Auxiliary battery electrical module and auxiliary battery system

Abstract

The utility model discloses an auxiliary battery electrical module and an auxiliary battery system. The auxiliary battery electrical module comprises a printed circuit board, a relay, a first connecting copper bar, a battery cell module and a series copper bar; the relay is mounted on the printed circuit board; the first connecting copper bar is connected with the relay; the battery cell module is positioned on one side, opposite to the printed circuit board, of the printed circuit board; the series copper bar comprises a first pin, a copper bar main body and a second pin which are connected in sequence, the copper bar main body, the first pin and the second pin are arranged in a staggered manner, the first pin is connected with the first connecting copper bar, and the second pin is connected with the battery cell module. According to the embodiment of the invention, the distance between the series copper bar and the connector and the distance between the first connecting copper bar and the connector are increased, so that the interference on the communication of the whole vehicle during overcurrent can be reduced, the influence on the durability of the connector during heating can be reduced, the stress on the printed circuit board during welding with the printed circuit board can be reduced, and the reliability of the whole vehicle is improved. And the product quality of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle batteries, and particularly relates to an auxiliary battery electrical module and an auxiliary battery system. Background Art

[0002] The current 12V lithium-ion battery system is still in the stage of innovative research and development. Compared with lead-acid batteries, it has not formed a complete and standardized system. Especially, the battery size and interface position cannot be unified, resulting in various shapes and sizes of battery systems of the same specification. Moreover, the communication interface position and specification with the whole vehicle are not unified, and usually, personalized customization is carried out according to different requirements of different customers, which leads to different battery interface positions.

[0003] The internal connection structure of the battery needs to be arranged and connected according to the external interface position with the whole vehicle. Limited by the positions of relays and connectors, the change of the external interface position may lead to unreasonable internal structure connection. If the P+ copper bar is directly welded to the board and integrated with the Battery Management System (BMS), the following risks will occur: ① The connector wire harness needs to pass under the P+ copper bar. When there is a large current in the P+ copper bar, it will cause interference to signal transmission, resulting in unstable signal transmission and affecting communication with the whole vehicle; ② The connector is relatively close to the P+ copper bar. The P+ copper bar needs to pass a large current and is a large heat source. The connector being in the vicinity of the heat source for a long time will reduce its durability; ③ The P+ copper bar is too long. During the trial production process, after welding, the Printed Circuit Board (PCB) bends around the P+ copper bar, generating great stress on the PCB board, and the components on the PCB board may fall off due to the stress.

[0004] In summary, the existing lithium-ion batteries have technical problems such as poor communication signals, abnormal heating, or component damage and detachment. Summary of the Utility Model

[0005] The purpose of this application is to overcome the above technical deficiencies, and propose an auxiliary battery electrical module and an auxiliary battery system to solve the technical problems of poor communication signals, abnormal heating, or component damage and detachment existing in the prior art.

[0006] To achieve the above technical purpose, this application adopts the following technical solutions:

[0007] In the first aspect, this application provides an auxiliary battery electrical module, including a printed circuit board, a relay, a first connection copper bar, a battery cell module, and a series copper bar:

[0008] Printed circuit board;

[0009] A relay, the relay being mounted on the printed circuit board;

[0010] A first connecting copper bar, the first connecting copper bar being connected to the relay;

[0011] A battery cell module, the battery cell module being located on a side of the printed circuit board facing away from the printed circuit board; and

[0012] A series connecting copper bar, the series connecting copper bar including a first pin, a copper bar main body, and a second pin connected in sequence, the copper bar main body being arranged with a staggered layer with respect to the first pin and the second pin, the first pin being connected to the first connecting copper bar, and the second pin being connected to the battery cell module.

[0013] In some embodiments of the present application, a module positive copper bar is further included, the module positive copper bar including two bent portions perpendicular to each other, the two bent portions being respectively connected to the battery cell module and the series connecting copper bar.

