WO2022062608A1

WO2022062608A1 - Battery, battery pack and electric vehicle

Info

Publication number: WO2022062608A1
Application number: PCT/CN2021/107070
Authority: WO
Inventors: 高健; 胡世超; 彭青波; 朱燕
Original assignee: 比亚迪股份有限公司
Priority date: 2020-09-27
Filing date: 2021-07-19
Publication date: 2022-03-31
Also published as: CN114361630A

Abstract

Provided are a battery (100), a battery pack (300) and an electric vehicle (400). The battery pack (300) comprises a shell (10), a pole set (20) and a sampling assembly (30). The pole set (20) is arranged in the shell (10), and the pole set (20) comprises a plurality of pole groups (202) that are connected in series. The sampling assembly (30) is arranged in the shell (10), and the sampling assembly (30) comprises a circuit board (301), a plurality of protection components (309) and a plurality of sampling lines (302), wherein a plurality of first circuits (303) are arranged on the circuit board (301); input ends of the first circuits (303) are electrically connected to the corresponding pole groups (20) by means of the corresponding sampling lines (302); output ends of the first circuits (303) are used for being electrically connected to a battery information collector (200); and the protection components are arranged between the sampling lines and the first circuits.

Description

A battery, battery pack and electric vehicle

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of the Chinese patent application number "202011030745.4" filed by BYD Co., Ltd. on 2020-09-27 with the invention title "A battery, battery pack and electric vehicle".

technical field

The present application relates to the field of batteries, and in particular, to a battery, a battery pack and an electric vehicle.

Background technique

The power battery pack needs to collect information such as the temperature and/or voltage of the battery during use to understand the current working condition of the battery, so as to avoid potential safety hazards due to abnormal battery operation. At present, a common sampling structure in a battery pack is to arrange an FPC (Flexible Printed Circuit, flexible circuit board) on a battery module or a battery to collect battery-related information.

In the related art, in order to increase the voltage of the battery, a plurality of pole cores connected in series are usually arranged inside the battery, but the above sampling structure cannot sample each pole core inside the battery, and thus cannot know the working state of each pole core. Moreover, no safety protection device is provided inside the battery, which also brings great safety problems to the use of the battery.

SUMMARY OF THE INVENTION

The content of the present application aims to solve at least one of the problems existing in the prior art. To this end, in a first aspect of the present application, a battery is provided, the battery comprising:

case;

a pole core string, the pole core string is arranged in the housing, the pole core string includes a plurality of pole core groups connected in series; and,

A sampling assembly, the sampling assembly is arranged in the casing, the sampling assembly includes a circuit board, a plurality of protection components and a plurality of sampling lines, the circuit board is provided with a plurality of first circuits, the first The input end of the line is electrically connected with the corresponding pole core group through the corresponding sampling line, the output end of the first line is used for being electrically connected with the battery information collector, and the sampling line and the first line are provided with a the protection components.

In some embodiments of the present application, the protection component is a fuse.

In some embodiments of the present application, the fuse is integrally formed with the corresponding first circuit; or, the fuse is integrally formed with the corresponding sampling line.

In some embodiments of the present application, the first line includes a first connection section and a second connection section, and the protection component is connected between the first connection section and the second connection section of the corresponding first line, so The sampling line is connected to the first connection segment of the corresponding first line.

In some embodiments of the present application, the battery further includes a pin assembly, and the pin assembly includes a plurality of sampling pins, and the sampling pins are used to penetrate through the housing to electrically connect to the corresponding first lines The output terminal and the battery information collector.

In some embodiments of the present application, the circuit board is fixedly connected to the pin assembly.

In some embodiments of the present application, a plurality of first pads and a plurality of second pads are further provided on the circuit board, and the first lines are connected between the corresponding first pads and the second pads , the sampling line is welded with the corresponding first pad, and the sampling pin is welded with the corresponding second pad. In some embodiments of the present application, the battery further includes a ceramic sealing member, the plurality of sampling pins are fixed on the ceramic sealing member, and the ceramic sealing member is fixed on the housing.

In some embodiments of the present application, the ceramic seal is provided with a plurality of through holes, and the sampling pins are fixed in the corresponding through holes.

In some embodiments of the present application, the battery further includes a connecting sleeve, and the ceramic sealing member is fixed on the casing through the connecting sleeve.

In some embodiments of the present application, a groove is formed on the outer side of the casing, a sampling through hole is formed on the bottom wall of the groove, the connecting sleeve is fixed in the groove, and a plurality of the sampling plugs are provided. The needle penetrates through the sampling through hole and the connection sleeve, and the ceramic seal is fixed to an end of the connection sleeve away from the housing.

In some embodiments of the present application, the casing includes a cover plate and a casing body having an opening, the cover plate closes the opening of the casing body to form a sealed accommodating cavity, and the pole core is serially connected to the casing body. In the accommodating cavity; a plurality of the sampling pins are fixed and pass through the cover plate.

In some embodiments of the present application, the plurality of pole core groups in the pole core string are arranged along a first direction, and the first direction is the length direction of the battery, and the length of the battery is 400mm-2500mm.

