CN114744374B - Battery and battery pack - Google Patents
Battery and battery pack Download PDFInfo
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- CN114744374B CN114744374B CN202110021163.8A CN202110021163A CN114744374B CN 114744374 B CN114744374 B CN 114744374B CN 202110021163 A CN202110021163 A CN 202110021163A CN 114744374 B CN114744374 B CN 114744374B
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- battery
- sampling
- cell
- cell strings
- cells
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/298—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the wiring of battery packs
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
- H01M50/51—Connection only in series
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
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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
Abstract
The invention provides a battery and a battery pack, wherein the battery comprises a shell, a sampling assembly arranged in the shell and two electric core strings electrically connected with each other; the battery cell strings comprise a plurality of battery cells which are sequentially connected in series, two battery cell strings are arranged side by side, a groove is formed between the two battery cell strings, the groove is located on the same side of the two battery cell strings, the sampling assembly comprises a sampling wire harness, the sampling wire harness comprises a plurality of sampling wires, the sampling wires are arranged side by side, the sampling wires are contained in the groove, and the sampling wires are correspondingly and electrically connected with the battery cells. The sampling wire harness of the battery provided by the invention is arranged in the groove of the battery core string in the shell, so that the height space of the battery is not occupied, and the arrangement of the battery is more reasonable.
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 increase the output voltage, the battery is internally provided with a plurality of cells connected in series, however, how to sample the plurality of cells and how to arrange a sampling structure for sampling the cells are problems to be solved at present.
Disclosure of Invention
The invention aims to provide a battery, which solves the technical problems of how to sample a plurality of battery cells in the battery and how to arrange sampling structures in the prior art.
The invention provides a battery, which is characterized in that the battery comprises
The sampling device comprises a shell, a sampling assembly arranged in the shell and two electric core strings electrically connected with each other; the battery cell strings comprise a plurality of battery cells which are sequentially connected in series, two battery cell strings are arranged side by side, a groove is formed between the two battery cell strings and positioned at the same side of the two battery cell strings,
the sampling assembly comprises a sampling wire harness, the sampling wire harness comprises a plurality of sampling wires, the sampling wires are arranged side by side, the sampling wires are contained in the grooves, and the sampling wires are correspondingly and electrically connected with the battery cells.
The sampling lines are arranged in parallel and are not on the same plane.
Wherein a plurality of the sampling lines are arranged in a stacked manner.
The plurality of sampling lines are arranged in a three-layer lamination mode, and the number of the three layers of sampling lines is distributed in a step mode.
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 a side surface and two opposite first surfaces connected with the side surface, and the side surface is connected with the first surfaces through cambered surfaces;
the first surfaces of the cell assemblies in the two cell strings are attached to each other, and the cambered surfaces of the cell assemblies in the two cell strings form the grooves; or an insulating plate is clamped between the first surfaces of the cell assemblies, which are opposite to each other, of the two cell strings, and the cambered surfaces of the cell assemblies, which are opposite to each other, of the two cell strings and the side edges of the insulating plate form the groove together.
The packaging bag comprises a sealing part, the sealing part is positioned on the side face of the battery cell assembly, the sealing part and the side face of the battery cell assembly enclose to form an accommodating space, and the accommodating space is communicated with the groove.
Wherein the two battery cell strings are connected in series, the two battery cell strings respectively comprise a head end and a tail end, the total number of the battery cells of the two battery cell strings is N, the sampling lines of the sampling wire harness are N+1, wherein N is an integer,
the sampling assembly comprises a circuit board positioned at the head end of the battery cell string, each sampling line 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 in the groove, the output section bends and extends towards one side of the battery cell string, which is away from the groove, relative to the main body,
the battery comprises a guide tab which is connected with two battery cells respectively positioned at the tail end in two battery cell strings, one battery cell of the two battery cells respectively positioned at the head end of 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, 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 strings,
the circuit board comprises two first welding pieces arranged at intervals, wherein the 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.
The connecting section of the sampling line is bent relative to the main body, and a supporting piece is arranged at the joint of the connecting section and the main body; or, the outer surface of the connecting section of the sampling line is wrapped with colloid so as to support the connecting section to bend relative to the main body.
The electrode leading-out sheets of the two cells are arranged between every two adjacent cells of each cell string, the N+1 sampling lines comprise second sampling lines in one-to-one correspondence with the connecting sheets, the sampling assembly comprises third welding sheets in one-to-one correspondence with the second sampling lines, the third welding sheets are connected to the connecting sections of the second sampling lines, and the third welding sheets are in welding conduction with the connecting sheets.
