CN217823169U - Battery connecting element, wiring harness isolation board assembly, battery module and electric device - Google Patents

Abstract

The application discloses battery connecting element (1), characterized in that battery connecting element (1) includes: a battery connection tab (2); an insulating material layer (3) arranged on the battery connecting sheet (2); and a layer (4) of heat-sensitive material arranged on the layer (3) of insulating material, said layer of heat-sensitive material being intended for temperature sampling. Furthermore, the application discloses a pencil division board subassembly (8), a battery module, a battery and a power consumption device for battery module. In order to overcome the problems of errors and hysteresis existing in the existing temperature sampling scheme in a battery or a battery module, the application provides that a layered insulating material and a layered thermosensitive material for temperature sampling are sequentially arranged on a battery connecting piece, so that the accuracy and the response speed of temperature acquisition are ensured.

Description

Battery connecting element, wiring harness isolation board assembly, battery module and electric device

Technical Field

The application relates to the technical field of batteries, in particular to a battery connecting element, a wiring harness isolation board assembly, a battery module, a battery and an electric device.

Background

Energy conservation and emission reduction are the key points of sustainable development of the automobile industry, and the electric vehicle becomes an important component of the sustainable development of the automobile industry due to the advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in its development.

In the current battery technology, the existing temperature sampling scheme in the battery or the battery module generally has the problem that the temperature sampling data has errors and hysteresis, so that the battery or the battery module cannot take safety measures based on accurate temperature or only takes safety measures such as power limitation, alarm and the like in a lagging way.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, the utility model provides a battery connecting element, pencil division board subassembly, battery module, battery and power consumption device to this accuracy and the response speed that improves the temperature sampling.

According to a first aspect of the present application, there is provided a battery connecting element comprising: a battery connecting sheet; an insulating material layer disposed on the battery tab; and a heat sensitive material layer disposed on the insulating material layer, the heat sensitive material layer being for temperature sampling.

In the technical scheme of the embodiment of the application, a layered insulating material and a layered thermosensitive material for temperature sampling are sequentially arranged on a battery connecting piece. This design makes it possible, on the one hand, to sample the temperature using the heat-sensitive material layer as close as possible to the battery tab, so that a more accurate detection of the actual temperature of the battery tab is possible. Moreover, since only the insulating material layer for electrical insulation is spaced between the battery tab and the heat-sensitive material layer, no or only a negligible temperature gradient exists from the battery tab to the heat-sensitive material layer, which enables the temperature detected by the heat-sensitive material layer to be reflected numerically with almost no error exactly on the actual temperature of the battery tab. On the other hand, the temperature sampling structure including the insulating material layer and the thermosensitive material layer has only a small mass due to the layered arrangement structure, so that the thermal capacity of the temperature sampling structure as a whole is low, which enables the entire temperature sampling structure to achieve thermal equilibrium with the battery connection tab with only a small amount of heat absorbed or released when a temperature change occurs in the battery connection tab, so that the temperature of the thermosensitive material layer can change with the battery connection tab with almost no delay, and the temperature collected by the thermosensitive material layer can quickly respond to the temperature change of the battery connection tab.

In addition, the battery connecting element according to the embodiment of the present application advantageously provides an integrated structure of the battery connecting piece and the temperature sampling structure, that is, the insulating material layer and the heat sensitive material layer are directly arranged on the battery connecting piece, so that the temperature collecting structure is formed on the battery connecting piece, thereby simplifying the subsequent assembly process of the battery or the battery module, and omitting a device for temperature sampling, such as a heat sensitive device, from being adhered or welded to the predetermined battery connecting piece in a time-consuming manner. In addition, the cell connection tab, which serves as a basic component of the cell or cell module, on which the temperature sampling structure is directly integrated, can facilitate modular or flexible production of the cell or cell module.

In the context of the present application, the battery connecting tab, also referred to as a bus bar, is used to electrically connect the terminals of at least one cell, and may be used to implement series connection, parallel connection, or series-parallel connection of cells in a battery module.

Within the scope of the present application, the insulating-material layer and the heat-sensitive material layer are to be understood as planar structures made of insulating material and heat-sensitive material, respectively, whose geometrical dimensions in the length and width directions are much greater than those in the thickness direction. In other words, the insulating material layer and the heat-sensitive material layer can be regarded as a layer or even a film made of insulating material and heat-sensitive material, respectively, wherein the layer or film made of insulating material is arranged or applied flat on the planar surface of the cell connecting plate, and the layer or film made of heat-sensitive material is arranged or applied flat on the surface of the insulating material layer. Thereby forming a laminated structure composed of a battery connecting sheet, an insulating material layer, and a heat-sensitive material layer.

Within the scope of the present application, insulating material refers to an electrically insulating material. The layer of insulating material prevents current from passing from the current tab to the layer of heat sensitive material at least at the operating voltage of the battery. A thermosensitive material refers to a material whose resistance value changes with a change in temperature. The layer of thermally sensitive material may relate to a thermal resistance layer, a thermocouple layer or a thermal resistance layer, in particular a positive temperature coefficient thermistor (PTC) layer or a negative temperature coefficient thermistor (NTC) layer.

In some embodiments, the layer of insulating material is tightly attached to the battery connection tabs. In this way, it is ensured that the insulating material layer is reliably bonded to the battery connecting plate, so that the insulating material layer is firmly held on the battery connecting plate during operation of the battery or battery module and is not easily loosened or peeled off.

