Battery cell voltage acquisition structure of new energy automobile battery

Abstract

The invention relates to a cell voltage acquisition structure of a new energy automobile battery. The cell voltage acquisition structure comprises an acquisition board; one end of the tower spring is electrically connected to each detection end on the acquisition plate, and the other end of the tower spring is in contact with a tab of each battery cell in the battery module; the pressing plate is overlapped on one side, back to the tower spring, of the collecting plate; the limiting structures are symmetrically distributed on two opposite sides of the battery module; the elastic quick release mechanisms are symmetrically distributed on the two opposite sides of the pressing plate, are arranged on the pressing plate in a sliding mode and can compress all the tower springs through the pressing plate; each elastic quick release mechanism is elastically clamped to the corresponding limiting structure in the sliding direction of the elastic quick release mechanism. The limiting structures tightly press the elastic quick-release mechanisms in the compressed direction of the tower springs so that the elastic quick-release mechanisms and the pressing plates can keep compressing the tower springs. According to the invention, it can be ensured that the tower spring on the acquisition plate stably presses the battery cell so that the acquisition plate can stably acquire the voltage of the battery cell, simple disassembly and assembly and efficient disassembly can be realized, the acquisition plate is convenient to replace, and it is ensured that damage is not easy to occur in the disassembly process.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery detection of new energy vehicles, and particularly relates to a battery cell voltage collection structure of a new energy vehicle. BACKGROUND

[0002] In the booming new energy vehicle industry, the battery management system is like the "brain" of the vehicle, and the voltage collection technology for the battery is a very critical component of this "brain". The advantages and disadvantages of the battery voltage collection technology are directly related to whether the battery module can operate safely and efficiently, and thus have a profound impact on the performance of the entire new energy vehicle. At present, there are technical means for collecting voltage by tower spring crimping in the market. This method has certain advantages in actual application, especially when the collection board is damaged. Due to the structural characteristics of the tower spring crimping, the collection board can be relatively conveniently replaced, which greatly reduces the difficulty and cost of maintenance and provides convenience for the maintenance of the battery module. The main advantages of the tower spring voltage collection method on the collection board are good contact stability, which can adapt to vibration and jolt. In application scenarios such as electric vehicles, the equipment will generate vibration and jolt during operation. The tower spring has elasticity and can always maintain good contact with the battery cell in a vibrating environment, ensuring the stability of voltage collection and reducing the risk of data errors or collection interruption caused by poor contact. For example, during the driving process of an electric vehicle, the power battery pack needs to withstand severe jolting, and the tower spring structure can ensure the continuous stability of voltage collection.

[0003] However, any technology will face challenges in the development process, and the tower spring crimping voltage collection method is no exception. In the key link of how to effectively fix and crimp the tower spring, the existing compression structure exposes many problems. The tower spring compression structure designed by some vehicle manufacturers has a relatively complex structure, which directly leads to high manufacturing costs. From the perspective of maintenance, this complex structure makes it difficult to disassemble when necessary, not only consuming a lot of manpower and time, but also easily damaging the compression structure during disassembly. More seriously, the high damage rate not only increases the maintenance cost, but also may affect the normal operation of the battery module, posing a potential threat to the safety of the new energy vehicle. The existence of these problems hinders the further development of the new energy vehicle industry. In the current competitive market environment, reducing costs is one of the important factors to improve product competitiveness. However, the existing tower spring compression structure is high in cost, making it difficult for new energy vehicles to gain greater advantages in price. At the same time, the characteristics of difficult disassembly and high damage rate lead to low maintenance efficiency, which not only affects the user's experience, but also increases the after-sales cost of the vehicle manufacturer. In terms of safety, the instability of the compression structure may cause faults of the battery module, thereby endangering the safety performance of the entire new energy vehicle.

