Battery pack and integrated connecting bar thereof

Abstract

The utility model provides a battery pack and an integrated connection bar thereof. The integrated connection bar comprises a connection bar and a signal collector. The signal collector comprises a temperature sensor and a voltage collection wire, the temperature sensor is welded and fixed on the surface of the connecting bar, the voltage collection wire is welded and fixed on the surface of the connecting bar, and a transparent adhesive layer covers the joint of the voltage collection wire and the connecting bar. The temperature sensor and the voltage acquisition wire in the signal collector are welded and fixed on the connecting bar, so that compared with a mode of fixing through heat-conducting glue, the temperature sensor and the connecting bar as well as the voltage acquisition wire and the connecting bar can be ensured to maintain relatively large connection retention force; the connection stability and reliability are improved to a great extent, so that the reliability of signal acquisition is ensured, the connection operation of the temperature sensor and the connection bar and the connection operation of the voltage acquisition lead and the connection bar can be completed at the same station by adopting the same process, and the production efficiency and the product consistency are both improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery pack and its integrated connection strip. Background Technology

[0002] For a battery pack, multiple cells are electrically connected together via an integrated connector to facilitate control of current input and output. The integrated connector includes the connector itself and a signal acquisition unit (SMU). The SMU connects to the connector to collect information such as temperature and voltage. However, the SMU is typically fixed to the connector with heat-reactive adhesive. Over time, the adhesive's holding power weakens, causing the SMU to easily detach from the connector, thus reducing the reliability of signal acquisition. Utility Model Content

[0003] The purpose of this application is to provide an integrated connection bar that can ensure the reliability of signal acquisition. Furthermore, a battery pack having this integrated connection bar is provided.

[0004] In a first aspect, embodiments of this application provide an integrated connection bus, comprising:

[0005] An integrated connection strip, comprising:

[0006] Connecting busbars are used for electrical connection with battery cells; and

[0007] The signal acquisition device includes a temperature sensor and a voltage acquisition wire. The temperature sensor is welded and fixed to the surface of the connecting bar, and the voltage acquisition wire is welded and fixed to the surface of the connecting bar. The connection between the voltage acquisition wire and the connecting bar is covered with a transparent adhesive layer.

[0008] The beneficial effects of the integrated connector provided in this application are as follows: By welding the temperature sensor and voltage acquisition wire in the signal acquisition unit to the connector, compared with fixing with thermally conductive adhesive, a greater connection holding force can be maintained between the temperature sensor and the connector, and between the voltage acquisition wire and the connector, thus greatly improving the stability and reliability of the connection. This ensures the reliability of signal acquisition and also improves the reliability of the integrated connector during installation, transportation, and use. Furthermore, since the temperature sensor and voltage acquisition wire are both welded to the connector, the same process can be used in the manufacturing process to complete the connection operations of the temperature sensor and the connector, and the voltage acquisition wire and the connector, at the same workstation, thereby improving production efficiency and product consistency. Moreover, by covering the connection between the voltage acquisition wire and the connector with a transparent adhesive layer, the welding quality can be visually inspected through the transparent adhesive layer, and the connection strength between the voltage acquisition wire and the connector can be further strengthened, improving connection reliability.

[0009] In one embodiment, the temperature sensor includes a transmission line, a heat conductor, and a sensor. The heat conductor is welded and fixed to the connecting bar. The heat conductor has a receiving cavity. The sensor is installed in the receiving cavity. The transmission line is fixedly connected to the heat conductor and electrically connected to the sensor.

[0010] In one embodiment, the sensor and the transmission line are fixedly connected to the heat conductor by a cured colloid filled in the receiving cavity.

[0011] In one embodiment, the heat conductor includes a welding part and a mounting part integrally connected to the welding part, the receiving cavity is formed in the mounting part, and the welding part is a metal sheet tightly attached to the connecting bar.

[0012] In one embodiment, the welded part is an aluminum sheet, the connecting bar is an aluminum bar, and the welded part is ultrasonically welded to the connecting bar.

[0013] In one embodiment, the welding area between the welded part and the connecting bar is 30 mm. 2 ~100mm 2 .

[0014] In one embodiment, the thermal conductivity of the heat conductor is greater than 50 W / (m·K).

[0015] In one embodiment, the transparent adhesive layer is a shadowless adhesive layer.

[0016] In one embodiment, there are multiple connection bars and multiple signal collectors, with each connection bar connected to a corresponding signal collector.

