A connecting structure and a battery module
Patent Information
- Application Number
- CN202521331178.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-26
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-06-26
AI Technical Summary
In existing technologies, temperature sensors are placed on the busbar, which cannot accurately reflect the temperature of the battery cell itself, resulting in significant errors that affect the safety and performance of the battery system.
The extension of the connecting busbar contacts the side of the battery cell, and the temperature of the battery cell is directly detected by the acquisition module, avoiding the influence of the liquid cooling plate. The thermal conductive parts and elastic components are used to ensure stable contact and heat conduction.
This improves the accuracy and reliability of battery module temperature measurement, ensuring that the battery system operates within a safe temperature range and avoiding interference from the liquid cooling system on temperature detection.
Smart Images
Figure CN224934937U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of new energy battery technology, and in particular to a connection structure and battery module. Background Technology
[0002] With the rapid development of the new energy industry, lithium-ion batteries are widely used in electric vehicles, energy storage systems, and other fields. Battery systems typically consist of multiple cells connected in series and parallel to form battery modules or battery packs to meet energy density and power output requirements. Within battery modules or battery packs, busbars are typically used to connect the terminals of the cells to achieve current conduction and balanced distribution.
[0003] During use, cell temperature is one of the key parameters monitored by the battery management system. The reliability and accuracy of temperature monitoring directly affect the safety, performance, and lifespan of the battery system. Currently, the industry typically places temperature sensors on the busbar and indirectly detects the cell temperature through the contact between the busbar and the cell terminals. However, this existing solution has some significant drawbacks: because the cell terminal area is usually in direct or indirect contact with the liquid cooling plate, the temperature detected by the temperature sensor on the busbar is affected by the liquid cooling plate, failing to accurately reflect the actual temperature of the cell itself, and may even result in significant errors. Utility Model Content
[0004] In view of the shortcomings of the existing technology, this application provides a connection structure and a battery module that can improve the temperature measurement accuracy of the battery module.
[0005] To achieve the above objectives, this application adopts the following technical solution:
[0006] A connection structure includes a connecting busbar and a data acquisition module. The connecting busbar includes a main body and an extension, which are connected at an angle. The data acquisition module is connected to the extension and is used to detect the temperature of the battery cell.
[0007] In one embodiment, the extension includes a supporting surface and an inclined surface disposed opposite to each other. The supporting surface is connected to the acquisition module and is used to support the battery cell. The distance between the inclined surface and the supporting surface gradually decreases in the direction away from the main body.
[0008] In one embodiment, a fixing groove is formed on the side of the extension near the main body, and the acquisition module is assembled in the fixing groove.
[0009] In one embodiment, the length of the fixing groove is greater than the length of the acquisition module along the length direction of the extension.
[0010] In one embodiment, the acquisition module does not protrude from the fixing groove along the thickness direction of the extension.
[0011] In one embodiment, the connection structure includes a heat-conducting element that covers the acquisition module.
[0012] In one embodiment, the heat-conducting element covers the extension and is used to hold the extension and the battery cell together.
[0013] In one embodiment, the connecting busbar includes an elastic portion, which has a first end and a second end that are connected to each other. The first end is connected to the main body, and the second end is connected to the extension portion. The first end and the second end are connected by an arc.
[0014] In one embodiment, the thermal conductivity of the elastic portion is less than that of the extension portion.
[0015] In one embodiment, the extension includes a first end and a second end disposed opposite to each other, the first end of the extension is connected to the main body, and the acquisition module is disposed near the second end of the extension.
[0016] In one embodiment, the thickness of the heat-conducting element is 0.5 mm to 1 mm.
[0017] This application also adopts the following technical solution to provide a battery module, including a connection structure and a battery cell, wherein the top surface of the battery cell is connected to the main body, the side surface of the battery cell abuts against the extension, and the acquisition module contacts the side surface of the battery cell.
