CN114744375B - Battery and battery pack - Google Patents
Battery and battery pack Download PDFInfo
- Publication number
- CN114744375B CN114744375B CN202110021164.2A CN202110021164A CN114744375B CN 114744375 B CN114744375 B CN 114744375B CN 202110021164 A CN202110021164 A CN 202110021164A CN 114744375 B CN114744375 B CN 114744375B
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- Prior art keywords
- sampling
- battery
- battery cell
- cells
- circuit board
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Battery Mounting, Suspending (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention provides a battery and a battery pack, the battery includes: the battery cell comprises a shell, a sampling assembly and a battery cell string, wherein the sampling assembly and the battery cell string are arranged in the shell; the battery cell cluster includes a plurality of battery cells of series connection in proper order, sampling assembly is including being located the circuit board of battery cell cluster one end and being used for the sampling pencil to the battery cell sampling, sampling pencil includes fixed part and many sampling lines, many sampling lines set up side by side, and each sampling line includes the main part, output section and linkage segment, the both ends that the main part is relative are located to output section and linkage segment, the main part is located one side of battery cell cluster, the opposite side bending extension of main part orientation battery cell cluster of output section, the fixed part is fixed in the junction of main part and output section, the output section and the circuit board welding of many sampling lines are switched on, the linkage segment and the corresponding connection of a plurality of battery cells of many sampling lines. The sampling wire harness provided by the invention can be conveniently connected with a circuit board, and is beneficial to improving the assembly efficiency.
Description
Technical Field
The invention relates to the field of batteries, in particular to a battery and a battery pack.
Background
At present, along with the continuous development of new energy automobile industry, power battery provides main driving force for it, and wherein power battery package needs information such as the temperature and/or the voltage of gathering the battery in the use to know the current working condition of battery, avoid appearing the potential safety hazard because of the unusual work of battery. In order to improve the voltage, the battery is internally connected with a plurality of battery cores in series, and a sampling circuit and a circuit board are required to be arranged for sampling the battery cores, but the structure design of the existing sampling circuit causes inconvenience in connection with the circuit board, so that the assembly efficiency is affected, and the cost is increased.
Disclosure of Invention
The invention aims to provide a battery, which solves the technical problems that the assembly efficiency is affected and the cost is increased due to the fact that a sampling structure in the prior art is inconvenient to connect with a circuit board.
The present invention provides a battery including: the battery cell comprises a shell, a sampling assembly and a battery cell string, wherein the sampling assembly and the battery cell string are arranged in the shell;
the battery cell string comprises a plurality of battery cells which are sequentially connected in series,
the sampling assembly comprises a circuit board positioned at one end of the battery cell string and a sampling wire harness for sampling the battery cells,
the sampling wire harness comprises a fixing part and a plurality of sampling wires, the sampling wires are arranged side by side, each sampling wire comprises a main body, an output section and a connecting section, the output section and the connecting section are arranged at two opposite ends of the main body, the main body is positioned at one side of the battery cell string, the output section bends and extends towards the other side of the battery cell string relative to the main body,
the fixing part is fixed at the junction of main part with the output section, a plurality of the output section of sampling line with the circuit board welding is switched on, a plurality of the connecting section of sampling line with a plurality of the electric core corresponds to be connected.
The output sections of the sampling lines are aligned and arranged in parallel, and the fixing parts are injection molded at the connecting positions of the main bodies of the sampling lines and the output sections.
The sampling wire harness further comprises a supporting piece, the connecting section of the sampling wire is bent relative to the main body, and the supporting piece is arranged at the joint of the connecting section and the main body.
Wherein, support piece injection molding in the junction of sampling line's junction with the main part.
Wherein the free end of the output section of the sampling line is a metal joint, the fixing part comprises a fixing body and a bending edge arranged at one end of the fixing body, the sampling line comprises a transition section, the output section is connected with the main body through the transition section, the transition section is fixed in the fixing body, the metal joint extends out of the fixing part from the bending edge,
the circuit board comprises metal welding spots corresponding to the output sections of the sampling lines one by one, the bending edges are propped against the surface of the circuit board, which is provided with the metal welding spots, and the metal joints are respectively welded on the metal welding spots to realize the electric connection of the sampling wire harness and the circuit board.
