Battery expansion force testing device and uniformly expandable battery

Abstract

The utility model discloses a battery expansion force testing device, and belongs to the technical field of batteries. Comprising a clamp which is provided with an accommodating cavity for placing a battery; a measuring rod of each digital display dial indicator is inserted from the clamp until the measuring rod abuts against the surface of the battery, the digital display dial indicators are in contact with different point positions on the surface of the battery respectively, and whether the battery expands uniformly or not and whether the expansion amount exceeds an expansion threshold value or not are judged by detecting the expansion amount of the different point positions on the surface of the battery. The utility model also discloses a battery capable of uniformly expanding, which comprises a battery shell, the battery shell is provided with a battery cavity, one outer wall of the battery shell in the thickness direction of a battery roll core is an outer wall to be measured, the corners of the outer wall to be measured close to the two sides are provided with arc-shaped walls which are sunken towards the direction of the battery cavity, and when the battery roll core expands, the arc-shaped walls are arranged on the outer wall to be measured. The arc-shaped wall can absorb about 10% of the cell swelling capacity of the battery roll core, so that the swelling of the battery roll core is not restrained by the corner, and the swelling is more uniform.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to a battery expansion force testing device and a battery capable of uniform expansion. Background Art

[0002] After a certain degree of charge and discharge, the battery will expand. The expansion of the battery will affect the cycle life of the battery. Severe battery expansion will cause battery leakage and combustion, which may cause the explosion of the entire vehicle and even cause casualties.

[0003] In the existing battery expansion force test, generally, a fixture is used to clamp the battery, and a pressure sensor is built in the fixture clamping plate. After the battery expands during charge and discharge, it will exert a force on the clamping plate. The pressure sensor measures the magnitude and change of the battery expansion force by detecting the force received by the clamping plate. However, this test technology cannot effectively detect whether the magnitude of the battery expansion amount exceeds the expansion threshold, and its structure is relatively complex, with many components and high costs.

[0004] In addition, the existing battery case is generally formed by aluminum extrusion, and the corners of the case are rounded. The battery is restricted by the rounded corners of the battery case, resulting in uneven expansion and reduced battery cycle life. Summary of the Utility Model

[0005] The utility model aims at the above problems existing in the prior art, and provides a battery expansion force testing device capable of effectively monitoring the magnitude of the battery expansion amount, and also provides a battery capable of uniform expansion.

[0006] The utility model can be realized by the following technical solutions:

[0007] A battery expansion force testing device, characterized by comprising:

[0008] A fixture having a receiving cavity for placing the battery;

[0009] A digital display dial indicator, the measuring rod of which is inserted into the fixture until it abuts against the battery surface. The digital display dial indicator amplifies the minute expansion change of the battery through an internal gear transmission system and displays the magnitude of the expansion amount on an electronic display screen. Among them,

[0010] The number of the digital display dial indicators is set to be multiple and they are respectively in contact with different points on the battery surface. By detecting the magnitude of the expansion amount at different points on the battery surface, it is judged whether the battery expands uniformly and whether the magnitude of the expansion amount exceeds the expansion threshold.

[0011] As a further improvement of the utility model, the fixture includes an upper clamping plate, a lower clamping plate, a first limiting block and a second limiting block. Among them,

[0012] The first limiting block and the second limiting block are symmetrically arranged on the lower clamping plate. At this time, the reserved space between the first limiting block and the second limiting block forms the accommodating cavity;

[0013] The upper clamping plate and the lower clamping plate are arranged corresponding to each other up and down and are connected by fasteners. After connection, the upper clamping plate covers the accommodating cavity.

[0014] As a further improvement of the present invention, after the upper clamping plate and the lower clamping plate are connected, the distance between the upper clamping plate and the lower clamping plate is greater than the thickness of the battery, so that a gap is reserved between the upper clamping plate and the battery surface.

[0015] As a further improvement of the present invention, it further includes a hand-tightening screw. At the same time, a screw hole is opened in the first limiting block or the second limiting block, and the hand-tightening screw is inserted along the screw hole until it abuts against the side surface of the battery.

[0016] As a further improvement of the present invention, avoidance spaces are provided on both sides of the upper clamping plate and the lower clamping plate, and the avoidance spaces are located at the positions of the first limiting block and the second limiting block.

[0017] As a further improvement of the present invention, the upper clamping plate is provided with a plurality of through-threaded holes, and the measuring rods of each digital display dial indicator are inserted along the threaded holes of the upper clamping plate until they abut against the battery surface.

[0018] As a further improvement of the present invention, a threaded sleeve is fixed on the measuring rod of the digital display dial indicator by interference fit, and the measuring rod is screwed and fixed with the threaded hole of the upper clamping plate through the threaded sleeve.

