CN219269158U

CN219269158U - Circuit board assembly and battery pack

Info

Publication number: CN219269158U
Application number: CN202223198216.2U
Authority: CN
Inventors: 支本丰
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-06-27
Anticipated expiration: 2032-11-30

Abstract

The utility model discloses a circuit board assembly and a battery pack, wherein the circuit board assembly comprises an acquisition wire harness plate and an insulation positioning piece, the insulation positioning piece is fixedly connected with the acquisition wire harness plate, the insulation positioning piece comprises a positioning structure, and the positioning structure is used for positioning and mounting a battery cell of the battery pack so as to position the installation position of the acquisition wire harness plate in the battery pack, realize the positioning efficiency of the acquisition wire harness plate and the battery cell, and further improve the assembly efficiency of the battery; in addition, the circuit board assembly can further comprise the conductive bars electrically connected with the acquisition wire harness board, and the number of the conductive bars can be flexibly configured according to the number of the electric cores in the product, so that the cost of the battery is saved.

Description

Circuit board assembly and battery pack

Technical Field

The utility model relates to the technical field of electric energy, in particular to a circuit board assembly and a battery pack.

Background

With the continuous development of science and technology, the power battery is more and more widely applied, and particularly, the application in the field of electric vehicles is more and more remarkable.

Currently, a power battery includes a plurality of battery cells, each of which is assembled into a battery pack, and a plurality of battery packs are installed in a case in a serial-parallel manner to be assembled into a battery pack. The power battery is further provided with a flat cable, the flat cable not only can realize connection between each electric core or battery pack in the power battery, but also can realize transmission of all parts in the power battery and external data, and the flat cable is generally longer in length and softer, so that the flat cable is not easy to stably and quickly install in the power battery.

Disclosure of Invention

The utility model aims to provide a circuit board assembly capable of being rapidly positioned in a battery and the battery with the circuit board assembly.

The utility model provides a circuit board assembly, which comprises the following components:

collecting a wire harness plate;

the insulation locating piece is fixedly connected with the collection wiring harness plate and comprises a locating structure, and the locating structure is used for locating and installing the battery cells of the battery pack so as to locate the installation position of the collection wiring harness plate in the battery pack.

In addition, the utility model also provides a battery pack which comprises a plurality of electric cores and the circuit board assembly.

The insulation positioning piece is arranged in the circuit board assembly, the insulation positioning piece is fixedly connected with the acquisition wire harness plate, the positioning structure arranged on the insulation positioning piece can rapidly position the acquisition wire harness plate at the installation position, the positioning efficiency of the acquisition wire harness plate and the battery core is improved, and the assembly efficiency of the battery pack is improved.

Since the above circuit board assembly has the above technical effects, the battery pack having the circuit board assembly also has similar technical effects, and thus will not be described herein.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of a connection state of two battery packs according to the present utility model;

FIG. 2 is an exploded view of the first battery pack of FIG. 1;

FIG. 3 is a schematic view of the circuit board assembly of FIG. 1, excluding the conductive bars;

FIG. 4 is a schematic view of the insulating positioning member shown in FIG. 1;

fig. 5 is a front view of the insulating spacer of fig. 4.

The reference numerals in fig. 1-5 are illustrated as follows:

100 first battery pack; 100' a second battery pack; 1, an electric core; 11 a first pole; 12 second pole; 2, a circuit board assembly; 21, collecting a circuit board; 22 conductive bars; 221 a first conductive line; 222 a second conductive row; 23 insulating positioning pieces; 231 first through holes; 232 a second via; 233 boss; 234 a boss; 235 mounting slots; 236 explosion-proof through holes; 237 connecting ribs; a 24 temperature sensor; 25 connecting sheets; 3 fixing pieces.

Detailed Description

The flat cable typically includes a plurality of data cables for transmission of different signals, and accordingly, needs to be connected to different components in the battery. The current flat cable installation is basically as follows: the rough position of the flat cable is estimated initially, and then is adjusted according to the connecting parts, so that the installation efficiency is low.