The battery cell string comprises a plurality of packaging bags, and the battery cells are correspondingly packaged in the packaging bags to form a battery cell assembly; the battery cell assembly comprises an end face and a side face connected with the end face, the end face and the side face are connected through an arc face, the fixing body is connected with the bending edge through an arc face, the fixing portion is located on the side face, adjacent to the battery cell assembly of the circuit board, of the battery cell string, and the arc face is attached to the arc face.
Wherein the number of the battery cell strings is two, the two battery cell strings are arranged side by side and are connected in series, each battery cell string comprises a head end and a tail end, the total number of the battery cells of the two battery cell strings of the battery cell string is N, the number of the sampling lines of the sampling wire harness is N+1, wherein N is an integer,
the battery comprises a guide tab which is connected with two electric cores respectively positioned at the tail end in two electric core strings, one electric core of the two electric cores respectively positioned at the head end in the two electric core strings is provided with a first electrode lead-out piece, the other electric core is provided with a second electrode lead-out piece, the first electrode lead-out piece and the second electrode lead-out piece are used for leading out the total current of the electric core strings,
the circuit board comprises two first welding pieces arranged at intervals, wherein N+1 sampling lines comprise first sampling lines, the connecting ends of the first sampling lines are connected with second welding pieces, the first electrode lead-out piece and the second electrode lead-out piece are respectively welded and conducted with the two first welding pieces, and the second welding pieces are welded and conducted with the conducting pieces.
Two adjacent electric cores in the electric core string are connected in series through connecting sheets, the N+1 sampling lines comprise second sampling lines corresponding to the connecting sheets one by one, the sampling assembly comprises third welding sheets corresponding to the second sampling lines one by one, the third welding sheets are fixedly connected to connecting sections of the second sampling lines, and the third welding sheets are in welding conduction with the connecting sheets.
The battery comprises a first cover plate provided with a sampling needle, the shell comprises an opening, the battery cell string and the sampling assembly are arranged in the shell, the first cover plate is packaged on the opening of the shell, and the circuit board is electrically connected with the sampling needle and used for outputting information acquired by the sampling assembly.
The invention provides a battery pack, which comprises a battery information collector and a battery, wherein the battery information collector is electrically connected with the battery.
The battery provided by the invention is arranged in the battery shell through the sampling wires to sample each battery core, so that the working state of each battery core is conveniently controlled, the safety of the battery is improved in the use process, the output sections of the sampling wires are bent relative to the main body, and the fixing parts are fixed at the connecting positions of the main body and the output sections, so that the sampling wires are kept in a certain bending state, so that the sampling wires are conveniently welded with the circuit board, and further the assembly efficiency is improved, and the cost is saved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic exploded view of a battery according to an embodiment of the present invention;
FIG. 2 is a schematic view of a sampling assembly of the battery shown in FIG. 1;
FIG. 3 is a schematic view of the circuit board and a portion of the sampling harness of the sampling assembly shown in FIG. 2;
FIG. 4 is a schematic view of a portion of the sampling harness shown in FIG. 2 including a second sampling line;
FIG. 5 is a schematic view of a portion of the sampling harness shown in FIG. 2 including a first sampling line;
FIG. 6 is a schematic diagram of a cell string of the battery shown in FIG. 1;
fig. 7 is a schematic view of an assembled structure of the battery shown in fig. 1, in which a case is not shown.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
In the description of the present specification, reference to an embodiment of the terms "embodiment," specific embodiment, "" example, "etc," "a 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 embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
An embodiment of the present invention provides a battery including: the battery cell comprises a shell, a sampling assembly and a battery cell string, wherein the sampling assembly and the battery cell string are arranged in the shell; the battery cell string comprises a plurality of battery cells which are sequentially connected in series, the sampling assembly comprises a circuit board positioned at one end of the battery cell string and a sampling wiring harness used for sampling the battery cells, the sampling wiring harness comprises a fixing part and a plurality of sampling wires, the sampling wires are arranged side by side, each sampling wire comprises a main body, an output section and a connecting section, the output section and the connecting section are arranged at two opposite ends of the main body, the main body is positioned at one side of the battery cell string, the output section is opposite to the main body and extends towards the other side of the battery cell string in a bending mode, the fixing part is fixed at the joint of the main body and the output section, the output sections of the sampling wires are welded and conducted with the circuit board, and the connecting sections of the sampling wires are correspondingly connected with the battery cells.
