CN114361630A

CN114361630A - Battery, battery pack and electric vehicle

Info

Publication number: CN114361630A
Application number: CN202011030745.4A
Authority: CN
Inventors: 高健; 胡世超; 彭青波; 朱燕
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2020-09-27
Filing date: 2020-09-27
Publication date: 2022-04-15
Also published as: WO2022062608A1

Abstract

The application provides a battery, battery package and electric motor car, battery include casing, utmost point core cluster and sampling subassembly. The pole core cluster is arranged in the shell and comprises a plurality of pole core groups connected in series. The sampling assembly is arranged in the shell and comprises a circuit board, a plurality of protection components and a plurality of sampling lines, a plurality of first lines are arranged on the circuit board, the input ends of the first lines are electrically connected with the corresponding pole core groups through the corresponding sampling lines, and the output ends of the first lines are electrically connected with the battery information collector. The battery of the application has higher safety.

Description

Battery, battery pack and electric vehicle

Technical Field

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

Background

The power battery pack needs to acquire information such as temperature and/or voltage of the battery in the using process so as to know the current working condition of the battery, and further potential safety hazards caused by abnormal work of the battery are avoided. At present, a relatively common sampling structure in a battery pack is to arrange a Flexible Printed Circuit (FPC) on a battery module or a battery to collect information related to the battery.

In the related art, in order to increase the voltage of the battery, a plurality of pole cores connected in series are usually arranged in the battery, but the sampling structure cannot sample each pole core in the battery, and further cannot know the working state of each pole core. In addition, a safety protection device is not arranged in the battery, and great safety problems are brought to the use of the battery.

Disclosure of Invention

The present disclosure is directed to solving at least one of the problems in the prior art. To this end, in a first aspect of the present application, there is provided a battery comprising:

a housing;

the pole core string is arranged in the shell and comprises a plurality of pole core groups connected in series; and the number of the first and second groups,

the sampling subassembly, the sampling subassembly is located in the casing, the sampling subassembly includes circuit board, a plurality of protection components and parts and a plurality of sampling line, be equipped with a plurality of first circuits on the circuit board, the input of first circuit is connected with the utmost point core group electricity that corresponds through the sampling line that corresponds, the output of first circuit is used for being connected with battery information collector electricity.

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 line; or, the fuse and the corresponding sampling line are integrally formed.

In some embodiments of this application, first circuit includes first linkage segment and second linkage segment, protection components and parts are connected between the first linkage segment and the second linkage segment of the first circuit that correspond, the first linkage segment of sampling line and the first circuit that corresponds is connected.

In some embodiments of the present application, the battery further includes a pin assembly, the pin assembly includes a plurality of sampling pins, the sampling pins be used for running through in the output and the battery information collector of the first circuit that the casing corresponds with the electricity connection.

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

In some embodiments of this application, still be equipped with a plurality of first pads and a plurality of second pad on the circuit board, first circuit is connected between corresponding first pad and second pad, the welding of sampling line and corresponding first pad, the welding of sampling contact pin and corresponding second pad. In some embodiments of the present application, the battery further comprises a ceramic sealing member, the plurality of sampling pins being fixed to the ceramic sealing member, the ceramic sealing member being fixed to the housing.

In some embodiments of the present application, a plurality of through holes are formed in the ceramic sealing member, and the sampling pins are fixed in the corresponding through holes.

In some embodiments of the present application, the battery further includes a connection sleeve through which the ceramic sealing member is fixed to the case.

In some embodiments of this application, be equipped with the recess on the outside of casing, be equipped with the sampling through hole on the diapire of recess, the adapter sleeve is fixed in the recess, and is a plurality of the sampling contact pin run through in the sampling through hole with the adapter sleeve, ceramic seal is fixed in the adapter sleeve is kept away from the one end of casing.

In some embodiments of the present application, the housing includes a cover plate and a housing body having an opening, the cover plate closes the opening of the housing body to form a sealed accommodating cavity, and the pole piece string is disposed in the accommodating cavity; the sampling pins are fixed and penetrate 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, the first direction is a length direction of the battery, and the length of the battery is 400mm to 2500 mm.

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

In a second aspect of the present application, a battery pack is provided, which includes a battery information collector and any one of the above batteries, wherein the battery information collector is electrically connected to the batteries.

In a third aspect of the present application, there is provided an electric vehicle including the battery pack of any one of the above.

