Positioning auxiliary disassembly device, battery module, battery pack and electrical device

Abstract

The present application relates to the field of battery technology, and specifically discloses a positioning auxiliary disassembly device, a battery module, a battery pack and an electrical device; comprising: a positioning auxiliary disassembly device body comprising a cylindrical connecting portion arranged along an axial direction, a guide clamping portion and a drag reduction groove arranged around the connection between the cylindrical connecting portion and the guide clamping portion, wherein a cylinder wall of the positioning auxiliary disassembly device body is provided with an expansion notch along an axial direction from one end face of the guide clamping portion; the depth of the expansion notch abuts the cylindrical connecting portion, bolt holes are provided at the four corners of the heat dissipation pad at the bottom of the battery box, a sinking groove is provided coaxially with the threaded hole, the positioning auxiliary disassembly device is inserted into the sinking groove, bolt through holes are provided at the four corners of the end plates on both sides of the battery module, a positioning groove is provided coaxially at the bottom of the bolt through hole, a fixing bolt is inserted into the bolt through hole, and a card slot cooperating with the guide clamping portion is provided at one end of the threaded section of the fixing bolt. The device of the present application makes it easier to achieve one-time installation of the battery module and is more convenient to disassemble during maintenance.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a positioning and disassembly assistance device, a battery module, a battery pack, and an electrical device. Background Art

[0002] The battery pack of the prior art includes a battery case and a battery module disposed within the case. The battery case may be integrated with a liquid cooling plate, that is, the upper surface of the bottom of the battery case can exchange heat with the bottom surface of the module. To ensure heat transfer performance, a thermal pad or thermal conductive adhesive is usually provided between the battery module and the battery case / bottom liquid cooling plate. The thermal pad or thermal conductive adhesive is sticky and tightly bonded to the case after the module is assembled in place.

[0003] In order to improve the density efficiency of the battery pack, the gap between the battery module and the side wall of the battery box is small. At the same time, the adhesive effect of the thermal pad / thermal adhesive set at the bottom of the box requires a large operating force to separate the battery module from the box. Applying strong force by a crowbar device or crane / crane equipment to force the module to separate from the box is likely to damage the module or pose a safety risk. In addition, if auxiliary tools are used, due to the small gap between the battery module and the side of the box, it is difficult for the auxiliary tools to apply force at the right position to remove the module intact.

[0004] At the same time, the relevant technology requires the use of positioning tooling and robotic arms to install the battery module in the battery box in the correct position of the battery pack box at one time. If the placement position is not accurate at one time, the state of the thermal pad / thermal adhesive will be easily damaged when the battery module is adjusted horizontally. Summary of the Invention

[0005] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a positioning auxiliary disassembly device, a battery module, a battery pack and an electrical device.

[0006] In a first aspect, an embodiment of the present application provides a positioning and disassembly assisting device, the positioning and disassembly assisting device comprising:

[0007] The main body of the positioning and auxiliary disassembly device is cylindrical and includes a cylindrical connecting portion arranged along the axial direction, a guide clamping portion, and a drag-reducing groove arranged around the connection between the cylindrical connecting portion and the guide clamping portion, wherein the cylindrical wall of the positioning and auxiliary disassembly device body is provided with an expansion notch along the axial direction from one end face of the guide clamping portion; the depth of the expansion notch abuts the cylindrical connecting portion.

[0008] In one embodiment, the guide clamping portion includes a first conical guide surface provided on an outer surface and a second conical guide surface provided on an inner surface, the first conical guide surface and the second conical guide surface intersect at one end surface of the guide clamping portion, and the conical point where the conical surface on which the first conical guide surface extends and focuses is located on the central axis of the positioning auxiliary disassembly device body;

[0009] In one embodiment, a clamping protrusion is arranged around the inner surface of the guide clamping portion close to the second conical guide surface, and the clamping protrusion includes a first cylindrical surface and a second cylindrical surface arranged at one end of the first cylindrical surface. The distance from the first cylindrical surface to the center axis of the guide clamping portion is smaller than the distance from the second cylindrical surface to the center axis of the guide clamping portion.

[0010] In a second aspect, an embodiment of the present application further provides a battery module, the battery module comprising:

[0011] A module housing, comprising a rectangular bottom plate, two side plates arranged along the length direction of the sides of the rectangular bottom plate, and two end plates arranged along the width direction of the sides of the rectangular bottom plate, wherein the two side plates and the two end plates enclose a cavity, and the battery cells are arranged in an array in the cavity; and

[0012] A fixing plate is arranged on the outer surfaces of the two end plates, wherein the fixing plate is provided with a bolt through hole vertically passing through along the height direction of the end plate, the diameter of the bolt through hole is smaller than the outer circle diameter of the end face of the guide clamping part of the positioning auxiliary disassembly device as described in any of the above embodiments, and a fixing bolt is inserted into the bolt through hole.