The embodiment of 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.
According to the battery provided by the invention, the plurality of battery cells are sampled through the plurality of sampling lines, and further the plurality of sampling lines are arranged in the groove between the two battery cell strings, so that the structure of the battery is not changed, the height space of the battery is not occupied completely, and the overall arrangement optimization of the battery is facilitated.
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 one embodiment of the battery of FIG. 1 with a sampling bundle mounted in a trench;
FIG. 4 is a schematic structural view of a circuit board and a portion of a sampling harness of the sampling assembly shown in FIG. 2;
FIGS. 5a and 5b are schematic views of a portion of the sampling harness shown in FIG. 2 including a second sampling line, illustrating two embodiments of the connection location of the connection section to the main body;
FIG. 6 is a schematic view of a portion of the sampling harness shown in FIG. 2 including a first sampling line;
FIG. 7 is a schematic diagram of a cell string of the battery shown in FIG. 1;
fig. 8 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.
The invention provides a battery, which comprises a shell, a sampling assembly and two electric core strings, wherein the sampling assembly is arranged in the shell; the battery cell strings comprise a plurality of battery cells which are sequentially connected in series, two battery cell strings are arranged side by side, a groove is formed between the two battery cell strings, the groove is positioned on the same side of the two battery cell strings,
the sampling assembly comprises a sampling wire harness, the sampling wire harness comprises a plurality of sampling wires, the sampling wires are arranged side by side, the sampling wires are contained in the grooves, and the sampling wires are correspondingly and electrically connected with the battery cells.
The battery provided by the invention samples the battery cells through the sampling lines, the sampling wire harness is arranged in the shell, so that the arrangement of the battery is more reasonable, each battery cell in the battery can be sampled, and further, the plurality of sampling lines are arranged in the groove between the two battery cell strings, so that the height space of the battery is not occupied completely, and the integral arrangement optimization of the battery pack and the automobile is facilitated. 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 installed inside the housing 10, and two battery strings 30; each cell string 30 includes a plurality of cells 31 connected in series in turn, two cell strings 30 are connected in series and two cell strings 30 are arranged 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. The sampling assembly 20 includes a plurality of sampling lines 24, a plurality of sampling lines 24 are arranged side by side, the sampling lines are accommodated in the grooves C, and the sampling lines 24 are correspondingly and electrically connected with the battery cells 31.
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.
In this embodiment, the opposite ends of the battery cell string 30 are a head end a and a tail end B. Wherein the total number of the battery cells 31 of the two battery cell strings 30 is N, where N is an integer greater than 2; the groove C extends along the length direction of the cell string 30 and connects the head end a and the tail end B. The head end a is the position of the end of the two electric cores of the two electric core strings 30 at one end, and the tail end B is the position of the end of the two electric cores of the two electric core strings 30 at the other end opposite to the head end. As shown in fig. 7, the direction from the head end to the tail end can be understood as the length direction of the cell string or the battery, the length direction refers to the X direction, and the Y direction is the thickness direction of the cell string or the battery.
Referring to fig. 2 and 4, the sampling assembly 20 includes a circuit board 21 located at a head end of the battery string 30 and a sampling harness 22 for sampling the battery cells 31. As shown in fig. 4, the sampling harness 22 includes a fixing portion 23 and n+1 sampling lines 24, n+1 sampling lines 24 are arranged side by side, the fixing portion is located at one side of the head end a and is opposite to the circuit board, one ends of two battery cells 31 of the two battery cell strings 30, which are respectively located at the head end a and are not connected to adjacent battery cells, are electrically connected to the circuit board 21, and the sampling harness 22 is installed in the groove C.
Specifically, 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, each sample line 24 includes a main body 241, an output section 242 and a connection section 243, where the main body 241 is located in the groove, and the output section 242 bends and extends toward a side of the cell string 30 facing away from the groove 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, n+1 output sections 242 of the sampling lines 24 are welded to the circuit board 21 and are connected to each other, and n+1 connection sections 243 of the sampling lines 24 are correspondingly connected to the plurality of electric cells 31. The corresponding connection may be that two series-connected cells share one sampling line, or each cell corresponds to two sampling lines except the cells at the head end and the tail end, and the two sampling lines are set according to actual needs.
