CN218242090U - Battery cell, power battery and vehicle - Google Patents

Abstract

The application discloses electric core, power battery and vehicle, wherein, electric core includes electric core body, first electrode terminal, second electrode terminal, first connection piece and second connection piece. The battery cell body comprises a first surface, a second surface and a third surface, wherein the first surface and the second surface are arranged in a reverse manner, and the third surface is used for connecting the first surface and the second surface; the third surface is provided with a first groove and a second groove; the first electrode terminal is fixedly connected with the first surface, and the second electrode terminal is fixedly connected with the second surface; the first connecting piece is fixedly connected with the first electrode terminal and is partially positioned in the first groove, and the second connecting piece is fixedly connected with the second electrode terminal and is partially positioned in the second groove. Also be about to first electrode terminal and second electrode terminal conversion to the third face to in the direct integrated scheme to the battery package of blade electricity core, no matter be short frame tray or high frame tray, all can be convenient for the electric core series connection welding form power battery.

Description

Battery cell, power battery and vehicle

Technical Field

The application relates to the technical field of batteries, in particular to an electric core, a power battery and a vehicle.

Background

At present, the positive and negative poles of the blade electric core of the power battery are respectively distributed on two sides of the electric core. Therefore, in the scheme of directly integrating the blade battery cells into the battery pack, the electrodes of the battery cells are opposite to the frame of the tray, that is, the electrodes of the battery cells are shielded by the frame of the tray. Therefore, only when the frame height of the tray is short, the electrode of the battery cell can be smoothly welded with the connecting sheet. If the frame height of tray is higher, then the electrode is difficult with the connection piece welding for the degree of difficulty of welding the piece increases.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide an electricity core, power battery and vehicle, the connection piece setting that will connect adjacent battery is in one side of electricity core body to welding degree of difficulty when reducing the electrode series connection of a plurality of electric cores.

This application first aspect provides an electricity core, includes: the battery cell comprises a battery cell body, a first electrode terminal, a second electrode terminal, a first connecting sheet and a second connecting sheet; the battery cell body comprises a first surface, a second surface and a third surface, wherein the first surface and the second surface are arranged in a reverse manner, and the third surface is used for connecting the first surface and the second surface; the battery cell body is provided with a first groove and a second groove, and the first groove is formed by sinking the third surface and penetrating through the first surface; the second groove is formed by sinking the third surface and penetrating through the second surface; either one of the first electrode terminal and the second electrode terminal is a positive electrode, and the other one is a negative electrode; the first electrode terminal is fixedly connected with the first surface, and the second electrode terminal is fixedly connected with the second surface; the first connecting piece comprises a first connecting section and a first welding section which are fixedly connected; the second connecting piece comprises a second connecting section and a second welding section which are fixedly connected; the first connecting section is fixedly connected with the first electrode terminal, and the first welding section is positioned in the first groove; the second connecting section is fixedly connected with the second electrode terminal, and the second welding section is positioned in the second groove.

In some embodiments, the cell body includes an outer casing, a first cover plate, and a second cover plate, where the outer casing includes a first side and a second side opposite to each other, and includes a mounting surface located between the first side and the second side; the mounting surface is provided with a first concave part and a second concave part, the first concave part is connected with the first side, and the second concave part is connected with the second side; the outer shell is provided with an injection chamber, a first opening and a second opening which are communicated with the injection chamber; the first opening is positioned on the first side and the first concave part, and the second opening is positioned on the second side and the second concave part; the first cover plate is fixedly connected with the outer shell and seals the first opening; one surface of the first cover plate, which is far away from the first side, is a first surface, and a first groove is formed between one surface of the first cover plate, which is far away from the first concave part, and the outer shell; one surface of the second cover plate, which is far away from the second side, is a second surface, and a second groove is formed between one surface of the second cover plate, which is far away from the second concave part, and the outer shell; the mounting surface is a third surface.

In some embodiments, the cell further comprises a first lead-out sheet, a first insulating member, and a second insulating member; the first lead-out piece and the first insulating piece are positioned in the injection cavity, and the second insulating piece is positioned outside the injection cavity; the first leading-out sheet, the first insulating piece, the first cover plate, the second insulating piece and the first connecting sheet are sequentially stacked; one end of the first electrode terminal is positioned in the injection cavity and fixedly connected with the first lead-out sheet; the other end of the first electrode terminal penetrates through the first insulating part, the first cover plate and the second insulating part in sequence and is fixedly connected with the first connecting section.

