CN220172325U - Electric connection assembly and battery module - Google Patents

Abstract

The utility model provides an electric connection assembly and a battery module, wherein the electric connection assembly comprises an insulating mounting plate, a busbar and a circuit board; the bus bar is fixed on the insulating mounting plate and comprises a first conducting plate, a second conducting plate and a third conducting plate, a first bus bar end is arranged on the first conducting plate, a second bus bar end is arranged on the second conducting plate, and a sampling end is arranged on the third conducting plate; the projection of the circuit board on the plane where the insulating mounting plate is located is overlapped with at least partial area of the insulating mounting plate, a first through hole corresponding to the first bus bar end, a second through hole corresponding to the second bus bar end and a third through hole corresponding to the sampling end are respectively formed in the circuit board, and the first bus bar end is electrically connected with the circuit board through the first through hole, the second bus bar end is electrically connected with the sampling end through the second through hole and the third through hole. The utility model solves the problems of complex connection structure between the battery tab and the circuit board and low space utilization rate in the existing battery module.

Description

Electric connection assembly and battery module

Technical Field

The utility model relates to the technical field of batteries, in particular to an electric connection assembly and a battery module.

Background

Because lithium ion batteries have the advantages of high voltage, large capacity, small volume, light weight, wide operating temperature range and the like, lithium ion batteries have been widely used in various fields, particularly in the field of electric vehicles. At present, the number of batteries of an electric vehicle in series-parallel connection is large, and in order to ensure the safety and maintainability of the batteries in the use process, a battery system adopts a modularized design, and a plurality of batteries are connected in series-parallel to form a battery module. The battery tab is welded and fixed on the copper bar in series-parallel connection to realize series-parallel connection of the battery, the copper bar is a part of the busbar, and meanwhile, the battery module is provided with a sampling structure to monitor voltage and current signals of the battery module, so that the safety of the battery module is guaranteed.

The sampling structure and the bus structure in the traditional technology are generally respectively arranged, the bus structure is generally formed by firstly installing a lug support and then putting a bus bar, then welding the bus bar and a battery core lug, and leading out a total first bus terminal and a total second bus terminal of a battery module on the bus bar, wherein the total first bus terminal and the total second bus terminal are respectively connected with a circuit board through a wire harness so as to realize electric connection between the battery module and the circuit board; the sampling structure is characterized in that the signal acquisition plate is arranged on the lug support, the nickel sheet is arranged on the signal acquisition plate, the battery cell lug is electrically connected with the nickel sheet on the signal acquisition plate, the signal acquisition plate is connected with the circuit board through the wiring harness to complete sampling, and the lug support is connected with the circuit board through the screw locking to realize fixed connection, so that on one hand, the cost of additional components is increased, on the other hand, the additional working procedures are increased, and the assembly efficiency is reduced.

Disclosure of Invention

The utility model aims to solve the problems of complex connection structure between the battery tab and the circuit board and low space utilization rate in the existing battery module.

To solve the above problems, a first aspect of the present utility model provides an electrical connection assembly, including an insulating mounting board, a bus bar, and a circuit board;

the bus bar is fixed on the insulating mounting plate and comprises a first conducting sheet and a second conducting sheet, a first bus bar end is arranged on the first conducting sheet, a second bus bar end is arranged on the second conducting sheet, the polarities of the first bus bar end and the second bus bar end are opposite, the first conducting sheet and the second conducting sheet are mutually insulated on the insulating mounting plate, the bus bar also comprises a third conducting sheet, a sampling end is arranged on the third conducting sheet,

the projection of the circuit board on the plane of the insulating mounting plate is overlapped with at least part of the area of the insulating mounting plate, a first through hole corresponding to the first bus bar end is arranged on the circuit board, a second through hole corresponding to the second bus bar end is arranged on the circuit board, a third through hole corresponding to the sampling end is arranged on the circuit board, the first bus bar end is electrically connected with the circuit board through the first through hole, the second bus bar end is electrically connected with the circuit board through the second through hole, a third sampling circuit is arranged on the circuit board, the sampling end is connected with the third sampling circuit through the third through hole,

The first conductive sheet and the second conductive sheet are disposed on an edge of the insulating mounting plate along a first direction.

Further, the first conductive sheet and the second conductive sheet are disposed on edges of opposite sides of the insulating mounting board in a first direction, the sampling terminal is disposed on the edge of the insulating mounting board in a second direction, and the first direction and the second direction are perpendicular to each other.

Further, the circuit board further comprises a first sampling line and a second sampling line, the first bus terminal is electrically connected with the first sampling line through the first through hole, and the second bus terminal is electrically connected with the second sampling line through the second through hole.

Further, the cross-sectional area of the first manifold pole is greater than the cross-sectional area of the sampling pole, and the cross-sectional area of the second manifold pole is greater than the cross-sectional area of the sampling pole.

Further, the first conductive sheet includes a first fixing portion fixedly connected with the insulating mounting board, and a first connecting portion connected with the circuit board, the first connecting portion forms the first bus bar end, and the second conductive sheet includes a second fixing portion fixedly connected with the insulating mounting board, and a second connecting portion connected with the circuit board.

Further, the first connecting portion is bent in a direction away from the insulating mounting plate to form the first bus bar end, and the second connecting portion is bent in a direction away from the insulating mounting plate to form the second bus bar end.

Further, the first through hole is provided with a first conductive part, the second through hole is provided with a second conductive part, the first bus terminal is electrically connected with the circuit board through the first conductive part, and the second bus terminal is electrically connected with the circuit board through the second conductive part.

Further, the first conductive part comprises a first conductive layer and a second conductive layer, the first conductive layer is arranged at the edge of one surface of the first through hole, which is away from the bus bar, and the second conductive layer is arranged on the hole wall of the first through hole;

and/or, the second conductive part comprises a fourth conductive layer and a fifth conductive layer, the fourth conductive layer is arranged at the edge of one surface of the second through hole, which is away from the busbar, and the fifth conductive layer is arranged on the hole wall of the second through hole.

Further, the first conductive part further comprises a third conductive layer, and the third conductive layer is arranged at the edge of one surface of the first through hole facing the busbar;

And/or, the second conductive part further comprises a sixth conductive layer, and the sixth conductive layer is arranged at the edge of the second through hole facing the surface of the busbar.

Further, the first busbar terminal penetrates through the first through hole and is connected with the circuit board; the second bus terminal penetrates through the second through hole and is connected with the circuit board.

