Heating device, electrochemical device, and electric appliance

Abstract

The application discloses a heating device, an electrochemical device and an electric equipment. The heating device comprises at least two heating bodies, at least one conductive part and a first insulating part. The plurality of heating bodies are arranged in a spaced manner along a first direction, and a gap exists between the two adjacent heating bodies. The two adjacent heating bodies are connected through the conductive part, the conductive part is separated from the gap, and the insulating part covers at least part of the surface of the heating body. The heating device is arranged in a spaced manner along the first direction through the plurality of heating bodies, and the gap is formed, so that the heating device is bent and deformed in the gap region between the adjacent heating bodies. The conductive part connected with the two adjacent heating bodies is separated from the gap, the conductive part is separated from the main part of the battery cell when the heating device is assembled in the electrochemical device, and the heating device is further bent and deformed, so that the assembly efficiency of the electrochemical device is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a heating device, an electrochemical device, and an electrical device. Background Technology

[0002] Currently, with the booming development of the new energy industry, the application environment of electrochemical devices is becoming increasingly complex. When electrochemical devices are in low-temperature environments, the low temperature can affect their charge and discharge performance. To reduce the impact of low temperatures on electrochemical devices, heating devices are usually installed between different cells within the device to regulate the cell temperature. However, heat-conducting devices are typically not easy to bend and are not conducive to assembly. Summary of the Invention

[0003] In view of the above situation, it is necessary to provide a heating device that is easy to bend in order to improve the assembly efficiency of the electrochemical device containing the heating device.

[0004] Embodiments of this application provide a heating device including at least two heating bodies, at least one conductive part, and an insulating member. The plurality of heating bodies are arranged at intervals along a first direction, with gaps existing between adjacent heating bodies. Adjacent heating bodies are connected by conductive parts, which are separate from the gaps. The insulating member covers at least a portion of the surface of the heating bodies.

[0005] In the above-mentioned heating device, multiple heating bodies are arranged at intervals along the first direction and form gaps, which facilitates the bending and deformation of the heating device in the gap area between adjacent heating bodies. The conductive part connecting two adjacent heating bodies is separated from the gap. When the heating device is assembled in the electrochemical device, the conductive part and the main body of the battery cell can be separated, which further facilitates the bending and deformation of the heating device and improves the assembly efficiency of the electrochemical device.

[0006] In some embodiments of this application, the heating device further includes at least one insulating connection portion located between and connecting two adjacent heating bodies. The insulating connection portion helps improve the connection stability between adjacent heating bodies and reduces the risk of damage to the heating device.

[0007] In some embodiments of this application, an insulating connection portion is provided on the insulating member.

[0008] In some embodiments of this application, the insulating connection and the insulating component are integrally formed, which helps to simplify the assembly process of the heating device and improve the processing and manufacturing efficiency of the heating device.

[0009] In some embodiments of this application, the insulating element includes a first insulating element that covers the entire surface of the heating body, which helps to reduce the risk of the heating body being damaged by external objects and to reduce the risk of short circuit in the heating device.

[0010] In some embodiments of this application, the insulating element includes a second insulating element that covers the entire surface of the conductive part, which helps to reduce the risk of the conductive part being damaged by foreign objects and to reduce the risk of short circuit in the heating device.

[0011] In some embodiments of this application, the first insulating member and the second insulating member are integrally formed, which helps to further simplify the assembly process of the heating device and improve the processing and manufacturing efficiency of the heating device.

[0012] Embodiments of this application also provide an electrochemical device, including a battery cell assembly and a heating device as described in any of the foregoing embodiments, wherein the heating device is connected to the battery cell assembly.

[0013] In the aforementioned electrochemical device, the heating device is arranged with multiple heating bodies spaced apart along a first direction, forming gaps. This facilitates the bending and deformation of the heating device in the gap area between adjacent heating bodies. Furthermore, the conductive part connecting two adjacent heating bodies is separated from the gap, which further facilitates the bending and deformation of the heating device and improves the assembly efficiency of the electrochemical device.

[0014] In some embodiments of this application, the battery cell assembly includes a plurality of battery cells, each battery cell including a main body, an electrode assembly and an electrode terminal, a portion of the electrode terminal being located within a housing and connected to the electrode assembly, and a portion of the electrode terminal extending out of the housing, the housing including the main body, and the electrode assembly being housed within the main body.

[0015] In some embodiments of this application, the heating element is connected to the main body and can heat the main body to improve the charging and discharging performance of the battery cell.

[0016] In some embodiments of this application, the conductive part and the main body are separated, and the conductive part is bent relative to the heating body, so that the heating device is bent in the conductive part and the gap area, so that part of the heating body is connected between adjacent cells to heat the cells; at the same time, the heating device is bent in the gap area, so that the gap area is located on the side of the cell, which helps to reduce the risk of the heating body burning out.

[0017] In some embodiments of this application, the battery cell further includes a sealing portion extending from the body portion, and electrode terminals extending from the sealing portion out of the body portion. Multiple battery cells are stacked, and along the stacking direction of the battery cells, at least one portion of a heating body is located between adjacent body portions. The heating body can simultaneously heat both body portions to improve the charge / discharge performance of two adjacent battery cells.

[0018] In some embodiments of this application, at least one portion of the conductive part is located between adjacent sealing parts, which helps to reduce the impact of cell expansion deformation on the conductive part and reduce the risk of damage to the heating device due to cell expansion.

[0019] In some embodiments of this application, the heating device further includes a first connection end and a second connection end, the first connection end being electrically connected to the heating body, the second connection end being electrically connected to the heating body, and the first and second connection ends being configured to be electrically connected to a power source to provide electrical energy to the heating body.

[0020] In some embodiments of this application, the heating device further includes a control switch connected to a first connection terminal or a second connection terminal. The control switch is configured to detect the temperature of the electrode terminals, which helps to reduce the risk of thermal failure of the battery cell.

[0021] In some embodiments of this application, along the stacking direction of the cells, the control switch is connected to the electrode terminal on the outermost cell, which helps to reduce the risk of thermal failure of the cells.

