Battery expansion simulation device

Abstract

The utility model discloses a battery expansion simulation device, and relates to the field of battery engineering, the battery expansion simulation device comprises a deformation assembly, the deformation assembly comprises a battery shell and two mobile flat plates arranged at intervals along the thickness direction of the battery shell, and the mobile flat plates are provided with pressure sensors; the expansion assembly is located between the two movable flat plates and comprises a power source unit and an axial displacement rod unit which is located at the output end of the power source unit and can move in the length direction of the battery shell; the axial displacement rod unit is provided with a multi-connecting-rod unit used for driving the two movable flat plates to be close to or away from each other according to displacement of the axial displacement rod unit. By adjusting the action of the power source unit and the pressure applied to the battery shell, the expansion speed and expansion strength of the battery in different states can be simulated, so that the battery can be better optimized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of battery engineering, concretely relates to a battery expansion simulation device. BACKGROUND

[0002] Secondary batteries have been widely used in many fields such as consumer electronics, electric vehicles, and energy storage systems due to their high energy density, long cycle life, and low maintenance requirements. However, the safety of secondary batteries is an important consideration factor in their application.

[0003] When the battery is charging and discharging, the internal chemical reaction will cause heat generation, which is called thermal effect. Excessive temperature will cause the thermal stability of the battery material to decrease, thereby affecting the performance and safety of the battery. In addition, electrochemical reactions can also cause changes in the internal structure of the battery, such as the volume expansion of the negative electrode material. In actual use, the expansion force generated by the expansion of the battery will exert a large stress on the internal structural components of the battery, and in severe cases, it may even cause irreversible structural damage, reducing the safety of the battery.

[0004] Currently on the market, there are obvious deficiencies in the testing equipment and technical means for the expansion force of secondary batteries. Traditional testing methods are mostly limited to monitoring the change in the external dimensions of the battery, and cannot accurately capture and quantify the distribution and change of the internal expansion force of the battery, which undoubtedly brings great challenges to the optimization design of the safety performance of the battery. SUMMARY

[0005] The present application provides a battery expansion simulation device, which can solve the technical problem that the existing battery expansion force testing method can only measure the change in the external dimensions of the battery, cannot accurately reflect the expansion force of the battery under various conditions, and cannot well perform internal optimization work of the battery.

[0006] The present application provides a battery expansion simulation device, which comprises:

[0007] The deformation assembly comprises a battery shell and two moving plates spaced along the thickness direction of the battery shell, and the moving plates are provided with pressure sensors;

[0008] The expansion assembly located between the two moving plates comprises a power source unit, an axial displacement rod unit located at the output end of the power source unit and capable of displacing along the length direction of the battery shell, and a multi-link unit provided on the axial displacement rod unit for driving the two moving plates to approach or move away from each other according to the displacement of the axial displacement rod unit.

[0009] In an embodiment, a fixing frame is provided in the battery shell for supporting the axial displacement rod unit and the multi-link unit.

[0010] In an embodiment, the power source unit comprises a control box for receiving the pressure sensor pressure value, and a motor for receiving the control box dispatch.

[0011] In an embodiment, a reduction gearbox is arranged between the motor rotating end and the axial displacement rod unit.

[0012] In an embodiment, the axial displacement rod unit comprises a transmission screw rod connected to the motor rotating end, and a threaded slider sleeved on the transmission screw rod.

[0013] In an embodiment, the transmission screw rod is provided with a screw rod fixing seat at the end away from the power source unit for bearing the free end of the transmission screw rod.

[0014] In an embodiment, the surface of the screw rod fixing seat is provided with a lower groove matched with the shape of the free end of the transmission screw rod.

[0015] In an embodiment, the top of the screw rod fixing seat is provided with a fixing seat upper cover.

[0016] In an embodiment, the multi-link unit comprises two hinge rods arranged opposite along the thickness direction of the battery shell.

[0017] In an embodiment, the hinge rod comprises a first short rod having one end hinged to the inner wall of the moving plate, a second short rod having one end hinged to the screw rod fixing seat, and a third short rod having one end hinged to the threaded slider, and the free ends of the first, second and third short rods are gathered and hinged.

[0018] The technical scheme provided by the embodiments of the present application has the following beneficial effects:

[0019] By arranging the power source unit, the axial displacement rod unit, and the multi-link unit capable of adjusting the expansion speed, the movement of the multi-link unit can force the battery shell to deform, simulate the expansion force of the battery in different states, help researchers and engineers better understand the influence of the expansion behavior of the battery on the battery pack structure, and thus optimize the battery pack design and improve the safety and reliability of the battery and the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 The structural explosion view of the battery expansion simulation device provided by the embodiment of the present application is shown in the figure.