Further, a first filler gap is arranged between the outer peripheral surface of the first bus bar end and the second conductive layer, a first welding body is filled in the first filler gap, and the first bus bar end is connected with the circuit board through the first welding body;

and/or a second filler gap is arranged between the outer peripheral surface of the second bus bar end and the fifth conductive layer, a second welding body is filled in the second filler gap, and the second bus bar end is connected with the circuit board through the second welding body;

the first welded body and the second welded body are formed by filler welding.

Further, the difference between the outer diameter and the inner diameter of the first conductive layer is larger than the difference between the outer diameter and the inner diameter of the third conductive layer;

and/or, the difference between the outer diameter and the inner diameter of the fourth conductive layer is greater than the difference between the outer diameter and the inner diameter of the sixth conductive layer.

Further, the surface of the first connecting part is coated with a first insulating layer, and the surface of the second connecting part is coated with a second insulating layer.

Further, the insulating mounting plate is further provided with a connecting column, the circuit board is further provided with a fourth through hole, and the connecting column is connected with the circuit board through the fourth through hole.

Further, the surface of the connecting column is coated with a third insulating layer.

Further, the thickness of the third insulating layer is equal to the thickness of the first insulating layer; the thickness of the third insulating layer is equal to the thickness of the second insulating layer.

Further, the insulating mounting plate is further provided with a limiting column, the circuit board is further provided with a fifth through hole, and the limiting column is connected with the circuit board through the fifth through hole.

Further, the surface of the limit post is coated with a fourth insulating layer.

Further, the thickness of the fourth insulating layer is greater than or equal to the thickness of the first insulating layer; the thickness of the fourth insulating layer is greater than or equal to the thickness of the second insulating layer.

Further, the thickness of the fourth insulating layer is larger than that of the first insulating layer, the thickness of the fourth insulating layer is h4, and the thickness of the first insulating layer is h1, wherein h4-h1 is more than or equal to 0.05mm and less than or equal to 0.2mm;

And/or the thickness of the fourth insulating layer is greater than that of the second insulating layer, and the thickness of the second insulating layer is h2, wherein h4-h2 is more than or equal to 0.05mm and less than or equal to 0.2mm.

Further, a plurality of third conducting strips are arranged on the insulating mounting plate, two of the third conducting strips which are arbitrarily adjacent along the first direction are arranged between the first conducting strips and the third conducting strips, and grooves penetrating through the insulating mounting plate are formed between the second conducting strips and the third conducting strips.

Further, along the first direction, the third conductive sheet is provided with a first notch, and the groove is arranged at the first notch.

Further, the third conductive sheet is further provided with a second notch along the first direction, the first notch and the second notch are oppositely arranged, and along the second direction, the first notch and the second notch are not overlapped or are not completely overlapped.

A second aspect of the present utility model provides a battery module comprising a plurality of stacked cells, and further comprising an electrical connection assembly according to any one of the first aspects, the electrical connection assembly being connected to the cells.

According to the electric connection assembly and the battery module, the first bus electrode terminal and the second bus electrode terminal are respectively and electrically connected with the circuit board, so that the total positive voltage and the total negative voltage of the battery module can be directly conducted to the circuit board through the two bus electrode terminals, positive electrode output and negative electrode output of the battery module can be realized without positive electrode wire bundles and negative electrode bundles, the space utilization rate of the battery module is improved, and the energy density of the battery module is improved; in addition, sampling extreme and circuit board electric connection on the insulating mounting panel, sampling extreme gathers the voltage of busbar and can transmit to the circuit board, realize the collection effect of circuit board to single voltage, sampling extreme and circuit board direct connection need not to gather the pencil, be favorable to further improving battery module's space utilization, and with sampling extreme direct and circuit board fixed connection, the installation is simple convenient, improved the efficiency of electric connection assembly, saved conventional circuit board and tab support and passed through bolt fixed connection's process, reduced manufacturing cost.

Drawings

Fig. 1 is a schematic perspective view of an electrical connection assembly according to an embodiment of the present utility model;

FIG. 2 is a schematic view of an insulating mounting plate and a bus bar according to an embodiment of the present utility model;

fig. 3 is a schematic structural diagram of a circuit board according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a partial enlarged structure of FIG. 3;

FIG. 5 is a schematic top view of an electrical connection assembly according to an embodiment of the present utility model;

FIG. 6 is a schematic cross-sectional view of FIG. 5;

fig. 7 is a schematic structural diagram of a first conductive sheet according to an embodiment of the present utility model.

Detailed Description

The technical scheme of the utility model is clearly and thoroughly described below with reference to the accompanying drawings. In the description of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. Furthermore, in the description of the present utility model, the meaning of "at least one" means one or more, unless specifically defined otherwise.

In the description of the present specification, the term "on the basis of the above-described embodiment" means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one preferred embodiment or preferred example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same implementations or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The battery module generally comprises a plurality of stacked battery cells, adjacent battery cells can be separated by foam, the battery cells are stacked in the thickness direction of the battery cells to form the battery module, and the battery cells in the battery module can be connected in series or in parallel. The battery module further comprises a shell, all the battery cells are accommodated in the shell, so that the battery module can be better protected, and the safety of the battery cells in the battery module is guaranteed. Each cell comprises a positive electrode lug and a negative electrode lug, and the positive electrode lug and the negative electrode lug can extend to the outside of the shell from one side of the cell so as to be connected with an external electric connecting piece conveniently.

The battery module further comprises an electric connection assembly, the electric connection assembly is arranged on one side, extending out of the shell, of the positive electrode lug (namely the first electrode lug) and the negative electrode lug (namely the second electrode lug) of the battery core, and the electric connection assembly and the battery core are electrically connected through the positive electrode lug and the negative electrode lug.

Referring to fig. 1 to 3, the electrical connection assembly includes an insulation mounting plate 100, bus bars and a circuit board 200, wherein the insulation mounting plate 100 is disposed between the battery cell and the circuit board 200, at least one bus bar is embedded in the insulation mounting plate 100, and illustratively, two bus bars are embedded in the insulation mounting plate 100 in fig. 2, and the two bus bars are disposed side by side along a second direction (i.e., an x-axis direction in fig. 2) of the insulation mounting plate 100.