The beneficial effect of this application does: the battery of this application, set up the sampling subassembly in the casing, and the sampling subassembly includes the circuit board, a plurality of protection components and parts and a plurality of sampling line, be equipped with a plurality of first circuits on the circuit board, the input of first circuit is connected with the utmost point core group electricity that corresponds through the sampling line that corresponds, the output of first circuit is used for being connected with battery information collector electricity, circuit board accessible sampling line samples every utmost point core group like this, and convey the information that gathers to battery information collector, so that know the operating condition of each inside utmost point core group of battery, be favorable to improving the security that the battery used. And moreover, a protection component is arranged between the sampling line and the first line, and the protection component can play a role in safety protection on a circuit inside the battery, so that the use safety of the battery can be further improved.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

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

FIG. 2 is a schematic view of the housing body of FIG. 1 with the housing body omitted;

fig. 3 is an exploded view of a battery provided in an embodiment of the present application;

fig. 4 is an exploded view of a battery part structure provided in an embodiment of the present application;

fig. 5 is a sectional view of a battery part structure provided in an embodiment of the present application;

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

FIG. 7 is a schematic view of a pole core assembly enclosed in a common enclosure provided by an embodiment of the present application;

fig. 8 is a schematic view of an integrally formed packaging film forming packaging bag provided in an embodiment of the present application, wherein a concave pit is provided on one connecting portion;

fig. 9 is a schematic view of an integrally formed packaging film forming packaging bag provided in an embodiment of the present application, wherein two connecting portions are provided with pits;

fig. 10 is a schematic view of the pole core sets encapsulated in the encapsulation pockets in a one-to-one correspondence according to the embodiment of the present application;

fig. 11 is a schematic view of a battery pack provided by an embodiment of the present application;

fig. 12 is a schematic view of an electric vehicle provided in an embodiment of the present application.

Reference numerals:

100. a battery; 200. a battery information collector; 300. a battery pack; 400. an electric vehicle;

10. a housing; 101. a cover plate; 102. a housing body; 103. an opening; 104. an accommodating chamber; 105. a groove; 106. sampling through holes;

20. a pole piece string; 201. packaging the mixture in a bag; 202. a pole core group; 203. a pole core assembly body; 204. a first electrode lead-out member; 205. a second electrode lead-out member; 206. a packaging section; 207. a connecting portion; 208. sealing the chamber; 209. packaging the film; 210. a pit; 211. a first pole-core group; 212. a second pole core group;

30. a sampling component; 301. a circuit board; 302. sampling lines; 303. a first line; 3031. a first connection section; 3032. a second connection section; 304. a first pad; 305. a second pad; 306. a second line; 307. a signal acquisition element; 308. collecting a line; 309. protecting the components; 310. a first sampling line; 311. a second sampling line;

40. a pin assembly; 401. sampling contact pins; 402. a mounting seat; 403. mounting holes; 404. collecting contact pins;

50. a ceramic seal; 501. a through hole;

60. connecting sleeves;

70. an insulating member; 701. avoiding the hole.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to 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", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the present application.

As shown in fig. 1-10, the present application provides a battery 100 comprising a housing 10, a pole piece 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 shell 10, the sampling assembly 30 comprises a circuit board 301, a plurality of protection components 309 and a plurality of sampling lines 302, a plurality of first lines 303 are arranged on the circuit board 301, the input ends of the first lines 303 are electrically connected with the corresponding pole core groups 202 through the corresponding sampling lines 302, and the output ends of the first lines 303 are electrically connected with the battery information collector 200.

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

The battery 100 of the application, set up sampling assembly 30 in casing 10, and sampling assembly 30 includes circuit board 301, a plurality of protection components and parts 309 and a plurality of sampling line 302, be equipped with a plurality of first lines 303 on the circuit board 301, the input of first line 303 is connected with the utmost point core group 202 electricity that corresponds through the corresponding sampling line 302, the output and the battery information collection ware 200 electricity of first line 303 are connected, circuit board 301 accessible sampling line 302 samples every utmost point core group 202 like this, and convey the information of gathering (for example voltage and/or electric current) to battery information collection ware 200, so that know the operating condition of each inside utmost point core group 202 of battery 100, be favorable to improving the security that battery 100 used. Moreover, a protection component 309 is arranged between the sampling line 302 and the first line 303, and the protection component 309 can play a role of safety protection on a circuit inside the battery 100, so that the use safety of the battery 100 can be further improved.

