A power battery electrical connection system and battery pack thereof

Abstract

The present invention relates to the field of battery technology, and specifically to a power battery electrical connection system and a battery pack thereof. The power battery pack includes a battery unit and a connection unit, and conductive columns are fixedly arranged at the positive and negative electrodes of the battery pack, wherein a connecting plate and a connecting rod connect at least two battery packs in series, wherein the connecting plates connected to two adjacent battery packs are connected by sliding up and down, and the connecting rod is set as a telescopic structure. After long-term operation, the connection points of two adjacent battery packs are prone to oxidation. At this time, the connecting plates connected to the two adjacent battery packs are driven to slide relative to each other, changing the original contact position, ensuring the stability of the connection between the two battery packs, and reducing the probability of safety accidents caused by improper connection of the battery packs.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a power battery electrical connection system and a battery pack thereof. Background Art

[0002] The power battery pack is composed of multiple battery packs connected in series or in parallel to ensure that the composed power battery pack reaches the rated output voltage and rated output current. The conventional connection method is to connect the positive or negative pole of the battery pack through a wire. However, after long-term use, the connection point between the wire and the positive or negative pole of the battery pack is prone to oxidation. The oxide layer at the connection point causes the resistance of the connection point to increase, affecting the output power of the battery. At the same time, the oxidation of the connection point can cause the heat of the contact point to increase. High temperature can affect the performance and life of the battery, thereby causing safety accidents. Summary of the invention

[0003] The present invention provides a power battery electrical connection system and a battery pack thereof, so as to solve the problem that the battery pack connection method in the existing power battery pack is prone to cause safety accidents.

[0004] A power battery electrical connection system and a battery pack thereof of the present invention adopt the following technical solutions:

[0005] A power battery pack comprises a battery unit and a connection unit.

[0006] A plurality of battery cells are provided, and the plurality of battery cells are connected in series or in parallel; each battery cell includes at least two battery packs, and at least two battery packs are connected in series to form a battery cell, and the positive and negative ends of each battery pack are fixedly provided with conductive columns; at least two battery packs in each battery cell are distributed in parallel and spaced apart; a plurality of connecting units are provided, and each connecting unit is provided corresponding to a battery cell, and each connecting unit includes a connecting rod and at least two connecting plates; each connecting plate is provided with a connecting hole, and the conductive column on each battery pack can pass through the connecting hole, and each connecting plate is installed at the positive or negative end of a battery pack, and the extreme ends of the connecting plates of two adjacent battery packs are opposite, and the connecting plates on the two adjacent battery packs are connected by sliding up and down; the two ends of the connecting rod are respectively rotated to connect the conductive columns, and the connecting rod can be telescopically arranged.

[0007] Furthermore, a plurality of first grinding strips are disposed on the side wall of each conductive column, and the plurality of first grinding strips are evenly distributed around the circumference of the conductive column.

[0008] Furthermore, both ends of the connecting rod are fixedly connected with a connecting sleeve, which is rotatably sleeved on the outside of the conductive column, and a plurality of second grinding strips are arranged on the inner circumferential wall of the connecting sleeve, and the plurality of second grinding strips are evenly distributed around the inner circumferential wall of the connecting sleeve.

[0009] Furthermore, the middle diameter of the conductive column is larger than the diameters at both ends, and the inner diameter of the middle of the connecting sleeve is larger than the inner diameters at both ends. In the initial installation state, the position with the largest diameter of the conductive column is outside the connecting sleeve, and the inner circumferential wall of the connecting sleeve abuts against the outer circumferential wall of the conductive column.

[0010] Furthermore, an extrusion plate is evenly and fixedly arranged on each connecting plate, and the extrusion plate always abuts against the middle part of the connecting rod. The extrusion plate has a first inclined section and a second inclined section, and the first inclined section and the second inclined section are spaced apart from each other. A vertical section is arranged between the first inclined section and the second inclined section, and the inclination directions of the first inclined section and the second inclined section are opposite. The first inclined section, the second inclined section and the vertical section form an expansion opening that opens toward the side away from the battery pack. In the initial state, the connecting rod abuts against the vertical section.