[0022] In some embodiments of this application, the electrochemical device further includes a third insulating member, which includes a bottom wall and a plurality of side walls connected to the bottom wall. The bottom wall and the plurality of side walls form a receiving cavity, the opening of which faces the main body. The portion of the electrode terminal extending out of the sealing portion is located within the receiving cavity, which helps to reduce the risk of damage to the electrode terminal.

[0023] In some embodiments of this application, a first slot is provided on the side wall away from the receiving cavity; the heating device further includes a first connecting end connected to the heating body, the first connecting end being disposed in the first slot and extending to the bottom wall away from the main body. The first slot can fix and limit the first connecting end, which helps to reduce the risk of shaking damage to the first connecting end.

[0024] In some embodiments of this application, the electrochemical device further includes a first circuit board, a first connection terminal connected to the first circuit board, and the first circuit board is configured to provide an electrical path to the heating device.

[0025] In some embodiments of this application, the electrochemical device further includes a total positive connection and a total negative connection. The total positive connection connects the battery cell assembly and the first circuit board, and the total negative connection connects the battery cell assembly and the first circuit board, such that the first circuit board is electrically connected to the battery cell assembly and can control the charging and discharging of the battery cell assembly.

[0026] In some embodiments of this application, the electrochemical device further includes a second circuit board disposed within a receiving cavity and connected to electrode terminals, the second circuit board being configured to acquire electrical signal information of the battery cell.

[0027] Embodiments of this application also provide an electrical device, including the electrochemical device in any of the foregoing embodiments.

[0028] In the aforementioned electrical equipment, the heating device in the electrochemical device is arranged with multiple heating bodies spaced apart along a first direction, forming gaps. This facilitates the bending and deformation of the heating device in the gap area between adjacent heating bodies. Furthermore, the conductive part connecting two adjacent heating bodies is separated from the gap, which further facilitates the bending and deformation of the heating device, improves the assembly efficiency of the electrochemical device, saves the manufacturing cost of the electrochemical device, and reduces the impact of the cost of the electrochemical device on the electrical equipment. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the heating device in one embodiment of this application.

[0030] Figure 2 This is a cross-sectional view of the heating device along a direction perpendicular to a third party in one embodiment of this application.

[0031] Figure 3 This is one embodiment of the present application. Figure 1 View of section III-III shown.

[0032] Figure 4 This is a schematic diagram of the structure of an electrochemical device in one embodiment of this application.

[0033] Figure 5 This is one embodiment of the present application. Figure 4 The view shown is of section VV.

[0034] Figure 6 This is an exploded view of an electrochemical device in one embodiment of this application.

[0035] Figure 7 This is a schematic diagram of the structure of the heating device connected to the battery cell assembly in one embodiment of this application.

[0036] Figure 8 This is a schematic diagram of the battery cell structure in one embodiment of this application.

[0037] Figure 9 This is a schematic diagram of the structure of the electrode assembly in one embodiment of this application.

[0038] Figure 10 This is a partial structural schematic diagram of an electrochemical device in one embodiment of this application.

[0039] Figure 11 yes Figure 10 A magnified view of a portion of region XI shown.

[0040] Figure 12 This is a schematic diagram of the structure of the third insulating element in one embodiment of this application.

[0041] Figure 13This is another view of the third insulating element in one embodiment of this application.

[0042] Figure 14 This is a view along the sixth direction of a portion of the structure of the electrochemical device in one embodiment of this application.

[0043] Figure 15 yes Figure 14 A magnified view of the XV region shown.

[0044] Figure 16 This is a cross-sectional view of the electrochemical device along a fifth direction in one embodiment of this application.

[0045] Figure 17 yes Figure 16 A magnified view of a portion of region XVII shown.

[0046] Figure 18 This is a schematic diagram of the structure of an electrical device in one embodiment of this application.

[0047] Explanation of main component symbols

[0048] Electrochemical device 100

[0049] Heating device 10

[0050] Heating element 11

[0051] Area 111

[0052] Second area 112

[0053] Conductive part 12

[0054] Insulating component 13

[0055] First insulating component 131

[0056] Second insulating component 132

[0057] Gap 14

[0058] Insulating connection part 15

[0059] First insulating part 151

[0060] Second insulation part 152

[0061] First connection end 16

[0062] Second connection end 17

[0063] Control switch 18

[0064] Casing 20

[0065] First Wall 21

[0066] First groove 211

[0067] Second groove 212

[0068] Second Wall 22

[0069] Third Wall 23

[0070] Fourth Wall 24

[0071] Fifth Wall 25

[0072] Sixth Wall 26

[0073] 30 battery cell components

[0074] Cell 31

[0075] Casing 311

[0076] Main body 3111

[0077] Sealing part 3112

[0078] Top sealing section 31121

[0079] Side sealing part 31122

[0080] Electrode assembly 312

[0081] Electrode terminal 313

[0082] Positive electrode terminal 3131

[0083] Negative electrode terminal 3132

[0084] First circuit board 41

[0085] Second circuit board 42

[0086] Third insulating component 50

[0087] Bottom wall 51

[0088] First through hole 511

[0089] Second through hole 512

[0090] Third through hole 513

[0091] First sidewall 52

[0092] First slot 521

[0093] Second card slot 522

[0094] Second side wall 53

[0095] Third sidewall 54

[0096] Fourth sidewall 55

[0097] Containment cavity 56

[0098] General positive connection part 61

[0099] Total negative connection part 62

[0100] Wire harness 70

[0101] 200 electrical appliances

[0102] First direction X

[0103] Second direction Y

[0104] Third direction Z

[0105] Fourth direction P

[0106] Fifth direction Q

[0107] Sixth direction W

[0108] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this application. Detailed Implementation

[0109] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0110] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element present. When an element is considered to be "set" on another element, it can be directly set on the other element or there may be an intervening element present. In this application, unless otherwise expressly specified and limited, the terms "installed," "connected," "linked," "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0111] 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 to which this application belongs. The terminology used herein 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. The terms "comprising" and "equivalent to," and any variations thereof, in the specification, claims, and foregoing description of the drawings, are intended to cover non-exclusive inclusion.

