WO2022147930A1

WO2022147930A1 - Battery and battery pack

Info

Publication number: WO2022147930A1
Application number: PCT/CN2021/090549
Authority: WO
Inventors: 郭永明; 何平; 张中林; 周燕飞; 郎晓强
Original assignee: 比亚迪股份有限公司
Priority date: 2021-01-07
Filing date: 2021-04-28
Publication date: 2022-07-14
Also published as: CN114744374B; CN114744374A

Abstract

A battery (100), the battery (100) comprising a housing (10), and a sampling assembly (20) and two electrically connected cell strings (30) that are mounted inside the housing (10); each cell string (30) comprises a plurality of cells (31) connected in series sequentially, the 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 at the same side end of the two cell strings (30); and the sampling assembly (20) comprises a sampling wire harness, the sampling wire harness comprises a plurality of sampling wires (24), the sampling wires (24) are accommodated in the groove (C), and the sampling wires (24) are correspondingly electrically connected to the cells (31).

Description

Batteries and battery packs

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of the Chinese patent application number "202110021163.8" filed by BYD Co., Ltd. on January 7, 2021, with the application name "Battery and Battery Pack".

technical field

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

Background technique

At present, with the continuous development of the new energy vehicle industry, the battery pack is used as a power source to provide electrical energy for the drive motor. The battery pack needs to collect information such as the temperature and/or voltage of the battery during use to understand the multiple batteries in the battery pack. Current working conditions to avoid potential safety hazards due to abnormal battery operation. In order to increase the output voltage of the battery, a plurality of cells in series are arranged inside the battery. However, how to sample the plurality of cells and how to arrange the sampling structure for sampling the cells are problems that need to be solved at present.

SUMMARY OF THE INVENTION

The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a battery, which does not need to change the structure of the battery on the premise of sampling multiple cells in the battery, which is beneficial to the overall arrangement and optimization of the battery.

A battery is applied, comprising: a casing, a sampling assembly installed inside the casing, and two battery cell strings that are electrically connected; The core strings are arranged side by side, a groove is formed between the two battery core strings and is located at one end of the two battery core strings on the same side, the sampling assembly includes a sampling wire bundle, and the sampling wire bundle includes a plurality of sampling wires, so The sampling lines are accommodated in the grooves, and the sampling lines are electrically connected with the battery cells in one-to-one correspondence.

As a result, the battery samples multiple cells at the same time through multiple sampling lines, and further, multiple sampling lines are arranged in the groove between the two cell strings, without changing the structure of the battery itself, and does not occupy any space at all. The height space of the battery is more conducive to the optimization of the overall arrangement of the battery.

A battery pack includes a battery information collector and the battery, and the battery information collector is electrically connected to the battery.

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

Description of drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily understood from the following description of embodiments in conjunction with the accompanying drawings, wherein:

1 is a schematic exploded view of the structure of a battery provided by an embodiment of the present application;

FIG. 2 is a schematic structural diagram of the sampling assembly of the battery shown in FIG. 1;

3 is a schematic diagram of an embodiment of the sampling harness of the battery shown in FIG. 1 being installed in a groove;

4 is a schematic structural diagram of the circuit board and part of the sampling wiring harness of the sampling assembly shown in FIG. 2;

Fig. 5a and Fig. 5b are partial structural schematic diagrams of the sampling wire harness shown in Fig. 2 including the second sampling wire, wherein two embodiments of the connection position of the connecting section and the main body are shown;

6 is a schematic diagram of a partial structure including a first sampling line of the sampling wire harness shown in FIG. 2;

FIG. 7 is a schematic structural diagram of a cell string of the battery shown in FIG. 1;

FIG. 8 is a schematic view of the assembled structure of the battery shown in FIG. 1 , wherein the casing is not shown;

FIG. 9 is a schematic diagram of a battery pack provided by an embodiment of the present application.

Detailed ways

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

In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that The device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as a limitation of the present application.

It should be noted that the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. Further, in the description of the present application, unless otherwise specified, "plurality" means two or more.