In some embodiments, the cell further comprises a third insulator; the third insulating part is fixedly connected to one side of the first connecting section, which deviates from the battery cell body.

In some embodiments, the second insulating member is provided with a third groove, the first connecting section and the third insulating member are both located in the third groove, and a surface of the third insulating member facing away from the cell body is flush with a surface of the second insulating member facing away from the cell body.

In some embodiments, the cell further comprises a first sealing ring; the first sealing ring is sleeved on the first electrode terminal; the first sealing ring is positioned between the first cover plate and the first insulating part, and at least part of the first sealing ring penetrates through the first cover plate so as to isolate the first electrode terminal from the first cover plate.

In some embodiments, the battery cell further includes a second lead-out sheet, a fourth insulating member, and a fifth insulating member; the second leading-out sheet and the fourth insulating piece are positioned in the injection cavity, and the fifth insulating piece is positioned outside the injection cavity; the second lead-out piece, the fourth insulating piece, the second cover plate, the fifth insulating piece and the second connecting piece are sequentially stacked; one end of the second electrode terminal is positioned in the injection cavity and is fixedly connected with the second lead-out sheet; the other end of the second electrode terminal penetrates through the fourth insulating part, the second cover plate and the fifth insulating part in sequence and is fixedly connected with the second connecting section.

In some embodiments, the cell further comprises a sixth insulator; and the sixth insulating part is fixedly connected to one side of the second connecting section, which deviates from the battery cell body.

In some embodiments, the fifth insulating member is provided with a fourth groove, the second connecting section and the sixth insulating member are both located in the fourth groove, and a surface of the sixth insulating member facing away from the cell body is flush with a surface of the fifth insulating member facing away from the cell body.

In some embodiments, the cell further comprises a second sealing ring; the second sealing ring is sleeved on the second electrode terminal, is positioned between the second cover plate and the fourth insulating part, and at least part of the second sealing ring penetrates through the second cover plate so as to isolate the second electrode terminal from the second cover plate.

A second aspect of the present application provides a power battery, including a plurality of electric cores of any one of the first aspects of the present application, a tray, and a plurality of welding sheets; the tray comprises an accommodating cavity and an opening communicated with the accommodating cavity; the battery cells are arranged in the accommodating cavity in parallel, a first surface of any battery cell and an adjacent second surface of the battery cell are arranged on the same side, and a third surface of the battery cell faces the opening; the first welding section of any battery cell is connected with the second welding section of the adjacent battery cell through a welding sheet, so that the battery cells are sequentially connected in series.

In some embodiments, the power battery further includes a cold liquid plate, the cold liquid plate is connected to the tray and covers the opening, and the cold liquid plate covers at least the first welding section and/or the second welding section of the battery core.

The third aspect of the present application provides a vehicle, comprising a motor controller and the power battery of any one of the second aspects of the present application, wherein the motor controller is electrically connected with the power battery.

The application provides an electric core, the position of connecing of connecting the electrode terminal of electric core both sides through the connection piece is changed and is lain in electric core same one side, consequently, when establishing ties to a plurality of electric cores, especially in the direct integrated scheme of battery package of blade electric core, can be with connection piece one side towards tray opening one side to no matter be short frame tray or high frame tray, all can be convenient for electric core series welding and form power battery.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings used in the embodiments will be briefly described below.

Fig. 1 is a schematic structural diagram of a battery cell provided in an embodiment of the present application.

Fig. 2 is a schematic view of a split structure of the battery cell shown in fig. 1.

Fig. 3 is a schematic structural view of the cell body shown in fig. 2.

Fig. 4 is a schematic view of another split structure of the battery cell shown in fig. 1.

Fig. 5 is a partially enlarged view of fig. 1.

Fig. 6 is a schematic structural diagram of a power battery provided in an embodiment of the present application.

Description of the reference numerals: 1000-cell, 100-cell body, 101-first face, 102-second face, 103-third face, 104-first groove, 105-second groove, 110-outer housing, 111-first opening, 112-second opening, 113-injection chamber, 114-first side, 115-second side, 116-first recess, 117-second recess, 120-first cover plate, 121-first plate, 122-second plate, 123-third plate, 130-second cover plate, 200-first electrode terminal, 210-second electrode terminal, 300-first connection piece, 301-first connection section, 302-first welding section, 310-second connection piece, 311-a second connecting section, 312-a second welding section, 400-a first lead-out sheet, 401-a first mounting hole, 410-a second lead-out sheet, 411-a second mounting hole, 500-a first insulating part, 510-a second insulating part, 511-a third groove, 520-a third insulating part, 530-a fourth insulating part, 540-a fifth insulating part, 541-a fourth groove, 550-a sixth insulating part, 600-a first sealing ring, 610-a second sealing ring, 2000-a power battery, 2100-a tray, 2101-a bottom plate, 2102-a frame, 2103-a cross beam, 2104-a longitudinal beam, 2200-a welding sheet, 2300-a cold liquid plate and 2400-a distribution box.