[0014] In some embodiments of the present application, the first pin is attached to a surface of the first connecting copper bar facing away from the printed circuit board, the second pin is attached to a surface of the module positive copper bar facing away from the printed circuit board, and the copper bar main body is arranged at an interval from the printed circuit board.

[0015] In some embodiments of the present application, a second connecting copper bar, a positive output copper bar, and a positive pole column are further included, the second connecting copper bar being connected to the relay, the positive output copper bar being connected to the second connecting copper bar, and the positive pole column being connected to the positive output copper bar.

[0016] In some embodiments of the present application, the battery cell module includes a plurality of soft-pack battery cells, the plurality of soft-pack battery cells being connected in series and stacked, and an elastic member is arranged between adjacent two soft-pack battery cells.

[0017] In some embodiments of the present application, a flexible circuit collecting board is further included, the flexible circuit collecting board being located on a side of the battery cell module and connected to the battery cell module.

[0018] In some embodiments of the present application, a connector and a communication line are further included, the connector being located at an edge of the printed circuit board, and the communication line being connected to the connector.

[0019] In a second aspect, the present application further provides an auxiliary battery system, including a housing and the auxiliary battery electrical module as described in any one of the embodiments in the first aspect, the housing having a hollow cavity, and the auxiliary battery electrical module being placed in the cavity.

[0020] In some embodiments of the present application, the housing includes a box body and a pressing plate. The battery module in the auxiliary battery electrical module is placed in the box body, and the pressing plate presses on the battery module.

[0021] In some embodiments of the present application, the housing includes a cover body. The printed circuit board, the first connection copper bar, and the series connection copper bar in the auxiliary battery electrical module are fixedly installed on the cover body.

[0022] Compared with the prior art, the beneficial technical effects brought by the technical solution provided in the present application include: In the embodiments of the present application, by designing the series connection copper bar, the series connection copper bar bridges the first connection copper bar and the battery cell module. Compared with the direct connection between the first connection copper bar and the battery cell module, the length of the first connection copper bar is reduced, the position of the overcurrent interface of the relay is changed, and the distance between the first connection copper bar and the connector is increased. This can not only reduce the interference to the communication between the battery management system assembly and the vehicle during overcurrent, but also reduce the impact on the durability of the connector during heating, and can also reduce the stress on the printed circuit board during welding with the printed circuit board, reducing the risk of component detachment caused by the bending deformation of the printed circuit board; and the copper bar body of the series connection copper bar is arranged in a staggered layer with a spacing from the printed circuit board, so the series connection copper bar has less interference to communication and less impact on the connector, and will not apply stress to the printed circuit board, improving the product quality of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present application, the following will briefly introduce the drawings required in the embodiments:

[0024] Figure 1 is a schematic structural diagram of an auxiliary battery electrical module provided by an embodiment of the present application;

[0025] Figure 2 is a schematic layout diagram of a printed circuit board provided by an embodiment of the present application;

[0026] Figure 3 is a schematic structural diagram of a battery cell module provided by an embodiment of the present application;

[0027] Figure 4 is a schematic structural diagram of an auxiliary battery system provided by an embodiment of the present application;

[0028] Figure 5 is an exploded view of an auxiliary battery system provided by an embodiment of the present application.

[0029] Reference numerals:

[0030] 1 - Printed circuit board, 2 - Relay, 3 - First connecting copper bar, 4 - Battery cell module, 5 - Series copper bar, 51 - First pin, 52 - Copper bar body, 53 - Second pin, 6 - Module positive copper bar, 7 - Second connecting copper bar, 8 - Positive output copper bar, 9 - Positive terminal, 10 - BMS, 11 - Flexible circuit acquisition board, 12 - Connector, 13 - Communication line, 14 - Communication interface, 15 - Pressure relief and exhaust device, 16 - Box body, 17 - Pressure plate, 18 - Cover body, 19 - Shunt, 20 - Foam. Detailed implementation manners

[0031] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0032] Those skilled in the art of the present technology can understand that in this specification, the term "including" is an open-ended expression, which means that there are the described features but does not exclude other features. The orientation terms "upper", "lower", "left", "right", etc. are exemplary directions based on the accompanying drawings. Features defined with "first" and "second" implicitly include one or more of such features. The singular form can also be used for the plural form. The meaning of "a plurality" is two or more. The terms "installation", "connection", and "connection" can be a fixed connection, a detachable connection, or an integral connection; they can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. In addition, "connection" can include wireless connection.

