CN220710583U

CN220710583U - Battery cell sampling system, battery pack and vehicle

Info

Publication number: CN220710583U
Application number: CN202322001643.5U
Authority: CN
Inventors: 李乔博
Original assignee: Beijing Chehejia Automobile Technology Co Ltd
Current assignee: Beijing Chehejia Automobile Technology Co Ltd
Priority date: 2023-07-27
Filing date: 2023-07-27
Publication date: 2024-04-02
Anticipated expiration: 2033-07-27

Abstract

The utility model discloses a battery cell sampling system, a battery pack and a vehicle, wherein the battery cell sampling system comprises a frame, a plurality of aluminum rows and a circuit board, the aluminum rows are connected with the frame, the circuit board comprises a connecting insulating body and a conductor substrate arranged on the insulating body, the insulating body is connected with the frame, the conductor substrate comprises a plurality of sampling branches protruding out of the outer surface of the insulating body, the sampling branches correspond to the aluminum rows one by one, and the sampling branches are abutted against one side of the corresponding aluminum row and are connected with the corresponding aluminum row. The battery cell sampling system provided by the utility model has the advantages of simple process and low cost.

Description

Battery cell sampling system, battery pack and vehicle

Technical Field

The utility model relates to the technical field of battery packs, in particular to a battery cell sampling system, a battery pack and a vehicle.

Background

Under the pressure of energy crisis and environmental pollution problems, new energy automobiles are strongly supported by traffic and energy departments due to the energy conservation and environmental protection advantages. The battery cell is used as a key of a new energy automobile, plays a very important role, and has variability due to the manufacturing process, working conditions, battery aging and the like, so that the battery cell needs to be monitored and balanced when the battery cell forms a module, and the service life of the power battery is prolonged to the maximum extent. The voltage signal and the temperature signal of the battery cell are transmitted to the BMS (Battery Management System ) for monitoring through the battery cell sampling system, so that the battery cell sampling system directly influences the acquisition of the battery signal and the service life of the battery, and the battery cell sampling system has very important significance on the whole electrical system.

In the related art, a flexible circuit board is usually adopted as a main body in the battery cell sampling system, and the flexible circuit board is connected with an aluminum row in the battery cell sampling system through a nickel plate to complete electric connection sampling, and is connected with an NTC (Negative Temperature Coefficient, a thermistor) to complete sampling of the temperature of the battery cell. However, the connection between the flexible circuit board and the aluminum row in the cell sampling system has the defects of complex connection process and high cost.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems in the related art to some extent.

Therefore, the embodiment of the utility model provides a battery cell sampling system, which has the advantages of simple process and low cost.

The embodiment of the utility model also provides a battery pack.

The embodiment of the utility model also provides a vehicle.

The battery cell sampling system comprises a frame, a plurality of aluminum rows and a circuit board, wherein the plurality of aluminum rows are connected with the frame; the circuit board comprises an insulating body and a conductor substrate arranged on the insulating body, the insulating body is connected with the frame, the conductor substrate comprises a plurality of sampling branches protruding out of the outer surface of the insulating body, the sampling branches correspond to the aluminum rows one by one, and the sampling branches are propped against one side of the corresponding aluminum row and are connected with the corresponding aluminum row.

According to the battery cell sampling system provided by the embodiment of the utility model, the conductive substrate in the circuit board is directly molded into the sampling branch protruding out of the outer surface of the insulating body, and the sampling branch is in contact connection with the corresponding aluminum row, so that the electrical connection sampling is realized. The electric core sampling system is characterized in that the electric core sampling system comprises an electric core sampling system, a conductive substrate, an aluminum row, a nickel sheet and other adapter pieces, wherein the nickel sheet and other adapter pieces are not needed to be arranged between the conductive substrate and the aluminum row, so that the use cost of the adapter pieces is saved, and the connection procedure of the adapter pieces and the conductive substrate is omitted.

In some embodiments, the sampling branch includes an extension section and a welding section connected to a portion of the conductor substrate located in the insulating body, the extension section and the welding section are both sheet-shaped structures, a maximum width of the extension section is lower than a minimum width of the welding section, and the welding section is connected to the aluminum row by ultrasonic welding.

In some embodiments, the conductor substrate comprises a copper foil substrate, the sampling branches are made of rolled copper and protrude from edges of the insulating body, and the sampling branches are in abutting contact with sides of the corresponding aluminum bars facing away from the frame.

