CN111261810A

CN111261810A - Battery module

Info

Publication number: CN111261810A
Application number: CN201911020146.1A
Authority: CN
Inventors: 刘昌�
Original assignee: Hangzhou Qiandai Technology Co Ltd
Current assignee: Hangzhou Qiandai Technology Co Ltd
Priority date: 2019-09-20
Filing date: 2019-10-25
Publication date: 2020-06-09
Anticipated expiration: 2039-10-25
Also published as: CN111261810B

Abstract

The application discloses battery module includes: an end piece and an assembly unit; the assembly unit includes: the battery cell unit, the unit bracket, the middle gasket and the battery cell welding wire; the cell unit is arranged between the two cell supports, and the cell supports are provided with a plurality of support through holes at positions corresponding to the plurality of positioning grooves so that the end parts of the cell unit are exposed out of the cell supports; the middle gasket is provided with a plurality of gasket through holes at positions corresponding to the support through holes so that the end part of the battery cell unit is exposed out of the middle gasket, the middle gasket is provided with an inner welding wire groove sunken towards the inside of the middle gasket at the edge of the support through hole, one end of a battery cell welding wire is welded to the end part of the battery cell unit, and the other end of the battery cell welding wire penetrates through the support through hole and the gasket through holes to be welded to the middle gasket and is positioned in the inner welding wire groove. The beneficial effect of this application lies in providing one kind through welded structure and middle gasket's improvement thereby improve the battery module of electric core unit equilibrium.

Description

Battery module

Technical Field

The present application relates to a battery module, particularly, relates to a battery module.

Background

A "lithium battery" is a type of battery using a nonaqueous electrolyte solution with lithium metal or a lithium alloy as a negative electrode material. Lithium metal batteries were first proposed and studied by Gilbert n. Lewis in 1912. In the 70 s of the 20 th century, m.s.whittingham proposed and began to study lithium ion batteries. Because the chemical characteristics of lithium metal are very active, the requirements on the environment for processing, storing and using the lithium metal are very high. With the development of science and technology, lithium batteries have become the mainstream nowadays.

With the further development of science and technology, lithium batteries have become very important electric energy sources in the fields of new energy automobiles and the like, and a single battery cell is often packaged into a battery module and then is supplemented with a peripheral circuit to form a battery pack which can be used independently.

In the description of the related documents, the assembly of the battery module is often inconvenient and complicated for forming electrical connection with the battery cell.

If the battery module described in chinese patent document CN208093630U is configured to electrically connect the parallel cells in one series unit through the aluminum strip, and then connect the series units in series through the external electrical connection structure, such a connection manner may cause the cells connected in parallel in one series unit to be unbalanced, thereby causing a part of the cells to be deteriorated first, and affecting the life of the series unit, thereby reducing the utilization rate of the cells in a better state.

Disclosure of Invention

A battery module, comprising: the battery cell units are used for storing electric energy; a plurality of terminal members disposed at both ends of the battery module such that the battery module is constructed as a whole; the assembling units are arranged between the end parts so that the battery module can realize electric energy storage; the method is characterized in that: the assembly unit includes: the two unit supports are arranged at two ends of the battery cell units so that the battery cell units form a whole; the middle gasket is arranged on the outer side of the unit bracket and forms surface contact with the middle gasket of the adjacent assembly unit; a plurality of cell bonding wires electrically connecting the end portions of the cell units to the middle gasket; the cell unit is arranged between the two unit supports, the unit supports are provided with a plurality of positioning grooves, and two ends of the cell unit are embedded into the positioning grooves; the unit support is provided with a plurality of support through holes at positions corresponding to the positioning grooves so that the end parts of the electric core units are exposed out of the unit support; the middle gasket is provided with a plurality of gasket through holes at positions corresponding to the support through holes so that the end parts of the cell units are exposed out of the middle gasket, the middle gasket is provided with an inner welding wire groove which is sunken towards the inner part of the middle gasket at the edge of the support through hole, one end of one cell welding wire is welded to the end part of the cell unit, and the other end of the cell welding wire penetrates through the support through hole and the gasket through hole to be welded to the middle gasket and is positioned in the inner welding wire groove; the middle gasket is provided with a combination hole and a combination bulge; wherein the combination hole penetrates through the middle gasket; the combining bulge protrudes outwards to be inserted into the unit bracket after passing through the combining hole; the unit bracket is formed with a combination groove for accommodating the combination protrusion, and the bottom of the combination groove is formed with a limiting structure; the intermediate gasket comprises at least two or more metal elements and is formed by pressing powders of the two metal elements.

