WO2018059143A1

WO2018059143A1 - Battery module and new energy vehicle

Info

Publication number: WO2018059143A1
Application number: PCT/CN2017/097345
Authority: WO
Inventors: 赵文鹏; 方杰
Original assignee: 蔚来汽车有限公司
Priority date: 2016-09-29
Filing date: 2017-08-14
Publication date: 2018-04-05
Also published as: CN106803608A

Abstract

A battery module and a new energy vehicle. The battery module comprises a frame structure and a plurality of battery cells disposed therein. Each of the battery cells comprises a single-cell battery (11), a heat sink plate (12), and a thermal insulation plate (13). The single-cell battery (11) comprises a positive electrode (113) and a negative electrode (111) at at least one terminal of the single-cell battery (11). The single-cell battery (11) is disposed at one side of the heat sink plate (12) to enable the heat sink plate (12) to conduct heat of the battery cell. The thermal insulation plate (13) is disposed at the other side of the heat sink plate (12) to prevent heat conduction between adjacent single-cell batteries (11) in the battery cell. The battery module has high thermal conduction efficiency and higher battery module cooling and heating efficiency.

Description

Battery modules and new energy vehicles

Technical field

The present application relates to the field of power batteries, and in particular to a battery module.

The present application also relates to the field of new energy vehicles, and in particular to a new energy vehicle provided with the above battery module.

Background technique

At present, the power battery module, especially the flexible packaging power battery module, has a complicated structure, is difficult to assemble, and has a high cost and low production efficiency due to the fixing manner of a plurality of bolts. The design is not universal and the module cannot be expanded. In addition, in order to ensure the high-power charge and discharge, the battery core needs to be able to transfer heat to the heat exchange interface in a timely and efficient manner, and at the same time, in order to avoid the thermal influence between the battery in the case of abuse of the module or the destruction of a single battery core, In addition, thermal isolation is required. In order to meet the above requirements, it is necessary to develop a simple assembly, high production efficiency, a universal design, and an excellent module design with high heat conduction efficiency and good thermal insulation between cells.

Summary of the invention

The technical problem to be solved by the present application is to provide a battery module which is improved in design, integration and production compared to the current battery module.

The present invention relates to a battery module including a frame structure in which a plurality of battery cells are arranged in a row, and each of the battery cells includes a single cell, a heat conducting sheet and a heat insulating sheet. The unit cell has a positive electrode tab and a negative electrode tab on at least one end, one side of the heat conducting sheet is provided with the unit cell to conduct heat of the cell, and the other side of the heat conducting sheet is provided with the partition The heat sheets are used to avoid heat transfer between the individual cells of adjacent cell units.

Optionally, in the above battery module, the battery module further includes at least one wire harness plate disposed near the position where the positive and negative ear are located to receive the plurality of the series or parallel arrangement The positive and negative ear of the cell unit, the harness plate further pre-integrating a jumper piece connecting the positive and negative ear of the plurality of cell units and an output end as the output of the plurality of cell units .

Optionally, in the above battery module, the harness plate has a first surface facing the plurality of battery cells and a second surface facing away from the first surface, the second surface having a connection end of the positive and negative ear electrodes of the single cell, the pre-integrated bridge and the output end respectively connected to the connection end And wherein the jumper spans an area of the connection end to which a number of poles of the cell unit are connected.

Optionally, in the above battery module, the heat insulating sheet is provided with a first buckle fixing structure connected to the wire harness plate on at least one tab end of the battery cell unit; A second snap fixing structure connected to the heat conducting sheet is disposed on the other end of the ear.

Optionally, in the above battery module, the frame structure includes a baffle, the baffle is provided with an insulating box, and the outer portion of the harness plate is provided with a separating plate, and the insulating box and the separating plate are A sampling plate pre-integrated in the insulating box is disposed for monitoring the working state of the battery module.