[0112] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0113] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. Where there is no conflict, the various embodiments in this application can be combined with each other.

[0114] It should be noted that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative examples and should not constitute any limitation on this application.

[0115] Embodiments of this application provide a heating device including at least two heating bodies, at least one conductive part, and a first insulating member. The plurality of heating bodies are arranged at intervals along a first direction, with gaps between adjacent heating bodies. Adjacent heating bodies are connected by the conductive part, which is separate from the gap. The insulating member covers at least a portion of the surface of the heating bodies.

[0116] In the above-mentioned heating device, multiple heating bodies are arranged at intervals along the first direction and form gaps, which facilitates the bending and deformation of the heating device in the gap area between adjacent heating bodies. The conductive part connecting two adjacent heating bodies is separated from the gap. When the heating device is assembled in the electrochemical device, the conductive part and the main body of the battery cell can be separated, which further facilitates the bending and deformation of the heating device and improves the assembly efficiency of the electrochemical device.

[0117] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0118] like Figures 1 to 3As shown, an embodiment of this application provides a heating device 10, including at least two heating bodies 11, at least one conductive portion 12, and an insulating member 13. The plurality of heating bodies 11 are arranged at intervals along a first direction X, and a gap 14 exists between adjacent heating bodies 11. Adjacent heating bodies 11 are connected by the conductive portion 12, the conductive portion 12 and the gap 14 are separate, and the insulating member 13 covers at least a portion of the surface of the heating body 11.

[0119] In the heating device 10 described above, multiple heating bodies 11 are arranged at intervals along the first direction X, forming gaps 14. This facilitates the bending and deformation of the heating device 10 in the gap 14 region between adjacent heating bodies 11. The conductive part 12 connecting two adjacent heating bodies 11 is separated from the gap 14. When the heating device 10 is assembled into the electrochemical device 100, the conductive part 12 and the main body 3111 of the battery cell 31 can be separated, which further facilitates the bending and deformation of the heating device 10 and improves the assembly efficiency of the electrochemical device 100.

[0120] Figure 1 This is a schematic diagram of the heating device 10 before it is bent. Figure 2 This is a schematic diagram of the heating device 10 before it is bent. For ease of description, filler lines have been added to the heating body 11 and the conductive part 12.

[0121] In one embodiment, at least a portion of the conductive portion 12 extends beyond the heating body 11 along the second direction Y. When the heating device 10 is assembled into the electrochemical device 100, the heating body 11 can be positioned between the main body portions 3111 of adjacent battery cells 31, and the conductive portion 12 extends beyond the main body portions 3111. This not only facilitates heating of the battery cells 31 by the heating body 11 but also facilitates bending and deformation of the conductive portion 12, thereby improving the assembly efficiency of the electrochemical device 100. The second direction Y is perpendicular to the first direction X.

[0122] In one embodiment, the insulating member 13 includes a first insulating member 131, which covers the entire surface of the heating body 11. The first insulating member 131 helps to provide insulation and protection, reducing the risk of the heating body 11 being damaged by external objects and reducing the risk of short circuit in the heating device 10.

[0123] In one embodiment, the first insulating member 131 is formed on the surface of the heating body 11 by melting and solidifying plastic through an injection molding machine. This simplifies the process of connecting the first insulating member 131 to the heating body 11, improves assembly efficiency, enhances the stability of the connection between the first insulating member 131 and the heating body 11, reduces the risk of the first insulating member 131 falling off the heating body 11, and helps control the thickness of the first insulating member 131, thus reducing the impact of the thickness of the first insulating member 131 on the heating effect of the heating device 10.

[0124] In one embodiment, the first insulating element 131 is coated on the surface of the heating body 11, which helps to improve the stability of the connection between the first insulating element 131 and the heating body 11 and reduce the risk of the first insulating element 131 falling off the heating body 11.

[0125] In one embodiment, the first insulating member 131 is formed by coating the surface of the heating body 11 with insulating adhesive with good thermal conductivity and then curing it. This helps to further improve the stability of the connection between the first insulating member 131 and the heating body 11 and reduce the risk of the first insulating member 131 falling off the heating body 11.

[0126] In one embodiment, the first insulating element 131 includes an insulating film that covers the entire surface of the heating body 11.

[0127] In one embodiment, the first insulating element 131 includes, but is not limited to, any one of silicone thermally conductive adhesive, epoxy resin AB adhesive, polyurethane adhesive, polyurethane thermally and electrically conductive adhesive, and thermally conductive silicone grease.

[0128] In one embodiment, the insulating member 13 further includes a second insulating member 132, which covers the entire surface of the conductive part 12. The second insulating member 132 helps to provide insulation protection, reduce the risk of the conductive part 12 being damaged by foreign objects, and reduce the risk of short circuit in the heating device 10.

[0129] In one embodiment, the second insulating member 132 is formed on the surface of the conductive part 12 by melting and solidifying plastic using an injection molding machine. This simplifies the process of connecting the second insulating member 132 to the conductive part 12, improves assembly efficiency, enhances the stability of the connection between the second insulating member 132 and the conductive part 12, reduces the risk of the second insulating member 132 detaching from the conductive part 12, and helps control the thickness of the second insulating member 132, thus reducing the impact of the thickness of the second insulating member 132 on the bending efficiency of the conductive part 12.

[0130] In one embodiment, the second insulating member 132 is coated on the surface of the conductive part 12, which helps to improve the stability of the connection between the second insulating member 132 and the conductive part 12 and reduce the risk of the second insulating member 132 falling off the conductive part 12.

[0131] In one embodiment, the second insulating member 132 is formed by coating the surface of the conductive part 12 with an insulating adhesive with good thermal conductivity and then curing it. This helps to further improve the stability of the connection between the second insulating member 132 and the conductive part 12 and reduce the risk of the second insulating member 132 falling off the conductive part 12.