In some embodiments, the layer of thermally sensitive material is intimately attached to the layer of insulating material. This ensures that the heat-sensitive material layer is reliably attached to the insulating material layer, so that the insulating material layer is held firmly against the insulating material layer during operation of the battery or battery module and is not easily loosened or peeled off. Thereby, a temperature sampling structure comprising an insulating material layer and a heat sensitive material layer is reliably connected to the battery tab. This in particular increases the reliability of the temperature sampling compared to the adhesive, adhesive or overlapping connection of heat-sensitive components, which is common in the prior art.

In some embodiments, the layer of insulating material is disposed on the battery tab by thermal spraying, physical vapor deposition, or chemical vapor deposition; and/or the heat sensitive material layer is disposed on the insulating material layer by electroplating, thermal spraying, physical vapor deposition, or chemical vapor deposition. In the present application, the layer of insulating material and/or the layer of heat sensitive material may be provided by a variety of means. The appropriate application process may be selected according to the specific materials and/or specific process requirements of the insulating material layer and the heat sensitive material layer. Here, the thermal spraying means that a material is heated to be melted, atomized into particles with a high-speed gas flow, and sprayed onto the surface of a battery tab or an insulating material layer. Physical Vapor Deposition (PVD) refers to physical vaporization of materials into gaseous atoms or molecules or ionization into ions under vacuum conditions and deposition of the same by low pressure gas onto a battery tab or insulating material layer. Chemical Vapor Deposition (CVD) refers to a process in which a chemical substance in a gaseous or vapor state is reacted by heat, plasma excitation, or light irradiation, etc., and deposited in an atomic state at a suitable position, thereby forming a desired solid layer. In addition, the heat-sensitive material layer can be applied on the insulating material layer in an electroplating mode.

In some embodiments, the thickness of the layer of insulating material and the layer of thermally sensitive material is on the order of micrometers or nanometers. In this case, the temperature sampling structure on the cell tab is realized as thinly as possible by specifying the insulating material layer and the heat-sensitive material layer below the millimeter level, i.e. on the micrometer level or even on the nanometer level, so that the accuracy of the temperature sampling performed by the heat-sensitive material layer can be advantageously ensured, the occurrence of temperature gradients can be avoided as far as possible, and the temperature sampling can be dynamically responded to the temperature change of the cell tab very quickly.

In some embodiments, the thickness of the insulating material layer and the thickness of the heat sensitive material layer are each below 500 microns. Therefore, the whole temperature sampling structure has extremely small thermal resistance, so that extremely low temperature sampling error and high temperature sampling response speed are ensured.

In some embodiments, the layer of insulating material is made of a ceramic material, which is magnesium oxide, aluminum oxide or zirconium oxide. Since ceramic materials mostly have good electrical insulation and chemical stability, they are particularly suitable as insulating materials in the battery connecting element in the present application. In particular, the ceramic material can also be advantageously applied to the cell connection tab by thermal spraying, physical vapor deposition or chemical vapor deposition.

In some embodiments, the layer of thermally sensitive material is configured as a layer of a thermoresistor or thermocouple. In the present case, the thermal resistors or thermocouples are usually made of pure metals and/or alloys and can therefore be applied more simply to the insulating material layer than thermistors which are usually composed of sintered semiconductor materials, such as NTCs or PTCs. Thus, it is particularly preferable in some embodiments of the present application to use a thermal resistor or a thermocouple as the heat sensitive material, so that the manufacture of the battery connecting element can be simplified. Here, the thermocouple measures the temperature by connecting two conductors of different compositions to each other in a loop and by detecting the generation of a thermoelectromotive force in the loop, and the thermal resistance measures the temperature based on the increase of the resistance value of the metal conductor with the increase of the temperature.

In some embodiments, the thermal resistance layer is a Pt100 platinum thermal resistance layer or a Pt1000 platinum thermal resistance layer; and/or the thermocouple layer is a nickel-chromium-nickel-silicon thermocouple layer, a copper-nickel thermocouple layer or an iron-copper-nickel thermocouple layer. Here, since the platinum thermistor is accurate in measurement, good in stability, and reliable in performance, it is preferable to use a Pt100 platinum thermistor layer or a Pt1000 platinum thermistor layer for the thermosensitive material layer. For such a thermal resistance layer, wiring using a two-wire system, a three-wire system, or a four-wire system is conceivable. Further, it is also conceivable to form the thermosensitive material layer using a couple pair composed of nichrome-nickel silicon, copper-copper nickel, or iron-copper nickel, thereby manufacturing the thermosensitive material layer at a relatively low cost.

In some embodiments, the insulating material layer has an area greater than an area of the heat sensitive material layer. By such a design it can be ensured that the heat-sensitive material layer does not contact the battery tab, advantageously protecting the heat-sensitive material layer.

According to a second aspect of the present application, there is provided a wire harness separator assembly for a battery module, the wire harness separator assembly comprising: at least one battery connecting element according to some embodiments of the present application and a temperature sampling wire for connection to a sampling circuit, the temperature sampling wire being electrically connected to the heat sensitive material layer of the battery connecting element.

According to the technical scheme of the embodiment of the application, the battery connecting element according to some embodiments of the application is favorably used in the wiring harness isolation plate assembly, so that on one hand, the accuracy and the response speed of temperature sampling can be improved, on the other hand, a thermosensitive device can be omitted from being integrated on a sampling circuit, the process flow of jointing the thermosensitive device on a battery connecting sheet is omitted, the automatic production is favorably realized, and the production beat is improved.