The battery provided by the invention is arranged in the battery shell through the sampling wires to sample each battery core, so that the working state of each battery core is conveniently controlled, the safety of the battery is improved in the use process, the output sections of the sampling wires are bent relative to the main body, and the fixing parts are fixed at the connecting positions of the main body and the output sections, so that the sampling wires are kept in a certain bending state, so that the sampling wires are conveniently welded with the circuit board, and further the assembly efficiency is improved, and the cost is saved. And moreover, the sampling wire harness adopts the structural design, so that the arrangement of the battery cells is tidier and more reasonable. The following describes in detail specific examples.
Referring to fig. 1, in an embodiment of the present invention, the battery 100 includes a housing 10, a sampling assembly 20 and a battery string 30, wherein the sampling assembly 20 is installed inside the housing 10; in this embodiment, two battery cell strings are taken as an example for illustration, each battery cell string 30 includes a plurality of battery cells 31 sequentially connected in series, two battery cell strings 30 are connected in series, and the total number of battery cells 31 of the two battery cell strings 30 is N, where N is an integer greater than 2. Opposite ends of the battery cell string 30 are a head end a and a tail end B. The head end a is a position where end portions of two electric cores of the two electric core strings 30 located at one end are located, and the tail end B is a position where end portions of two electric cores of the two electric core strings 30 located at the other end opposite to the head end a are located.
The battery cell 31 in the present application may be a structure formed by winding or stacking a positive electrode sheet, a separator, and a negative electrode sheet. The direction from the head end to the tail end is understood as the length direction of the battery cell string or the battery cell, and as shown in fig. 6, the length direction refers to the X direction, and the Y direction is the thickness direction of the battery cell string or the battery cell.
Referring to fig. 2 and 3, the sampling assembly 20 includes a circuit board 21 at one end of the battery string and a sampling harness 22 for sampling the battery cells 31. Specifically, the head end a is located on one side of the circuit board 21, and the sampling harness 22 includes a fixing portion 23 and n+1 sampling lines 24, as shown in fig. 3.N+1 of the sampling lines 31 are arranged side by side, and each of the sampling lines 24 includes a main body, an output section, and a connection section; in this embodiment, a sample line is taken as an example to specifically describe, each sample line 24 includes a main body 241, an output section 242 and a connection section 243, the output section 242 and the connection section 243 are disposed at opposite ends of the main body 241, the main body 241 is located at one side of the two battery cell strings 30, and the output section 242 bends and extends towards the other side of the battery cell strings 30 relative to the main body 241. The fixing portion 23 is fixed at the connection position between the main body 241 and the output section 242, the output sections 242 of the plurality of sampling lines 24 are welded to the circuit board 21 and are electrically connected, and the connection sections 243 of the plurality of sampling lines 24 are correspondingly connected to the plurality of battery cells 31.
Specifically, the output section 242 and the connecting section 243 are formed by extending opposite ends of the main body 241, and the output section 242 is bent with respect to the main body 241. The fixing part 23 is positioned at the head end A; the output section 242 of the n+1 sampling lines 24 is welded to and conducted with the circuit board 21, and the electrode of the cell string 30, which is located at the head end a and is not connected with other cells, is electrically connected with the circuit board 21, and the connecting section 243 of the n+1 sampling lines 24 is used for correspondingly connecting the other cells 31 of the cell string 30 and the electrode of the cell located at the head end and not connected with the adjacent cells. The corresponding connection may be that two series-connected cells share one sampling line, or one cell corresponds to one sampling line, or each other cell except the first end and the tail end corresponds to two sampling lines.
The casing 10 is a rectangular hollow casing, in this embodiment, openings are formed at opposite ends of the casing 10, the battery includes a first cover plate 12 and a second cover plate 15, a sampling needle is disposed on the first cover plate 12, the battery cell string 30 and the sampling assembly 20 are mounted in the casing 10, the first cover plate 12 and the second cover plate 15 are packaged on the opening of the casing 10, and the sampling needle is electrically connected with the circuit board 21 and is used for outputting information collected by the sampling assembly. The housing 10 is integral with the first cover plate 12 and the second cover plate 15, and contains the cell string 30 and the sampling assembly 20 therein. In other embodiments, only one end of the housing 10 is provided with an opening over which the first cover plate 12 is placed.