In some embodiments of the present application, the pole core string further includes a packaging bag, and the pole core group is packaged in the packaging bag.

A second aspect of the present application provides a battery pack, including a battery information collector and the battery according to any one of the above, wherein the battery information collector is electrically connected to the battery.

A third aspect of the present application provides an electric vehicle, including the battery pack described in any one of the above.

The beneficial effects of the present application are: in the battery of the present application, a sampling assembly is arranged in the casing, and the sampling assembly includes a circuit board, a plurality of protection components and a plurality of sampling lines, and a plurality of first lines are arranged on the circuit board, and the first The input end of the line is electrically connected with the corresponding pole core group through the corresponding sampling line, and the output end of the first line is used for electrical connection with the battery information collector, so that the circuit board can sample each pole core group through the sampling line, And the collected information is transmitted to the battery information collector, so as to understand the working state of each pole core group inside the battery, which is beneficial to improve the safety of battery use. Moreover, a protection component is arranged between the sampling line and the first line, and the protection component can play a role of safety protection for the circuit inside the battery, thereby further improving the safety of the battery.

Additional aspects and advantages of the present application will be set forth, in part, from the following description, and in part will become apparent from the following description, or may be learned by practice of the present application.

Description of drawings

1 is a schematic structural diagram of a connection between a battery and an information collector provided by an embodiment of the present application;

Fig. 2 is the schematic diagram of omitting the shell body in Fig. 1;

3 is an exploded view of a battery provided by an embodiment of the present application;

4 is an exploded view of a partial structure of a battery provided by an embodiment of the present application;

5 is a cross-sectional view of a partial structure of a battery provided by an embodiment of the present application;

6 is a schematic diagram of a circuit board provided by an embodiment of the present application;

7 is a schematic diagram of a pole core group packaged in the same packaging bag provided by an embodiment of the present application;

8 is a schematic diagram of an integrally formed packaging film forming a packaging bag according to an embodiment of the present application, wherein a concave is provided on one connecting part;

FIG. 9 is a schematic diagram of an integrally formed packaging film forming a packaging bag according to an embodiment of the present application, wherein two connecting parts are provided with dimples;

FIG. 10 is a schematic diagram illustrating that the pole core groups provided in the embodiment of the present application are packaged in a packaging bag in a one-to-one correspondence;

11 is a schematic diagram of a battery pack provided by an embodiment of the present application;

FIG. 12 is a schematic diagram of an electric vehicle provided by an embodiment of the present application.

Reference number:

100, battery; 200, battery information collector; 300, battery pack; 400, electric vehicle;

10. housing; 101, cover plate; 102, housing body; 103, opening; 104, accommodating cavity; 105, groove; 106, sampling through hole;

20, pole core string; 201, packaging bag; 202, pole core group; 203, pole core group main body; 204, first electrode lead-out part; 205, second electrode lead-out part; 206, packaging part; 207, connecting part; 208, sealed chamber; 209, packaging film; 210, pit; 211, first pole core group; 212, second pole core group;

30, sampling component; 301, circuit board; 302, sampling line; 303, first circuit; 3031, first connection segment; 3032, second connection segment; 304, first pad; 305, second pad; 306 307, signal acquisition element; 308, acquisition line; 309, protection element; 310, first sampling line; 311, second sampling line;

40, pin assembly; 401, sampling pin; 402, mounting seat; 403, mounting hole; 404, collection pin;

50. Ceramic seals; 501. Through holes;

60. Connection sleeve;

70. Insulation parts; 701. Avoid holes.

detailed description

The following describes in detail the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, but should not be construed as a limitation on the present application.

In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Rear, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Axial, Radial, Circumferential The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, with a specific orientation. The orientation configuration and operation are therefore not to be construed as limitations on the present application.

As shown in FIGS. 1 to 10 , the present application provides a battery 100 , which includes a housing 10 , a pole core string 20 and a sampling assembly 30 . The pole core string 20 is disposed in the casing 10 , and the pole core string 20 includes a plurality of pole core groups 202 connected in series. The sampling assembly 30 is arranged in the housing 10 . The sampling assembly 30 includes a circuit board 301 , a plurality of protection components 309 and a plurality of sampling lines 302 . The circuit board 301 is provided with a plurality of first lines 303 , and the input of the first line 303 is The terminal is electrically connected with the corresponding pole core group 202 through the corresponding sampling line 302 , the output end of the first line 303 is used for electrical connection with the battery information collector 200 , and a protection component is arranged between the sampling line 302 and the first line 303 309.

The circuit board 301 may be a PCB board, and the first circuit 303 on the circuit board 301 may be, but not limited to, conductive metal foil, wire, or conductive metal plating. The first circuit 303 may be disposed on the circuit board 301 by, but not limited to, bonding, welding, etching, injection molding, hot pressing, electroplating, electroless plating, and the like.