[0022] Figure 2 The structural explosion view of the battery expansion simulation device provided by the embodiment of the present application is shown in the figure.

[0023] Figure 3 The structural explosion view of the battery expansion simulation device provided by the embodiment of the present application is shown in the figure.

[0024] In the figure: 1, battery shell; 101, fixed frame; 102, battery top cover; 2, moving flat plate; 201, pressure sensor; 3, power source unit; 301, control box; 302, motor; 303, speed reducer; 304, power supply battery; 4, axial displacement rod unit; 401, transmission screw; 402, threaded sliding block; 5, multi-link unit; 501, first short rod; 502, second short rod; 503, third short rod; 6, screw fixing seat; 601, lower groove; 602, fixing seat upper cover. DETAILED DESCRIPTION

[0025] In order to make the person skilled in the art better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor fall within the scope of protection of the present application.

[0026] The embodiment of the present application provides a battery expansion simulation device, which can solve the technical problem that the existing battery expansion force test method can only measure the external size change of the battery, cannot accurately reflect the expansion force of the battery in various states, and cannot well perform the internal optimization work of the battery.

[0027] Figure 1 The structural explosion view of the battery expansion simulation device provided by the embodiment of the present application is shown in the figure. Figure 1 As shown in the figure, the battery expansion simulation device in the present application includes a deformation assembly and an expansion assembly located inside the deformation assembly. The expansion assembly can push or pull back the deformation assembly in the thickness direction of the deformation assembly under the action of the structure to make the deformation assembly deform, so as to simulate the process of battery expansion.

[0028] Specifically, the deformation assembly includes a battery shell 1 and two moving flat plates 2 arranged along the thickness direction of the battery shell 1. The moving flat plate 2 is provided with a pressure sensor 201.

[0029] First of all, it needs to be pointed out that the battery shell 1 is a cuboid, in the same plane, the long side of the battery shell is the length direction of the battery shell 1, and the short side of the battery shell 1 is the thickness direction of the battery shell 1, and the subsequent will not be repeated, the top of the battery shell 1 is provided with a battery top cover 102, the mobile flat plate 2 and the expansion assembly are arranged in the sealed space formed by the battery shell 1 and the battery top cover 102, the mobile flat plate 2 is movably arranged, and can be translated along the thickness direction of the battery shell 1 under the power action of the expansion assembly. At the same time, the expansion assembly is electrically connected with the pressure sensor 201, when the pressure is applied to the pressure sensor 201, the expansion assembly starts to act, pushes the mobile flat plate 2 to force the battery shell 1 to deform.

[0030] Further, the expansion assembly is located between the two mobile flat plates 2, the expansion assembly includes a power source unit 3, and an axial displacement rod unit 4 located at the output end of the power source unit 3 and can be displaced along the length direction of the battery shell 1, the axial displacement rod unit 4 is provided with a plurality of link units 5 for driving the two mobile flat plates 2 to approach or move away from each other according to the displacement of the axial displacement rod unit 4. Among them, the power source unit 3 can act according to the pressure state of the pressure sensor 201 and can adjust the power size.

[0031] When a certain pressure is applied to the battery shell 1, the pressure sensor 201 is pressed, the power source unit 3 starts to act and drives the axial displacement rod unit 4 to start to displace in the direction away from the power source unit 3, based on the structure effect, under the driving of the axial displacement rod unit 4, the multi-link unit 5 starts to diffuse along the thickness direction of the battery shell 1, and drives the mobile flat plate 2 to act to transmit the diffusion force to the battery shell 1, forcing the battery shell 1 to deform, thus, the simulation process is completed, at the same time, since the expansion force will also change under different states of the battery (for example, the charge and discharge state of the battery, temperature, battery type and applied external pressure, etc.), therefore, the power of the power source unit 3 is adjustable, which can control the movement speed of the multi-link unit 5, combined with the different pressures applied to the battery shell 1, to simulate the expansion speed and expansion degree of the battery under different states.

[0032] Further, the battery shell 1 is provided with a fixed frame 101 for supporting the axial displacement rod unit 4 and the multi-link unit 5, in an embodiment of the present application, the fixed frame 101 includes a partition plate to divide the internal space of the battery shell 1 into two parts, in an embodiment of the present application, the axial displacement rod unit 4 and the multi-link unit 5 are arranged on the upper surface of the fixed frame 101, and part of the structure of the power source unit 3 is arranged below the fixed frame 101 and connected with the bottom of the battery shell 1, under the premise of ensuring the normal movement of the axial displacement rod unit 4 and the multi-link unit 5, the specific arrangement manner is not limited in the present application.