Optionally, in the above battery module, the frame structure includes side plates disposed on both sides in the left-right direction with respect to the plurality of battery cells, and two in the front-rear direction with respect to the plurality of battery cells a baffle on the end, an upper cover and a strap at the bottom of the plurality of battery cells, wherein the side plate and the baffle are welded, and the side plate and the upper cover are welded Connected, the side plate and the strap are connected by welding.

Optionally, in the above battery module, at least one of the baffles and the battery unit are provided with a heat insulation board.

Optionally, in the above battery module, the heat conducting sheet is further provided with a flange as a heat transfer surface, and a certain number of notches are disposed on the outer side of the flange, and the battery module further includes no more than A strap of a number of notches, the strap traversing the cell unit and embedded in a recess of the flange of the thermally conductive sheet of each of the cell units and connected to the frame structure.

Optionally, in the above battery module, the positive electrode and the negative electrode of the single cell have the same material.

Optionally, in the above battery module, the positive electrode ear of the single cell has a first material, the negative electrode has a second material, and the surface of the positive or negative ear is further covered with a turnover surface. The turnover surface is a thin layer of the second material on the surface of the positive electrode or a thin layer of the first material on the surface of the negative electrode.

Optionally, in the above battery module, one of the positive electrode and the negative electrode of the single cell is a composite plate having a first material and a second material, and the composite material is purely first material A portion is encapsulated inside the single cell, a portion of the pure second material of the composite sheet acts as a tab lead, and the other of the positive and negative ears has a second material.

This application has the following technical effects:

1) The heat transfer efficiency of the battery core is high, and the module cooling and heating efficiency are high. The present application uses a separate thermally conductive sheet that can transfer the heat of each cell separately. In a cell unit, there is only one cell, a heat conducting sheet and a heat insulating sheet, so that the heat of the individual cells can be transferred through the heat conducting sheet.

2) The heat insulation between the batteries is good, effectively avoiding the heat diffusion caused by abuse or bad. When a plurality of cell units form a cell unit group, it is found that a heat insulating sheet is disposed between the cell cells of each two adjacent cell units, thereby avoiding heat between the cell cells. diffusion. Therefore, the present application can effectively transfer the heat of each cell, and can also isolate the heat of each cell, thereby greatly improving the heat transfer efficiency. In the present application, the heat of the battery core can be transmitted to the bottom of the battery module through the bottom flange of the heat conductive sheet. In order to further improve the heat transfer efficiency, the straps at the bottom of the battery module and the flange of the heat conductive sheet have corresponding designs. . The designed strap is embedded in the flange of the heat transfer sheet so that the flange as the heat transfer surface can be directly exchanged heat with the additional cold plate.

3) This application can facilitate the grouping of cells in series and parallel, and has versatility. When the cell units are arranged in series in a certain manner, arranged side by side or integrated in series and in parallel, the cell unit can be easily integrated through the wire harness plate. The jumper plate and the output end are pre-integrated on the harness board, and the tabs of each cell unit are connected according to the design correspondingly, and the electrical connection is realized through the jumper piece and the output end. Because of the presence of the harness plate, various arrangements can be made for the cell unit within the battery module.

4) This application can be processed in the battery core to facilitate the welding of the positive and negative ear. The application can ensure the electrochemical potential, and can make the positive and negative electrodes of the battery core have the same material to facilitate welding. That is, a surface of a tab is coated with a layer of soldering surface which is a thin layer of material different from the material of the tab. Alternatively, a tab is made into a composite sheet, a pure material portion is encapsulated inside the cell, and another pure material portion is used as the lead end, and the other tab material is the same as the lead end. This facilitates the welding of the positive and negative ear.

5) The application has the advantages of simple structure, convenient assembly, high reliability and convenient mass production. In the original battery module, the connection between the components is fixed by bolts, and the components in the battery module of the present application are replaced by bolts or soldering, wherein the snap connection is detachable. Connection, welding can be laser welded. Therefore, whether it is the internal connection of the cell unit, the connection of the frame structure, or the connection of the cell unit group and the wiring harness board, etc., can be conveniently realized.

The present application also relates to a new energy vehicle provided with the above battery module, and thus has the technical effect as described above.