In some embodiments, the temperature sampling wire is connected to the heat sensitive material layer and the sampling circuit by a bonding process or ultrasonic welding. A bonding process, i.e. a wire bonding process, may advantageously be used in this application to contact the layer of thermally sensitive material with the sampling circuit. The temperature sampling lead can be tightly welded with the to-be-connected area on the thermosensitive material layer and the sampling circuit by using heat, pressure and ultrasonic energy in the bonding process, so that the bonding on the atomic scale can be realized. The temperature information sampled by the thermosensitive material layer is transmitted to the sampling circuit through the temperature sampling wire bonded in this way. Alternatively, cold joining processes such as ultrasonic welding are also contemplated herein.

In some embodiments, the temperature sampling wire is configured as a bond wire. The bonding wires are used for realizing the connection between the thermosensitive material layer and the sampling circuit, so that the reliability of electrical connection and electric signal transmission can be ensured.

In some embodiments, the bonding wire is made of aluminum, copper, or silver. Here, the appropriate bonding wire material may be selected according to the specific material of the thermosensitive material layer, process requirements, and/or environmental requirements, etc.

In some embodiments, the bonding wire is bonded to the sampling circuit by means of a nickel plate. The nickel sheet can be used as a bonding pad on the sampling circuit, so that the bonding pad is prevented from falling off or bonding failure caused by the fact that the bonding pad needs to bear shearing force in the bonding process, the sampling circuit is favorably protected, and the bonding reliability is ensured.

In some embodiments, an epoxy is applied to at least the heat sensitive material layer of the battery connecting element. Since moisture may occur in the interior of the battery or the battery module, in order to prevent the heat sensitive material layer from being short-circuited, it is advantageous to apply epoxy resin at least on the heat sensitive material layer to insulate the influence of moisture. In particular, an epoxy may be applied over the entire temperature sampling structure, including the insulating material layer and the heat sensitive material layer, to provide protection of the temperature sampling structure against moisture, vibration, peeling, and the like. It is particularly preferable to apply epoxy resin on the thermosensitive material layer with the temperature sampling wire connected, thereby further protecting the connection portion on the thermosensitive material layer.

In some embodiments, the epoxy is applied by a dispensing process. Through using the gluey technology of gluing can further improve the degree of automation that is used for the pencil division board subassembly production of battery module, improve the beat of production.

According to a third aspect of the present application, there is provided a battery module characterized in that the battery module includes at least one battery connection member according to some embodiments of the present application and/or a wire harness insulation board assembly according to the present application.

According to a fourth aspect of the present application, there is provided a battery including the battery module according to some embodiments of the present application.

According to a fifth aspect of the present application, there is provided an electric device, wherein the electric device comprises a battery according to some embodiments of the present application, and the battery is configured to provide electric energy to the electric device.

The above description is only an overview of the technical solutions of the present application, and the present application may be implemented in accordance with the content of the description so as to make the technical means of the present application more clearly understood, and the detailed description of the present application will be given below in order to make the above and other objects, features, and advantages of the present application more clearly understood.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic structural view of some embodiments of the present application for mounting a battery to a vehicle.

Fig. 2 is an exploded view of some embodiments of the batteries of the present application.

Fig. 3 is a side view of a battery connecting element according to some embodiments of the present application.

Fig. 4 is an exploded side view of a battery connecting element provided in accordance with some embodiments of the present application.

Fig. 5 is a top view of a battery connecting element according to some embodiments of the present application.

Fig. 6 illustrates a schematic structural view of a wiring harness insulation board assembly provided for some embodiments of the present application.

Fig. 7 is a schematic diagram of a connection between a battery connection element and a sampling circuit according to some embodiments of the present disclosure.

Fig. 8 is a schematic exploded view of a connection of a battery connection element to a sampling circuit provided in some embodiments of the present application.

The reference numerals in the detailed description are as follows:

a vehicle 1000;

a battery module 100, a controller 200, a motor 300;

a box 10, a first part 11, a second part 12; a battery cell 20;

a battery connecting assembly 1; a battery connection plate 2; an insulating material layer 3; a thermosensitive material layer 4;

a temperature sampling wire 5; a sampling circuit 6; a pad 7;

a harness insulation board assembly 8; a harness isolation plate 9;

a recess 13; viewing aperture 14

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present application more clearly, and therefore are only used as examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, 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 is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing the association object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural pieces" refers to two or more (including two).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

At present, the application of power batteries is more and more extensive from the development of market conditions. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and a plurality of fields such as military equipment and aerospace. With the continuous expansion of the application field of the power battery, the market demand is also continuously expanding. The battery referred to in the embodiments of the present application refers to a single physical module including a plurality of cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, etc.

In the research of the inventor of the present application, it was found that in the prior art, in order to collect the temperature in the battery or the battery module, a thermally conductive paste or a thermally conductive pad is generally used to insulate the thermosensitive device from the battery connection sheet conducting the current. However, the thermally conductive paste or pad implemented at the physical level inevitably causes a significant gap between the thermosensitive device and the battery tab, so that the thermosensitive device cannot sense the actual temperature of the battery tab, and a certain temperature gradient may also occur in such thermally conductive paste or pad, so that the temperature measured by the thermosensitive device is always different from the actual temperature of the battery tab. And the heat absorption or release of the heat conducting glue or pad during the heat transfer to the thermosensitive device also makes the sensed temperature data of the thermosensitive device lag behind the temperature change of the battery connecting plate. In particular, thermosensitive devices are also protected in some prior art by armoring, in particular multilayer armoring, which further deteriorates the accuracy and response speed of temperature acquisition.