[0017] Secondly, embodiments of this application provide a battery pack, including battery cells and the aforementioned integrated connection bar, wherein there are multiple battery cells and the integrated connection bar electrically connects the multiple battery cells together.

[0018] The beneficial effects of the battery pack provided in this application embodiment are as follows: due to the good structural stability and reliability of the above-mentioned integrated connection bar, the entire battery pack can have stable and reliable working performance after multiple cells are electrically connected together. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A three-dimensional structural diagram of the integrated connecting strip provided in the embodiments of this application;

[0021] Figure 2 for Figure 1 An enlarged schematic diagram of the structure at point A in the integrated connection row shown;

[0022] The following are the labeling elements in the figure:

[0023] 100. Integrated connector; 200. Connector; 300. Signal acquisition unit; 310. Temperature sensor; 311. Transmission line; 312. Heat conductor; 313. Welding part; 314. Mounting part; 320. Voltage acquisition wire; 321. Transparent adhesive layer; 400. Wire harness. Detailed Implementation

[0024] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0025] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0026] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0028] Please refer to the following: Figure 1 and Figure 2The battery pack provided in the embodiments of this application will now be described. The battery pack includes battery cells (not shown) and an integrated connection bar 100. There are multiple battery cells, and the integrated connection bar 100 electrically connects the multiple battery cells together. The multiple battery cells can have their current input and output simultaneously through the integrated connection bar 100.

[0029] The integrated connector 100 includes a connector 200 and a signal acquisition unit 300. The connector 200 is used for electrical connection with the battery cell. The signal acquisition unit 300 includes a temperature sensor 310 and a voltage acquisition wire 320. The temperature sensor 310 is soldered and fixed to the surface of the connector 200, and the voltage acquisition wire 320 is soldered and fixed to the surface of the connector 200. The connection between the voltage acquisition wire 320 and the connector 200 is covered with a transparent adhesive layer 321.

[0030] There are multiple connection bars 200. Multiple battery cells are arranged in an array, and any two adjacent battery cells are electrically connected through a connection bar 200. Thus, multiple connection bars 200 work together to electrically connect multiple battery cells together.

[0031] There are multiple signal acquisition units 300, and each of these multiple signal acquisition units 300 is configured to correspond one-to-one with a number of connection bars 200. It can be understood that the number of signal acquisition units 300 can be the same as the number of connection bars 200, so that each connection bar 200 is connected to a signal acquisition unit 300. Alternatively, the number of connection bars 200 can be greater than the number of signal acquisition units 300, so that multiple signal acquisition units 300 are connected one-to-one with a portion of the connection bars 200, while some connection bars 200 are not equipped with signal acquisition units 300. Furthermore, the temperature sensor 310 and the voltage acquisition wire 320 in the signal acquisition unit 300 can be connected to the same connection bar 200 or to different connection bars 200, allowing a connection bar 200 to be connected only to the temperature sensor 310, only to the voltage acquisition wire 320, or simultaneously to both. The setup of multiple signal acquisition units 300 can collect temperature and voltage signals from multiple connection bars 200 to monitor the temperature and voltage of the connection bars 200 in real time, ensuring the battery pack is in good working condition.

[0032] For the signal acquisition unit 300, its temperature sensor 310 can be connected to the connecting bus 200 to detect the temperature of the connecting bus 200, while the voltage acquisition wire 320 can be connected to the connecting bus 200 to obtain the voltage signal of the connecting bus 200. Specifically, the temperature sensor 310 and the voltage acquisition wire 320 are respectively connected to two spaced-apart positions on the connecting bus 200 to avoid interference between the temperature sensor 310 and the voltage acquisition wire, or they can be connected to different connecting buses 200 as needed for detection.

[0033] Specifically, by welding both the temperature sensor 310 and the voltage acquisition wire 320 to the connector 200, compared to fixing them with thermally conductive adhesive, a greater connection holding force can be maintained between the temperature sensor 310 and the connector 200, and between the voltage acquisition wire 320 and the connector 200. This significantly improves the stability and reliability of the connection, thereby ensuring the reliability of signal acquisition and enhancing the reliability of the integrated connector during installation, transportation, and use. Furthermore, since both the temperature sensor 310 and the voltage acquisition wire 320 are welded to the connector 200, the same process can be used in the manufacturing process to complete the connection operations at the same workstation, improving production efficiency and product consistency. Moreover, by covering the connection between the voltage acquisition wire 320 and the connector 200 with a transparent adhesive layer 321, the welding quality can be visually inspected through the transparent adhesive layer 321, and the connection strength between the voltage acquisition wire 320 and the connector 200 can be further strengthened, improving connection reliability.