[0011] Furthermore, the connection unit further includes at least two auxiliary plates, each of which is provided with an auxiliary hole, through which the conductive column can pass; each auxiliary plate is mounted on a battery pack, and the two auxiliary plates on two adjacent battery packs are connected by sliding up and down;

[0012] Furthermore, multiple battery cells are arranged in an array along the vertical direction, multiple auxiliary plates in the same vertical column of the multiple battery cells are fixedly connected, and multiple connecting plates in the same vertical column of the multiple battery cells are fixedly connected; wires are provided on the auxiliary plates, and the wires can connect the multiple battery cells in series or in parallel.

[0013] A power battery electrical connection system comprises the power battery pack described in any one of the above items, and further comprises a control board, wherein the control board can perform the following steps:

[0014] S100: Obtaining a standard voltage and a standard resistance of a battery pack;

[0015] S200: obtaining the voltage, resistance and temperature of the battery pack in a fully charged state;

[0016] S300: if the absolute value of the difference between the voltage of the battery pack in a fully charged state and the standard voltage is greater than a first preset value, or the difference between the resistance of the battery pack in a fully charged state and the standard resistance is greater than a second preset value, then start the first adjustment mode to adjust the connection between the battery packs;

[0017] S400: Obtaining the real-time voltage, real-time resistance and temperature of each battery pack of the battery pack in use;

[0018] S500: Obtain the difference between the maximum and minimum voltages of the battery pack within a unit time; and obtain the variance of the temperature of each battery pack;

[0019] S600: If the difference between the maximum voltage and the minimum voltage of the battery pack per unit time is greater than the third preset value, or the difference between the real-time resistance and the standard resistance is greater than the second preset value, or the variance of the temperature of each battery pack is greater than the variance of a new battery at the same temperature, then execute the second adjustment mode to adjust the connection between the battery packs.

[0020] Furthermore, the first adjustment mode in step S300 includes:

[0021] S310: Push the connecting plates on two adjacent battery packs to slide up and down.

[0022] Furthermore, the second adjustment mode in step S600 includes:

[0023] S610: Push the connecting plates on two adjacent battery packs upward or downward to slide.

[0024] The beneficial effects of the present invention are as follows: a power battery pack of the present invention includes a battery unit and a connection unit, and a conductive column is fixedly set at the positive and negative electrodes of the battery pack, wherein the connection plate and the connection rod connect at least two battery packs in series, wherein the connection plates connected to two adjacent battery packs are connected by sliding up and down, and the connection rod is set as a telescopic structure. After long-term operation, the connection points of two adjacent battery packs are prone to oxidation. At this time, the connection plates connected to the two adjacent battery packs are driven to slide relative to each other, changing the original contact position, ensuring the stability of the connection between the two battery packs, and reducing the probability of safety accidents caused by improper connection of the battery packs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 This is a schematic diagram of the structure of a power battery pack provided in Embodiment 1 of the present invention;

[0027] Figure 2 A front view of a power battery pack provided in Embodiment 1 of the present invention;

[0028] Figure 3 This is a partial structural schematic diagram of a connecting rod in a power battery pack provided in Embodiment 1 of the present invention;

[0029] Figure 4 A cross-sectional view of a battery pack and a conductive column in a power battery pack provided in Embodiment 1 of the present invention;

[0030] Figure 5 This is a schematic structural diagram of an auxiliary board in a power battery pack provided in Embodiment 1 of the present invention;

[0031] Figure 6 A side view of a connecting plate in a power battery pack provided in Embodiment 1 of the present invention;

[0032] Figure 7 A state diagram of a connecting plate connected to two adjacent battery packs in a power battery pack provided in Embodiment 1 of the present invention sliding up and down;

[0033] Figure 8 A flow chart executed by a control board in a power battery electrical connection system provided by an embodiment of the present invention.