Based on the above findings, the inventors of the present application have made improvements to the temperature sampling scheme in the battery or the battery module. In the application, by sequentially arranging the layered insulating material and the layered thermosensitive material for temperature sampling on the battery connecting sheet, the temperature sampling implemented by using the thermosensitive material layer can be performed as close to the battery connecting sheet as possible by the design, so that the actual temperature of the battery connecting sheet can be more accurately acquired. Moreover, since only the insulating material layer for electrical insulation is spaced between the battery tab and the heat-sensitive material layer, no or only a negligible temperature gradient exists from the battery tab to the heat-sensitive material layer, which enables the temperature detected by the heat-sensitive material layer to be reflected numerically with almost no error exactly on the actual temperature of the battery tab. On the other hand, the temperature sampling structure including the insulating material layer and the thermosensitive material layer has only a small mass due to the layered arrangement structure, so that the thermal capacity of the temperature sampling structure as a whole is low, which enables the entire temperature sampling structure to achieve thermal equilibrium with the battery connection tab with only a small amount of heat absorbed or released when the temperature of the battery connection tab changes, so that the temperature of the thermosensitive material layer can change with the battery connection tab with almost no delay, and the temperature collected by the thermosensitive material layer can quickly respond to the temperature change of the battery connection tab.

In addition, the battery connecting element according to the embodiment of the present application advantageously provides an integrated structure of the battery connecting tab and the temperature sampling structure, that is, the temperature sampling structure including the insulating material layer and the heat sensitive material layer is directly provided on the battery connecting tab, thereby simplifying the subsequent assembly process of the battery or the battery module and omitting the time-consuming bonding or welding of the device for temperature sampling to the predetermined battery connecting tab. In addition, the cell tabs serve as basic components of the battery or battery module, on which the temperature sampling structure is directly integrated, which may facilitate the modular or flexible production of the battery or battery module.

The battery connecting element disclosed in the embodiments of the present application may be, but is not limited to, used for a battery module or a harness insulation board assembly thereof. Can use and possess the battery connecting element that this application is disclosed to constitute battery module or its pencil division board subassembly, make can pass through battery connecting element improves the accuracy and the response speed of temperature sampling and saves process flow, is favorable to realizing automated production, improves the beat of production.

The wire harness insulation board assembly disclosed by the embodiment of the application can be used for a battery module or a battery, but is not limited to the battery module or the battery. Can use and possess the pencil division board subassembly that this application is disclosed to constitute battery module or battery, make can make with the help the pencil division board subassembly improves the accuracy and the response speed to the temperature sampling of battery module and even battery to be favorable to accurately and detect the temperature condition of battery module or battery in real time, be favorable to in time taking safety measure as required, guarantee the safe operation of battery module or battery. Meanwhile, the process flow can be saved by means of the wiring harness isolation plate assembly, automatic production is facilitated, and the production takt is improved.

The battery and/or the battery module disclosed by the embodiment of the application can be used in electric devices such as vehicles, ships or aircrafts, but not limited to the electric devices. The power supply system with the electric device formed by the battery and/or the battery module and the like disclosed by the application can be used, so that the temperature condition of the battery and/or the battery module can be detected accurately and in real time, safety measures can be taken timely and as required, and the safe operation of the battery and/or the battery module is ensured.

The embodiment of the application provides an electric device using a battery and/or a battery module as a power supply, wherein the electric device can be but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc. The electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and electric tools for railways, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators, and electric planers.

For convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electric device according to an embodiment of the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or an extended range automobile, etc. The battery module 100 is provided inside the vehicle 1000, and the battery module 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery module 100 may be used for power supply of the vehicle 1000, and for example, the battery module 100 may serve as an operation power source of the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, wherein the controller 200 is used for controlling the battery module 100 to supply power to the motor 300, for example, for starting, navigating and driving of the vehicle 1000.

In some embodiments of the present application, the battery module 100 may be used not only as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, instead of or in part of fuel or natural gas to provide driving power for the vehicle 1000.

Referring to fig. 2, fig. 2 is an exploded view of a battery module 100 according to some embodiments of the present disclosure. The battery module 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The box 10 is configured to provide a receiving space for the battery cell 20, and the box 10 may adopt various structures. In some embodiments, the case 10 may include a first portion 11 and a second portion 12, where the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 jointly define a receiving space for receiving the battery cell 20. The second part 12 may be a hollow structure with one open end, the first part 11 may be a plate-shaped structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a containing space; the first portion 11 and the second portion 12 may be both hollow structures with one side open, and the open side of the first portion 11 may cover the open side of the second portion 12. Of course, the box 10 formed by the first and second portions 11 and 12 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery module 100, the battery cells 20 may be multiple, and the multiple battery cells 20 may be connected in series, in parallel, or in series-parallel through a wiring harness isolation board assembly described in further detail below, where in series-parallel connection refers to both series connection and parallel connection among the multiple battery cells 20. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and the whole body formed by the plurality of battery cells 20 is accommodated in the box body 10; of course, the battery module 100 may also be a battery module formed by connecting a plurality of battery cells 20 in series, in parallel, or in series-parallel, and then a plurality of battery modules are connected in series, in parallel, or in series-parallel to form a whole, and are accommodated in the box 10. The Battery module 100 may further include other structures, for example, the Battery module 100 may further include a Battery monitoring unit (CSC) and/or a Battery Management System (BMS) for performing state monitoring.