The present application provides a battery. The battery pack 1000 includes a casing, a sampling assembly installed inside the casing, and two battery cell strings that are electrically connected; the battery cell string includes a plurality of battery cells connected in series, and the two battery cell strings are arranged side by side, A groove is formed between the two cell strings, and the groove is located at one end of the two cell strings on the same side,

The sampling assembly includes a sampling wire harness, the sampling wire harness includes a plurality of sampling lines, the plurality of sampling lines are arranged side by side, the sampling lines are accommodated in the grooves, and the sampling lines are electrically connected to the battery cells correspondingly.

The battery provided by this application samples the cells through the sampling line, and the sampling wire harness is arranged inside the casing, which makes the arrangement of the battery more rational, and can sample each cell inside the battery, and furthermore, there are multiple sampling lines. Arranged in the groove between the two battery cell strings, it does not occupy the height space of the battery at all, which is more conducive to the overall arrangement optimization of the battery pack 1000 and the car. The following specific embodiments are used for detailed description.

Referring to FIG. 1 , in an embodiment of the present application, a battery 100 includes a casing 10 , a sampling assembly 20 mounted inside the casing 10 , and two battery cell strings 30 ; each battery cell string 30 includes a plurality of battery cells 31 connected in series in sequence , the two cell strings 30 are connected in series and arranged side by side, a groove C is formed between the two cell strings 30 , and the groove C is located at one end of the two cell strings 30 on the same side. The sampling assembly 20 includes a plurality of sampling lines 24 arranged side by side, the sampling lines are accommodated in the groove C, and the sampling lines 24 are electrically connected to the cells 31 in a one-to-one correspondence.

It should be noted that 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 string 30 are the head end A and the tail end B. The total number of cells 31 in the two cell strings 30 is N, where N is an integer greater than 2; the groove C extends along the length direction of the cell strings 30 and connects the head end A and the tail end B. The head end A is the position of the ends of the two cells at one end of the two cell strings 30 , and the tail end B is the end of the two cells at the other end of the two cell strings 30 opposite to the head end. location. 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 battery, the length direction refers to the X direction, and the Y direction is the thickness direction of the cell string or battery.

Please refer to FIG. 2 and FIG. 4 together. The sampling assembly 20 includes a circuit board 21 located at the head end of the cell string 30 and a sampling wire harness 22 for sampling the cells 31 . As shown in FIG. 4 , the sampling wire harness 22 includes a fixed part 23 and N-1 sampling lines 24. The N-1 sampling lines 24 are arranged side by side. The fixed part is located on one side of the head end A and is opposite to the circuit board. The ends of the two cells 31 respectively located at the head end A of the string 30 that are not connected to the adjacent cells are electrically connected to the circuit board 21 , and the sampling wire harness 22 is installed in the groove C.

Each sampling line 24 includes a main body, an output section and a connecting section; in this embodiment, a sampling line is used as an example for specific description, each sampling line 24 includes a main body 241, an output section 242 and a connecting section 243, and the main body 241 is located in the groove Inside, the output section 242 is bent and extended relative to the main body 241 toward the side of the cell string 30 away from the groove. The fixing part 23 is fixed at the connection between the main body 241 and the output section 242, the output sections 242 of the N-1 sampling lines 24 are welded and connected to the circuit board 21, and the connecting sections 243 of the N-1 sampling lines 24 are connected to a plurality of electrical circuits. The cores 31 are connected correspondingly. Wherein, the corresponding connection may be that two series-connected cells share one sampling line, or except for the cells located at the head end and the end, each other cell corresponds to two sampling lines, which are set according to actual needs.

Referring to FIG. 3, N-1 sampling lines 24 are arranged side by side and not on the same plane. Taking the main bodies of all the sampling lines 24 together in the groove C as an example for illustration, the N-1 sampling lines 24 are arranged in parallel and are not on the same plane,

In this embodiment, a plurality of N-1 sampling lines are arranged in parallel and side by side, wherein the N-1 sampling lines are structured into multiple groups, and the multiple groups of sampling lines are arranged in a stacked manner in the direction away from the groove C, and can be divided into two Layers or more than two layers are stacked, and the number of each layer can be equal or unequal.

The N-1 sampling lines 24 are stacked in three layers, and the number of the three-layer sampling lines is distributed in steps, and in the direction away from the trench C, the number of sampling lines in each group increases.