[0004] In view of the above, under the background of continuously pursuing efficient, stable and safe battery voltage acquisition technology in the new energy automobile industry, it is urgent to develop a battery cell voltage acquisition structure specially for tower spring acquisition mode. This new structure should have the characteristics of low cost, so as to help reduce the overall cost of new energy vehicles; easy to disassemble to improve the efficiency of maintenance work; and has a low damage rate, thereby ensuring the safety and stability of the battery module, and providing strong technical support for the healthy development of the new energy automobile industry. SUMMARY

[0005] In order to solve the technical problems existing in the prior art to the greatest extent, the present application provides a battery cell voltage acquisition structure of a new energy automobile battery, which can not only ensure that the tower spring on the acquisition plate is tightly pressed against the battery cell to enable the acquisition plate to stably acquire the battery cell voltage, but also can be easily disassembled and efficiently disassembled to facilitate replacement of the acquisition plate and ensure that the disassembly process is not prone to damage.

[0006] The battery cell voltage acquisition structure of the new energy automobile battery comprises:

[0007] An acquisition plate is provided with a circuit module for acquiring the voltage of the battery cell;

[0008] A plurality of tower springs are respectively electrically connected to each detection end on the acquisition plate at one end, and the other end is used to contact the tab of each battery cell in the battery module;

[0009] A pressing plate is stacked on the side of the acquisition plate opposite to the tower spring;

[0010] A plurality of limiting structures are fixedly arranged and symmetrically distributed on opposite sides of the battery module;

[0011] A plurality of elastic quick-release mechanisms are symmetrically distributed on opposite sides of the pressing plate and are slidingly arranged on the pressing plate and can compress each tower spring through the pressing plate;

[0012] Each elastic quick-release mechanism is elastically clamped to each limiting structure along its sliding direction; each limiting structure tightly presses each elastic quick-release mechanism from the direction in which the tower spring is compressed, so that each elastic quick-release mechanism and the pressing plate keep compressing each tower spring.

[0013] According to the battery cell voltage acquisition structure of the new energy automobile battery, the elastic quick-release mechanism comprises a sliding plate and a return spring;

[0014] The surface of the pressing plate is provided with a mounting groove;

[0015] The sliding plate is engaged and snapped into the mounting groove and can slide along the length of the mounting groove.

[0016] The reset spring is fixed in the mounting groove and elastically connected to the sliding plate;

[0017] Specifically, the sliding plate is pushed by the reset spring to slide out of the port of the mounting groove, so that the sliding plate is engaged with the limiting structure; the sliding plate is retracted into the mounting groove by compressing the reset spring, so that the sliding plate is disengaged from the limiting structure.

[0018] According to a cell voltage acquisition structure for a new energy vehicle battery of the present invention, the limiting structure includes a side plate and a snap-fit ​​hole formed on the side plate;

[0019] The side plate is used to fix it to the side of the battery module;

[0020] The snap-fit ​​hole and the reset spring are located at opposite ends of the mounting groove;

[0021] Specifically, the sliding plate is pushed by the reset spring to slide and extend out of the port of the mounting groove, so that the sliding plate is engaged and snapped into the snap-fit ​​hole.

[0022] The sliding plate is pressed tightly against the first inner side of the snap-fit ​​hole, which is perpendicular to the compression direction of the tower spring, so that the sliding plate and the pressure plate keep each tower spring compressed.

[0023] According to a cell voltage acquisition structure for a new energy vehicle battery of the present invention, two second inner surfaces distributed on opposite sides of the sliding plate on the snap-fit ​​hole contact the sliding plate and restrict the sliding plate from translating along the first inner surface.

[0024] According to a cell voltage acquisition structure for a new energy vehicle battery of the present invention, one end of the sliding plate is integrally formed with a vertically extending push plate.

[0025] The reset spring is fixed at one end to the end face of the mounting groove, and elastically pushes the push plate at the other end.

[0026] According to a cell voltage acquisition structure for a new energy vehicle battery of the present invention, the number of reset springs is several;

[0027] The push plate has several sleeve holes that are coaxially corresponding to the return spring;

[0028] The ends of each of the reset springs are inserted into the sleeve holes and elastically push against the push plate.

[0029] According to the new energy automobile battery cell voltage acquisition structure of the application, the opposite sides of the mounting groove are respectively provided with a plurality of stoppers;

[0030] The opposite sides of the sliding plate are respectively provided with sliding blocks;

[0031] Each stopper extends to the slot opening of the mounting groove and limits the sliding block in the mounting groove to prevent the sliding plate from escaping from the mounting groove in the direction of being pressed against the tower spring.