Each battery cell 20 may be a secondary battery or a primary battery; but is not limited to, a lithium ion battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery. The battery cell 20 may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, but is not limited thereto. The cells 20 can be generally divided into three types in an encapsulated manner: cylindrical cells, square cells, and soft-packed cells, but are not limited thereto.

Referring to fig. 3, fig. 3 is a side view of the battery connecting element 1 according to some embodiments of the present disclosure. Referring to fig. 3, and with further reference to fig. 4-5, according to some embodiments of the present application, fig. 4 illustrates an exploded side view of a battery connecting element 1 of some embodiments of the present application, and fig. 5 illustrates a top view of the battery connecting element 1 of some embodiments of the present application.

The present application provides a battery connecting element 1, comprising: a battery connecting sheet 2; an insulating material layer 3 provided on the battery tab 2; and a thermosensitive material layer 4 arranged on the insulating material layer 3, wherein the thermosensitive material layer 4 is used for temperature sampling.

The battery connecting tabs 2, which may also be referred to as bus bars, are used to electrically connect the poles of at least one battery cell 20 and may be used to realize series connection or parallel connection or series-parallel connection of the battery cells 20 in the battery module 100.

The insulating-material layer 3 and the heat-sensitive material layer 4 are to be understood as planar structures made of insulating material and heat-sensitive material, respectively, whose geometrical dimensions in the length and width directions are much greater than those in the thickness direction. In other words, the insulating-material layer 3 and the heat-sensitive material layer 4 can be considered as a layer or even a film made of insulating material and heat-sensitive material, respectively, wherein the layer or film made of insulating material is arranged or applied flat on the flat surface of the cell connecting plate 2, and the layer or film made of heat-sensitive material is arranged or applied flat on the surface of the insulating-material layer 3. A laminated structure consisting of the battery tab 2, the insulating material layer 3, and the heat-sensitive material layer 4 is thus formed.

Herein, the insulating material refers to an electrically insulating material. The insulating material layer prevents current from passing from the current lug 2 to the heat sensitive material layer 4 at least at the operating voltage of the battery.

Here, the thermosensitive material refers to a material whose resistance value changes with a change in temperature. The thermosensitive material layer may relate to a thermistor layer, a thermocouple layer or a thermistor layer, in particular a positive temperature coefficient thermistor (PTC) layer or a negative temperature coefficient thermistor (NTC) layer.

In fig. 3, a side view of the battery connecting element 1 from the side is shown, from which the connection relationship of the three parts included in the battery connecting element 1 can be clearly seen: an insulating material layer 3 is arranged directly on the battery lug 2, and a heat-sensitive material layer 4 for temperature sampling is arranged directly on the insulating material layer 3. In the battery connecting element 1, the insulating material layer 3 is spaced between the battery tab 2 and the heat-sensitive material layer 4 in the stacking order of the battery tab 2, the insulating material layer 3 and the heat-sensitive material layer 4, so that the battery tab 2 and the heat-sensitive material layer 4 are insulated from each other.

It can also be clearly seen from fig. 3 that, due to the layered arrangement of the insulating material and the heat-sensitive material, the temperature sampling carried out with the heat-sensitive material layer 4 can be carried out as close as possible to the cell tab 2, so that a more accurate detection of the actual temperature of the cell tab 2 can be achieved.

Moreover, since only the insulating material layer 3 for electrical insulation is spaced between the battery tab 2 and the heat-sensitive material layer 4, no or only a negligible temperature gradient exists from the battery tab 2 to the heat-sensitive material layer 4, which enables the temperature detected by the heat-sensitive material layer 4 to be a numerically almost error-free accurate reflection of the actual temperature of the battery tab 2.

Furthermore, based on the layered arrangement structure described above, the temperature sampling structure including the insulating material layer 3 and the thermosensitive material layer 4 has only a small mass due to the layered arrangement structure, so that the thermal capacity of the temperature sampling structure as a whole is low, which enables the entire temperature sampling structure to achieve thermal equilibrium with the battery tab 2 with only a small amount of heat absorbed or released when a temperature change occurs in the battery tab 2, so that the temperature of the thermosensitive material layer 4 can change with the battery tab 2 with almost no delay, so that the temperature collected by the thermosensitive material layer 4 can respond quickly to the temperature change in the battery tab 2.

Fig. 4 is an exploded side view of a battery connecting element 1 according to some embodiments of the present application. The stacking order of the battery tab 2, the insulating-material layer 3 and the heat-sensitive material layer 4 is further clearly shown.

Fig. 5 is a top view of a battery connecting element 1 according to some embodiments of the present application. The layout of the insulating-material layer 3 and the heat-sensitive material layer 4 on the battery tab 2 can be seen in fig. 5.

The battery tab 2 in fig. 5 has a recess 13 which is thinned to connect the tabs of the battery cells 20, and a viewing opening 14 is provided in this recess 13.