Further, referring to fig. 3, n+1 of the sampling lines 24 are arranged in parallel and not on the same plane. Taking the case that the main bodies of all the sampling lines 24 are placed in the grooves C together as an example, the n+1 sampling lines 24 are arranged in parallel and not on the same plane, in this embodiment, n+1 sampling lines are arranged in a stacked manner, and may be stacked in two or more layers, and the number of each layer may be equal or unequal. Further, n+1 sampling lines 24 are arranged in a three-layer stacked manner, and the number of the three sampling lines is distributed in a stepwise manner. In this embodiment, 8 battery cells are taken as an example, the number of sampling lines 24 is 9, the number of main bodies of the 9 sampling lines 24 is three, the number of layers of the main bodies positioned on the bottom wall of the groove C is at least 2, the middle layer is 3, the top layer is 4, the three layers of the sampling lines 24 are distributed in a stepped manner, and the cross-sectional shape of the groove C is met, so that the side surface of the battery cell string is not protruded after the sampling wire harness 22 is installed, and the height of the whole battery is not increased. And the wire harnesses at other positions are gradually reduced, so that the wire harnesses can be arranged according to actual conditions.
In one embodiment, the cross section of the sampling wire bundle 22 formed by n+1 sampling wires is V-shaped. It will be appreciated that 9 of the sampling lines 24 are divided into four layers, with 1 being the lowest layer.
In one embodiment, the cross-section of the sampling wire bundle 22 formed by n+1 sampling wires is circular. It will be appreciated that the 9 sampling lines 24 are circular, and may be arranged in two or three rings.
In one embodiment, the cross-section of the sampling harness 22 has the same outer profile shape as the cross-section profile shape of the channel C. As long as n+1 of the sampling lines 24 can be reasonably arranged so that the outer profile shape of the cross section of the sampling line bundle is the same as the cross section profile shape of the groove C, the same here including a certain tolerance range and the like. The whole height of the battery is not affected in the groove C as long as the sampling wire harness can be contained.
In an embodiment, n+1 sampling lines are arranged in parallel on the same plane, so long as they can be completely or partially accommodated by the grooves.
In the embodiment of the invention, the sampling wires of the sampling wire harness 22 are reasonably arranged, the sampling wire harness 22 is arranged in the groove by utilizing the groove on the battery cell string on the premise of not changing the structures of the battery cell string and the battery, and the sampling wire harness can be completely or partially accommodated in the height, so that the space of the sampling wire harness occupying the height direction of the battery is avoided or reduced, and the reasonable layout of the battery and the battery pack can be realized.
As shown in fig. 7 and 8, in the present embodiment, the plurality of battery cells 31 of each battery cell string 30 are arranged in a row, and the number of battery cells of two battery cell strings 30 is the same and symmetrically arranged, specifically, one-to-one and side-by-side. The groove C is located between two cell strings 30 and on the same side, and the same side of the two cell strings 30 refers to the direction of the side facing the same direction. The cell string 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 D. 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 smaller than the outer diameter of the sampling line, the inner space is not required to be occupied, compared with the prior art that the sampling wire harness is arranged 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 to a limited extent. 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 cell assemblies in the two cell strings 30, which are opposite to each other, are directly attached, and the cambered surfaces D of the cell assemblies in the two cell strings 30, which are opposite to each other, form the groove C. In addition, the wall of the groove C may be an arc surface D and a part 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. 7, 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, 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 D. 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. In the following description of the connection manner between the sampling line and the battery cell, the battery cell 31 is directly described, and the battery cell is the battery cell in the battery cell assembly.
In this embodiment, as shown in fig. 2 and 4, 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 position where the output sections 242 are connected to the main body. 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 bent to form the output sections 242, 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. In other embodiments, the fixing portion may be a ribbon, or the fixing portion may be a structural adhesive.
The free end of the output section 242 of each sampling line 24 is a metal joint 242a, the fixing portion 23 is in a plate-shaped structure, the output sections 242 of the n+1 sampling lines 24 are fixed in the fixing portion, and the n+1 metal joints 242a extend out of the fixing portion 23. In this embodiment, the position where the output section 242 is connected to the main body 241 is a transition section (not shown), and the output section 242 is connected to the main body 241 through the transition section, and the transition section is fixed in the fixing portion 23. In other embodiments, the output section 242 may be directly connected to the body 2411. 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.
