Embedded temperature detection terminal of power battery pole and pole structure
By embedding the terminal post and the thermistor into the battery terminal post and utilizing the clip and spring structure design, the problem of insufficient temperature detection accuracy in the existing technology is solved, and higher temperature detection accuracy and safety are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUHU JUXUAN METAL TECH CO LTD
- Filing Date
- 2025-04-22
- Publication Date
- 2026-04-21
AI Technical Summary
In the existing technology, the temperature detection terminal of the power battery post is susceptible to external environmental influences due to the connection lugs and the surface of the post, resulting in insufficient temperature detection accuracy and posing a safety hazard.
An embedded temperature detection terminal is adopted. By embedding the terminal post and the thermistor into the preset slot of the battery terminal post, the structural design of the clip and spring is used to make the clip stick tightly to the inner wall of the terminal post after being squeezed, so as to achieve stable embedding. Heat is transferred to the thermistor through the heat conduction coil for temperature detection.
It improves the accuracy and stability of temperature detection, reduces the impact of the external environment on temperature detection, and enhances safety.
Smart Images
Figure CN224153424U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power battery technology, specifically to an embedded temperature detection terminal and terminal structure for a power battery terminal. Background Technology
[0002] Battery terminals are a crucial component of a battery pack, primarily used to establish electrical connections between individual battery cells and external circuits. Both charging and discharging of a power battery require connection to the corresponding circuits via these terminals. Therefore, heat is generated at the terminals during charging and discharging, making terminal temperature monitoring essential for battery safety.
[0003] Currently, temperature sensing terminals of thermistors are commonly used to monitor the temperature of the battery terminals. The principle involves mechanically clamping a connector (also called a terminal block) onto the outside of the thermistor. The connector is made of a metal with high thermal conductivity. By welding or tightening the connector onto the terminal block with a nut, heat conduction is achieved between the connector and the terminal block, allowing temperature changes in the terminal block to be transmitted to the thermistor for temperature monitoring. While this external connection method achieves good temperature detection, the main contact area between the connector and the terminal block is the connector hole wall, resulting in a large portion of the connector being exposed to the outside. This makes it susceptible to external influences, reducing the accuracy of temperature measurements. Furthermore, the outside of the terminal block is also in direct contact with the air outside the battery, causing its surface temperature to be affected by the ambient temperature. Therefore, the combined effect of the ambient temperature on the terminal block surface temperature and the influence of the connector surface temperature further affects the accuracy of temperature measurements using external temperature sensing terminals.
[0004] Therefore, the existing temperature detection terminals that use external connectors to detect the surface temperature of the electrode post are prone to insufficient accuracy and pose certain safety hazards because both the connector and the surface of the electrode post connected to it are easily affected by the external environment. Utility Model Content
[0005] The purpose of this utility model is to provide an embedded temperature detection terminal and terminal structure for a power battery terminal, so as to solve the technical problem that the accuracy of detection is insufficient because the wiring lug and the surface of the terminal connected to it are easily affected by the external environment.
[0006] To solve the above-mentioned technical problems, this utility model specifically provides the following technical solution:
[0007] An embedded temperature detection terminal for a power battery terminal includes an end post for embedding in a preset slot of the battery terminal. A thermistor for sensing temperature is provided at the front end of the end post, and a wire is connected to the rear end of the thermistor. A channel is provided in the end post, and the wire extends through the channel to the outside of the tail end of the end post to connect to a monitoring system to monitor the temperature of the battery terminal.
[0008] The end post has a groove arranged in a circular array on its outer wall. A retaining strip is provided at one end of the groove near the thermistor. A spring is provided inside the retaining strip. The other end of the spring is fixed in the groove away from the thermistor, so as to push the end of the retaining strip away from the thermistor outward.
[0009] When the thermistor and the end post are inserted into the preset slot of the battery terminal, the locking strip is gradually pressed into the channel by the preset slot of the battery terminal. At the same time, the locking strip compresses the elastic deformation of the spring piece, so that after the thermistor and the end post are fully inserted into the preset slot of the battery terminal, the elastic force of the spring piece pushes the locking strip to press tightly against the inner wall of the preset slot of the battery terminal, thereby achieving stable embedding temperature detection.
[0010] As a preferred embodiment of this utility model, the depth of the channel at the end near the thermistor is less than the depth at the end away from the thermistor, so that the card strip and the spring can be completely incorporated.
