Battery cell testing device
By designing partition grooves for electrical connectors and fasteners to fix the current test leads in the cell testing device, the problem of small contact area between the current test leads and electrical connectors was solved, thereby improving the accuracy of cell performance test results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU RELIANCE ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-06-19
- Publication Date
- 2026-06-26
AI Technical Summary
In existing battery cell testing devices, the small contact area between the current test leads and the electrical connectors results in high resistance, excessive heat generation, and negatively impacts battery cell performance and the accuracy of voltage test results.
The design employs an electrical connector, which includes a partition groove between the first and second connecting parts. The current test lead is embedded in the connecting hole, and the current test lead is fixed by fasteners, thereby increasing the contact area, reducing resistance, and reducing heat generation.
By increasing the contact area between the current test lead and the electrical connector, the impact of heat on the cell performance and voltage test results is reduced, thereby improving the accuracy of the test results.
Smart Images
Figure CN224417001U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery cell testing technology, specifically to a battery cell testing device. Background Technology
[0002] Battery cell testing equipment can be used to test relevant performance parameters of battery cells, such as charge / discharge energy, internal resistance, and state of charge (SOC). In related technologies, during the testing process, both the current and voltage test leads of the testing equipment are fixed to electrical connectors using clips. The connectors are then soldered to the battery cell before the tests are completed. However, in these technologies, the small contact area between the current test leads and the connectors results in high resistance and excessive heat generation during testing. This not only affects the battery cell's performance but also the voltage test results, ultimately leading to lower accuracy in the final test results. Utility Model Content
[0003] To address the aforementioned technical problems, embodiments of this application provide a battery cell testing device that can reduce the resistance between the current test line and the electrical connection piece, reduce the generated heat, and improve the accuracy of the test results.
[0004] Firstly, a battery cell testing device is provided, comprising:
[0005] Test cabinet, including current test leads and voltage test leads;
[0006] An electrical connector includes a first connecting part and a second connecting part. The first connecting part has a connecting hole, and the current test wire is embedded in the connecting hole. The second connecting part is connected to the first connecting part and the second connecting part is connected to the voltage test wire.
[0007] A fastener, which mates with the connecting hole, is used to press and fix the current test lead together with the first connecting part.
[0008] According to a first aspect of this application, a partition groove is provided between the first connecting portion and the second connecting portion so that the first connecting portion and the second connecting portion are spaced apart along a first direction; wherein, the first direction characterizes the width direction of the electrical connecting piece.
[0009] According to a first aspect of this application, the first connecting portion includes:
[0010] The main body and the second connecting portion are spaced apart along the first direction;
[0011] A protruding end is connected to the body. The protruding end protrudes relative to the body and the second connecting portion along a second direction. The maximum width of the protruding end along the first direction is greater than the maximum width of the body along the first direction. The connecting hole is provided on the protruding end. The second direction represents the length direction of the electrical connecting piece, and the second direction is perpendicular to the first direction.
[0012] According to a first aspect of this application, one end of the partition groove extends through the edge of the electrical connector piece along the second direction; wherein the second direction represents the length direction of the electrical connector piece, and the second direction is perpendicular to the first direction.
[0013] According to a first aspect of this application, the width of the dividing groove along the first direction is A, wherein A satisfies: 1.5mm ≤ A ≤ 2.5mm.
[0014] According to a first aspect of this application, the electrical connector further includes:
[0015] The third connecting part connects the first connecting part and the second connecting part, and the third connecting part is provided with a heat dissipation groove.
[0016] According to a first aspect of this application, one end of the heat dissipation groove extends through the edge of the electrical connection piece in a direction away from the first connection portion and the second connection portion in a second direction.
[0017] According to a first aspect of this application, the electrical connector further includes:
[0018] The fourth connecting part has one end connected to the third connecting part and the other end connected to the first connecting part and the second connecting part.