In the battery 100 of the present application, a sampling assembly 30 is arranged in the casing 10 , and the sampling assembly 30 includes a circuit board 301 , a plurality of protection components 309 and a plurality of sampling lines 302 , and a plurality of first lines 303 are arranged on the circuit board 301 , the input end of the first line 303 is electrically connected to the corresponding pole core group 202 through the corresponding sampling line 302 , and the output end of the first line 303 is electrically connected to the battery information collector 200 , so that the circuit board 301 can be connected to the battery information collector 200 through the sampling line 302 Each pole core group 202 is sampled, and the collected information (for example, voltage and/or current) is transmitted to the battery information collector 200, so as to understand the working status of each pole core group 202 inside the battery 100, which is beneficial to improve the battery 100% safe to use. Moreover, a protection component 309 is disposed between the sampling line 302 and the first line 303 , and the protection component 309 can play a role of safety protection for the circuit inside the battery 100 , thereby further improving the safety of the battery 100 .

In some embodiments, the pole core group 202 includes a pole core group main body 203 and a first electrode lead-out part 204 and a second electrode lead-out part 205 for drawing current, for connecting the first electrodes of the two pole core groups 202 in series The lead-out part 204 and the second electrode lead-out part 205 can be electrically connected to the same sampling line 302, and the first electrode lead-out part 204 that is not used to connect the two pole core groups 202 in series is electrically connected to the first end of one sampling line 302, The second electrode lead-out part 205 , which is not used for connecting the two pole core assemblies 202 in series, is electrically connected to the first end of the other sampling line 302 . In this way, the number of sampling lines 302 can be reduced, which is beneficial to saving costs.

Of course, in other embodiments, the first electrode lead-out member 204 of each pole core group 202 can also be set to be electrically connected to the first end of the corresponding sampling line 302 respectively, and the second electrode of each pole core group 202 The lead-out parts 205 are respectively electrically connected to the corresponding sampling lines 302; alternatively, the first electrode lead-out parts 204 of several pole core groups 202 can be respectively electrically connected to the corresponding sampling lines 302, and the first electrode lead-out parts 204 of several pole core groups 202 The two electrode lead-out parts 205 are respectively electrically connected to the corresponding sampling lines 302 .

As shown in FIG. 3 , the pole core string 20 includes two pole core groups 202 . The two pole core groups 202 are a first pole core group 211 and a second pole core group 212 respectively. The first electrode of the first pole core group 211 The lead-out part 204 is electrically connected to the first sampling line 310 , and the second electrode lead-out part 205 of the first pole core group 211 and the first electrode lead-out part 204 of the second pole core group 212 are electrically connected to the same second sampling line 311 .

In addition, the sampling lines 302 , the protection components 309 and the first lines 303 are arranged in a one-to-one correspondence.

It should be noted that the pole core group 202 may be composed of a single pole core, or may include at least two pole cores, and at least two pole cores are connected in parallel to form the pole core group 202 . For example, two pole cores are connected in parallel to form the pole core group 202 , or three pole cores are connected in parallel to form the pole core group 202 .

If the pole core group 202 contains one pole core, one of the first electrode lead-out part 204 and the second electrode lead-out part 205 is a positive electrode lug, and the other is a negative electrode lug; if the pole core group 202 contains a plurality of pole cores, the first electrode One of the lead-out part 204 and the second electrode lead-out part 205 is a composite tab formed by combining the positive tabs of a plurality of pole cores and welding together, and the other is a composite tab formed by combining and welding the negative tabs of a plurality of pole cores together. Pole ear.

In this application, the pole core mentioned is the pole core commonly used in the field of power battery 100, and the pole core and the pole core group 202 are the internal components of the battery 100, and cannot be understood as the battery itself; The battery 100 described above is an independent single battery, and cannot be simply understood as a battery module or a battery pack because it contains multiple pole cores. In addition, the pole core in this application may be a pole core formed by winding, or a pole core made by lamination; generally, the pole core includes at least a positive electrode sheet, a separator and a negative electrode sheet.

The battery 100 in the present application can be a liquid battery, that is, the electrode core contains an electrolyte, or it can be a solid-state battery, and the electrode core contains a solid electrolyte or a gel polymer electrolyte.

In some embodiments, the protection component 309 is a fuse. Of course, the protection element 309 can also be a conductive sheet, and the conductive sheet is provided with a weak area; or, the protection element 309 can also be a protection structure formed by its own circuit structure. When the current of the circuit inside the battery 100 exceeds the threshold, the protection component 309 can play the role of overcurrent protection, thereby improving the safety of the battery 100 in use. Additionally, the fuse may be a serpentine fuse or a chip fuse.

In some embodiments, the fuse and the corresponding first circuit 303 are integrally formed; for example, the fuse and the first circuit 303 are integrally formed on the circuit board 301 by etching. Alternatively, the fuse is integrally formed with the corresponding sampling line 302 . The integration of the fuse and the first circuit 303 is beneficial to reduce the number of structural parts and to simplify assembly.

