CN220628126U

CN220628126U - Battery cell assembly, battery module and battery pack

Info

Publication number: CN220628126U
Application number: CN202322256540.3U
Authority: CN
Inventors: 李万明
Original assignee: Xiaomi Automobile Technology Co Ltd
Current assignee: Xiaomi Automobile Technology Co Ltd
Priority date: 2023-08-21
Filing date: 2023-08-21
Publication date: 2024-03-19
Anticipated expiration: 2033-08-21

Abstract

The utility model relates to a battery cell assembly, battery module and battery package, wherein, the battery cell assembly includes the electric core, the electric core is including stacking a plurality of electric core monomers of arranging, every electric core monomer both sides are equipped with the utmost point post respectively, the both sides of electric core are equipped with busbar, circuit board and connector respectively, the busbar is used for electrically connecting adjacent two the free utmost point post of electric core, the circuit board with the busbar electricity is connected, the connector sets up on the circuit board, the battery cell assembly still includes electric core sampling unit, is located the both sides of electric core the connector all electricity is connected to electric core sampling unit. Therefore, the shell of the battery cell can be prevented from being electrified, the safety of battery pack personnel can be ensured, and even when the shell blue film of the battery cell is locally damaged, the risk of short circuit of the adjacent battery cell is avoided, so that the safety performance of the battery pack is improved.

Description

Battery cell assembly, battery module and battery pack

Technical Field

The disclosure relates to the field of battery technology, and in particular relates to a battery cell assembly, a battery module and a battery pack.

Background

Currently, the main types of batteries include square cases, soft packages, blades, cylindrical batteries and the like, and the voltage and temperature sampling modes of the battery cells are different according to the different battery cell structures and the different positions of the polar columns. The battery cells with the poles on two sides, such as a blade battery, generally have long lengths, which can result in a long distance between the positive and negative electrodes.

In the related art, one side of a battery cell is provided with a battery cell sampling unit, the sampling unit can collect the potential of a certain level of the battery cell at the side, the other side of the battery cell is provided with a circuit board, the circuit board mainly achieves the function of transmitting the potential of the other side of the battery cell to a shell of the battery cell through the circuit board, the battery cell sampling unit at one side of the battery cell collects the potential of the other side of the battery cell through the potential of the shell, and the voltage of each battery cell is obtained through calculation. Because the circuit board needs to transmit the electric potential to the shell and lead the cell shell to be positively charged, potential safety hazards exist when battery pack assembly personnel operate, and when the blue film of the cell shell is locally damaged, the risk of short circuit exists between adjacent cells, so that the safety performance of the battery pack is influenced.

Disclosure of Invention

To overcome the problems in the related art, the present disclosure provides a battery cell assembly, a battery module, and a battery pack.

According to a first aspect of the disclosed embodiments, there is provided a battery cell assembly, including a battery cell, the battery cell includes a plurality of battery cell monomers of piling up and arranging, every battery cell monomer both sides are equipped with the utmost point post respectively, the both sides of battery cell are equipped with busbar, circuit board and connector respectively, the busbar is used for electrically connecting adjacent two battery cell monomer's utmost point post, the circuit board with the busbar electricity is connected, the connector sets up on the circuit board, the battery cell assembly still includes the battery cell sampling unit, is located the both sides of battery cell the connector all electricity is connected to the battery cell sampling unit.

Optionally, a temperature sensor for detecting the temperature of the battery cell is mounted on the circuit board.

Optionally, the battery cell assembly further includes fixing members disposed on two sides of the battery cell, the fixing members are formed with mounting grooves for mounting the bus bars, and the circuit board is fixed on the fixing members.

Optionally, the circuit board includes the main part that is used for the electricity to connect the busbar and integrative integration be in connecting portion on the main part, the main part is installed the mounting keep away from the one end of electric core, the through-hole has been seted up on the mounting, connecting portion pass the through-hole is pasted and is established on the electric core, temperature sensor installs on the connecting portion.

Optionally, a heat conducting member is arranged between the temperature sensor and the battery cell.

Optionally, the circuit board is electrically connected with the busbar through a nickel sheet.

Optionally, the cell assembly includes a plurality of the bus bars, and the plurality of the bus bars are arranged side by side along a stacking direction of the plurality of the cell units.

Optionally, each busbar is provided with two observation holes corresponding to the poles of the adjacent battery cells respectively.

Optionally, the connector is plugged with the cell sampling unit.

According to a second aspect of embodiments of the present disclosure, a battery module is provided, including the above-described battery cell assembly.

According to a third aspect of embodiments of the present disclosure, there is provided a battery pack including the above-described battery module.