In this embodiment, as shown in fig. 3, the output sections 242 of the n+1 sampling lines 24 are aligned and arranged in parallel, and the fixing portion 23 is injection molded at a connection portion between the output sections 242 and the main body 241. Specifically, the output sections 242 of the n+1 sampling lines are firstly arranged in a line in the mold, then the colloid in a molten state is injected into the mold for injection molding, the colloid forms the fixing part 23 after cooling, the end part of the main body is simultaneously bent to form the output sections 242 in the forming process, and a plurality of sampling lines are simultaneously bent in the same fixing part 23 for injection molding, so that the processing technology is simplified and the precision is ensured. Of course, the output section 242 may be bent with respect to the main body 242 and then injection molded.
The free end of the output section 242 of each sampling line 24 is a metal joint 242a, the fixing portion 23 includes a fixing body 231 and a bending edge 232 disposed at one end of the fixing body 231, the output sections 242 of the n+1 sampling lines 24 are fixed in the fixing body 231, and the n+1 metal joints 242a extend out of the fixing portion 23 from the bending edge 232. In this embodiment, the connection position between the output section 242 and the main body 241 is a transition section (not shown) that is fixed in the fixing body 231. The fixing portion in this embodiment is convenient for limiting the distance between the output sections between the sampling wires, and is also beneficial to controlling the welding distance between the metal connector 242a of the sampling wire harness and the circuit board 21.
As shown in fig. 3, the circuit board 21 includes metal solder joints 210 corresponding to the output sections of the sampling wires 24 one by one, the bent edges 232 are abutted against the surface of the circuit board 21 provided with the metal solder joints 210, and the metal connectors 242a are respectively welded on the metal solder joints 210 to realize the electrical connection between the sampling wire harness 22 and the circuit board 21, wherein the direct welding can save a connector used conventionally for plugging, and can save cost.
In this embodiment, a safety structure (not shown) is further disposed on the surface of the circuit board 21 welded to the sampling harness, and in some embodiments, the safety structure is a fuse. Of course, the safety structure can also be a conducting plate, and a weak area is arranged on the conducting plate; alternatively, the safety structure may be a protection structure formed by its own circuit structure. When the current of the circuit inside the battery exceeds a threshold value, the safety structure can play a role in overcurrent protection, so that the use safety of the battery can be improved. In addition, the fuse may be a serpentine fuse or a patch fuse.
Further, referring to fig. 2 and 4, the connection sections 243 of the n+1 sampling lines 24 are distributed along the length direction of the cell string 30, which can be understood as the head-to-tail direction. The sampling harness further comprises a supporting member 246, the connecting section 243 of the sampling wire 24 is bent and arranged relative to the main body 241, and the supporting member 246 is arranged at the connection position of the connecting section 243 and the main body 241. As shown in fig. 6, in particular, the connecting section 243 includes a first section 243a connected to the main body 241 and a second section 243b connected to the first section 243a at an angle, and the supporting member 246 is fixed to the first section 243 a. In this embodiment, the first section 243a and the second section 243b are bent at an angle of 90 degrees. Specifically, the supporting member 246 is a plastic plate, and is formed by injection molding after the connecting section 243 is bent, which can be understood as bending the connecting section relative to the main body and then injection molding in a mold, and each sampling line 24 is separately injection molded, so that the bending is convenient for injection molding. The supporting member 246 is a sheet-shaped body, and is wrapped at the connection position between the connection section 243 and the main body 241, so that the connection section 243 is positioned at a bending angle, and when the sampling harness is placed along the length direction of the cell string 30, the connection section 243 can smoothly extend into the gap between the ends of two adjacent cells 31 to be connected with the tab. In other embodiments, the outer surface of the connecting section 243 may be directly encapsulated to form an adhesive layer wrapped on the connecting section 243 or at the connection between the connecting section 243 and the main body, so as to limit the distance between the connecting section 243 and the main body 241 of the sampling line 24, thereby facilitating the welding with the battery cell. Further, as shown in fig. 2 and 5, the battery includes a conductive tab 25, the conductive tab 25 connects two cells located at the tail end B of the two cell strings 30, one of the two cells located at the head end a of the two cell strings 30 is provided with a first electrode lead-out member 33, and the other cell is provided with a second electrode lead-out member (not shown), where the first electrode lead-out member 33 and the second electrode lead-out member are used for leading out the total current of the cell strings. The first electrode lead-out member 33 may be a positive electrode tab of the battery cell of the head end a, and the second electrode lead-out member may be a negative electrode tab of the battery cell of the head end B. Alternatively, the first electrode lead 33 may be a negative electrode tab of the battery cell of the head end a, and the second electrode lead may be a positive electrode tab of the battery cell of the head end B. In other embodiments, the first electrode lead 33 and the second electrode lead may be lead tabs connected to tabs. The positive electrode lugs and the negative electrode lugs of the battery cell are distributed on two opposite sides of the battery cell. In this embodiment, the first electrode lead-out member 33 and the second electrode lead-out member are two tabs of the battery cell 31 located at the head end of the battery cell string 30 and not connected to other battery cells.
