Integrated busbar and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses an integrated busbar and a battery pack. The integrated busbar comprises a voltage acquisition part used for acquiring the voltage of a battery cell; the plurality of busbars are used for connecting pole columns of the battery cells and are positioned on two opposite sides of the voltage acquisition piece in the width direction; and the plurality of connecting pieces are arranged in one-to-one correspondence with the busbars and are connected with the corresponding busbars and the voltage acquisition pieces, the connecting pieces comprise first connecting pieces and second connecting pieces in interference fit with the first connecting pieces, one of the first connecting pieces and the second connecting pieces is electrically connected with the busbars, and the other one of the first connecting pieces and the second connecting pieces is electrically connected with the voltage acquisition pieces. Compared with a welding mode, the first connecting piece and the second connecting piece are connected in an interference fit mode, the first connecting piece and the second connecting piece are convenient to disassemble subsequently, meanwhile, structural damage to the first connecting piece and the second connecting piece can be reduced, and it is ensured that the first connecting piece and the second connecting piece can be repeatedly used.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to an integrated busbar and battery pack. Background Technology

[0002] To ensure the normal operation of the battery pack, an integrated busbar (CCS, Cells Contact System) is usually used to collect the real-time voltage of each cell in the battery pack. This helps the battery management system to determine the state of charge and health status of each cell, and avoid overcharging or over-discharging problems in individual cells.

[0003] The integrated busbar consists of a busbar, a voltage acquisition unit, and metal components welded to both. When the voltage acquisition unit fails, the metal components and the voltage acquisition unit must be separated before a new voltage acquisition unit can be replaced. However, because residual solder marks remain on the metal components, re-welding them to the new voltage acquisition unit can easily result in burn-through or incomplete soldering. For these reasons, currently, the entire integrated busbar is replaced when a voltage acquisition unit fails. However, replacing the entire busbar not only increases replacement costs but also prolongs maintenance time. Utility Model Content

[0004] In view of this, the present invention provides an integrated busbar and battery pack to solve the problems of high replacement cost and long replacement time of the integrated busbar in the existing battery pack.

[0005] In a first aspect, this utility model provides an integrated busbar, comprising:

[0006] Voltage acquisition device, used to acquire the voltage of the battery cell;

[0007] Multiple busbars are used to connect the terminals of the battery cells and are located on opposite sides of the voltage acquisition device in the width direction;

[0008] Multiple connectors are provided and connected to the busbars and voltage acquisition devices in a one-to-one correspondence. Each connector includes a first connector and a second connector that is interference-fitted with the first connector. One of the first connector and the second connector is electrically connected to the busbar, and the other is electrically connected to the voltage acquisition device.

[0009] Beneficial Effects: Compared to welding, this invention uses an interference fit to connect the first and second connectors. This not only facilitates subsequent disassembly of the first and second connectors but also reduces structural damage to them, ensuring their reusability. Therefore, when the integrated busbar of the battery pack malfunctions, only the first and second connectors need to be disassembled, the faulty voltage acquisition element removed, and then a new voltage acquisition element reconnected to the busbar using the first and second connectors. It is evident that compared to replacing the entire integrated busbar, this application only requires replacing a portion of the integrated busbar structure to restore cell voltage acquisition, reducing maintenance costs associated with repairing the integrated busbar. Furthermore, compared to welding, the interference fit is simpler and more convenient during both installation and disassembly, effectively saving time and labor costs.

[0010] In one alternative embodiment, the ends of the first connector and the second connector that are far apart from each other are welded to the bus or the voltage acquisition device; or, the ends of the first connector and the second connector that are far apart from each other are bonded to the bus or the voltage acquisition device by conductive adhesive; the ends of the first connector and the second connector that are close to each other are inserted into each other.

[0011] Beneficial effects: The ends of the first and second connectors, which are furthest from each other, are connected to the busbar or voltage acquisition unit by welding or conductive adhesive bonding, respectively. Welding ensures high stability and good conductivity of the connection, while conductive adhesive bonding reduces the difficulty of connection operation while ensuring electrical continuity. The ends of the first and second connectors, which are close to each other, are connected by a plug-in method, facilitating rapid assembly and disassembly of the first and second connectors, improving the assembly efficiency and maintainability of the integrated busbar. This helps reduce maintenance costs and improve the overall production and operational efficiency of the battery pack.

