Battery pack FPC acquisition connection structure

Abstract

The utility model discloses a battery pack FPC (Flexible Printed Circuit) acquisition and connection structure, which comprises a plurality of connection bars used for connecting a plurality of battery cell monomers in series and in parallel, and acquisition circuit boards arranged on the battery cell monomers and respectively connected with the connection bars, and the acquisition circuit boards are copper-based FPC boards integrally manufactured and formed by copper base materials. The copper-based FPC board is provided with a plurality of connecting bars and a plurality of sampling terminals which extend outwards and are connected with the plurality of connecting bars, the connecting bars are formed by integrally compounding aluminum bar main body parts and copper bar combination parts, the sampling terminals of the copper-based FPC board are welded on the copper bar combination parts of the connecting bars, and since the sampling terminals and the copper bar combination parts are copper, the bonding property of the same metal is better, and the service life of the copper-based FPC board is prolonged. According to the utility model, the copper-based FPC board and the connecting bar are connected in a welding manner, and the FPC board can be used for normally acquiring information such as voltage and temperature of the battery pack, so that the welding requirement between the copper-based FPC board and the connecting bar can be met, and the production cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and particularly relates to a battery pack FPC acquisition and connection structure. Background Art

[0002] With the popularization of new energy vehicles, new energy vehicles powered by power batteries will gradually replace existing fuel vehicles. As the core of the energy system of new energy vehicles, the safety, reliability, beauty and convenience of power batteries have increasingly become the focus of attention of vehicle manufacturers and consumers. Existing power batteries mainly consist of a plastic shell, multiple battery cell units, aluminum bars, and an FPC acquisition board. Multiple battery cell units are connected in parallel and in series through multiple aluminum bars. The FPC acquisition board is connected to multiple aluminum bars through multiple acquisition chips to achieve the purpose of acquiring information such as the voltage and temperature of the battery module. Due to the good electrical properties of copper, this FPC acquisition board is usually made of copper as the base material. Since the cost of aluminum is relatively lower than that of copper, aluminum bars are usually used to connect between the battery cell units of power batteries. Aluminum is an active metal and easily forms aluminum oxide on its surface. It is impossible to weld a copper-based FPC acquisition board on the aluminum bar using traditional welding techniques, and thus it is impossible to normally acquire information such as the voltage of the battery cell unit. Content of the Utility Model

[0003] Therefore, the technical problem to be solved by the utility model is to overcome the problem in the prior art that a copper-based FPC acquisition board cannot be welded on the aluminum bar of the battery cell, thus unable to normally acquire information such as the voltage of the battery cell unit.

[0004] To solve the above technical problem, the utility model provides a battery pack FPC acquisition and connection structure, which includes multiple battery cell monomers and multiple connection bars for series and parallel connection between the multiple battery cell monomers, and an acquisition circuit board arranged on the multiple battery cell monomers and respectively connected to the multiple connection bars. The acquisition circuit board is a copper-based FPC board integrally formed by a copper base material and has multiple sampling terminals extending outward to connect to the multiple connection bars. The connection bar includes an aluminum bar main body part and a copper bar bonding part arranged on the aluminum bar main body part, and the sampling terminal is welded on the copper bar bonding part.

[0005] As a preferred solution, the connection bar is a copper-aluminum bar structure in which the aluminum bar main body part and the copper bar bonding part are integrally formed.

[0006] As a preferred solution, the connection bar connects two adjacent battery cell monomers through the aluminum bar main body part, and is in contact with and welded to one of the sampling terminals of the copper-based FPC board through the copper bar bonding part.

[0007] As a preferred solution, the copper row joint is formed on the aluminum row main body and is disposed close to the copper-based FPC board. A connection groove that semi-surrounds the copper row joint is formed on the side of the aluminum row main body close to the copper-based FPC board. A side opening is formed on the side edge of the aluminum row main body on the side close to the copper-based FPC board. The copper row joint and the connection groove are respectively rectangular in shape, such that one side edge of the copper row joint is located at the side opening and is flush with one side edge of the aluminum row main body.

[0008] As a preferred solution, the sampling terminal is a copper foil sheet structure integrally formed on the side edge of the copper-based FPC board and extending outward.

