.

[0031] The reference numerals in the detailed embodiments are as follows:

[0032] 100. Battery pack;

[0033] 1. Shell; 11. Cylinder; 111. Reinforcing rib; 112. Connection point; 12. Upper shell; 121. Handle; 122. Vent valve; 123. Electrical connector; 13. Bottom shell; 131. Foot pad; 14. Sealing ring;

[0034] 2. Battery cell assembly; 21. Heat sink; 211. Main body; 212. First fold; 213. Second fold; 214. Third fold; 215. Relief opening; 22. Heat insulation structure; 23. Battery cell; 231. Electrode tab; 24. Top seal;

[0035] 3. Straps;

[0036] 4. Circuit board; 41. First power terminal block; 42. First communication terminal block; 43. Pressure relief hole; 44. Through hole; 45. Conductive component;

[0037] 5. Controller; 51. Second power terminal block; 52. Second communication terminal block; 53. Third power terminal block; 54. Third communication terminal block;

[0038] 6. Isolation plate. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention. It should be noted that, unless otherwise specified, the various features in the embodiments of this invention can be combined with each other, all of which are within the protection scope of this invention. Furthermore, although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed with a different module division or in a different order than that shown in the device schematic diagram or the flowchart.

[0040] In the description of this invention, it should be noted that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" are generally based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0041] In the description of this invention, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0042] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0043] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0044] This invention provides a battery pack 100, such as... Figure 1 and Figure 2 As shown, the battery pack 100 includes a housing 1, a cell assembly 2, a strap 3, a circuit board 4, a controller 5, and an isolation plate 6. The housing 1 is used to house the cell assembly 2, the strap 3, the circuit board 4, the controller 5, and the isolation plate 6; the cell assembly 2 is used to store or release electrical energy; the strap 3 is used to bind at least one cell assembly 2 together; the circuit board 4 is used to electrically connect multiple cell assemblies 2; the controller 5 is used to monitor parameters such as voltage, current, and temperature of the cell assembly 2, and also to control the charging and discharging of the cell assembly 2; the isolation plate 6 is used to separate the cell assembly 2 from the controller 5.

[0045] For the aforementioned housing 1, as Figure 2 As shown, the housing 1 includes a cylindrical body 11, an upper shell 12, and a bottom shell 13. Openings are provided at both the upper and lower ends of the cylindrical body 11. The upper shell 12 seals the opening at the upper end of the cylindrical body 11, and the lower shell seals the opening at the lower end of the cylindrical body 11. The bottom shell 13 is fixedly disposed on the cylindrical body 11, for example, by welding or bonding. The upper shell 12 is detachably disposed on the cylindrical body 11, for example, by screws. A sealing ring 14 can also be provided between the upper shell 12 and the cylindrical body 11 to enhance the sealing effect. In this embodiment, the housing 1 is cuboid in shape, with its inner wall surface set as a plane to accommodate the cuboid-shaped battery cell assembly 2, fully utilizing the space within the housing 1 and increasing the energy density of the battery pack 100.

[0046] For the aforementioned cylinder 11, as Figure 3As shown, the outer circumferential surface of the cylinder 11 is provided with multiple reinforcing ribs 111, which extend axially along the cylinder 11. These reinforcing ribs 111 are arranged at intervals along the circumference of the cylinder 11, meaning that multiple reinforcing ribs 111 are spaced apart on the outer side of the shell 1. By providing reinforcing ribs 111, the strength of the cylinder 11 can be enhanced, and the outer surface area of ​​the cylinder 11 can be increased, thereby increasing the contact area with air and improving the heat dissipation efficiency of the cylinder 11. Optionally, both the cylinder 11 and the bottom shell 13 are made of metal, such as aluminum, and the bottom shell 13 is directly welded to the cylinder 11. By making both the cylinder 11 and the bottom shell 13 of metal, the thermal conductivity of the bottom shell 13 of the cylinder 11 can be improved, which is beneficial for the heat dissipation of the battery pack 100.