The insulating-material layer 3 and the heat-sensitive material layer 4 are arranged on the side of the battery terminal lug 2 facing away from the battery cell 20 and in a flat region outside the upset recess 13. Without being limited to the example in fig. 5, the insulating material layer 3 and the heat-sensitive material layer 4 may be provided at other positions on the battery tab 2 as needed, such as at positions further up or down in fig. 5 from the longitudinal center line of the battery tab 2. However, since the left side in fig. 5 is closer to the sampling circuit to be explained below, it is advantageous to arrange the insulating material layer 3 and the heat sensitive material layer 4 close to the sampling circuit, i.e. in the flat area of the left side in fig. 5, so that the connection of the heat sensitive material layer 4 to the sampling circuit can be facilitated.

According to some embodiments of the present application, optionally, the insulating material layer 3 is tightly attached to the cell connection piece 2.

The tight connection of the insulating-material layer 3 to the cell connecting plate 2 ensures that the insulating-material layer 3 is reliably bonded to the cell connecting plate 2, so that the insulating-material layer 3 is held firmly on the cell connecting plate 2 during operation of the cell or cell module and is not easily loosened or peeled off. This can be achieved in particular by the application process of the insulating-material layer 3, such as thermal spraying, physical vapor deposition or chemical vapor deposition. Advantageously, this tight connection can be ensured by a pretreatment before the insulating-material layer 3 is arranged on the cell connection piece 2. For example, the area to which the insulating-material layer 3 is to be applied is roughened before the thermal spraying. As another example, the region to which the insulating-material layer 3 is to be applied is degreased before physical vapor deposition or chemical vapor deposition.

According to some embodiments of the present application, optionally, the layer of heat sensitive material 4 is tightly attached to the layer of insulating material 3. This ensures that the heat-sensitive material layer 4 is reliably attached to the insulating material layer 3, so that the pack heat-sensitive material layer 4 is firmly held on the insulating material layer 3 during operation of the battery or battery module and is not easily loosened or peeled off. This achieves a reliable connection of the temperature sampling structure comprising the insulating-material layer 3 and the heat-sensitive material layer 4 to the battery tab 2. This can be achieved in particular by a process of application of the layer 4 of heat-sensitive material, such as electroplating, thermal spraying, physical vapour deposition or chemical vapour deposition. Likewise, the tight connection may be ensured by pretreating the insulating-material layer 3 before the heat-sensitive material layer 4 is arranged on the insulating-material layer 3.

The tight connection between the battery tab 2, the insulating-material layer 3 and the heat-sensitive material layer 4 in the above-described embodiments of the application increases the reliability of the temperature sampling compared to the adhesive, adhesive or overlapping connection of the battery tabs, which is common in the prior art, so that the temperature sampling effected with the battery connecting element 1 can be reliably operated over the entire life of the battery or battery module.

According to some embodiments of the present application, optionally, the insulating material layer 3 is provided on the cell connection piece 2 by thermal spraying, physical vapor deposition or chemical vapor deposition; and/or the layer of thermally sensitive material 4 is provided on the layer of insulating material 3 by electroplating, thermal spraying, physical vapour deposition or chemical vapour deposition.

The appropriate application process can thus be selected according to the specific materials and/or specific process requirements of the insulating-material layer 3 and the heat-sensitive material layer 4.

According to some embodiments of the present application, optionally, the thickness of the insulating-material layer 3 and the heat-sensitive material layer 4 is in the micrometer scale or the nanometer scale.

In this case, the temperature sampling structure on the cell terminal plate 2 is realized as thinly as possible by providing the insulating-material layer 3 and the heat-sensitive material layer 4 below the millimeter level, i.e., on the micrometer level or even on the nanometer level, so that the accuracy of the temperature sampling performed by the heat-sensitive material layer 4 can be advantageously ensured, the occurrence of temperature gradients can be avoided as far as possible, and the temperature sampling can be very quickly and dynamically responded to temperature changes of the cell terminal plate 2.

According to some embodiments of the present application, the thickness of the insulating material layer 3 and the thermal sensitive material layer 4 are optionally below 500 microns, respectively.

Therefore, the whole temperature sampling structure comprising the insulating material layer 3 and the heat-sensitive material layer 4 has extremely small thermal resistance, thereby ensuring extremely low temperature sampling error and high temperature sampling response speed.

According to some embodiments of the present application, optionally, the insulating-material layer 3 is made of a ceramic material, which is magnesium oxide, aluminum oxide or zirconium oxide.

Since ceramic materials mostly have good electrical insulation and chemical stability, they are particularly suitable as insulating materials in the battery connecting element 1 in the present application. In particular, the ceramic material can also be advantageously applied to the cell connection plate 2 by thermal spraying, physical vapor deposition or chemical vapor deposition.

According to some embodiments of the present application, the heat sensitive material layer 4 is optionally configured as a thermal resistance layer or a thermocouple layer.

In contrast to thermistors, such as NTCs or PTCs, which are usually composed of sintered semiconductor materials, thermal resistors or thermocouples are mostly made of pure metals and/or alloys and can therefore be arranged more simply on the insulating-material layer 3. In this case, the use of a thermal resistor layer or a thermocouple layer as the thermal sensitive material layer 4 is particularly preferred, so that the production of the battery connecting element 1 can be simplified.

According to some embodiments of the present application, optionally, the thermal resistance layer is a Pt100 platinum thermal resistance layer or a Pt1000 platinum thermal resistance layer; and/or the thermocouple layer is a nickel-chromium-nickel-silicon thermocouple layer, a copper-nickel thermocouple layer or an iron-copper-nickel thermocouple layer.