[0032] According to the new energy automobile battery cell voltage acquisition structure of the application, the gap size between the adjacent two stoppers is greater than or equal to the width size of the sliding block;

[0033] When the sliding block slides to the gap between the adjacent two stoppers, the gap between the adjacent two stoppers allows the sliding block to escape from the mounting groove in the direction of being pressed against the tower spring.

[0034] According to the new energy automobile battery cell voltage acquisition structure of the application, a plurality of positioning holes are formed in the pressing plate;

[0035] The acquisition plate is provided with a plurality of positioning columns;

[0036] Each positioning column is respectively matched and sleeved in each positioning hole.

[0037] According to the new energy automobile battery cell voltage acquisition structure of the application, a plurality of data connectors are arranged on the acquisition plate;

[0038] A plurality of avoiding holes are formed in the pressing plate and are respectively matched with the data connectors, and each avoiding hole allows each data connector to pass through the pressing plate.

[0039] The new energy automobile battery cell voltage acquisition structure of the application first comprises an acquisition plate and a plurality of tower springs, the tower springs are electrically connected between the detection end of the acquisition plate and the pole lug of the cell, so that the acquisition plate can acquire the voltage data of each cell in the battery module through each tower spring respectively, in order to ensure that the tower springs on the acquisition plate are stably pressed against the cell, a pressing plate, a plurality of limiting structures and a plurality of elastic quick release mechanisms are additionally provided, the pressing plate is responsible for being superimposed on the side of the acquisition plate opposite to the tower springs, the plurality of limiting structures are fixedly arranged, and each limiting structure is symmetrically distributed on the opposite sides of the battery module, and the plurality of elastic quick release mechanisms are symmetrically distributed on the opposite sides of the pressing plate and are slidingly arranged on the pressing plate, during assembly, each elastic quick release mechanism is elastically clamped in each limiting structure along the sliding direction of itself, when the elastic quick release mechanism and the limiting structure are clamped with each other, each limiting structure tightly presses each elastic quick release mechanism from the direction of being compressed by the tower spring, so that each elastic quick release mechanism can press the pressing plate, and finally each elastic quick release mechanism and the pressing plate keep compressing each tower spring, so that the acquisition plate can stably acquire the cell voltage, when it is necessary to disassemble and replace the acquisition plate, as long as the elastic reset movement of each elastic quick release mechanism is controlled and is separated from the limiting structure, each elastic quick release mechanism can be separated from the battery module together with the pressing plate, at this time, the acquisition plate is no longer subjected to the pressing force of the pressing plate, at the same time, each tower spring is elastically pushed upward to the acquisition plate, the pressing plate and each elastic quick release mechanism, so that the acquisition plate can be easily disassembled from the battery module, and the effects of simple disassembly and efficient disassembly are realized, so as to facilitate the replacement of the acquisition plate and ensure that the disassembly process is not easy to damage. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0041] Figure 1 It is the overall structure diagram of the application;

[0042] Figure 2 It is the side view of the application;

[0043] Figure 3 It is the partial enlarged view of Figure 2 ; It is the partial enlarged view of

[0044] Figure 4 It is the partial enlarged view of Figure 2 ; It is the partial enlarged view of

[0045] Figure 5 is a left view of the present application;

[0046] Figure 6 is a top view of the present application;

[0047] Figure 7 is a top view of the present application (hiding sliding block 51, positioning column 11, data connector 12);

[0048] Figure 8 is a structure view of the sliding block in the present application;

[0049] Figure 9 is a sectional view of the sliding block in the present application.

[0050] Reference signs:

[0051] 1, collecting plate, 11, positioning column, 12, data connector;

[0052] 2, tower spring;

[0053] 3, pressing plate, 31, mounting groove, 32, stop block, 33, positioning hole, 34, avoiding hole;

[0054] 4, limiting structure, 41, side plate, 42, clamping hole, 43, first inner side, 44, second inner side;

[0055] 5, elastic quick release mechanism, 51, sliding plate, 52, return spring, 53, push plate,

[0056] 54, sleeve hole, 55, sliding block. DETAILED DESCRIPTION

[0057] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application. In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on 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 therefore cannot be understood as indicating or implying 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 of the present application.