[0019] A battery that can expand uniformly, which is used to be placed in the above-mentioned battery expansion force test device, includes:

[0020] A battery case, which has a battery cavity that runs through in the length direction, and the battery cavity is used to place a battery core. Among them,

[0021] One outer wall of the battery case in the thickness direction of the battery core is an outer wall to be measured, and arc-shaped walls that are recessed toward the direction of the battery cavity are provided at the corners near both sides of the outer wall to be measured.

[0022] As a further improvement of the present invention, after the battery is placed in the accommodating cavity of the fixture, the arc-shaped wall faces the upper clamping plate, and the measuring rod of the digital display dial indicator is inserted along the threaded hole of the upper clamping plate and abuts against the outer wall to be measured.

[0023] As a further improvement of the present utility model, an explosion-proof valve is provided on the battery housing, and a positive top cover assembly and a negative top cover assembly are installed at both ends of the battery core.

[0024] Compared with the prior art, the present utility model has the following beneficial effects:

[0025] 1. Uniform expansion detection: By setting multiple digital display dial indicators, the expansion amounts at different points on the battery surface can be detected simultaneously. This not only improves the comprehensiveness of the detection but also allows the evaluation of the uniform expansion of the battery by comparing the expansion amounts at each point, ensuring that the expansion of the battery is consistent across the entire surface and effectively detecting whether the expansion amount of the battery exceeds the expansion threshold.

[0026] 2. Real-time monitoring and intuitive display: The electronic display screen of each digital display dial indicator can display the expansion amount in real time, enabling technicians to immediately obtain the data on the battery expansion state without waiting for long-term data processing or analysis, thus improving work efficiency.

[0027] 3. Improvement of detection accuracy and reliability: The digital display dial indicator amplifies the minute expansion changes of the battery through an internal gear transmission system. This highly sensitive design enables the device to capture subtle expansion changes, thereby improving the detection accuracy and reliability.

[0028] 4. Cost-effectiveness: Compared with traditional testing methods, the device of the present utility model has a more compact and simple structure, reduces unnecessary components, lowers the manufacturing cost, and is more convenient and fast to maintain.

[0029] 5. Uniformly expandable battery: One of the outer walls of the battery housing in the thickness direction of the battery core is the outer wall to be measured. Arc-shaped walls that are recessed towards the direction of the battery cavity are provided at the corners near both sides of the outer wall to be measured. The setting of the arc-shaped walls causes the middle part of the outer wall to be measured to protrude towards the battery cavity. At this time, a force buffer zone is formed at the location of the arc-shaped walls. When the battery core expands, it can absorb about 10% of the core expansion amount of the battery core, enabling the expansion of the battery core to be unrestricted by the corners and making the expansion more uniform. Description of the Drawings

[0030] Figure 1 is a schematic structural diagram of the battery expansion force testing device of the present utility model;

[0031] Figure 2 is an exploded view of the battery expansion force testing device of the present utility model;

[0032] Figure 3 is a cross-sectional view of the battery expansion force testing device of the present utility model;

[0033] Figure 4It is a schematic structural diagram of the digital display dial indicator of the present utility model;

[0034] Figure 5 It is a schematic structural diagram of the battery case of the present utility model;

[0035] Figure 6 It is a front view of the battery case of the present utility model;

[0036] Figure 7 It is an explosion schematic diagram of the battery of the present utility model.

[0037] In the figure, 100 is a fixture; 110 is an upper clamping plate; 120 is a lower clamping plate; 130 is a first limit block; 140 is a second limit block; 150 is a gap; 160 is a hand-tightening screw; 170 is an avoidance space;

[0038] 200 is a digital display dial indicator; 210 is an electronic display screen; 220 is a measuring rod; 230 is a threaded sleeve;

[0039] 300 is a battery; 310 is a battery case; 311 is an outer wall to be measured; 312 is an arc wall; 313 is an explosion-proof valve; 320 is a battery core roll; 340 is a positive pole top cover assembly; 350 is a negative pole top cover assembly. Detailed implementation manners

[0040] The following are specific embodiments of the present utility model and in conjunction with the accompanying drawings, the technical methods of the present utility model are further described, but the present utility model is not limited to these embodiments.

[0041] As Figures 1-7 shown, the present utility model provides a battery expansion force testing device, including:

[0042] A fixture 100, which has a receiving cavity for placing the battery 300;

[0043] A digital display dial indicator 200, whose measuring rod 220 is inserted into the fixture 100 until it abuts against the surface of the battery 300. The digital display dial indicator 200 amplifies the minute expansion change of the battery 300 through an internal gear transmission system and displays the magnitude of the expansion amount on the electronic display screen 210. Among them,

[0044] The number of digital display dial indicators 200 is set to be multiple and they are respectively in contact with different points on the surface of the battery 300. By detecting the magnitudes of the expansion amounts at different points on the surface of the battery 300, it is judged whether the battery 300 expands uniformly and whether the magnitude of the expansion amount exceeds the expansion threshold.