[0047] In some embodiments, such as Figure 3 As shown, a connecting position 112 is formed between two adjacent reinforcing ribs 111, and internal threads are provided on opposite sides, so that after the screw passes through the upper shell 12, it can be installed in the connecting position 112 to install the upper shell 12 onto the cylinder 11. This eliminates the need for an additional mounting part for installing the screw, simplifying the structure of the cylinder 11, reducing production costs and weight; it also eliminates the need to open screw holes in the cylinder wall of the cylinder 11, so the thickness of the cylinder wall can be smaller than the diameter of the screw, which helps to reduce the weight of the shell 1 and reduce material costs.

[0048] Regarding the aforementioned upper shell 12, as Figure 4 As shown, the upper shell 12 is equipped with a handle 121, a vent valve 122, and an electrical connector 123. The handle 121 facilitates the handling of the battery pack 100; the vent valve 122 connects the interior of the shell 1 to the external environment, releasing pressure within the shell 1 and mitigating the risk of the battery pack 100 exploding; the electrical connector 123 connects to the battery cell assembly 2, facilitating the connection of external cables to the battery pack 100 for power and communication input and output, and enabling quick plugging and unplugging. Optionally, the upper shell 12 may be made of plastic, which provides insulation, reducing the risk of electric shock to users. Plastic is also easier to manufacture and mold, facilitating the installation of the handle 121, the vent valve 122, and the electrical connector 123.

[0049] Regarding the aforementioned bottom shell 13, as Figure 5 As shown, a foot pad 131 is provided on the side of the bottom shell 13 opposite to the cylinder 11, that is, a foot pad 131 is provided on the outer side of the shell 1. By providing the foot pad 131, the battery pack 100 can be supported, the wear area of ​​the bottom surface of the battery pack 100 can be reduced, and the battery pack 100 can also make multiple points of contact with the ground, making the battery pack 100 more stable when placed on the ground. Optionally, the foot pad 131 is a protrusion formed by stamping the bottom shell 13.

[0050] For the aforementioned battery cell assembly 2, such as Figure 2 As shown, multiple battery cell assemblies 2 are arranged along a first direction X to form a battery stack and are disposed inside a housing 1. The first direction X is the thickness direction of the battery cell assembly 2. The battery cell assembly 2 also has a width direction along a second direction Y and a length direction along a third direction Z.

[0051] like Figure 6 and Figure 7 As shown, the battery cell assembly 2 includes two heat sinks 21, a heat insulation structure 22, and two battery cells 23. The two heat sinks 21 are spaced apart along a first direction X. The heat insulation structure 22 is disposed between the two heat sinks 21. The battery cells 23 are cuboid in shape, and one battery cell 23 is correspondingly disposed between one heat sink 21 and one heat insulation structure 22. That is, the battery cell assembly 2 is arranged in the order of heat sink 21-battery cell 23-heat insulation structure 22-battery cell 23-heat sink 21. The two heat sinks 21, in conjunction with the heat insulation structure 22, respectively clamp the two battery cells 23. Optionally, the heat sinks 21 may be made of metal, such as aluminum, which has good thermal conductivity.

[0052] For the aforementioned heat sink 21, as Figure 6 As shown, the heat sink 21 includes a main body 211. The main body 211 has a first folded edge 212 and a second folded edge 213 on opposite sides along the second direction Y. The main body 211 has a third folded edge 214 on one side along the third direction Z. The first folded edge 212, the second folded edge 213 and the third folded edge 214 are all bent toward the other heat sink 21 to cooperate with the main body 211 to form an accommodating space. Thus, the accommodating space of the two heat sinks 21 in the same cell assembly 2 is located on the opposite side of the two heat sinks 21, that is, the inner side.

[0053] One accommodating space is used to accommodate one battery cell 23. Specifically, one battery cell 23 is disposed within one accommodating space, and the battery cell 23 is in thermal contact with the main body 211, the first folded edge 212, the second folded edge 213, and the third folded edge 214, and is in direct or indirect contact through planar bonding. Taking the battery cell 23 as a cuboid as an example, four of the six surfaces of the battery cell 23 are in thermal contact with the heat sink 21, and one surface is in thermal contact with the heat insulation structure 22. Thus, the heat sink 21 partially encloses the battery cell 23 through the main body 211, the first folded edge 212, the second folded edge 213, and the third folded edge 214, increasing the thermal contact area between the heat sink 21 and the battery cell 23 and improving the heat dissipation efficiency of the battery cell 23.