[0019] According to a first aspect of this application, the width of the heat sink along a first direction is B, wherein B satisfies: 1.5mm≤B≤2.5mm; wherein the first direction characterizes the width direction of the electrical connection piece.
[0020] According to a first aspect of this application, the third connecting portion has an arc-shaped chamfer at one end away from the first connecting portion and the second connecting portion.
[0021] The battery cell testing device provided in this application embodiment has a connection hole in the first connection part, into which a current test wire is embedded. A fastener engages with the connection hole, and the fastener and the first connection part can press against the current test wire. Under the combined action of the fastener and the first connection part, the current test wire can be fixed to the first connection part. This embodiment utilizes the fastener to press and fix the current test wire, allowing more of the current test wire to be pressed and fixed to the first connection part (because the end face area of the fastener used to press against the current test wire is significantly larger than the clamping surface area of the clip used to hold the current test wire). This effectively increases the contact area between the current test wire and the first connection part, reduces the resistance between them, thereby reducing the heat generated during testing, minimizing the impact of heat on the battery cell performance and voltage test line detection results, and improving the accuracy of the final battery cell performance test results. Attached Figure Description
[0022] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.
[0023] Figure 1 This is a schematic diagram of the structure of an electrical connector provided for an exemplary embodiment of this application.
[0024] Reference numerals: 100-Electrical connector; 110-First connector; 111-Body; 112-Protruding end; 120-Second connector; 130-Connecting hole; 140-Separating groove; 150-Third connector; 160-Heat dissipation groove; 170-Fourth connector; 180-Chamfered corner. Detailed Implementation
[0025] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.
[0026] The battery cell testing device provided in this application embodiment may include a test cabinet, which includes current test leads and voltage test leads. Current can be transferred between the test cabinet and the battery cell via the current test leads, facilitating the testing of the battery cell's charge and discharge performance. The test cabinet can detect the battery cell's operating voltage via the voltage test leads.
[0027] It should be noted that the specific structure of the test cabinet is described in relevant technical documents and will not be repeated here.
[0028] Figure 1 This is a schematic diagram of the structure of an electrical connection piece provided for an exemplary embodiment of this application. (See attached diagram.) Figure 1 As shown, the cell testing device may also include an electrical connection piece 100, which may include a first connection part 110 and a second connection part 120. The first connection part 110 is connected to the current test line, the second connection part 120 is connected to the first connection part 110, and the second connection part 120 is connected to the voltage test line.
[0029] In practical applications, the electrical connector 100 can be soldered onto the battery cell. In this way, the first connection part 110 can transmit current between the battery cell and the current test line, realizing the charging and discharging effect of the battery cell, while the voltage test line can collect the voltage signal of the battery cell through the second connection part 120.
[0030] In related technologies, the current test lead is fixed to the first connection part 110 by a clip. This often results in a small contact area between the current test lead and the first connection part 110, leading to a high resistance between them. During testing, since current needs to be transferred between the current test lead and the first connection part 110, a significant amount of heat is generated (due to the high resistance between them). This heat can negatively impact the performance of the battery cell, thus affecting the accuracy of the battery cell performance test results. Furthermore, the heat can also affect the voltage test results, further impacting the accuracy of the battery cell performance test results.
[0031] Therefore, such as Figure 1 As shown in the embodiment of this application, the first connecting part 110 is provided with a connecting hole 130. Correspondingly, the cell testing device may also include a fastener. Specifically, the current test wire is embedded in the connecting hole 130, and the fastener cooperates with the connecting hole 130. The fastener and the first connecting part 110 can press against the current test wire. Under the joint action of the fastener and the first connecting part 110, the current test wire can be fixed on the first connecting part 110.