[0012] In one optional embodiment, the ends of the first connector and the second connector that are far apart from each other are located on the upper surfaces of the busbar and the voltage acquisition device, respectively, and the side of the first connector and the second connector that are far apart from each other and connected to the busbar or the voltage acquisition device is a plane.

[0013] Beneficial effects: Placing the ends of the first and second connectors, which are far apart from each other, on the upper surfaces of the busbar and voltage acquisition unit, respectively, not only facilitates initial installation but also makes subsequent inspection and maintenance easier. Furthermore, making the side of the first and second connectors that connects to the busbar or voltage acquisition unit a plane significantly increases the contact area, resulting in a more stable and reliable connection.

[0014] In one alternative embodiment, one of the first connector and the second connector is provided with an opening, and the other is provided with a plug-in portion that engages with the opening.

[0015] Beneficial effects: The combination of the opening and the plug facilitates disassembly and maintenance in the later stage. When it is necessary to inspect and replace the integrated busbar, the first connector and the second connector can be easily separated without causing serious damage to the connector itself, thereby reducing the difficulty and cost of maintenance.

[0016] In one alternative embodiment, the opening direction is consistent with the length or width direction of the voltage acquisition element.

[0017] Beneficial effects: Compared to aligning the opening direction with the thickness direction of the voltage acquisition component, aligning the opening direction with the length or width direction of the voltage acquisition component reduces the space occupied in the height direction within the battery pack. This allows for more space to be reserved for other important components within the battery pack, thereby contributing to improved energy density and overall performance of the battery pack.

[0018] In one alternative embodiment, one of the first connector and the second connector is a spring-loaded terminal, and the other is a insert terminal that is inserted and mated with the spring-loaded terminal.

[0019] Beneficial effects: The end connecting the spring-loaded terminal and the insert terminal is elastic, which firmly clamps the insert terminal, preventing loosening due to vibration, impact, or other external factors. Furthermore, the insertion and connection method of the spring-loaded terminal and the insert terminal allows operators to easily divide the integrated busbar into multiple parts. Thus, in case of a fault, only the faulty part needs to be replaced, without replacing the entire integrated busbar.

[0020] In one alternative embodiment, the upper surface of the bus is flush with the upper surface of the voltage acquisition device, and the connector is located on the upper surfaces of the bus and the voltage acquisition device.

[0021] Beneficial effects: The upper surface of the busbar is flush with the upper surface of the voltage acquisition unit, and the connector is placed on the upper surfaces of both. This layout not only simplifies the connection process between the connector and the busbar and voltage acquisition unit, but also facilitates the precise positioning and insertion of the first and second connectors, improving the convenience and accuracy of the assembly process.

[0022] In one alternative embodiment, a plurality of the busbars are located on opposite sides of the voltage acquisition element in the width direction and are symmetrically arranged about the length direction of the voltage acquisition element.

[0023] Beneficial effects: On the one hand, the symmetrical layout can optimize the current distribution path, making the current transmission between the voltage acquisition device and the bus more balanced and stable; on the other hand, the symmetrically distributed bus can make the voltage acquisition device be subjected to uniform force on both sides, improving the structural reliability and durability of the voltage acquisition device.

[0024] In one alternative implementation, the voltage acquisition device is a flexible printed circuit board or a flexible die-cut circuit board.

[0025] Beneficial effects: Both flexible printed circuit boards and flexible die-cut circuit boards have the ability to accurately collect cell voltage, and can effectively feed back the real-time status information of the cells to the battery management system, thereby providing reliable data support for the accurate operation of the battery management system and ensuring its accurate monitoring of battery status.

[0026] Secondly, this utility model also provides a battery pack, comprising:

[0027] A battery module includes multiple battery cells arranged side by side along its thickness direction, and the upper surface of each battery cell is provided with an electrode post.

[0028] The aforementioned integrated busbar has multiple busbars spaced apart along the thickness direction of the battery cell and connecting the terminals between two adjacent battery cells; the voltage acquisition device is disposed on the top of the battery module, and the connector is located on the upper surface of the busbar and the voltage acquisition device.