Other aspects and features of the present application will become apparent from the following detailed description. It should be understood, however, that the drawings are intended for purposes of illustration only and are not intended to It is also to be understood that the drawings are not intended to

DRAWINGS

The present application will be more fully understood from the following detailed description of the embodiments of the invention. among them:

1a-1b are schematic structural views of the assembled battery module of the present application, wherein FIG. 1a is a side perspective view showing the upper cover, and FIG. 1b can be seen a side perspective view of the bottom strap;

2 is an exploded view showing the structure of a battery module according to the present application;

3a is a schematic view showing the mounting of components of the battery module according to the present application at the end (front end or rear end);

3b-3d are schematic structural views of a baffle, an insulating case, and a spacer of the battery module according to the present application;

4a is a schematic structural view showing the installation of a harness panel and a battery cell unit of the battery module according to the present application;

4b-4c are schematic structural views of the first side and the second side of the wire harness plate of the battery module according to the present application;

Figure 5 is a schematic view showing the structure of the wire harness board of Figure 4a-4c after being mounted to the battery module;

6a-6b are schematic structural views showing the composition of a cell unit of a battery module according to the present application;

7a-7c are structural schematic views of a single cell, a heat conducting sheet and a heat insulating sheet in a battery cell unit of a battery module according to the present application.

detailed description

To enable those skilled in the art to understand the subject matter of the present application, the specific embodiments of the present application are described in detail below.

1a-1b, a perspective view of a battery module according to the present application, FIG. 1a shows the top of the battery module, and FIG. 1b shows the bottom of the battery module. 2 is an exploded view of the battery module. As can be seen from the above figures, the battery module has a frame structure, which may be an all-metal frame, including an upper cover 1, two left and right side panels 2, two front and rear baffles 3, and a plurality of straps 4 at the bottom. . The upper cover 1 is connected to the two side plates 2, the two baffles 3 are respectively connected to the two side plates 2, and the plurality of straps 4 are connected to the two side plates 2. These connections can be achieved by welding such as laser welding or arc welding to achieve the integration of the above components, so that the entire frame structure has a reliable welding strength. Inside the frame structure is a row of neatly arranged cell units, each of which is composed of a single cell 11, a thermally conductive sheet 12 and a heat insulating sheet 13. These cell units are The chip units are present and arranged in series or in parallel depending on the design. The specific structure of the cell unit and the electrical connection between them will be described in detail below. The two side plates 2 clamp the arranged battery cells, and in order to prevent heat from being transmitted from the unit cells 11 through the side plates 2, a heat insulating plate 10 is further disposed between the unit cells 11 and the side plates 2 ( See Figure 2).

The unit cell 11 has positive and negative ears on at least one end thereof. When the unit cell 11, the heat conducting sheet 12 and the heat insulating sheet 13 constitute the cell unit, the two tabs are extended. These tabs are received on the harness plate 7, and the number of harness plates 7 depends on the setting of the tabs. When a pair of tabs of the unit cell 11 are on one end, a harness plate 7 is disposed on the end; when the positive electrode of the unit cell 11 is on the front end and the negative electrode is on the rear end, the two ends A wire harness plate 7 is separately provided, that is, two wire harness plates 7 are shared. The tabs can pass through the harness plate 7 and be bent, and then electrically connected to the connection end (described below) on the harness plate 7 by welding, such as laser welding. The pre-integrated jumper 8 and the output end 9 are in the harness plate 7, wherein the jumper 8 electrically connects the

tabs

113, 111 of the plurality of cell units, and the so-called output terminal 9 serves as a plurality of cell units. Unified output. Therefore, for the design of only one harness plate 7, it is necessary to provide two positive and negative output terminals 9 on the same harness plate 7. For the two harness plates 7, it may be an arrangement of one output end 9 of the harness plate 7.