For example: in this embodiment, the number of cells is 8, the number of sampling lines 24 is 9, the main body of the 9 sampling lines 24 is divided into three layers, and the number of one layer located on the bottom wall of the groove C is at least 2 sampling lines. There are 3 sampling lines in the middle layer and 4 sampling lines in the top layer. The sampling lines 24 in the three layers are distributed in steps and conform to the cross-sectional shape of the groove C to ensure that the sampling wire harness 22 does not protrude from the side of the cell string after being installed. , without increasing the height of the entire battery. The wiring harnesses in other positions are gradually reduced and can be arranged according to the actual situation.

In one embodiment, the cross section of the sampling wire bundle 22 formed by N-1 sampling wires is V-shaped. It can be understood that the nine sampling lines 24 are divided into four layers, and the bottom layer is one.

In one embodiment, the cross section of the sampling wire bundle 22 formed by N-1 sampling wires is circular. It can be understood that the nine sampling lines 24 are distributed in a circle, and can be arranged in two circles or three circles.

In one embodiment, the outer contour shape of the cross section of the sampling wire harness 22 is the same as the cross section contour shape of the groove C. As long as N-1 sampling lines 24 can be reasonably arranged, the outer contour shape of the cross section of the sampling line bundle is the same as the cross section contour shape of the groove C, and the same includes a certain tolerance range and similar shapes. As long as the sampling harness can be stored, the groove C does not affect the overall height of the battery.

In one embodiment, N-1 sampling lines are arranged in parallel on the same plane, as long as they can be completely or partially accommodated by the grooves.

In the embodiment of the present application, a plurality of sampling lines 24 can be arranged side by side on the same plane; a plurality of sampling lines 24 can also be arranged in multiple rows and columns, and the sampling lines 24 in each row and column are arranged in parallel; or A plurality of sampling lines 24 are stacked and arranged; in order to reasonably arrange the sampling lines of the sampling line bundle 22, on the premise of not changing the structure of the battery cell string and the battery, use the groove on the cell string to install the sampling line bundle 22. In the groove, it can be completely or partially contained in height, which avoids or reduces the space occupied by the sampling wire harness in the height direction of the battery, thereby realizing a reasonable layout of the battery and the battery pack 1000 .

As shown in FIG. 7 and FIG. 8 , in this embodiment, the plurality of cells 31 of each cell string 30 are arranged in a row, and the number of cells of the two cell strings 30 is the same and symmetrically arranged. One-to-one side-by-side fit. The groove C is located between the two cell strings 30 and the groove C is located at one end on the same side of the two cell strings 30 , and the same side end of the two cell strings 30 refers to: Among the core strings 30, one of the cell strings 30 used to define the side of the groove C is the upper end side, and the other battery string 30 used to define the side of the groove C is also the upper side side. The side surface of the lower end of 30 defines the groove C, and the side surface of the other cell string 30 that defines the groove C is also the lower end side surface of the battery cell string 30 .

The battery cell string includes a plurality of packaging bags 40 , and the battery cells 31 are correspondingly packaged in the packaging bags 40 to form a battery cell assembly. The cell assembly includes two opposite end surfaces 311 , two opposite side surfaces 312 , and two opposite first surfaces 310 connecting the side surfaces 312 , and the side surfaces 312 and the first surfaces 310 are connected by a transition arc D.

The two first surfaces 310 are the opposite faces of the cell assembly in the thickness direction of the cell string, the two side surfaces 312 are the opposite faces of the cell assembly in the height direction of the cell string, and the two end faces 311 are the opposite faces of the cell assembly in the direction of the height of the cell string. The lengthwise opposite faces of the core string. Insulation plates are sandwiched between the first surfaces 310 of the cell assemblies in the two cell strings 30 that are opposite to each other. As shown in FIG. 3 , the transition arcs D of the cell assemblies in the two cell strings 30 that are opposite to each other and the insulation The sides of the plate 2 together define a groove C. The N-1 sampling lines of the sampling wire harness are installed in the groove C and located in the casing 10, the depth of the groove is smaller than the outer diameter of the sampling wire, and does not need to occupy the internal space, compared with the prior art that the sampling wire harness is placed on the outer surface of the casing It can save the space of the battery in the height direction, and can limit the volume energy density of the battery. It can be understood that the groove wall of the groove C includes the transition arc D and the side of the insulating plate, or the groove wall of the groove C includes the transition arc D, part of the first surface 310 and the side of the insulating plate. Wherein, the side of the insulating board refers to the side surface of the insulating board. In another embodiment, different from the above-mentioned embodiment, the first surfaces 30 of the cell components in the two cell strings 30 that are opposite to each other are directly attached, and the cell components in the two cell strings 30 are opposite to each other The transition arc D defines the groove C. In addition, the groove wall of the groove C may be a transition arc or a transition arc D and 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 can be understood as the outer surface of the packaging bag 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 cell assembly. The sealing portion 41 and the side surface 312 of the cell assembly are enclosed to form an accommodation space. The accommodation space and the groove D is connected. In this way, the accommodating space can also accommodate part of the sampling lines, which is beneficial to improve the space utilization rate. It should be noted that the material of the packaging bag can be selected from aluminum-plastic film or polypropylene, which is not specifically limited in this application. The sealing portion 41 is a structure formed by closing the opening of the packaging bag 40 .