In order to better understand the technical solution of the present utility model, the following description is provided with reference to the accompanying drawings and specific embodiments.

The term "plurality" as used herein refers to a plurality, typically two or more, of indefinite quantities; and when "a number" is used to denote the number of a certain number of components, the number of components is not necessarily related to each other.

The terms "first," "second," and the like, herein are merely used for convenience in describing two or more structures or components that are identical or functionally similar, and do not denote any particular limitation of order and/or importance.

Referring to fig. 1 to 5, fig. 1 is a schematic structural diagram of an embodiment of a connection state of two battery packs according to the present utility model; FIG. 2 is an exploded view of the first battery pack of FIG. 1; FIG. 3 is a schematic view of the circuit board assembly of FIG. 1, excluding the conductive bars; FIG. 4 is a schematic view of the insulating positioning member shown in FIG. 1; fig. 5 is a front view of the insulating spacer of fig. 4.

The battery pack comprises battery packs and a box body (not shown in the figure), wherein the number of the battery packs is at least one, and usually a plurality of battery packs (namely two or more than two battery packs), and each battery pack is assembled into a whole in a serial-parallel connection mode. Two battery packs, defined as a first battery pack 100 and a second battery pack 100', respectively, are shown in fig. 1, the first battery pack 100 and the second battery pack 100' being connected in series. The number of battery packs in the battery and the structure of each battery pack are not limited to those described herein, and may be determined according to specific products. The box body is provided with an inner cavity, and each battery pack is fixedly arranged in the box body. The parameters of the shape, the material and the like of the box body are not specifically described herein, and reference is made to the prior art.

As will be understood with reference to fig. 1 and 2, the battery pack of the present utility model mainly includes a battery cell 1, a circuit board assembly 2 and a fixing member 3.

The number of the battery cells 1 is a plurality, and the plurality is usually more than two, and each battery cell 1 is arranged side by side. The fixing members 3 are located at the ends of the assembly formed by the respective cells 1 in the arrangement direction, and the number of the fixing members 3 may be two, and the fixing members 3 are respectively disposed at the two ends of the assembly formed by the respective cells 1 in the arrangement direction, as shown in fig. 1 and 2, the respective cells 1 are arranged in the direction S, and the two fixing members are located at the two ends of all the cells 1 in the battery pack in the direction S. The fixing element 3 may be an end plate, but of course the fixing element 3 may also be other structures, such as a beam structure.

Each cell 1 is provided with two polar posts, namely a first polar post 11 and a second polar post 12, one of the first polar post 11 and the second polar post 12 is a positive polar post, the other is a negative polar post, the first polar post 11 and the second polar post 12 are both positioned at the top of the cell 1, and the two polar posts are respectively close to two end parts of the cell 1. The circuit board assembly 2 of the present utility model includes an acquisition harness board 21, a plurality of conductor bars 22 and insulating spacers 23. The collecting harness board 21 may be a flexible printed circuit obtained by chemical etching, and of course, the collecting harness board 21 may also be a structure in which a flat copper foil is sandwiched between upper and lower insulating foil films, and of course, the collecting harness board 21 may also be other structures, so long as the function of data transmission can be achieved. The acquisition harness board 21 is typically of a flat construction in order to reduce space occupation.

The insulation positioning piece 23 is fixedly connected with the acquisition wire harness plate 21, the insulation positioning piece 23 comprises a positioning structure, and the positioning structure is used for positioning and mounting with the battery cells 1 of the battery pack so as to position the acquisition wire harness plate 21 in the battery pack, that is, the acquisition wire harness plate 21 can be positioned and mounted with at least one battery cell 1 through the insulation positioning piece 23. The wiring board assembly 2 may be mounted with two or three or more insulating positioning members 23 for positioning and mounting the acquisition harness board 21. The location and number of the insulating spacers 23 may be appropriately selected according to the shape and length of the collection harness plate 21, and are not specifically limited herein and do not hinder the understanding and implementation of the technical solutions herein by those skilled in the art.

The insulating positioning member 23 may be made of plastic with better strength and high temperature resistance, or other insulating materials, such as ceramic.