Detailed Description

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.

Referring to fig. 1 and fig. 2, an electrical core 1000 provided in an embodiment of the present application includes: the battery cell comprises a battery cell body 100, a first electrode terminal 200, a second electrode terminal 210, a first connecting sheet 300 and a second connecting sheet 310. The battery cell body 100 comprises a first surface 101, a second surface 102 and a third surface 103, wherein the first surface 101 and the second surface 102 are arranged in an opposite manner, and the third surface is connected with the first surface 101 and the second surface 102; the battery cell body 100 is provided with a first groove 104 and a second groove 105, and the first groove 104 is formed by recessing the third surface 103 and penetrating through the first surface 101. The second groove 105 is recessed for the third surface 103 and is formed through the second surface 102.

It is understood that the cell 1000 is a blade cell 1000 and has a rectangular and thin sheet shape. That is, the battery cell body 100 is a rectangular sheet, the first surface 101 is perpendicular to the third surface 103, and the second surface 102 is perpendicular to the third surface 103. In other embodiments, the first surface 101 and the third surface 103 may be obliquely disposed, and the second surface 102 and the third surface 103 may be obliquely disposed. In other embodiments, the battery cell 1000 has a square shape or a rectangular shape with a certain thickness. It can also be understood that the third surface 103 and the first surface 101 are located on different sides of the cell body 100, and the third surface 103 and the second surface 102 are located on different sides of the cell body 100.

Either one of the first electrode terminal 200 and the second electrode terminal 210 is a positive electrode, and the other is a negative electrode; the first electrode terminal 200 is fixedly connected to the first surface 101, and the second electrode terminal 210 is fixedly connected to the second surface 102.

The first connecting piece 300 comprises a fixedly connected first connecting section 301 and a first welding section 302. The second connecting piece 310 includes a second connecting section 311 and a second welding section 312 which are fixedly connected. The first connection section 301 is fixedly connected to the first electrode terminal 200, and the first welding section 302 is positioned in the first groove 104; the second connection section 311 is fixedly connected to the second electrode terminal 210, and the second welding section 312 is located in the second groove 105.

It will be appreciated that the first connecting piece 300 is L-shaped with a 90 degree angle between the first connecting section 301 and the first welding section 302. The second connecting piece 310 is L-shaped, and the second connecting section 311 and the second welding section 312 form an included angle of 90 degrees. The first groove 104 and the second groove 105 are both rectangular grooves.

It may be understood by those skilled in the art that the number of the first electrode terminal 200 and the second electrode terminal 210 may each be plural. Specifically, in the embodiment of the present application, the number of the first electrode terminals 200 and the second electrode terminals 210 is 3. Of course, those skilled in the art may also set the number of the first electrode terminals 200 and the second electrode terminals 210 to be 2, 4, or 5, etc. according to actual needs, and specifically, the embodiment of the present application is not limited.

In the embodiment of the present application, the first electrode terminal 200 located on the first face 101 is fixedly connected through the first connection section 301 of the first connection piece 300, and the first welding section 302 is located in the first groove 104 of the third face 103, and it can be understood by those skilled in the art that the first connection piece 300 is a conductor, and thus, the position of electrically connecting the first electrode terminal 200 is changed from the first face 101 to the third face 103. Likewise, the electrical connection position of the second electrode terminal 210 is converted from the second surface 102 to the third surface 103 by the second connection piece 310. Therefore, in the process of assembling the battery cells 1000 into the power battery 2000, the series connection of two adjacent battery cells 1000 can be completed only on the third surface 103. In this way, in the solution that the battery cell 1000 is directly integrated into the battery pack, only the third surface 103 of the battery cell 1000 needs to face the open end of the tray 2100. At this time, although the first and second electrode terminals 200 and 210 of the battery cells 1000 are still opposite to the frame of the tray 2100, the electrical connection positions of the first and second electrode terminals 200 and 210 are already switched to the third surface 103, and thus the series connection of the battery cells 1000 can be completed at the opening of the tray 2100. No matter the height of the frame of the tray 2100 or the height of the frame, the assembly of the battery cell 1000 is not blocked, so that the assembly difficulty of the battery cell 1000 is reduced.