[0029] Beneficial effects: By adopting the aforementioned integrated busbar, the battery pack of this utility model can not only effectively reduce the cost of subsequent maintenance of the integrated busbar, but also shorten the time consumed in the maintenance process. Furthermore, the battery pack of this utility model possesses all the advantages of the aforementioned integrated busbar, which will not be elaborated further here. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of an integrated busbar according to an embodiment of the present utility model;

[0032] Figure 2 This is a schematic diagram of the structure of a spring-loaded terminal according to an embodiment of the present utility model;

[0033] Figure 3This is a schematic diagram of the structure of a plug-in terminal according to an embodiment of the present utility model;

[0034] Figure 4 This is a schematic diagram of the assembly of the spring terminal and the insert terminal according to an embodiment of the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Voltage acquisition unit; 2. Busbar; 3. Connector; 301. First connector; 3011. Opening; 3012. Spring-loaded terminal; 302. Second connector; 3021. Insertion part; 3022. Inserted terminal; 4. Battery module; 401. Top. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0038] To address the issues of high replacement costs and long replacement times associated with the integrated busbars in existing battery packs, this invention provides an integrated busbar and battery pack.

[0039] The following is combined Figures 1 to 3 The following describes embodiments of the present invention.

[0040] According to embodiments of the present invention, on the one hand, such as Figure 1 As shown, an integrated busbar is provided, including: a voltage acquisition device 1, multiple busbars 2 and multiple connectors 3.

[0041] Specifically, the voltage acquisition unit 1 is used to acquire the voltage of the battery cell; multiple busbars 2 are used to connect the terminals of the battery cell and are located on opposite sides of the width direction of the voltage acquisition unit 1; multiple connectors 3 are configured one-to-one with the busbars 2 and connected to the corresponding busbars 2 and the voltage acquisition unit 1. The connectors 3 include a first connector 301 and a second connector 302 that is interference-fitted with the first connector 301. One of the first connector 301 and the second connector 302 is electrically connected to the busbar 2, and the other is electrically connected to the voltage acquisition unit 1.

[0042] Compared to welding, this embodiment uses an interference fit to connect the first connector 301 and the second connector 302. This not only facilitates subsequent disassembly of the first connector 301 and the second connector 302, but also reduces structural damage to the first connector 301 and the second connector 302, ensuring that the first connector 301 and the second connector 302 can be reused. Therefore, when the integrated busbar of the battery pack fails, it is only necessary to disassemble the first connector 301 and the second connector 302, remove the faulty voltage acquisition element 1, and then reconnect the new voltage acquisition element 1 to the busbar 2 using the first connector 301 and the second connector 302. It is evident that compared to replacing the entire integrated busbar, this application only needs to replace a portion of the integrated busbar structure to restore the acquisition of cell voltage, reducing maintenance costs associated with repairing the integrated busbar. Furthermore, compared to welding, the interference fit is simpler and more convenient during both installation and disassembly, thus effectively saving time and labor costs.

[0043] It should be noted that a battery pack typically contains multiple cells arranged side-by-side. To connect these cells in series or parallel, busbars 2 are used to connect the terminals between adjacent cells. Generally, adjacent terminals on different cells are connected by only one busbar 2, so adjacent cells are usually connected in series or parallel via two busbars 2. Furthermore, to collect the cell voltage, a closed loop needs to be formed between the cell being collected and the voltage acquisition device 1. Therefore, each busbar 2 needs to be connected to the voltage acquisition device 1 via a corresponding connector 3. Understandably, to ensure smooth current flow, the connector 3 is made of metal. For example, the connector 3 is made of nickel.

[0044] According to one embodiment of this utility model, the ends of the first connector 301 and the second connector 302 that are far apart from each other are welded to the busbar 2 or the voltage acquisition device 1, or the ends of the first connector 301 and the second connector 302 that are far apart from each other are bonded to the busbar 2 or the voltage acquisition device 1 with conductive adhesive; the ends of the first connector 301 and the second connector 302 that are close to each other are plugged in. The connection methods of welding or conductive adhesive bonding between the ends of the first connector 301 and the second connector 302 that are far apart from each other and the busbar 2 or the voltage acquisition device 1, respectively, ensure high stability and good conductivity of the connection, while conductive adhesive bonding reduces the difficulty of connection operation while ensuring electrical conductivity. The plugging method between the ends of the first connector 301 and the second connector 302 that are close to each other facilitates rapid assembly and disassembly of the first connector 301 and the second connector 302, improving the assembly efficiency and maintainability of the integrated busbar. This helps to reduce maintenance costs and improve the overall production and operating efficiency of the battery pack.