[0045] It should be noted that the judgment basis for whether the battery 300 expands uniformly is: if the magnitudes of the expansion amounts at multiple points of the battery core are the same, then the battery 300 expands uniformly. The battery 300 expansion force testing device provided in this embodiment has at least the following advantages:

[0046] 1. Uniform expansion detection: By setting multiple digital display dial indicators 200, the expansion amounts at different points on the surface of the battery 300 can be detected simultaneously. This not only improves the comprehensiveness of the detection but also allows for the evaluation of the uniform expansion of the battery 300 by comparing the expansion amounts at various points, ensuring that the expansion of the battery 300 is consistent across the entire surface and effectively detecting whether the expansion amount of the battery 300 exceeds the expansion threshold.

[0047] 2. Real-time monitoring and intuitive display: The electronic display screen 210 of each digital display dial indicator 200 can display the expansion amount in real time, enabling technicians to immediately obtain data on the expansion state of the battery 300 without waiting for long-term data processing or analysis, thus improving work efficiency.

[0048] 3. Improving detection accuracy and reliability: The digital display dial indicator 200 amplifies the minute expansion changes of the battery 300 through an internal gear transmission system. This highly sensitive design enables the device to capture subtle expansion changes, thereby improving the detection accuracy and reliability.

[0049] 4. Cost-effectiveness: Compared with traditional testing methods, the device of the present utility model has a more compact and simple structure, reduces unnecessary components, lowers manufacturing costs, and is more convenient and faster to maintain.

[0050] Preferably, the fixture 100 includes an upper clamping plate 110, a lower clamping plate 120, a first limiting block 130, and a second limiting block 140. Among them,

[0051] The first limiting block 130 and the second limiting block 140 are symmetrically arranged on the lower clamping plate 120. At this time, the reserved space between the first limiting block 130 and the second limiting block 140 forms a receiving cavity. After the battery 300 is placed in the receiving cavity, the first limiting block 130 and the second limiting block 140 limit both sides of the battery 300.

[0052] The upper clamping plate 110 and the lower clamping plate 120 are arranged corresponding to each other up and down and are connected by fasteners. After connection, the upper clamping plate 110 covers the receiving cavity, and at this time, the battery 300 has completed preliminary positioning.

[0053] It is worth mentioning that after the upper clamping plate 110 and the lower clamping plate 120 are connected, the distance between the upper clamping plate 110 and the lower clamping plate 120 is slightly greater than the thickness of the battery 300, so as to leave a gap 150 between the upper clamping plate 110 and the surface of the battery 300, thereby reserving space for the expansion of the battery 300 and ensuring the smooth progress of the test.

[0054] Preferably, it further includes a hand-twist screw 160. At the same time, a screw hole is provided in the first limit block 130 or the second limit block 140. The hand-twist screw 160 is inserted along the screw hole until it abuts against the side surface of the battery 300, thereby preventing the battery 300 from moving during the expansion force test, and further ensuring the accuracy of the test result.

[0055] Further, avoidance spaces 170 are provided on both sides of the upper clamping plate 110 and the lower clamping plate 120. The avoidance spaces 170 are located at the positions of the first limit block 130 and the second limit block 140. That is, the avoidance spaces 170 are provided to facilitate the operator to twist the hand-twist screw 160.

[0056] Preferably, the upper clamping plate 110 is provided with a plurality of through-threaded holes. The measuring rods 220 of the digital display dial indicators 200 are inserted along the threaded holes of the upper clamping plate 110 until they abut against the surface of the battery 300. Among them, a threaded sleeve 230 is fixed on the measuring rod 220 of the digital display dial indicator 200 by interference fit. The measuring rod 220 is screwed and fixed to the threaded hole of the upper clamping plate 110 through the threaded sleeve 230, ensuring that the digital display dial indicator 200 will not be displaced during the expansion of the battery 300, and further ensuring the accuracy of the test result.

[0057] There is also provided a battery 300 that can expand uniformly, which is used to be placed in the above-mentioned battery 300 expansion force test device, and includes:

[0058] A battery housing 310, which has a battery cavity that penetrates along the length direction. The battery cavity is used to place the battery core 320. Among them,

[0059] One outer wall of the battery housing 310 in the thickness direction of the battery core 320 is the outer wall 311 to be measured. Arc-shaped walls 312 that are recessed toward the direction of the battery cavity are provided at the corners near both sides of the outer wall 311 to be measured. At this time, the entire battery housing 310 forms an approximately rectangular structure.

[0060] Specifically, the setting of the arc-shaped wall 312 makes the middle part of the outer wall 311 to be measured protrude toward the battery cavity. At this time, a force buffer area is formed at the position of the arc-shaped wall 312. When the battery core 320 expands, it can absorb about 10% of the expansion amount of the battery core of the battery core 320, so that the expansion of the battery core 320 is not restricted by the corners and the expansion is more uniform.