[0054] In the embodiments of this application, thermal contact refers to two objects coming into contact with each other through a heat-permeable wall, with heat transfer between the two objects. The two objects may not be in physical contact, and there may be other media between them.

[0055] In some embodiments, the first folded edge 212, the second folded edge 213, and the third folded edge 214 can also make thermal contact with the inner wall surface of the housing 1, directly transferring heat to the housing 1 for heat dissipation. This allows the heat from the battery cell 23 to be transferred to the housing 1 through the heat dissipation plate 21, improving the overall heat dissipation efficiency of the battery pack 100. Specifically, the two sides of each of the first folded edge 212, the second folded edge 213, and the third folded edge 214 make thermal contact with the battery cell 23 and the inner wall of the housing 1, respectively, acting as a heat transfer bridge between them. In this embodiment, the folded edges make direct contact with the battery cell 23 and the inner wall of the housing 1, or indirect contact through a thermally conductive medium. Therefore, the heat transfer distance is equal to the sum of the thickness of the folded edge and the thickness of the thermally conductive medium. Furthermore, when the battery cell assembly 2 comprises multiple cells arranged along the first direction X to form a stack, the main body portion 211 on both sides of the stack also makes thermal contact with the inner wall surface of the housing 1, increasing the thermal contact area between the battery cell assembly 2 and the housing 1 and improving thermal conductivity.

[0056] In practice, it is difficult for the folded edge to completely adhere to the battery cell 23 and the housing 1 when they are in direct contact. Incomplete adhesion significantly reduces heat transfer efficiency. Therefore, a thermally conductive medium is preferably provided between the folded edge and the battery cell 23 and the housing 1 to improve heat conduction; that is, the folded edge is indirectly in contact with the battery cell 23 and the housing 1. In some embodiments, when the folded edge is indirectly in contact with the battery cell 23 or the housing 1, the thickness of the thermally conductive medium is less than one-tenth of the folded edge width, or less than 3 mm. In this application, the thermally conductive medium is a thermally conductive adhesive layer formed by potting. This layer not only transfers heat from the battery cell 23 to the housing 1, but also allows the battery cell 23 to be fixed within the housing 1 by the thermally conductive adhesive. Furthermore, potting the thermally conductive adhesive within the housing 1 improves the sealing effect of the battery pack. Simultaneously, the thermally conductive adhesive acts as a buffer as the battery cell 23 expands due to temperature increases during operation.

[0057] In the above embodiments, since the main body 211, the first folded edge 212, the second folded edge 213, and the third folded edge 214 are all in direct contact with the inner wall of the battery cell 23 and the housing 1 or indirect contact through a heat-conducting medium, the position of the battery cell 23 relative to the heat sink 21 along the second direction Y and the third direction Z, and the position of the heat sink 21 relative to the housing 1 along the second direction Y and the third direction Z, by setting the first folded edge 212, the second folded edge 213, and the third folded edge 214, the position of the battery cell 23 and the position of the heat sink 21 can be defined, without the need for additional positioning parts, thus reducing production costs; since the first folded edge 212, the second folded edge 213, and the third folded edge 214 are sandwiched between the battery cell 23 and the housing 1, the gap between the inner wall of the housing 1 and the battery cell 23 can be shortened, increasing the space ratio of the battery cell 23 in the housing 1, making full use of the space in the housing 1, and thereby improving the energy density of the battery pack 100.

[0058] Furthermore, such as Figure 6As shown, the first fold 212, the second fold 213 and the third fold 214 are all perpendicular to the main body 211, which facilitates thermal contact with the outer surface of the battery cell 23 and the inner wall of the housing 1, and improves the thermal conductivity between the folds and the housing 1 and the battery cell 23.

[0059] Furthermore, such as Figure 6 As shown, the lengths of the first fold 212 and the second fold 213 along the third direction Z are equal to the lengths of the main body 211 along the third direction Z, and the length of the third fold 214 along the second direction Y is equal to the width of the main body 211 along the second direction Y. The lengths of the first fold 212, the second fold 213 and the third fold 214 are sufficiently extended to increase the thermal contact area with the battery cell 23 and the housing 1.