[0009] As a preferred solution, the sampling terminal includes a collecting piece welded to the partial copper row, and a bending piece that bends and extends to connect the collecting piece and one side edge of the copper-based FPC board. The bending piece can be bent and deformed under an external force.

[0010] As a preferred solution, a plurality of groove portions connected to a plurality of sampling terminals are provided on both side edges of the copper-based FPC board. One end of the bending piece is connected to the bottom edge of the groove portion, and the other end thereof is connected to the collecting piece body. The bending piece is received in the groove portion, and a connection protrusion connected to the side edge of the groove portion is provided.

[0011] As a preferred solution, the bending piece, the connection protrusion and the groove portion are connected to form a closed buffer groove.

[0012] The technical solution of the present utility model has the following advantages compared with the prior art:

[0013] 1. In the battery pack FPC acquisition connection structure provided by the present utility model, since the acquisition circuit board is a copper-based FPC board integrally made of copper substrate, this connection row is mainly composed of an aluminum row main body and a copper row joint, that is, a copper-aluminum composite structure design is adopted, which has the characteristics of high bonding strength, excellent electrical conductivity and thermal conductivity, easy welding, and low contact resistance. The series-parallel connection between each battery cell unit is realized through the connection row, and then the sampling terminal of the copper-based FPC board is welded to the position of the copper row joint of the connection row. Since both the sampling terminal and the copper row joint are copper in nature, the bonding of the same metal is better, the welding strength is high and the contact surface is large, and the connection stability is good, improving the electrical contact performance, thereby realizing the welding connection between the copper-based FPC board and the connection row, solving the problem that the copper-based FPC board cannot be welded to the aluminum row by using the traditional welding technology. In this way, the voltage, temperature and other information of the battery pack can be normally collected through the FPC board, and the cost is saved, and the product use performance is improved.

[0014] 2. In the battery pack FPC acquisition connection structure provided by the present utility model, the sampling terminal is composed of a collection piece body and a bent piece, and the bent piece is accommodated in a groove formed on the side of the copper-based FPC board. The advantage of adopting this technical solution is that when the battery pack expands and deforms, the sampling terminal designed with this bending structure can generate an appropriate amount of bending deformation, and further play a role in buffering deformation through the buffer groove between the sampling terminal and the copper-based FPC board, increasing the amount of deformation, having strong load-bearing capacity, and preventing the sampling terminal from being easily pulled off the solder joint or torn under the action of the expansion and deformation of the battery pack. Thus, the sampling terminal can still be connected to the connection row when the battery pack deforms, ensuring the installation stability and reliability between the sampling terminal and the connection row, and improving the service life and performance of the product.

[0015] 3. In the battery pack FPC acquisition connection structure provided by the present utility model, by providing a connection protrusion on the bent piece of the sampling terminal that is connected to the side of the groove, with this structural setting, the connection protrusion can break when subjected to an external force, enabling the bent piece to bend and deform relative to the collection piece and the copper-based FPC board to adapt to the expansion displacement of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 Schematic diagram of the three-dimensional structure of the battery pack FPC acquisition connection structure provided by the utility model;

[0018] Figure 2 Schematic diagram of the planar structure of the battery pack FPC acquisition connection structure provided by the utility model;

[0019] Figure 3 For Figure 1 Partial enlarged schematic diagram of the FPC temperature acquisition structure shown.

[0020] BRIEF DESCRIPTION OF THE DRAWINGS: 1. Copper-based FPC board; 11. Groove; 2. Connection row; 21. Aluminum row main part; 22. Copper row joint part; 3. Sampling terminal; 4. Collection piece; 5. Bent piece; 6. Connection protrusion; 7. Buffer groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can also be the communication inside two components. It can be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0023] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] Embodiment

[0025] The present utility model provides a battery pack FPC acquisition and connection structure as Figures 1-3 shown, which includes a plurality of battery cell monomers and a plurality of connection rows 2 for series and parallel connection between the plurality of battery cell monomers, and an acquisition circuit board provided on the plurality of battery cell monomers and respectively connected to the plurality of connection rows 2. The acquisition circuit board is a copper-based FPC board 1 integrally formed by a copper substrate, and has a plurality of sampling terminals 3 extending outward to connect the plurality of connection rows 2. The connection row 2 includes an aluminum row main body portion 21 and a copper row bonding portion 22 provided on the aluminum row main body portion 21. The sampling terminal 3 is welded to the copper row bonding portion 22. It can be seen that the proportion of the aluminum row part in the connection row 2 is larger than that of the copper row part. By reasonably optimizing the layout of the copper-aluminum row ratio, it can not only meet the welding requirements between the copper-based FPC board 1 and the connection row 2, but also reduce the production cost and improve the product use performance.