The bus bar includes a first conductive sheet 110a, a second conductive sheet 110b, and a third conductive sheet 120, the first conductive sheet 110a and the second conductive sheet 110b being disposed on an edge of the insulative mounting plate 100 in a first direction (i.e., a y-axis direction in fig. 2), and the first conductive sheet 110a and the second conductive sheet 110b being insulated from each other on the insulative mounting plate 100, wherein the first direction and the second direction are perpendicular to each other. The number of the third conductive sheets 120 may be plural, and the plural third conductive sheets 120 are independently disposed and insulated from each other. Grooves penetrating through the insulating mounting plate 100 are formed between any two adjacent third conductive sheets 120 along the first direction, and grooves penetrating through the insulating mounting plate 100 are formed between the first conductive sheet 110a and the third conductive sheet 120, and between the second conductive sheet 110b and the third conductive sheet 120. As an alternative embodiment, the first conductive sheet 110a is made of a copper sheet or an aluminum sheet or a tin sheet, the second conductive sheet 110b is made of a copper sheet or an aluminum sheet or a tin sheet, and the third conductive sheet 120 is made of a copper sheet or an aluminum sheet or a tin sheet.

The first conductive sheet 110a is provided with a first bus bar end 130, the second conductive sheet 110b is provided with a second bus bar end 140, and the polarities of the first bus bar end 130 and the second bus bar end 140 are opposite, that is, the first bus bar end 130 may be the first bus bar end, the second bus bar end 140 is the second bus bar end, or the first bus bar end 130 is the second bus bar end, and the second bus bar end 140 is the first bus bar end. The first conductive sheet 110a and the second conductive sheet 110b are respectively used for connecting the total positive electrode tab and the total negative electrode tab of the battery module, and the first bus bar terminal 130 and the second bus bar terminal 140 are respectively arranged on the first conductive sheet 110a and the second conductive sheet 110b, so that positive electrode output and negative electrode output of the battery module can be realized. For example, if the first bus bar terminal 130 is a first bus bar terminal and the second bus bar terminal 140 is a second bus bar terminal, the total positive electrode tab is electrically connected with the first bus bar terminal 130 through the first conductive sheet 110a, so as to realize the positive electrode output of the battery module, and the total negative electrode tab is electrically connected with the second bus bar terminal 140 through the second conductive sheet 110b, so as to realize the negative electrode output of the battery module.

The third conducting strip 120 is provided with a sampling electrode terminal 121, the third conducting strip 120 is used for welding the positive electrode lug and the negative electrode lug of the battery core in the battery module, and the sampling electrode terminal 121 arranged on the third conducting strip 120 can realize the collection effect on single voltage. In addition, the battery cells in the battery module can be connected in series or in parallel through the third conductive sheet 120, wherein when the positive electrode lugs of different battery cells are connected to the same third conductive sheet 120, the negative electrode lugs of different battery cells are connected to the same third conductive sheet 120, and the third conductive sheet 120 connected by the positive electrode lugs and the third conductive sheet 120 connected by the negative electrode lugs are different third conductive sheets 120, the parallel connection between different battery cells can be realized; when the positive electrode tab and the negative electrode tab of different electric cells are connected to the same third conductive sheet 120, serial connection between different electric cells can be achieved.

Illustratively, two bus bars are disposed on the insulating mounting plate 100, the two bus bars are disposed side by side along the second direction of the insulating mounting plate 100, and the two bus bars are insulated from each other, and the plurality of battery cells in the battery module are connected in series between the battery cells through the two bus bars. The specific implementation mode is as follows: the battery cells of the battery module are stacked along the first direction of the insulating mounting plate 100, positive electrode lugs and negative electrode lugs of the same battery cell are arranged along the second direction of the insulating mounting plate 100, and the positive electrode lugs and the negative electrode lugs of adjacent battery cells are alternately arranged along the first direction of the insulating mounting plate 100; after the positive electrode tab and the negative electrode tab of the adjacent battery cells pass through the grooves, the positive electrode tab and the negative electrode tab are bent and connected to the same third conductive sheet 120, and in the second direction of the insulating mounting plate 100, the positive electrode tab and the negative electrode tab are not connected to the third conductive sheet 120 adjacent to the third conductive sheet 120 (i.e., no external part is connected to the third conductive sheet 120), and in the first direction of the insulating mounting plate 100, the positive electrode tab and the negative electrode tab of the adjacent battery cells pass through the grooves and are not connected to the same third conductive sheet 120, but the positive electrode tab and the negative electrode tab are connected to the third conductive sheet 120 which are diagonal to each other, so that the positive electrode tab and the negative electrode tab of the adjacent battery cells can be connected to each other in a series connection mode by arranging two bus bars arranged side by side, and in the second direction of the insulating mounting plate 100 and in the first direction of the insulating mounting plate 100, and simultaneously the third conductive sheet 120 which is connected to any part is not connected to the positive electrode tab and the negative electrode tab are alternately arranged, and the positive electrode tab and the negative electrode tab of the adjacent battery cells pass through the grooves and are not connected to any external part, and the positive electrode tab and the negative electrode tab of the adjacent battery cells are bent and connected to the same third conductive sheet 120, and the positive electrode tab and the negative electrode tab of the battery cell module can not be connected to the positive electrode tab and the negative electrode tab can not be connected to the positive electrode tab and the negative electrode tab.

Of course, those skilled in the art can also adjust the number of the bus bars and the connection manner of the positive electrode tab and the negative electrode tab with the third conductive sheet 120, so that the multiple battery cells in the battery module can be connected in parallel through the bus bars, which is not further described herein.

On the basis of the above-described embodiment, the first conductive sheet 110a and the second conductive sheet 110b are disposed on the edges of the opposite sides of the insulative mounting board 100 in the first direction, and the sampling terminal 121 is disposed on the edges of the insulative mounting board 100 in the second direction. Therefore, the first conductive sheet 110a and the second conductive sheet 110b are separated, so that the first bus bar terminal 130 and the second bus bar terminal 140 can be separated, and the risk of short circuit caused by too close distance between the first bus bar terminal 130 and the second bus bar terminal 140 is avoided; and set up sampling extreme 121 along insulating mounting panel 100's second direction, can realize that the extreme that converges sets up respectively in insulating mounting panel 100's different sides with the sampling extreme, can avoid converging extreme and sampling extreme setting and lead to strong electric signal and weak electric signal mutual interference in same side, influence sampling accuracy, influence sampling result's accuracy.