[0033] The objective of the present application is to overcome the above technical deficiencies, and propose an auxiliary battery electrical module and an auxiliary battery system to solve the technical problems of poor communication signals, abnormal heating, or component damage and detachment in the prior art.

[0034] To achieve the above technical objectives, the present application has taken the following technical solutions:

[0035] In the first aspect, the present application provides an auxiliary battery electrical module, as Figures 1-3 shown, Figure 1 is a schematic structural diagram of an auxiliary battery electrical module provided by an embodiment of the present application; Figure 2 is a layout schematic diagram of a printed circuit board 1 provided by an embodiment of the present application; Figure 3 is a schematic structural diagram of a battery cell module 4 provided by an embodiment of the present application.

[0036] An auxiliary battery electrical module includes a printed circuit board 1, a relay 2, a first connecting copper bar 3, a battery cell module 4, and a series copper bar 5:

[0037] Printed circuit board 1;

[0038] A relay 2, wherein the relay 2 is mounted on the printed circuit board 1;

[0039] A first connecting copper bar 3, wherein the first connecting copper bar 3 is connected to the relay 2;

[0040] A battery cell module 4, wherein the battery cell module 4 is located on a side of the printed circuit board 1 facing away from the printed circuit board 1; and

[0041] The series copper busbar 5 includes a first pin 51, a copper busbar body 52 and a second pin 53 connected in sequence, the copper busbar body 52 and the first pin 51 and the second pin 53 are arranged in staggered layers, the first pin 51 is connected to the first connecting copper busbar 3, and the second pin 53 is connected to the battery module 4.

[0042] This embodiment mainly solves the problem of unreasonable connection due to space and layout restrictions on the internal structure of the battery, that is, the direct connection between the BMS10 overcurrent interface and the module overcurrent interface will affect the BMS10 communication function, and the passage of large current will cause heat accumulation; this embodiment adopts the method of changing the position of the BMS10 overcurrent interface and connecting the BMS10 to the module through a separate series copper bus 5. After multiple soft-pack battery cells are stacked in series, they can reach a working platform voltage of more than 12V by welding, and then a battery system is formed by a supporting module supporting the battery cell, a battery housing and electronic components. The battery system provides an output terminal, a communication interface 14, and an exhaust channel connected to the whole vehicle. The battery pack can communicate directly with the whole vehicle through the Lin interface.

[0043] In the embodiment of the present application, a series copper bar 5 is designed, and the series copper bar 5 bridges the first connection copper bar 3 and the battery module 4. Compared with the direct connection between the first connection copper bar 3 and the battery module 4, the length of the first connection copper bar 3 is reduced, the position of the overcurrent interface of the relay 2 is changed, and the distance between the first connection copper bar 3 and the connector 12 is increased, which can reduce the interference to the battery management system 10 assembly and the communication with the whole vehicle when overcurrent occurs, and reduce the impact on the durability of the docking plug 12 when heating. It can also reduce the stress on the printed circuit board 1 when welding with the printed circuit board 1, and reduce the risk of components falling off due to bending and deformation of the printed circuit board 1; and the copper bar body 52 of the series copper bar 5 is staggered and spaced from the printed circuit board 1, the series copper bar 5 has less interference to the communication and less impact on the docking plug 12, and will not exert stress on the printed circuit board 1, thereby improving the product quality of the battery.