Because the platinum thermistor has accurate measurement, good stability and reliable performance, a Pt100 platinum thermistor layer or a Pt1000 platinum thermistor layer may be preferably used for the thermosensitive material layer 4. Further, it is also conceivable to form the thermosensitive material layer 4 using a couple pair composed of nichrome-nickel silicon, copper-copper nickel, or iron-copper nickel, thereby manufacturing the thermosensitive material layer 4 at a relatively low cost.

According to some embodiments of the present application, optionally, the area of the insulating-material layer 3 is larger than the area of the heat-sensitive material layer 4.

As this is shown in fig. 3 to 5, by such a design it can be ensured that the heat-sensitive material layer 4 does not contact the battery tab 2, advantageously protecting the heat-sensitive material layer 4.

Fig. 6 illustrates a schematic diagram of a harness bulkhead assembly 8 provided for some embodiments of the present application.

The present application further provides a wire harness isolation plate assembly 8 for a battery module, which includes: at least one battery connecting element 1 according to some embodiments of the present application; and a temperature sampling wire 5 for connection with a sampling circuit 6, wherein the temperature sampling wire 5 is electrically connected with the thermosensitive material layer 4 of the battery connecting element 1.

Here, the harness partition plate assembly 8 for a battery module is configured as an integrated assembly for connecting a plurality of battery cells 20 in series or in parallel or in series-parallel in the battery module 100. For example, the harness separator assembly 8 may be constructed in the first portion 11 of the battery module 100.

As shown in fig. 6, the harness isolation board assembly 8 may further include a harness isolation board 9, where the harness isolation board 9 is used to isolate the battery cell 20 from the sampling circuit 6, and plays a role in isolating the sampling circuit 6 from the battery cell 20. The sampling circuit 6 may be a part of the harness partition plate assembly 8, but may be a part separate from the harness partition plate assembly 8.

The sampling circuit 6 may be bonded to the wire harness isolation plate 9. The sampling circuit 6 is used for realizing the transmission of temperature and voltage signals in the battery module 100. An FPC flexible circuit board or a PCB printed circuit board may be selected for the sampling circuit 6.

As can be seen from fig. 6, the thermosensitive material layer 4 of the battery connecting member 1 is electrically connected to the sampling circuit 6 through the temperature sampling wire 5.

In the technical solution of the embodiment of the present application, the battery connecting element 1 according to some embodiments of the present application is advantageously used in the harness isolation board assembly 8, which can improve the accuracy and response speed of temperature sampling, and can also eliminate the integration of thermosensitive devices on the sampling circuit 6 and the process flow of joining such thermosensitive devices to the battery connecting sheet 2, thereby facilitating the realization of automated production and improving the production tact.

Fig. 7 is a schematic diagram illustrating connection between the battery connecting element 1 and the sampling circuit 6 according to some embodiments of the present disclosure. Fig. 8 is a schematic exploded view of the connection of the battery connection element 1 to the sampling circuit 6 according to some embodiments of the present application. Fig. 7 and 8 schematically show only the sampling circuit 6.

As can be seen from fig. 7 and 8, the temperature sampling wires 5 for connection with the sampling circuit 6 are connected to the thermosensitive material layer 4 of the battery connecting member 1, particularly to both ends of the thermosensitive material layer 4.

In the case where the thermosensitive material layer 4 is a thermal resistance layer, the temperature sampling wires 5 may be connected to both end regions of the thermal resistance, particularly, a Pt100 platinum thermistor or a Pt1000 platinum thermistor. Two temperature sampling wires 5 are schematically shown in fig. 7 and 8, however, three or four temperature sampling wires 5 may be used to connect the thermal resistance layer in consideration of the loss compensation.

In the case where the thermosensitive material layer 4 is a thermocouple layer, two temperature sampling wires 5 may be connected to one of a pair of thermocouples made of different metals or alloys, respectively. For example, in the case of a nickel-chromium-nickel-silicon thermocouple pair, one temperature sampling wire 5 is connected to nickel-chromium alloy, and the other temperature sampling wire 5 is connected to nickel-silicon alloy.

According to some embodiments of the present application, optionally, the temperature sampling wire 5 is connected to the heat sensitive material layer 4 and the sampling circuit 6 by a bonding process or ultrasonic welding.

In the present application, a bonding process, i.e. a wire bonding process, may advantageously be used to contact the thermal sensitive material layer 4 and the sampling circuit 6. The temperature sampling wire 5 can be tightly welded with the to-be-connected regions on the thermosensitive material layer 4 and the sampling circuit 6 by using heat, pressure and ultrasonic energy in the bonding process, and bonding on the atomic scale therebetween is realized, so that temperature data sampled by the thermosensitive material layer 4 is reliably transmitted to the sampling circuit 6 through the temperature sampling wire 5. Alternatively, cold joining processes such as ultrasonic welding are also contemplated herein.

Also shown in fig. 7 and 8, a pad 7 may be provided between the sampling circuit 6 and the sampling circuit 6.

According to some embodiments of the present application, optionally, the temperature sampling wire 5 is configured as a bonding wire.

By using the bonding wire to realize the connection between the thermosensitive material layer 4 and the sampling circuit 6, the reliability of the electrical connection and the electrical signal transmission can be ensured.

According to some embodiments of the application, optionally, the bonding wire is made of aluminum, copper or silver.