[0058] As Figures 1 to 9As shown, the new energy automobile battery cell voltage acquisition structure of the embodiment mainly comprises an acquisition plate 1, a plurality of tower springs 2, a pressing plate 3, a plurality of limiting structures 4 and a plurality of elastic quick-release mechanisms 5. The acquisition plate 1 is electrically connected with a circuit module (not shown in the figure) for acquiring cell voltage. The upper ends of the tower springs 2 are respectively electrically connected to each detection end on the lower side of the acquisition plate 1. The lower ends of the tower springs 2 contact the tabs of each cell in the battery module, so that the acquisition plate 1 can acquire the voltage data of each cell through the tower springs 2. The pressing plate 3 is stacked on the upper side of the acquisition plate 1. Each limiting structure 4 is fixedly arranged. Specifically, the number of limiting structures 4 is four. The four limiting structures 4 are fixed on the battery module and symmetrically distributed on opposite sides of the battery module. The number of elastic quick-release mechanisms 5 is also four. The four elastic quick-release mechanisms 5 are symmetrically distributed on opposite sides of the pressing plate 3 and are slidingly arranged on the pressing plate 3. The four elastic quick-release mechanisms 5 can compress each tower spring 2 through the pressing plate 3. Each elastic quick-release mechanism 5 is elastically clamped to each limiting structure 4 along the sliding direction thereof. Each limiting structure 4 tightly presses each elastic quick-release mechanism 5 from the direction in which the tower spring 2 is compressed, so that each elastic quick-release mechanism 5 and the pressing plate 3 keep compressing each tower spring 2.

[0059] It can be understood that the above structure first includes the collection plate 1 and a plurality of tower springs 2, the tower springs 2 are electrically connected between the detection end of the collection plate 1 and the tab of the battery cell, so that the collection plate 1 can collect the voltage data of each battery cell in the battery module through each tower spring 2 respectively, in order to ensure that the tower springs 2 on the collection plate 1 are stably pressed against the battery cell, a pressing plate 3, a plurality of limiting structures 4 and a plurality of elastic quick release mechanisms 5 are additionally provided, the pressing plate 3 is responsible for being superimposed on one side of the collection plate 1 opposite to the tower springs 2, the plurality of limiting structures 4 are fixedly arranged, and each limiting structure 4 is used for being symmetrically distributed on the opposite sides of the battery module, and the plurality of elastic quick release mechanisms 5 are symmetrically distributed on the opposite sides of the pressing plate 3 and are slidingly arranged on the pressing plate 3, during assembly, each elastic quick release mechanism 5 is elastically clamped in each limiting structure 4 along the sliding direction of itself, when the elastic quick release mechanism 5 and the limiting structure 4 are clamped to each other, each limiting structure 4 is pressed against each elastic quick release mechanism 5 from the direction of compression of the tower spring 2, so that each elastic quick release mechanism 5 can press the pressing plate 3, and finally each elastic quick release mechanism 5 and the pressing plate 3 keep compressing each tower spring 2, so that the collection plate 1 can stably collect the voltage of the battery cell, when it is necessary to disassemble and replace the collection plate 1, as long as the elastic quick release mechanism 5 is controlled to be elastically reset and separated from the limiting structure 4, the elastic quick release mechanism 5 can be separated from the limiting structure 4, and the collection plate 1 can be separated from the battery module together with the pressing plate 3, at this time, the collection plate 1 is no longer pressed by the pressing plate 3, and at the same time, each tower spring 2 is elastically pushed upward, so that the collection plate 1, the pressing plate 3 and each elastic quick release mechanism 5 are elastically pushed upward, so the collection plate 1 can be easily disassembled from the battery module, realizing the effect of simple disassembly and efficient disassembly, so as to facilitate the replacement of the collection plate, and the damage in the disassembly process can be avoided.