[0011] In a preferred embodiment of this utility model, the thermistor has a cylindrical structure with a round end, the diameter of the end post being larger than the diameter of the tail end of the thermistor, and a thermally conductive ring is fitted around the thermistor, the thermally conductive ring being tightly abutting the front end of the end post.
[0012] The channel extends through the front end of the end post to form an opening. The base connected to the channel is welded to the end face of the heat-conducting ring through the front opening of the channel. After the card contacts the inner wall of the preset slot of the battery terminal, the heat of the battery terminal is transferred to the thermistor through the heat-conducting ring.
[0013] As a preferred embodiment of this utility model, the card strip is made of a shape memory alloy material that can deform. When the card strip is squeezed into the preset slot of the battery terminal, it bends so that the part of the card strip that is stretched to the outside can fit tightly against the inner wall of the preset slot of the battery terminal.
[0014] As a preferred embodiment of this utility model, a stop cap is provided at the tail end of the end post, the inner wall of the stop cap is arc-shaped, and the channel passes through the tail end of the end post and communicates with the interior of the stop cap.
[0015] The cap portion is open to expose the channel, and one side of the cap's inner arc surface smoothly transitions to the inner wall of the channel, while the tail end of the other side's inner arc surface forms a plane parallel to the end face of the end post, so as to guide the wire to extend along an axis perpendicular to the end post.
[0016] An embedded temperature detection terminal structure for temperature measurement using the above-mentioned power battery terminal includes a column body, the upper end of which is provided with a slot for installing the terminal post, the thermistor and the retaining strip.
[0017] Wherein, the radius of the slot is greater than or equal to the radius of the end post, and less than the axial distance from the end of the retaining strip away from the thermistor to the end post, and the inner wall of the slot is provided with threads so that after the end post and the thermistor are fully inserted, the threads restrict the retaining strip from moving outward, preventing the end post and the thermistor from coming out.
[0018] Compared with the prior art, this utility model has the following advantages:
[0019] This utility model adopts an embedded temperature measurement method. By connecting the end post and the thermistor to form an insertable structure, a groove is formed on the side wall of the end post to install a retaining strip and a spring. The spring can push the retaining strip outward so that after the end post and the thermistor are fully embedded, the spring pushes the retaining strip to press against the inner wall of the preset groove of the electrode post, thereby achieving stable embedding inside the electrode post and accurate temperature measurement. Attached Figure Description
[0020] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.
[0021] Figure 1 A schematic diagram of the embedded temperature detection terminal of the power battery terminal is provided for an embodiment of this utility model;
[0022] Figure 2 A schematic diagram of the cap portion of the embedded temperature detection terminal of the power battery terminal is provided for an embodiment of this utility model;
[0023] Figure 3 A schematic diagram of the terminal structure of a power battery terminal is provided for an embodiment of this utility model.
[0024] The labels in the diagram represent the following:
[0025] 1-Column; 2-End post; 3-Thermistor; 4-Clip strip;
[0026] 11-Slot; 12-Thread; 21-Channel; 22-Gateway; 23-Cap; 31-Wire; 32-Heat-conducting coil; 41-Spring. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0028] like Figure 1 As shown, this utility model provides an embedded temperature detection terminal for a power battery terminal, including a terminal post 2 for embedding in a preset slot in the battery terminal, a thermistor 3 for sensing temperature is provided at the front end of the terminal post 2, a wire 31 is connected to the rear end of the thermistor 3, a channel 21 is provided in the terminal post 2, and the wire 31 extends through the channel 21 to the outside of the tail end of the terminal post 2 to connect to a monitoring system to monitor the temperature of the battery terminal.
[0029] Among them, a channel 22 arranged in a circular array is provided on the outer wall of the end post 2. A retaining strip 4 is provided at one end of the channel 22 near the thermistor 3. A spring piece 41 is provided on the inner side of the retaining strip 4, and the other end of the spring piece 41 is fixed in the channel 22 away from the thermistor 3, so as to push the end of the retaining strip 4 away from the thermistor 3 outward.
[0030] When the thermistor 3 and the end post 2 are inserted into the preset slot of the battery terminal, the clip 4 is gradually squeezed into the channel 22 by the preset slot of the battery terminal. At the same time, the clip 4 squeezes the elastic deformation of the spring 41 so that after the thermistor 3 and the end post 2 are fully inserted into the preset slot of the battery terminal, the elastic force of the spring 41 pushes the clip 4 to press tightly against the inner wall of the preset slot of the battery terminal, so as to achieve stable embedded temperature detection.