[0132] In one embodiment, the second insulating member 132 includes an insulating film that covers the entire surface of the conductive portion 12.

[0133] In one embodiment, the second insulating element 132 includes, but is not limited to, any one of silicone thermally conductive adhesive, epoxy resin AB adhesive, polyurethane adhesive, polyurethane thermally and electrically conductive adhesive, and thermally conductive silicone grease.

[0134] In one embodiment, the first insulating member 131 and the second insulating member 132 are integrally formed, which helps to further simplify the assembly process of the heating device 10 and improve the processing and manufacturing efficiency of the heating device 10.

[0135] In one embodiment, the first insulating member 131 and the second insulating member 132 are integrally formed insulating films.

[0136] In one embodiment, the heating device 10 further includes at least one insulating connection portion 15, at least a portion of which is located between two adjacent heating bodies 11 and connects the two adjacent heating bodies 11. The insulating connection portion 15 helps to improve the connection stability between adjacent heating bodies 11 and reduces the risk of damage to the heating device 10.

[0137] In one embodiment, the insulating connection portion 15 is disposed on the first insulating member 131. For example, the insulating connection portion 15 is bonded to the first insulating member 131.

[0138] In one embodiment, the insulating connection portion 15 is integrally formed with the first insulating member 131, which helps to simplify the assembly process of the heating device 10 and improve the processing and manufacturing efficiency of the heating device 10.

[0139] In one embodiment, the insulating connection portion 15 includes a first insulating portion 151, which is separate from the conductive portion 12 and arranged along a second direction Y. At least a portion of the gap 14 is located between the first insulating portion 151 and the conductive portion 12.

[0140] In one embodiment, the insulating connection portion 15 further includes a second insulating portion 152. Viewed along the first direction X, the second insulating portion 152 is separate from the first insulating portion 151 and arranged along the second direction Y. By providing the second insulating portion 152, it is beneficial to further improve the connection stability between adjacent heating bodies 11 and reduce the risk of damage to the heating device 10.

[0141] In one embodiment, a portion of the gap 14 is located between the first insulating portion 151 and the second insulating portion 152.

[0142] In one embodiment, the heating body 11 includes a first region 111 and a second region 112, which are arranged along a first direction X, and the heating powers of the first region 111 and the second region 112 are different. When the heating device 10 is working in the electrochemical device 100, different positions of the battery cell 31 can be heated separately by the first region 111 and the second region 112, thereby reducing the temperature difference between different positions of the battery cell 31 by using different heating powers. The heating power of the first region 111 is the average heating power, and the heating power of the second region 112 is the average heating power. The average heating power is the sum of the heating powers per unit area divided by the total sum of the heating powers per unit area.

[0143] In one embodiment, along the first direction X, the first region 111 is closer to the center of the heating body 11 than the second region 112, and the heating power of the first region 111 is greater than that of the second region 112. When the heating device 10 is operating within the electrochemical device 100, the first region 111 heats the center of the battery cell 31, and the second region 112 heats the edges of the battery cell 31. This facilitates uniform heating of all areas of the battery cell 31 and reduces the temperature difference between different areas of the battery cell 31.

[0144] like Figures 4 to 7 As shown, embodiments of this application also provide an electrochemical device 100, including a housing 20, a battery cell assembly 30, and a heating device 10 as described in any of the foregoing embodiments. The battery cell assembly 30 and the heating device 10 are disposed within the housing 20, and the heating device 10 is connected to the battery cell assembly 30.

[0145] In the electrochemical device 100 described above, the heating device 10 is arranged with multiple heating bodies 11 spaced apart along the first direction X, forming a gap 14. This facilitates the bending and deformation of the heating device 10 in the gap 14 region between adjacent heating bodies 11. Furthermore, the conductive part 12 connecting two adjacent heating bodies 11 is separated from the gap 14, which further facilitates the bending and deformation of the heating device 10 and improves the assembly efficiency of the electrochemical device 100.

[0146] In one embodiment, the outer casing 20 includes a first wall 21, a second wall 22, a third wall 23, a fourth wall 24, a fifth wall 25, and a sixth wall 26. The first wall 21 and the third wall 23 are arranged in a specific order, the second wall 22 and the fourth wall 24 are arranged in a specific order, and the fifth wall 25 and the sixth wall 26 are arranged in a specific order. The fifth wall 25 and the sixth wall 26 are both connected to the first wall 21, the second wall 22, the third wall 23, and the fourth wall 24.

[0147] In one embodiment, the battery cell assembly 30 includes a plurality of battery cells 31, which are stacked together. The fourth direction P is the stacking direction of the plurality of battery cells 31. A portion of the heating body 11 is located between two adjacent battery cells 31 and connected to the two battery cells 31. The heating body 11 can heat the two battery cells 31 simultaneously to improve the charging and discharging performance of the two battery cells 31.

[0148] In one embodiment, the conductive part 12 is bent relative to the heating body 11, causing the heating device 10 to bend in the conductive part 12 and the gap 14 region, so that part of the heating body 11 is located between two adjacent battery cells 31 to heat the two battery cells 31. Simultaneously, the heating device 10 is bent in the gap 14 region, placing the gap 14 region on the side of the battery cell 31, which helps reduce the risk of the heating body 11 burning out. Burning out the heating body 11 refers to the situation where, when heating, the heating body 11 does not contact other objects to conduct heat away, causing heat to accumulate on the heating body 11, which is detrimental to the safety of the electrochemical device 100.

[0149] In one embodiment, the battery cell 31 includes a housing 311, an electrode assembly 312, and an electrode terminal 313. The electrode assembly 312 is disposed inside the housing 311, a portion of the electrode terminal 313 is located inside the housing 311 and connected to the electrode assembly 312, and a portion of the electrode terminal 313 extends out of the housing 311.

[0150] In one embodiment, cell 31 includes a prismatic cell.

[0151] In one embodiment, the battery cell 31 includes a cylindrical battery cell.