[0060] Regarding the elastic quick release mechanism 5 of the present embodiment, the specific structure includes a sliding plate 51 and a reset spring 52, the plate surface of the pressing plate 3 is provided with four mounting grooves 31, the sliding plate 51 of the four elastic quick release mechanisms 5 is clamped in the mounting groove 31 and can slide along the length direction of the mounting groove 31, the reset spring 52 is fixed in the mounting groove 31, one end of the reset spring 52 is fixed to the inner side end face of the mounting groove 31, and the other end of the reset spring 52 is elastically connected to the sliding plate 51, after the sliding plate 51 is elastically pushed to slide out of the mounting groove 31 by the reset spring 52, the sliding plate 51 can be clamped in the limiting structure 4, so that the elastic quick release mechanism 5 and the limiting structure 4 can be clamped to each other, when the sliding plate 51 and the limiting structure 4 are clamped to each other, the pressing plate 3 can be fixedly superimposed on the collection plate 1 and keep pressing the collection plate 1 and the tower spring 2. On the contrary, by controlling the sliding plate 51 to retract into the mounting groove 31, the sliding plate 51 can be separated from the limiting structure 4, and the collection plate 1 can no longer be pressed by the pressing plate 3, at this time, under the elastic upward pushing action of each tower spring 2, the collection plate 1 and the pressing plate 3 can be separated from the battery module, so the collection plate 1 can be disassembled from the battery module.

[0061] Regarding the limiting structure 4 of the present embodiment, the specific structure includes side plates 41 and clamping holes 42 provided on the side plates 41. Specifically, two side plates 41 are fixed to the opposite two sides of the battery module, and two clamping holes 42 are provided on each side plate 41. The number of clamping holes 42 is the same as the number of mounting grooves 31, and the ports of each mounting groove 31 correspond to each clamping hole 42. The clamping holes 42 and the return springs 52 are distributed at opposite ends of the mounting grooves 31. During assembly, the return spring 52 elastically pushes the sliding plate 51 to slide and extend out of the port of the mounting groove 31, and then the sliding plate 51 is clamped into the clamping hole 42. Therefore, the four sliding plates 51 can be clamped with the opposite two side plates 41. In addition, the first inner side surface 43 of the clamping hole 42 perpendicular to the compression direction of the tower spring 2 tightly presses the sliding plate 51 downward. The clamping force of the first inner side surface 43 of the clamping hole 42 on the sliding plate 51 can keep the sliding plate 51 and the pressing plate 3 compressed on each tower spring 2. In this way, it can be ensured that the pressing plate 3 can be fixed to the collecting plate 1 and keep the collecting plate 1 and the tower spring 2 compressed. Similarly, as long as each sliding plate 51 is pushed in the opposite direction, each sliding plate 51 is separated from each clamping hole 42, and the pressing plate 3 can be separated from the battery module. The collecting plate 1 is no longer compressed by the pressing plate 3. At this time, under the elastic upward pushing action of each tower spring 2, the collecting plate 1 and the pressing plate 3 can be separated from the battery module, so that the collecting plate 1 can be detached from the battery module.

[0062] Further, in order to further limit the horizontal movement of the pressing plate 3 to ensure that each tower spring 2 on the collecting plate 1 does not dislocate with the tab of the battery cell, the two second inner side surfaces 44 distributed on the opposite sides of the sliding plate 51 of the clamping hole 42 contact the sliding plate 51 to limit the horizontal translation of the sliding plate 51 along the first inner side surface 43 through the two second inner side surfaces 44. Therefore, when the sliding plate 51 is inserted into the clamping hole 42, the two second inner side surfaces 44 can limit the horizontal movement of the pressing plate 3 through the sliding plate 51, so that the pressing plate 3 can be more stably compressed downward on the collecting plate 1, effectively ensuring that each tower spring 2 on the collecting plate 1 does not dislocate with the tab of the battery cell.

[0063] In the present embodiment, in order to facilitate the movement of the sliding plate 51 in the mounting groove 31, a vertically extending push plate 53 is integrally formed at one end of the sliding plate 51. By pushing the push plate 53, the sliding plate 51 can be moved, which is convenient to operate. The return spring 52 is fixed at one end to the end surface of the mounting groove 31 and elastically pushes the push plate 53 at the other end, so as to ensure that the return spring 52 can normally push the sliding plate 51.

[0064] In the embodiment, the number of the reset springs 52 in each mounting groove 31 is two, and correspondingly, two sleeve holes 54 are also formed on the push plate 53, each sleeve hole 54 is coaxial with each reset spring 52, and in assembly, the end of the reset spring 52 is inserted into the sleeve hole 54 and elastically pushes the push plate 53, so that the reset spring 52 cannot easily separate from the push plate 53, and the elasticity of the reset spring 52 is maintained to act on the sliding plate 51.