Further, the battery cell units are substantially revolved bodies, and the battery cell units are all arranged in parallel.

Furthermore, the support through hole is a circular hole, and the circle center of the support through hole is located on the rotation axis of the battery cell unit.

Further, the gasket through holes are circular holes concentric with the bracket through holes.

Further, the end face of the middle gasket located on the outer side is aligned with or located on the inner side of the end face of the unit bracket.

Furthermore, a plurality of outer welding wire grooves which are sunken towards the inside of the middle gasket are arranged at the edge of the middle gasket; and routing notches are formed in the edges of the unit supports corresponding to the positions of the outer welding wire grooves.

Furthermore, the end face of the unit bracket is provided with a placement groove, and the middle gasket is embedded in the placement groove.

Further, the inner wire groove is located on one side of the gasket through hole, and the shape of the inner wire groove is mirror-symmetrical relative to a symmetry axis.

Further, the inner wire grooves are all arranged at the same relative position of the gasket through holes.

Further, the middle pad includes: a main body portion that constitutes a panel structure substantially in a direction perpendicular to the cell units; the through hole part is turned over towards the inside of the support to form the gasket through hole; the combining projection includes: a limiting part passing through the gasket through hole so that the combining protrusion can be limited by the through hole part; a connecting portion at least partially disposed in the gasket through hole to connect the main body portion and the connecting portion; the size of the limiting part in the direction parallel to the main body part plate surface structure is larger than or equal to the size of the gasket through hole in the direction parallel to the main body part plate surface structure; the through-hole portion is partially received in the unit bracket.

The application has the advantages that:

provided is a battery module in which cell unit balance is improved by improving a welding structure and a middle gasket.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:

fig. 1 is a schematic structural view of a battery module according to an embodiment of the present application;

fig. 2 is a schematic structural view of an assembly unit of the battery module in the embodiment shown in fig. 1;

fig. 3 is a partial exploded view of an assembled unit of the battery module in the embodiment of fig. 1;

fig. 4 is a further exploded view of an assembled unit of the battery module in the embodiment of fig. 1;

FIG. 5 is an outboard configuration of the center pad of the embodiment of FIG. 1;

FIG. 6 is an enlarged view of a portion of FIG. 5;

FIG. 7 is a schematic view of the inner side of the middle pad in the embodiment of FIG. 1;

fig. 8 is a cross-sectional view of a section of the battery module in the embodiment shown in fig. 1;

FIG. 9 is an enlarged view of a portion of the structure shown in FIG. 8;

fig. 10 is a cross-sectional view of another section of the battery module in the embodiment shown in fig. 1;

FIG. 11 is an enlarged view of a portion of the assembly unit shown in FIG. 2;

FIG. 12 is an enlarged view of another portion of the assembly shown in FIG. 10;

fig. 13 is a schematic structural view of a battery module according to another embodiment of the present application;

fig. 14 is a case assembly of a battery pack that can be mated with the battery module shown in fig. 13;

fig. 15 is a schematic structural view of the assembled battery module shown in fig. 13 and the case assembly shown in fig. 14;

FIG. 16 is a schematic view showing the joining of an aluminum powder ingot and a copper powder ingot in the production method of the present application;

fig. 17 is a photograph showing crystal phases of a raw material plate manufactured according to an embodiment of the manufacturing method of the present application.

Detailed Description

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 to 9, the battery module 200 of the present application includes: two end pieces 201 and several assembly units 202.

Wherein two end members 201 are provided at both ends of the battery module 200 such that the battery module 200 is constructed as a whole. The two end pieces 201 may be formed with snap 217 structures on their peripheries so that they can be quickly made into connection.