[0152] In one embodiment, the housing 311 includes a main body portion 3111 and a sealing portion 3112 connected to each other. The sealing portion 3112 extends from the main body portion 3111, the electrode assembly 312 is housed within the main body portion 3111, and the electrode terminal 313 extends out of the housing 311 from the sealing portion 3112.

[0153] In one embodiment, the sealing portion 3112 includes a top sealing portion 31121 and a side sealing portion 31122 connected to each other. The top sealing portion 31121 is located at the end of the main body portion 3111 along the fifth direction Q, and the side sealing portion 31122 is located at the end of the main body portion 3111 along the sixth direction W. The electrode terminal 313 extends out of the housing 311 from the top sealing portion 31121.

[0154] In one embodiment, there are two side sealing portions 31122, which are located at opposite ends of the main body portion 3111 along the sixth direction W. The top sealing portion 31121 is located between and connects the two side sealing portions 31122. The sixth direction W is perpendicular to both the fourth direction P and the fifth direction Q.

[0155] In one embodiment, the electrode assembly 312 includes a positive electrode, a negative electrode, and a separator (not shown). The separator is disposed between the positive electrode and the negative electrode. The positive electrode, the separator, and the negative electrode are wound or stacked to form the electrode assembly 312.

[0156] In one embodiment, the electrode terminal 313 includes a positive electrode terminal 3131 and a negative electrode terminal 3132, with the positive electrode terminal 3131 connected to the positive electrode plate and the negative electrode terminal 3132 connected to the negative electrode plate.

[0157] In one embodiment, the positive electrode terminal 3131 and the negative electrode terminal 3132 are located on the same side of the main body 3111 along the fifth direction Q.

[0158] In one embodiment, the positive electrode terminal 3131 and the negative electrode terminal 3132 are located at opposite ends of the main body portion 3111 along the fifth direction Q (not shown).

[0159] As an example, the following description will take the case where the positive electrode terminal 3131 and the negative electrode terminal 3132 are located on the same side of the main body 3111 along the fifth direction Q as an example.

[0160] like Figure 5 , Figure 7 , Figure 10 and Figure 11 As shown, in one embodiment, along the fourth direction P, at least one heating body 11 is located between two adjacent main body portions 3111 and connects the two main body portions 3111. By connecting the main body portions 3111, the heating body 11 can heat the main body portions 3111 to improve the charging and discharging performance of the battery cell 31.

[0161] In one embodiment, along the fourth direction P, the projection of the heating body 11 is located within the projection of the main body 3111, which is beneficial for the heating body 11 to heat the main body 3111.

[0162] In one embodiment, along the fourth direction P, the projection of the main body 3111 is located within the projection of the heating body 11, which is beneficial for the heating body 11 to heat various parts of the main body 3111 and improve the heating effect of the heating device 10 on the battery cell 31.

[0163] In one embodiment, the heating body 11 is connected to the main body 3111 via a first insulating member 131 on its surface, which helps to reduce the impact of the thickness of the heating device 10 on the stacking thickness of the battery cell assembly 30.

[0164] In one embodiment, the electrochemical device 100 further includes a thermally conductive medium (not shown) located between the first insulating member 131 and the main body 3111 on the surface of the heating body 11, and connecting the first insulating member 131 and the main body 3111. The thermally conductive medium helps to improve heat exchange between the heating body 11 and the main body 3111, thereby improving the heating effect of the heating device 10 on the battery cell 31. For example, the thermally conductive medium can be a thermally conductive adhesive.

[0165] In one embodiment, the conductive portion 12 and the main body portion 3111 are separated and arranged along the fifth direction Q. Along the sixth direction W, the projection of the conductive portion 12 overlaps with the projection of the top sealing portion 31121. Along the fourth direction P, two adjacent top sealing portions 31121 are separated. When the battery cell assembly 30 expands and deforms, the expansion and deformation mainly occur in the region of the main body portion 3111, while the conductive portion 12 is located in the region of the top sealing portion 31121. This helps to reduce the impact of the expansion and deformation of the battery cell 31 on the conductive portion 12 and reduces the risk of damage to the heating device 10 due to the expansion of the battery cell 31.

[0166] In one embodiment, along the fourth direction P, at least one portion of the conductive part 12 is located between two adjacent top seals 31121.

[0167] In one embodiment, a protective member (not shown) is provided on the conductive part 12. At least a portion of the protective member is located between the conductive part 12 and the outer casing 20. The protective member provides protection and reduces the risk of damage to the conductive part 12 from other structures. In one embodiment, the protective member is adhesively bonded to the conductive part 12, which improves the stability of the connection between the protective member and the conductive part 12 and reduces the risk of separation between the protective member and the conductive part 12. Optionally, the protective member can be a rubber pad, a silicone pad, or an adhesive tape, which helps to reduce the impact of its own weight on the electrochemical device 100.

[0168] like Figure 2 , Figure 6 and Figure 7 As shown, in one embodiment, there are two second regions 112, with a first region 111 located between the two second regions 112. The heating power of each of the two second regions 112 is less than that of the first region 111. When the heating device 10 operates within the electrochemical device 100, the first region 111 heats the middle position of the battery cell 31, while the two second regions 112 heat the two side edges of the battery cell 31. This facilitates uniform heating of all areas of the battery cell 31 and reduces the temperature difference between different areas of the battery cell 31. Optionally, the maximum heating temperature of the first region 111 is greater than the maximum heating temperature of the second region 112.

[0169] In one embodiment, the maximum heating temperature of the first region 111 is 120°C. By setting the maximum heating temperature of the first region 111, it is beneficial to reduce the risk of thermal failure of the battery cell 31 due to heating by the heating device 10, and improve the safety performance of the electrochemical device 100.

[0170] In one embodiment, along the fourth direction P, the heating power of different heating bodies 11 is different, which is beneficial for the heating device 10 to perform targeted heating of the battery cells 31 at different positions and reduce the temperature difference between different battery cells 31.