In some embodiments, as shown in FIGS. 3 to 5 , the battery 100 further includes a pin assembly 40 , the pin assembly 40 includes a plurality of sampling pins 401 , and the sampling pins 401 are used to penetrate through the housing 10 for electrical connection The output end of the corresponding first line 303 is the same as that of the battery information collector 200 . In the present application, the sampling pins 401 are arranged in a one-to-one correspondence with the first lines 303 . The inner end of the sampling pin 401 is connected to the output end of the corresponding first line 303 , and the outer end of the sampling pin 401 is connected to the battery information collector 200 . The inner end of the sampling pin 401 refers to the end of the sampling pin 401 inside the housing 10 , and the outer end of the sampling pin 401 refers to the end of the sampling pin 401 outside the housing 10 .

As shown in FIG. 4 and FIG. 6 , the first line 303 includes a first connection section 3031 and a second connection section 3032 , and the protection element 309 is connected to the first connection section 3031 and the second connection section 3032 of the corresponding first line 303 . In between, the sampling line 302 is connected with the first connection section 3031 of the corresponding first line 303 . That is, the sampling line 302 is connected to the corresponding protection component 309 through the first connecting section 3031 of the corresponding first line 303 , and the second connecting section 3032 of the first line 303 is connected to the corresponding sampling pin 401 . In a specific embodiment, the fuse is connected between the first connection segment 3031 and the second connection segment 3032 of the corresponding first line 303 , and the fuse, the first connection segment 3031 and the second connection segment 3032 of the first line 303 are three One piece.

In some embodiments, as shown in FIGS. 3 to 5 , the casing 10 includes a cover plate 101 and a casing body 102 having an opening 103 , and the cover plate 101 closes the opening 103 of the casing body 102 to form a sealed accommodating cavity 104 , The pole core string 20 is arranged in the accommodating cavity 104 ; a plurality of sampling pins 401 are fixed and penetrate through the cover plate 101 .

In the present application, both ends of the housing body 102 along the first direction have openings 103 , two cover plates 101 are provided, each cover plate 101 closes the corresponding opening 103 , and a plurality of sampling pins 401 are fixed and penetrate through the same one Cover plate 101 . Wherein, the first direction is the length direction of the battery. As shown in FIG. 3 , the first direction is the X direction in the drawing.

In some embodiments, the circuit board 301 is fixedly connected to the pin assembly 40 . Of course, in other embodiments, the circuit board 301 can also be fixed on the inner wall of the casing 10 .

Further, in some embodiments, as shown in FIG. 3 and FIG. 6 , a plurality of first pads 304 and a plurality of second pads 305 are further provided on the circuit board 301 , and the first lines 303 are connected to corresponding first pads 304 . Between a pad 304 and a second pad 305 , the sampling line 302 is welded to the corresponding first pad 304 , and the sampling pin 401 is welded to the corresponding second pad 305 . In this application, the sampling lines 302 are in one-to-one correspondence with the first pads 304 , and the sampling pins 401 are in one-to-one correspondence with the second pads 305 .

The first pad 304 is configured as the input end of the first line 303 , and the second pad 305 is configured as the output end of the first line 303 .

As shown in FIG. 6 , the first pad 304 is a surface mount pad, that is, the first pad 304 is in the shape of a sheet, the first end of the sampling line is connected to the corresponding pole core group, and the second end of the sampling line 302 can be Solder on the surface of the corresponding first pad 304 to be electrically connected with the corresponding first circuit 303 . The second pad 305 can be a socket pad, that is, a socket is provided in the second pad 305, and the sampling pin 401 can be inserted and welded in the socket, so as to communicate with the corresponding second pad 305 through the corresponding second pad 305. The first line 303 is electrically connected. Of course, the first pad 304 can also be a socket pad, and the second pad 305 can also be a surface mount pad. The first pad 304 and the second pad 305 may be the same or different, and the specific forms of the first pad 304 and the second pad 305 are not specifically limited in this application.

Of course, in other embodiments, the circuit board 301 can also be fixedly connected to the pin assembly 40 by means of riveting, bonding, injection molding, or hot pressing.

In some embodiments, as shown in FIGS. 3 to 5 , the pin assembly 40 further includes a mounting seat 402 provided in the housing 10 , and the mounting seat 402 is sleeved on the plurality of sampling pins 401 . It can be understood that the sampling pins 401 can be installed on the mounting seat 402 first during assembly, so as to facilitate the connection and fixation of each sampling pin 401 and the circuit board 301 .

Specifically, the mounting seat 402 is provided with a plurality of mounting holes 403 , and the sampling pins 401 are correspondingly fixed in the mounting holes 403 . In addition, both the inner end and the outer end of the sampling pin 401 extend out of the installation hole 403 .

It should be noted that the connection between the mounting seat 402 and the sampling pin 401 may be, but not limited to, interference fit, bonding, welding, injection molding, or hot pressing. In addition, the sampling pins 401 can be fixed in the installation holes 403 in a one-to-one correspondence. Of course, a plurality of sampling pins 401 may also be fixed in one mounting hole 403, and in this case, the sampling pins 401 need to be insulated from each other.