The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects: after a plurality of electric core monomers are stacked, the polar posts on two sides are exposed, the bus bars are connected with the polar posts together, so that the serial-parallel connection of the whole module is realized, the circuit boards on two sides of the electric core are responsible for collecting the voltage of the electric core, collected voltage signals are transmitted to the electric core sampling units through the connectors, and the electric core sampling units can obtain the voltage information of each section of electric core monomers through calculation processing. Through the arrangement mode, the shell of the battery cell can be prevented from being electrified, the safety of battery pack personnel can be guaranteed, and moreover, even when the shell blue film of the battery cell is locally damaged, the risk of short circuit of the adjacent battery cell is avoided, and the safety performance of the battery pack is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.

FIG. 1 is a schematic diagram of a cell assembly according to an exemplary embodiment;

FIG. 2 is a split schematic of a cell assembly shown according to an exemplary embodiment;

fig. 3 is a schematic diagram of a circuit board in a cell assembly according to an exemplary embodiment.

Description of the reference numerals

1. Cell 11 cell unit

2 pole 3 busbar

31 observation hole 4 circuit board

41 main body 42 connecting portion

421 temperature sensor 5 connector

6 mounting groove for fixing piece 61

62 through hole 7 nickel sheet

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.

In the present disclosure, unless otherwise indicated, "inner" and "outer" are with respect to the outline of the corresponding parts themselves, and when the following description refers to the drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated.

Referring to fig. 1 to 3, the present disclosure provides a battery cell assembly, the battery cell assembly may include a battery cell 1, the battery cell 1 includes a plurality of battery cell monomers 11 that stack and arrange, both sides of each battery cell monomer 11 are equipped with a pole 2 respectively, both sides of the battery cell 1 are equipped with busbar 3, circuit board 4 and connector 5 respectively, busbar 3 is used for electrically connecting the pole 2 of the battery cell monomer 11 of adjacent two, specifically, busbar 3 welds on adjacent two poles 2, realizes switching on between the battery cell monomers 11. The circuit board 4 is electrically connected with the busbar 3, the connector 5 is arranged on the circuit board 4, the battery cell assembly further comprises a battery cell sampling unit, and the connectors 5 positioned on two sides of the battery cell 1 are electrically connected to the battery cell sampling unit. The battery cell component is mainly applied to voltage sampling of battery cells of the side-out polar column, and the battery cells of the side-out polar column can be a blade battery or a square shell battery of the side-out polar column.

Through the technical scheme, after a plurality of battery cell monomers are stacked, the poles on two sides are exposed, the bus bars are connected with the poles together, so that the serial-parallel connection of the whole module is realized, the circuit boards on two sides of the battery cells are responsible for collecting the voltage of the battery cells, the collected voltage signals are transmitted to the battery cell sampling units through the connectors, and the battery cell sampling units can obtain the voltage information of each battery cell monomer through calculation. Through the arrangement mode, the shell of the battery cell can be prevented from being electrified, the safety of battery pack personnel can be ensured, and even when the blue film of the shell of the battery cell is locally damaged, the risk of short circuit of the adjacent battery cell is avoided, so that the safety performance of the battery pack is improved.

As an exemplary embodiment of the present disclosure, referring to fig. 3, a temperature sensor 421 for detecting the temperature of the battery cell 1 may be mounted on the circuit board 4. The temperature sensor 421 is attached to the battery cell 1, so that the temperature of the battery cell is sampled, and the circuit board 4 can collect temperature information of the battery cell 1. Integrating the temperature sensor 421 on the circuit board 4 can reduce the use of the wiring harness, realize the high integration of the battery pack, and improve the assembly efficiency. It should be noted that the specific number and arrangement positions of the temperature sensors 421 may be selected and arranged according to the thermal management requirements, which is not limited by the present disclosure.

In some embodiments, referring to fig. 1 and 2, the cell assembly may further include fixing members 6 disposed at both sides of the cell 1, and the fixing members 6 may be formed with mounting grooves 61 for mounting the bus bars 3, and the circuit board 4 is fixed to the fixing members 6. Wherein, the material of mounting 6 can be plastics, and mounting 6 is used for bearing and installing busbar 3 and circuit board 4, and with busbar 3 and circuit board 4 integration to mounting 6 on, can reduce battery package part, simplify battery package installation procedure, the automatic equipment of being convenient for improves production efficiency, has realized that the battery package integrates, lightweight, miniaturization, the cost is reduced. In other embodiments, the busbar 3 and the circuit board 4 may be packaged in a form selected from the group consisting of hot pressing, suction molding, and the like, depending on factors such as installation space and cost.

Referring to fig. 1 and 2, the circuit board 4 may include a main body portion 41 for electrically connecting the busbar 3 and a connection portion 42 integrally integrated on the main body portion 41, the main body portion 41 is mounted at one end of the fixing member 6 far away from the battery cell 1, a through hole 62 may be formed in the fixing member 6, the connection portion 42 passes through the through hole 62 and is attached to the battery cell 1, and the temperature sensor 421 is mounted on the connection portion 42 to be capable of collecting temperature information of the battery cell 1. It should be noted that, the mounting structure of the circuit board 4 and the temperature sensor 421 is not limited to the above-mentioned case, and it is enough that the temperature sensor 421 can be integrated on the circuit board 4 and the temperature sensor 421 can be attached to the battery cell 1, which all fall into the protection scope of the disclosure.