[0060] Furthermore, a thermally conductive layer (not shown) can be provided between the battery cell 23 and the heat sink 21, meaning that the battery cell 23 and the heat sink 21 are in indirect contact through a thermally conductive medium. The thermally conductive layer can be formed by applying thermally conductive adhesive between the battery cell 23 and the heat sink 21 and allowing it to cure. This can improve the problem of poor adhesion caused by uneven contact surfaces between the battery cell 23 and the heat sink 21, which leads to reduced thermal conductivity. In addition, the cured thermally conductive layer can also act as a buffer for the battery cell 23.

[0061] It is understood that the housing 1 that is in thermal contact with the folded edge can be the housing 1 of this application embodiment, or it can be other housing 1 that is not in this application embodiment, as long as the heat sink 21 is installed inside the housing 1 and the folded edge is in thermal contact with the inner wall of the housing 1.

[0062] In some other embodiments, the first fold 212, the second fold 213 and the third fold 214 may only have one or both of them in thermal contact with the battery cell 23 or the housing 1, which would reduce the heat dissipation and limiting effect.

[0063] It is understandable that, such as Figure 6 and Figure 7 As shown, the main body 211, the first folded edge 212, and the second folded edge 213 form a clearance opening 215 at one end away from the third folded edge 214. When a heat sink 21 and a heat insulation structure 22 clamp a battery cell 23, the clearance opening 215 and the heat insulation structure 22 form an opening at one end of the battery cell assembly 2, which is used for the tab 231 of the battery cell 23 to pass through. To support and fix the tab 231, the battery cell assembly 2 also includes a top sealing strip 24, which is disposed in the opening and fills the entire opening while allowing the tab 231 to pass through, thereby providing a fixed support for the tab 231. In the direction perpendicular to the third direction Z, it can provide buffer protection for the tab 231, and in the third direction Z, it can also provide buffer protection for the battery cell 23.

[0064] Since the tab 231 is located at the middle position of the cell 23 along the thickness direction, the tab 231 passes through the middle of the top seal 24. In this embodiment, as... Figure 6 and Figure 7 As shown, each tab 231 has a top sealing strip 24 on both sides. The top sealing strips on both sides of the tab 231 are located on the side of the tab 231 facing the heat sink 21 and the side of the tab 231 facing the heat insulation structure 22, respectively. The two top sealing strips 24 work together to clamp the tab 231, thus supporting and fixing the tab 231. Furthermore, the top sealing strip 24 can also isolate the battery cell 23 from the circuit board 4, reducing heat dissipation from the battery cell 23 to the circuit board 4 and mitigating the problem of the circuit board 4 being damaged by high temperatures. It is understandable that a strip-shaped through hole can be made in the middle of the top sealing strip 24 for the tab 231 to pass through. Optionally, the top sealing strip 24 is made of heat insulation material, such as aerogel or foam.

[0065] For the aforementioned thermal insulation structure 22, such as Figure 6 and Figure 7 As shown, the heat insulation structure 22 is located between the two heat dissipation plates 21, that is, between the two accommodating spaces. The length of the heat insulation structure 22 along the third direction Z and the width along the second direction Y can be equal to or greater than the length of the accommodating space along the third direction Z and the width along the second direction Y. In other words, the heat insulation structure 22 is located at least between the two accommodating spaces and the two battery cells 23 within the accommodating spaces, with the two battery cells 23 distributed at intervals through the heat insulation structure 22. The heat insulation structure 22 is used to block heat transfer between the two battery cells 23 in the same battery cell assembly 2, reducing mutual influence between the battery cells 23 and delaying the propagation of thermal runaway. Optionally, the material of the heat insulation structure 22 includes aerogel or foam, which has good heat insulation performance. Optionally, a heat insulation structure 22 can also be provided between two adjacent battery cell assemblies 2. Preferably, the heat insulation structure 22 is made of aerogel, which has good heat insulation effect and can play a certain buffering role when the battery cells 23 expand and contract with temperature.

[0066] In some embodiments, the heat insulation structure 22 is formed by injecting aerogel into the housing 1 and curing it, or by fixing the aerogel pad between two cells 23 in the same cell assembly 2. It not only fits tightly with the cell 23, but also plays a role in fixing and buffering the cell 23.