In the utility model, the insulating positioning piece 23 is supported on the top of at least one cell 1, the insulating positioning piece 23 is provided with a through hole, and the through hole is matched with a pole for positioning, so that the position of the acquisition harness plate 21 along the length direction and the width direction of the acquisition harness plate is limited, namely, the through hole is of the positioning structure. The through hole and the pole are matched and positioned in a simple structure.

The number of through holes in one insulating positioning member 23 may be one, or may be two, or three or more, and two different embodiments are given below.

In one embodiment, the number of through holes is one, at least two posts are located inside the through holes, and each post is capable of being positioned in cooperation with a corresponding inner wall of the through hole. The poles matched with the through holes can be the first pole and the second pole of the same electric core, and of course, the poles on the two electric cores can also be the poles, and the through holes are not limited herein.

In this embodiment, only one through hole is machined on the insulating positioning member 23 to realize the matching positioning with the pole of the battery cell 1, so that the structure is simple, and the overall weight of the battery pack is reduced.

For safety, the explosion-proof valve is usually installed on the battery core 1, in the utility model, the through hole is matched and positioned with two poles of the same battery core, the through hole is also provided with at least one connecting rib, and each connecting rib 237 is positioned above the explosion-proof valve of the battery pack.

The ribs 237 in this example serve to strengthen the cells on the one hand and to prevent some large particulate matter (e.g., separator) from being ejected and causing thermal runaway in adjacent cells on the other hand.

As will be understood in conjunction with fig. 2, 4 and 5, in another example, the through holes include a first through hole 231 and a second through hole 232, which are respectively used for passing through two poles of a battery cell located below the insulating positioning member 23, and the first through hole 231 and the second through hole 232 can be cooperatively positioned with the two poles of the same battery cell.

In this embodiment, the insulating positioning member 23 may be matched with the width and length of the electric core 1, and is horizontally placed on the top of the electric core to form a top insulating cover plate of the electric core, and the through holes (the first through hole 231 and the second through hole 232) of the insulating positioning member 23 for avoiding the polar posts form a positioning structure for positioning the acquisition harness plate 21 at the same time, so that the structure of the insulating positioning member 23 is simplified. The insulating spacer 23 of this structure is relatively high in use strength.

In addition, in this embodiment, the insulating positioning member 23 is further provided with an explosion-proof through hole 236, the explosion-proof through hole 236 is located above the explosion-proof valve of the battery pack, and at least one connecting rib 237 is provided inside the explosion-proof through hole. The function of the connecting rib 237 in this example is the same as described above, and will not be described here.

The circuit board assembly 2 of the present utility model further includes at least one temperature sensor 24 for detecting the temperature of at least one battery cell in the battery pack, and the working temperature of the battery pack or the battery where the battery cell is located can be known through the collection of the temperature of the battery cell by the temperature sensor 24. Specifically, the temperature sensor 24 includes a temperature acquisition end and a signal transmission end, the signal transmission end is electrically connected and fixed with the acquisition harness plate 21, the temperature acquisition end is capable of acquiring the temperature of at least one electric core 1, the temperature sensor is fixedly mounted on the insulation positioning member 23, and the insulation positioning member 23 is fixedly connected with the acquisition harness plate 21 through the temperature sensor 24.

In this example, the temperature sensor 24 can not only realize the temperature detection of the battery cell, but also play a role in fixedly connecting the insulating positioning member 23 and the acquisition harness plate 21, and simplify the structure of the circuit board assembly.

The present utility model finds that the battery generates a relatively large amount of heat when the battery is rapidly charged, and the post temperature does not coincide with the battery temperature, so the temperature sensor 24 is further provided herein as follows.

In the present utility model, the temperature collecting end of the temperature sensor 24 may be abutted against or disposed opposite to the upper cover plate of the battery cell to collect the temperature of the upper cover plate of the corresponding battery cell. The temperature sensor 24 of the present utility model measures the temperature of the upper cover plate of the cell with a higher accuracy than the temperature of the terminal of the cell.