Further, a heat conducting member can be arranged between the temperature sensor 421 and the battery cell 1, specifically, the heat conducting member can be a heat conducting glue or a heat conducting pad, and the temperature of the battery cell 1 can be more accurately sampled by arranging the heat conducting member, so that the temperature of the battery cell 1 is collected.

According to some embodiments, referring to fig. 1, the circuit board 4 and the bus bar 3 may be electrically connected by a nickel plate 7. Specifically, the nickel sheet 7 may be fixed to the busbar 3 by welding or other means, and the circuit boards 4 located on both sides of the battery cell 1 may enable the collection of the potentials of the two electrodes of the battery cell 1 so as to obtain the voltage of the battery cell 1.

Specifically, referring to fig. 1 and 2, the cell assembly may include a plurality of bus bars 3, and the plurality of bus bars 3 are arranged side by side in the stacking direction of the plurality of cell units 11. Each busbar 3 is used for electrically connecting the poles 2 of two adjacent battery cells 11. As shown in fig. 1, a plurality of bus bars 3 are mounted on the fixture 6 in the stacking direction of a plurality of battery cells 11, and voltage information on each bus bar 3 can be collected through the circuit board 4.

In some embodiments, referring to fig. 1 and 2, each busbar 3 may be provided with two observation holes 31 corresponding to the posts 2 of the adjacent cells 11. An observation hole 31 is opened at a position of the bus bar 3 corresponding to the pole 2 so that the position of the pole 2 can be observed at the observation hole 31, and positional deviation is avoided when the bus bar 3 is welded. Specifically, as shown in fig. 2, the observation hole 31 may be configured as a circular hole or a square hole corresponding to the shape of the pole 2.

In the embodiment of the disclosure, the connector 5 can be plugged with the cell sampling unit, so that the arrangement structure is simple, the installation is convenient, and the integration level is high. In other embodiments, the connector 5 may be connected to the cell sampling unit through a wire harness, so that the signal collected by the circuit board 4 through the connector 5 is transmitted to the cell sampling unit, and in particular, the cell sampling unit may be fixed on a side wall of the cell 1.

According to a second aspect of the present disclosure, there is also provided a battery module, which may include the above-described battery cell assembly. The air conditioner has all the beneficial effects of the battery cell assembly, and redundant description is omitted here.

According to a third aspect of the present disclosure, there is also provided a battery pack, which may include the above-described battery module. The battery pack has all the beneficial effects of the battery module and the battery cell assembly, and is not repeated here.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure. This disclosure is intended to cover any adaptations, uses, or adaptations of the disclosure following the general principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. The utility model provides a battery cell assembly, its characterized in that, includes the electric core, the electric core is including stacking a plurality of electric core monomers of arranging, every electric core monomer both sides are equipped with the utmost point post respectively, electric core's both sides are equipped with busbar, circuit board and connector respectively, the busbar is used for electrically connecting adjacent two electric core monomer's utmost point post, the circuit board with the busbar electricity is connected, the connector sets up on the circuit board, the battery cell assembly still includes electric core sampling unit, is located electric core's both sides the equal electricity of connector is connected to electric core sampling unit.

2. The cell assembly of claim 1, wherein the circuit board has mounted thereon a temperature sensor for detecting the temperature of the cell.

3. The cell assembly of claim 2, further comprising fixing members provided at both sides of the cell, the fixing members being formed with mounting grooves for mounting the bus bars, the circuit board being fixed to the fixing members.

4. The battery cell assembly according to claim 3, wherein the circuit board comprises a main body part for electrically connecting the bus bars and a connecting part integrally integrated on the main body part, the main body part is mounted at one end of the fixing piece far away from the battery cell, a through hole is formed in the fixing piece, the connecting part penetrates through the through hole and is attached to the battery cell, and the temperature sensor is mounted on the connecting part.

5. The cell assembly of claim 2, wherein a thermally conductive member is disposed between the temperature sensor and the cell.

6. The cell assembly of claim 1, wherein the circuit board is electrically connected to the buss bar by a nickel plate.

7. The cell assembly of claim 1, wherein the cell assembly comprises a plurality of the bus bars arranged side by side along a stacking direction of the plurality of cell units.

8. The cell assembly of claim 7, wherein each of the bus bars is provided with two viewing holes corresponding to the posts of adjacent cell units.

9. The cell assembly of claim 1, wherein the connector mates with the cell sampling unit.

10. A battery module comprising the cell assembly of any one of claims 1-9.

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