[0067] Regarding the aforementioned strap 3, as Figure 2 As shown, the straps 3 bind at least one battery cell assembly 2 together. In this embodiment, the straps 3 bind multiple battery cell assemblies 2 together to form a battery stack, which is disposed inside the housing 1. The straps 3 can be steel straps or PET straps, and the number of straps 3 can be one or more.

[0068] The circuit board 4 is housed within the casing 1 and is electrically connected to the tabs 231 of the battery cell assembly 2 to enable charging and discharging of the battery cell assembly 2. Figure 8 As shown, the circuit board 4 is provided with a first power connector 41 and a first communication connector 42. The first power connector 41 is used to connect a power cable and is electrically connected to the controller 5 through the power cable to transmit power. The first communication connector 42 is used to connect a communication cable and is electrically connected to the controller 5 through the communication cable to transmit information such as temperature and voltage of the battery cell 23 collected by the circuit board 4.

[0069] The circuit board 4 also abuts against the end of the battery cell assembly 2 where the tab 231 is provided, thereby cooperating with the housing 1 to clamp the battery cell assembly 2 and achieve the limitation of the battery cell assembly 2.

[0070] like Figure 8 As shown, the circuit board 4 has multiple sets of pressure relief holes 43. Each set of pressure relief holes 43 is connected to a battery cell 23. Each set of pressure relief holes 43 includes one or more pressure relief holes 43. Thus, when a battery cell 23 leaks, the leaked material and the high-temperature expanding gas can flow out from the pressure relief holes 43 to the side of the circuit board 4 away from the battery cell 23, without easily affecting adjacent battery cells 23. The high-temperature expanding gas can also flow out of the housing 1 from the vent valve 122 on the upper housing 12 to release the pressure inside the housing 1. The battery cell 23 can have a weak part set at the position corresponding to the pressure relief hole 43. When the internal pressure is too high, the battery cell 23 will break at the weak part, so that the leaked material and the high-temperature expanding gas can flow into the pressure relief hole 43 from the broken part.

[0071] In this embodiment, the circuit board 4 at least abuts against the top sealing strip 24. The top sealing strip 24 protrudes from or is flush with the heat sink 21 along the third direction Z. When the top sealing strip 24 is flush with the heat sink 21, the circuit board 4 abuts against both the top sealing strip 24 and the heat sink 21, thereby cooperating with the battery cell 23 to clamp the top sealing strip 24. At the same time, the top sealing strip 24 can provide buffer protection for the battery cell 23. Furthermore, the position of the pressure relief hole 43 corresponds to the gap between the two parts of the top sealing strip 24. When the battery cell 23 leaks, the leaked material flows out from the gap between the two parts of the top sealing strip 24 and then flows into the pressure relief hole 43. Optionally, the pressure relief hole 43 is provided at the edge of the circuit board 4, with one battery cell 23 corresponding to two pressure relief holes 43. In this application, a set of pressure relief holes 43 includes two pressure relief holes 43, which are located at both ends of the circuit board 4 and are both connected to the gap between the top sealing strips 24 on both sides of the same tab 231.

[0072] like Figure 8As shown, the circuit board 4 also has multiple vias 44, with one tab 231 passing through one via 44. The via 44 can be elongated to allow the tab 231 to pass through. On the side of the circuit board 4 away from the battery cell assembly 2, multiple conductive elements 45 are provided. The battery cell 23 is electrically connected to the conductive elements 45 through the tab 231. The conductive elements 45 can be made of metal, such as copper strips.

[0073] like Figure 8 As shown, a conductive element 45 is disposed adjacent to a via 44 for electrically connecting the tabs 231 of two adjacent battery cells 23, thereby connecting multiple battery cells 23 in series. Specifically, the arrangement directions of two adjacent battery cells 23 are opposite, that is, in two adjacent battery cells 23, the positive tab 231 corresponds to the negative tab 231; two adjacent battery cells 23 are connected in series through a conductive element 45, which is located between one positive tab 231 and one negative tab 231 of the two adjacent battery cells 23, thereby connecting the adjacent battery cells 23 in series; the conductive elements 45 are arranged alternately on the circuit board 4, for example, in a "W" shape, so that the positive tab 231 of the previous battery cell 23 can be connected to the negative tab 231 of the next battery cell 23 in sequence, or the negative tab 231 of the previous battery cell 23 can be connected to the positive tab 231 of the next battery cell 23 in sequence, thereby connecting multiple battery cells 23 in series in sequence. This method of connecting multiple battery cells 23 via circuit board 4 eliminates the need for additional wires, reducing production costs and assembly difficulty. It also improves the integration of the battery pack 100, reduces its size, and increases its energy density. The positive and negative electrode tabs 231, after passing through the through-hole 44, can be bent and pressed against the conductive component 45, and then connected to the conductive component 45 by welding, for example, using laser welding.