In some embodiments, as shown in FIG. 3 to FIG. 5 , the battery 100 further includes a ceramic seal 50 , a plurality of sampling pins 401 are fixed on the ceramic seal 50 , and the ceramic seal 50 is fixed on the case 10 . That is, the plurality of sampling pins 401 are fixed on the housing 10 through the ceramic seal 50 . The ceramic seal 50 can effectively ensure the sealing performance of the connection between the sampling pin 401 and the housing 10 . As shown in FIG. 4 , the ceramic seal 50 is fixed on the cover plate 101 .

As shown in FIG. 4 , the ceramic seal 50 is provided with a plurality of through holes 501 , and the sampling pins 401 are fixed in the corresponding through holes 501 . It can be understood that the sampling pins 401 can be fixed in the through holes 501 in a one-to-one correspondence; of course, a plurality of sampling pins 401 can also be fixed in one through hole 501, and the sampling pins 401 need to be insulated from each other.

It should be noted that the manner in which the sampling pin 401 is fixed to the through hole 501 may be, but not limited to, welding, interference fit, and bonding. For example, the sampling pin 401 can be fixed in the through hole 501 by soldering.

As shown in FIG. 3 to FIG. 5 , the battery 100 further includes a connecting sleeve 60 , and the ceramic sealing member 50 is fixed on the casing 10 through the connecting sleeve 60 . Specifically, the ceramic seal 50 is fixed on the cover plate 101 through the connecting sleeve 60 .

It should be noted that, the connection method between the connection sleeve 60 and the housing 10 and the connection sleeve 60 and the ceramic seal 50 may be, but not limited to, welding, interference fit, and bonding. For example, the connecting sleeve 60 is fixed on the housing 10 by laser welding, and the ceramic sealing member 50 is fixed on the connecting sleeve 60 by brazing.

Further, as shown in FIG. 4 and FIG. 5 , a groove 105 is provided on the outer side of the housing 10 , a sampling through hole 106 is provided on the bottom wall of the groove 105 , the connecting sleeve 60 is fixed in the groove 105 , and the sampling plug is inserted into the groove 105 . The needle 401 penetrates through the sampling through hole 106 and the connection sleeve 60 , and the ceramic seal 50 is fixed to the end of the connection sleeve 60 away from the housing 10 . Wherein, the outer side of the casing 10 refers to the side of the casing 10 facing away from the accommodating cavity 104 . By fixing the connection sleeve 60 in the groove 105 , the external space occupied by the connection sleeve 60 can be reduced, which is beneficial to reduce the size of the battery 100 . Specifically, the outer side of the cover plate 101 is provided with a groove 105 , and the ceramic seal 50 is fixed to the end of the connection sleeve 60 away from the cover plate 101 .

As shown in FIG. 4 and FIG. 5 , the battery 100 further includes an insulating member 70 . The insulating member 70 is disposed between the cover plate 101 and the circuit board 301 . The insulating member 70 is provided with an escape hole 701 , and the escape hole 701 is used to avoid a plurality of Sampling pin 401.

As shown in FIG. 3 , FIG. 4 and FIG. 6 , the circuit board 301 is further provided with a second circuit 306 , and the sampling assembly 30 further includes a signal acquisition element 307 and an acquisition line 308 , and the signal acquisition element 307 communicates with the second circuit through the acquisition line 308 . 306 Electrical connection.

Wherein, the second circuit 306 on the circuit board 301 may be, but not limited to, conductive metal foil, wire or conductive metal plating. The second circuit 306 may be disposed on the circuit board 301 by, but not limited to, bonding, welding, etching, injection molding, hot pressing, electroplating, electroless plating, and the like. In addition, the second line 306 and the first line 303 may be the same or different, which are not specifically limited in this application.

In some embodiments, the signal acquisition element 307 is at least one of a temperature sensing element, a humidity sensing element, a pressure sensing element, and an odor sensing element. It can be understood that the signal collecting element 307 may be in contact with the pole core group 202 or not in contact with the pole core group 202 . This is not specifically limited in this application. For example, the signal collecting element 307 may be attached to the electrode core group main body 203 or the first electrode lead-out part 204 or the second electrode lead-out part 205 or the connecting piece.

In some embodiments, as shown in FIGS. 4 and 6 , the pin assembly 40 further includes a collection pin 404 , the collection pin 404 is electrically connected to the second circuit 306 , and the collection pin 404 penetrates through the housing 10 for It is electrically connected to the battery information collector 200 .

It should be noted that the structures of the acquisition pin 404 and the sampling pin 401 may be the same or different, and the connection method between the acquisition pin 404 and the second line 306 may be the same as that of the sampling pin 401 and the first line 303, and the acquisition The connection between the pin 404 and the mounting seat 402 , the ceramic seal 50 and the housing 10 can be the same as the connection between the sampling pin 401 and the mounting seat 402 , the ceramic seal 50 and the housing 10 , which is not repeated here.