In some embodiments, the insulating body is in a strip shape, and the plurality of sampling branches are respectively arranged at two sides of the width direction of the insulating body.

In some embodiments, the circuit board further includes an NTC, the conductor substrate further includes a connection portion protruding from an outer surface of the insulating body, and the NTC is detachably connected to the connection portion.

In some embodiments, the cell sampling system further comprises a solder paste connecting the NTC and the connection portion in a thermal fusion welding manner.

In some embodiments, the circuit board further comprises a connector connected to the insulating body and electrically connected to the conductor substrate by a pierce crimp.

In some embodiments, the insulating body is a flexible plate structure, the insulating body is adhered to the frame, and one side surface of the insulating body is attached to the surface of the frame.

In some embodiments, the frame is provided with a hot riveting column, the aluminum row is provided with a positioning hole, the aluminum row is sleeved on the hot riveting column through the positioning hole, and the part of the hot riveting column passing through the positioning hole is deformed through a hot riveting process and is abutted to the side surface of the aluminum row, which is away from the frame.

A battery pack according to an embodiment of the present utility model includes a cell sampling system as described in any of the embodiments above.

Technical advantages of the battery pack according to the embodiment of the present utility model are the same as those of the battery cell sampling system of the above embodiment, and will not be described here again.

A vehicle according to an embodiment of the present utility model includes the battery pack of the above embodiment.

Technical advantages of the vehicle according to the embodiment of the present utility model are the same as those of the battery pack of the above embodiment, and will not be described here again.

Drawings

Fig. 1 is a schematic diagram of a cell sampling system according to an embodiment of the present utility model.

Fig. 2 is an exploded view of a cell sampling system according to an embodiment of the present utility model.

Fig. 3 is an enlarged partial schematic view of a cell sampling system according to an embodiment of the present utility model.

Fig. 4 is a schematic diagram of a portion of a circuit board in a cell sampling system according to an embodiment of the present utility model.

Reference numerals:

100. the battery cell sampling system; 1. a frame; 11. hot riveting columns; 2. an aluminum row; 3. a circuit board; 31. an insulating body; 32. sampling branches; 321. an extension section; 322. a welding section; 33. a connection part; 34. an NTC; 35. a connector.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

A cell sampling system 100 according to an embodiment of the present utility model is described below in conjunction with fig. 1-4.

The cell sampling system 100 according to an embodiment of the present utility model includes a frame 1, an aluminum bar 2, and a circuit board 3. The aluminum bars 2 are a plurality of, and a plurality of aluminum bars 2 are connected with the frame 1. The circuit board 3 includes a connection insulating body 31 and a conductor substrate provided on the insulating body 31. The insulating body 31 is connected with the frame 1, the conductor substrate comprises a plurality of sampling branches 32 protruding out of the outer surface of the insulating body 31, the sampling branches 32 are in one-to-one correspondence with the aluminum rows 2, and the sampling branches 32 are abutted against one side of the corresponding aluminum row 2 and are connected with the corresponding aluminum row 2.

According to the cell sampling system 100 of the embodiment of the present utility model, the conductive substrate in the circuit board 3 forms the sampling branch 32 protruding from the outer surface of the insulating body 31, and the sampling branch 32 is directly contacted and connected with the corresponding aluminum row 2, thereby realizing electrical connection sampling. The conductive substrate and the aluminum row 2 do not need to be provided with any adapter such as nickel sheets, so that the use cost of the adapter is saved, the connection procedure of the adapter and the conductive substrate is omitted, and the assembly process of the battery cell sampling system 100 is simpler and the cost is lower.

The circuit board 3 is a flexible circuit board 3, the insulating body 31 is mainly a cover film, and the cover film covers at least a part of the conductor substrate, and the circuit board 3 is connected with the frame 1 through the insulating body 31 to ensure the insulation between the conductor substrate and the frame 1.

In some embodiments, as shown in fig. 3, the sampling branch 32 includes an extension section 321 and a welding section 322, where the extension section 321 is connected to a portion of the conductor substrate located in the insulating body 1, and the extension section 321 and the welding section 322 are both in a sheet structure, and the maximum width of the extension section 321 is lower than the minimum width of the welding section 322, and the welding section 322 is connected to the aluminum row 2 by ultrasonic welding.