As an alternative embodiment, the insulating mounting plate 100 is made of plastic, and the first conductive sheet 110a, the second conductive sheet 110b, and the third conductive sheet 120 may be integrally injection molded with the insulating mounting plate, that is, when the insulating mounting plate is injection molded, the first conductive sheet 110a, the second conductive sheet 110b, and the third conductive sheet 120 are placed therein, so that the first conductive sheet 110a, the second conductive sheet 110b, and the third conductive sheet 120 are embedded in the insulating mounting plate 100, and through holes may be formed in the first conductive sheet 110a, the second conductive sheet 110b, and the third conductive sheet 120, respectively, so that the first conductive sheet 110a, the second conductive sheet 110b, and the third conductive sheet 120 are fixed on the insulating mounting plate 100 after the hot melt adhesive injected into the through holes is cured, so as to improve the connection stability of the first conductive sheet 110a, the second conductive sheet 110b, and the third conductive sheet 120 with the insulating mounting plate 100.

Referring to fig. 2, the first conductive sheet 110a, the second conductive sheet 110b, and the third conductive sheet 120 protrude from the insulating mounting plate 100 in the thickness direction of the insulating mounting plate 100 to prevent the sides or surfaces of the first conductive sheet 110a, the second conductive sheet 110b, and the third conductive sheet 120 from being covered with the hot melt adhesive, thereby insulating the sides or surfaces of the first conductive sheet 110a, the second conductive sheet 110b, and the third conductive sheet 120, increasing the internal resistances of the first conductive sheet 110a, the second conductive sheet 110b, and the third conductive sheet 120, and affecting the conductivities of the first conductive sheet 110a, the second conductive sheet 110b, and the third conductive sheet 120. As an alternative embodiment, the first conductive sheet 110a protrudes from the insulating mounting plate 0.1mm to 0.05mm, the second conductive sheet 110b protrudes from the insulating mounting plate 0.1mm to 0.05mm, and the third conductive sheet 120 protrudes from the insulating mounting plate 0.1mm to 0.05mm in the thickness direction of the insulating mounting plate 100. In addition, in this embodiment, a recess may be further disposed on the insulating mounting board 100, so as to avoid causing poor injection molding of the insulating mounting board 100 when the insulating mounting board 100 is injection-molded, thereby affecting the quality of the electrical connection assembly. As an alternative embodiment, the concave portions may be provided at the edges of the two sides of the insulating mounting plate 100 in the first direction, or the concave portions may be provided at the edges of the two sides of the insulating mounting plate 100 in the second direction.

As shown in fig. 2 and 7, one end of the third conductive sheet 120 is bent towards a direction away from the insulating mounting plate 100 to form a sampling terminal 121, the sampling terminal 121 is integrally connected with the third conductive sheet 120, and an injection molding through hole is further formed at one end of the third conductive sheet 120 away from the sampling terminal 121. Specifically, the third conductive sheet 120 includes a first portion 122 and a second portion 123 disposed along a second direction, the sampling terminal 121 is integrally connected to an end portion of the first portion 122, the injection molding through hole is penetratingly disposed on the second portion 123, a first side edge of the first portion 122 is provided with a first notch, a groove is disposed at the first notch, a second side edge of the second portion 123 is provided with a second notch, the first side edge and the second side edge are two sides of the third conductive sheet 120 along the first direction respectively, so that the first notch and the second notch are disposed relatively, and the first notch and the second notch are not coincident or are not completely coincident along the second direction. Thus, the two sides of the first portion 122 and the second portion 123 along the first direction of the third conductive sheet 120 are not flush, so that the first portion 122 and the second portion 123 are arranged in a staggered manner. Therefore, the positive electrode lug and the negative electrode lug are convenient to pass through the grooves and then are welded on the third conductive sheet 120, and in addition, when the positive electrode lug and the negative electrode lug are simultaneously connected on the same third conductive sheet 120, the positive electrode lug and the negative electrode lug can be separated, the positions of the positive electrode lug and the negative electrode lug are limited, the lap joint of the positive electrode lug and the negative electrode lug is avoided, and the short circuit phenomenon caused by the contact of the positive electrode lug and the negative electrode lug on the same third conductive sheet 120 is avoided.

Referring to fig. 1 and 5, the projection of the circuit board 200 on the plane of the insulating mounting board 100 overlaps at least a part of the area of the insulating mounting board 100, the circuit board 200 is provided with a first through hole 210 corresponding to the first bus bar terminal 130, the circuit board 200 is provided with a second through hole 220 corresponding to the second bus bar terminal 140, the circuit board 200 is provided with a third through hole 230 corresponding to the sampling terminal 121, the first bus bar terminal 130 is electrically connected with the circuit board 200 through the first through hole 210, the second bus bar terminal 140 is electrically connected with the circuit board 200 through the second through hole 220, and the sampling terminal 121 is electrically connected with the circuit board 200 through the third through hole 230. Therefore, the first bus electrode terminal and the second bus electrode terminal are respectively and electrically connected with the circuit board, so that the total positive voltage and the total negative voltage of the battery module can be directly conducted to the circuit board through the two bus electrode terminals, positive electrode output and negative electrode output of the battery module can be realized without positive and negative electrode wire bundles, the space utilization rate of the battery module is improved, and the energy density of the battery module is improved; in addition, sampling extreme and circuit board electric connection on the insulating mounting panel, sampling extreme gathers the voltage of busbar and can transmit to the circuit board, realize the collection effect of circuit board to single voltage, sampling extreme and circuit board direct connection need not to gather the pencil, be favorable to further improving battery module's space utilization, and with sampling extreme direct and circuit board fixed connection, the installation is simple convenient, improved the efficiency of electric connection assembly, saved conventional circuit board and tab support and passed through bolt fixed connection's process, reduced manufacturing cost.

The specific dimensions of the first through hole 210, the second through hole 220, and the third through hole 230 are not further limited in this embodiment, but the dimensions of the first through hole 210, the second through hole 220, and the third through hole 230 are matched with those of the first bus bar terminal 130, the second bus bar terminal 140, and the sampling bar terminal 121 disposed corresponding thereto, thereby ensuring that the first bus bar terminal 130, the second bus bar terminal 140, and the sampling bar terminal 121 can pass through these through holes. Illustratively: the cross-sectional area of the first manifold terminal 130 is greater than the cross-sectional area of the sampling terminal 121, and the cross-sectional area of the first through-hole 210 is greater than the cross-sectional area of the third through-hole 230; the cross-sectional area of the second manifold terminal 140 is greater than the cross-sectional area of the sampling terminal 121, and the cross-sectional area of the second through-hole 220 is greater than the cross-sectional area of the third through-hole 230. The shapes of the first through hole 210, the second through hole 220, and the third through hole 230 are not further limited in this embodiment, but the shapes of the first through hole 210, the second through hole 220, and the third through hole 230 are matched with the shapes of the first bus bar terminal 130, the second bus bar terminal 140, and the sampling terminal 121 disposed corresponding thereto. Illustratively: the sampling terminal 121 is a cube, and the third through hole 230 is a circle; the first bus bar terminal 130 is rectangular parallelepiped, and the first through hole 210 is racetrack-shaped.