[0018] The beneficial effects of this application are as follows: This application provides a connection structure and a battery module. The connection busbar includes a main body and an extension, which are connected at an angle. A data acquisition module is connected to the extension and contacts the side of the battery cell. The data acquisition module is used to detect the temperature of the battery cell. Compared with the prior art, this application, by setting the extension and connecting it at an angle to the main body, keeps the extension away from the liquid cooling plate area. Through the spatial layout of the extension, the data acquisition module is removed from the effective range of the liquid cooling plate and directly obtains the heat conduction from the side wall of the battery cell, effectively eliminating thermal interference from the cooling system. This application can accurately obtain the actual temperature data of the battery cell body and avoid interference from the liquid cooling system on temperature detection. The battery module using this connection structure improves the accuracy of the battery management system in judging the thermal state of the battery cell, thereby ensuring that the battery system operates within a safe temperature range. Attached Figure Description
[0019] Figure 1 A schematic diagram of the structure of a battery module according to this application is shown;
[0020] Figure 2 A schematic diagram of a connection structure according to this application is shown;
[0021] Figure 3 It shows Figure 2 Enlarged diagram of point A in the diagram;
[0022] Figure 4 A cross-sectional schematic diagram of a battery module according to this application is shown;
[0023] Figure 5 It shows Figure 4 Enlarged diagram of point B in the image;
[0024] Figure 6 A cross-sectional schematic diagram of a connection structure according to this application is shown;
[0025] Figure 7 It shows Figure 6 Enlarged diagram of point C in the diagram;
[0026] Reference numerals: 100, connection structure; 200, battery cell;
[0027] 1. Connecting busbar; 11. Main body; 111. First side surface; 112. Second side surface; 12. Extension; 121. Supporting surface; 122. Inclined surface; 123. Fixing groove; 13. Elastic part;
[0028] 2. Data Acquisition Module;
[0029] 3. Heat-conducting components. Detailed Implementation
[0030] In this application, the terms "set up," "equipped with," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0031] The terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “radial,” and “circumferential” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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.
[0032] To make the objectives, technical solutions, and advantages of 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 not intended to limit the scope of this application.
[0033] See Figure 1 This application provides a battery module including a connection structure 100 and battery cells 200. Typically, multiple battery cells 200 are arranged one by one along the length of the connection structure 100, and the connection structure 100 is responsible for connecting these battery cells 200 in series or in parallel to form a battery module, thereby ensuring a stable power output.
[0034] See Figure 2 The connection structure 100 includes a connection busbar 1 and a data acquisition module 2. The connection busbar 1 includes a main body 11 and an extension 12, which are connected at an angle. Specifically, the main body 11 has adjacent first side surface 111 and second side surface 112. The first side surface 111 is connected to the top surface of the battery cell 200. The extension 12 can be connected to the second side surface 112 and extends along the thickness direction of the main body 11. The extension 12 abuts against the side surface of the battery cell 200. The data acquisition module 2 is connected to the extension 12 and contacts the side surface of the battery cell 200. The data acquisition module 2 is used to detect the temperature of the battery cell 200.
[0035] In practical applications, the main body 11 refers to the basic structure that carries the current conduction function. It can be injection molded, and its first side 111 is welded to the electrode post of the battery cell 200 for electrical connection. The extension 12 refers to a component extending from the main body 11. It can be integrally molded with the main body 11, and the extension 12 extends along the thickness direction of the main body 11 to form a component that abuts against the side of the battery cell 200. The acquisition module 2 refers to a temperature sensing unit, which can be a thermistor or thermocouple. It is installed on the side of the extension 12 near the side of the battery cell 200. Through the contact between the extension 12 and the battery cell 200, the acquisition module 2 can be tightly attached to the side of the battery cell 200 to facilitate temperature measurement.
[0036] Specifically, the main body 11 is directly connected to the electrode of the battery cell 200 via the first side 111 to achieve current transmission. The extension 12 extends along a direction perpendicular to the first side 111 (that is, the thickness direction of the main body 11) to form a cantilever structure, and the acquisition module 2 is connected to the extension 12. This arrangement avoids the electrode area directly affected by the liquid cooling plate. When the extension 12 contacts the side of the battery cell 200, heat is directly conducted to the acquisition module 2, so that the acquisition module 2 can accurately reflect the actual temperature of the battery cell 200 body.
[0037] Compared to existing technologies, this application, by providing an extension portion 12 connected at an angle to the main body 11, moves the extension portion 12 away from the liquid cooling plate area. This allows the acquisition module 2 to be removed from the effective range of the liquid cooling plate, directly acquiring the heat conduction from the sidewall of the cell 200, effectively eliminating thermal interference from the cooling system. This application can accurately acquire the actual temperature data of the cell 200 body, avoiding interference from the liquid cooling system on temperature detection, improving the accuracy of the battery management system in judging the thermal state of the cell 200, and thus ensuring that the battery system operates within a safe temperature range.
[0038] It should be noted that the extension 12 only needs to be connected to the main body 11 at an angle, and the connection point of the extension 12 is not limited. For example, the extension 12 can also be connected to the first side 111 of the main body 11.
[0039] See Figure 3 The extension 12 includes a support surface 121 and an inclined surface 122 disposed opposite to each other. The support surface 121 is connected to the acquisition module 2 and is used to support the battery cell 200. The distance between the inclined surface 122 and the support surface 121 gradually decreases along the direction away from the main body 11.