In the present application, 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 leading out current, the first electrode lead-out part 204 and the second electrode lead-out part 205 for connecting the two pole core groups 202 in series can be electrically connected with the same sampling line 302, and the first electrode lead-out part 204 and the second electrode lead-out part 205 not for connecting the two pole core groups 202 in series are respectively electrically connected with the two sampling lines 302 corresponding to each other. By such an arrangement, the number of sampling lines 302 can be reduced, which is beneficial to saving cost.

Of course, the first electrode leading-out part 204 and the second electrode leading-out part 205 of each electrode core group 202 can also be arranged to be electrically connected with two sampling lines 302 in one-to-one correspondence; alternatively, the first electrode lead-out member 204 and the second electrode lead-out member 205 of the plurality of pole core groups 202 may be electrically connected to two sampling lines 302 corresponding to each other.

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, the first electrode leading-out part 204 of the first pole core group 211 is electrically connected to the first sampling line 310, and the second electrode leading-out part 205 of the first pole core group 211 and the first electrode leading-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 provided in 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 constitute 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 comprises one pole core, one of the first electrode lead-out part 204 and the second electrode lead-out part 205 is a positive pole lug, and the other is a negative pole lug; if the pole core group 202 comprises a plurality of pole cores, one of the first electrode lead-out part 204 and the second electrode lead-out part 205 is a composite tab formed by compounding and welding together positive pole tabs of the plurality of pole cores, and the other is a composite tab formed by compounding and welding together negative pole tabs of the plurality of pole cores.

In the present application, the pole core is a pole core commonly used in the field of power battery 100, and the pole core group 202 are internal components of the battery 100 and cannot be understood as the battery itself; the battery 100 referred to in the present application is an independent single battery, and cannot be simply understood as a battery module or a battery pack because it includes a plurality of pole pieces. In addition, the pole core in the application can be formed by winding or can be made in a lamination mode; generally, the pole core includes at least a positive pole piece, a separator, and a negative pole piece.

The battery 100 in the present application may be a liquid battery, i.e., a core containing an electrolyte, or a solid battery, in which a core contains a solid electrolyte or gel polymer electrolyte.

In some embodiments, protection component 309 is a fuse. Of course, the protection component 309 may also be a conductive sheet, and a weak area is arranged on the conductive sheet; alternatively, the protection component 309 may 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 perform an overcurrent protection function, so that the safety of the use of the battery 100 can be improved. Additionally, the fuse may be a serpentine fuse or a patch fuse.

In some embodiments, the fuses are integrally formed with the corresponding first lines 303; for example, the fuse is integrally formed with the first wiring 303 on the circuit board 301 by etching. Alternatively, the fuses are integrally formed with the corresponding sampling lines 302. The integration of the fuse with the first line 303 is advantageous in reducing the number of structural members and in simplifying the assembly.

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

As shown in fig. 4 and 6, the first line 303 includes a first connection segment 3031 and a second connection segment 3032, the protection component 309 is connected between the first connection segment 3031 and the second connection segment 3032 of the corresponding first line 303, and the sampling line 302 is connected to the first connection segment 3031 of the corresponding first line 303. That is, the sampling line 302 is connected to the corresponding protection component 309 through the first connection segment 3031 of the corresponding first line 303, and the second connection segment 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 circuit 303, and the fuse, the first connection segment 3031 and the second connection segment 3032 of the first circuit 303 are integrally formed.

In some embodiments, as shown in fig. 3 to 5, the housing 10 includes a cover plate 101 and a housing body 102 having an opening 103, the cover plate 101 closes the opening 103 of the housing body 102 to form a sealed accommodating cavity 104, and the pole piece string 20 is disposed in the accommodating cavity 104; a plurality of sampling pins 401 are secured to and extend through the cover plate 101.

In this application, shell body 102 all has opening 103 along the both ends of first direction, and apron 101 is equipped with two, and every apron 101 seals corresponding opening 103, and a plurality of sampling contact pins 401 are fixed and run through in same apron 101. Wherein the first direction is a length direction of the battery. As shown in fig. 3, the first direction is the X direction in the figure.