That is, when the sampling branch 32 is abutted against one side surface of the corresponding aluminum row 2, a high-frequency vibration wave is transmitted to the surfaces of the welding section 322 and the aluminum row 2 abutted against each other, and the surfaces of the welding section 322 and the aluminum row 2 abutted against each other are rubbed against each other under pressure to form fusion between the molecular layers. Compared with the mode of connecting the welding section 322 with the aluminum busbar 2 by adopting an SMT (Surface Mount Technology, surface mounting technology) process or laser welding and the like in the related art, the ultrasonic pen welding is adopted in the embodiment to effectively improve the reliability of the electric connection between the welding section 322 and the aluminum busbar 2, the failure probability of the electric connection between the welding section 322 and the aluminum busbar 2 is low, and the failure rate of the battery cell sampling system 100 is low.

In addition, the design of the welding section 322 is widened relative to the extension section 321, so that the surface area of the welding section 322 is effectively increased, the welding area of the welding section 322 and the aluminum busbar 2 is increased, the connection reliability of the welding section 322 and the aluminum busbar 2 is further increased, and the failure rate of the battery cell sampling system 100 is further reduced.

Specifically, the width of each position of the welding section 322 is uniform, the width of each position of the extension section 321 is uniform, and the width of the welding section 322 is greater than the width of the extension section 321.

In some embodiments, the conductor substrate comprises a copper foil substrate, the sampling branches 32 are made of rolled copper and protrude from the edge of the insulating body 31, and the sampling branches 32 are in abutting contact with the side of the corresponding aluminum row 2 facing away from the frame 1.

I.e. the circuit board 3 uses the most common copper foil as the conductor substrate and the required lines are made by etching, the sampling branches 32 being made of calendered copper. This arrangement effectively reduces the manufacturing cost of the circuit board 3 and also further improves the reliability of the electrical connection of the sampling branch 32 and the aluminum busbar 2.

In some embodiments, the insulating body 31 is elongated, and the plurality of sampling branches 32 are respectively disposed on two sides of the insulating body 31 in the width direction.

As shown in fig. 3 and fig. 4, the arrangement mode of the sampling branches 32 in the circuit board 3 is matched with the arrangement mode of the plurality of aluminum rows 2 on the frame 1, and the plurality of sampling branches 32 are arranged on two sides of the width direction of the insulating body 31, so that the insulating body 31 and the aluminum rows 2 are arranged in the horizontal direction, and meanwhile, the sampling branches 32 are convenient to press against one side of the corresponding aluminum row 2 in the thickness direction, and at the moment, the sampling branches 32 and the aluminum rows 2 are not easy to be interfered by the insulating body 31 when being connected, thereby further improving the manufacturing efficiency of the battery cell sampling system 100.

Specifically, as shown in fig. 1-4, the sampling branches 32 are sheet-like structures, and the thickness of the sampling branches 32 may be 0.3 μm to 0.4 μm, such as may be 0.35 μm, to ensure that the sampling branches 32 have sufficient strength. After the insulating body 31 and the aluminum row 2 are connected with the frame 1, the sampling branch 32 is lapped on the top surface of the corresponding aluminum row 2, and at the moment, when ultrasonic welding is adopted, the pressurizing operation of the sampling branch 32 is simple and convenient.

In some embodiments, the circuit board 3 further includes an NTC34, the conductor substrate further includes a connection portion 33 protruding from an outer surface of the insulating body 31, and the NTC34 is detachably connected to the connection portion 33. The NTC34 is electrically connected with the connecting part 33 so that the battery cell sampling system 100 can realize the sampling of the battery cell temperature, the NTC34 is detachably connected with the connecting part 33, when the NTC34 is damaged and fails, the battery cell temperature sampling function of the battery cell sampling system 100 can be realized again only by replacing the NTC34, the whole circuit board 3 is not required to be scrapped, and the maintenance cost of the battery cell sampling system 100 is effectively reduced.

In some embodiments, the cell sampling system further comprises a solder paste, which connects the NTC34 and the connection part 33 in a thermal welding manner. Wherein the solder paste may be printed on the connection part 33 first, and then melted by heat and connected to the NTC34 and the connection part 33. This arrangement ensures the reliability of the electrical connection between the NTC34 and the connection portion 33, and at the same time, the NTC34 can be removed by melting solder paste, so that the NTC34 is easy to assemble and disassemble.

Alternatively, the NTC34 may be detachably coupled to the coupling part 33 by means of a screw or the like.