[0044] Since the position of the communication interface 14 of the cover 18 stipulated by the customer cannot be moved, in order to ensure the communication transfer between the BMS 10 and the cover 18, the connector 12 on the BMS 10 must be located at the position shown in the figure to ensure the feasibility of connecting with the cover 18. At the same time, the first connection copper row 3 welded on the BMS 10 needs to be connected to the module positive copper row 6 on the battery cell module 4, resulting in the wiring of the connector 12 on the BMS 10 board passing under the first connection copper row 3. When the first connection copper row 3 has a large current during battery system power-on, it will cause heating and affect the wiring of the connector 12 to interfere with communication. Therefore, the first connection copper row 3 is optimized, and its connection interface is changed to Figure 1 the position shown in the figure, and is transferred through the series connection copper row 5 and connected to the module copper row, so as to avoid the heat accumulation caused by the overcurrent of the copper row and the interference effect on the wiring of the connector 12.

[0045] In some embodiments of the present application, it further includes a module positive copper row 6, and the module positive copper row 6 includes two bent parts perpendicular to each other, and the two bent parts are respectively connected to the battery cell module 4 and the series connection copper row 5.

[0046] In some embodiments of the present application, the first pin 51 is attached to the surface of the first connection copper row 3 facing away from the printed circuit board 1, the second pin 53 is attached to the surface of the module positive copper row 6 facing away from the printed circuit board 1, and the copper row body 52 is spaced from the printed circuit board 1.

[0047] In this embodiment, the series connection copper row 5 is designed as a "concave"-shaped copper row part and is not welded to the PCB board 1 to avoid applying stress to the PCB board 1.

[0048] In some embodiments of the present application, it further includes a second connection copper row 7, a positive output copper row 8 and a positive pole column 9. The second connection copper row 7 is connected to the relay 2, the positive output copper row 8 is connected to the second connection copper row 7, and the positive pole column 9 is connected to the positive output copper row 8.

[0049] Figure 2 The electrical module in it includes: the battery cover 18 as a carrier, on which the BMS 10 is fixed to monitor the battery state, control the switch of the relay 2, and communicate with the whole vehicle. The relay 2 for controlling on / off is fixed on the BMS 10, the shunt 19 is responsible for collecting current, and the series connection copper row 5 is fixed to connect the overcurrent interface of the BMS 10 and the overcurrent interface of the module. The communication wire harness 13 transfers the information collected by the BMS 10 to the communication interface 14 of the battery upper cover.

[0050] In some embodiments of the present application, the battery cell module 4 includes a plurality of soft-pack battery cells, and the plurality of soft-pack battery cells are connected in series and stacked, and an elastic member is arranged between adjacent two soft-pack battery cells.

[0051] In this embodiment, the grouping method of the battery cell module 4 includes separating 4 battery cells by an elastic material. The battery cell tabs pass through the carrier and are connected in series by laser welding, and the battery cell module 4 is placed in the battery box 16.

[0052] The module positive copper busbar 6 of the battery cell module 4 is connected to the series copper busbar 5. The series copper busbar 5 is connected to the relay 2. The relay 2 is connected to the second connection copper busbar 7. The second connection copper busbar 7 is then connected to the positive pole column 9 through the positive output copper busbar 8, so that the battery cell module 4 is electrically connected to the positive pole column 9.

[0053] In some embodiments of the present application, it further includes a flexible circuit acquisition board 11, and the flexible circuit acquisition board 11 is located on the side of the battery cell module 4 and is connected to the battery cell module 4.

[0054] In this embodiment, the flexible circuit board integrates a nickel sheet for collecting voltage, current, and temperature information. It is connected to the battery cell module 4 by laser welding, and the BMS 10 can monitor the voltage and temperature of the battery cells and transmit the information to the whole vehicle in real time.

[0055] In some embodiments of the present application, it further includes a connector 12 and a communication line 13. The connector 12 is located at the edge of the printed circuit board 1, and the communication line 13 is connected to the connector 12.

[0056] In this embodiment, the communication interface 14 integrally formed with the cover 18 by secondary injection molding enables the entire battery system to pass through the communication interface 14 and realize the LIN communication function with the whole vehicle through the pins of the connector 12.