[0074] For the controller 5 mentioned above, such as Figure 9As shown, the controller 5 is housed within the housing 1, mounted on the side of the circuit board 4 facing away from the battery cell assembly 2, and electrically connected to the circuit board 4. Specifically, the controller 5 has a second power connector 51 and a second communication connector 52 corresponding to the circuit board 4. The second power connector 51 is used to connect a power cable and is electrically connected to the first power connector 41 of the circuit board 4 via the power cable to transmit power. The second communication connector 52 is used to connect a communication cable and is electrically connected to the first communication connector 42 of the circuit board 4 via the communication cable to receive information such as the temperature and voltage of the battery cell 23 collected by the circuit board 4. The controller 5 also has a third power connector 53 and a third communication connector 54 connected to the electrical connector 123 on the housing 1. The side of the electrical connector 123 facing inwards from the housing 1 has a connecting cable (not shown). The third power connector 53 and the third communication connector 54 are connected to the connecting cable of the electrical connector 123 to electrically connect the controller 5 to the electrical connector 123, thereby enabling the input and output of power and communication information with external devices through the electrical connector 123. In this embodiment, the controller 5 is a BMS (Battery Management System), which can protect the safe use of the battery pack 100 and extend the service life of the battery pack 100 while ensuring safety during the charging and discharging process.

[0075] Regarding the aforementioned isolation plate 6, as Figure 2 As shown, the isolation plate 6 is disposed inside the housing 1, installed on the side of the circuit board 4 opposite to the battery cell assembly 2, and located between the controller 5 and the circuit board 4. It can block leakage from the battery cell 23, mitigating the problem of leakage from the battery cell 23 splashing onto the controller 5 and causing damage. The controller 5 can be directly mounted on the isolation plate 6, thus providing insulation between the controller 5 and the circuit board 4. Optionally, the isolation plate 6 is made of insulating material, such as a plastic plate. Specifically, the isolation plate 6 is attached to the circuit board 4 and covers all through holes 44 and conductive parts 45. Two pressure relief holes 43 in the same group are located on opposite sides of the isolation plate 6. When debris from a damaged or exploded battery cell 23 is ejected from the pressure relief holes 43, the isolation plate 6 can prevent the debris from entering other battery cell assemblies 2 through the through holes 44 and prevent the debris from falling onto the conductive parts 45, thus avoiding short circuits.

[0076] In some embodiments, the gap between the cell assembly 2 and the inner wall of the housing 1 can be filled with a thermally conductive material (not shown), that is, the cell assembly 2 and the inner wall of the housing 1 can achieve thermal contact indirectly through a thermally conductive medium; the gaps between multiple cell assemblies 2 can also be filled with a thermally conductive material, that is, multiple cell assemblies 2 can achieve thermal contact indirectly through a thermally conductive medium, thereby further increasing the thermal conductivity between the cell assembly 2 and the housing 1, and also serving to fix the cell assembly 2 inside the housing 1, improving the overall strength of the battery pack 100, and improving the waterproof performance of the battery pack 100. Optionally, the thermally conductive material is a thermally conductive adhesive that is injected into the housing 1 and cured.

[0077] This invention also provides an electrical device, which includes the battery pack 100 described above. The beneficial effects of the structure of the battery pack 100 are not repeated here. The electrical device can be an electric car, an electric bicycle, or other electrical devices, and is not limited thereto.