In an embodiment, referring to fig. 3, the battery cell body 100 includes an outer casing 110, a first cover plate 120, and a second cover plate 130, where the outer casing 110 includes a first side 114 and a second side 115 opposite to each other, and includes a mounting surface located between the first side 114 and the second side 115; the mounting surface is provided with a first recess 116 and a second recess 117, the first recess 116 being connected to the first side 114 and the second recess 117 being connected to the second side 115.

The outer shell 110 is provided with an injection chamber, and with a first opening 111 and a second opening 112 communicating with the injection chamber; first opening 111 is located on first side 114 and first recess 116, and second opening 112 is located on second side 115 and second recess 117.

The first cover plate 120 is fixedly connected to the outer casing 110 and closes the first opening 111; the surface of the first cover plate 120 facing away from the first side 114 is a first surface 101, and the surface of the first cover plate 120 facing away from the first recess 116 and the outer shell 110 form a first groove 104; the surface of the second cover plate 130 facing away from the second side 115 is a second surface 102, and the surface of the second cover plate 130 facing away from the second recess 117 and the outer shell 110 form a second groove 105; the mounting surface is a third surface 103.

The first cover plate 120 and the second cover plate 130 are respectively welded and fixed to the cell body 100, so that the liquid injection chamber 113 becomes a sealed chamber. The first cover plate 120 is provided with a liquid injection hole communicated with the liquid injection chamber 113, and the liquid injection hole is used for being connected with external liquid injection equipment, so that the liquid injection equipment injects electrolyte into the liquid injection chamber 113. An explosion-proof valve is disposed on the second cover plate 130 to prevent the battery cell 1000 from exploding. In another embodiment, the first cover plate 120 may be provided with an explosion-proof valve, and the second cover plate 130 may be provided with a liquid filling hole.

The outer casing 110 is a rectangular sheet, the first cover plate 120 and the second cover plate 130 have the same shape and material, and the outer casing 110, the first cover plate 120 and the second cover plate 130 are made of aluminum and have the same material. The first cover plate 120 and the second cover plate 130 each include a first plate 121, a second plate 122, and a third plate 123, the first plate 121 and the third plate 123 are fixedly connected to opposite ends of the first plate 121, respectively, the first plate 121 is perpendicular to the second plate 122, the second plate 122 is perpendicular to the third plate 123, and the first plate 121 and the third plate 123 extend in opposite directions. The first plate 121 of the first cover plate 120 forms the first face 101 of the battery cell body 100, and the second plate 122 and the third plate 123 of the first cover plate 120 cooperate with the outer casing 110 to form the first groove 104. The first plate 121 of the second cover plate 130 forms the second surface 102 of the cell body 100, and the second plate 122 and the third plate 123 of the second cover plate 130 cooperate with the outer casing 110 to form the second groove 105.

In one embodiment, referring to fig. 4 and 5, the battery cell 1000 further includes a first lead-out sheet 400, a first insulating member 500, and a second insulating member 510; the first lead-out piece 400 and the first insulating member 500 are located inside the injection chamber, and the second insulating member 510 is located outside the injection chamber; the first lead tab 400, the first insulating member 500, the first cap plate 120, the second insulating member 510, and the first connection tab 300 are sequentially stacked. The first insulating member 500 and the first cover plate 120 are provided with positioning grooves, a portion of the first cover plate 120 is located in the positioning groove of the first insulating member 500, and a portion of the second insulating member 510 is located in the positioning groove of the first cover plate 120. Therefore, on the one hand, the size of the battery cell 1000 can be reduced, so that the structure of the battery cell 1000 is more compact, and on the other hand, the connection stability among the first insulating member 500, the first cover plate 120, and the second insulating member 510 can be increased.

One end of the first electrode terminal 200 is positioned in the injection chamber and fixedly connected with the first lead-out piece 400; the other end of the first electrode terminal 200 sequentially penetrates through the first insulating member 500, the first cap plate 120, and the second insulating member 510, and is fixedly connected to the first connection segment 301.

The first lead-out piece 400 is provided with three first mounting holes 401, and the three first electrode terminals 200 are respectively connected with the three first mounting holes 401. The first insulating member 500 has the same shape as the first cover plate 120 and is made of plastic. The second insulator 510 is made of plastic.