[0065] In the embodiment, the opposite sides of each mounting groove 31 are respectively provided with a plurality of stop blocks 32, each stop block 32 is close to the middle of the mounting groove 31 and extends to the slot of the mounting groove 31, and correspondingly, the opposite sides of each sliding plate 51 are integrally formed with a sliding block 55, and each stop block 32 is in limiting contact with the sliding block 55 in the mounting groove 31, so as to limit the sliding plate 51 from escaping from the mounting groove 31 in the direction of being pressed against the coil spring 2, and ensure that the sliding plate 51 can be stably installed in the mounting groove 31. Further, on the mounting groove 31, the gap size between the adjacent two stop blocks 32 is greater than or equal to the width size of the sliding block 55, when the sliding block 55 slides to the gap between the adjacent two stop blocks 32, the gap between the adjacent two stop blocks 32 allows the sliding block 55 to escape from the mounting groove 31 in the direction of being pressed against the coil spring 2, and through the structure, the sliding plate 51 can be quickly disassembled and installed in the mounting groove 31.

[0066] In the embodiment, the pressing plate 3 is also provided with two positioning holes 33, and correspondingly, the collecting plate 1 is fixed with two positioning columns 11, each positioning column 11 is fitted in each positioning hole 33, so that in the process of assembling the pressing plate 3, the installation position of the pressing plate 3 on the collecting plate 1 and the battery module can be determined through the cooperation of each positioning column 11 and the positioning hole 33, and after the pressing plate 3 is installed, each sliding plate 51 on the pressing plate 3 can accurately correspond to each clamping hole 42 on each side plate 41, and each sliding plate 51 can be accurately clamped into each clamping hole 42.

[0067] In the embodiment, the collecting plate 1 is provided with a plurality of data connectors 12, each data connector 12 is used for electrically connecting the collection circuit on the collecting plate 1 and used for connecting external electrical devices, in order to avoid that the pressing plate 3 blocks each data connector 12 on the collecting plate 1, the pressing plate 3 is provided with a plurality of avoiding holes 34 which are matched with the data connectors 12, each avoiding hole 34 allows each data connector 12 to pass out of the pressing plate 3, so that each data connector 12 can be normally connected to the external electrical devices.

[0068] It should be noted that in practical applications, when the acquisition board 1 acquires the cell voltage through the tower spring 2, there is often a voltage acquisition error ∈, which will affect the accuracy of the data acquired by the acquisition board 1 and reduce the accuracy of the voltage data acquisition. In this embodiment, in order to minimize the above-mentioned voltage acquisition error ∈, the compression stroke ratio x of the tower spring 2 when the pressure plate 3 presses down on the acquisition board 1 is calculated according to the formula. The specific compression dimensions of the pressure plate 3 on the tower spring 2 are determined, thereby determining the required assembly height of the sliding plate 51 and the required height position of the snap-fit ​​hole 42 on the side plate 41. In the above formula, Δh is the compression stroke of the pressure plate 3 on the tower spring 2, h0 is the initial height of the tower spring 2, C is the contact resistance constant between the tower spring 2 and the battery cell tab, A is the cross-sectional area of ​​the tower spring 2, k is the elastic coefficient of the tower spring 2, and ρ is the resistivity of the tower spring 2.