Specifically, the circuit board 200 is provided with a first sampling line, a second sampling line and a third sampling line, the three sampling lines are embedded in the circuit board 200, the first bus terminal 130 is electrically connected with the first sampling line through a first through hole 210, the second bus terminal 140 is electrically connected with the second sampling line through a second through hole 220, and the sampling terminal 121 is electrically connected with the third sampling line through a third through hole 230. The first sampling line, the second sampling line, and the third sampling line are not further limited in this embodiment, and those skilled in the art may set the first sampling line, the second sampling line, and the third sampling line in combination with the actual situation of the circuit board 200.

In this embodiment, the circuit board 200 may be an insulating circuit board, but conductive parts are disposed on the positions of the first through hole 210, the second through hole 220 and the third through hole 230 on the circuit board 200, for example, metal is electroplated on the positions of the through holes to form conductive parts or conductive components are disposed on the positions of the through holes, so that the through holes can be electrically connected with the first bus terminal 130, the second bus terminal 140 and the sampling terminal 121 respectively, and components connected to the circuit board 200 can be insulated from each other.

Specifically, the first through hole 210 is provided with a first conductive portion 211, the second through hole 220 is provided with a second conductive portion 221, the third through hole 230 is provided with a third conductive portion 231, the first bus terminal 130 is electrically connected to the circuit board 200 through the first conductive portion 211, the second bus terminal 140 is electrically connected to the circuit board 200 through the second conductive portion 221, and the sampling terminal 121 is electrically connected to the circuit board 200 through the third conductive portion 231. Each conductive part comprises three conductive layers, one conductive layer is arranged at the edge of one face, deviating from the bus bar, of the through hole, one conductive layer is arranged at the edge of one face, facing the bus bar, of the through hole, and the other conductive layer is arranged on the hole wall of the through hole and is connected with the other two conductive layers. The conductive layers in the respective conductive portions in this embodiment may be integrally formed.

The first conductive portion 211 includes a first conductive layer, a second conductive layer and a third conductive layer, where the first conductive layer is disposed at an edge of a surface of the first through hole 210 facing away from the bus bar, the second conductive layer is disposed at a hole wall of the first through hole 210, and the third conductive layer is disposed at an edge of a surface of the first through hole 210 facing toward the bus bar; the second conductive portion 221 includes a fourth conductive layer, a fifth conductive layer and a sixth conductive layer, where the fourth conductive layer is disposed at an edge of a face of the second through hole 220 facing away from the bus bar, the fifth conductive layer is disposed at a wall of the second through hole 220, and the sixth conductive layer is disposed at an edge of a face of the second through hole 220 facing the bus bar; the third conductive portion 231 includes a seventh conductive layer, an eighth conductive layer, and a ninth conductive layer, where the seventh conductive layer is disposed at an edge of a face of the third through hole 230 facing away from the bus bar, the eighth conductive layer is disposed at a wall of the third through hole 230, and the ninth conductive layer is disposed at an edge of a face of the third through hole 230 facing the bus bar. If the conductive portions are also disposed on other through holes of the circuit board 200, the other conductive portions may also have the above-described structure. Therefore, each conductive part adopts the structure, so that the conductive layer facing away from one side edge of the bus bar can be conveniently connected with each extreme in a welding way, and the conductive layer facing towards one side edge of the bus bar can prevent excessive metal solder (such as tin-based alloy) from overflowing during welding.

As an alternative embodiment, each conductive portion may use a pad, where the material of the pad is a metal material with better conductivity, and exemplarily: the bonding pad is made of tin, gold or silver. The shape of the pads matches the shape of the vias to which they are attached, illustratively: the first through hole 210 is circular, and the shape of the pad disposed on the first through hole 230 is also circular; the second through-hole 220 has a racetrack shape, and the pad disposed on the second through-hole 220 has a racetrack shape.

In this embodiment, the first bus terminal 130 is connected to the circuit board 200 through the first through hole 210, the second bus terminal 140 is connected to the circuit board through the second through hole 220, and the sampling terminal 121 is connected to the circuit board through the third through hole 230. After the first bus bar terminal 130, the second bus bar terminal 140 and the sampling terminal 121 respectively pass through the first through hole 210, the second through hole 220 and the third through hole 230, the first bus bar terminal 130 and the first through hole 210 can be electrically connected through welding, the second bus bar terminal 140 and the second through hole 220 can be electrically connected through welding, and the sampling terminal 121 and the third through hole 230 can be electrically connected through welding, so that the total positive voltage and the total negative voltage of the battery module are conducted onto the circuit board 200, and the collection effect of the circuit board 200 on single voltage is realized through the sampling terminal 121.

Specifically, a first filler gap is provided between the outer peripheral surface of the first bus bar terminal 130 and the second conductive layer, the first filler gap is filled with a first solder body, the first solder body includes a solder body d, and the first bus bar terminal 230 is connected with the circuit board 200 through the solder body; a second filler gap is provided between the outer circumferential surface of the second bus bar terminal 140 and the fifth conductive layer, and a second solder body is filled in the second filler gap, the second solder body includes a solder body d, and the second bus bar terminal 140 is connected with the circuit board 200 through the solder body; a third packing gap is provided between the outer circumferential surface of the sampling terminal 121 and the eighth conductive layer, and a third solder body is filled in the third packing gap, the third solder body includes a solder body d, and the sampling terminal 121 is connected with the circuit board 200 through the solder body.

Wherein the welded body d is formed by solidifying metal solder during welding connection. As an alternative embodiment, the depth of the solder d is 75% to 100% of the depth of the respective through-hole, and the area of the solder d is 75% to 100% of the sum of the area of the conductive layer facing away from the edge of the busbar and the area of the respective through-hole, whereby the reliability of the conductive layer on the respective through-hole and the respective extreme solder connection can be ensured.