[0078] The battery cell assembly 2, battery pack 100, and electrical equipment of this embodiment of the invention are provided with a heat dissipation plate 21. The heat dissipation plate 21 partially wraps around the battery cell 23 through the main body 211, the first folded edge 212, the second folded edge 213, and the third folded edge 214 to increase the thermal contact area with the battery cell 23, thereby improving the heat dissipation efficiency of the battery cell 23. Furthermore, when the heat dissipation plate 21 is installed on the housing 1, the first folded edge 212, the second folded edge 213, the third folded edge 214, and the main body 211 on both sides of the battery pack can also make thermal contact with the housing 1, thereby transferring heat to the housing 1 for heat dissipation, thus improving the heat dissipation efficiency of the battery pack 100. The heat dissipation efficiency is improved; a heat-conducting layer is provided between the battery cell 23 and the heat sink 21 to improve the heat conduction efficiency between the heat sink 21 and the battery cell 23; a heat-conducting material is provided between the battery cell assembly 2 and the housing 1 to improve the heat conduction efficiency between the battery cell assembly 2 and the housing 1; a reinforcing rib 111 is provided on the outside of the housing 1 to enhance the strength of the cylinder 11, increase the outer surface area of ​​the cylinder 11, increase the contact area with air, and improve the heat dissipation efficiency of the housing 1; both the housing 1 and the heat sink 21 are made of metal, which has good thermal conductivity and strength, which can improve the heat dissipation performance and ensure the overall strength of the battery pack 100.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; under the concept of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the present invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized by, The battery pack includes a housing and battery cell assemblies, wherein a plurality of battery cell assemblies are arranged along a first direction to form a battery stack and disposed within the housing; The battery cell assembly includes: The heat sink includes two heat sinks spaced apart along a first direction. Each heat sink includes a main body. The main body has a first flange and a second flange on opposite sides along a second direction. The main body has a third flange on one side along a third direction. The first flange, the second flange, and the third flange are all bent toward the other heat sink to cooperate with the main body to form an accommodating space. The first flange, the second flange, the third flange, and the main body on both sides of the fuel cell stack are all in thermal contact with the housing. A battery cell, wherein a battery cell is correspondingly disposed within one of the accommodating spaces, and the battery cell is in thermal contact with the main body, the first folded edge, the second folded edge, and the third folded edge; and A heat insulation structure is at least partially disposed between two of the battery cells, and the two battery cells are spaced apart by the heat insulation structure; when multiple battery cell assemblies are arranged to form a battery stack, the heat insulation structure is also provided between two adjacent battery cell assemblies. The main body, the first folded edge, and the second folded edge form a clearance opening at one end opposite to the third folded edge; the electrode tab of the battery cell protrudes from the heat sink through the clearance opening; the battery cell assembly also includes a top sealing strip, which fills the gap between the clearance opening and the electrode tab; the top sealing strip is respectively provided on both sides of the electrode tab, and the top sealing strips on both sides cooperate to clamp the electrode tab; the top sealing strip is made of heat-insulating material; the gap between the battery cell assembly and the inner wall of the housing is filled with a heat-conducting material, and the gap between the battery cell assemblies is also filled with a heat-conducting material.

2. The battery pack according to claim 1, characterized in that, The battery pack also includes a circuit board disposed inside the housing, and the circuit board is electrically connected to the tabs of the battery cell assembly; The circuit board has multiple sets of pressure relief holes, each set of pressure relief holes is connected to one of the battery cells, and each set of pressure relief holes includes one or more pressure relief holes. The housing is provided with a vent valve for relieving pressure inside the housing.

3. The battery pack according to claim 2, characterized in that, The circuit board abuts against one end of the battery cell assembly where the tab is provided. The circuit board has multiple through holes, and one tab passes through one of the through holes. The circuit board is provided with multiple conductive elements, and the battery cell is electrically connected to the conductive elements through the electrode tab, so that multiple battery cells are connected in series.

4. The battery pack according to claim 2, characterized in that, The battery pack also includes a controller and an isolation plate, both of which are disposed within the housing. The controller is electrically connected to the circuit board, and the isolation plate is disposed between the controller and the circuit board.

5. The battery pack according to claim 1, characterized in that, The outer surface of the shell is provided with multiple reinforcing ribs at intervals; And / or, a handle is provided on the outer side of the housing; And / or, the outer side of the housing is provided with foot pads; And / or, the housing is provided with an electrical connector, which is electrically connected to the controller; And / or, the material of the housing includes metal.

6. The battery pack according to any one of claims 1 to 5, characterized in that, The battery pack also includes straps that bind at least one of the battery cell components together.

7. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 6.

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