[0034] In the figure: 110, battery pack; 111, conductive column; 120, connecting rod; 121, guide rod; 122, guide groove; 130, connecting plate; 140, first grinding strip; 150, second grinding strip; 160, connecting sleeve; 210, extrusion plate; 211, first inclined section; 212, second inclined section; 213, vertical section; 310, auxiliary plate; 311, auxiliary hole; 312, wire. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] Embodiment 1: Figures 1 to 7 As shown, an embodiment of the present invention provides a power battery pack, which includes a battery unit and a connection unit;

[0039] A plurality of battery cells are provided, and the plurality of battery cells are connected in series or in parallel, so as to ensure that the rated output voltage and rated output current of the battery pack meet the standards. Each battery cell includes at least two battery packs 110. In this embodiment, the minimum number of battery packs 110 is taken as an example, that is, in this embodiment, each battery cell includes two battery packs 110, and the two battery packs 110 extend in the front-to-back direction, and the two battery packs 110 are spaced apart from each other. Each battery pack 110 has a positive terminal and a negative terminal, and a conductive column 111 is fixedly provided at the positive terminal and the negative terminal of each battery pack 110, and the two conductive columns 111 on the same battery pack 110 are on the same straight line, and the conductive column 111 is coaxial with the battery pack 110.

[0040] A plurality of connection units are provided, and each connection unit is provided corresponding to a battery unit. Each connection unit includes a connection rod 120 and at least two connection plates 130. According to the setting of the number of battery packs 110, the number of connection plates 130 is equal to the number of battery packs 110. In this embodiment, each connection unit includes a connection rod 120 and two connection plates 130. Each connection plate 130 is provided with a through connection hole, and the conductive column 111 can pass through the connection hole. Each connection plate 130 is connected to a battery pack 110, and the conductive columns 111 on the battery pack 110 all pass through the connection hole. The ends of the connection plates 130 installed in two adjacent battery packs 110 are opposite, that is, the conductive column 111 of the positive end of one battery pack 110 is installed with the connection plate 130, and the conductive column 111 of the negative end of the other adjacent battery pack 110 is installed with the connection plate 130. The two connection plates 130 connected on the two adjacent battery packs 110 are coplanar, and the two connection plates 130 on the two adjacent battery packs 110 are connected by sliding up and down. The connecting rod 120 can be telescopically arranged, and the connecting rod 120 can be divided into two sections. The two sections of the connecting rod 120 have the same structure, and each section of the connecting rod 120 has a guide rod 121 and a guide groove 122, wherein the guide rod 121 of one section of the connecting rod 120 can be inserted into the guide groove 122 of another section of the connecting rod 120. The connecting rod 120 is made of conductive material, and is used to connect the conductive posts 111 on two adjacent battery packs 110 to ensure that in one battery unit, the two battery packs 110 are connected in series.

[0041] In this embodiment, a plurality of first grinding strips 140 are provided on the side wall of each conductive column 111, and the plurality of first grinding strips 140 are evenly distributed around the circumference of the conductive column 111. When the connecting plates 130 on two adjacent battery packs 110 slide up and down, the connecting rod 120 and the conductive column 111 move relative to each other, and the contact point between the connecting rod 120 and the conductive column 111 changes. The first grinding strips 140 provided on the side wall of the conductive column 111 grind the connecting rod 120 to ensure that the conductive column 111 and the connecting rod 120 maintain effective electrical connection.