The wiring harness plate 7 is covered with a separating plate 6 for electrical insulation treatment to isolate the high voltage. The sampling board 15 (sampling PCB board) is previously integrated in an insulating case 5, and the insulating case 5 is fixed to the insulating board 6. The sampling board 15 is a PCB board through which the internal working state of the battery module can be known, and a sampling harness and a communication harness are provided thereon. The baffle 3 is fastened on the outside of the insulating case 5, and the two bent sides are overlapped at both ends of the left and right side plates 2, and the connection is completed by the aforementioned laser welding or argon arc welding. In addition, a certain number of straps 4 are used at the bottom of the battery module and welded to the corresponding positions of the left and right side panels 2. Finally, the wire harness on the sampling plate 15 is turned on, and the protective cover 14 is fastened to form a complete battery module as shown in the figure.

Figure 3a shows an exploded view of the front end (or back end) of the battery module. 3b-3d show schematic views of the structure of the baffle 3, the insulating case 5, and the partitioning plate 6, respectively. A positioning hole 31 is provided in the main body of the baffle 3 to be connected to the insulating case 5. A mounting hole 32 and a bent side are provided on both sides of the baffle 3, and the bent side is used for welding with the end of the side plate 2 to form a frame structure. After the frame structure is welded, the mounting hole 32 can serve as a mounting fixing point of the battery module.

The top of the insulating box 5 is provided with an outlet port 51 for the sampling board, which facilitates the entry and exit of the sampling harness and the communication harness of the sampling board. The left and right sides of the insulating box 5 are provided with mounting holes 52 to be separated from the inside. Connected to the board 6. A positioning pin 53 corresponding to the baffle 3 is provided on the main body of the insulating case 5 to position the component. A boss 54 is further provided on the main body of the insulating case 5 to position the shutter 3 and the insulating case 5, and the baffle 3 can be restricted from moving upward.

The isolation plate 6 isolates the high voltage tab of the inner cell unit from the external sampling plate to provide electrical insulation. Mounting holes 61 corresponding to the mounting holes 52 of the insulating case 5 on the left and right sides of the separating plate 6 are provided with mounting holes 61 which are fitted and fixed with the mounting holes 52. The edges of the spacer panel 6 are also provided with snaps 62 near the four corners for locking with the bayonet 74 of the harness panel 7 which will be mentioned later. A port 63 is also provided on one edge of the partitioning plate 6, and the port 63 is used to lead out the output merged output end 9 of the inner cell unit, and a protective cover (not shown) is attached to the port 63. Press to press the output end 9.

Referring to Figure 4a, a schematic view of the harness plate 7 and the cell unit to be connected is shown. Figures 4b-4c show the first face 77 of the harness plate 7 facing the cell unit and the second face 78 facing the spacer plate 6, respectively. The harness plate 7 is formed of a plastic part of high structural strength and high dielectric strength. The second end 78 is injection molded or inlaid with a connecting end 71. The connecting end 71 is made of a highly conductive metal such as copper or pure aluminum for soldering to the positive and

negative electrodes

113 and 111 of the single cell 11. The row beam plate 7 is further disposed with a row of via holes 75 corresponding to the

tabs

113, 111 of each of the cell units. When the

tabs

113, 111 pass through the via holes 75 from the first face 77 to the second face 78, The connecting end 71 is bent and welded to the connecting end 71, such as laser welding. At the top end of the wire harness 7, an outlet port 72 is provided, through which the sample harness representing the voltage at the connection end 71, the jumper piece 8, and the output terminal 9 can be drawn out. The output port 73 is located on the same side of the outlet port 72, and the common output of the cell unit, the output terminal 9, is externally connected via the output port 73 on the harness plate 7. The harness plate 7 is provided with a bayonet 74 at a position corresponding to the buckle 62 of the partitioning plate 6, and can be engaged with the snap 62 so that the partitioning plate 6 is fixed to the bobbin plate 7. The first face 77 of the wire harness plate 7 has a plurality of protruding snaps 76. As can be seen from the figure, the snaps 76 are in groups of two and correspond to the number of battery cells, which are used in the cell unit. The heat insulating sheet 13 is fitted to facilitate the mounting and fixing of the wire harness plate 7.