In some embodiments, at least one of the sampling line 302 and the collecting line 308 is FFC (Flexible Flat Cable). With this arrangement, the manufacturing process of the FFC is relatively simple, which is beneficial to reduce costs. Of course, in other embodiments, at least one of the sampling line 302 and the sampling line 308 can also be a wire.

In some embodiments, as shown in FIG. 2 , the plurality of pole core groups 202 in the pole core string 20 are arranged along a first direction, the first direction being the length direction of the battery 100 , and the length of the battery 100 is 400mm-2500mm. Of course, in other embodiments, the plurality of pole core groups 202 in the pole core string 20 may also be arranged along the second direction, and the second direction is the thickness direction of the battery 100 . As shown in FIG. 2 , the first direction is the X direction in the figure, and the second direction is the Y direction in the figure.

In some embodiments, as shown in FIG. 3 , the battery 100 includes a plurality of pole core strings 20 that are electrically connected to each other, and the plurality of pole core strings 20 are arranged along a second direction, which is the thickness direction of the battery 100 . Of course, in other embodiments, the second direction can also be the length direction of the battery 100 .

It should be noted that the number of pole core strings 20 contained in the battery 100 can be set according to actual needs, and the number of pole core groups 202 contained in each pole core string 20 can be the same or different, and can be set according to actual needs. .

It can be understood that when the battery 100 includes a plurality of pole core strings 20, the pole core strings 20 can be connected in parallel, in series or in a mixed connection. As for the specific connection, it can be set according to actual needs.

For example, the pole core strings 20 are connected in series. In addition, the two pole core groups 202 located at the same end of the pole core string 20 in the longitudinal direction of the two adjacent pole core strings 20 are connected in series. The length of the pole core strings 20 extends along the first direction, and such arrangement can make the electrical connection paths between the pole core strings 20 relatively short, which is beneficial to reduce the internal resistance.

As shown in FIG. 2 , the battery 100 includes two pole core strings 20 connected in series, each pole core string 20 includes two pole core groups 202 , and two pole core groups 202 located at the same end in the first direction in the two pole core strings 20 are connected in series connection, that is, the bipolar core group 202 located at the rearmost end of the bipolar core string 20 in FIG. 2 is connected in series.

In some embodiments, as shown in FIGS. 7 and 8 , the pole core string 20 further includes a packaging bag 201 , and the pole core group 202 is packaged in the packaging bag 201 .

In some embodiments, as shown in FIG. 7 , the pole core string 20 includes one packaging bag 201, and the plurality of pole core groups 202 included in the corresponding pole core string 20 are packaged in the same packaging bag 201;

The pole core group 202 includes a pole core group main body 203 and a first electrode lead-out part 204 and a second electrode lead-out part 205 for extracting current, which are used to connect the first electrode lead-out part 204 and the second electrode lead-out part 204 of the two pole core groups 202 in series. The connection point of the electrode lead-out part 205 is located in the packaging bag 201 .

As shown in FIG. 7 , a packaging portion 206 is formed in the packaging bag 201 relative to the first electrode lead-out part 204 and/or the second electrode lead-out part 205 to isolate two adjacent pole core group bodies 203; At least one of the first electrode lead-out part 204 of one pole core group 202 and the second electrode lead-out part 205 of the other pole core group 202 is located in the encapsulation part 206 , and the first electrode of the sampling line 302 The end can extend into the package part 206 to be connected with the first electrode lead-out part 204 or the second electrode lead-out part 205 .

It can be understood that a through hole may be provided in the encapsulation part 206 , and the first end of the sampling wire 302 may be connected to the first electrode lead-out part 204 or the second electrode lead-out part 205 through the through hole. Alternatively, part of the sampling line 302 may be embedded in the package part 206 first, and the first end of the sampling line 302 may be connected to the first electrode lead-out part 204 or the second electrode lead-out part 205 .

In other embodiments, the first electrode lead-out part 204 of one pole core group 202 and the second electrode lead-out part 205 of the other pole core group 202 of the two pole core groups 202 connected in series are connected through a connecting piece. The chip is located in the encapsulation part 206, and the first end of the sampling wire 302 can extend into the encapsulation part 206 to be connected with the connecting chip.

The connection between the first end of the sampling wire 302 and the first electrode lead-out part 204 or the second electrode lead-out part 205 or the connecting piece may be welding, riveting, bonding or the like. For example, ultrasonic welding may be employed.

How to form the encapsulation portion 206 in the encapsulation bag 201 will be described in detail below. It should be noted that the encapsulation portion 206 can be formed in but not limited to the following ways:

In some embodiments, as shown in FIG. 8 and FIG. 9 , the packaging bag 201 includes two connecting parts 207 arranged opposite to each other, the packaging bag 201 has an inner space, and the two connecting parts 207 are joined at preset positions to connect the packaging bag 201 The inner space is divided into a plurality of sealed chambers 208 , and a pole core group 202 is arranged in the sealed chambers 208 .

The above-mentioned “preset position” can be understood as the space between two adjacent pole core group bodies 203 and the outer edges of the two connecting portions 207 . The packaging portion 206 can be formed by joining the two connecting portions 207 at the interval between two adjacent pole core group bodies 203 .