On the basis of the above embodiment, each conductive layer may be provided in a circular ring shape, and the area of the conductive layer facing away from the one side edge of the bus bar is larger than the area of the conductive layer facing toward the one side edge of the bus bar, specifically, the difference between the outer diameter and the inner diameter of the first conductive layer is larger than the difference between the outer diameter and the inner diameter of the third conductive layer, the difference between the outer diameter and the inner diameter of the fourth conductive layer is larger than the difference between the outer diameter and the inner diameter of the sixth conductive layer, and the difference between the outer diameter and the inner diameter of the seventh conductive layer is larger than the difference between the outer diameter and the inner diameter of the ninth conductive layer. Thus, the problem of defects or safety due to the large area of the conductive layer facing the edge of the bus bar can be avoided.

In this embodiment, the specific numerical ranges of the difference between the outer diameter and the inner diameter of the conductive layer facing away from the edge of the busbar and the difference between the outer diameter and the inner diameter of the conductive layer facing toward the edge of the busbar are not further limited, and may be set by those skilled in the art according to practical situations. Illustratively, the difference R between the outer diameter and the inner diameter of the seventh conductive layer is 2mm, and the difference R between the outer diameter and the inner diameter of the ninth conductive layer is 0.3mm to 0.5mm.

In this embodiment, the first conductive sheet 110a includes a first fixing portion and a first connecting portion, the first fixing portion is fixedly connected with the insulating mounting board 100, the first connecting portion is connected with the circuit board 200, and the first connecting portion is bent in a direction away from the insulating mounting board 100 to form the first bus bar end 130. The second conductive sheet 110b includes a second fixing portion and a second connecting portion, the second fixing portion is fixedly connected with the insulating mounting board 100, the second connecting portion is connected with the circuit board 200, and the second connecting portion is bent in a direction away from the insulating mounting board 100 to form the second bus bar terminal 140. As an alternative embodiment, the first bus terminal 130, the second bus terminal 140, and the sampling terminal 121 may each use a tin pin, and in addition, in order to improve the overcurrent capability of the first bus terminal 130 and the second bus terminal 140, the first bus terminal 130 and the second bus terminal 140 may each be provided in plurality, and the number of the sampling terminals 121 may be set to one or a plurality according to the actual situation by those skilled in the art. The specific number of the first bus bar terminal 130, the second bus bar terminal 140, and the sampling terminal 121 in this embodiment is not specifically limited, and one skilled in the art may set the number according to the actual situation. Illustratively, the first and second bus terminals 130 and 140 are each provided in three, or the first and second bus terminals 130 and 140 are each provided in four, and the sampling terminal 121 is provided in one.

On the basis of the above embodiment, in order to improve the overcurrent capability of the first and second bus bar ends 130 and 140, the cross-sectional area of the first bus bar end 130 is larger than that of the sampling end 121, and the cross-sectional area of the second bus bar end 140 is larger than that of the sampling end 121.

In this embodiment, the surface of the first connection portion is coated with the first insulating layer 180, the surface of the second connection portion is coated with the second insulating layer 190, the surface of the first portion 122 is coated with the fifth insulating layer 170, the first insulating layer 180, the second insulating layer 190 and the fifth insulating layer 170 are all protruding to be disposed on the insulating mounting board 100, the first insulating layer 180, the second insulating layer 190 and the fifth insulating layer 170 may be made of the same material as the insulating mounting board 100, and the first insulating layer 180, the second insulating layer 190 and the fifth insulating layer 170 may be integrally formed with the insulating mounting board 100 or may be separately formed with the insulating mounting board 100. The first bus electrode 130 is protruded from the first insulating layer 180, the second bus electrode 140 is protruded from the second insulating layer 190, and the sampling electrode 121 is protruded from the fifth insulating layer 170, so as to avoid affecting the positive output and the negative output of the battery module and the voltage collection effect. Thus, by providing the first, second and fifth insulating layers 180, 190 and 170, the stability of the connection of the first, second and sampling terminals 130, 140 and 121 with the circuit board 200 and the flatness of the surface of the circuit board 200 can be ensured.

In this embodiment, the thicknesses of the first insulating layer 180, the second insulating layer 190, and the fifth insulating layer 170 are the same, so that the connection stability of the circuit board 200 can be ensured, and the surface flatness of the circuit board 200 can be ensured.

In this embodiment, the shapes of the first insulating layer 180, the second insulating layer 190, and the fifth insulating layer 170 are not further limited, and those skilled in the art may select according to actual situations, and they are exemplified: the first insulating layer 180 may be stepped, the second insulating layer 190 may be rectangular parallelepiped, and the fifth insulating layer 170 may have a "convex" shape in cross section.

In this embodiment, the insulating mounting board 100 is further provided with a connection post 160 at an edge of one side far from the sampling terminal 121, and the circuit board 200 is further provided with a fourth through hole 240, and the connection post 160 is connected to the circuit board 200 through the fourth through hole 240. Specifically, the connection post 160 is disposed on the edge of the insulating mounting board 100 along the second direction, and the connection post 160 is disposed away from the sampling terminal 121, and is fixedly connected with the circuit board 200, so as to avoid the loose condition locally occurring when the insulating mounting board 100 is connected with the circuit board 200, thereby being beneficial to improving the connection stability of the insulating mounting board 100 and the circuit board 200, and making the connection therebetween more compact.

In this embodiment, the connection post 160 may be made of a conductive material or an insulating material, the connection post 160 and the fourth through hole 240 may be fixedly connected by welding, the connection post 160 and the fourth through hole 240 may be fixedly connected by insulating glue, and the connection post 160 and the fourth through hole 240 may be fixedly connected by a threaded fastener and a threaded hole. As an alternative embodiment, the connection post 160 may be a tin pin, and the fourth conductive portion 251 is disposed on the fourth through hole 240, and the connection post 160 and the circuit board 200 are electrically connected through the fourth conductive portion 251. The structure of the fourth conductive portion 251 is the same as that of the first conductive portion 211, the second conductive portion 221 and the third conductive portion 231, and the connection manner of the connection post 160 and the circuit board 200 is also the same as that of the first bus bar terminal 130 and the circuit board 200, the connection manner of the second bus bar terminal 140 and the circuit board 200, and the connection manner of the sampling terminal 121 and the circuit board 200, which are not described herein.

In this embodiment, the surface of the connection post 160 is coated with the third insulating layer 161, the connection post 160 is protruded from the insulating mounting board 100, and the connection post 160 is protruded from the third insulating layer 161, so as to avoid affecting the connection between the connection post 160 and the fourth through hole 240.