Of course, in other embodiments, the fixing portion 23 includes a fixing body and a bending edge (not shown) disposed at one end of the fixing body (not shown), the output sections 242 of the n+1 sampling lines 24 are fixed in the fixing body, and the n+1 metal connectors 242a extend out of the fixing portion 23 through the bending edge.
As shown in fig. 4, 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 5B, the connection sections 243 of the n+1 sampling lines 24 are distributed along the length direction of the cell string 30, i.e. the direction from the head end a to the tail end B. 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 part between the connecting section 243 and the main body 241. As shown in fig. 6, specifically, 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 at the connection between the first section 243a and the main body 241. In this embodiment, the first section 243a is connected to the second section 243b in a bending manner, and the supporting member 246 is formed on the first section 243 a. 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 plate 246 is a sheet body, and is coated on the first section 243a of the connecting section 243, so that the connecting section 243 is kept at a certain bending angle, and when the sampling harness is placed along the length direction of the cell string 30, the connecting section 243 can smoothly extend into the gap between the ends of two adjacent cells 31 to be connected with the tab, and the connecting section 243 is positioned so as to limit the distance between the connecting section 243 and the main body 241 of the sampling line 24, thereby being more convenient for welding with the cells. In another embodiment, as shown in fig. 5a, the outer surface of the connecting section 243 of each sampling line 24 is coated with a glue to support the connecting section 243 from bending relative to the main body 241, i.e. the sampling lines 24 are directly encapsulated on the outer surface of the connecting section 243, so as to form a glue layer coated on the connecting section 243.
Further, as shown in fig. 2 and 6, the battery includes a conductive tab 25, where the conductive tab 25 connects two cells connected in series at the tail end B of two cell strings 30, one of the two cells of the two cell strings 30 respectively located at the head end a 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), and 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 with the circuit board 21 through the first electrode lead-out piece 33 and the second electrode lead-out piece, the sampling wire harness 22 is welded with the circuit board through the output section 242 fixed by the fixing portion 23, the sampling wire harness 22 is welded and conducted with the cell conducting piece 25 at the tail end of the cell string 30 through the second welding piece 26 on the first sampling wire 24a, and it can be ensured that the sampling wire harness 22 and the circuit board 21 can sample information of the first end cells and the tail end cells of the cell string 30. The first sampling line 24a is electrically connected with the conducting tab 25 of the cell string 30 through laser welding between the second welding tab 26, and is reliable in structure and low in impedance. 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, 5a, 5b and 6, each two adjacent cells 31 in the cell string 30 are connected by a connecting piece 34, n+1 of the sampling lines 24 include second sampling lines 24b corresponding to the connecting outgoing 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. 5a, 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 electric cores 31 respectively positioned at the head end in the two electric core strings are directly connected with the circuit board, the first electrode lead-out piece 33 and the second electrode lead-out piece which are far away from the head end of the two electric cores 31 are connected with the sampling wire 24, the two electric cores 31 respectively positioned at the tail end B in the two electric core strings are electrically connected through the guide tab 25 and realize the serial connection of the two electric core strings, the electric signal is directly collected through the first sampling wire 24a, and the electrode lugs which are far away from the tail end and comprise the tail end B are connected through the guide tab, and the sampling is respectively carried out through the second sampling wire 24, wherein the collecting wire 24c is positioned in one of the gaps. The circuit board 21 is further provided with 11 holes, which are matched with pins of sampling pins on the first cover plate 12 to be described below and are soldered by spot soldering, so that transmission of sampling signals is realized.
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, sampling pins are 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 openings of the casing 10, and the sampling pins are electrically connected with the circuit board 21 and are used for transmitting sampling signals to the battery information collector. 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.
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 arranged in the shell and two electric core strings electrically connected with each other; the battery cell strings comprise a plurality of battery cells which are sequentially connected in series, two battery cell strings are arranged side by side, a groove is formed between the two battery cell strings, the groove is positioned on the same side of the two battery cell strings,
the sampling assembly comprises a sampling wire harness, the sampling wire harness comprises a plurality of sampling wires, the sampling wires are arranged side by side, the sampling wires are contained in the grooves, and the sampling wires are correspondingly and electrically connected with the battery cells.
2. The battery of claim 1, wherein a plurality of the sampling lines are arranged in parallel side-by-side relationship and not on the same plane.
3. The battery of claim 2, wherein a plurality of the sampling lines are arranged in a stacked manner.
4. The battery of claim 3, wherein a plurality of the sampling lines are arranged in a three-layer stack, and the number of the three layers of the sampling lines is in a stepwise distribution.