In some embodiments, the packaging bag 201 is formed by folding the integrally formed packaging film 209 in half along a predetermined folding line, and the portions of the packaging film 209 on both sides of the folding line are the two connecting portions 207 .

It can be understood that, the packaging bag 201 is formed by folding a piece of packaging film 209 in half, and the bonding process between the two connecting parts 207 can be omitted, thereby saving process and manufacturing costs.

In some embodiments, the two connecting portions 207 are two encapsulation films 209 . That is, the packaging bag 201 includes two packaging films 209 disposed opposite to each other, and each packaging film 209 is a connecting portion 207 .

In some embodiments, the cavity wall of the sealing chamber 208 includes two side walls disposed opposite to each other along the second direction, and at least one side wall of at least one sealing chamber 208 is recessed to the outside of the packaging bag 201 to form a recess 210, the recess The pit 210 is used to accommodate the pole core group 202 . The second direction is the thickness direction of the battery 100 .

It can be understood that the two connecting parts 207 constitute two side walls of the sealed chamber 208 that are oppositely arranged along the second direction, and at least one connecting part 207 is recessed to the outside of the packaging bag 201 to form a recess 210 , and the recess 210 may be The pole core group 202 provides a receiving space. When the two connecting parts 207 are formed with dimples 210, the dimples 210 formed on the two connecting parts 207 may be arranged opposite to each other, or may be arranged at intervals.

In the present application, the specific manner in which the two connecting parts 207 are joined at the preset position is not limited, and the two connecting parts 207 may be tied together at the joining position by a cable tie. In some embodiments, the two connecting portions 207 are thermally fused at predetermined locations. That is, the bonding position of the connecting portion 207 can be heated and melted, and then pressed together, without other parts, the interior of the packaging bag 201 can be divided into a plurality of sealed chambers 208, and the preparation process is relatively simple.

It should be noted that, in the above embodiment, the packaging bag 201 is not additionally provided with a liquid injection port, and the electrolyte can be injected before the two connecting parts 207 are completely joined. Of course, an additional liquid injection port may also be provided on the packaging bag 201, and after the two connecting portions 207 are joined at the preset positions, the electrolyte is injected through the separately provided liquid injection port.

In some embodiments, the connection between the first electrode lead-out part 204 of one pole core group 202 and the second electrode lead-out part 205 of the other pole core group 202 of the two pole core groups 202 connected in series is embedded in the two pole core groups 202 in series. The joint position corresponding to the connecting portion 207 . That is, the connection between the first electrode lead-out part 204 of one pole core group 202 and the second electrode lead-out part 205 of the other pole core group 202 in the two pole core groups 202 connected in series is embedded in the corresponding package part 206 Inside.

In practical applications, for example, as shown in FIG. 8 , a plurality of pole core groups 202 can be connected in series first, and then a whole encapsulation film 209 can be used to wrap the series connected pole core groups 202 . A plurality of pole core groups 202 are placed on a part of the encapsulation film 209 (or a plurality of dimples 210 can be opened on a part of the encapsulation film 209 in advance, and then a plurality of pole core groups 202 connected in series are placed in the corresponding dimples. 210), and then fold another part of the encapsulation film 209 in the direction of the pole core group 202, and then heat-melt the encapsulation film 209 in the two parts by hot-melt treatment, thereby connecting the multiple pole core groups connected in series. 202 is packaged in the same packaging bag 201 .

Wherein, the two connecting parts 207 are relatively positioned with the first electrode lead-out part 204 and/or the second electrode lead-out part 205 to isolate the two adjacent pole core group bodies 203, and the two adjacent pole core groups 202 At least one of the first electrode lead-out part 204 of one pole core group 202 and the second electrode lead-out part 205 of the other pole core group 202 is located at the engaging position. Through this embodiment, the main bodies 203 of the plurality of pole core groups can be isolated to prevent the electrolytes of the plurality of pole core groups 202 from circulating each other, the plurality of pole core groups 202 will not affect each other, and the The electrolyte in 202 will not be decomposed due to excessive potential difference, so as to ensure the safety and service life of the battery 100 .

In some embodiments, as shown in FIG. 10 , the pole core string 20 includes a plurality of packaging bags 201 , the pole core groups 202 are packaged in the packaging bags 201 in a one-to-one correspondence, and the pole core group 202 includes a first electrode lead-out part 204 and a second Two electrode lead-out parts 205 , at least one of the first electrode lead-out part 204 and the second electrode lead-out part 205 of the pole core group 202 extends out of the packaging bag 201 .

In the two pole core groups 202 connected in series, the first electrode lead-out part 204 of one pole core group 202 is connected to the second electrode lead-out part 205 of the other pole core group 202, and the first end of the sampling line 302 is connected to the first electrode Parts of the lead-out member 204 or the second electrode lead-out member 205 outside the packaging bag 201 are connected.