In order to secure the connection stability of the circuit board 200 and to secure the flatness of the surface of the circuit board 200, the thickness of the third insulating layer 161 is the same as the thicknesses of the first, second and fifth insulating layers 180, 190 and 170. That is, the thickness of the third insulating layer 161 is equal to the thickness of the first insulating layer 180, the thickness of the third insulating layer 161 is equal to the thickness of the second insulating layer 190, and the thickness of the third insulating layer 161 is equal to the thickness of the fifth insulating layer 170.

In this embodiment, at least one limiting post 150 is further disposed on the insulating mounting board 100, the circuit board 200 is further provided with a fifth through hole 250, and the limiting post 150 is connected to the circuit board 200 through the fifth through hole 250. The efficiency of the assembly of the circuit board 200 to the insulative mounting board 100 is improved by defining the position of the circuit board assembly to the insulative mounting board 100 through the limit posts 150 and the fifth through holes 250. In this embodiment, there is no fixed connection between the limiting post 150 and the fifth through hole 250, and the limiting post 150 may pass through the fifth through hole 250, so that an assembly gap can be left, so that the assembly position is convenient to be properly adjusted, and the fifth through hole 250 is also not provided with a conductive portion, that is, the fifth through hole 250 has no conductivity. In this embodiment, the limiting post 150 is made of an insulating material, and the limiting post 150 may be made of the same material as the insulating mounting board 100.

As an alternative embodiment, two limiting posts 150 are disposed on the insulating mounting board 100 of the present embodiment, two fifth through holes 250 are correspondingly disposed on the circuit board 200, and the two fifth through holes 2500 may be circular holes, or one of the fifth through holes 250 may be a circular hole, and the other fifth through hole 250 may be a kidney-shaped hole, an oval-shaped hole, or a racetrack-shaped hole, so as to adjust the assembly position of the circuit board 200. The dimensions of the limiting post 150 and the fifth through hole 250 are not further limited in this embodiment, and may be adjusted according to practical situations by those skilled in the art.

In this embodiment, the surface of the spacing post 150 is coated with the fourth insulating layer 151, the spacing post 150 is protruded from the insulating mounting board 100, and the spacing post 150 is protruded from the fourth insulating layer 151, so as to avoid affecting the spacing effect of the spacing post 150.

In this embodiment, the thickness of the fourth insulating layer 151 may be the same as the thicknesses of the first insulating layer 180, the second insulating layer 190, the third insulating layer 161, and the fifth insulating layer 170, and the thickness of the fourth insulating layer 151 may be slightly greater than the thicknesses of the first insulating layer 180, the second insulating layer 190, the third insulating layer 161, and the fifth insulating layer 170. Preferably, the thickness of the fourth insulating layer 151 is the same as the thicknesses of the first, second, third, and fifth insulating layers 180, 190, 161, and 170.

If the thickness of the fourth insulating layer 151 is slightly greater than the thicknesses of the first insulating layer 180, the second insulating layer 190, the third insulating layer 161 and the fifth insulating layer 170, the thickness of the fourth insulating layer 151 is h4, and the thicknesses of the first insulating layer 180, the second insulating layer 190, the third insulating layer 161 and the fifth insulating layer 170 are h1, 0.05mm is less than or equal to h4-h1 is less than or equal to 0.2mm, so that the thickness of the fourth insulating layer 151 is slightly higher than the thicknesses of the other insulating layers, and therefore, the stress generated when the components (including the sampling terminal, the first bus terminal, the second bus terminal and the connecting post) on the other insulating layers are connected with the circuit board 200 can be avoided, the connection effect is affected, and the thickness difference between the fourth insulating layer 151 and the other insulating layers can be avoided, and the connection stability of the circuit board 200 and the surface flatness of the circuit board 200 are also avoided.

In this embodiment, the thickness difference between the fourth insulating layer 151 and the first insulating layer 180, the second insulating layer 190, the third insulating layer 161, and the fifth insulating layer 170 may be determined according to the processing accuracy, and for example, when each insulating layer is processed, if the processing accuracy is high, 0.05 mm.ltoreq.h4-h1.ltoreq.0.1 mm, and if the processing accuracy is low, 0.1 mm.ltoreq.h4-h1.ltoreq.0.2 mm.

In this embodiment, the materials of the insulating layers are not limited, and those skilled in the art can choose according to practical situations, for example, the insulating layers can be made of plastics or rubber, and the insulating layers can be made of the same materials as the insulating mounting board 100. The insulating layers may be integrally formed with the insulating mounting plate 100 or may be formed separately from the insulating mounting plate 100.

In this embodiment, a positioning hole may be further provided in the insulative mounting plate 100, and the insulative mounting plate 100 and the housing of the battery module may be assembled together through the positioning hole and a screw fastener or the like penetrating the positioning hole.

The following describes how the first bus terminal 130, the second bus terminal 140, and the sampling terminal 121 are electrically connected to the circuit board 200 in detail with reference to fig. 6:

as shown in fig. 6, if the connection post 160 is a tin foot, the fourth conductive portion 251 is disposed on the fourth through hole 240, and the connection post 160 and the circuit board 200 are electrically connected through the fourth conductive portion 251, in this embodiment, the bonding pad and the tin foot may be soldered by soldering, and when soldering, a low-melting metal solder (such as a tin-based alloy) is heated and melted, and then penetrates into and fills the gap between the bonding pad and the connection post 160 to form a fourth solder body, where the fourth solder body includes a solder body d, that is, the solder body d refers to the metal solder after solidification. As an alternative embodiment, the depth of the welding body d is 75% to 100% of the depth of the fourth through hole 240, and the area of the welding body d is 75% to 100% of the sum of the area of the conductive layer of the side edge of the fourth conductive part 251 facing away from the bus bar and the area of the fourth through hole 240, whereby the reliability of the welding connection of the fourth conductive part 251 and the connection post 160 on the fourth through hole 240 can be ensured.

Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the utility model.