[0057] Figure 3 The battery cell module 4 includes: a soft-pack battery cell that provides electrical energy for the battery system, a foam 20 that absorbs the assembly error of the battery cell module 4 and the expansion during the use of the battery cells, a carrier that bears and connects the battery cell tabs, bears the flexible circuit acquisition board 11, and the metal pressing plate 17 presses the battery cell module 4 tightly in the battery box 16 through fasteners. The flexible circuit acquisition board 11 is used to monitor the state of the battery cells after the battery cell tabs are welded and transmit the information to the BMS 10 in real time.

[0058] Second, the present application also provides an auxiliary battery system, as Figures 4-5 shown, Figure 4 is a schematic structural diagram of an auxiliary battery system provided by an embodiment of the present application; Figure 5 is an exploded view of an auxiliary battery system provided by an embodiment of the present application.

[0059] An auxiliary battery system includes a housing and an auxiliary battery electrical module as described in any one of the embodiments in the first aspect. The housing has a hollow cavity, and the auxiliary battery electrical module is placed in the cavity.

[0060] In some embodiments of the present application, the housing includes a box body 16 and a pressing plate 17. The battery cell module 4 in the auxiliary battery electrical module is placed in the box body 16, and the pressing plate 17 is pressed on the battery cell module 4.

[0061] In some embodiments of the present application, the housing includes a cover body 18. The printed circuit board 1, the first connection copper bar 3, and the series connection copper bar 5 in the auxiliary battery electrical module are fixedly installed on the cover body 18.

[0062] In this embodiment, the metal pressing plate 17 has the characteristics of high strength and high hardness. After the battery cell module 4 is placed in the box, the pressing plate 17 is connected to the battery box body 16 through fasteners, and the battery cell module 4 is clamped and fixed in the box body 16.

[0063] Figure 4 Externally, the system includes: positive and negative output terminals for electrical connection with the whole vehicle, and there are a positive pole column 9, a negative pole column structure and a polarity mark. The communication interface 14 is used for communication between the battery system and the whole vehicle. The pressure relief and exhaust device 15 is used for battery pack safety management. The battery box body 16 with mounting feet is used for fixing with the whole vehicle.

[0064] Figure 5 It mainly shows the composition of the internal components of the battery system, including: the battery cell module 4 for providing electric energy, the battery cover body 18 and the electrical module for battery system connection, battery state monitoring and communication with the whole vehicle. The battery box body 16 is used for carrying the battery cell module 4 and the battery upper cover, and is fixed with the whole vehicle.

[0065] The mechanical connection between the electronic and electrical components and the cover body 18, the electrical connection between the module system and the cover body 18 electrical system, the connection between the flexible circuit acquisition board 11 (FPCB) and the battery management system 10 (BMS10), and the connection between the battery cover body 18 and the battery box body 16 make the module system and the battery housing an integral whole, and have the capabilities of anti-impact, anti-vibration, waterproof and dustproof.

[0066] For the complete electrical connection system, the battery cell tabs pass through the carrier and are connected in series and parallel by laser welding to form a module system, and the electric energy is output through the hot-melt copper bar on the carrier; the positive and negative output poles of the battery system are respectively connected to the battery management system 10 (BMS10) and the series connection copper bar 5 through the insert copper bar on the upper cover to form the cover body 18 system; the cover body 18 system and the module system are locked through fasteners to realize the battery circuit connection and have the ability to withstand large current overcurrent, and have the functions of monitoring the battery state and communicating with the whole vehicle.

[0067] The battery pack has a safety management system, and the battery box body 16 has a pressure relief device (waterproof and breathable). During daily use, the pressure inside and outside the battery can be balanced through the pressure relief device, and at the same time, it has the ability to prevent dust and water; when the battery cell undergoes a short circuit or other abnormalities leading to thermal runaway, a large amount of gas can be discharged through the pressure relief device to prevent the internal pressure of the battery system from becoming too large and causing an explosion, ensuring the safety of the whole vehicle and users.