The number of the temperature sensors 24 is at least two, each temperature sensor 24 is arranged at intervals along the length direction of the collection harness plate 21, the length direction of the collection harness plate 21 is the S direction in fig. 1, and the width direction of the corresponding collection harness plate 21 is the direction perpendicular to the S direction in the horizontal plane. In one example, the temperature sensor 24 is mounted on the insulating positioning member 23, i.e. the insulating positioning member 23 is provided with mounting structures for said temperature sensor 24. An insulating positioning member 23 may be provided with a temperature sensor 24.

The insulating positioning member 23 is formed with a protruding boss 233 on a side facing away from the battery pack, the boss 234 is provided with a mounting groove 235, the temperature sensor 24 is at least partially fixed inside the mounting groove 235, and the signal transmission end extends out of the mounting groove 235 to connect the collection harness plate 21, and the mounting structure is the mounting groove 235.

The mounting groove 235 is used for fixing the temperature sensor 24 reliably.

The inside of the mounting groove 235 is also filled with a glue structure, and the temperature sensor 24 is further fixedly connected with the mounting groove 235 through the glue structure, so that the fixing reliability of the temperature sensor 24 can be improved, and the means is simple.

The initial state of the glue structure can be liquid glue or solid structural glue, such as heat-conducting structural glue, and the glue structure can be other glue. Is mounted in the mounting groove 235 by dispensing, filling, smearing, bonding, or the like.

The circuit board assembly of the present utility model further includes a conductive strip 22 for electrically connecting adjacent poles. The conductive bar 22 is electrically connected with the acquisition harness board 21; referring to fig. 3, the conductive bars are connected to the collection harness plate 21 through a connector 25, and the two can be fixed by a hot press film or an injection molding. The conductive bars on the acquisition harness plate 21 can be relatively independent, the number of the conductive bars can be flexibly configured according to the number of the electric cores in the product, and therefore the battery cost is saved, and the insulation positioning piece 23 is arranged in the circuit board assembly 2, so that the acquisition harness plate 21 can be rapidly positioned on the electric cores through the insulation positioning piece 23, the positioning efficiency of the acquisition harness plate 21 and the electric cores is realized, and the assembly efficiency of the battery can be further improved.

An insulating positioning piece 23 is arranged between at least one conductive bar 22 and the battery cell 1, and the insulating positioning piece 23 is clamped between the conductive bar 22 and the battery cell 1. The collecting harness plate 21 is electrically connected with a plurality of pairs of conductive bars 22 along both sides of the length direction thereof, and two conductive bars connecting two poles of the same cell 1 are referred to herein as a pair of conductive bars. Each pair of conductive bars comprises a first conductive bar 221 and a second conductive bar 222, which are respectively positioned at two sides of the acquisition harness board and are respectively and electrically connected with the two poles of the same electric core. The conductive bars on two sides of the collection wiring harness plate 21 are respectively and electrically connected with the first pole and the second pole of each electric core. The main function of the conductive bars is to realize serial-parallel connection between the battery cells, and the material of the conductive bars 22 can be copper, aluminum or copper-aluminum composite material.

In this example, the insulating positioning member 23 is pressed on the battery cell 1 through the conductive bar 22, and other fixing members are not needed, so that the structure is relatively simple.

The insulating positioning member may be a plate structure, and is located below a pair of conductive bars on two sides of the same electric core, that is, an insulating positioning member 23 is disposed between at least a pair of conductive bars and the electric core. In this example, the insulating positioning member 23 is installed between the conductive bars and the electric core, so that the insulating positioning member 23 can play a role in supporting the conductive bars to a certain extent, can play a role in reinforcing the electric core structure, reduces occupation of other spaces of the battery, and has a relatively compact structure.

The side of the insulating positioning piece 23 facing the conducting bar is also provided with a supporting structure, and when the conducting bar 22 and the pole are in a welding fixed state, the conducting bar is at least partially supported on the supporting structure. The figure shows a specific example in which the insulating spacers 23 are locally provided with a supporting structure, and the first and second conductive rows are only locally supported by the supporting structure located thereunder, so that the weight of the insulating spacers can be reduced.