[0032] It should be noted that the end face area of the fastener used to press against the current test lead is significantly larger than the clamping surface area of the clip used to hold the current test lead. In other words, compared to related technologies that use clips to hold the current test lead, this embodiment utilizes a fastener to press and fix the current test lead, allowing a larger portion of the current test lead to be pressed and fixed onto the first connecting portion 110. This effectively increases the contact area between the current test lead and the first connecting portion 110, reducing the resistance between them. This, in turn, reduces the heat generated during testing, minimizing the impact of heat on the cell's performance and the voltage test lead's detection results, and ultimately improving the accuracy of the final cell performance test results.
[0033] It should be noted that since no current needs to be transmitted between the voltage test line and the second connection part 120, there is no problem of small contact area and increased heat. Therefore, there is no need to machine additional holes on the second connection part 120, nor is it necessary to use fasteners to fix the voltage test line and the second connection part 120.
[0034] In one embodiment, the electrical connector 100 may be made of nickel, copper, aluminum, or other materials.
[0035] In one embodiment, the fastener may include bolts, screws, etc.
[0036] like Figure 1 As shown, a partition groove 140 is provided between the first connecting portion 110 and the second connecting portion 120, which allows the first connecting portion 110 and the second connecting portion 120 to be aligned along a first direction (which can be understood as the width direction of the electrical connecting piece 100, see reference for details). Figure 1 (distributed at intervals along the X-axis).
[0037] It should be noted that after the separator 140 separates the first connection part 110 and the second connection part 120, the heat generated by the first connection part 110 and the current test line during the test is not easily transferred directly to the second connection part 120 and the voltage test line. In other words, the heat influence on the second connection part 120 and the voltage test line can be further reduced, thereby improving the accuracy of the voltage test results.
[0038] like Figure 1 As shown, the first connecting portion 110 may include a body 111 and a protruding end 112, with the body 111 and the second connecting portion 120 along a first direction (reference). Figure 1 The protruding ends 112 are distributed at intervals along the X-axis direction, and are connected to the body 111. The protruding ends 112 are along the second direction (which can be understood as the length direction of the electrical connecting pieces 100, and the second direction is perpendicular to the first direction; see reference for details). Figure 1The protrusion (in the Y-axis direction) protrudes relative to the main body 111 and the second connecting part 120, thus avoiding interference between the protruding end 112 and the second connecting part 120.
[0039] It should be noted that the maximum width of the protruding end 112 along the first direction is greater than the maximum width of the body 111 along the first direction, and the connecting hole 130 is provided on the protruding end 112. In this way, compared with the body 111, the protruding end 112 can provide a larger area to set the connecting hole 130, which is beneficial to setting a connecting hole 130 with a larger diameter.
[0040] It should be understood that by increasing the diameter of the connecting hole 130, the outer diameter of the corresponding fastener increases, and the end face area of the fastener used to press against the current test line increases. Therefore, the fastener can press and fix more of the current test line onto the first connecting part 110. This can effectively increase the contact area between the current test line and the first connecting part 110, reduce the resistance between the current test line and the first connecting part 110, thereby reducing the heat generated during the test, reducing the impact of heat on the performance of the battery cell and the voltage test line test results, and improving the accuracy of the final battery cell performance test results.
[0041] like Figure 1 As shown, in one embodiment, the width of the body 111 along the first direction is equal to the width of the second connecting portion 120 along the first direction, and the length of the body 111 along the second direction is equal to the length of the second connecting portion 120 along the second direction. That is, the body 111 and the second connecting portion 120 are symmetrically arranged about the partition groove 140. In this way, the position of the partition groove 140 can be determined more quickly during the manufacturing process, thereby improving the processing efficiency of the partition groove 140.
[0042] like Figure 1 As shown, in one embodiment, the body 111 has a rectangular structure, and the width of different parts of the body 111 along the first direction (refer to...) Figure 1 The same as the label C) in the figure, which is the maximum width of the body 111 along the first direction.
[0043] like Figure 1 As shown, in one embodiment, the protruding end 112 has a large arc structure (central angle greater than 180°), and the maximum width of the protruding end 112 along the first direction can be understood as the diameter of the protruding end 112 (see reference). Figure 1 (marked D).