It should be noted that the cell 31 includes a first electrode and a second electrode (not shown), the plurality of cells 31 in the cell string 30 are arranged in a preset direction, and the first electrode and the second electrode are along a preset direction. The directions are distributed on opposite sides of the cell 31 , and the first electrode and the second electrode extend out from the packaging bag 40 . Wherein, the first electrode and the second electrode can be understood as a positive tab and a negative 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 subsequent introduction of the connection method between the sampling line and the cell, the cell 31 will be directly described, and the cell is the cell in the cell assembly.

In this embodiment, as shown in FIGS. 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 the position where the output sections 242 are connected to the main body. Specifically, the output sections 242 of the N-1 sampling lines are first lined up in the mold, and then the molten colloid is injected into the mold for injection molding. In the output section 242, a plurality of sampling lines are simultaneously bent and injected into the same fixed part 23, which simplifies the processing technology and ensures the accuracy. Of course, injection molding can also be performed after the output section 242 is bent relative to the main body 242 . In other embodiments, the fixing portion may also be a cable tie, or the fixing portion may be structural adhesive.

The free end of the output section 242 of each sampling line 24 is a metal joint 242a, the fixing part 23 is a plate-like structure, the output sections 242 of the N-1 sampling lines 24 are fixed in the fixing part, and the N-1 metal joints 242a extend out of the fixing part 23 . It should be noted that, in this embodiment, the position where the output section 242 is connected to the main body 241 is a transition section (not shown), 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 main body 2411 . The arrangement of the fixing portion in this embodiment facilitates the limitation of the spacing of the output sections between the sampling lines, and also facilitates the control of the welding spacing between the metal joint 242a of the sampling line bundle and the circuit board 21 .

Of course, in other embodiments, the fixing part 23 The fixing part 23 includes a fixing body and a bent edge (not shown) provided at one end of the fixing body (not shown), and the output sections 242 of the N-1 sampling lines 24 are fixed Inside the fixing body, and N-1 metal joints 242a protrude out of the fixing portion 23 through the bent edges.

As shown in FIG. 4 , the circuit board 21 includes metal solder joints 210 corresponding to the output sections of the sampling lines 24 one-to-one. The bent edge 232 abuts against the surface of the circuit board 21 with the metal solder joints 210 , and the metal joints 242 a are respectively soldered to the metal joints 210 . The electrical connection between the sampling wire harness 22 and the circuit board 21 is realized on the soldering point 210 , wherein the direct soldering can save the conventionally used connectors for plugging, which can save the cost.

In this embodiment, a safety structure (not shown) is also provided on the surface where the circuit board 21 and the sampling wire harness are welded. In some embodiments, the safety structure is a fuse. Of course, the safety structure can also be a conductive sheet, and the conductive sheet is provided with a weak area; or, the safety structure can also be a protection structure formed by its own circuit structure. When the current of the circuit inside the battery exceeds the threshold, the insurance structure can play the role of overcurrent protection, thereby improving the safety of the battery. Additionally, the fuse may be a serpentine fuse or a chip fuse.