[0026] In the above embodiments, the acquisition circuit board is a copper-based FPC board 1 integrally formed from a copper substrate. This connection row 2 is composed of an aluminum row main body 21 and a copper row joint 22, that is, a copper-aluminum composite structure design is adopted, which has the characteristics of high bonding strength, excellent electrical and thermal conductivity, easy welding, and low contact resistance. The series-parallel connection between each battery cell unit is realized through the connection row 2, and then the sampling terminal 3 of the copper-based FPC board 1 is welded to the copper row joint 22 of the connection row 2. Since both the sampling terminal 3 and the copper row joint 22 are copper in nature, the bonding of the same metal is better, the welding strength is high and the contact surface is large, and the connection stability is good, improving the electrical contact performance, thereby realizing the welded connection between the copper-based FPC board 1 and the connection row 2, solving the problem that the copper-based FPC board cannot be welded on the aluminum row using traditional welding technology. In this way, the voltage, temperature and other information of the battery pack can be normally collected through the FPC board, saving costs and improving the product performance.

[0027] As a specific structural setting, the connection row 2 is a copper-aluminum row structure in which the aluminum row main body 21 and the copper row joint 22 are integrally formed. That is, the main part of the connection row 2 is made of an aluminum row, and its composite part is a copper row locally formed on the aluminum row. The connection row 2 connects two adjacent battery cell monomers through the aluminum row main body 21, and is in contact and welded with one of the sampling terminals 3 of the copper-based FPC board 1 through the copper row joint 22. The sampling terminal 3 is a copper foil structure integrally formed on the side of the copper-based FPC board 1 and extending outward. By applying solder paste on the sampling terminal 3 and bringing it into contact with the copper row part of the connection row 2, and then realizing the welding between the sampling terminal 3 and the copper row joint 22 through the reflow soldering method, the connection between the copper-aluminum composite formed connection row 2 and the copper-based FPC board 1 is realized by using the traditional welding process, effectively overcoming the bottleneck in the application of the FPC with a copper substrate in new energy battery packs and improving the product performance.

[0028] Such as Figures 1-2As shown, the copper busbar joint 22 is formed on the aluminum busbar main body 21 and is close to the copper-based FPC board 1. A connection groove that semi-surrounds the copper busbar joint 22 is formed on the side of the aluminum busbar main body 21 close to the copper-based FPC board 1. A side opening is provided on the side edge of the aluminum busbar main body 21 close to the copper-based FPC board 1 for this connection groove. The copper busbar joint 22 and the connection groove are respectively rectangular in shape, so that one side edge of the copper busbar joint 22 is located at the side opening and is flush with one side edge of the aluminum busbar main body 21. With this structural arrangement, the sampling terminal 3 can be directly surface-mounted and welded at the position of the copper busbar joint of the connection row 2 by SMT process, and will not come into contact with the aluminum busbar main body 21. The conductive performance of the combination of the same attributes is better, the heat dissipation is also good, the welding structural strength is high, and the cost-benefit is good, which is suitable for the mass production requirements of products.

[0029] The following will combine Figures 1-3 to make a detailed description of the specific structure of the sampling terminal:

[0030] The sampling terminal 3 includes a collecting piece 4 welded to the local copper busbar, and a bending piece 5 that bends and extends to connect the collecting piece 4 to one side edge of the copper-based FPC board 1. The bending piece 5 can be bent and deformed under an external force. The advantage of adopting this technical solution is that when the battery pack expands and deforms, the sampling terminal 3 with this bending structure design can be bent appropriately to obtain a certain deformation displacement amount, improving the load-bearing capacity of the sampling terminal 3, and preventing the sampling terminal 3 from being easily pulled off the solder joint or torn under the action of the expansion deformation force of the battery pack. Thus, the sampling terminal can still be connected to the connection row 2 when the battery pack expands, ensuring the stability and reliability of the connection between the sampling terminal 3 and the connection row 2, and improving the service life and performance of the product.