[0031] The embedded temperature detection terminal in this embodiment mainly connects the terminal post 2 and the thermistor 3 to form an embedded structure. Multiple slots 22 are provided on the side wall of the terminal post 2 to install the retaining strips 4. The inner side of the retaining strips 4 is fixed with spring pieces 41 in the slots 22, so that each retaining strip 4 is pushed outward by the spring pieces 41. When the terminal post 2 and the thermistor 3 are inserted into the preset slot of the battery terminal, the retaining strips 4 are squeezed and the spring pieces 41 are forced to deform and store energy. After the terminal post 2 and the thermistor 3 are fully inserted, the retaining strips 4 are pushed and pressed tightly against the inner wall of the preset slot of the battery terminal by the spring pieces 41, so as to achieve stable embedded temperature detection.
[0032] Furthermore, after the terminal post 2 and the thermistor 3 are fully embedded, the wire 31 extends through the channel 21 to the outside of the tail end of the terminal post 2, thereby enabling the connection to a monitoring system to monitor the battery terminal temperature.
[0033] In order to facilitate installation and reduce the embedding resistance of the temperature detection terminal, the front end of the thermistor 3 is designed as a spherical surface, while the rear end is designed as a round surface to connect with the end face of the end post 2. The connection method can be high-temperature adhesive bonding, welding, or mechanical connection.
[0034] Compared to existing temperature sensing terminals that use external connectors to detect the surface temperature of the electrode post, this invention adopts an embedded temperature measurement method. After connecting the end post 2 and the thermistor 3 to form an embedded structure, a groove 22 is formed on the side wall of the end post 2 to install a retaining strip 4 and a spring 41. The spring 41 can push the retaining strip 4 outward so that after the end post 2 and the thermistor 3 are fully embedded, the spring 41 pushes the retaining strip 4 to press against the inner wall of the preset groove of the electrode post, achieving stable embedding inside the electrode post for accurate temperature measurement.
[0035] Among them, such as Figure 1 As shown, the depth of the channel 22 near the thermistor 3 is less than the depth of the end away from the thermistor 3, so that the card strip 4 and the spring 41 can be fully accommodated. The channel 22 gradually deepens from front to back, which can effectively accommodate the overlapping part of the card strip 4 and the spring 41.
[0036] In the above embodiments, the temperature measurement of the terminal mainly depends on the contact between the thermistor 3 and the electrode post. Therefore, for electrode post structures with a preset slot diameter larger than that of the thermistor 3, it is difficult to achieve embedded temperature measurement. In other words, the accuracy of embedded temperature measurement is insufficient, and there is also a high risk of detachment.
[0037] Therefore, in order to make the embedded temperature sensing terminal more widely applicable, the following preferred embodiments are provided.
[0038] like Figure 1 As shown, the thermistor 3 has a cylindrical structure with a round end. The diameter of the end post 2 is larger than the diameter of the tail end of the thermistor 3. A heat-conducting ring 32 is fitted on the outside of the thermistor 3, and the heat-conducting ring 32 is tightly against the front end of the end post 2.
[0039] The channel 22 forms an opening at the front end of the end post 2. The base connected to the channel 22 and the clip 4 is welded to the end face of the heat-conducting ring 32 through the front opening of the channel 22. After the clip 4 contacts the inner wall of the preset slot of the battery terminal, the heat of the battery terminal is transferred to the thermistor 3 through the heat-conducting ring 32.
[0040] In this embodiment, by optimizing the diameters of the end post 2 and the thermistor 3, a position is reserved for installing the heat-conducting ring 32 after the end post 2 is connected to the thermistor 3, so that the heat-conducting ring 32 is tightly wrapped around the outside of the thermistor 3 and connected to the end of the end post 2, and the closed channel 22 penetrates through the front end of the end post 2 to form an opening.