[0068] Compared with the prior art, the beneficial technical effects brought by the technical solution provided in this application include: In the embodiment of this application, by designing the series copper bar 5, the series copper bar 5 bridges the first connection copper bar 3 and the battery cell module 4. Compared with the direct connection between the first connection copper bar 3 and the battery cell module 4, the length of the first connection copper bar 3 is reduced, the position of the overcurrent interface of the relay 2 is changed, and the distance between the first connection copper bar 3 and the connector 12 becomes larger. This can not only reduce the interference with the communication between the battery management system 10 assembly and the whole vehicle during overcurrent, but also reduce the impact on the durability of the connector 12 during heating, and can also reduce the stress on the printed circuit board 1 during welding with the printed circuit board 1, reducing the risk of component detachment caused by the bending deformation of the printed circuit board 1; and the copper bar body 52 of the series copper bar 5 is arranged in a staggered layer with a spacing from the printed circuit board 1, so the series copper bar 5 has less interference with communication and less impact on the connector 12, and will not apply stress to the printed circuit board 1, improving the product quality of the battery.

[0069] Those skilled in the art of this technology can understand that the steps, measures, and solutions in various operations, methods, and processes discussed in this application can be alternated, changed, rearranged, decomposed, combined, or deleted.

[0070] The specific implementation manners of the present application described above do not constitute a limitation on the protection scope of the present application. Any other corresponding changes and deformations made according to the technical concept of the present application should be included in the protection scope of the claims of the present application.

Claims

1. An auxiliary battery electrical module, characterized in that: include: Printed circuit boards; a relay, the relay being mounted on the printed circuit board; a first connecting copper bar connected to the relay; A battery cell module, wherein the battery cell module is located on a side of the printed circuit board facing away from the printed circuit board; as well as A series copper busbar comprises a first pin, a copper busbar body and a second pin connected in sequence, the copper busbar body and the first pin and the second pin are arranged in staggered layers, the first pin is connected to the first connecting copper busbar, and the second pin is connected to the battery module.

2. The auxiliary battery electrical module according to claim 1, characterized in that: It also includes a module positive copper bar, which includes two bent parts that are perpendicular to each other, and the two bent parts are respectively connected to the battery cell module and the series copper bar.

3. The auxiliary battery electrical module according to claim 2, characterized in that: The first pin is in contact with the surface of the first connecting copper bar facing away from the printed circuit board, the second pin is in contact with the surface of the module positive copper bar facing away from the printed circuit board, and the copper bar body is spaced apart from the printed circuit board.

4. The auxiliary battery electrical module according to claim 1, characterized in that: It also includes a second connecting copper bar, a positive output copper bar and a positive pole, wherein the second connecting copper bar is connected to the relay, the positive output copper bar is connected to the second connecting copper bar, and the positive pole is connected to the positive output copper bar.

5. The auxiliary battery electrical module according to claim 1, characterized in that: The battery cell module comprises a plurality of soft-pack battery cells, the plurality of soft-pack battery cells are stacked in series, and an elastic member is arranged between two adjacent soft-pack battery cells.

6. The auxiliary battery electrical module according to claim 1, characterized in that: It also includes a flexible circuit acquisition board, which is located on the side of the battery module and connected to the battery module.

7. The auxiliary battery electrical module according to claim 1, characterized in that: It also includes a connector and a communication line. The connector is located at the edge of the printed circuit board, and the communication line is connected to the connector.

8. An auxiliary battery system, characterized in that: It comprises a shell and the auxiliary battery electrical module as described in any one of claims 1 to 7, wherein the shell has a hollow cavity, and the auxiliary battery electrical module is placed in the cavity.

9. The auxiliary battery system according to claim 8, characterized in that: The shell includes a box body and a pressure plate. The battery module in the auxiliary battery electrical module is placed in the box body, and the pressure plate is pressed on the battery module.

10. The auxiliary battery system according to claim 8, characterized in that: The shell comprises a cover body, and the printed circuit board, the first connecting copper bar, and the series copper bar in the auxiliary battery electrical module are fixedly mounted on the cover body.

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