[0042] In this embodiment, both ends of the connecting rod 120 are fixedly connected with a connecting sleeve 160, and the connecting sleeve 160 is rotatably sleeved on the outer side of the conductive column 111, and a plurality of second grinding strips 150 are arranged on the inner circumferential wall of the connecting sleeve 160, and the plurality of second grinding strips 150 are evenly distributed around the inner circumferential wall of the connecting sleeve 160. When the two connecting plates 130 on two adjacent battery packs 110 move up and down relative to each other, the connecting rod 120 and the conductive column 111 move relative to each other, and the contact point between the connecting rod 120 and the conductive column 111 changes, and the second grinding strips 150 arranged on the inner side wall of the connecting sleeve 160 grind the conductive column 111. When the connecting rod 120 and the conductive column 111 move relative to each other, the first grinding strip 140 and the second grinding strip 150 work together to ensure that the conductive column 111 and the connecting rod 120 maintain effective electrical connection.

[0043] In this embodiment, the middle diameter of the conductive column 111 is larger than the diameters at both ends, the inner diameter of the middle part of the connecting sleeve 160 is larger than the inner diameters at both ends, and the outer wall of the conductive column 111 and the inner wall of the connecting sleeve 160 are both smooth arcs. In the initial state, the point with the largest diameter of the conductive column 111 is located outside the connecting sleeve 160, and the inner circumferential wall of the connecting sleeve 160 abuts against the outer circumferential wall of the conductive column 111 to prevent the connecting sleeve 160 from automatically detaching from the conductive column 111. When the connecting sleeve 160 and the conductive column 111 slide relative to each other in the axial direction, the connecting sleeve 160 tightly abuts against the conductive column 111.

[0044] Furthermore, an extrusion plate 210 is evenly fixedly arranged on each connecting plate 130, and the extrusion plate 210 always abuts against the middle of the connecting rod 120. The extrusion plate 210 has a first inclined section 211 and a second inclined section 212. The first inclined section 211 and the second inclined section 212 are spaced apart from each other. A vertical section 213 is arranged between the first inclined section 211 and the second inclined section 212. The inclination directions of the first inclined section 211 and the second inclined section 212 are opposite. The vertical section 213 forms an expansion opening toward the side away from the battery pack 110. In the initial state, the connecting rod 120 abuts the vertical section 213. When the connecting plate 130 connected to two adjacent battery packs 110 slides up and down, the middle part of the connecting rod 120 is on the first inclined section 211 or the second inclined section 212. The first inclined section 211 or the second inclined section 212 squeezes the connecting rod 120 outward. At this time, the connecting sleeves 160 at both ends of the connecting rod 120 are more tightly wrapped around the outside of the conductive column 111.

[0045] In this embodiment, the connection unit further includes at least two auxiliary plates 310, each of which is provided with an auxiliary hole 311, through which the conductive column 111 can pass. Each auxiliary plate 310 is mounted on a battery pack 110, and the conductive column 111 on the battery pack 110 can pass through the auxiliary hole 311. On the same battery pack 110, the auxiliary plates 310 and the connecting plate 130 are distributed at both ends of the battery pack 110, wherein the two auxiliary plates 310 connected to the two adjacent battery packs 110 are connected by sliding up and down, thereby increasing the connection stability of the battery unit.

[0046] In this embodiment, multiple battery cells are arranged in an array along the vertical direction, and the auxiliary plates 310 in the same vertical column of multiple battery cells are fixedly connected, and the connecting plates 130 in the same vertical column of multiple battery cells are fixedly connected. A wire 312 is provided on the auxiliary plate 310, and the wire 312 can connect multiple battery cells in series or in parallel.

[0047] In this embodiment, each battery pack 110 is provided with a temperature sensor, and the temperature sensor can obtain the temperature of the battery pack 110 .

[0048] like Figure 8 As shown, an embodiment of the present invention provides a power battery electrical connection system, including the power battery pack in the above embodiment, and also including a control board, and the control board can perform the following steps:

[0049] S100: Obtain the standard voltage and standard resistance of the battery pack; the standard voltage and standard resistance of the battery pack are respectively the rated voltage and rated resistance of the battery pack, and the standard voltage of the battery pack is defined as V 0 , standard resistance is R 0 .