[0034] It is understandable that, due to the good structural stability and reliability of the integrated connection bar 100 and the high reliability of temperature and voltage signal acquisition, the entire battery pack can have stable and reliable working performance after multiple cells are electrically connected together using the integrated connection bar 100.

[0035] like Figure 2 As shown, specifically in this application, the temperature sensor 310 includes a transmission line 311, a heat conductor 312, and a sensor (not shown). The heat conductor 312 is welded and fixed to the connecting strip 200. The heat conductor 312 has a receiving cavity, and the sensor is installed inside the receiving cavity. The transmission line 311 is fixedly connected to the heat conductor 312 and electrically connected to the sensor. It can be understood that by welding and fixing the heat conductor 312 to the connecting strip 200, the temperature of the connecting strip 200 is conducted to the heat conductor 312. The sensor, placed inside the receiving cavity of the heat conductor 312, can accurately obtain the temperature of the heat conductor 312 and then output the temperature information via the transmission line 311. Furthermore, since the sensor is housed inside the receiving cavity of the heat conductor 312 and is not exposed, the probability of the sensor being damaged by impacts can be reduced. Further, by fixing the transmission line 311 to the heat conductor 312, the transmission line 311 can prevent the sensor from moving relative to the heat conductor 312, thus avoiding affecting the detection accuracy.

[0036] It is understandable that the transmission lines 311 of multiple temperature sensors 310 and multiple voltage acquisition wires 320 are brought together to form a wire bundle 400, so as to facilitate centralized wiring.

[0037] Specifically, in this application, the sensor and transmission line 311 are fixedly connected to the heat conductor 312 by a curing colloid filled within the receiving cavity. By filling the receiving cavity with the curing colloid, the sensor and the heat conductor 312 can be relatively fixed, preventing the sensor from moving inside the heat conductor 312 and thus reducing the probability of the sensor being damaged by impact. Simultaneously, the curing colloid can seal the opening of the receiving cavity to prevent external moisture, dust, etc., from entering the receiving cavity and affecting the sensor's performance, as the sensor is confined within the receiving cavity and cannot protrude from the opening. Furthermore, the transmission line 311 connected to the sensor is led out through the opening of the receiving cavity. When filling the receiving cavity with the curing colloid, the curing colloid can surround the transmission line 311, relatively fixing the transmission line 311 to the heat conductor 312 and preventing the transmission line 311 from moving relative to the heat conductor 312 at the opening of the receiving cavity. Specifically, the curing colloid can be epoxy resin.

[0038] like Figure 2 As shown, specifically in this application, the heat conductor 312 includes a welding portion 313 and a mounting portion 314 integrally connected to the welding portion 313. A receiving cavity is formed in the mounting portion 314, and the welding portion 313 is a metal sheet tightly attached to the connecting strip 200. It can be understood that because the welding portion 313 and the mounting portion 314 are integrally connected, the heat from the connecting strip 200 can be quickly conducted to the mounting portion 314 via the welding portion 313, and thus sensed by the sensor installed inside the receiving cavity of the mounting portion 314. It can be understood that metal has better thermal conductivity, resulting in more accurate temperature acquisition. Furthermore, the sheet-like welding portion 313 has a larger contact area with the connecting strip 200, enabling it to maintain a better fixed connection force with the connecting strip 200, thus more accurately reflecting the temperature of the connecting strip 200 and helping to improve temperature detection accuracy.

[0039] Specifically, the welding part 313 is a metal sheet in the shape of a teardrop. Because the welding part 313 is teardrop-shaped and has smooth edges without sharp corners, the connection is more reliable and less prone to separation after the welding part 313 is welded to the connecting strip 200.

[0040] Furthermore, the heat conductor 312 can be made of metals with good thermal conductivity, such as aluminum, nickel, or copper, to facilitate a rapid response to temperature changes in the connector 200, thereby improving the temperature detection accuracy of the sensor. Specifically, the thermal conductivity of the heat conductor 312 is greater than 50 W / (m·K). It can be understood that the higher the thermal conductivity of the heat conductor 312, the better its thermal conductivity, which will be more conducive to a rapid response to temperature changes in the connector 200.