Returning to FIG. 4a, after the cell units are arranged in series and in parallel in a certain manner, the positive electrode 113 and the negative electrode 111 of the single cell 11 in each cell unit are from the via 75 of the corresponding harness plate 7. In the middle, according to the serial connection, it is required to be bent to the connecting end 71 of the harness plate 7, respectively, and then laser welding is performed to electrically connect the positive electrode 113 and the negative electrode 111 of the single cell 11 with the connecting end 71 of the harness plate 7. connection. When the positive and

negative electrodes

113, 111 of the unit cell 11 are disposed at both ends, two harness plates are respectively disposed on the front and rear ends of the cell unit. When the positive and

negative electrodes

113, 111 of the single cell 11 are arranged at one end, there is A harness plate 7 is connected to the

tabs

113, 111. At this time, the through hole 75 of the harness plate 7 is designed according to the actual condition of the tab.

Prior to assembly of the harness plate 7, the jumper piece 8 and the output end 9 are previously welded to the connection end 71 of the second face 78 of the wire harness plate 7 or to a corresponding position. The jumper 8 spans the area of the connection end 71 where the plurality of tabs are located for electrical connection between the cell units. Output 9 is the total output of the cell unit output. Fig. 5 shows the structure after the harness plate 7 is mounted in place.

In addition, it is conceivable that in the case where the positive and

negative electrodes

113, 111 of the single cell 11 are disposed at both ends, not only the wire harness plate 7 is two, but also the spacer 6, the sampling plate 15, and the insulating case 5 should be Both are numbered and arranged on the front and rear ends of the battery module.

Next, referring to Figures 6a-6b, which are exploded views of the cell unit, Figures 7a-c are schematic views of the components of the cell unit. A battery module has a plurality of battery cells arranged in series and parallel and arranged in a row to form a battery pack. Each of the cell units includes at least a single cell 11, a thermally conductive sheet 12, and a heat insulating sheet 13. As can be seen from Figures 6a-6b, the thermally conductive sheet 12 is located between the unit cell 11 and the insulating sheet 13. One side of the heat conductive sheet 12 is a single cell 11 and the other side is a heat insulating sheet 13. The heat conductive sheet 12 is formed by punching a high thermal conductive metal sheet such as copper or pure aluminum. The heat insulating sheet 13 is made of a heat insulating fireproof material. The large surface of the unit cell 11 is bonded to the heat conductive sheet 12, and in order to secure a sufficient heat conduction contact area, a heat conductive paste may be applied between the unit cell 11 and the heat conductive sheet 12. The other side of the heat transfer sheet 12 is fixedly connected to the heat insulating sheet 13. In a combination of a group of arranged cell units, the cell 11 of the next cell unit is attached to the insulating sheet 13 of the previous cell unit. This means that the heat of each of the individual cells 11 can only be conducted through the conductive sheets 12 in contact with the set of cells, and since there is inevitably a gap between the thermally conductive sheets 12 of the adjacent cells. The heat sheet 13 avoids heat transfer between the different unit cells 11 due to the heat insulating property of the heat insulating sheet 13, thereby effectively avoiding heat diffusion between the unit cells 11 of adjacent battery cells.

Referring to FIG. 7a, the positive and

negative electrodes

113 and 111 of the single cell 11 are respectively taken as two ends of the single cell 11, the positive electrode 113 is made of the first material, and the negative electrode 111 is made of the second material. Both the second material and the second material are used to ensure electrochemical potential and avoid electrochemical corrosion. However, the welding difficulty of dissimilar metals is greatly increased. To this end, at least one first material foil is provided on the surface of one of the tabs, for example, on the surface of the negative electrode tab 111 as the welding revolution surface 112, so that the negative electrode tab 111 can be made the same as the material of the positive electrode tab 113 when soldered. Or, make one of the tabs into a composite board, For example, the negative electrode tab 111 is formed as a composite material sheet having a first material and a second material, wherein a pure second material portion of the composite material sheet is encapsulated inside the single cell 11 and a pure first material portion is the negative electrode 111 The lead end, and the positive electrode tab 113 is a pure first material; or the positive electrode tab 113 is formed as a composite material sheet having a first material and a second material, wherein the pure first material portion of the composite material sheet is encapsulated in the single cell 11 The inner portion of the pure second material is the leading end of the positive electrode tab 113, and the negative electrode tab 111 is the pure second material.