[0045] Understandably, when the integrated busbar malfunctions, if one of the first connector 301 and the second connector 302 is welded to the voltage acquisition component 1, then the voltage acquisition component 1 and the first connector 301 or the second connector 302 welded to the voltage acquisition component 1 need to be replaced. This is to avoid the second welding of the first connector 301 or the second connector 302 to the voltage acquisition component 1 resulting in burn-through or incomplete welding, which would affect the voltage acquisition accuracy of the voltage acquisition component 1. If one of the first connector 301 and the second connector 302 is bonded to the voltage acquisition component 1 with conductive adhesive, then the first connector 301 or the second connector 302 can be reused, and only the voltage acquisition component 1 needs to be replaced.

[0046] According to one embodiment of the present invention, such as Figures 2 to 4 As shown, the ends of the first connector 301 and the second connector 302 that are far apart from each other are located on the upper surfaces of the busbar 2 and the voltage acquisition unit 1, respectively, and the side of the first connector 301 and the second connector 302 that is far apart from each other and connects to the busbar 2 or the voltage acquisition unit 1 is a plane. It can be understood that placing the ends of the first connector 301 and the second connector 302 that are far apart from each other on the upper surfaces of the busbar 2 and the voltage acquisition unit 1 not only facilitates initial installation but also makes subsequent inspection and maintenance easier. Furthermore, making the side of the first connector 301 and the second connector 302 that is far apart from each other and connects to the busbar 2 or the voltage acquisition unit 1 a plane significantly increases the contact area, making the connection more stable and reliable.

[0047] According to one embodiment of the present invention, such as Figures 2 to 4 As shown, one of the first connector 301 and the second connector 302 has an opening 3011, and the other has a plug-in portion 3021 that engages with the opening 3011. The combination of the opening 3011 and the plug-in portion 3021 facilitates disassembly and maintenance in the future. When it is necessary to inspect and replace the integrated busbar, the first connector 301 and the second connector 302 can be easily separated without causing serious damage to the connector itself, thereby reducing the difficulty and cost of maintenance.

[0048] According to one embodiment of the present invention, such as Figure 1 As shown, the opening direction of the opening 3011 is consistent with the length or width direction of the voltage acquisition component 1. Compared to the opening direction of the opening 3011 being consistent with the thickness direction of the voltage acquisition component 1, aligning the opening direction of the opening 3011 with the length or width direction of the voltage acquisition component 1 reduces the space occupied in the height direction within the battery pack. This allows for more space to be reserved for other important components within the battery pack, thereby contributing to improved energy density and overall performance of the battery pack.

[0049] It should be noted that, in order to make reasonable use of the internal space of the battery pack and optimize the internal layout, the voltage acquisition device 1 in this embodiment is horizontally positioned on top of the battery cell and located between the positive and negative terminals of the cell. Therefore, in this embodiment, the thickness direction of the voltage acquisition device 1 is consistent with the height direction of the battery pack. Furthermore, in this embodiment, the length and width directions of the voltage acquisition device 1 are consistent with... Figure 1 The directions shown in the diagram are consistent.

[0050] According to one embodiment of the present invention, such as Figures 2 to 4 As shown, one of the first connector 301 and the second connector 302 is a spring-loaded terminal 3012, and the other is a insert terminal 3022 that engages with the spring-loaded terminal 3012. The end of the spring-loaded terminal 3012 connected to the insert terminal 3022 is elastic, which firmly clamps the insert terminal 3022, preventing loosening due to vibration, impact, or other external factors. Furthermore, the engagement method of the spring-loaded terminal 3012 and the insert terminal 3022 allows operators to easily divide the integrated busbar into multiple parts. Thus, in case of a fault, only the faulty part needs to be replaced, without replacing the entire integrated busbar.

[0051] According to one embodiment of the present invention, such as Figure 1 As shown, the upper surface of bus 2 is flush with the upper surface of voltage acquisition component 1, and connector 3 is located on the upper surfaces of both bus 2 and voltage acquisition component 1. This arrangement simplifies the connection process between connector 3 and bus 2 and voltage acquisition component 1, and facilitates precise positioning and insertion of the first connector 301 and the second connector 302, improving the convenience and accuracy of the assembly process.

[0052] According to one embodiment of the present invention, such as Figure 1 As shown, multiple busbars 2 are located on opposite sides of the voltage acquisition element 1 in the width direction and are symmetrically arranged about the length direction of the voltage acquisition element 1. On the one hand, the symmetrical layout can optimize the current distribution path, making the current transmission between the voltage acquisition element 1 and the busbars 2 more balanced and stable; on the other hand, the symmetrically distributed busbars 2 can make the forces on both sides of the voltage acquisition element 1 uniform, improving the structural reliability and durability of the voltage acquisition element 1.