[0050] S200: Obtain the voltage, resistance and temperature of the battery pack in the fully charged state. In the fully charged state, the relevant data can be measured with the help of a multimeter, wherein the temperature of the battery pack can be read out from the temperature sensor. The voltage of the battery pack in the fully charged state is defined as V 1 , the resistance is R 1 .

[0051] S300: If the absolute value of the difference between the voltage of the battery pack in the fully charged state and the standard voltage is greater than the first preset value, or the difference between the resistance of the battery pack in the fully charged state and the standard resistance is greater than the second preset value, the first adjustment mode is activated to adjust the connection between the battery packs. 1 With V 0 For comparison, the detected R 1 With R 0 For comparison, if V 1 With V 0The absolute value of the difference is greater than the first preset value, or R 1 With R 0 If the difference is greater than the second preset value, and one of the above two conditions is met, it proves that oxidation has occurred at the connection points between the battery packs in the battery pack. At this time, the first adjustment mode can be started to adjust the connection between the battery packs to ensure that there is no oxidation at the connection points between the two battery packs in a battery pack.

[0052] S400: Obtain the real-time voltage, real-time resistance and temperature of each battery pack of the battery pack when it is in use; the real-time voltage of the battery pack when it is in use is defined as V a , the real resistance is defined as R a .

[0053] S500: Obtain the difference between the maximum and minimum voltages of the battery pack in a unit time; and obtain the variance of the temperature of each battery pack; if the voltage of the battery pack continues to change when in use, obtain a maximum voltage and a minimum voltage in a fixed time period, and calculate the difference between the maximum voltage and the minimum voltage, which is defined as ΔV a ; The temperature of each battery pack is obtained according to the temperature sensor set on each battery pack, the average temperature of the battery pack is calculated, and the temperature variance of the battery pack is calculated according to the average temperature of the battery pack.

[0054] S600: If the difference between the maximum voltage and the minimum voltage of the battery pack per unit time is greater than the third preset value, or the difference between the real-time resistance and the standard resistance is greater than the second preset value, or the variance of the temperature of each battery pack is greater than the variance of a new battery at the same temperature, the second adjustment mode is executed to adjust the connection between the battery packs. a For analysis, if ΔV a If the voltage is greater than the third preset value, it means that the voltage has changed greatly during this period of time, and the reason for the voltage change may be that the connection between the battery packs is loose. a With R 0 For comparison, in normal state, R a With R 0 The difference between R and R is very small. If oxidation occurs between the connection points of the battery pack, a With R 0 The difference gradually increases. Calculate the variance of the new battery at the same average temperature, and compare the variance of the new battery with the variance of the battery in use. If there is a difference, it proves that there is a temperature difference between the battery packs. The second adjustment mode can adjust the connection between the battery packs to ensure that the connection points of the two battery packs in a battery pack remain tight.

[0055] Furthermore, the first adjustment mode in step S300 includes:

[0056] S310: Push the connecting plates on the two adjacent battery packs to slide up and down. The up and down reciprocating motion of the connecting plates allows the connection points of the two battery packs to be fully polished, and the oxide layer between the two battery packs gradually disappears.

[0057] Furthermore, the second adjustment mode in step S600 includes:

[0058] S610: Push the connecting plates on the two adjacent battery packs upward or downward to slide. Push the connecting plates in one direction to ensure that the battery packs are connected more tightly and prevent the battery packs from being disconnected.

[0059] In combination with the above embodiments, the working process of the power battery pack provided in the first embodiment of the present invention is as follows:

[0060] During operation, the temperature sensors on each battery pack 110 are turned on to detect the temperature of each battery pack 110. First, before being put into use, the staff uses a multimeter to detect the rated voltage and rated resistance of the new battery pack, and calculates the temperature variance of the battery pack 110 at a specific average temperature.