The assembly unit 202 is provided between the terminal members 201 to enable the battery module 200 to realize a power reserve. The number of assembly units 202 assembled between the two end pieces 201 can be determined according to specific requirements.

Specifically, the assembly unit 202 includes: a plurality of cell units 203, two unit brackets 204 and two middle gaskets 205. The assembly unit 202 also includes a number of cell wire bonds 206.

The cell unit 203 is configured to store electric energy, and as a specific option, a 18650 standard cell may be selected as the cell unit 203.

The two unit supports 204 are arranged oppositely, and are mainly used for fixing the cell units 203, and the two unit supports 204 form a matching structure and enable the cell units 203 and the cell units between the cell units to form an assembled whole.

As a point of improvement, the middle pad 205 is mainly used to realize the series electrical connection between the different assembly units 202, so that the different assembly units 202 can be combined into a whole and can also form a balanced electrical connection. Also, the cell bonding wire 206 electrically connects the end of the cell unit 203 to the middle spacer 205.

Specifically, the intermediate gasket 205 is provided outside the unit bracket 204 and in surface contact with the intermediate gasket 205 of the adjacent assembly unit 202; the cell unit 203 is arranged between the two cell supports 204, the cell supports 204 are provided with a plurality of positioning grooves 207, and two ends of the cell unit 203 are embedded in the positioning grooves 207; the unit bracket 204 is provided with a plurality of bracket through holes 208 at positions corresponding to the plurality of positioning grooves 207 so that the end parts of the cell units 203 are exposed out of the unit bracket 204; the middle gasket 205 is provided with a plurality of gasket through holes 209 at positions corresponding to the bracket through holes 208, so that the end portions of the cell units 203 are exposed out of the middle gasket 205, the middle gasket 205 is provided with an inner wire groove 210 recessed towards the inside of the middle gasket 205 at the edge of the gasket through hole 209, one end of a cell bonding wire 206 is welded to the end portion of the cell unit 203, and the other end of the cell bonding wire passes through the bracket through hole 208 and the gasket through hole 209 to be welded to the middle gasket 205 and is located in the inner wire groove 210.

It should be noted that the cell bonding wires 206 may be bonded to the ends of the cell units 203 and the middle spacer 205 by using an aluminum wire bonding process.

In this way, the cells of the same assembly unit 202 are connected in parallel by the cell bonding wires 206 and the middle gaskets 205, and the different assembly units 202 are connected in series by the contact of the middle gaskets 205, and since the middle gaskets 205 cover the regions of all the cell units 203 and are electrically connected by the surface contact, all the cell units 203 are balanced in the specific charging and discharging process, thereby improving the conventional defects.

Specifically, the cell units 203 are substantially a revolution body, such as a cylinder, and all the cell units 203 are arranged in parallel, where the parallel refers to that the axes of revolution of the cell units 203 are parallel. As a further preferable scheme, the support through hole 208 is a circular hole and the center of the circular hole is located on the rotation axis of the cell unit 203, and similarly, the gasket through hole 209 is a circular hole and the center of the circular hole is also located on the rotation axis of the cell unit 203, that is, the gasket through hole 209 is a circular hole concentric with the support through hole 208.

As a further specific solution, the inner wire groove 210 is located on the side of the pad through hole 209, and its shape constitutes mirror symmetry with respect to one axis of symmetry. The inner wire grooves 210 are all disposed at the same relative position of the pad through hole 209.

When the pad through-hole 209 is a circular hole, the inner wire groove 210 is symmetrical with respect to one diameter of the pad through-hole 209 and is located on one side of a line on which the other diameter perpendicular to the one diameter is located.

As a further concrete measure, the end face of the middle spacer 205 located on the outer side is aligned with the end face of the cell holder 204 or located on the inner side of the end face of the cell holder 204. This prevents the cell bonding wires 206 from protruding beyond the end surfaces of the unit bracket 204.

In order to facilitate detection, a plurality of outer welding wire grooves 211 which are sunken towards the inside of the middle gasket 205 are formed in the edge of the middle gasket 205; the edge of the unit bracket 204 is provided with a routing notch 212 at a position corresponding to the outer wire groove 211. This allows the required electrical signal to be obtained through the lead 218 soldered within the outer solder wire groove 211.