The support structure may take a variety of forms, such as the boss 233 shown in the figures, which may be a bar-like structure, a dot-like structure, or other structures.

The upper surface of the boss 233 is lower than the upper surface of the pole to avoid affecting the connection between the pole and the conductor bar 22.

Of course, the opposite surfaces of the conductive bars and the insulating positioning pieces 23 can be in surface-to-surface contact, the contact area of the conductive bars and the insulating positioning pieces is relatively large, and the supporting capability is relatively good.

Since the foregoing circuit board assembly 2 has the technical effects as described above, the battery having the circuit board assembly 2 also has similar technical effects, and thus will not be described herein.

The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.

Claims

1. A circuit board assembly comprising the following components:

collecting a wire harness plate;

2. The circuit board assembly of claim 1, wherein the insulating spacer is supported on top of at least one of the cells, the insulating spacer having a through hole that mates with a post; the positioning structure is the through hole.

3. The circuit board assembly of claim 2, wherein the number of through holes is one, and the posts of at least two of the cells are located inside the through holes and are cooperatively positioned with the corresponding inner walls of the through holes.

4. A circuit board assembly according to claim 3, wherein the through hole is positioned in cooperation with two poles of the same cell, the through hole is further provided with at least one connecting rib, and each connecting rib is positioned above an explosion-proof valve of the cell in the battery pack.

5. The circuit board assembly of claim 2, wherein the through holes comprise a first through hole and a second through hole for respectively passing through two poles of the battery cell located below the insulating positioning member, and the first through hole and the second through hole are respectively capable of being cooperatively positioned with the two poles.

6. The circuit board assembly according to claim 5, wherein the insulating positioning member is further provided with an explosion-proof through hole located above the explosion-proof valve of the battery pack, and at least one connection rib is provided inside the explosion-proof through hole.

7. The circuit board assembly of claim 1, further comprising at least one temperature sensor, wherein the temperature sensor comprises a temperature acquisition end and a signal transmission end, wherein the temperature acquisition end is capable of acquiring the temperature of the battery cell, the signal transmission end is connected and fixed with the acquisition harness plate, the temperature sensor is fixedly mounted on the insulation positioning member, and the insulation positioning member is fixedly connected with the acquisition harness plate through the temperature sensor.

8. The circuit board assembly according to claim 7, wherein the insulating positioning member is formed with a protruding portion on a side facing away from the battery pack, the protruding portion is provided with a mounting groove, the temperature sensor is at least partially fixed inside the mounting groove, and the signal transmission end protrudes from the mounting groove to connect the collection harness board.

9. The circuit board assembly of claim 8, wherein the interior of the mounting slot further has a glue structure, and the temperature sensor is further fixedly connected to the mounting slot by the glue structure.

10. The circuit board assembly according to claim 7, wherein the temperature collection end of the temperature sensor is abutted against or opposite to the upper cover plate of the battery cell to collect the temperature of the upper cover plate of the corresponding battery cell.

11. The circuit board assembly of claim 7, wherein the number of temperature sensors is at least two, each of the temperature sensors being spaced apart along the length of the collection harness plate.

12. The circuit board assembly of any one of claims 2 to 7, further comprising an electrical conductor bar for electrical connection to adjacent poles and the electrical conductor bar is electrically connected to the collection harness board; and the insulating locating piece is arranged between at least one conducting bar and the electric core, and is clamped between the conducting bar and the electric core.

13. The circuit board assembly of claim 12, wherein the insulating spacer is a plate-like structure positioned below a pair of conductive bars of the same cell.

14. The circuit board assembly of claim 13, wherein the sides of the insulating spacer facing the conductor bars each have a boss opposite the conductor bars, the conductor bars being supported by the bosses therebelow.

15. The circuit board assembly of claim 14, wherein an upper surface of the boss is lower than an upper surface of the post.

16. A battery pack comprising a plurality of cells and the circuit board assembly of any one of claims 1 to 15.