[0044] like Figure 1As shown, the width of the dividing groove 140 along the first direction is A. It should be understood that if the width A is too large, the width of the first connecting part 110 and the second connecting part 120 along the first direction will be too small, resulting in lower structural strength, easy deformation, and affecting the accuracy of the test results. If the width A is too small, the heat insulation effect of the dividing groove 140 will be unsatisfactory, and the heat generated between the first connecting part 110 and the current test line will easily affect the second connecting part 120 and the voltage test line, affecting the accuracy of the test results.
[0045] Therefore, in this embodiment of the application, the width A of the partition groove 140 along the first direction satisfies the following condition: 1.5mm ≤ A ≤ 2.5mm. This effectively improves the problems caused by the aforementioned width A being too large or too small.
[0046] In one embodiment, the width A can be selected as 1.5mm, 2mm, 2.5mm, etc.
[0047] like Figure 1 As shown, one end of the separator groove 140 along the second direction penetrates the edge of the electrical connector piece. In this way, on the one hand, the separator groove 140 can completely separate the first connection portion 110 and the second connection portion 120 at one end, reducing the impact of heat generated between the first connection portion 110 and the current test line on the second connection portion 120 and the voltage test line; on the other hand, with the length of the separator groove 140 along the second direction (usually equal to the length of the second connection portion 120 along the second direction) remaining unchanged, the fact that one end of the separator groove 140 along the second direction penetrates the electrical connector piece reduces the amount of space occupied by the other end of the separator groove 140 on the electrical connector piece, reserving more area for the current-carrying portion of the first connection portion 110 and the second connection portion 120 (refer to the fourth connection portion 170 below), reducing the resistance of the current-carrying portion and reducing the generated heat.
[0048] like Figure 1 As shown, the electrical connector 100 may further include a third connector 150, which connects to the first connector 110 and the second connector 120. In practical applications, the third connector 150 is soldered to the battery cell to achieve electrical connection between the third connector 150 and the battery cell. The test cabinet can detect the voltage of the battery cell through the voltage test lines, the second connector 120, and the third connector 150; current can be transferred between the test cabinet and the battery cell through the current test lines, the first connector 110, and the third connector 150.
[0049] like Figure 1As shown, the third connecting part 150 is provided with a heat dissipation groove 160. It should be noted that during the welding process between the third connecting part 150 and the battery cell, heat will be generated between the third connecting part 150 and the battery cell. The heat dissipation groove 160 can provide a heat dissipation area, which can effectively improve heat dissipation efficiency, reduce the welding temperature between the third connecting part 150 and the battery cell, reduce the impact of welding heat on the battery cell, and ensure the performance of the battery cell.
[0050] like Figure 1 As shown, the width of the heat dissipation groove 160 along the first direction is B. It should be understood that if the width B is too large, the solid portion of the third connection part 150 on both sides of the heat dissipation groove 160 will be less, resulting in lower structural strength and affecting the welding strength between the third connection part 150 and the battery cell, making it easy for the third connection part 150 to detach from the battery cell; if the width B is too small, the heat dissipation efficiency will be lower, resulting in a higher welding temperature between the third connection part 150 and the battery cell, affecting the performance of the battery cell.
[0051] Therefore, in this embodiment, the width B of the heat dissipation groove 160 along the first direction satisfies the following condition: 1.5mm ≤ B ≤ 2.5mm. This effectively improves the problems caused by the aforementioned width B being too large or too small.
[0052] In one embodiment, the width B can be selected as 1.5mm, 2mm, 2.5mm, etc.
[0053] like Figure 1 As shown, one end of the heat sink 160 extends through the edge of the electrical connector in the second direction away from the first connecting portion 110 and the second connecting portion 120. In this way, while ensuring heat dissipation efficiency, the other end of the heat sink 160 can occupy less of the other part of the electrical connector, leaving more area for the current-carrying portion of the first connecting portion 110 and the second connecting portion 120 (refer to the fourth connecting portion 170 in the following text), reducing the resistance of the current-carrying portion and reducing the heat generated.