As a further specific solution, the end surface of the unit bracket 204 is provided with a seating groove 213, and the middle spacer 205 is embedded in the seating groove 213. Further, as one of the solutions, the unit bracket 204 is provided with a bracket mounting hole 220, the intermediate gasket 205 is at least partially embedded in the bracket mounting hole 220 and forms an internally threaded hole, and then the intermediate gasket 205 is mounted at the end face of the unit bracket 204 by the mounting screw 219 screwed into the internally threaded hole. It should be noted that, when the assembly unit 102 is docked, the center spacer 205 or the unit bracket 104 is docked to receive the nut of the mounting screw 219, so as to form a hole structure 232 or space for receiving the nut.

As an extension, when the end part 201 is mounted to the assembly unit 202, the end part 201 and the middle gasket 205 and the unit bracket 203 may be sequentially connected using the end bolts 229. To accommodate the engagement projection 222, the end piece 201 forms an end space 230 that accommodates the engagement projection 222.

Specifically, the middle pad 205 is formed with a coupling structure for mating with another middle pad 205.

Specifically, the middle pad 205 is formed with a coupling hole 221 and a coupling protrusion 222; wherein, the combining hole 221 penetrates the middle gasket 205; the coupling protrusion 222 protrudes outward to be inserted into the unit bracket 204 after passing through the coupling hole 221; the unit bracket 204 is formed with coupling grooves 223 receiving the coupling protrusions 222, and the bottoms of the coupling grooves 223 are formed with limit structures 224.

Specifically, the intermediate gasket 205 includes a main body portion 225 and a through hole portion 226.

The main body 225 constitutes a plate structure in a direction substantially perpendicular to the cell units, and the main body 225 is mainly used for forming a portion where the intermediate gaskets 205 contact each other. The through hole portion 226 is folded back toward the inside of the holder to form the coupling hole 221, and the through hole portion 226 mainly forms a space through which the coupling protrusion 222 passes. In order to ensure the structural strength, when the coupling hole 221 is formed, a through hole is formed at a punching position and the periphery thereof is folded back in the punching direction to form the through hole portion 226, instead of using a blank punching.

As a further specific aspect, the combining projection 222 includes: a stopper 227 and a connecting portion 228. Wherein, the position-limiting part 227 passes through the combining hole 221 so that the combining protrusion 222 can be limited by the through hole part 226.

The connection portion 228 is at least partially disposed in the coupling hole 221 to connect the body portion 225 and the connection portion 228; the dimension of the limiting part 227 in the direction parallel to the plate surface structure of the main body part 225 is greater than or equal to the dimension of the combining hole 221 in the direction parallel to the plate surface structure of the main body part 225; the through hole portion 226 is partially received in the unit bracket 204.

The dimension of the direction parallel to the plate surface structure of the main body portion 225 may be approximately the size of the aperture of the coupling hole 221.

The limit part 227 is formed at the end of the combining protrusion 222, and the limit part 227 is against the limit structure 224 formed at the bottom of the combining groove 223 of the unit bracket 204, so as to limit the combining protrusion 222 from being further inserted into the unit bracket 204, and at the same time, since the size of the limit part 227 itself is larger than that of the gasket through hole, the limit part 227 prevents the combining protrusion 222 from being withdrawn from the combining groove 223 of the unit bracket 204, thereby realizing the combination between different unit brackets 204 by inserting the combining protrusion 222 into the combining groove 223.

As an alternative, before the combination of the combination protrusion 222, the size of the portion for forming the position-limiting portion 227 and the connecting portion 228 is similar, and both the portions can pass through the gasket through hole, when the two assembly units 202 are combined, the end portion of the combination protrusion 222 is inserted into the combination hole 221, and at this time, by the size design, the main body portion 225 of the middle gasket 205 is not yet contacted, and the two assembly units 202 need to be further approached, at this time, the end portion of the combination protrusion 222 is pressed by the position-limiting structure 224 to be deformed, so that the size of the end portion is increased, and when the two assembly units 202 are combined, the size of the end portion of the combination protrusion 222 is larger than that of the combination hole 221, so as to realize the position-limiting structure.