In one embodiment, referring to fig. 4 and fig. 5, the battery cell 1000 further includes a second lead-out piece 410, a fourth insulating member 530, and a fifth insulating member 540; the second lead-out piece 410 and the fourth insulating member 530 are located inside the injection chamber, and the fifth insulating member 540 is located outside the injection chamber; the second lead-out piece 410, the fourth insulating member 530, the second cover plate 130, the fifth insulating member 540, and the second connection piece 310 are sequentially stacked. The fourth insulating member 530 and the second cover plate 130 are provided with positioning slots, a portion of the second cover plate 130 is located in the positioning slot of the fourth insulating member 530, and a portion of the fifth insulating member 540 is located in the positioning slot of the second cover plate 130. Accordingly, the size of the battery cell 1000 may be reduced on the one hand, so that the structure of the battery cell 1000 may be more compact, and in the other direction, the connection stability among the fourth insulating member 530, the second cover plate 130, and the fifth insulating member 540 may be increased.

One end of the second electrode terminal 210 is positioned in the injection chamber and is fixedly connected with the second lead-out piece 410; the other end of the second electrode terminal 210 sequentially penetrates through the fourth insulating member 530, the second cover plate 130 and the fifth insulating member 540, and is fixedly connected to the second connection section 311.

The second lead tab 410, the fourth insulating member 530 and the fifth insulating member 540 are the same as the first lead tab 400, the first insulating member 500 and the second insulating member 510, respectively. That is, the first electrode terminal 200 and the second electrode terminal 210 are connected in the same manner, and the battery cell 1000 may have a symmetrical structure. Wherein the second lead-out piece 410 is provided with three second mounting holes 411, and the three second electrode terminals 210 are respectively connected with the three second mounting holes 411. The fourth insulating member 530 has the same shape as the second cap plate 130. The fourth insulating member 530 and the fifth insulating member 540 are made of plastic.

In this embodiment, both ends of the first electrode terminal 200 are connected to the first lead tab 400 and the first connection tab 300, respectively, and both ends of the second electrode terminal 210 are connected to the second lead tab 410 and the second connection tab 310, respectively, to transmit electric energy out of the sealed case body 110. Accordingly, the first lead tab 400, the second lead tab 410, the first electrode terminal 200, the second electrode terminal 210, the first connection tab 300, and the second tab are charged. The battery cell body 100 cannot be electrified, that is, the outer casing 110, the first cover plate 120 and the second cover plate 130 cannot be electrified, so as to prevent electric leakage. The first insulating member 500 is provided between the first cap plate 120 and the first lead tab 400 to prevent electric power of the first lead tab 400 from being transferred to the first cap plate 120. The second insulating member 510 is disposed between the first cap plate 120 and the first connection tab 300 to prevent the electric power of the first connection tab 300 from being transmitted to the first cap plate 120. The fourth insulating member 530 is disposed between the second cap plate 130 and the second tab 410 to prevent electric power of the second tab 410 from being transferred to the second cap plate 130. The fifth insulating member 540 is disposed between the second cap plate 130 and the second connection piece 310 to prevent the electric power of the second connection piece 310 from being transferred to the second cap plate 130.

In the embodiment of the present application, the first cover plate 120 can be prevented from being energized by providing the first insulating member 500 and the second insulating member 510. Similarly, the fourth insulating member 530 and the fifth insulating member 540 are also provided to prevent the second cover plate 130 from being electrified, so as to prevent electric leakage and ensure the safety of the battery cell 1000 in the use process.

In one embodiment, referring to fig. 4 and 5, the battery cell 1000 further includes a third insulating member 520 and a sixth insulating member 550. The third insulating member 520 is fixedly connected to a side of the first connecting section 301 away from the cell body 100; the sixth insulating member 550 is fixedly connected to a side of the second connection segment 311 away from the cell body 100.

As will be appreciated by those skilled in the art, during assembly of the battery cell 1000 into the power battery 2000, the battery cell 1000 needs to be placed in the tray 2100 (shown in fig. 6). And the first face 101 and the third face 103 of the battery cell body 100 are respectively in contact with two side faces of the tray 2100, so that the third insulating member 520 and the sixth insulating member 550 are arranged, and the first connecting piece 300 and the second connecting piece 310 can be prevented from being conducted with the tray 2100, thereby ensuring the safety of the battery cell 1000 in the using process.