In this regard, the appropriate bonding wire material may be selected according to the specific material of the thermosensitive material layer 4, process requirements, and/or environmental requirements, etc.

According to some embodiments of the application, optionally, the bonding wire is bonded to the sampling circuit by means of a nickel plate.

The nickel sheet can be used as the bonding pad 7 on the sampling circuit 6, so that the bonding pad 7 is prevented from falling off or bonding failure caused by the fact that the bonding pad 7 needs to bear shearing force in the bonding process, the sampling circuit 6 is favorably protected, and the bonding reliability is ensured.

According to some embodiments of the present application, optionally, an epoxy resin is applied on at least the heat sensitive material layer 4 of the battery connecting element 1.

Since moisture may occur in the interior of the battery or the battery module 100, in order to prevent the heat sensitive material layer 4 from being short-circuited, it is advantageous to apply an epoxy resin, not shown, at least on the heat sensitive material layer 4 to insulate the influence of moisture. In particular, an epoxy may be applied over the entire temperature sampling structure including the insulating material layer 3 and the heat sensitive material layer 4 to provide protection against moisture, vibration, peeling, etc. to the temperature sampling structure. It is particularly preferable to apply epoxy on the thermosensitive material layer 4 with the temperature sampling wire attached, thereby further protecting the attachment portions, particularly the bonding pads, on the thermosensitive material layer 4.

According to some embodiments of the application, optionally, the epoxy is applied by a dispensing process.

The automation degree of the production of the wire harness isolation board assembly 8 for the battery module 100 can be further improved by using the dispensing process, and the production tact is improved.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (20)

1. A battery connection element (1), characterized in that the battery connection element (1) comprises:

a battery connection tab (2);

an insulating material layer (3) arranged on the battery connection piece (2); and

a heat-sensitive material layer (4) arranged on the insulating material layer (3), the heat-sensitive material layer (4) being used for temperature sampling.

2. Cell connecting element (1) according to claim 1, characterised in that the insulating-material layer (3) is tightly connected to the cell connection piece (2).

3. A battery connecting element (1) according to claim 2, characterized in that said layer of heat-sensitive material (4) is tightly attached to said layer of insulating material (3).

4. A battery connection element (1) according to one of claims 1 to 3, characterized in that the layer of insulating material (3) is provided on the battery connection tab by thermal spraying, physical vapour deposition or chemical vapour deposition; and/or the layer of heat-sensitive material (4) is arranged on the layer of insulating material (3) by electroplating, thermal spraying, physical vapour deposition or chemical vapour deposition.

5. A battery connecting element (1) according to one of claims 1 to 3, characterized in that the thickness of the insulating material layer (3) and the heat sensitive material layer (4) is in the micrometer range or the nanometer range.

6. A battery connecting element (1) according to claim 5, characterized in that the thickness of said insulating material layer (3) and said heat sensitive material layer (4) are below 500 μm, respectively.

7. A battery connecting element (1) according to one of claims 1 to 3, characterized in that the insulating-material layer (3) is made of a ceramic material, which is magnesia, alumina or zirconia.

8. Cell connection element (1) according to one of claims 1 to 3, characterized in that the layer of thermally sensitive material (4) is configured as a thermoresistive layer or as a thermocouple layer.

9. The battery connecting element (1) according to claim 8, wherein the thermal resistance layer is a Pt100 platinum thermal resistance layer or a Pt1000 platinum thermal resistance layer; and/or the thermocouple layer is a nickel-chromium-nickel-silicon thermocouple layer, a copper-nickel thermocouple layer or an iron-copper-nickel thermocouple layer.

10. A battery connecting element (1) according to one of claims 1 to 3, characterized in that the area of the insulating-material layer (3) is larger than the area of the heat-sensitive-material layer (4).

11. A wire harness bulkhead assembly (8) for a battery module (100), the wire harness bulkhead assembly (8) comprising:

at least one battery connecting element (1) according to one of claims 1 to 10; and

a temperature sampling wire (5) for connection with a sampling circuit (6),

the temperature sampling lead (5) is electrically connected with the thermosensitive material layer (4) of the battery connecting element (1).

12. The harness insulation board assembly (8) according to claim 11, wherein the temperature sampling wire (5) is connected to the heat sensitive material layer (4) and the sampling circuit (6) by a bonding process or ultrasonic welding.

13. The wire harness insulation board assembly (8) according to claim 12, wherein the temperature sampling wire (5) is configured as a bonding wire.

14. The wire harness bulkhead assembly (8) of claim 13, wherein the bonding wires are made of aluminum, copper, or silver.

15. Harness insulation board assembly (8) according to claim 13 or 14, characterised in that said bonding wires are bonded to the sampling circuit (6) by means of nickel sheets.

16. Harness insulation board assembly (8) according to one of the claims 11 to 14, characterized in that epoxy resin is applied on at least the heat sensitive material layer (4) of the battery connection element (1).

17. The harness insulation board assembly (8) according to claim 16, wherein the epoxy is applied by a spot-gluing process.

18. A battery module (100), characterized in that the battery module (100) comprises at least one battery connecting element (1) according to one of claims 1 to 10 and/or a wiring harness separator plate assembly (8) according to one of claims 11 to 17.

19. A battery, characterized in that it comprises a battery module (100) according to claim 18.

20. An electrical device, comprising the battery of claim 19, wherein the battery is configured to provide electrical power to the electrical device.

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