The circuit board 21 includes two first bonding pads 212 arranged at intervals; the n+1 sampling lines 24 include a first sampling line 24a, a second welding tab 26 is connected to a connection section 243 of the first sampling line 24a, the first electrode lead-out member 33 and the second electrode lead-out member are respectively welded to and conducted with the two first welding tabs 26, and the second welding tab 26 is welded to and conducted with the conducting tab 25. The first end cells of the two cell strings 30 are connected to the circuit board 21 through the first electrode lead-out member 33 and the second electrode lead-out member, and the sampling wire harness 22 is welded to the circuit board through the output section 242 fixed by the fixing portion 23. The first sampling line 24a is electrically connected, structurally reliable and low in impedance by laser welding between the second welding tab 26 and the conducting tab 25. In this embodiment, the circuit board 21 includes two conductive wires 211 disposed at intervals, and the first bonding pad 212 is electrically connected to the circuit board 21 through the conductive wires 211. In other embodiments, the first bonding pad 212 is directly bonded to the circuit board 21.
Further, as shown in fig. 4, 5 and 6, two adjacent cells 31 in the cell string 30 are connected in series through a connecting piece 34, n+1 of the sampling lines 24 include second sampling lines 24b corresponding to the connecting pieces 34 of the N cells 31 one by one, the sampling assembly 20 includes third welding pieces 27 corresponding to the second sampling lines 24b one by one, the third welding pieces 27 are fixedly connected to the connecting sections of the second sampling lines 24b, and the third welding pieces 27 are used for being welded and conducted with the connecting pieces 34.
Specifically, a connecting piece 34 is disposed between two adjacent cells 31 in the same cell string, which can be understood that a gap between two adjacent cells 31 is correspondingly provided with the connecting piece 34, the connecting piece 34 is connected with the tabs of the cells on two sides of the gap, and the second sampling line 24b is welded with the connecting piece 34 through the third welding tab 27 and electrically connected with the connecting piece 34 (the second sampling line 24b is conducted with the cells) for collecting electric signals on two ends of the cells.
Referring again to fig. 2, the sampling wire bundles 22 are arranged in a row of n+1 sampling wires, and the connection sections 243 are disposed at positions corresponding to the gaps between two adjacent cells 31, that is, the connection pieces 34, along the length direction of the cell strings 30. The length of the second sampling line 24b from the head end to the tail end gradually extends along with the extending direction of the cells of the cell string, and the first sampling line 24a connected with the conducting sheet 25 is longest, which can be understood that the cells located at the head end a are arranged in a first row, and the second sampling lines 24b between the first row of cells and the second row of cells are shortest, and the second sampling lines 24b in the middle position are set to be long and short according to the connecting sheets 34, so that the lengths of the second sampling lines 24b and the first sampling lines 24a corresponding to the connecting sheets 34 of the N cells 31 are in a stepwise change. In this embodiment, the sampling harness 22 samples signals for each of the battery cells 31 between the head end and the tail end, so as to achieve accurate sampling of the battery.
Further, as shown in fig. 4, the sampling assembly 20 further includes an information collecting element 28, n+1 sampling lines 24 include a collecting line 24c, the information collecting element 28 is connected to and conducted with a connection section of the collecting line 24c, and the information collecting element 28 is adhered to a battery cell located between a head end and a tail end of the battery cell string so as to collect physical information of the battery. Specifically, the information collecting element 28 is attached to a tab of the battery cell located in the middle position of the battery cell string 30, and the signal collecting element is at least one of a temperature sensing element, a humidity sensing element, a pressure sensing element and an odor sensing element; in this embodiment, the signal acquisition element is a temperature sensing element, and is configured to acquire temperature information of the current core string.