In some embodiments, the circuit board 3 further includes a connector 35, the connector 35 being connected to the insulating body 31 and electrically connected to the conductor substrate by piercing crimping. That is, the connector 35 is a puncture type connector 35, the connector 35 is connected with the insulating body 31 by way of pressure connection, so that the reliability of the electrical connection between the connector 35 and the conductor substrate is higher, the failure rate of the electrical connection between the connector 35 and the conductor substrate is lower, and meanwhile, compared with the prior art that the connector 35 adopts an SMT welding way, the connecting way of the embodiment has the advantages of simple connecting process and high connecting efficiency.

The insulating body 31 is of a flexible plate-shaped structure, the insulating body 31 is adhered to the frame 1, one side face of the insulating body 31 is adhered to the surface of the frame 1, for example, the insulating body 31 is adhered to the frame 1 through double faced adhesive tape, so that the insulating body 31 is tightly adhered to the surface of the frame 1, and connection between the insulating body 31 and the frame 1 is simple and reliable.

Specifically, the insulating body 31 is bonded to the frame 1 by double-sided tape.

In some embodiments, as shown in fig. 3, a heat rivet column 11 is arranged on the frame 1, a positioning hole is arranged on the aluminum row 2, the aluminum row 2 is sleeved on the heat rivet column 11 through the positioning hole, and the part of the heat rivet column 11 passing through the positioning hole is deformed through a heat rivet process and is abutted with the side surface of the aluminum row 2, which is away from the frame 1.

Specifically, the aluminum bar 2 is sleeved on the rivet stem 11 through the positioning hole and pressed against the top surface of the frame 1, and then the end of the rivet stem 11 is heated to press the aluminum bar 2, thereby realizing reliable installation of the aluminum bar 2 on the frame 1.

A battery pack according to an embodiment of the present utility model includes the battery cell sampling system 100 of any of the embodiments described above.

Technical advantages of the battery pack according to the embodiment of the present utility model are the same as those of the battery cell sampling system 100 of the above embodiment, and will not be described here again.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the utility model.

Claims

1. A cell sampling system, comprising:

a frame;

the aluminum rows are multiple and are connected with the frame; and

the circuit board, the circuit board including link to each other insulator with set up in conductor base plate on the insulator, the insulator with the frame links to each other, conductor base plate include a plurality of protrusion in the sampling branch of insulator surface, sampling branch with the aluminium row one-to-one, sampling branch support in corresponding one side of aluminium row and with corresponding the aluminium row links to each other.

2. The cell sampling system of claim 1, wherein the sampling branches comprise connected extension segments and welding segments, the extension segments being connected to a portion of the conductor substrate within the insulator body, the extension segments and the welding segments each being of a sheet-like configuration, the maximum width of the extension segments being less than the minimum width of the welding segments, the welding segments being connected to the aluminum row by ultrasonic welding.

3. The cell sampling system of claim 1, wherein the conductor substrate comprises a copper foil substrate, the sampling branches are made of calendered copper and protrude from edges of the insulating body, and the sampling branches are in abutting contact with sides of the respective aluminum rows facing away from the frame.

4. The cell sampling system according to claim 1, wherein the insulating body is elongated, and the plurality of sampling branches are respectively provided on both sides in the width direction of the insulating body.

5. The battery cell sampling system of claim 1, wherein the circuit board further comprises an NTC, the conductor substrate further comprises a connection portion protruding from an outer surface of the insulating body, and the NTC is detachably connected to the connection portion.

6. The cell sampling system of claim 5, further comprising a solder paste that connects the NTC and the connection in a thermal weld.

7. The cell sampling system of claim 1, wherein the circuit board further comprises a connector connected to the insulator body and electrically connected to the conductor substrate by a pierce crimp.

8. The cell sampling system of claim 1, wherein the insulator is a flexible plate-like structure, the insulator is bonded to the frame, and one of the sides of the insulator is bonded to a surface of the frame.

9. The cell sampling system according to claim 1, wherein a rivet stem is arranged on the frame, a positioning hole is arranged on the aluminum row, the aluminum row is sleeved on the rivet stem through the positioning hole, and a part of the rivet stem penetrating through the positioning hole is deformed through a rivet process and is abutted against the side surface of the aluminum row, which is away from the frame.

10. A battery pack comprising the cell sampling system of any one of claims 1-9.

11. A vehicle comprising the battery pack of claim 10.