[0061] The battery pack is then put into use. After a period of use, when the battery pack is fully charged, the staff uses a multimeter to measure the actual voltage and actual resistance of the battery pack, and compares the measured results with the rated voltage and rated resistance. If the difference between the actual voltage and the rated voltage in the fully charged state is greater than the first preset value, or if the difference between the actual resistance and the rated resistance in the fully charged state is greater than the second preset value, it proves that oxidation exists at the contact position between the connecting rod 120 and the conductive column 111. At this time, the staff drives the two connecting plates 130 to slide up and down, the length of the connecting rod 120 changes, and the connecting sleeve 160 and the conductive column 111 move relative to each other. Then, the second grinding strip 150 arranged on the inner wall of the connecting sleeve 160 grinds the outer peripheral wall of the conductive column 111, and the first grinding strip 140 arranged on the outer peripheral wall of the conductive column 111 grinds the inner wall of the connecting sleeve 160 to ensure that there is no oxide at the contact point between the connecting rod 120 and the conductive column 111, thereby increasing the conductivity between the connecting rod 120 and the conductive column 111.

[0062] After the battery pack is discharged, the actual voltage and actual resistance of the battery power source are detected in real time through a multimeter. First, the difference between the maximum voltage and the minimum voltage in a fixed time period is compared. If the difference between the maximum voltage and the minimum voltage in the fixed time period is greater than a third preset value, it proves that the connection between the battery packs 110 may be loose.

[0063] Secondly, the difference between the measured actual resistance and the rated resistance is compared. Under normal conditions, the difference between the measured actual resistance and the rated resistance is negligible. If the difference between the measured actual resistance and the rated resistance is greater than a second preset value, it proves that oxidation may have occurred at the connection point between the battery packs 110.

[0064] In addition, the data of the temperature sensors on each battery pack 110 are recorded, and the average temperature between each battery pack 110 is calculated. In the initial state, the temperature variance of the battery pack 110 is calculated at a certain average temperature for a new battery, and the specific average temperature is consistent with the average temperature measured by the temperature sensor at this time. The calculated variance is compared with the variance of the new battery. If the calculated variance is greater than the variance of the new battery, it proves that the battery pack 110 is partially overheated.

[0065] When at least one of the above three conditions is met, the connecting plate 130 is pushed continuously in one direction. In the process of pushing the connecting plate 130, the connecting rod 120 and the conductive column 111 move relative to each other. The second grinding strip 150 arranged on the inner wall of the connecting sleeve 160 grinds the outer peripheral wall of the conductive column 111. At the same time, the first grinding strip 140 arranged on the outer peripheral wall of the conductive column 111 grinds the inner wall of the connecting sleeve 160. According to the setting of the extrusion plate 210, the first inclined section 211 and the second inclined section 212 on the extrusion plate 210 squeeze the connecting rod 120. Since the middle diameter of the conductive column 111 is larger than the diameter at both ends, the inner diameter of the middle part of the connecting sleeve 160 is larger than the inner diameter at both ends. In the initial installation state, the position with the largest diameter of the conductive column 111 is located outside the connecting sleeve 160. After the first inclined section 211 and the second inclined section 212 squeeze the connecting rod 120, the connecting sleeve 160 on the connecting rod 120 abuts against the conductive column 111 more tightly.