[0040] In practical applications, the abutment surface 121 forms a surface contact with the surface of the battery cell 200, and the acquisition module 2 is located on the side of the abutment surface 121, ensuring stable contact between the acquisition module 2 and the battery cell 200. The inclined surface 122 forms a gradually narrowing space with the abutment surface 121. Specifically, the inclined surface 122 is inclined from top to bottom towards the abutment surface 121. The preload generated by this inclined structure keeps the abutment surface 121 and the battery cell 200 at a constant contact pressure, preventing the contact interface from loosening under vibration.
[0041] In one embodiment, the extension 12 includes a first end and a second end disposed opposite to each other along its length. The first end of the extension 12 is connected to the main body 11, and the acquisition module 2 is disposed near the second end of the extension 12. Specifically, the second end of the extension 12 is the end away from the main body 11. Since the extension 12 extends obliquely from the first end to the second end, the pre-tightening force generated by the oblique surface 122 allows the second end to be firmly pressed against the side of the battery cell 200. Therefore, placing the acquisition module 2 near the second end can increase the clamping force between the acquisition module 2 and the battery cell 200, thereby improving the measurement accuracy of the acquisition module 2.
[0042] See Figure 4 and Figure 5 A fixing groove 123 is formed on the side of the extension 12 near the main body 11, and the acquisition module 2 is assembled in the fixing groove 123.
[0043] In practical applications, a fixing groove 123 is formed on the side of the extension 12 near the battery cell 200, that is, the fixing groove 123 is formed on the abutment surface 121, so that the acquisition module 2 is restricted to a position close to the battery cell 200. The side wall of the fixing groove 123 limits the acquisition module 2, preventing it from shifting under vibration or impact, and avoiding contact problems caused by mechanical vibration. By optimizing the installation position of the acquisition module 2, the detection data can more directly reflect the true temperature of the battery cell 200 body, improving the accuracy and reliability of temperature monitoring.
[0044] See again Figure 5 Along the length of the extension 12, the length of the fixing groove 123 is greater than the length of the acquisition module 2.
[0045] In practical applications, the length of the fixing slot 123 is set to be greater than the length of the acquisition module 2, allowing the acquisition module 2 to have an adjustable installation position within the fixing slot 123 along the length of the extension 12. When there are differences in the height of the battery cells 200, the position of the acquisition module 2 can be adaptively adjusted according to changes in the heat concentration area of the battery cells 200. By moving the acquisition module 2 closer to the core heat-generating area of the battery cells 200, the authenticity and stability of the temperature detection signal are ensured.
[0046] In one embodiment, the acquisition module 2 does not protrude from the fixing groove 123 along the thickness direction of the extension 12.
[0047] In practical applications, the acquisition module 2 is embedded in the fixing groove 123, and its surface can remain flush with the inner wall of the fixing groove 123. Since the acquisition module 2 does not protrude from the fixing groove 123, when the battery cell 200 abuts against the extension 12, the acquisition module 2 will not directly contact or squeeze the side of the battery cell 200, thereby avoiding damage to the surface of the battery cell 200 due to mechanical interference.
[0048] See again Figure 5 The connection structure 100 includes a heat-conducting component 3, which covers the acquisition module 2.
[0049] In practical applications, the heat-conducting component 3 refers to a material with thermal conductivity, which can be made of flexible materials such as silicone. It is used to promote heat transfer between the acquisition module 2 and the battery cell 200. Furthermore, the heat-conducting component 3 physically covers the sharp edges of the acquisition module 2 to prevent it from scratching the surface of the battery cell 200 during assembly.
[0050] In one embodiment, the thickness of the heat-conducting element 3 can be 0.5mm to 1mm. Specifically, if the heat-conducting element 3 is too thin, it will affect the protection effect and fail to effectively protect the battery cell 200; if the heat-conducting element 3 is too thick, it will affect the contact between the extension 12 and the battery cell 200, resulting in a large gap between the acquisition module 2 and the battery cell 200, which will prevent the acquisition module 2 from accurately measuring the temperature of the battery cell 200. Therefore, the thickness of the heat-conducting element 3 is limited to 0.5mm to 1mm. For example, the heat-conducting element 3 can be set to 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1mm.
[0051] See again Figure 5 The heat-conducting element 3 covers the extension 12 and is used to clamp between the extension 12 and the battery cell 200.
[0052] In practical applications, after the heat-conducting element 3 covers the surface of the extension 12, it is sandwiched between the contact interface between the extension 12 and the battery cell 200. When the temperature of the battery cell 200 changes, heat is directly transferred to the collection module 2 on the extension 12 through the heat-conducting element 3, while the physical isolation effect of the heat-conducting element 3 can prevent collision and compression between the battery cell 200 and the extension 12. Thus, the flexible characteristics of the heat-conducting element 3 can buffer the mechanical stress between the extension 12 and the battery cell 200, preventing damage to the surface of the battery cell 200 caused by rigid contact.