When the positive electrode 113 of the single cell 11 is made of pure aluminum material and the negative electrode 111 is made of pure copper material, a thin aluminum foil may be welded on the surface of the negative electrode 111, for example, ultrasonic welding as the welding turnover surface 112, or The copper-aluminum composite plate is used as the negative electrode tab 111, wherein the pure copper portion is encapsulated inside the single cell 11 and the pure aluminum portion is used as the leading end of the negative electrode 111, so that the negative electrode 111 and the positive electrode 113 are the same pure aluminum material. It can facilitate laser welding.

Alternatively, as a non-power type battery module, a thin copper foil may be ultrasonically welded on the surface of the positive electrode tab 113 as a transfer surface/welding surface 112, or a copper-aluminum composite plate may be used as the positive electrode 113. The pure aluminum portion is encapsulated inside the single cell 11 and the pure copper portion serves as the lead end of the positive electrode 113. Thus, the negative electrode 111 and the positive electrode 113 are of the same pure copper material, which facilitates brazing.

A schematic structural view of the thermal conductive sheet 12 is shown in Fig. 7b. The thermal conductive sheet 12 is formed by machining a high thermal conductivity metal plate such as pure copper or pure aluminum. One end of the heat conductive sheet 12 is provided with a bayonet 121 for connecting to the heat insulating sheet 13. The large surface 125 of the thermally conductive sheet 12 serves as a heat transfer surface in contact with the large surface of the unit cell 11. The bottom of the heat conducting sheet 12 is bent into a flange 124 to serve as a heat transfer surface for heat transfer of the heat conducting sheet 12 downward. After the battery module is assembled, a cold plate is placed at the bottom to contact the flange 124 of the heat conductive sheet 12 to thereby perform heat exchange. A series of reinforcing ribs 122 are stamped on the flange 124 to ensure the overall rigidity of the heat conducting sheet 12, while a plurality of notches 123 are also punched on the flange 124, and at most the straps 4 corresponding to the number of the recesses 123 are along These notches 123 traverse the cell unit group and are soldered to the side plates 2 on both sides. Due to the action of the recess 123, the strap 4 can be embedded in the recess 123 such that the flange 124 as a heat transfer surface does not interfere with the strap 4.

Fig. 7c is a schematic view showing the structure of the heat insulating sheet 13. The heat insulating sheet 13 is made of a heat-insulating fireproof material, and may be made of materials such as PI, PA, PE, POM, and mica. The large face 132 of the heat insulating sheet 13 serves as a separating surface to prevent heat transfer between the unit cells 11. One end of the heat insulating sheet 13 is provided with a buckle 131 to be fixed to the bayonet 121 on the heat conductive sheet 12. The other end of the heat insulating sheet 13 is provided with bayonet 133, and the bayonet 133 is interlocked with the buckle 76 on the harness panel 7 previously described, so that the harness panel 7 is fixed to the battery unit, thereby improving Assembly efficiency of the battery module. It should be understood that when the harness plate 7 is mounted on the front and rear ends of the battery unit, the bayonet 133 of the heat insulating sheet 13 should also be symmetrically disposed on both ends. The bayonet 133 - snap 76 connection here is a practical and reliable connection scheme. 6b, the bayonet 133 can be bent into a U-shape at right angles, and the buckle 76 is cylindrical, with a circumferential groove therebetween. When the buckle 76 penetrates the bayonet 133, the bayonet 133 is confined in the circumferential groove. To complete the connection. This connection is easy to implement and reliable, and can be removed for reuse. The

bayonet

133, 121 may be formed on both ends of the heat insulating sheet 13 (as shown in FIG. 7c) to be connected to the harness plate 7, or formed on one end of the heat conductive sheet 12 (as shown in FIG. 7b) to be insulated The slice 13 is connected. The

buckles

131, 76 may be formed on one end of the heat insulating sheet 13 (as shown in Fig. 7c) to be connected to the heat conductive sheet 12, or formed on the first surface 77 of the wire harness plate 7 (as shown in Fig. 4b).