[0033] Further,Figure 2 The power source unit 3 and the axial displacement rod unit 4 structure schematic diagram of the battery expansion simulation device provided by the embodiment of the application are shown in the figure. Figure 2 As shown, the power source unit 3 includes a control box 301 for receiving the pressure sensor 201 pressure value, and a motor 302 for accepting the control box 301 scheduling, and the motor 302 rotating end is provided with a reduction box 303 between the axial displacement rod unit 4.

[0034] The rotating end of the motor 302 is connected with the reduction box 303 and the axial displacement rod unit 4 in turn, and after the control box 301 receives the pressure state of the pressure sensor 201, the motor 302 is controlled to start, driving the axial displacement rod unit 4 to move towards the direction away from the motor 302, combining the battery expansion force curve, the motor 302 rotating speed is adjusted through the control box 301 and the reduction box 303, the displacement speed of the axial displacement rod unit 4 and the expansion speed of the multi-link unit 5, which can simulate the expansion speed of the battery in different states.

[0035] Further, the power source unit 3 further includes a power supply battery 304 for providing power for the control box 301 and the motor 302, and the setting position and capacity of the power supply battery 304 are not specifically limited in the application.

[0036] Further, the axial displacement rod unit 4 includes a transmission screw rod 401 connected to one end of the motor 302 rotating end, the transmission screw rod 401 is provided with a threaded slider 402 engaged with the transmission screw rod 401 on the outer periphery, when the motor 302 rotating end rotates, the torque of the motor 302 is amplified through the reduction box 303, the transmission screw rod 401 starts to rotate in place, the threaded slider 402 is engaged with the transmission screw rod 401 rod body, and under the action of the gear, the threaded slider 402 starts to displace towards the direction away from the motor 302.

[0037] Further, the end of the transmission screw rod 401 away from the power source unit 3 is provided with a screw rod fixing seat 6 for bearing the free end of the transmission screw rod 401, and the top of the screw rod fixing seat 6 is provided with a fixing seat upper cover 602.

[0038] According to the above description, one end of the transmission screw rod 401 is connected to the rotating end of the motor 302, and the other end is in a suspended state, therefore, the screw rod fixing seat 6 can bear the free end of the transmission screw rod 401, preventing the transmission screw rod 401 from collapsing, the fixing seat upper cover 602 is detachably connected with the screw rod fixing seat 6, so as to improve the anti-interference of the internal structure of the battery expansion simulation device, and since the transmission screw rod 401 will rotate in the simulation experiment process, the surface of the screw rod fixing seat 6 is provided with a lower groove 601 matched with the form of the free end of the transmission screw rod 401, the free end of the transmission screw rod 401 is embedded in the lower groove 601 and rotates in the lower groove 601.

[0039] In one embodiment of the present application, the free end of the transmission screw 401 is provided with a circular truncated cone with a diameter larger than that of the transmission screw 401, the lower groove 601 is semicircular, and the circular truncated cone is always half of its volume in the lower groove 601, preventing the transmission screw 401 from coming out during rotation.

[0040] Further, Figure 3 The top view of the battery swelling simulation device provided in the embodiment of the present application is shown in Figure 3 As shown, the multi-link unit 5 includes two hinge rods arranged opposite along the thickness direction of the battery shell 1, and the two hinge rods are arranged opposite and move synchronously. The hinge rods include a first short rod 501 with one end hinged to the inner wall of the moving plate 2, a second short rod 502 with one end hinged to the screw fixed seat 6, and a third short rod 503 with one end hinged to the threaded slider 402. The free ends of the first short rod 501, the second short rod 502, and the third short rod 503 are gathered and hinged.

[0041] Both ends of the first short rod 501, the second short rod 502, and the third short rod 503 are provided with connecting holes, and the corresponding positions of the inner wall of the moving plate 2 are provided with hinge ends. The lengths of the first short rod 501, the second short rod 502, and the third short rod 503 are equal. For convenience of description, the first short rod 501 and the second short rod 502 can be regarded as a long rod that can be bent, one end of which is hinged to the hinge end of the inner wall of the moving plate 2, and the other end is hinged to the screw fixed seat 6. One end of the third short rod 503 is hinged to the center bending area of the long rod, and the other end is hinged to the threaded slider 402. This structure can also prevent the threaded slider 402 from rotating with the transmission screw 401. When the motor 302 rotates, the threaded slider 402 moves towards the screw fixed seat 6, and the third short rod 503 pushes the long rod to bend towards the moving plate 2 to push the moving plate 2 to press the battery shell 1.