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

Further, in some embodiments, as shown in fig. 3 and fig. 6, the circuit board 301 is further provided with a plurality of first pads 304 and a plurality of second pads 305, the first lines 303 are connected between the corresponding first pads 304 and second pads 305, the sampling lines 302 are soldered to the corresponding first pads 304, and the sampling pins 401 are soldered to the corresponding second pads 305. In the present application, the sampling lines 302 correspond to the first pads 304 one to one, and the sampling pins 401 correspond to the second pads 305 one to one.

Wherein the first pad 304 is configured as an input of the first line 303 and the second pad 305 is configured as an output 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 a sheet shape, a first end of the sampling line is connected to the corresponding pole core group, and a second end of the sampling line 302 may be soldered on a surface of the corresponding first pad 304 to be electrically connected to the corresponding first line 303. The second pads 305 may be socket pads, that is, sockets are disposed in the second pads 305, and the sampling pins 401 may be inserted and soldered in the sockets to be electrically connected to the corresponding first lines 303 through the corresponding second pads 305. Of course, the first pads 304 may also be socket pads, and the second pads 305 may also be surface mount pads. The first pad 304 and the second pad 305 may be the same or different, and the specific form of the first pad 304 and the second pad 305 is not particularly limited in the present application.

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

In some embodiments, as shown in fig. 3 to 5, the pin assembly 40 further includes a mounting seat 402 disposed in the housing 10, wherein the mounting seat 402 is disposed on the plurality of sampling pins 401. It will be appreciated that the sampling pins 401 may be mounted to the mounting base 402 during assembly to facilitate securing the respective sampling pins 401 to the circuit board 301.

Specifically, the mounting base 402 is provided with a plurality of mounting holes 403, and the sampling pins 401 are correspondingly fixed in the mounting holes 403. And the inner and outer ends of the sampling pin 401 each extend out of the mounting hole 403.

It should be noted that the connection between the mounting base 402 and the sampling pin 401 can be, but is not limited to, interference fit, adhesion, welding, or injection molding or hot pressing. In addition, the sampling pins 401 may be secured in the mounting holes 403 in a one-to-one correspondence. Of course, it is also possible to fix a plurality of sampling pins 401 in one mounting hole 403, and the sampling pins 401 need to be insulated from each other.

In some embodiments, as shown in fig. 3-5, the cell 100 further comprises a ceramic seal 50, the plurality of sampling pins 401 being secured to the ceramic seal 50, the ceramic seal 50 being secured to the housing 10. That is, the plurality of sampling pins 401 are fixed to the housing 10 by the ceramic seal 50. The sealing performance of the connection between the sampling pin 401 and the housing 10 can be effectively ensured by the ceramic sealing member 50. As shown in fig. 4, the ceramic seal 50 is fixed to the lid plate 101.

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

The sampling pin 401 may be fixed to the through hole 501 by, but not limited to, welding, interference fit, adhesion, or the like. For example, the sampling pin 401 may be fixed in the through hole 501 by soldering.

As shown in fig. 3 to 5, the battery 100 further includes a connection sleeve 60, and the ceramic sealing member 50 is fixed to the case 10 by the connection sleeve 60. Specifically, the ceramic seal 50 is fixed to the cover plate 101 by a connecting sleeve 60.

It should be noted that the connection sleeve 60 and the housing 10, and the connection sleeve 60 and the ceramic seal 50 may be connected by, but not limited to, welding, interference fit, adhesion, etc. For example, the connection sleeve 60 is fixed to the housing 10 by laser welding, and the ceramic seal 50 is fixed to the connection sleeve 60 by brazing.

Further, as shown in fig. 4 and 5, a groove 105 is formed on the outer side of the housing 10, a sampling through hole 106 is formed in the bottom wall of the groove 105, the connection sleeve 60 is fixed in the groove 105, the sampling pin 401 penetrates through the sampling through hole 106 and the connection sleeve 60, and the ceramic sealing element 50 is fixed at one end of the connection sleeve 60 far away from the housing 10. The outside of the housing 10 refers to a side of the housing 10 facing away from the accommodating cavity 104. By fixing the connection sleeve 60 in the groove 105, the space occupied by the connection sleeve 60 on the outside can be reduced, which is advantageous for reducing the size of the battery 100. Specifically, the outer side of the cover plate 101 is provided with a groove 105, and the ceramic sealing element 50 is fixed at one end of the connecting sleeve 60 far away from the cover plate 101.