In an embodiment, the intermediate spacer 205 has several positioning pins 231 formed on the inner side, which can be inserted into corresponding hole structures formed in the unit carrier 204.

Fig. 9 shows another embodiment of a battery module 101 ', which is different from the previously described solution in that the end piece 301 of the battery module 101 ' is formed with two parallel snap-in grooves 105 ', and the extending direction of the snap-in grooves 105 ' is perpendicular to the axial direction of the cell unit 106 '.

Fig. 10 and 11 show a case assembly capable of constituting a battery pack 100 ' including a case 103 ' and a snap block 104 ' fixedly mounted therein. The case 103 ' is used for accommodating the battery module 101 ', and the clamping block 104 ' is used for being inserted into the clamping groove 105 ' to position the battery module 101 '.

When the battery pack 100 ' is assembled (the end caps are not shown), the clamping blocks 104 ' are aligned with the clamping grooves 105 ' and are inserted into the clamping grooves, so that the battery module 101 ' can be mounted inside the case 103 ' without using bolts or welding.

The clamping blocks 104 'are arranged on two opposite sides inside the box body 103'. The case 103' may be substantially configured as a rectangular body.

As an extension, the clip groove 105 'or the clip block 104' may be configured with a slope such that they are more and more tightly combined as the insertion progresses when they are butted.

It should be noted that, in order to achieve a good electrical connection, the material and process of the middle pad need to be implemented as follows.

Specifically, the intermediate gasket includes at least two or more metal elements, and is formed by pressing powders of the two metal elements, and the metal elements include two metal elements, namely copper and aluminum.

As another aspect of the present application, the present application includes a method of manufacturing comprising:

the manufacturing method comprises the following steps:

manufacturing a unit bracket to enable the unit bracket to be provided with a plurality of positioning grooves, a combination groove and a buckle, wherein the positioning grooves are arranged on one side of the unit bracket, the combination groove is arranged on the other side of the unit bracket, and a limiting structure is formed at the bottom of the combination groove;

manufacturing a middle gasket to enable the middle gasket to be provided with a plurality of gasket through holes, inner welding wire grooves formed at the edges of the gasket through holes, combination holes and combination bulges, wherein the combination bulges are protruded outwards;

fixedly mounting the middle gasket to the outer side of the unit bracket;

arranging a plurality of battery cell units between the two unit supports in a parallel mode, and combining the two unit supports into a whole through a buckle;

welding two ends of a cell welding wire to the end part of the cell unit and the inner welding wire groove respectively, and enabling the cell welding wire to penetrate through the bracket through hole and the gasket through hole;

the combining bulge of one assembling unit is inserted into the combining groove of the other assembling unit, so that the combining bulge forms a limiting part which is larger than the combining hole into which the combining bulge is inserted after contacting the limiting structure.

More specifically, it should be noted that, in order to achieve good electrical connection and structural strength of the bonding bumps, the material and process of the intermediate pad need to be implemented as follows.

Specifically, the intermediate gasket includes at least two or more metal elements and is formed by pressing powders of the two metal elements, and the metal elements include two kinds, copper and aluminum, respectively, as one of the proposals.

Specifically, the intermediate gasket is formed by processing a copper-aluminum composite sheet raw material through the working procedures of punching, slotting and the like.

And form a composite sheet of the raw material of the intermediate gasket (which may be referred to as a metal sheet, and which is not intended to limit the scope of the present application).

The composite sheet constituting the intermediate gasket may be prepared by a method comprising the steps of:

aluminum powder of the quality A is subjected to a first ingot casting process to form an aluminum powder ingot of a roughly flat plate shape;

forming a copper powder ingot with a roughly flat plate shape by using the aluminum powder with the mass B through a second ingot casting process;

carrying out grooving treatment on the aluminum powder ingots so as to form a plurality of aluminum ingot grooves on the joint surface of the aluminum powder ingots;

carrying out a grooving treatment on the copper powder ingot to form a plurality of copper ingot grooves on the joint surface of the copper powder ingot;

and combining the aluminum powder ingot and the copper powder ingot which pass through the planing groove in a mode that the combined surfaces are opposite, and then performing pulse pressing to obtain the raw material plate.