After the unit cell 11, the heat conducting sheet 12, and the heat insulating sheet 13 constitute the cell unit, the plurality of cell units can be arranged in series and parallel. In the battery module shown in FIGS. 4a and 5, the positive and

negative electrodes

113 and 111 are separately arranged at both ends of the single cell 11, and the battery module has 12 battery cells, each of which has The same poles of the four battery cells are arranged at the same end. The four battery cells are connected in parallel and form a battery cell group. Therefore, the battery module has a first battery cell group and a second battery. a core unit group and a third battery unit group. Then, the three groups of battery cells are connected in series, that is, the first electrode unit group and the same electrode of the second battery unit group are not at the same end, and the same electrode of the second battery unit group and the third battery unit group are not in the same end. The same end. For example, in conjunction with FIG. 4a, what will be seen from the right is the positive electrode of the first cell unit group, the negative electrode of the second cell unit group, and the positive electrode of the third cell unit group. On the harness plate 7 shown in the drawing, the pre-integrated jumper piece 8 spans the position of the first cell unit group, the second cell unit group, that is, a total of eight cell units, and is invisible. On the other end of the harness plate 7, the pre-integrated jumper 8 will span the position of the second cell unit group, the third cell unit group, that is, a total of eight cell units. At the same time, the diagonal position of the wire bundle 7 relative to the jumper 8 is pre-integrated with the output 9 of the entire battery module. Alternatively, it is conceivable that another pre-integrated jumper piece can also be used at this position, ie in the harness plate 7 as shown, the second jumper piece spans the third cell unit group, ie four The area of the connection end 71 covered by the positive electrode tab 113 of the cell unit, on the harness plate at the other end which is not visible, the second jumper traverses the negative pole of the first cell unit group, that is, the four cell units The second jumper is connected to each output end in the region of the connection end 71 covered by the ear 111. In the harness plate 7 as shown, the output 9 is the positive output, and at the opposite end of the harness plate (not shown, but imaginable), the output is the negative output.

It is conceivable that the cell unit can be arranged in other arrangements according to the design requirements, and the electrical connection portion, structure of the harness plate 7, and the arrangement of the pre-connecting jumper 8 and the output terminal 9 are correspondingly changed. . The arrangement of the cell units of the battery module of the present application is not limited to the above.

When the harness plate 7 is fixed to the 12 battery cells, an electrically insulating spacer 6 can be attached to the wire bundle 7, and the output terminal 9 is led out from the port 63. The sampling plate 15 is first mounted on the inner side of the insulating case 5, and the insulating case 5 is fixed to the insulating plate 6. Then, the baffle 3 is attached to the outermost surface, and the baffle 3 is welded to the two side plates 2. The strap 4 is passed through from the bottom and welded to the side panel 2, whereby the frame structure is formed. Finally, the sampling harness is turned on, and the output protective cover 14 is buckled on the isolation plate 6 to complete the assembly of the battery module.

For convenience of introduction, the term "side", "side plate", "lateral" and the like referred to in the present application refer to the left and right (or lateral) direction of the battery module shown in the drawings, and the "end" The terminology of "end", "front end", "back end" and the like refers to the front and rear (or axial) direction of the battery module. In addition, the "top", "bottom" and other azimuth terms refer to the up and down direction of the battery module. However, the above-described directions or orientation terms are only used for convenience of description, and those skilled in the art can conceive that the description of the battery module may not be limited to the above-described direction or orientation term. These directions or orientation terms can vary in three dimensions.