Referring to fig. 2, in the present embodiment, N is 8, that is, the number of the cells of the cell strings 30 is 4, the total number of the cells of the two groups of cell strings is 8, the number of the sampling lines in the corresponding sampling harness 22 is 9, and the cells of each cell string 30 form 3 gaps. The first electrode lead-out piece 33 and the second electrode lead-out piece at one end of the two battery cells 31 respectively positioned at the head end in the two battery cell strings are directly connected with the circuit board, and the first electrode lead-out piece 33 and the second electrode lead-out piece of the two battery cells 31 far away from the head end are connected with the sampling line. Two battery cells 31 respectively located at the tail end B in the two battery cell strings are electrically connected through the guide tab 25 and are connected in series, electric signals are directly collected through the first sampling line 24a, the battery cells are located in 3 gaps, two battery cells comprising the tail end B are far away from the electrode lugs at the tail end and are connected through the guide tab, and then the second sampling line 24 is respectively sampled through 3 pairs, wherein the collecting line 24c is located in one of the gaps. The circuit board 21 is also provided with 11 holes, which are matched with pins of sampling pins on the first cover plate 12 and are soldered by spot soldering to realize transmission of sampling signals.
In this embodiment, referring to fig. 6 and fig. 7, the plurality of cells 31 of each cell string 30 are arranged in a row, and the number of the cells of the two cell strings 30 is the same and symmetrically arranged, specifically, one-to-one and side-by-side. A groove C is formed between the two cell strings 30, and the groove C is located on the same side of the two cell strings 30 and extends along the length direction of the cell strings 30.
Further, the cell string 30 includes a plurality of packages 40, and the cells 31 are correspondingly packaged in the packages 40 to form a cell assembly. The cell assembly comprises two opposite end faces 311, two opposite side faces 312 and two opposite first surfaces 310 connecting the side faces 312, wherein the side faces 312 are connected with the first surfaces 310 through cambered surfaces. The two first surfaces 310 are opposite surfaces of the cell assembly in the thickness direction of the cell string, the two side surfaces 312 are opposite surfaces of the cell assembly in the height direction of the cell string, and the two end surfaces 311 are opposite surfaces of the cell assembly in the length direction of the cell string. An insulating board is sandwiched between the first surfaces 310 of the cell assemblies in the two cell strings 30, as shown in fig. 3, and the cambered surfaces D of the cell assemblies in the two cell strings 30 opposite to each other and the side edges of the insulating board 2 together form the groove C. The n+1 sampling lines of the sampling wire harness are arranged in the groove C and are positioned in the shell 10, the depth of the groove is coincident with the outer diameter of the sampling lines, and the sampling wire harness does not occupy excessive space, so that compared with the prior art, the sampling wire harness is placed on the outer surface of the shell, the space of the battery in the height direction can be saved, and the volume energy density of the battery can be improved. It will be appreciated that the walls of the channel C include the arc D and the sides of the insulating plate, or alternatively, the walls of the channel C include the arc D, a portion of the first surface 310 and the sides of the insulating plate. Wherein the side of the insulating plate refers to the side of the insulating plate.
In another embodiment, unlike the above embodiment, the first surfaces 30 of the two cell strings 30, which are opposite to each other, are directly attached, and the cambered surfaces of the two cell strings, which are opposite to each other, form the groove C. It will be appreciated that the walls of the groove C may be curved surfaces or curved surfaces D and portions of the first surface 310.
It should be noted that, the first surface 310, the end surface 311, and the side surface 312 of the cell assembly may be understood as an outer surface of the package 40.
Further, as shown in fig. 6, the packaging bag 40 includes a sealing portion 41, the sealing portion 41 is located on the side surface 312 of the battery cell assembly, and the sealing portion 41 and the side surface 312 of the battery cell assembly enclose to form an accommodating space, and the accommodating space is communicated with the groove C. Therefore, the accommodating space can also accommodate part of sampling lines, which is beneficial to improving the space utilization rate. The material of the packaging bag may be an aluminum plastic film or polypropylene, and the present application is not particularly limited. The seal 41 is formed to close the opening of the package 40.