[0053] See Figure 6 and Figure 7 The connecting busbar 1 includes an elastic part 13, which has a first end and a second end that are connected to each other. The first end is connected to the main body part 11, and the second end is connected to the extension part 12. The first end and the second end are connected by an arc.
[0054] In practical applications, the elastic part 13 refers to the deformable structure connecting the main body 11 and the extension 12. Its thickness can be less than that of the main body 11 to provide elastic deformation capability. The first end refers to the starting end where the elastic part 13 connects to the main body 11, which can be achieved by welding or integral molding, and is used to transmit the mechanical support of the main body 11. The second end refers to the ending end where the elastic part 13 connects to the extension 12, which can be formed into a continuous structure with the extension 12 through a bending process, and is used to maintain the relative position of the extension 12 and the battery cell 200. The arc connection refers to the transition area between the first end and the main body 11, and between the second end and the extension 12, being arc-shaped, to disperse stress concentration.
[0055] Specifically, the elastic part 13 provides elasticity, allowing the extension 12 to press firmly against the side of the battery cell 200, thus providing contact stability between the acquisition module 2 and the battery cell 200. Furthermore, the elastic part 13 can elastically deform when the battery cell 200 undergoes thermal expansion or mechanical vibration. When the volume of the battery cell 200 changes, the bending deformation of the elastic part 13 buffers the displacement difference between the main body 11 and the extension 12, preventing the extension 12 from separating from the contact surface of the battery cell 200, while maintaining a stable contact pressure between the extension 12 and the battery cell 200. The elastic part 13 allows the extension 12 to have a small amount of displacement space when the volume of the battery cell 200 changes, preventing excessive compression between the extension 12 and the battery cell 200, which could damage the battery cell 200. Even during the volume change of the battery cell 200, the extension 12 can always press firmly against the side of the battery cell 200, improving the temperature measurement accuracy of the acquisition module 2.
[0056] In one embodiment, the thermal conductivity of the elastic portion 13 is lower than that of the extension portion. When a material with low thermal conductivity is used, the elastic portion 13 can block the transfer of heat from the main body 11 to the extension portion 12. Since the main body 11 is in contact with the liquid cooling plate, to avoid the temperature of the liquid cooling plate affecting the acquisition module 2, the use of the elastic portion 13 with low thermal conductivity ensures that the temperature detected by the acquisition module 2 is not affected by the heat conduction of the main body 11, effectively cutting off the heat conduction path between the liquid cooling plate and the acquisition module 2. At the same time, the extension portion 12, which has a higher thermal conductivity, can quickly transfer the temperature of the battery cell 200 to the acquisition module 2, achieving more accurate temperature monitoring of the battery cell 200.
[0057] 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 at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0058] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0059] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.
Claims
1. A connection structure, characterized in that, include: A connecting busbar includes a main body and an extension, wherein the main body and the extension are connected at an included angle. A data acquisition module is connected to the extension portion and is used to detect the temperature of the battery cell. The extension portion includes a support surface and an inclined surface disposed opposite to each other. The support surface is connected to the data acquisition module and is used to support the battery cell. The distance between the inclined surface and the support surface gradually decreases along the direction away from the main body.
2. The connection structure according to claim 1, characterized in that, A fixing groove is formed on the side of the extension near the main body, and the acquisition module is assembled in the fixing groove.
3. The connection structure according to claim 2, characterized in that, Along the length direction of the extension, the length of the fixing groove is greater than the length of the acquisition module.
4. The connection structure according to claim 2, characterized in that, Along the thickness direction of the extension, the acquisition module does not protrude from the fixing groove.
5. The connection structure according to any one of claims 1 to 4, characterized in that, The connection structure includes a heat-conducting component, which covers the acquisition module.
6. The connection structure according to claim 5, characterized in that, The thermal conductive element covers the extension and is used to clamp the extension and the battery cell.
7. The connection structure according to any one of claims 1 to 4, characterized in that, The connecting busbar includes an elastic portion, which has a first end and a second end that are connected to each other. The first end is connected to the main body, and the second end is connected to the extension portion. The first end and the second end are connected by an arc.
8. The connection structure according to claim 7, characterized in that, The thermal conductivity of the elastic portion is less than that of the extension portion.
9. The connection structure according to any one of claims 1 to 4, characterized in that, The extension includes a first end and a second end disposed opposite to each other. The first end of the extension is connected to the main body, and the acquisition module is disposed near the second end of the extension.
10. The connection structure according to claim 5, characterized in that, The thickness of the heat-conducting component is 0.5mm to 1mm.
11. A battery module, characterized in that, Includes the connection structure and battery cell as described in any one of claims 1 to 10, wherein the top surface of the battery cell is connected to the main body, the side surface of the battery cell abuts against the extension, and the acquisition module contacts the side surface of the battery cell.