[0042] As an optional embodiment, grooves are provided on both sides of the screw fixed seat 6, one end of the second short rod 502 is embedded in the groove, and a rotating shaft is longitudinally arranged in the groove, penetrating the second short rod 502 to realize the hinge connection between the screw fixed seat 6 and the second short rod 502.

[0043] The mechanism of the battery swelling simulation device in the present application is as follows: other terminal devices determine the battery swelling data to be simulated, and then transmit the battery swelling data to be simulated to the control box 301, and the control box 301 controls the motor 302 to simulate the battery swelling force of the battery at different states of charge and different cycle life. Specifically, the control box 301 controls the motor 302 to rotate, the transmission screw rod 401 starts to rotate with the rotating end of the motor 302, the threaded slide block 402 starts to move towards the direction close to the screw rod fixed seat 6, the multi-link unit 5 spreads towards the thickness direction of the battery shell 1 to push the moving plate 2 to extrude the battery shell 1, and the pressure sensor 201 collected by the battery shell 1 is fed back to the control box to control the power of the power source unit 3. Through the structure, the swelling force and swelling speed of the battery under different working conditions can be simulated, which helps researchers and engineers better understand the swelling behavior of the battery, so as to optimize the battery pack design, improve the safety and reliability of the battery and the battery pack, and facilitate the optimization of the battery interior.

[0044] In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, and it can be the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] It should be noted that in the present application, relational terms such as "first" and "second" and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the sentence "including a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0046] The foregoing detailed description of the application has been presented for purposes of illustration and description. Various modifications and changes can be made to these embodiments without departing from the spirit and scope of the application. It is intended that the scope of the application should not be limited by the particular representative embodiments described above.

Claims

1. A battery swelling simulation apparatus, characterized by, The application relates to a battery deformation device. The battery deformation device comprises a battery shell (1) and two moving plates (2) arranged along the thickness direction of the battery shell (1), wherein a pressure sensor (201) is arranged on the moving plates (2). An expansion assembly is arranged between the two moving plates (2), and the expansion assembly comprises a power source unit (3) and an axial displacement rod unit (4) arranged at the output end of the power source unit (3) and capable of moving along the length direction of the battery shell (1), wherein a multi-link unit is arranged on the axial displacement rod unit (4) and used for driving the two moving plates (2) to move close to or away from each other according to the displacement of the axial displacement rod unit (4).

2. A battery swelling simulation device as claimed in claim 1, characterized in that A fixing frame (101) is arranged in the battery shell (1) and used for supporting the axial displacement rod unit (4) and the multi-link unit (5).

3. A battery swelling simulation apparatus according to claim 1, wherein The power source unit (3) comprises a control box (301) used for receiving the pressure value of the pressure sensor (201) and a motor (302) used for receiving the scheduling of the control box (301).

4. A battery swelling simulation apparatus according to claim 3, wherein A speed reducer (303) is arranged between the rotating end of the motor (302) and the axial displacement rod unit (4).

5. A battery swelling simulation apparatus according to claim 3, wherein The axial displacement rod unit (4) comprises a transmission screw (401) connected to the rotating end of the motor (302), and a threaded slider (402) is arranged on the outer periphery of the transmission screw (401) and engaged with the transmission screw (401).

6. A battery swelling simulation apparatus according to claim 5, wherein A screw fixing base (6) is arranged at the end of the transmission screw (401) away from the power source unit (3) and used for bearing the free end of the transmission screw (401).

7. A battery swelling simulation apparatus according to claim 6, wherein A lower groove (601) is arranged on the surface of the screw fixing base (6) and matched with the shape of the free end of the transmission screw (401).

8. A battery swelling simulation apparatus according to claim 7, wherein A fixing base upper cover (602) is arranged on the top of the screw fixing base (6).

9. A battery swelling simulation apparatus according to claim 6, wherein The multi-link unit (5) comprises two hinge rods arranged opposite to each other along the thickness direction of the battery shell (1).

10. A battery swelling simulation apparatus according to claim 9, wherein The hinge rods comprise a first short rod (501) hingedly connected to the inner wall of the moving plate (2), a second short rod (502) hingedly connected to the screw fixing base (6) and a third short rod (503) hingedly connected to the threaded slider (402), and the free ends of the first short rod (501), the second short rod (502) and the third short rod (503) are gathered and hingedly connected.

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