It should be noted that, the battery cell 31 includes a first electrode and a second electrode (not shown), the plurality of battery cells 31 in the battery cell string 30 are arranged along a preset direction, the first electrode and the second electrode are distributed on two opposite sides of the battery cell 31 along the preset direction, and the first electrode and the second electrode extend out from the package bag 40. The first electrode and the second electrode can be understood as a positive electrode tab and a negative electrode tab. The preset direction may be the length direction of the cell string, that is, the direction from the head end to the tail end. The above embodiments and the following examples refer to the cells in the cell assembly. In another embodiment of the present invention, unlike the above embodiment, the cell string 30 is one, and the cell string 30 includes N cells 31 sequentially connected in series, where N is an integer greater than 2. Opposite ends of the battery cell string 30 are a head end a and a tail end B. The head end a is a position of an end of the battery cell string 30, where the end is located at one end. The sampling harness 22 includes a fixing portion 23 and N sampling lines 24, N sampling lines 31 are arranged side by side, and each sampling line 24 includes a main body, an output section, and a connection section. The connection sections of the N sampling lines 24 are used for electrically connecting with the battery cells 31 of the battery cell string 30. The fixing part 23 is fixed at the connection position of the output sections of the N sampling lines 24 and the main body, and the fixing part 24 is positioned at the head end A; the output sections of the N sampling lines 24 are welded to and conducted with the circuit board 21, one end of the cell string 30 located at the head end a, which is not connected with the adjacent cell, is electrically connected with the circuit board 21, and the connection sections of the N sampling lines 24 are used for electrically connecting the other cells 31 of the cell string 30, which are not connected with the circuit board 21.
The invention also provides a battery pack, which comprises a battery information collector and the battery 100, wherein the battery information collector is electrically connected with the battery. The battery 100 that the battery package adopted in this embodiment, set up sampling pencil and information acquisition element in shell 10 inside, sampling pencil 22 is connected with circuit board 21, can carry out the electric signal sampling to every electric core 31 through circuit board 21 and sampling pencil 22 to can sample the electric core temperature of mid position, give the information transfer who gathers battery information acquisition ware through the circuit board in order to detect the operating condition of each electric core of the inside battery of battery package, be favorable to improving the security that battery 100 used, and then can improve the security of battery package.
The invention also provides an electric automobile, which comprises an automobile body and at least one battery pack, wherein the battery pack is fixed on the automobile body. The battery pack of the electric vehicle has higher safety, so that the electric vehicle has higher use safety.
The foregoing disclosure is illustrative of the preferred embodiments of the present invention, and is not to be construed as limiting the scope of the invention, as it is understood by those skilled in the art that all or part of the above-described embodiments may be practiced with equivalents thereof, which fall within the scope of the invention as defined by the appended claims.
Claims (10)
1. A battery, the battery comprising:
the sampling device comprises a shell, a sampling assembly and two battery cell strings, wherein the sampling assembly and the two battery cell strings are arranged in the shell;
along the thickness direction of the battery cell strings, two battery cell strings are arranged side by side and connected in series, each battery cell string comprises a plurality of battery cells which are sequentially connected in series, one battery cell of the two battery cells which are respectively positioned at the head end in the two battery cell strings is provided with a first electrode lead-out piece, the other battery cell is provided with a second electrode lead-out piece, and the first electrode lead-out piece and the second electrode lead-out piece are used for leading out the total current of the battery cell string;
the sampling assembly comprises a circuit board positioned at one end of the battery cell string and a sampling wire harness for sampling the battery cells,
the sampling wire harness comprises a fixing part and a plurality of sampling wires, the sampling wires are arranged side by side, each sampling wire comprises a main body, an output section and a connecting section, the output section and the connecting section are arranged at two opposite ends of the main body, the main body is positioned at one side of the battery cell string, the output section bends and extends towards the other side of the battery cell string relative to the main body, the free end of the output section is a metal joint,
the fixing part is fixed at the joint of the main body and the output section, and the connecting sections of the sampling lines are correspondingly connected with the battery cells;
the circuit board comprises metal welding spots and two first welding pieces, wherein the metal welding spots correspond to the output sections one by one, the first welding pieces are arranged at intervals, a plurality of metal joints are welded on the metal welding spots respectively to realize the electric connection of the sampling lines and the circuit board, and the first electrode lead-out piece and the second electrode lead-out piece are welded with the two first welding pieces respectively and are communicated.