In one embodiment, the second insulating member 510 is provided with a third groove 511, the first connecting section 301 and the third insulating member 520 are both located in the third groove 511, and one surface of the third insulating member 520 facing away from the cell body 100 is flush with one surface of the second insulating member 510 facing away from the cell body 100. The fifth insulating member 540 is provided with a fourth groove 541, the second connection section 311 and the sixth insulating member 550 are both located in the fourth groove 541, and one surface of the sixth insulating member 550 departing from the cell body 100 is flush with one surface of the fifth insulating member 540 departing from the cell body 100.

It will be understood by those skilled in the art that the first welding segment 302 may also be located in the third groove 511, and the third groove 511 is two ends that are connected. By doing so, the length of the battery cell 1000 can be reduced by reducing the length of the battery cell 100 by reducing the length of the side members on the first surface 101 and the second surface 102 of the battery cell body 100. That is, the length of the power battery 2000 is reduced, so that the power battery 2000 can be installed in the automobile, the installation space can be saved, and the flexible design of the automobile is facilitated.

In one embodiment, referring to fig. 4 and 5, the battery cell 1000 further includes a first sealing ring 600 and a second sealing ring 610; the first sealing ring 600 is sleeved on the first electrode terminal 200, the first sealing ring 600 is located between the first cover plate 120 and the first insulating member 500, and at least a portion of the first sealing ring 600 penetrates through the first cover plate 120 to isolate the first electrode terminal 200 from the first cover plate 120.

The second sealing ring 610 is sleeved on the second electrode terminal 210, the second sealing ring 610 is located between the second cover plate 130 and the fourth insulating member 530, and at least a portion of the second sealing ring 610 penetrates through the second cover plate 130 to isolate the second electrode terminal 210 from the second cover plate 130.

Through setting up first sealing washer 600 and second sealing washer 610, can avoid on the one hand external debris to follow first electrode terminal 200 and/or second electrode terminal 210 and get into in the electricity core body 100 to avoid because debris lead to electric core 1000 short circuit or resistance increase etc. increase the life of electricity core 1000. On the other hand, when the first electrode terminal 200 passes through the first cap plate 120, the first seal 600 separates the first electrode terminal 200 from the first cap plate 120, thereby preventing the electric conduction of the first electrode terminal 200 to the first cap plate 120 and preventing the electric leakage. When the second electrode terminal 210 passes through the second cap plate 130, the second sealing ring 610 separates the second electrode terminal 210 from the second cap plate 130, preventing the electric conduction of the second electrode terminal 210 to the second cap plate 130.

Referring to fig. 6, a second aspect of the present application provides a power battery 2000, including any one of the battery cells 1000, a tray 2100, a plurality of welding tabs 2200, and a distribution box 2400; the tray comprises an accommodating cavity and an opening communicated with the accommodating cavity; a plurality of battery cells 1000 are positioned in the accommodating cavity in parallel, specifically, the battery cells 1000 may be bonded to the bottom wall of the accommodating cavity by using an insulating adhesive, the first surface 101 of any battery cell 1000 and the second surface 102 of the adjacent battery cell 1000 are positioned on the same side, and the third surface 103 of the battery cell 1000 faces the opening; the first welding segment 302 of any of the battery cells 1000 is connected to the second welding segment 312 of an adjacent battery cell 1000 by a welding tab 2200, so that a plurality of battery cells 1000 are connected in series in sequence. The distribution box 2400 is electrically connected to the plurality of battery cells 1000 connected in series, and the distribution box 2400 may control on/off of the battery cells 1000, monitor the temperature of the battery cells 1000, and transmit electric energy of the battery cells 1000 to a motor controller of a vehicle.

As will be known to those skilled in the art, the power battery 2000 is formed by serially connecting a plurality of battery cells 1000, and therefore, in the present embodiment, in order to facilitate the serial connection of the battery cells 1000, the plurality of battery cells 1000 are alternately arranged. That is, the first surface 101 of the nth battery cell 1000 and the second surface 102 of the (N + 1) th battery cell 1000 are located on the same side wall of the accommodating cavity, that is, the first connection piece 300 connected to the first electrode terminal 200 of the nth battery cell 1000, and the second connection piece 310 connected to the second electrode terminal 210 of the (N + 1) th battery cell 1000 are located on the same side of the accommodating cavity, and at this time, the first welding section 302 of the nth battery cell 1000 and the second connection section 311 of the (N + 1) th battery cell 1000 are welded and conducted only by the welding piece 2200, that is, the conduction between the nth battery cell 1000 and the (N + 1) th battery cell 1000 is realized. Wherein N is a positive integer greater than or equal to 1.