[0054] like Figure 1 As shown, the electrical connector 100 may further include a fourth connector 170, one end of which is connected to the third connector 150, and the other end of which is connected to the first connector 110 (specifically connected to the body 111 in this embodiment) and the second connector 120. During testing, the third connector 150 can transmit electrical signals to the first connector 110 and the second connector 120 through the fourth connector 170.
[0055] It should be noted that the fourth connecting part 170 not only serves to transmit electrical signals, but also does not have slots, holes or other structures. The fourth connecting part 170 can enhance the structural strength between the first connecting part 110, the second connecting part 120 and the third connecting part 150, ensuring that the electrical connecting piece 100 is not easily broken during welding and testing, and extending the service life of the electrical connecting piece 100.
[0056] like Figure 1 As shown, the end of the third connecting portion 150 away from the first connecting portion 110 and the second connecting portion 120 (that is, the end of the third connecting portion 150 away from the fourth connecting portion 170) is provided with an arc-shaped chamfer 180. In this way, during the process of installing the third connecting portion 150 on the battery cell, the arc-shaped chamfer 180 can prevent the third connecting portion 150 from scratching the battery cell, thus protecting the battery cell.
[0057] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.
[0058] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.
[0059] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.
[0060] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.
[0061] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.
Claims
1. A battery cell testing device, characterized in that, include: Test cabinet, including current test leads and voltage test leads; An electrical connector includes a first connecting part and a second connecting part. The first connecting part has a connecting hole, and the current test wire is embedded in the connecting hole. The second connecting part is connected to the first connecting part and the second connecting part is connected to the voltage test wire. A fastener, which mates with the connecting hole, is used to press and fix the current test lead together with the first connecting part.
2. The cell testing device according to claim 1, characterized in that, A partition groove is provided between the first connecting portion and the second connecting portion so that the first connecting portion and the second connecting portion are spaced apart along a first direction; wherein, the first direction represents the width direction of the electrical connecting piece.
3. The cell testing device according to claim 2, characterized in that, The first connecting part includes: The main body and the second connecting portion are spaced apart along the first direction; A protruding end is connected to the body. The protruding end protrudes relative to the body and the second connecting portion along a second direction. The maximum width of the protruding end along the first direction is greater than the maximum width of the body along the first direction. The connecting hole is provided on the protruding end. The second direction represents the length direction of the electrical connecting piece, and the second direction is perpendicular to the first direction.
4. The cell testing device according to claim 2, characterized in that, One end of the partition groove extends through the edge of the electrical connector along the second direction; wherein, the second direction represents the length direction of the electrical connector, and the second direction is perpendicular to the first direction.
5. The cell testing device according to claim 2, characterized in that, The width of the dividing groove along the first direction is A, and A satisfies: 1.5mm≤A≤2.5mm.
6. The cell testing apparatus according to any one of claims 1 to 5, characterized in that, The electrical connector also includes: The third connecting part connects the first connecting part and the second connecting part, and the third connecting part is provided with a heat dissipation groove.
7. The cell testing apparatus according to claim 6, characterized in that, The heat dissipation groove extends through the edge of the electrical connection piece in a direction away from the first connection portion and the second connection portion at one end along the second direction.
8. The cell testing apparatus according to claim 6, characterized in that, The electrical connector also includes: The fourth connecting part has one end connected to the third connecting part and the other end connected to the first connecting part and the second connecting part.
9. The cell testing apparatus according to claim 6, characterized in that, The width of the heat dissipation groove along the first direction is B, and B satisfies: 1.5mm≤B≤2.5mm; wherein, the first direction represents the width direction of the electrical connection piece.
10. The cell testing apparatus according to claim 6, characterized in that, The third connecting portion has an arc-shaped chamfer at the end away from the first connecting portion and the second connecting portion.