[0069] Tower spring resistor R under voltage acquisition condition s The resistance can be calculated by measuring the compressed length, based on the resistance law, to determine the resistance of the tower spring. This is the derived formula one, where ρ is the resistivity of the spring 2, A is the cross-sectional area of ​​the spring 2, and L = (h0 - Δh) is the height of the spring 2 after compression. The compressive force F exerted by the pressure plate 3 on the spring 2 is determined by the spring's elastic coefficient and compression stroke, and can be expressed by the formula F = k × Δh. Furthermore, according to Holm's law, the contact resistance between the spring and the battery cell is inversely proportional to the contact force. Combining this with the physical relationship of the compressive force F, the contact resistance R between the spring and the battery cell... contact Through formula This indicates that this is the derived formula two, where C is also the contact resistance constant between the tower spring 2 and the battery cell tab. Furthermore, the voltage acquisition error mainly originates from the tower spring resistance R. s and contact resistance R contact The combined effects of these factors mean that the optimization objective is to minimize the total resistance R. total Minimize the total resistance R total Optimizing to the minimum value can help reduce the voltage acquisition error ∈, i.e., the total resistance R. total =R s +P contact Then substitute Formula 1 and Formula 2 into the total resistance R. total From the relational expression, we can further derive This is the derived formula three. As mentioned above, the total resistance R... total Optimizing to the minimum value can help reduce the voltage acquisition error ∈ mentioned above. Therefore, for the resistance R in Formula 3... total Differentiate the compression stroke Δh of pressure plate 3 on tower spring 2 and set it equal to 0, i.e. Finally, the solution can be obtained. Therefore, the above formula can be obtained The compression stroke ratio x of the compression of the tower spring 2 by the compression of the compression plate 3 to the collection plate 1 is calculated by the formula, and the total resistance R generated by the tower spring 2 when collecting the voltage of the battery cell is reduced by the compression of the compression plate 3 to the tower spring 2 according to the compression stroke ratio x calculated by the formula. total The minimum can finally help to reduce the voltage collection error ε, so as to ensure the accuracy of the data collected by the collection plate 1 when collecting the voltage of the battery cell, and optimize the collection accuracy of the voltage data.

[0070] It should be noted that in the above formula, the resistivity ρ of the tower spring can be measured by a multimeter, and the elastic coefficient k of the tower spring can be obtained by looking up a table. The contact resistance constant C of the tower spring and the tab of the battery cell can be obtained by experimental measurement in actual application. The experimental steps are as follows: S1, first prepare samples, including the tower spring and the corresponding tab of the battery cell, and install the tower spring and the tab of the battery cell on the test fixture to ensure good contact between the two; S2, use the test fixture to apply a known contact force F to the tower spring (which can be realized by a standard force sensor); S3, measure the actual contact resistance R contact at this time by using an instrument; S4, use the formula to solve C, that is, C = R contact × F. Finally, multiple measurements are taken, and the contact resistance is repeatedly measured under different contact forces to take the average value to improve the accuracy of the contact resistance constant C.

[0071] In this embodiment, the resistivity ρ of the tower spring is set to 1.68 × 10 -8 Ω·m, the cross-sectional area A of the tower spring 2 is 1 × 10 -6 ㎡, the elastic coefficient k of the tower spring 2 is 500 N / m, the initial height h0 of the tower spring 2 is 0.01 m, and the contact resistance constant C of the tower spring 2 and the tab of the battery cell is 3.024 × 10 -4 N·Ω, and then the above formula is used to calculate the compression stroke △h of the tower spring 2 by the compression of the compression plate 3:

[0072]

[0073] Finally, the compression stroke ratio x of the tower spring 2 by the compression of the compression plate 3 to the collection plate 1 is calculated:

[0074]

[0075] According to the above calculation results, that is, the initial height of the tower spring 2 in this embodiment is 1 cm, and after the assembly is completed, the tower spring 2 is compressed by 0.6 cm by the compression of the compression plate 3 to the collection plate 1, at this time, the voltage collection error ε can be effectively reduced.

[0076] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit the same; and although the present application has been described in detail with reference to the foregoing embodiments, it should be appreciated by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell voltage acquisition structure of a new energy vehicle battery, characterized in that, The utility model relates to a kind of battery module voltage acquisition device, including: Collecting plate (1) is provided with circuit module for collecting cell voltage; Several tower springs (2), each tower spring (2) is electrically connected to each detection end on the collecting plate (1) one end respectively, the other end is used to contact the tab of each cell in battery module; Pressing plate (3) is superimposed on the side of the collecting plate (1) opposite to the tower spring (2); Several limiting structures (4) are fixedly arranged and used to be symmetrically distributed on the opposite sides of battery module; Several elastic quick-release mechanisms (5) are symmetrically distributed on the opposite sides of the pressing plate (3) and are slidingly arranged on the pressing plate (3) and can compress each tower spring (2) by the pressing plate (3); Wherein, each elastic quick-release mechanism (5) is elastically clamped in each limiting structure (4) along the sliding direction of itself respectively;Each limiting structure (4) is pressed from the direction of each tower spring (2) compression to each elastic quick-release mechanism (5) to make each elastic quick-release mechanism (5) and the pressing plate (3) keep compressing each tower spring (2).