Claims (24)

1. An electrical connection assembly comprising an insulating mounting plate, a bus bar, and a circuit board;

the bus bar is fixed on the insulating mounting plate and comprises a first conducting sheet and a second conducting sheet, a first bus bar end is arranged on the first conducting sheet, a second bus bar end is arranged on the second conducting sheet, the polarities of the first bus bar end and the second bus bar end are opposite, the first conducting sheet and the second conducting sheet are mutually insulated on the insulating mounting plate, the bus bar also comprises a third conducting sheet, a sampling end is arranged on the third conducting sheet,

the projection of the circuit board on the plane of the insulating mounting plate is overlapped with at least part of the area of the insulating mounting plate, a first through hole corresponding to the first bus bar end is arranged on the circuit board, a second through hole corresponding to the second bus bar end is arranged on the circuit board, a third through hole corresponding to the sampling end is arranged on the circuit board, the first bus bar end is electrically connected with the circuit board through the first through hole, the second bus bar end is electrically connected with the circuit board through the second through hole, a third sampling circuit is arranged on the circuit board, the sampling end is connected with the third sampling circuit through the third through hole,

The first conductive sheet and the second conductive sheet are disposed on an edge of the insulating mounting plate along a first direction.

2. The electrical connection assembly of claim 1, wherein the first and second conductive tabs are disposed on edges of opposite sides of the insulative mounting plate in a first direction, and the sampling terminal is disposed on edges of the insulative mounting plate in a second direction, the first and second directions being perpendicular to each other.

3. The electrical connection assembly of claim 1 or 2, wherein the circuit board further comprises a first sampling line and a second sampling line, the first bus terminal being electrically connected through the first via and the first sampling line, the second bus terminal being electrically connected through the second via and the second sampling line.

4. The electrical connection assembly of claim 1 or 2, wherein the cross-sectional area of the first bus bar end is greater than the cross-sectional area of the sampling bar end and the cross-sectional area of the second bus bar end is greater than the cross-sectional area of the sampling bar end.

5. The electrical connection assembly of claim 1 or 2, wherein the first conductive sheet includes a first fixed portion fixedly connected to the insulating mounting plate and a first connection portion connected to the circuit board, the first connection portion forming the first bus bar end, and the second conductive sheet includes a second fixed portion fixedly connected to the insulating mounting plate and a second connection portion connected to the circuit board.

6. The electrical connection assembly of claim 5, wherein the first connection portion is bent away from the insulative mounting plate to form the first bus bar end and the second connection portion is bent away from the insulative mounting plate to form the second bus bar end.

7. The electrical connection assembly of claim 1 or 2, wherein the first via is provided with a first conductive portion, the second via is provided with a second conductive portion, the first bus bar end and the circuit board are electrically connected through the first conductive portion, and the second bus bar end and the circuit board are electrically connected through the second conductive portion.

8. The electrical connection assembly of claim 7, wherein the first conductive portion comprises a first conductive layer disposed at an edge of a face of the first via facing away from the bus bar and a second conductive layer disposed at a wall of the first via;

and/or, the second conductive part comprises a fourth conductive layer and a fifth conductive layer, the fourth conductive layer is arranged at the edge of one surface of the second through hole, which is away from the busbar, and the fifth conductive layer is arranged on the hole wall of the second through hole.

9. The electrical connection assembly of claim 8, wherein the first conductive portion further comprises a third conductive layer disposed at an edge of the first via facing the bus bar side;

and/or, the second conductive part further comprises a sixth conductive layer, and the sixth conductive layer is arranged at the edge of the second through hole facing the surface of the busbar.

10. The electrical connection assembly of claim 8 or 9, wherein the first bus bar end is connected to the circuit board through the first via; the second bus terminal penetrates through the second through hole and is connected with the circuit board.

11. The electrical connection assembly of claim 10, wherein a first filler gap is provided between an outer peripheral surface of the first bus bar end and the second conductive layer, the first filler gap being filled with a first solder, the first bus bar end being connected to the circuit board by the first solder;

and/or a second filler gap is arranged between the outer peripheral surface of the second bus bar end and the fifth conductive layer, a second welding body is filled in the second filler gap, and the second bus bar end is connected with the circuit board through the second welding body;

The first welded body and the second welded body are formed by filler welding.

12. The electrical connection assembly of claim 9, wherein a difference between an outer diameter and an inner diameter of the first conductive layer is greater than a difference between an outer diameter and an inner diameter of the third conductive layer;

and/or, the difference between the outer diameter and the inner diameter of the fourth conductive layer is greater than the difference between the outer diameter and the inner diameter of the sixth conductive layer.

13. The electrical connection assembly of claim 5, wherein the first connection portion surface is coated with a first insulating layer and the second connection portion surface is coated with a second insulating layer.

14. The electrical connection assembly of claim 13, wherein the insulative mounting plate is further provided with a connection post and the circuit board is further provided with a fourth through-hole, the connection post being connected to the circuit board through the fourth through-hole.

15. The electrical connection assembly of claim 14, wherein the connection post surface is coated with a third insulating layer.

16. The electrical connection assembly of claim 15, wherein a thickness of the third insulating layer is equal to a thickness of the first insulating layer; the thickness of the third insulating layer is equal to the thickness of the second insulating layer.

17. The electrical connection assembly of claim 13, wherein the insulative mounting plate is further provided with a spacing post and the circuit board is further provided with a fifth through-hole, the spacing post being connected to the circuit board through the fifth through-hole.

18. The electrical connection assembly of claim 17, wherein the stopper post surface is coated with a fourth insulating layer.

19. The electrical connection assembly of claim 18, wherein a thickness of the fourth insulating layer is greater than or equal to a thickness of the first insulating layer; the thickness of the fourth insulating layer is greater than or equal to the thickness of the second insulating layer.

20. The electrical connection assembly of claim 19, wherein the fourth insulating layer has a thickness greater than the thickness of the first insulating layer, the fourth insulating layer has a thickness h4, and the first insulating layer has a thickness h1,0.05mm ∈h4_h1 ∈0.2mm;

and/or the thickness of the fourth insulating layer is greater than that of the second insulating layer, and the thickness of the second insulating layer is h2, wherein h4-h2 is more than or equal to 0.05mm and less than or equal to 0.2mm.

21. The electrical connection assembly of claim 2, wherein a plurality of third conductive strips are disposed on the insulating mounting plate, and grooves penetrating through the insulating mounting plate are formed between any two adjacent third conductive strips along the first direction and between the first conductive strip and the third conductive strip.

22. The electrical connection assembly of claim 21, wherein the third conductive tab defines a first notch along the first direction, the recess being disposed at the first notch.

23. The electrical connection assembly of claim 22, wherein the third conductive tab further defines a second notch along the first direction, the first notch being disposed opposite the second notch, and wherein the first notch is not coincident with or not fully coincident with the second notch along the second direction.

24. A battery module comprising a plurality of stacked cells and further comprising an electrical connection assembly according to any one of claims 1 to 23, said electrical connection assembly being connected to said cells.