The specific proposal is that the ratio of A to B is 0.4 to 0.66.

As a specific embodiment, a specific method of forming a composite sheet of an intermediate gasket includes:

step 11: obtaining aluminum powder;

step 12: stirring the aluminum powder, wherein the value range of the stirring speed is 0.5-2 r/s; the stirring time is in the range of 4 to 6 minutes, and the ambient temperature during stirring is in the range of 20 to 30 ℃.

Step 13: screening aluminum powder, wherein negative pressure is adopted to perform negative pressure suction on the screening side during screening, and the value range of the negative pressure is minus 15 to minus 25 MPa; the screen mesh number ranges from 80 to 120 meshes.

Step 14: carrying out a first ingot casting process on the aluminum powder, wherein the first ingot casting process specifically comprises the following steps: aluminum powder is arranged in a heating type mould melting furnace to be heated, and the value range of the heating temperature is 300-800 ℃; while heating, applying ingot casting pressure by using an extruder, wherein the value range of the ingot casting pressure is 150-250 kilonewtons (kN); under the double actions of heating and pressing, the aluminum powder is die-cast into a platy aluminum powder ingot with the thickness ranging from 0.5 to 1.0 mm;

step 15: carrying out linear grooving treatment on the joint surface of the aluminum powder ingot, wherein the groove depth ranges from 0.15 mm to 0.2 mm, and the included angle between the grooving direction and the plate surface ranges from 50 degrees to 70 degrees; the straightness of the planing groove needs to be less than or equal to 0.05 mm/cm.

Step 22: obtaining copper powder;

step 23: stirring the copper powder, wherein the value range of the stirring speed is 0.5-2 r/s; the stirring time is in the range of 4 to 6 minutes, and the ambient temperature during stirring is in the range of 20 to 30 ℃.

Step 24: screening copper powder, wherein negative pressure is adopted to perform negative pressure suction on the screened side during screening, and the value range of the negative pressure is negative 15 to negative 25 MPa; the screen mesh number ranges from 80 to 120 meshes.

Step 25: carrying out a first ingot casting process on the copper powder, wherein the first ingot casting process specifically comprises the following steps: arranging copper powder in a heating type mould melting furnace, and heating, wherein the value range of the heating temperature is 300-800 ℃; while heating, applying ingot casting pressure by using an extruder, wherein the value range of the ingot casting pressure is 150-250 kilonewtons (kN); under the double actions of heating and pressing, die-casting the copper powder into a plate-shaped copper powder ingot with the thickness ranging from 0.5 to 1.0 mm;

step 26: carrying out linear grooving treatment on the joint surface of the copper powder ingot, wherein the groove depth ranges from 0.15 mm to 0.2 mm, and the included angle between the grooving direction and the plate surface ranges from 50 degrees to 70 degrees; the straightness of the planing groove needs to be less than or equal to 0.05 mm/cm.

Step 31: as shown in fig. 16 (in fig. 16, 10 is an aluminum powder ingot, and 20 is a copper powder ingot), the aluminum powder ingot and the copper powder ingot which pass through the planing groove are butted together in a manner that the joint surfaces are opposite to each other, and then are pressed by pressing equipment with a vibration function, specifically, when the pressing equipment is pressed, pressing is performed in a forging manner, that is, pressure is periodically applied and removed, and as a specific scheme, the pressing equipment can be realized by a combination of a hydraulic press and a vibration table.

When the pressing is carried out, the value range of the pressure is 400-600 kilonewtons (kN), and the value range of the vibration amplitude is 4-7 mm; the value range of the vibration frequency is 60 to 80 Hz; the vibration acceleration value range is 6-8 g.

The press time ranges from 12 to 20 minutes.