[0171] In one embodiment, in the stacked battery cell assembly 30, the heat dissipation rate of the battery cell 31 closer to the stack center is less than that of the battery cell 31 farther from the stack center. Along the fourth direction P, the heat dissipation power of the heat-generating body 11 farther from the stack center is greater than that of the heat-generating body 11 closer to the stack center, which is beneficial to make the heating rate of different battery cells 31 the same and reduce the temperature difference between different battery cells 31.

[0172] In one embodiment, along the fifth direction Q, the end of the battery cell 31 near the sixth wall 26 is flush with the end of the heating device 10 near the sixth wall 26, which facilitates the assembly of the heating device 10 and the battery cell assembly 30.

[0173] like Figure 5 , Figure 6 and Figure 11 As shown, in one embodiment, the heating device 10 further includes a first connection terminal 16 and a second connection terminal 17, which are configured to be electrically connected to a power source to provide electrical energy to the heating body 11.

[0174] In one embodiment, the electrochemical device 100 further includes a first circuit board 41, which is located within the housing 20 and connected to the fifth wall 25. The first circuit board 41 and the battery cell assembly 30 are arranged along the fifth direction Q and electrically connected to the battery cell 31 in the battery cell assembly 30 and the heating device 10. The fifth direction Q is perpendicular to the fourth direction P.

[0175] In one embodiment, the first circuit board 41 is configured to control the charging and discharging of the battery cell assembly 30. In another embodiment, the first circuit board 41 includes a Battery Management System (BMS) component, which includes multiple electronic components capable of performing functions such as data acquisition, control, protection, communication, power calculation, signal transmission, and power transmission of the battery cell 31.

[0176] In one embodiment, the first circuit board 41 includes a printed circuit board (PCB).

[0177] In one embodiment, the first circuit board 41 includes a flexible printed circuit board (FPC).

[0178] In one embodiment, the first circuit board 41 is configured to provide an electrical path to the heating device 10, so that the heating body 11 of the heating device 10 can generate heat to heat the battery cell 31.

[0179] In one embodiment, the first connection end 16 connects the heating body 11 and the first circuit board 41, and the second connection end 17 connects the heating body 11 and the first circuit board 41, so that the first circuit board 41 is electrically connected to the heating body 11, and the battery cell assembly 30 is controlled by the first circuit board 41, so that the battery cell assembly 30 provides power to the heating body 11.

[0180] In one embodiment, both the first connection end 16 and the second connection end 17 are electrically connected to an external power source, which provides electrical energy to the heating body 11. This helps to reduce the impact of the energy consumption of the heating device 10 on the electrochemical device 100.

[0181] In one embodiment, multiple heating bodies 11 are electrically connected in sequence through multiple conductive parts 12, with a first connection end 16 connected to the heating body 11 at the beginning and a second connection end 17 connected to the heating body 11 at the end.

[0182] In one embodiment, the first connection terminal 16 is a wire. In another embodiment, the first connection terminal 16 is a metal component with good electrical conductivity, such as copper.

[0183] In one embodiment, the second connection terminal 17 is a wire. In another embodiment, the second connection terminal 17 is a metal with good electrical conductivity, such as copper.

[0184] In one embodiment, the electrochemical device 100 further includes a third insulating member 50, and the cell assembly 30, the third insulating member 50, and the first circuit board 41 are arranged along the fifth direction Q. The third insulating member 50 can provide insulation, reducing the risk of a short circuit between the cell assembly 30 and the first circuit board 41.

[0185] like Figure 5 , Figure 12 and Figure 13 As shown, in one embodiment, the third insulating member 50 includes a bottom wall 51 and a plurality of side walls. The main body 3111 and the bottom wall 51 are arranged along the fifth direction Q. The side walls are connected to the bottom wall 51 and extend toward the main body 3111. The bottom wall 51 and the plurality of side walls form a receiving cavity 56. The opening of the receiving cavity 56 faces the main body 3111, and the portion of the electrode terminal 313 extending out of the top seal 31121 is located within the receiving cavity 56.

[0186] In one embodiment, a portion of the top seal 31121 is located within the receiving cavity 56, and the third insulating member 50 provides protection for the top seal 31121, reducing the risk of damage to the top seal 31121. In one embodiment, a portion of the first connecting end 16 is located within the receiving cavity 56 and extends partially to the side of the bottom wall 51 opposite to the main body 3111. In one embodiment, the third insulating member 50 provides protection for the first connecting end 16, reducing the risk of damage to the first connecting end 16. In one embodiment, a portion of the second connecting end 17 is located within the receiving cavity 56 and extends partially to the side of the bottom wall 51 opposite to the main body 3111. In one embodiment, the third insulating member 50 provides protection for the second connecting end 17, reducing the risk of damage to the second connecting end 17.

[0187] In one embodiment, the sidewalls include a first sidewall 52, a second sidewall 53, a third sidewall 54, and a fourth sidewall 55. The first sidewall 52 and the third sidewall 54 are arranged along a sixth direction W, and the fourth sidewall 55 and the second sidewall 53 are arranged along a fourth direction P. The first sidewall 52, the second sidewall 53, the third sidewall 54, and the fourth sidewall 55 are all connected to the bottom wall 51 and form a receiving cavity 56.

[0188] like Figures 10 to 13 As shown, in one embodiment, a first slot 521 is provided on the side of the first sidewall 52 facing away from the receiving cavity 56, and a portion of the first connecting end 16 is disposed in the first slot 521. The first slot 521 can fix and limit the first connecting end 16, which helps to reduce the risk of the first connecting end 16 shaking and being damaged.

[0189] In one embodiment, the first slot 521 extends along the fifth direction Q, which helps to improve its limiting effect on the first connecting end 16 and further reduces the risk of shaking damage to the first connecting end 16.

[0190] In one embodiment, a second slot 522 is provided on the side of the first sidewall 52 facing away from the receiving cavity 56, and a portion of the second connecting end 17 is disposed within the second slot 522. The second slot 522 can fix and limit the second connecting end 17, which helps to reduce the risk of the second connecting end 17 shaking and being damaged.