While the embodiments of the present invention have been shown and described in detail, the embodiments of the invention

Claims

A battery module comprising a frame structure, wherein the frame structure is arranged with a plurality of cell units, wherein each cell unit comprises a single cell (11), a thermal pad (12) and a heat insulating sheet (13) having a positive electrode tab (113) and a negative electrode tab (111) on at least one end, one side of the heat conducting sheet (12) is provided with the single sheet The body cell (11) conducts heat of the cell, and the other side of the heat conducting sheet (12) is provided with the heat insulating sheet (13) for avoiding the single cell (11) adjacent to the cell unit. The heat transfer between.
The battery module according to claim 1, wherein said battery module further comprises at least one wire harness plate (7), said wire harness plate (7) being disposed at said positive and negative ear (113, 111) In the vicinity of the location to receive the positive and negative ears (113, 111) of the plurality of cell units arranged in series or in parallel, the wire harness plate (7) is also pre-integrated to connect the plurality of cells A jumper (8) of the positive and negative ears (113, 111) of the unit and an output (9) as the output of the plurality of battery cells.
The battery module according to claim 2, wherein said harness plate (7) has a first face (77) facing said plurality of cell units and a face facing away from said first face (77) a second side (78) having a connection end (71) for electrically connecting the positive and negative electrodes (113, 111) of the single cell (11), pre-integrated The jumper piece (8) and the output end (9) are respectively connected to the connecting end (71), wherein the jumper piece (8) spans a certain number of poles of the cell unit (113, 111) The area of the connected end (71) to which it is connected.
The battery module according to claim 2, wherein said heat insulating sheet (13) is provided with a first connection to said harness plate (7) on at least one of the tab ends of said cell unit a snap-fastening structure; the heat insulating sheet (13) is provided on the other pole end with a second snap fixing structure connected to the heat conducting sheet (12).
The battery module according to claim 2, wherein the frame structure comprises a baffle (3), and the baffle (3) is provided with an insulating box (5), and the wire harness plate (7) An isolation plate (6) is disposed outside, and a sampling plate pre-integrated in the insulation box (5) is disposed between the insulation box (5) and the insulation plate (6) for monitoring the battery The working state of the module.
A battery module according to claim 1, wherein said frame structure comprises side plates (2) arranged on both sides in the left-right direction with respect to said plurality of cell units, with respect to said plurality of electric charges a core unit is disposed at a baffle (3) on both ends in the front-rear direction, an upper cover (1), and a strap (4) at a bottom of the plurality of battery cells, the side plate (2) and the baffle (3) is a welded joint between the side plate (2) and the upper cover (1), and a welded connection between the side plate (2) and the strap (4) .
A battery module according to claim 6, wherein at least one of said baffles (3) and said cell unit are provided with a heat shield (10).
The battery module according to claim 1, wherein the heat conducting sheet (12) is further provided with a flange (124) as a heat transfer surface, and a certain number of the flanges (124) are provided on the outer side. a recess (123), the battery module further comprising a strap (4) not exceeding the number of recesses (123), the strap (4) traversing the battery unit and embedded in each The recess (123) of the flange (124) of the heat conducting sheet (12) of the cell unit is connected to and connected to the frame structure.
The battery module according to claim 1, wherein the positive electrode tab (113) of the single cell (11) has the same material as the negative electrode tab (111).
The battery module according to claim 9, wherein the positive electrode tab (113) of the single cell (11) has a first material, and the negative electrode tab (111) has a second material at the positive electrode. The surface of the ear (113) or the negative electrode (111) is further covered with a turnover surface (112), which is a thin layer or layer of the second material on the surface of the positive electrode (113). A thin layer of the first material on the surface of the negative electrode tab (111).
The battery module according to claim 9, wherein one of the positive electrode tab (113) and the negative electrode tab (111) of the single cell (11) has a first material and a second material. a composite panel having a portion of the pure first material of the composite panel encapsulated within the interior of the unitary cell (11), the portion of the pure second material of the composite panel being the tab terminal, the positive tab The other of (113) and the negative electrode ear (111) has a second material.
A new energy vehicle characterized by comprising the battery module according to any one of claims 1-11.