2. The battery of claim 1, wherein the output segments of the plurality of sampling lines are aligned and arranged in parallel, and the fixing portion is injection molded at a connection between the body and the output segments of the plurality of sampling lines.
3. The battery of claim 1, wherein the sampling harness further comprises a support member, the connecting section of the sampling harness is bent relative to the main body, and the support member is arranged at the joint of the connecting section and the main body.
4. A battery according to claim 3, wherein the support is injection molded at the junction of the sampling wire and the body.
5. The battery according to claim 2, wherein the fixing portion includes a fixing body and a bending edge provided at one end of the fixing body, the sampling line includes a transition section, the output section is connected with the main body through the transition section, the transition section is fixed in the fixing body, the metal connector extends out of the fixing portion from the bending edge, and the bending edge abuts against a surface of the circuit board provided with a metal welding spot.
6. The battery of claim 5, wherein the string of cells includes a plurality of pouches within which the cells are correspondingly packaged to form a cell assembly; the battery cell assembly comprises an end face and a side face connected with the end face, the end face and the side face are connected through an arc face, the fixing body is connected with the bending edge through an arc face, the fixing portion is located on the side face, adjacent to the battery cell assembly of the circuit board, of the battery cell string, and the arc face is attached to the arc face.
7. The battery of any one of claims 1-6, wherein each of the cell strings comprises a head end and a tail end, the total number of cells of the two cell strings is N, the sampling line of the sampling wire harness is n+1, wherein N is an integer, the battery comprises a guide tab connecting two cells respectively located at the tail ends of the two cell strings,
the N+1 sampling lines comprise first sampling lines, the connecting ends of the first sampling lines are connected with second welding pieces, and the second welding pieces are welded with the conducting pieces and are conducted.
8. The battery according to claim 7, wherein two adjacent cells in the cell string are connected in series through a connecting sheet, n+1 sampling lines comprise second sampling lines in one-to-one correspondence with the connecting sheet, the sampling assembly comprises third welding sheets in one-to-one correspondence with the second sampling lines, the third welding sheets are fixedly connected to connecting sections of the second sampling lines, and the third welding sheets are in welding conduction with the connecting sheet.
9. The battery of claim 1, wherein the battery comprises a first cover plate provided with a sampling needle, the housing comprises an opening, the cell string and the sampling assembly are arranged in the housing, the first cover plate is packaged on the opening of the housing, and the circuit board is electrically connected with the sampling needle and used for outputting information collected by the sampling assembly.
10. A battery pack comprising a battery information collector and a battery as claimed in any one of claims 1 to 9, said battery information collector being electrically connected to said battery.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110021164.2A CN114744375B (en) | 2021-01-07 | 2021-01-07 | Battery and battery pack |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110021164.2A CN114744375B (en) | 2021-01-07 | 2021-01-07 | Battery and battery pack |
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| CN114744375A CN114744375A (en) | 2022-07-12 |
| CN114744375B true CN114744375B (en) | 2023-08-08 |
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| CN115621677B (en) * | 2022-12-19 | 2023-10-17 | 比亚迪股份有限公司 | Sampling structure, battery and vehicle |
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| CN211743281U (en) * | 2019-11-22 | 2020-10-23 | 比亚迪股份有限公司 | Battery, battery module, battery pack and electric vehicle |
| CN212303837U (en) * | 2020-06-29 | 2021-01-05 | 江西星盈科技有限公司 | Lithium ion battery module and bus bar assembly thereof |
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2021
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| KR20120012078A (en) * | 2010-07-30 | 2012-02-09 | 주식회사 씨엔플러스 | Protecting circuit board of battery pack and battery bpack having the same |
| CN206471435U (en) * | 2016-12-28 | 2017-09-05 | 上海航天电源技术有限责任公司 | A kind of battery module sampling wire harness |
| CN108258065A (en) * | 2018-03-09 | 2018-07-06 | 天合光能股份有限公司 | A kind of photovoltaic cell component with integrated circuit plate |
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| CN114744375A (en) | 2022-07-12 |
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