[0191] In one embodiment, the second slot 522 extends along the fifth direction Q, which helps to improve its limiting effect on the second connecting end 17 and further reduces the risk of shaking damage to the second connecting end 17.

[0192] In other embodiments, the second slot 522 is disposed on the second side wall 53, the third side wall 54, or the fourth side wall 55 (not shown).

[0193] like Figure 5 , Figure 11 , Figure 14 and Figure 15 As shown, in one embodiment, the heating device 10 further includes a control switch 18, which is connected to a first connection terminal 16 or a second connection terminal 17. The control switch 18 can control the circuit opening or closing of the heating device 10. Optionally, the control switch 18 is connected to the second connection terminal 17, and the circuit opening or closing of the heating device 10 is controlled by controlling the circuit opening or closing of the second connection terminal 17.

[0194] In one embodiment, a control switch 18 is connected to the electrode terminal 313. The control switch 18 is configured to detect the temperature of the electrode terminal 313 and disconnect the heating device 10 when the temperature exceeds a preset temperature, thereby reducing the risk of thermal failure of the battery cell 31. In one embodiment, the preset temperature is 80°C.

[0195] In one embodiment, the control switch 18 is located in the region of the electrode terminal 313 near the top seal 31121, which helps to improve the accuracy of the control switch 18 in detecting the temperature of the electrode terminal 313 and reduce the risk of thermal failure of the cell 31.

[0196] In one embodiment, along the fourth direction P, the control switch 18 is disposed on the top seal 31121 of the outermost cell 31, which helps to reduce the risk of thermal failure of the cell 31.

[0197] like Figure 6 , Figure 10 and Figure 12 As shown, in one embodiment, the electrochemical device 100 further includes a total positive connection 61 and a total negative connection 62. The total positive connection 61 connects the cell assembly 30 and the first circuit board 41, and the total negative connection 62 connects the cell assembly 30 and the first circuit board 41, so that the first circuit board 41 can electrically connect all the cells 31 to control the charging and discharging of the cells 31.

[0198] In one embodiment, a portion of the main positive connection 61 is located within the receiving cavity 56 and extends partially to the side of the bottom wall 51 opposite to the main body 3111. In one embodiment, the third insulating member 50 can protect the main positive connection 61 and reduce the risk of damage to the main positive connection 61.

[0199] In one embodiment, a portion of the main negative connection 62 is located within the receiving cavity 56 and extends partially to the bottom wall 51 on the side opposite to the main body 3111. In another embodiment, the third insulating member 50 can protect the main negative connection 62 and reduce the risk of damage to the main negative connection 62.

[0200] In one embodiment, the bottom wall 51 is provided with a first through hole 511, and a portion of the main positive connection portion 61 passes through the first through hole 511.

[0201] In one embodiment, the electrochemical device 100 further includes a first filler, at least a portion of which is located within the first through-hole 511 and connected to the main positive connection portion 61. The first filler serves to fill and fix the connection, improving the connection stability between the main positive connection portion 61 and the first through-hole 511 and reducing the risk of relative movement of the main positive connection portion 61 relative to the third insulating member 50.

[0202] In one embodiment, the first filler includes, but is not limited to, sealant, foam, and foam.

[0203] In one embodiment, the bottom wall 51 is provided with a second through hole 512, and a portion of the total negative connection portion 62 passes through the second through hole 512.

[0204] In one embodiment, the electrochemical device 100 further includes a second filler, at least a portion of which is located within the second through-hole 512 and connected to the main negative connection portion 62. The second filler serves to fill and fix the connection, improving the connection stability between the main negative connection portion 62 and the second through-hole 512 and reducing the risk of relative movement of the main negative connection portion 62 relative to the third insulating member 50.

[0205] In one embodiment, the second filler includes, but is not limited to, sealant, foam, and foam.

[0206] like Figure 5 As shown, in one embodiment, the electrochemical device 100 further includes a second circuit board 42, which is disposed within the receiving cavity 56 and electrically connected to the electrode terminal 313. The second circuit board 42 can acquire electrical signal information of the battery cell 31 through the electrode terminal 313. For example, the electrical signal information includes, but is not limited to, voltage, current, and temperature.

[0207] In one embodiment, the second circuit board 42 is electrically connected to all electrode terminals 313 to obtain electrical signal information of all cells 31 in the cell assembly 30 through all electrode terminals 313.

[0208] In one embodiment, the second circuit board 42 is electrically connected to the first circuit board 41, and the first circuit board 41 obtains the electrical signal information of the battery cell 31 through the second circuit board 42.

[0209] In one embodiment, the second circuit board 42 includes a printed circuit board (PCB).

[0210] In one embodiment, the second circuit board 42 includes a flexible printed circuit board (FPC).

[0211] like Figure 6 , Figure 10 and Figure 12As shown, the electrochemical device 100 also includes a wiring harness 70. A portion of the wiring harness 70 is located within the receiving cavity 56 and connected to the second circuit board 42. Another portion of the wiring harness 70 extends to the bottom wall 51 on the side opposite to the main body 3111 and connects to the first circuit board 41, thus electrically connecting the first circuit board 41 and the second circuit board 42 to transmit electrical signals, enabling the first circuit board 41 to obtain electrical signal information from the battery cell 31 from the second circuit board 42. In one embodiment, a third insulating member 50 can protect the wiring harness 70, reducing the risk of damage to the wiring harness 70.

[0212] In one embodiment, the bottom wall 51 is provided with a third through hole 513, through which a portion of the wire harness 70 passes.

[0213] In one embodiment, the electrochemical device 100 further includes a third filler, at least a portion of which is located within the third through-hole 513 and connected to the wiring harness 70. The third filler serves to fill and fix the wiring harness 70, improving the connection stability between the wiring harness 70 and the third through-hole 513 and reducing the risk of poor contact between the wiring harness 70 and the first circuit board 41 or the second circuit board 42 due to relative movement of the wiring harness 70 relative to the third insulating member 50.

[0214] In one embodiment, the third filler includes, but is not limited to, sealant, foam, and foam.