[0061] Preferably, when the battery 300 is placed in the accommodation cavity of the fixture 100, the arc-shaped wall 312 faces the upper clamping plate 110, and the measuring rod 220 of the digital display dial indicator 200 is inserted along the threaded hole of the upper clamping plate 110 and abuts against the outer wall 311 to be measured.

[0062] Preferably, an explosion-proof valve 313 is provided on the battery case 310, and a positive top cover assembly 340 and a negative top cover assembly 350 are installed at both ends of the battery core 320. Among them, the explosion-proof valve 313 is fixed on the battery case 310 by laser welding, and the position where the explosion-proof valve 313 is located is a weak area of the battery case 310. When the pressure reaches a certain value, the explosion-proof valve 313 automatically opens to relieve pressure, preventing the battery 300 from exploding.

[0063] The technical means disclosed in the solution of the present utility model are not limited to the technical means disclosed by the above technical means, but also include technical solutions composed of any combination of the above technical features. The above is the specific implementation manner of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and retouches can be made, and these improvements and retouches are also regarded as the protection scope of the present utility model.

[0064] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0065] In addition, in the present utility model, descriptions such as "first", "second", and "one" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0066] In the present utility model, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0067] In addition, the technical solutions between the various embodiments of the present utility model can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

Claims

1. A battery expansion force testing device, characterized in that, Comprising: A fixture having a receiving cavity for placing a battery; A digital display dial indicator, the measuring rod of which is inserted from the fixture until it abuts against the surface of the battery. The digital display dial indicator amplifies the minute expansion change of the battery through an internal gear transmission system and displays the magnitude of the expansion on an electronic display screen. Among them, The number of the digital display dial indicators is set to be multiple and they are respectively in contact with different points on the surface of the battery. By detecting the magnitudes of the expansions at different points on the surface of the battery, it is determined whether the battery expands uniformly and whether the magnitude of the expansion exceeds the expansion threshold.

2. The battery expansion force testing device according to claim 1, characterized in that, The fixture includes an upper clamping plate, a lower clamping plate, a first limiting block, and a second limiting block. Among them, The first limiting block and the second limiting block are symmetrically arranged on the lower clamping plate. At this time, the reserved space between the first limiting block and the second limiting block forms the receiving cavity; The upper clamping plate and the lower clamping plate are arranged corresponding to each other up and down and are connected by fasteners. After connection, the upper clamping plate covers the receiving cavity.

3. The battery swelling force testing device according to claim 2, wherein, When the upper clamping plate and the lower clamping plate are connected, the distance between the upper clamping plate and the lower clamping plate is greater than the thickness of the battery, so that a gap is reserved between the upper clamping plate and the surface of the battery.

4. A battery expansion force testing device according to claim 2, wherein, It further includes a hand-tightening screw. At the same time, a threaded hole is provided in the first limiting block or the second limiting block, and the hand-tightening screw is inserted along the threaded hole until it abuts against the side surface of the battery.

5. The battery swelling force testing device according to claim 3, wherein, When avoidance spaces are provided on both sides of the upper clamping plate and the lower clamping plate, the avoidance spaces are located at the positions of the first limiting block and the second limiting block.

6. The battery expansion force testing device according to claim 2, wherein The upper clamping plate is provided with a plurality of through-threaded holes, and the measuring rods of the respective digital display dial indicators are inserted along the respective threaded holes of the upper clamping plate until they abut against the surface of the battery.

7. The battery expansion force testing device according to claim 6, wherein, A threaded sleeve is fixed on the measuring rod of the digital display dial indicator by interference fit, and the measuring rod is screwed and fixed to the threaded hole of the upper clamping plate through the threaded sleeve.

8. A uniformly expandable battery, which is used to be placed in the battery expansion force test device according to any one of claims 1-7, and is characterized in that, Comprising: A battery housing having a battery cavity that penetrates along the length direction, and the battery cavity is used for placing a battery core. Among them, One of the outer walls of the battery housing in the thickness direction of the battery core is an outer wall to be measured, and arc-shaped walls that are recessed toward the direction of the battery cavity are provided at the corners near both sides of the outer wall to be measured.

9. A uniformly expandable battery according to claim 8, characterized in that, When the battery is placed in the receiving cavity of the fixture, the arc-shaped wall faces the upper clamping plate, and the measuring rod of the digital display dial indicator is inserted along the threaded hole of the upper clamping plate and abuts against the outer wall to be measured.

10. A uniformly expandable battery according to claim 8, characterized in that, An explosion-proof valve is provided on the battery housing, and a positive terminal cover assembly and a negative terminal cover assembly are installed at both ends of the battery core.

Images