As shown in fig. 4 and 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, and the insulating member 70 is provided with an avoiding hole 701, where the avoiding hole 701 is used for avoiding the plurality of sampling pins 401.

As shown in fig. 3, 4 and 6, the circuit board 301 is further provided with a second line 306, the sampling assembly 30 further includes a signal collecting element 307 and a collecting line 308, and the signal collecting element 307 is electrically connected to the second line 306 through the collecting line 308.

The second trace 306 on the circuit board 301 may be, but is not limited to, a conductive metal foil, a conductive wire, or a conductive metal plating. The second circuit 306 may be disposed on the circuit board 301 by, but not limited to, bonding, soldering, etching, injection molding, hot pressing, electroplating, electroless plating, and the like. The second line 306 and the first line 303 may be the same or different, and the present application is not particularly limited thereto.

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 is understood that the signal acquisition element 307 may or may not be in contact with the pole core set 202. The present application is not particularly limited, and for example, the signal collecting element 307 may be attached to the pole core group main body 203, the first electrode lead-out member 204, the second electrode lead-out member 205, or the connecting sheet.

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

It should be noted that the structures of the collecting pin 404 and the sampling pin 401 may be the same or different, the connection manner between the collecting pin 404 and the second circuit 306 may be the same as the connection manner between the sampling pin 401 and the first circuit 303, and the connection manner between the collecting pin 404 and the mounting seat 402, between the ceramic sealing member 50 and the housing 10 may be the same as the connection manner between the sampling pin 401 and the mounting seat 402, between the ceramic sealing member 50 and the housing 10, and therefore, the description thereof is omitted.

In some embodiments, at least one of the sampling line 302 and the sampling line 308 is an FFC (Flexible Flat Cable). By the arrangement, the FFC is relatively simple in manufacturing process and beneficial to reducing the cost. Of course, in other embodiments, at least one of the sampling line 302 and the sampling line 308 may also be a conductive line.

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 is a length direction of the battery 100, and the length of the battery 100 is 400mm to 2500 mm. 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, which is the thickness direction of the battery 100. As shown in fig. 2, the first direction is an X direction in the drawing, and the second direction is a Y direction in the drawing.

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

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

It is understood that when the battery 100 includes a plurality of pole core strings 20, the pole core strings 20 may be connected in parallel, in series, or in series and in parallel, and how to connect them specifically, they may be set according to actual needs.

For example, the pole core strings 20 are connected in series. In addition, two pole core groups 202 located at the same end of the pole core string 20 in the length direction are connected in series in two adjacent pole core strings 20. The length of the pole core string 20 extends along the first direction, so that the electrical connection path between the pole core strings 20 is relatively short, and the internal resistance is favorably reduced.

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, that is, two pole core groups 202 located at the rearmost end in the two pole core strings 20 in fig. 2 are connected in series.

In some embodiments, as shown in fig. 7 and 8, the pole piece string 20 further includes a packaging bag 201, and the pole piece assembly 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 a 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 comprises a pole core group main body 203 and a first electrode leading-out part 204 and a second electrode leading-out part 205 for leading out current, and the connection part of the first electrode leading-out part 204 and the second electrode leading-out part 205 for connecting the two pole core groups 202 in series is positioned in the packaging bag 201.

As shown in fig. 7, a sealing part 206 is formed at a position opposite to the first electrode drawing part 204 and/or the second electrode drawing part 205 of the sealing bag 201 to separate the adjacent two pole core pack bodies 203; at least one of the first electrode drawing part 204 of one electrode core group 202 and the second electrode drawing part 205 of the other electrode core group 202 of the two electrode core groups 202 connected in series is positioned in the encapsulation part 206, and the first end of the sampling line 302 can extend into the encapsulation part 206 to be connected with the first electrode drawing part 204 or the second electrode drawing part 205.

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

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

The connection of the first end of the sampling line 302 to the first electrode lead-out member 204, the second electrode lead-out member 205, or the connection sheet may be welding, riveting, bonding, or the like. For example, ultrasonic welding may be employed.

As to how the enclosure 206 in the enclosure bag 201 is formed, as will be described in detail below, it should be noted that the enclosure 206 may be formed in the following manner, but is not limited thereto:

in some embodiments, as shown in fig. 8 and 9, the packaging bag 201 includes two connecting portions 207 disposed oppositely, the packaging bag 201 has an inner space, the two connecting portions 207 are joined at a predetermined position to divide the inner space of the packaging bag 201 into a plurality of sealed chambers 208, and the sealed chambers 208 are provided with the pole core assemblies 202.