In order to improve the performance of the material, staged pressing can be carried out, the thickness of the composite board ranges from 1mm to 1.5mm after the first pressing, and the composite board is further thinned by the second pressing so as to obtain the final thickness of the composite board, wherein the thickness ranges from 0.8 mm to 1.2 mm.

After the steps, the raw material plate of the middle gasket is formed.

Alternatively, the prepared raw material sheet needs to be subjected to X-ray inspection to check whether the sheet has defects such as cracks.

If the raw material plate has no problem, the raw material plate needs to be cleaned, and antirust oil or alcohol and the like can be adopted to clean the raw material plate.

After cleaning, the raw material plate is machined to form the intermediate gasket of the present application.

As a specific scheme, the preparation method of the raw material plate specifically comprises the following steps:

step 1: obtaining aluminum powder;

step 2: stirring the aluminum powder, wherein the stirring speed is 1 r/s; stirring for 5 minutes, and the value of the ambient temperature during stirring is 25 ℃.

And step 3: screening aluminum powder, wherein negative pressure is adopted to perform negative pressure suction on one screening side during screening, and the value of negative pressure intensity is minus 20 MPa; the mesh number of the screen is 100 meshes.

And 4, step 4: carrying out a first ingot casting process on the aluminum powder, wherein the first ingot casting process specifically comprises the following steps: aluminum powder is arranged in a heating type mould melting furnace to be heated, and the heating temperature is 400 ℃; while heating, applying ingot casting pressure by using an extruder, wherein the value of the ingot casting pressure is 200 kilonewtons (kN); under the double actions of heating and pressing, the aluminum powder is die-cast into a plate-shaped aluminum powder ingot with the thickness of 0.7 mm;

and 5: carrying out linear grooving treatment on the joint surface of the aluminum powder ingot, wherein the groove depth is 0.18 mm, and the included angle between the grooving direction and the plate surface is 60 degrees; the straightness of the planing groove needs to be less than or equal to 0.05 mm/cm.

Step 6: obtaining copper powder;

and 7: stirring the copper powder, wherein the stirring speed is 1 r/s; stirring for 5 minutes, and the value of the ambient temperature during stirring is 25 ℃.

And 8: screening copper powder, wherein negative pressure is adopted to perform negative pressure suction on the screened side during screening, and the value of the negative pressure is minus 20 MPa; the mesh number of the screen is 100 meshes.

And step 9: carrying out a first ingot casting process on the copper powder, wherein the first ingot casting process specifically comprises the following steps: arranging copper powder in a heating type mould melting furnace, and heating at the temperature of 400 ℃; while heating, applying ingot casting pressure by using an extruder, wherein the value of the ingot casting pressure is 200 kilonewtons (kN); under the double actions of heating and pressing, die-casting the copper powder into a plate-shaped copper powder ingot with the thickness of 0.7 mm;

step 10: carrying out linear grooving treatment on the joint surface of the copper powder ingot, wherein the groove depth is 0.18 mm, and the included angle between the grooving direction and the plate surface is 60 degrees; the straightness of the planing groove needs to be less than or equal to 0.05 mm/cm.

Step 11: the aluminum powder ingots and the copper powder ingots which pass through the planing grooves are butted together in a mode that joint surfaces are opposite, then pressing is carried out through pressing equipment with a vibration effect, specifically, when the pressing equipment is used for pressing, pressing is carried out in a forging mode, namely, pressure is periodically applied and removed, and as a specific scheme, the pressing equipment can be realized by combining a hydraulic machine and a vibration table.

When the pressing is carried out, the value of the pressure is 500 kilonewtons (kN), and the value of the vibration amplitude is 57 mm; the value of the vibration frequency is 75 Hz; the vibration acceleration takes 7 g.

The press-fit time was 15 minutes.

Wherein the mass ratio of the aluminum powder to the copper powder is 3: 7.

in order to improve the performance of the material, staged pressing can be carried out, the thickness of the composite board is 1.2mm after the first pressing, and the composite board is further thinned by the second pressing so as to obtain the final thickness of the composite board, wherein the thickness is 1 mm.

The cross-sectional photograph of the raw material plate thus prepared is shown in fig. 14, and the bonding interface between aluminum and copper is a complicated broken line, so that cracks are hard to propagate. Even under the use condition of long-term vibration, the parts are not easy to break.