[0031] Further preferably, a plurality of groove parts 11 connected to a plurality of sampling terminals 3 are provided on both side edges of the copper-based FPC board 1. One end of the bending piece 5 is connected to the bottom edge of the groove part 11, and the other end is connected to the body of the collecting piece 4. The bending piece 5 is accommodated in the groove part 11, and a connection protrusion 6 connected to the side edge of the groove part 11 is provided. The groove part 11 can provide a position space for the deformation activity of the bending piece 5. The bending piece 5, the connection protrusion 6 and the groove part 11 are connected to form a closed buffer groove 7. Through the buffer groove 7, the sampling terminal 3 in a stressed state can be further buffered against deformation, increasing the deformation amount and having a good force buffering effect. With the above structural arrangement, the connection protrusion 6 can be disconnected under an external force, so that the bending piece 5 can bend and deform relative to the collecting piece and the copper-based FPC board, and can better adapt to the expansion displacement of the battery pack.

[0032] Obviously, the above embodiments are merely examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. And the obvious changes or variations derived therefrom still fall within the protection scope of this utility model creation.

Claims

1. A battery pack FPC collection connection structure, comprising a plurality of battery cells and a plurality of connection bars (2) for connecting the plurality of battery cells in series and in parallel, and a collection circuit board arranged on the plurality of battery cells and respectively connected to the plurality of connection bars (2), characterized in that The acquisition circuit board is a copper-based FPC board (1) integrally formed from a copper substrate, and has a plurality of sampling terminals (3) extending outwardly to connect a plurality of the connection bars (2); the connection bars (2) include an aluminum bar main body (21) and a copper bar joint part (22) partially disposed on the aluminum bar main body (21); and the sampling terminals (3) are welded to the copper bar joint part (22).

2. According to claim 1, a battery pack FPC collection connection structure is characterized in that: The connecting bar (2) is a copper-aluminum bar structure formed by integrally compositely forming the aluminum bar main body (21) and the copper bar joint (22).

3. According to claim 2, a battery pack FPC collection connection structure is characterized in that: The connection bar (2) connects two adjacent battery cells via an aluminum bar main body (21), and is in contact with and welded to one of the sampling terminals (3) of the copper-based FPC board (1) via a copper bar joint (22).

4. A battery pack FPC collection connection structure according to any one of claims 1 to 3, characterized in that: The copper bar joint portion (22) is formed on the aluminum bar main body (21) and is arranged close to the copper-based FPC board (1). A connection groove that semi-encloses the copper bar joint portion (22) is formed on the side of the aluminum bar main body (21) close to the copper-based FPC board (1). The connection groove is provided with a side opening on the side of the aluminum bar main body (21) close to the copper-based FPC board (1). The copper bar joint portion (22) and the connection groove are respectively rectangular in shape, so that one side of the copper bar joint portion (22) is located at the side opening and is kept flush with one side of the aluminum bar main body (21).

5. According to claim 1, a battery pack FPC collection connection structure is characterized in that: The sampling terminal (3) is a copper foil structure integrally formed on the side of the copper-based FPC board (1) and extending outwards.

6. A battery pack FPC collection connection structure according to claim 5, characterized in that: The sampling terminal (3) comprises a sampling piece (4) welded to a copper busbar joint, and a bending piece (5) bent and extended to connect the sampling piece (4) and a side edge of one side of the copper-based FPC board (1); the bending piece (5) can be bent and deformed under the action of an external force.

7. A battery pack FPC collection connection structure according to claim 6, characterized in that: A plurality of grooves (11) connected to a plurality of sampling terminals (3) are provided on both side edges of the copper-based FPC board (1); one end of the bending piece (5) is connected to the bottom edge of the groove (11), and the other end is connected to the main body of the sampling piece (4); the bending piece (5) is accommodated in the groove (11) and is provided with a connecting protrusion (6) connected to the side edge of the groove (11).

8. A battery pack FPC collection connection structure according to claim 7, characterized in that: The bending piece (5), the connecting protrusion (6) and the groove portion (11) are connected to form a closed buffer groove (7).

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