The above-mentioned "preset position" may be understood as the interval between the adjacent two pole core assembly bodies 203 and the outer edge of the two connection parts 207. Wherein the two connecting portions 207 are joined at the interval between the two adjacent pole core assembly bodies 203 to form the package portion 206.

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

It is understood that the envelope bag 201 is formed by folding a sheet of the envelope film 209 in half, and a bonding process between the two connection portions 207 can be omitted, thereby saving process and manufacturing costs.

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

In some embodiments, the cavity wall of the sealed chamber 208 includes two sidewalls oppositely disposed along the second direction, at least one sidewall of at least one sealed chamber 208 is recessed toward the outside of the packaging bag 201 to form a recess 210, and the recess 210 is used for receiving the pole core group 202. Wherein the second direction is a thickness direction of the battery 100.

It is understood that two connecting portions 207 constitute two side walls of the sealed chamber 208 oppositely arranged along the second direction, and at least one connecting portion 207 is recessed to the outside of the packaging bag 201 to form a recess 210, and the recess 210 can provide a receiving space for the pole core group 202. When the concave recesses 210 are formed in both of the connecting portions 207, the concave recesses 210 formed in both of the connecting portions 207 may be disposed opposite to each other or may be disposed at intervals.

In the present application, the specific manner in which the two connecting portions 207 are engaged at the predetermined position is not limited, and the two connecting portions 207 may be tied together at the engaged position by a tie. In some embodiments, the two connection portions 207 are heat-fusion bonded at a predetermined position. That is, the joining position of the connecting portion 207 may be melted by heating and then pressed together, and the interior of the package bag 201 may be partitioned into the plurality of sealed chambers 208 without using other components, and the manufacturing process is relatively simple.

In the above embodiment, the injection port is not additionally provided in the package bag 201, and the electrolyte may be injected before the both connection portions 207 are completely joined. Of course, the pouch 201 may be provided with an additional filling opening, and after the connection portions 207 are joined at predetermined positions, the electrolyte may be filled through the separately provided filling opening.

In some embodiments, the connection position of the first electrode drawing part 204 of one electrode core group 202 and the second electrode drawing part 205 of the other electrode core group 202 in the two electrode core groups 202 connected in series is embedded at the corresponding joint position of the two connection parts 207. That is, the connection point of the first electrode drawing part 204 of one electrode core group 202 and the second electrode drawing part 205 of the other electrode core group 202 of the two electrode core groups 202 connected in series is embedded in the corresponding encapsulation part 206.

In practical applications, for example, as shown in fig. 8, a plurality of pole core groups 202 may be connected in series, and then the connected pole core groups 202 are wrapped by a whole piece of the packaging film 209, for example, the connected pole core groups 202 may be placed on a part of the packaging film 209 (or a plurality of recesses 210 may be formed in advance on a part of the packaging film 209, and then the connected pole core groups 202 are placed in the corresponding recesses 210), and then another part of the packaging film 209 is folded in half toward the pole core groups 202, and then the two parts of the packaging film 209 are heat-melted and combined by a heat melting process, so as to package the connected pole core groups 202 in the same packaging bag 201.

Wherein the two connecting parts 207 are coupled with the first electrode drawing part 204 and/or the second electrode drawing part 205 at opposite positions to separate the adjacent two-pole core pack main bodies 203, and at least one of the first electrode drawing part 204 of one pole core pack 202 and the second electrode drawing part 205 of the other pole core pack 202 of the adjacent two-pole core packs 202 is located at the coupling position. Through this kind of embodiment can be with keeping apart between a plurality of utmost point core group main parts 203, avoid the electrolyte of a plurality of utmost point core group 202 to circulate each other, can not influence each other between a plurality of utmost point core group 202, and the electrolyte in a plurality of utmost point core group 202 can not be because of the too big decomposition of potential difference, guarantees battery 100's security and life.

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, each pole core group 202 includes a first electrode leading-out part 204 and a second electrode leading-out part 205, and at least one of the first electrode leading-out part 204 and the second electrode leading-out part 205 of the pole core group 202 extends out of the packaging bag 201.