[0041] Specifically, in this application, the welding part 313 is an aluminum sheet, and the connecting busbar 200 is an aluminum busbar. The welding part 313 is ultrasonically welded to the connecting busbar 200. By setting both the heat conductor 312 and the connecting busbar 200 to aluminum, and using ultrasonic welding to weld the welding part 313 to the connecting busbar 200, the two materials are the same and have the same physical and chemical properties. This results in a more uniform temperature distribution and weld formation during the welding process, which can improve the stability and success rate of the welding.

[0042] Specifically, in this application, the welding area between the welding part 313 and the connecting strip 200 is 30 mm. 2 ~100mm 2 It is understandable that if the welding area between the welded part 313 and the connecting strip 200 is too large, the sensor will not be able to sense a large area. If the welding area is too small, it will be difficult to achieve a stable connection between the heat conductor 312 and the connecting strip 200. Therefore, the welding area between the welded part 313 and the connecting strip 200 is limited to 30mm. 2 ~100mm 2 This satisfies both the requirements of reliable connection and the sensor's sensing range. Specifically, the welding area can be 30mm². 2 40mm 2 50mm 2 60mm 2 70mm 2 80mm 2 90mm 2 100mm 2 Specifically, the surface of the welding part 313 facing the connecting row 200 is in close contact with the connecting row 200 and is completely welded to the connecting row 200.

[0043] Specifically, in this application, the transparent adhesive layer 321 is a shadowless adhesive layer, also known as UV adhesive. After applying UV adhesive to the welding position between the voltage acquisition wire 320 and the connecting pin 200, the UV adhesive can be cured by irradiation with ultraviolet light for about 10 seconds. It is understandable that if a thermally reactive adhesive is used for curing through a chemical reaction, the curing time would be approximately 2 hours. This application uses UV adhesive, which can significantly shorten the curing time and improve production efficiency. Furthermore, the UV adhesive is transparent, allowing for convenient visual inspection of the solder joint condition.

[0044] The battery pack provided in this application embodiment includes the above-mentioned integrated connection bar 100. Since the integrated connection bar 100 has good structural stability and reliability, after multiple battery cells are electrically connected together by the integrated connection bar 100, the entire battery pack can have stable and reliable working performance.

[0045] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An integrated connecting strip, characterized in that, include: Connector bar, used for electrical connection with battery cells; and The signal acquisition device includes a temperature sensor and a voltage acquisition wire. The temperature sensor is welded and fixed to the surface of the connecting bar, and the voltage acquisition wire is welded and fixed to the surface of the connecting bar. The connection between the voltage acquisition wire and the connecting bar is covered with a transparent adhesive layer.

2. The integrated connecting strip according to claim 1, characterized in that, The temperature sensor includes a transmission line, a heat conductor, and a sensor. The heat conductor is welded and fixed to the connecting bar. The heat conductor has a receiving cavity. The sensor is installed in the receiving cavity. The transmission line is fixedly connected to the heat conductor and electrically connected to the sensor.

3. The integrated connecting strip according to claim 2, characterized in that, The sensor and the transmission line are fixedly connected to the heat conductor by a cured colloid filled in the cavity.

4. The integrated connecting strip according to claim 2, characterized in that, The heat conductor includes a welding part and a mounting part integrally connected to the welding part. The receiving cavity is opened in the mounting part, and the welding part is a metal sheet tightly attached to the connecting bar.

5. The integrated connecting strip according to claim 4, characterized in that, The welding part is an aluminum sheet, the connecting bar is an aluminum bar, and the welding part is ultrasonically welded to the connecting bar.

6. The integrated connecting strip according to claim 4, characterized in that, The welding area between the welded part and the connecting bar is 30mm. 2 ~100mm 2 .

7. The integrated connecting strip according to any one of claims 2 to 6, characterized in that, The thermal conductivity of the heat conductor is greater than 50 W / (m·K).

8. The integrated connection strip according to claim 1, characterized in that, The transparent adhesive layer is a shadowless adhesive layer.

9. The integrated connecting strip according to claim 1, characterized in that, There are multiple connecting rows and multiple signal collectors, with each of the multiple connecting rows and multiple signal collectors connected in a one-to-one correspondence.

10. A battery pack, characterized in that, The device includes a battery cell and an integrated connection bus as described in any one of claims 1 to 9, wherein there are multiple battery cells and the integrated connection bus electrically connects the multiple battery cells together.

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