[0041] Thus, the fixed end of the clip 4 can be welded to the heat-conducting ring 32 through the opening of the slot 22, thereby enabling the clip 4 to transfer temperature to the heat-conducting ring 32, and the heat-conducting ring 32 is preferably made of a metal or alloy with a high thermal conductivity. Therefore, when embedded in a pre-set slot of a battery terminal with a slightly larger diameter, multiple clips 4 can press against the inner wall of the slot to transfer the internal temperature of the terminal to the heat-conducting ring 32, and the heat-conducting ring 32 can transfer heat to the thermistor 3, realizing embedded temperature measurement of terminals with various pre-set slot specifications.
[0042] Furthermore, since the thermistor 3 is embedded inside the electrode, heat loss can be effectively reduced, ensuring high-precision temperature measurement even inside the electrode with a large preset slot.
[0043] Of course, in order to further improve the temperature measurement effect, such as Figure 1 and Figure 3 As shown, the card strip 4 is made of a shape memory alloy material that can deform. When the card strip 4 is squeezed into the preset slot of the battery terminal, it bends so that the part of the card strip 4 that is stretched to the outside can fit tightly against the inner wall of the preset slot of the battery terminal.
[0044] In this embodiment, since the clip 4 is made of a shape memory alloy material that can deform, when the clip 4 enters the preset slot of the electrode post, the front half is squeezed and presses against the spring sheet 41, while the rear half loses the support of the spring sheet and deforms, causing the clip 4 to bend and move along the inner wall of the preset slot of the electrode post. Thus, after the end post 2 and the thermistor 3 are fully embedded, the clip 4 can adhere tightly to the inner wall of the preset slot of the electrode post over a large area, thereby further improving the temperature transfer speed and effectively improving the temperature measurement effect.
[0045] Furthermore, the memory alloy material clip 4 can be restored to its original shape after the end post 2 and the thermistor 3 are removed from the electrode post, thus enabling multiple reuses.
[0046] Furthermore, in the above embodiments, since the end post 2 and the thermistor 3 are embedded perpendicular to the end face of the electrode post, the wire 31 extends upwards, making it susceptible to damage from compression during use. Also, without restraint, the wire 31 tends to form a high bend above the end post 2 after horizontal wiring, occupying a significant amount of vertical space. Based on this, the following preferred embodiments are provided.
[0047] like Figure 1 , Figure 2As shown, a stop cap 23 is provided at the tail end of the end post 2. The inner wall of the stop cap 23 is arc-shaped, and the channel 21 passes through the tail end of the end post 2 and is connected to the interior of the stop cap 23.
[0048] The cap 23 partially exposes the channel 21, and one side of the inner arc surface of the cap 23 smoothly transitions to the inner wall of the channel 21, while the tail end of the other side of the inner arc surface forms a plane parallel to the end face of the end post 2, so as to guide the wire 31 to extend along the axis perpendicular to the end post 2.
[0049] In this embodiment, by setting a stop cap 23 at the tail end of the end post 2, the channel opening of the channel 21 is blocked, and the inner wall of the stop cap 23 is arc-shaped and smoothly connects to the inner wall of the channel 21 to guide the wire 31 to bend and lay wires, and to bind and protect the bend. This can reduce the vertical space occupation caused by the free bending of the wire 31, and also protect the bend of the wire 31.
[0050] Based on the above-mentioned embedded temperature detection terminal, the following provides a terminal structure for a power battery terminal, including a column 1, with a slot 11 provided at the upper end of the column 1, the slot 11 being used to install a terminal post 2, a thermistor 3, and a retaining strip 4.
[0051] The radius of the slot 11 is greater than or equal to the radius of the end post 2, and less than the axial distance from the end of the clip 4 away from the thermistor 3 to the end post 2. The inner wall of the slot 11 is provided with a thread 12 so that after the end post 2 and the thermistor 3 are fully inserted, the thread 12 restricts the clip 4 from moving outward, preventing the end post 2 and the thermistor 3 from coming out.
[0052] In this embodiment, the terminal structure mainly consists of an inwardly recessed groove 11 formed at the end of the post 1, which can accommodate the terminal post 2 and the thermistor 3. During this process, the retaining strip 4 also enters the groove 11 and presses against the inner wall of the groove 11. Since power batteries are typically used in vehicles, various bumpy road conditions can cause the temperature detection terminal to have vertical inertia, posing a risk of it coming loose.
[0053] Therefore, by setting a thread 12 on the inner wall of the slot 11, the locking strip 4 can be locked by the thread 12 after entering the slot 11, thereby preventing it from moving outward, realizing the anti-detachment of the temperature detection terminal, and thus achieving stable detection.