Referring to FIG. 2 and FIG. 5b , the connection sections 243 of the N-1 sampling lines 24 are distributed along the length direction of the cell string 30 , that is, the direction from the head end A to the tail end B can be understood. The sampling wire harness further includes a support member 246 , the connecting section 243 of the sampling wire 24 is bent and disposed relative to the main body 241 , and a support member 246 is provided at the connection between the connecting section 243 and the main body 241 . As shown in FIG. 6 , the connecting section 243 includes a first section 243 a connected with the main body 241 and a second section 243 b connected with the first section 243 a at an angle. In this embodiment, the first section 243a is connected to the second section 243b by bending, and the support member 246 is formed on the first section 243a. The support 246 is a plastic plate, which is formed by injection molding after the connecting section 243 is bent. It can be understood that the connecting section is now bent relative to the main body and then in-mold injection is performed. . The support plate 246 is a sheet-like body, which is wrapped on the first section 243a of the connecting section 243 to keep the connecting section 243 at a certain bending angle. When the sampling wire harness is placed along the length of the cell string 30, the connection The segment 243 can smoothly extend into the gap between the ends of the two adjacent cells 31 to be connected to the tabs. The connection segment 243 is positioned to limit the distance between the connection segment 243 and the main body 241 of the sampling line 24. , which is more convenient for welding with the battery. In another embodiment, as shown in FIG. 5 a , the outer surface of the connecting section 243 of each sampling line 24 is wrapped with glue to support the bending of the connecting section 243 relative to the main body 241 , that is, the sampling line 24 is directly coated with glue on the outer surface of the connecting section 243 After processing, an adhesive layer is formed to wrap around the connecting section 243 .

As shown in FIG. 2 and FIG. 6 , the battery pack 1000 includes a conductive sheet 25 . The conductive sheet 25 connects two cells in series at the tail end B of the two cell strings 30 , and the two cell strings 30 are located at the head end respectively. One of the two cells of 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). The first electrode lead-out member 33 and the second electrode lead-out member are used for The total current drawn from the cell string. The first electrode lead-out member 33 may be the positive electrode tab of the cell at the head end A, and the second electrode lead-out member may be the negative electrode tab of the cell at the head end B. Alternatively, the first electrode lead-out member 33 may be the negative electrode tab of the cell at the head end A, and the second electrode lead-out member may be the positive electrode tab of the cell at the head end B. In other embodiments, the first electrode lead-out member 33 and the second electrode lead-out member may also be lead-out pieces connected to the tabs. The positive and negative electrodes of the cell are distributed on opposite sides of the cell. In this embodiment, the first electrode lead-out member 33 and the second electrode lead-out member are the tabs of the battery cells 31 located at the head ends of the two battery cell strings 30 that are not connected to other battery cells.

The circuit board 21 includes two first soldering pads 212 arranged at intervals; the N-1 sampling lines 24 include a first sampling line 24a, and the connecting section 243 of the first sampling line 24a is connected with the second soldering pad 26, the first electrode The lead-out piece 33 and the second electrode lead-out piece are respectively welded and connected to the two first welding pieces 26 , and the second welding piece 26 is welded and connected to the conductive piece 25 . The cells at the head ends 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, the sampling wire harness 22 is welded to the circuit board through the output section 242 fixed by the fixing part 23, and the sampling wire harness 22. The second welding piece 26 on the first sampling line 24a is welded with the cell conducting piece 25 at the tail end of the cell string 30, which can ensure that the sampling wire harness 22 and the circuit board 21 can be connected to the head end of the cell string 30. Information sampling is performed on the cell at the end and the cell at the tail end. The first sampling line 24a is laser welded between the second welding piece 26 and the conducting piece 25 of the cell string 30, so as to realize electrical connection, and has a reliable structure and low impedance. In this embodiment, the circuit board 21 includes two conductive lines 211 arranged at intervals, and the first soldering piece 212 is connected to the circuit board 21 through the conductive lines 211 . In other embodiments, the first solder pads 212 are directly soldered to the circuit board 21 .

As shown in FIG. 4 , FIG. 5 a , FIG. 5 b and FIG. 6 , every two adjacent cells 31 in the cell string 30 are connected by connecting sheets 34 , and the N−1 sampling lines 24 include N cells 31 and N cells 31 . The connecting pieces 34 correspond to the second sampling lines 24b one-to-one, and the sampling assembly 20 includes a third welding piece 27 corresponding to the second sampling line 24b one-to-one, and the third welding piece 27 is fixedly connected to the connection of the second sampling line 24b On the segment, the third welding piece 27 is used for welding and conducting with the connecting piece 34 .