[0215] like Figure 6 , Figure 16 and Figure 17 As shown, in one embodiment, the first wall 21 and the first side wall 52 are arranged along the sixth direction W, the second side wall 53 and the second wall 22 are arranged along the fourth direction P, the third side wall 54 and the third wall 23 are arranged along the sixth direction W, and the fourth wall 24 and the fourth side wall 55 are arranged along the fourth direction P.

[0216] In one embodiment, the first wall 21 is provided with a first groove 211, at least a portion of the first slot 521 is located within the first groove 211, and a portion of the first connecting end 16 is located within the first groove 211 and extends out of the first groove 211. The first groove 211 can serve as a clearance mechanism, reducing the risk of interference between the first wall 21 and the first slot 521, and improving the space utilization of the electrochemical device 100.

[0217] In one embodiment, the first wall 21 is provided with a second groove 212, at least a portion of the second slot 522 is located within the second groove 212, and a portion of the second connecting end 17 is located within the second groove 212 and extends out of the second groove 212. The second groove 212 can serve as a clearance mechanism, reducing the risk of interference between the first wall 21 and the second slot 522, and improving the space utilization of the electrochemical device 100.

[0218] In summary, in the electrochemical device 100 of this application, the heating device 10 is arranged with multiple heating bodies 11 spaced apart along the first direction X, forming gaps 14, which facilitates the bending and deformation of the heating device 10 in the gap 14 region between adjacent heating bodies 11. Furthermore, the conductive part 12 connecting two adjacent heating bodies 11 is separated from the gap 14, which further facilitates the bending and deformation of the heating device 10 and improves the assembly efficiency of the electrochemical device 100.

[0219] like Figure 18 As shown, embodiments of this application also provide an electrical device 200, including the electrochemical device 100 in any of the foregoing embodiments.

[0220] In the aforementioned electrical equipment 200, the heating device 10 in the electrochemical device 100 is arranged with multiple heating bodies 11 spaced apart along the first direction X, forming gaps 14. This facilitates the bending and deformation of the heating device 10 in the gap 14 region between adjacent heating bodies 11. Furthermore, the conductive part 12 connecting two adjacent heating bodies 11 is separated from the gap 14, which further facilitates the bending and deformation of the heating device 10, improves the assembly efficiency of the electrochemical device 100, saves the manufacturing cost of the electrochemical device 100, and reduces the impact of the cost of the electrochemical device 100 on the electrical equipment 200.

[0221] In one embodiment, the electrochemical device 100 is capable of providing electrical energy to the electrical device 200.

[0222] In one embodiment, the electrical equipment 200 includes, but is not limited to, any one of a drone, an electric two-wheeler, a power tool, and a robot.

[0223] In addition, those skilled in the art may make other changes within the spirit of this application. Of course, all such changes made in accordance with the spirit of this application should be included within the scope disclosed in this application.

Claims

1. An electrochemical device, characterized in that, It includes a battery cell assembly and a heating device connected to the battery cell assembly; the heating device includes: At least two heating elements are arranged at intervals along a first direction, with a gap between adjacent heating elements; At least one conductive part is provided, and two adjacent heating bodies are connected through the conductive part, with the conductive part and the gap being separate. An insulating element is provided, covering at least a portion of the surface of the heating body; The battery cell assembly includes multiple battery cells, each battery cell including a housing, an electrode assembly and an electrode terminal, a portion of the electrode terminal being located inside the housing and connected to the electrode assembly, and a portion of the electrode terminal extending out of the housing, the housing including a main body portion, and the electrode assembly being housed within the main body portion; The heating element is connected to the main body, and the conductive part is separate from the main body; The conductive part is bent relative to the heating body; The battery cell also includes a sealing portion extending from the main body portion, and the electrode terminals extend from the sealing portion out of the main body portion; Multiple battery cells are stacked together, and along the stacking direction of the battery cells, at least one portion of the heating body is located between adjacent body portions, and at least one portion of the conductive portion is located between adjacent sealing portions.

2. The electrochemical device as described in claim 1, characterized in that, The heating device further includes at least one insulating connection portion, which is located between two adjacent heating bodies and connects the two adjacent heating bodies.

3. The electrochemical device as described in claim 2, characterized in that, The insulating connection portion is disposed on the insulating member.

4. The electrochemical device as described in claim 2, characterized in that, The insulating connection and the insulating component are integrally formed.

5. The electrochemical device according to any one of claims 1 to 4, characterized in that, The insulating component includes: The first insulating element covers the entire surface of the heating body; The second insulating element covers the entire surface of the conductive portion.

6. The electrochemical device as claimed in claim 1, characterized in that, The heating device also includes: The first connection terminal is electrically connected to the heating body; The second connection terminal is electrically connected to the heating body; A control switch is connected to either the first connection terminal or the second connection terminal, and the control switch is configured to detect the temperature of the electrode terminals; Along the stacking direction of the battery cells, the control switch is connected to the electrode terminal located on the outermost battery cell.

7. The electrochemical device as claimed in claim 1, characterized in that, The electrochemical device further includes a third insulating element, which includes a bottom wall and a plurality of side walls connected to the bottom wall. The bottom wall and the plurality of side walls form a receiving cavity, the opening of which faces the main body. The portion of the electrode terminal extending out of the sealing portion is located within the receiving cavity. The sidewall opposite to the receiving cavity is provided with a first slot; The heating device further includes a first connecting end connected to the heating body. The first connecting end is located in the first slot and extends to the bottom wall on the side opposite to the main body.

8. The electrochemical device as described in claim 7, characterized in that, The electrochemical device further includes a first circuit board, the first connection terminal being connected to the first circuit board, and the first circuit board being configured to provide an electrical path to the heating device.

9. The electrochemical device as claimed in claim 7, characterized in that, The electrochemical device further includes a second circuit board, which is disposed within the receiving cavity and connected to the electrode terminals; The second circuit board is configured to acquire electrical signal information of the battery cell.

10. An electrical appliance, characterized in that, Includes the electrochemical device as described in any one of claims 1 to 9.

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