The manufacturing method of the present application further includes:

punching raw material plates to obtain the through holes of the through holes and the gasket through holes

Punching the raw material plate to form an inner welding wire groove and an outer welding wire groove;

the raw material plate is processed to form the bonding protrusions.

By adopting the preparation method, the middle gasket can effectively conduct current and has enough structural strength.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery module, comprising:

the battery cell units are used for storing electric energy;

a plurality of terminal members disposed at both ends of the battery module such that the battery module is constructed as a whole;

the assembling units are arranged between the end parts so that the battery module can realize electric energy storage;

the method is characterized in that:

the assembly unit includes:

the two unit supports are arranged at two ends of the battery cell units so that the battery cell units form a whole;

the middle gasket is arranged on the outer side of the unit bracket and forms surface contact with the middle gasket of the adjacent assembly unit;

a plurality of cell bonding wires electrically connecting the end portions of the cell units to the middle gasket;

the cell unit is arranged between the two unit supports, the unit supports are provided with a plurality of positioning grooves, and two ends of the cell unit are embedded into the positioning grooves; the unit support is provided with a plurality of support through holes at positions corresponding to the positioning grooves so that the end parts of the electric core units are exposed out of the unit support; the middle gasket is provided with a plurality of gasket through holes at positions corresponding to the support through holes so that the end parts of the cell units are exposed out of the middle gasket, the middle gasket is provided with an inner welding wire groove which is sunken towards the inner part of the middle gasket at the edge of the support through hole, one end of one cell welding wire is welded to the end part of the cell unit, and the other end of the cell welding wire penetrates through the support through hole and the gasket through hole to be welded to the middle gasket and is positioned in the inner welding wire groove;

the middle gasket is provided with a combination hole and a combination bulge; wherein the combination hole penetrates through the middle gasket; the combining bulge protrudes outwards to be inserted into the unit bracket after passing through the combining hole;

the unit bracket is formed with a combination groove for accommodating the combination protrusion, and the bottom of the combination groove is formed with a limiting structure;

the intermediate gasket contains at least two metal elements and is formed by pressing powders of the two metal elements.

2. The battery module according to claim 1, wherein:

the battery cell units are substantially revolved bodies and are all arranged in parallel.

3. The battery module according to claim 2, wherein:

the support through hole is a circular hole, and the circle center of the support through hole is located on the rotating axis of the battery cell unit.

4. The battery module according to claim 3, wherein:

the gasket through holes are circular holes concentric with the support through holes.

5. The battery module according to claim 1, wherein:

the end face of the middle gasket located at the outer side is aligned with the end face of the unit bracket or located at the inner side of the end face of the unit bracket.

6. The battery module according to claim 5, wherein:

the edge of the middle gasket is provided with a plurality of outer welding wire grooves which are sunken towards the inside of the middle gasket; and routing notches are formed in the edges of the unit supports corresponding to the positions of the outer welding wire grooves.

7. The battery module according to claim 6, wherein:

the end face of the unit support is provided with a placement groove, and the middle gasket is embedded into the placement groove.

8. The battery module according to claim 1, wherein:

the inner welding wire groove is positioned on one side of the gasket through hole, and the shape of the inner welding wire groove is mirror symmetry relative to a symmetry axis.

9. The battery module according to claim 8, wherein:

the inner welding wire grooves are all arranged at the same relative position of the gasket through holes.

10. The battery module according to claim 1, wherein:

the middle gasket includes:

a main body portion that constitutes a panel structure substantially in a direction perpendicular to the cell units;

the through hole part is turned over towards the inside of the support to form the gasket through hole;

the combining projection includes:

a limiting part passing through the gasket through hole so that the combining protrusion can be limited by the through hole part;

a connecting portion at least partially disposed in the gasket through hole to connect the main body portion and the connecting portion;

the size of the limiting part in the direction parallel to the main body part plate surface structure is larger than or equal to the size of the gasket through hole in the direction parallel to the main body part plate surface structure;

the through-hole portion is partially received in the unit bracket.