A connecting piece 34 is provided between two adjacent cells 31 in the same cell string. It can be understood that the gap between the two adjacent cells 31 is correspondingly provided with a connecting piece 34, and the connecting piece 34 is connected between two adjacent cells in the gap. The second sampling line 24b is welded with the connecting piece 34 through the third welding piece 27 and is electrically connected (the second sampling line 24b is electrically connected to the cell) for collecting electrical signals at both ends of the cell .

Referring to FIG. 2 again, the sampling wire harness 22 is N-1 sampling wires arranged in a close line in a row, along the length direction of the cell string 30, the position corresponding to the gap between the two adjacent cells 31 is The position of the connecting piece 34 sets the connecting segment 243 . From the head end to the tail end direction, that is, the length of the second sampling line 24b is gradually elongated along the direction of the cell extension of the cell string, and the first sampling line 24a connected to the conductive sheet 25 is the longest, which can be understood as The cells located at the head end A are in the first row, and they are arranged in sequence. The second sampling line 24b between the first row of cells and the second row of cells is the shortest, and the second sampling line 24b in the middle is based on the connection piece. The lengths of the second sampling lines 24b and the first sampling lines 24a, which are in one-to-one correspondence with the connecting pieces 34 of the N cells 31 in general, vary in steps. In this embodiment, the sampling wire harness 22 performs signal sampling for each battery cell 31 between the head end and the tail end, so as to realize accurate sampling of the battery.

As shown in FIG. 5a, the sampling assembly 20 further includes an information collection element 28, the N-1 sampling lines 24 include a collection line 24c, the information collection element 28 is connected to the connection section of the collection line 24c and is turned on, and the information collection element 28 is connected to a battery cell The cells of the string are pasted between the head and tail ends to collect the physical information of the cells. The information collection element 28 is attached to the tab of the battery cell in the middle of the battery string 30, and the signal collection 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, which is used to acquire the temperature information of the battery cell string.

Referring to FIG. 2 , in this embodiment, N is 8, that is, the number of cells in the cell string 30 is 4, the total number of cells in the two groups of cell strings is 8, and the corresponding sampling lines in the sampling wire harness 22 are 9 The cells of each cell string 30 form three gaps. The first electrode lead-out part 33 and the second electrode lead-out part at one end of the two battery cells 31 respectively located at the head end of the two cell strings are directly connected to the circuit board, and the first electrode of the two battery cells 31 away from the head end is drawn out The element 33 and the second electrode lead-out element are connected to the sampling line 24, and the two electric cells 31 respectively located at the tail end B of the two cell strings are electrically connected through the conductive sheet 25 to realize the series connection of the two cell strings, while the The electrical signals are directly collected through the first sampling line 24a, and are located in three gaps. The two cells including the tail end B are connected to the tabs away from the tail end through the conductive piece, and then sampling is carried out respectively through the second sampling line 24, wherein The acquisition line 24c is located in one of the gaps. The circuit board 21 also has 11 holes, which are matched with the pins of the sampling pins on the first cover plate 12 below and are welded by spot tin to realize the transmission of sampling signals.

The casing 10 is a rectangular hollow casing. In this embodiment, two opposite ends of the casing 10 are provided with openings. The battery pack 1000 includes a first cover plate 12 and a second cover plate 15 . The first cover plate 12 is provided with an opening. Sampling pins, cell strings 30 and sampling assemblies 20 are installed in the casing 10 , the first cover plate 12 and the second cover plate 15 are encapsulated on the opening of the casing 10 , and the sampling pins are electrically connected to the circuit board 21 for connecting The sampling signal is transmitted 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 strings 30 and the sampling assembly 20 therein. In other embodiments, only one end of the casing 10 is provided with an opening, and the first cover plate 12 covers the opening.

As shown in FIG. 9 , the present application further provides a battery pack 1000 , which includes a battery information collector and the above battery 100 , and the battery information collector is electrically connected to the battery. The battery 100 used in the battery pack 1000 in this embodiment is provided with a sampling wire harness and an information collection element inside the casing 10 , and the sampling wire harness 22 is connected to the circuit board 21 . The electrical signal is sampled, and the temperature of the cell in the middle position can be sampled, and the collected information is transmitted to the battery information collector through the circuit board, so as to detect the working state of each cell of the battery inside the battery pack 1000, which is conducive to improving the battery The safety of using the battery pack 100 can be improved, thereby improving the safety of the battery pack 1000 .