2. The battery cell voltage acquisition structure of a new energy vehicle battery according to claim 1, characterized in that, The elastic quick-release mechanism (5) includes a sliding plate (51) and a return spring (52); The surface of the pressing plate (3) is provided with a mounting groove (31); The sliding plate (51) is clamped in the mounting groove (31) and can slide along the length direction of the mounting groove (31); The return spring (52) is fixed in the mounting groove (31) and is elastically connected to the sliding plate (51); Wherein, the sliding plate (51) is slid by the return spring (52) and extends out of the port of the mounting groove (31) to let the sliding plate (51) be clamped in the limiting structure (4);By retracting the return spring (52) and the sliding plate (51) into the mounting groove (31), the sliding plate (51) is separated from the limiting structure (4).

3. The battery cell voltage acquisition structure of a new energy vehicle battery according to claim 2, characterized in that, The limiting structure (4) includes a side plate (41) and a clamping hole (42) opened on the side plate (41); The side plate (41) is used to be fixed on the side of battery module; The clamping hole (42) and the return spring (52) are distributed on opposite ends of the mounting groove (31); Wherein, the sliding plate (51) is slid by the return spring (52) and extends out of the port of the mounting groove (31) to let the sliding plate (51) be clamped in the clamping hole (42); The first inner side face (43) of the clamping hole (42) is pressed against the sliding plate (51) and drives the sliding plate (51) and the pressing plate (3) to keep compressing each tower spring (2).

4. The battery cell voltage acquisition structure of a new energy vehicle battery according to claim 3, characterized in that, The two second inner side faces (44) of the clamping hole (42) distributed on the opposite sides of the sliding plate (51) contact the sliding plate (51) and limit the sliding plate (51) to translate along the first inner side face (43).

5. The battery cell voltage acquisition structure of a new energy vehicle battery according to claim 2, characterized in that, One end of the sliding plate (51) is integrally formed with a vertically extending push plate (53); The reset spring (52) is fixed at one end of the end face of the mounting groove (31), and the other end elastically pushes the push plate (53). 6.The battery cell voltage acquisition structure of a new energy vehicle battery according to claim 5, characterized in that, The number of the reset spring (52) is several; The push plate (53) is provided with several sleeve holes (54) coaxially corresponding to the reset spring (52); Wherein, the end of each reset spring (52) is inserted into the sleeve hole (54) and elastically pushes the push plate (53). 7.The battery cell voltage acquisition structure of a new energy vehicle battery according to claim 2, characterized in that, The opposite sides of the mounting groove (31) are respectively provided with several stoppers (32); The opposite sides of the sliding plate (51) are respectively provided with sliding blocks (55); Each stopper (32) extends to the slot of the mounting groove (31) and is in position contact with the sliding block (55) in the mounting groove (31) to limit the sliding plate (51) from escaping from the mounting groove (31) in the direction of being pressed against the tower spring (2). 8.The battery cell voltage acquisition structure of a new energy vehicle battery according to claim 7, characterized in that, The gap size between adjacent two stoppers (32) is greater than or equal to the width size of the sliding block (55); When the sliding block (55) slides to the gap between adjacent two stoppers (32), the gap between adjacent two stoppers (32) allows the sliding block (55) to escape from the mounting groove (31) in the direction of being pressed against the tower spring (2). 9.The battery cell voltage acquisition structure of a new energy vehicle battery according to claim 1, characterized in that, The pressing plate (3) is provided with several positioning holes (33); The collection plate (1) is provided with several positioning columns (11); Each positioning column (11) is respectively matched and sleeved in each positioning hole (33). 10.The new energy vehicle battery cell voltage acquisition structure of claim 1, wherein, The collection plate (1) is provided with several data connectors (12); The pressing plate (3) is provided with several avoidance holes (34) matched with the data connectors (12) Each avoidance hole (34) allows each data connector (12) to pass out of the pressing plate (3).

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