In the embodiment of the present application, since the first welding segment 302 and the second welding segment 312 are both located on the third surface 103 of the battery cell body 100, and the third surface 103 of the battery cell body 100 is open toward the accommodating cavity, the serial welding between the battery cells 1000 is not affected by the distance between the two sides of the accommodating cavity and the battery cells 1000. Therefore, even if the peripheral frame of the bracket is higher than the height of the battery cell 1000, the serial connection between the battery cells 1000 is not affected. As can be known to those skilled in the art, in the embodiment of the present application, the height of the battery cell 1000 refers to a dimension of the battery cell 1000 perpendicular to the third face 103.

In one embodiment, the power battery 2000 further comprises a cold liquid plate 2300, wherein the cold liquid plate 2300 is connected to the tray 2100 and covers the opening, and the cold liquid plate 2300 covers at least the first welding section 302 and/or the second welding section 312 of the battery cell 1000. As will be known by those skilled in the art, in the use process of the power battery 2000, the welding tab 2200 of the adjacent cells 1000 connected in series is also one of the positions with the largest heat generation amount, and therefore, in the embodiment of the present application, the cold liquid plate 2300 covers the welding tab 2200, so that the cooling effect can be performed on the welding tab 2200. In the embodiment of the present application, it is preferable that the cold liquid plate 2300 covers the welding tab 2200 at the same time. Specifically, the cold plate 2300 is provided with cooling channels that communicate with a device containing a cooling fluid. The cooling fluid flows back and forth between the cooling channel and the equipment containing the cooling fluid to take away heat emitted from the battery cell 1000, thereby preventing the power battery 2000 from overheating.

In one embodiment, the bracket comprises a base 2101, a frame 2102, a cross beam 2103, and a longitudinal beam 2104, the base end of the frame 2102 is fixedly connected to the base 2101, the frame 2102 and the base 2101 form a receiving cavity, and the cross beam 2103 and the longitudinal beam 2104 are both positioned in the receiving cavity and fixedly connected to the base 2101. In this manner, the accommodation chamber is divided into a plurality of sub-accommodation chambers by the longitudinal beams 2104 and the cross beams 2103. The power battery 2000 further comprises a distribution box 2400, the distribution box 2400 can be placed in one of the sub-containing cavities, a plurality of battery cells 1000 are arranged in the rest sub-containing cavities, all the battery cells 1000 are connected in series through welding pieces 2200 and are finally electrically connected with the distribution box 2400, and the distribution box 2400 is used for being connected with the outside. In the embodiment of the present application, by providing the longitudinal beams 2104 and the cross beams 2103, on one hand, the strength of the bracket can be increased; secondly, all the batteries can be prevented from being positioned in one accommodating cavity, so that heat dissipation is facilitated; finally, the distribution box 2400 can be placed in the accommodating cavity, so that the power battery 2000 is integrated.

A third aspect of the present application provides a vehicle including a motor controller and any one of the power batteries 2000 described above, the motor controller being electrically connected to the power battery 2000. Specifically, the motor controller is electrically connected to the distribution box 2400, and the electric energy provided by the plurality of battery cells 1000 is transmitted to the motor controller through the distribution box 2400, and the motor controller utilizes and distributes the electric energy to each motor of the vehicle and other components requiring power utilization.

The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the description of the embodiments is only provided to help understand the method and the core concept of the present application.

Claims (13)

1. A battery cell, comprising: the battery cell comprises a battery cell body, a first electrode terminal, a second electrode terminal, a first connecting sheet and a second connecting sheet;

the battery cell body comprises a first surface, a second surface and a third surface, wherein the first surface and the second surface are arranged in a reverse manner, and the third surface is connected with the first surface and the second surface; the battery cell body is provided with a first groove and a second groove, and the first groove is formed by sinking the third surface and penetrating through the first surface; the second groove is formed by sinking the third surface and penetrating through the second surface;

either one of the first electrode terminal and the second electrode terminal is a positive electrode, and the other one is a negative electrode; the first electrode terminal is fixedly connected with the first surface, and the second electrode terminal is fixedly connected with the second surface;

the first connecting piece comprises a first connecting section and a first welding section which are fixedly connected; the second connecting piece comprises a second connecting section and a second welding section which are fixedly connected; the first connecting section is fixedly connected with the first electrode terminal, and the first welding section is positioned in the first groove; the second connecting section is fixedly connected with the second electrode terminal, and the second welding section is positioned in the second groove.