[0053] According to one embodiment of this utility model, the voltage acquisition component 1 is a flexible printed circuit board or a flexible die-cut circuit board. Both the flexible printed circuit board and the flexible die-cut circuit board have the ability to accurately acquire the cell voltage, and can effectively feed back the real-time status information of the cell to the battery management system, thereby providing reliable data support for the accurate operation of the battery management system and ensuring its accurate monitoring of the battery status.

[0054] According to an embodiment of the present invention, another aspect provides a battery pack, including: a battery module 4 and the aforementioned integrated busbar.

[0055] Specifically, the battery module 4 includes multiple battery cells arranged side by side along its thickness direction, and the upper surface of the battery cells is provided with terminals; multiple busbars 2 are arranged at intervals along the thickness direction of the battery cells and connect the terminals between adjacent battery cells; voltage acquisition device 1 is disposed on the top 401 of the battery module 4, and connector 3 is located on the upper surface of the busbars 2 and voltage acquisition device 1.

[0056] It should be noted that in this embodiment, the thickness direction of the battery cell is parallel to... Figure 1 The length directions shown are consistent.

[0057] The battery pack of this embodiment, by employing the aforementioned integrated busbar, not only effectively reduces the cost of subsequent maintenance of the integrated busbar, but also shortens the time consumed during the maintenance process. Furthermore, the battery pack of this invention possesses all the advantages of the aforementioned integrated busbar, which will not be elaborated further here.

[0058] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An integrated busbar, characterized in that, include: Voltage acquisition device, used to acquire the voltage of the battery cell; Multiple busbars are used to connect the terminals of the battery cells and are located on opposite sides of the voltage acquisition device in the width direction; Multiple connectors are provided and connected to the busbars and voltage acquisition devices in a one-to-one correspondence. Each connector includes a first connector and a second connector that is interference-fitted with the first connector. One of the first connector and the second connector is electrically connected to the busbar, and the other is electrically connected to the voltage acquisition device.

2. The integrated busbar according to claim 1, characterized in that, The ends of the first connector and the second connector that are far apart from each other are welded to the busbar or the voltage acquisition device, or the ends of the first connector and the second connector that are far apart from each other are bonded to the busbar or the voltage acquisition device with conductive adhesive; the ends of the first connector and the second connector that are close to each other are inserted into each other.

3. The integrated busbar according to claim 2, characterized in that, The ends of the first connector and the second connector that are far apart from each other are located on the upper surfaces of the busbar and the voltage acquisition device, respectively, and the side of the first connector and the second connector that are far apart from each other and connected to the busbar or the voltage acquisition device is a plane.

4. The integrated busbar according to claim 2, characterized in that, One of the first connector and the second connector is provided with an opening, and the other is provided with a plug-in portion that engages with the opening.

5. The integrated busbar according to claim 4, characterized in that, The opening direction is consistent with the length or width direction of the voltage acquisition device.

6. The integrated busbar according to claim 4, characterized in that, One of the first connector and the second connector is a spring-loaded terminal, and the other is a insert terminal that is inserted and mated with the spring-loaded terminal.

7. The integrated busbar according to any one of claims 1 to 6, characterized in that, The upper surface of the busbar is flush with the upper surface of the voltage acquisition device, and the connector is located on the upper surfaces of the busbar and the voltage acquisition device.

8. The integrated busbar according to any one of claims 1 to 6, characterized in that, Multiple busbars are located on opposite sides of the voltage acquisition element in the width direction and are symmetrically arranged about the length direction of the voltage acquisition element.

9. The integrated busbar according to any one of claims 1 to 6, characterized in that, The voltage acquisition device is a flexible printed circuit board or a flexible die-cut circuit board.

10. A battery pack, characterized in that, include: A battery module includes multiple battery cells arranged side by side along its thickness direction, and the upper surface of each battery cell is provided with an electrode post. According to any one of claims 1 to 9, the integrated busbar is provided with a plurality of busbars spaced apart along the thickness direction of the battery cell and connecting the terminals between two adjacent battery cells; the voltage acquisition device is disposed on the top of the battery module and the connector is located on the upper surface of the busbar and the voltage acquisition device.

Images