[0066] Embodiment 2: The power battery pack provided in the embodiment of the present invention is different from the above-mentioned embodiment 1 in that the wires in the auxiliary board can be adjusted to connecting rods, wherein the connecting rods are arranged vertically at intervals to ensure that the connection mode of multiple battery cells is series connection.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power battery pack, characterized in that: including a battery unit and a connection unit; A plurality of battery cells are provided, and the plurality of battery cells are connected in series or in parallel; each battery cell includes at least two battery packs, and at least two battery packs are connected in series to form a battery cell, and the positive terminal and the negative terminal of each battery pack are fixedly provided with conductive columns; at least two battery packs in each battery cell are arranged in parallel and spaced apart; a plurality of connecting units are provided, and each connecting unit is provided corresponding to a battery cell, and each connecting unit includes a connecting rod and at least two connecting plates; each connecting plate is provided with a connecting hole, and the conductive column on each battery pack can pass through the connecting hole, and each connecting plate is installed at the positive terminal or the negative terminal of a battery pack, and the extreme ends of the connecting plates of two adjacent battery packs are opposite, and the two connecting plates on the two adjacent battery packs are connected by sliding up and down; the two ends of the connecting rod are respectively rotatably connected to the conductive columns, and the connecting rod can be telescopically arranged; A plurality of first grinding strips are arranged on the side wall of each conductive column, and the plurality of first grinding strips are evenly distributed around the circumference of the conductive column; Both ends of the connecting rod are fixedly connected with a connecting sleeve, which is rotatably sleeved on the outside of the conductive column, and a plurality of second grinding strips are arranged on the inner circumferential wall of the connecting sleeve, which are evenly distributed around the inner circumferential wall of the connecting sleeve.

2. The power battery pack according to claim 1, characterized in that: The middle diameter of the conductive column is larger than the diameters at both ends, and the inner diameter of the middle of the connecting sleeve is larger than the inner diameters at both ends. In the initial installation state, the position with the largest diameter of the conductive column is outside the connecting sleeve, and the inner circumferential wall of the connecting sleeve abuts against the outer circumferential wall of the conductive column.

3. The power battery pack according to claim 1, characterized in that: An extrusion plate is evenly and fixedly arranged on each connecting plate, and the extrusion plate always abuts against the middle part of the connecting rod. The extrusion plate has a first inclined section and a second inclined section, and the first inclined section and the second inclined section are spaced apart up and down. A vertical section is arranged between the first inclined section and the second inclined section, and the inclination directions of the first inclined section and the second inclined section are opposite. The first inclined section, the second inclined section and the vertical section form an expansion opening that opens to a side away from the battery pack. In the initial state, the connecting rod abuts against the vertical section.

4. The power battery pack according to claim 1, characterized in that: The connection unit also includes at least two auxiliary plates, each of which is provided with an auxiliary hole, through which the conductive column can pass; each auxiliary plate is installed on a battery pack, and the two auxiliary plates on two adjacent battery packs are connected by sliding up and down.

5. The power battery pack according to claim 1, characterized in that: Multiple battery cells are arranged in an array along the vertical direction, multiple auxiliary plates in the same vertical column of the multiple battery cells are fixedly connected, and multiple connecting plates in the same vertical column of the multiple battery cells are fixedly connected; wires are provided on the auxiliary plates, and the wires can connect the multiple battery cells in series or in parallel.

6. A power battery electrical connection system, characterized in that: A power battery pack comprising any one of claims 1 to 5, further comprising a control board, wherein the control board is capable of performing the following steps: S100: Obtaining a standard voltage and a standard resistance of a battery pack; S200: obtaining the voltage, resistance and temperature of the battery pack in a fully charged state; S300: if the absolute value of the difference between the voltage of the battery pack in a fully charged state and the standard voltage is greater than a first preset value, or the difference between the resistance of the battery pack in a fully charged state and the standard resistance is greater than a second preset value, then start the first adjustment mode to adjust the connection between the battery packs; wherein the first adjustment mode includes pushing the connection plates on the two adjacent battery packs to slide up and down reciprocatingly; S400: Obtaining the real-time voltage, real-time resistance and temperature of each battery pack of the battery pack in use; S500: Obtain the difference between the maximum voltage and the minimum voltage of the battery pack within a unit time; and obtain the variance of the temperature of each battery pack; S600: If the difference between the maximum and minimum voltages of the battery pack per unit time is greater than a third preset value, or the difference between the real-time resistance and the standard resistance is greater than a second preset value, or the variance of the temperatures of each battery pack is greater than the variance of a new battery at the same temperature, then a second adjustment mode is executed to adjust the connection between the battery packs, wherein the second adjustment mode includes pushing the connecting plates on two adjacent battery packs upward or downward to slide.

Images