The first electrode lead-out member 204 of one electrode core group 202 in the two electrode core groups 202 connected in series is connected with the second electrode lead-out member 205 of the other electrode core group 202, and the first end of the sampling wire 302 is connected with the part of the first electrode lead-out member 204 or the second electrode lead-out member 205 outside the packaging bag 201.

In other embodiments, the first electrode lead-out member 204 of one electrode core group 202 and the second electrode lead-out member 205 of the other electrode core group 202 in the two electrode core groups 202 connected in series are connected through a connecting sheet located outside the packaging bag 201, and the first end of the sampling line 302 is connected with the connecting sheet.

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

In some embodiments, the housing 10 is a metal housing and the pole piece string 20 is enclosed within the housing 10. Thus, the sealing performance of the battery 100 is advantageously improved by the double sealing action of the packaging bag 201 and the case 10.

As shown in fig. 11, in another aspect of the present application, there is provided a battery pack 300 including the battery 100 described above and a battery information collector 200, the battery information collector 200 being electrically connected to the battery 100. The application provides a battery pack 300, battery 100 wherein, through set up sampling assembly 30 and contact pin subassembly 40 in casing 10, circuit board 301 accessible sampling line 302 in the sampling assembly 30 samples every utmost point core group 202, and convey the information that gathers to battery information collector 200 through sampling contact pin 401 in the contact pin subassembly 40, so that know the operating condition of each inside utmost point core group 202 of battery 100, be favorable to improving the security that battery 100 used, and then can improve battery pack 300's security.

In still 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, wherein the battery pack 300 is fixed on the vehicle body. The electric vehicle 400 provided by the application has the advantages that the battery pack 300 has high safety, so that the electric vehicle 400 has high use safety.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In the description herein, references to the description of the terms "embodiment," "particular embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above 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.

While 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 to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery, comprising:

a housing;

2. The battery of claim 1, wherein the protection component is a fuse.

3. The battery according to claim 2, wherein the fuse is integrally formed with the corresponding first wiring; or, the fuse and the corresponding sampling line are integrally formed.

4. The battery of claim 1, wherein the first circuit includes a first connection section and a second connection section, the protection component is connected between the first connection section and the second connection section of the corresponding first circuit, and the sampling line is connected with the first connection section of the corresponding first circuit.

5. The battery of claim 1, further comprising a pin assembly, wherein the pin assembly comprises a plurality of sampling pins, and the sampling pins are configured to penetrate through the housing to electrically connect the output end of the corresponding first line with the battery information collector.

6. The battery of claim 5, wherein the circuit board is fixedly connected to the pin assembly.

7. The battery of claim 6, wherein the circuit board further comprises a plurality of first pads and a plurality of second pads, the first circuit is connected between the corresponding first pads and the corresponding second pads, the sampling lines are soldered to the corresponding first pads, and the sampling pins are soldered to the corresponding second pads.

8. The cell defined in claim 5, further comprising a ceramic seal to which the plurality of sampling pins are secured, the ceramic seal being secured to the housing.

9. The battery of claim 8, wherein the ceramic seal member is provided with a plurality of through-holes, and the sampling pins are fixed in the corresponding through-holes.

10. The battery of claim 8, further comprising a connection sleeve through which the ceramic seal is secured to the housing.

11. The battery of claim 10, wherein a groove is formed on the outer side of the housing, a sampling through hole is formed in the bottom wall of the groove, the connecting sleeve is fixed in the groove, the sampling pins penetrate through the sampling through hole and the connecting sleeve, and the ceramic sealing element is fixed at one end of the connecting sleeve, which is far away from the housing.

12. The battery of claim 5, wherein the housing comprises a cover plate and a housing body with an opening, the cover plate closes the opening of the housing body to form a sealed accommodating cavity, and the pole piece string is arranged in the accommodating cavity; the sampling pins are fixed and penetrate through the cover plate.

13. The battery of claim 1, wherein the plurality of pole core groups in the pole core string are arranged in a first direction, the first direction being a length direction of the battery, and the length of the battery is 400mm to 2500 mm.

14. The battery of claim 1, wherein the pole piece string further comprises an encapsulation bag, and the pole piece group is encapsulated in the encapsulation bag.

15. A battery pack comprising a battery information collector and a battery as claimed in any one of claims 1 to 14, the battery information collector being electrically connected to the battery.

16. An electric vehicle comprising the battery pack according to claim 15.