In other embodiments, the first electrode lead-out part 204 of one pole core group 202 and the second electrode lead-out part 205 of the other pole core group 202 of the two pole core groups 202 connected in series pass through the outside of the packaging bag 201 The first end of the sampling line 302 is connected to the connecting piece.

In some embodiments, the material of the packaging bag 201 may be PET (Polyethylene terephthalate, polyethylene terephthalate), polypropylene composite film or aluminum plastic film.

In some embodiments, the casing 10 is a metal casing, and the pole core string 20 is packaged in the casing 10 . In this way, the double sealing effect of the packaging bag 201 and the case 10 is beneficial to improve the sealing performance of the battery 100 .

As shown in FIG. 11 , in another aspect of the present application, a battery pack 300 is provided, which includes a battery information collector 200 and the above-mentioned battery 100 , and the battery information collector 200 is electrically connected to the battery 100 . In the battery pack 300 provided by the present application, in the battery 100 , the sampling assembly 30 and the pin assembly 40 are arranged in the casing 10 , and the circuit board 301 in the sampling assembly 30 can conduct the sampling line 302 for each pole core group 202 . sampling, and transmit the collected information to the battery information collector 200 through the sampling pins 401 in the pin assembly 40, so as to understand the working status of each pole core group 202 inside the battery 100, which is beneficial to improve the safety of the battery 100. performance, thereby improving the safety of the battery pack 300 .

In another aspect, as shown in FIG. 12 , the present application further provides an electric vehicle 400 , which includes a vehicle body and the above-mentioned battery pack 300 , and the battery pack 300 is fixed on the vehicle body by passing through. In the electric vehicle 400 provided by the present application, the battery pack 300 therein has higher safety, so that the electric vehicle 400 has higher safety in use.

In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

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

Although the embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the present application, The scope of the application is defined by the claims and their equivalents.

Claims

A battery, characterized in that the battery comprises:

case;

a pole core string, the pole core string is arranged in the housing, the pole core string includes a plurality of pole core groups connected in series; and,

A sampling assembly, the sampling assembly is arranged in the casing, the sampling assembly includes a circuit board, a plurality of protection components and a plurality of sampling lines, the circuit board is provided with a plurality of first circuits, the first The input end of the line is electrically connected with the corresponding pole core group through the corresponding sampling line, the output end of the first line is used for being electrically connected with the battery information collector, and the sampling line and the first line are provided with a the protection components.
The battery according to claim 1, wherein the protection component is a fuse.
The battery according to claim 2, wherein the fuse is integrally formed with the corresponding first circuit; or, the fuse is integrally formed with the corresponding sampling line.
The battery according to any one of claims 1-3, wherein the first line includes a first connection section and a second connection section, and the protection component is connected to the first line of the corresponding first line Between the connecting section and the second connecting section, the sampling line is connected with the first connecting section of the corresponding first line.
The battery according to any one of claims 1-4, characterized in that, the battery further comprises a pin assembly, and the pin assembly includes a plurality of sampling pins, and the sampling pins are used for penetrating all the The casing is used to electrically connect the output end of the corresponding first circuit with the battery information collector.
The battery according to claim 5, wherein the circuit board is fixedly connected to the pin assembly.
The battery according to claim 6, wherein a plurality of first pads and a plurality of second pads are further provided on the circuit board, and the first lines are connected to the corresponding first pads and the first pads. Between the two pads, the sampling line is welded to the corresponding first pad, and the sampling pin is welded to the corresponding second pad.
The battery according to any one of claims 5-7, characterized in that, the battery further comprises a ceramic seal, a plurality of the sampling pins are fixed on the ceramic seal, and the ceramic seal is fixed on the casing.
The battery according to claim 8, wherein the ceramic sealing member is provided with a plurality of through holes, and the sampling pins are fixed in the corresponding through holes.
The battery according to claim 8 or 9, characterized in that, the battery further comprises a connecting sleeve, and the ceramic sealing member is fixed on the casing through the connecting sleeve.
The battery according to claim 10, wherein a groove is formed on the outer side of the casing, a sampling through hole is formed on the bottom wall of the groove, and the connecting sleeve is fixed in the groove, and there are many Each of the sampling pins penetrates through the sampling through hole and the connection sleeve, and the ceramic seal is fixed to an end of the connection sleeve away from the housing.
The battery according to any one of claims 5-11, wherein the case comprises a cover plate and a case body having an opening, and the cover plate closes the opening of the case body to form a sealed container A cavity, the pole core is arranged in series in the accommodating cavity; a plurality of the sampling pins are fixed and penetrate through the cover plate.
The battery according to any one of claims 1-12, wherein a plurality of pole core groups in the pole core string are arranged along a first direction, and the first direction is a length direction of the battery , the length of the battery is 400mm-2500mm.
The battery according to any one of claims 1-13, wherein the pole core string further comprises a packaging bag, and the pole core group is packaged in the packaging bag.
A battery pack, characterized by comprising a battery information collector and the battery according to any one of claims 1-14, wherein the battery information collector is electrically connected to the battery.
An electric vehicle, characterized by comprising the battery pack according to claim 15 .