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

Claims

A battery, characterized in that the battery comprises:

a casing, a sampling assembly mounted inside the casing, and at least two battery cell strings that are electrically connected; the battery core string includes a plurality of battery cells that are connected in series, two of the battery core strings are arranged side by side, and two of the battery core strings are A groove is formed between the cell strings, and the groove is located at one end of the two cell strings on the same side,

The sampling assembly includes a sampling wire harness, the sampling wire harness includes a plurality of sampling lines, the sampling lines are accommodated in the grooves, and the sampling lines are electrically connected to the battery cells in a one-to-one correspondence.
The battery according to claim 1, wherein a plurality of the sampling lines are arranged side by side.
The battery according to any one of claims 1-2, wherein a plurality of the sampling lines are arranged in parallel and side by side.
The battery according to claim 1, wherein a plurality of the sampling lines are configured in a plurality of groups, and the plurality of groups of the sampling lines are arranged in a stacked manner in a direction away from the bottom wall of the groove.
The battery according to claim 4, wherein in a direction away from the bottom wall of the groove, the number of sampling lines in each group of the sampling lines gradually increases.
The battery according to any one of claims 1-5, wherein 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 cell assembly includes a side surface and two opposite first surfaces connecting the side surfaces, and the side surface and the first surface are connected by a transition arc;

The first surfaces of the cell assemblies in the two cell strings that are opposite to each other are attached, and the transition arcs of the cell assemblies in the two cell strings that are opposite to each other define the groove; Or, an insulating plate is sandwiched between the first surfaces of the cell assemblies in the two cell strings that are opposite to each other, and the transition arcs of the cell assemblies in the two cell strings are opposite to each other. The groove is defined together with the side of the insulating plate.
The battery according to claim 6, wherein the packaging bag comprises a sealing part, the sealing part is located on the side of the cell assembly, and the sealing part and the side of the cell assembly surround A accommodating space is formed in combination, and the accommodating space communicates with the groove.
The battery according to any one of claims 1-5, wherein the two battery cell strings are connected in series, the two battery cell strings respectively include a head end and a tail end, and the two battery cell strings are The total number of cells is N, and the sampling lines of the sampling harness are N-1, where N is an integer,

The sampling assembly includes a circuit board located at the head end of the battery string, each sampling line includes a main body, an output section and a connecting section, the output section and the connecting section are arranged at opposite ends of the main body, and the main body is located at the opposite end of the main body. In the groove, the output section is bent and extended relative to the main body toward the side of the battery string away from the groove,

The battery includes a conductive sheet, the conductive sheet connects the two battery cells located at the rear end of the two battery cell strings, and the two battery cell strings are respectively located in the two battery cells at the head end. One cell is provided with a first electrode lead-out piece, and the other 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 to draw out the total current of the cell string,

The circuit board includes two first soldering pads arranged at intervals, the N-1 sampling lines include a first sampling line, and the connecting end of the first sampling line is connected with a second soldering pad, and the first sampling line is connected to the first sampling line. The electrode lead-out piece and the second electrode lead-out piece are respectively welded and connected with the two first welding pieces, and the second welding piece is welded with the conductive piece and connected with each other.
The battery according to claim 8, wherein the connecting section of the sampling line is bent relative to the main body, and a support is provided at the connection between the connecting section and the main body; or, the sampling line is connected The outer surface of the segment is coated with gel to support the bending of the connecting segment relative to the main body.
The battery according to claim 8, wherein two adjacent cells in the cell string are connected by a connecting piece, and the N-1 sampling lines include a first one corresponding to the connecting piece one-to-one. Two sampling lines, the sampling assembly includes a third welding piece corresponding to the second sampling line one-to-one, the third welding piece is connected to the connecting section of the second sampling line, and the third welding piece is connected to the second sampling line. The connecting piece is soldered and conducted.
A battery pack, characterized by comprising a battery information collector and the battery according to any one of claims 1-10, wherein the battery information collector is electrically connected to the battery.