5. The battery of any one of claims 1-4, wherein the string of cells comprises a plurality of pouches within which the cells are correspondingly packaged to form a cell assembly;
the battery cell assembly comprises a side surface and two opposite first surfaces connected with the side surface, and the side surface is connected with the first surfaces through cambered surfaces;
the first surfaces of the cell assemblies in the two cell strings are attached to each other, and the cambered surfaces of the cell assemblies in the two cell strings form the grooves; or an insulating plate is clamped between the first surfaces of the cell assemblies, which are opposite to each other, of the two cell strings, and the cambered surfaces of the cell assemblies, which are opposite to each other, of the two cell strings and the side edges of the insulating plate form the groove together.
6. The battery of claim 5, wherein the packaging pouch comprises a seal located on a side of the cell assembly, the seal and the side of the cell assembly enclosing to form a receiving space, the receiving space in communication with the channel.
7. The battery according to any one of claims 1 to 4, wherein two of the cell strings are connected in series, the two cell strings include a head end and a tail end, respectively, and the total number of the cells of the two cell strings is N, the sampling lines of the sampling harness are n+1, wherein N is an integer,
the sampling assembly comprises a circuit board positioned at the head end of the battery cell string, each sampling line 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 in the groove, the output section bends and extends towards one side of the battery cell string, which is away from the groove, relative to the main body,
the battery comprises a guide tab which is connected with two battery cells respectively positioned at the tail end in two battery cell strings, one battery cell of the two battery cells respectively positioned at the head end of 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, 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 strings,
the circuit board comprises two first welding pieces arranged at intervals, wherein the 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.
8. The battery according to claim 7, wherein the connecting section of the sampling line is bent relative to the main body, and a supporting member is provided at the connection part of the connecting section and the main body; or, the outer surface of the connecting section of the sampling line is wrapped with colloid so as to support the connecting section to bend relative to the main body.
9. The battery of claim 7, wherein two adjacent cells in the cell string are connected by 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 connected to connecting sections of the second sampling lines, and the third welding sheets are welded and conducted with the connecting sheet.
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.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110021163.8A CN114744374B (en) | 2021-01-07 | 2021-01-07 | Battery and battery pack |
| PCT/CN2021/090549 WO2022147930A1 (en) | 2021-01-07 | 2021-04-28 | Battery and battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110021163.8A CN114744374B (en) | 2021-01-07 | 2021-01-07 | Battery and battery pack |
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| Publication Number | Publication Date |
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| CN114744374A CN114744374A (en) | 2022-07-12 |
| CN114744374B true CN114744374B (en) | 2023-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110021163.8A Active CN114744374B (en) | 2021-01-07 | 2021-01-07 | Battery and battery pack |
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| Country | Link |
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| CN (1) | CN114744374B (en) |
| WO (1) | WO2022147930A1 (en) |
Families Citing this family (1)
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|---|---|---|---|---|
| CN115528391A (en) * | 2022-09-23 | 2022-12-27 | 欣旺达惠州动力新能源有限公司 | Electric core group and voltage acquisition method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107431160A (en) * | 2015-06-19 | 2017-12-01 | 株式会社Lg 化学 | Box and the battery module with the box |
| KR20190112469A (en) * | 2018-03-26 | 2019-10-07 | 에이치엘그린파워 주식회사 | Battery cartridge and battery module containing the same |
| 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 |
| CN211879432U (en) * | 2020-04-03 | 2020-11-06 | 比亚迪股份有限公司 | Battery module |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201800002773A1 (en) * | 2018-02-16 | 2019-08-16 | Ferrari Spa | VEHICLE BATTERY PACK |
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- 2021-01-07 CN CN202110021163.8A patent/CN114744374B/en active Active
- 2021-04-28 WO PCT/CN2021/090549 patent/WO2022147930A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107431160A (en) * | 2015-06-19 | 2017-12-01 | 株式会社Lg 化学 | Box and the battery module with the box |
| KR20190112469A (en) * | 2018-03-26 | 2019-10-07 | 에이치엘그린파워 주식회사 | Battery cartridge and battery module containing the same |
| 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 |
| CN211879432U (en) * | 2020-04-03 | 2020-11-06 | 比亚迪股份有限公司 | Battery module |
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| WO2022147930A1 (en) | 2022-07-14 |
| CN114744374A (en) | 2022-07-12 |
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