[0054] Furthermore, since the slot 11 is equipped with a thread 12 to prevent detachment, the thread 12 and the retaining strip 4 can also achieve a good anti-detachment effect for the insertion fit of the slot 11, which is slightly larger than the diameter of the end post 2. Moreover, during disassembly, the retaining strip 4 can be removed along the thread 12 simply by rotating the end post 2, thus achieving non-destructive removal of the temperature detection terminal.
[0055] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.
Claims
1. A temperature detection terminal of a power battery pole, characterized in that, Includes an end post (2) for embedding in a preset slot of a battery terminal post, the front end of the end post (2) is provided with a thermistor (3) for sensing temperature, the rear end of the thermistor (3) is connected with a wire (31), a channel (21) is provided in the end post (2), and the wire (31) extends through the channel (21) to the outside of the tail end of the end post (2) to connect to a monitoring system to monitor the temperature of the battery terminal post; Among them, a channel (22) arranged in a circular array is provided on the outer wall of the end post (2). A retaining strip (4) is provided at one end of the channel (22) near the thermistor (3). A spring piece (41) is provided on the inner side of the retaining strip (4), and the other end of the spring piece (41) is fixed in the channel (22) away from the thermistor (3) to push the end of the retaining strip (4) away from the thermistor (3) outward. When the thermistor (3) and the end post (2) are inserted into the preset slot of the battery terminal, the locking strip (4) is gradually squeezed into the channel (22) by the preset slot of the battery terminal. At the same time, the locking strip (4) squeezes the elastic deformation of the spring piece (41) so that after the thermistor (3) and the end post (2) are fully inserted into the preset slot of the battery terminal, the elastic force of the spring piece (41) pushes the locking strip (4) to press tightly against the inner wall of the preset slot of the battery terminal, thereby achieving stable embedded temperature detection.
2. The temperature detection terminal for a power battery terminal according to claim 1, characterized in that, The depth of the channel (22) near the thermistor (3) is less than the depth of the end away from the thermistor (3) so that it can be fully incorporated into the clip (4) and the spring (41).
3. A temperature detection terminal for a power battery terminal according to claim 1 or 2, characterized in that, The thermistor (3) has a cylindrical structure with round ends. The diameter of the end post (2) is larger than the diameter of the tail end of the thermistor (3). A heat-conducting ring (32) is fitted on the outside of the thermistor (3). The heat-conducting ring (32) is close to the front end of the end post (2). The channel (22) forms an opening through the front end of the end post (2). The base connected to the channel (22) of the clip (4) is welded to the end face of the heat-conducting ring (32) through the front opening of the channel (22). After the clip (4) contacts the inner wall of the preset slot of the battery terminal, the heat of the battery terminal is transferred to the thermistor (3) through the heat-conducting ring (32).
4. The temperature detection terminal for a power battery terminal according to claim 3, characterized in that, The card strip (4) is made of a shape memory alloy material that can deform. When the card strip (4) is squeezed into the preset slot of the battery terminal, it bends so that the part of the card strip (4) that is stretched to the outside can fit tightly against the inner wall of the preset slot of the battery terminal.
5. A temperature detection terminal for a power battery terminal according to claim 4, characterized in that, A stop cap (23) is provided at the tail end of the end post (2). The inner wall of the stop cap (23) is arc-shaped, and the channel (21) passes through the tail end of the end post (2) and is connected to the interior of the stop cap (23). The cap (23) partially exposes the channel (21), and one side of the inner arc surface of the cap (23) smoothly transitions to the inner wall of the channel (21), while the tail end of the other side of the inner arc surface forms a plane parallel to the end face of the end post (2) to guide the wire (31) to extend along an axis perpendicular to the end post (2).
6. An embedded temperature detecting terminal embedded temperature detecting pole structure using the pole of any one of claims 1-5, characterized in that, Includes a column (1), the upper end of which is provided with a slot (11), the slot (11) being used to install the end post (2), the thermistor (3) and the clip (4); The radius of the slot (11) is greater than or equal to the radius of the end post (2) and less than the axial distance from the end of the clip (4) away from the thermistor (3) to the end post (2). The inner wall of the slot (11) is provided with a thread (12) so that after the end post (2) and the thermistor (3) are fully inserted, the thread (12) restricts the clip (4) from moving outward, preventing the end post (2) and the thermistor (3) from coming out.