2. The cell of claim 1, wherein the cell body comprises an outer casing, a first cover plate, and a second cover plate, the outer casing comprising opposing first and second sides, and a mounting surface located between the first and second sides; the mounting surface is provided with a first concave part and a second concave part, the first concave part is connected with the first side, and the second concave part is connected with the second side;

the outer shell is provided with an injection chamber, a first opening and a second opening which are communicated with the injection chamber; the first opening is located on the first side and the first recess, and the second opening is located on the second side and the second recess;

the first cover plate is fixedly connected with the outer shell and closes the first opening; one surface of the first cover plate, which is far away from the first side, is the first surface, and the surface of the first cover plate, which is far away from the first concave part, and the outer shell form the first groove; one surface of the second cover plate, which is far away from the second side, is the second surface, and the surface of the second cover plate, which is far away from the second concave part, and the outer shell form the second groove; the mounting surface is the third surface.

3. The battery cell of claim 2, further comprising a first lead-out tab, a first insulating member, and a second insulating member; the first lead-out sheet and the first insulating piece are positioned in the injection cavity, and the second insulating piece is positioned outside the injection cavity; the first leading-out sheet, the first insulating piece, the first cover plate, the second insulating piece and the first connecting sheet are sequentially stacked;

one end of the first electrode terminal is positioned in the injection cavity and fixedly connected with the first lead-out piece; the other end of the first electrode terminal penetrates through the first insulating part, the first cover plate and the second insulating part in sequence and is fixedly connected with the first connecting section.

4. The cell of claim 3, further comprising a third insulator; the third insulating part is fixedly connected to one side of the first connecting section, which deviates from the battery cell body.

5. The battery cell of claim 4, wherein the second insulating member is provided with a third groove, the first connecting section and the third insulating member are both located in the third groove, and a surface of the third insulating member facing away from the battery cell body is flush with a surface of the second insulating member facing away from the battery cell body.

6. The cell of claim 3, further comprising a first sealing ring; the first sealing ring is sleeved on the first electrode terminal; the first sealing ring is located between the first cover plate and the first insulating member, and at least a portion of the first sealing ring penetrates through the first cover plate to isolate the first electrode terminal from the first cover plate.

7. The battery cell of claim 2, further comprising a second lead-out tab, a fourth insulating member, and a fifth insulating member; the second leading-out piece and the fourth insulating piece are positioned in the injection cavity, and the fifth insulating piece is positioned outside the injection cavity; the second lead-out sheet, the fourth insulating piece, the second cover plate, the fifth insulating piece and the second connecting sheet are sequentially stacked;

one end of the second electrode terminal is positioned in the injection cavity and is fixedly connected with the second lead-out sheet; the other end of the second electrode terminal penetrates through the fourth insulating part, the second cover plate and the fifth insulating part in sequence and is fixedly connected with the second connecting section.

8. The cell of claim 7, further comprising a sixth insulator; and the sixth insulating part is fixedly connected to one side of the second connecting section, which deviates from the battery cell body.

9. The battery cell of claim 8, wherein the fifth insulating member is provided with a fourth groove, the second connecting section and the sixth insulating member are both located in the fourth groove, and a surface of the sixth insulating member facing away from the battery cell body is flush with a surface of the fifth insulating member facing away from the battery cell body.

10. The cell of claim 7, further comprising a second sealing ring; the second sealing ring is sleeved on the second electrode terminal, is positioned between the second cover plate and the fourth insulating part, and at least part of the second sealing ring penetrates through the second cover plate so as to isolate the second electrode terminal from the second cover plate.

11. A power battery comprising a plurality of cells of any of claims 1 to 10, a tray, and a plurality of weld tabs; the tray comprises an accommodating cavity and an opening communicated with the accommodating cavity; the plurality of battery cells are arranged in the accommodating cavity in parallel, a first surface of any battery cell and an adjacent second surface of the battery cell are positioned on the same side, and a third surface of the battery cell faces the opening; the first welding section of any battery cell is connected with the second welding section of the adjacent battery cell through one welding sheet, so that the battery cells are sequentially connected in series.

12. The power battery of claim 11, further comprising a cold liquid plate, wherein the cold liquid plate is connected to the tray and covers the opening, and the cold liquid plate covers at least the first welding section and/or the second welding section of the battery cell.

13. A vehicle comprising a motor controller and the power battery of claim 11 or 12, the motor controller being electrically connected to the power battery.

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