[0013] In one embodiment, a positioning groove is coaxially provided at one end of the bolt through hole close to the rectangular bottom plate, and the diameter of the positioning groove is larger than the outer diameter of the cylindrical connecting portion of the positioning auxiliary disassembly device.

[0014] In one embodiment, the screw rod of the fixing bolt is respectively provided with a smooth portion and a threaded portion, the smooth portion is provided at one end close to the head of the fixing bolt, and a slot is provided around the connection between the smooth portion and the threaded portion, and the slot is used to couple with the snap-fit ​​protrusion of the positioning auxiliary disassembly device, wherein the length of the threaded portion along the axial direction is greater than the depth of the positioning slot.

[0015] In a third aspect, an embodiment of the present application further provides a battery pack, comprising:

[0016] The battery box comprises a bottom plate, two long side plates arranged along the length direction of the bottom plate side edges, and two short end plates arranged along the width direction of the rectangular bottom plate side edges, wherein the two long side plates and the two short end plates enclose a rectangular cavity; and

[0017] At least one thermal pad is disposed at the bottom of the rectangular cavity, wherein the bottom surface of the rectangular cavity near the four corners of the thermal pad is provided with a sunken groove, and the bottom surface of the sunken groove is coaxially provided with a threaded hole;

[0018] The positioning and disassembly assisting device as described in any of the above embodiments, wherein the positioning and disassembly assisting device is inserted into the sinking groove by interference fit;

[0019] The battery module as described in any of the above embodiments is arranged on the surface of each of the thermal pads, wherein the fixing bolts of the battery module pass through the positioning auxiliary device and are threadedly connected to the threaded holes.

[0020] In one embodiment, the diameter of the sinking groove is greater than the diameter of the threaded hole, and the depth of the threaded hole is greater than the depth of the positioning groove.

[0021] In one embodiment, the positioning auxiliary disassembly device is inserted into each of the sinking grooves by interference fit; or, the positioning auxiliary disassembly device is inserted into each of the sinking grooves at the diagonal positions of the thermal pad by interference fit.

[0022] In a fourth aspect, an embodiment of the present application further provides an electrical device, wherein the electrical device comprises a battery module as provided in any of the above embodiments, wherein the battery module is used to provide electrical energy; or

[0023] The electrical device includes a battery pack as provided in any of the above embodiments, and the battery pack is used to provide electrical energy.

[0024] One or more of the above technical solutions in the embodiments of the present application have at least the following technical effects or advantages:

[0025] The positioning auxiliary disassembly device provided in the embodiment of the present application is provided with a cylindrical connecting portion, a guide clamping portion and a drag-reducing groove. A clamping protrusion is provided in the guide clamping portion. When the guide clamping portion is squeezed outward from the center line, it can shrink and expand. By coaxially providing threaded holes and sunken grooves at the diagonal or four corners of the thermal pad in the battery case, the positioning auxiliary disassembly device is inserted into the sunken groove with an interference fit, and the battery module is assembled on the thermal pad. When assembling the battery module, it is only necessary to align the fixing bolts provided at the side ends of the battery module with the positioning auxiliary disassembly device. The positioning auxiliary disassembly device is provided with a second conical guide surface to make it easier to coaxially insert the fixing bolts into the positioning auxiliary disassembly device. Due to the provision of the positioning auxiliary disassembly device, the battery module can be placed in the correct position of the battery pack case at one time without the assistance of positioning tooling or a robotic arm, thereby improving installation efficiency and reducing the possibility of errors in the installation process.

[0026] At the same time, since the fixing bolt is provided with a card slot that couples with the card protrusion on the positioning auxiliary disassembly device, when the fixing bolt is tightened with the threaded hole of the battery case, due to the setting of the second conical guide surface, the card protrusion slides out of the card slot to the smooth part of the fixing bolt screw. At this time, the bottom of the battery module is stuck to the thermal pad. When the battery module needs to be disassembled, the fixing bolt is loosened. At this time, the positioning auxiliary disassembly device moves upward to the top and hits the bottom of the positioning slot. When the fixing bolt is loosened again, the card protrusion slides from the smooth part of the fixing bolt screw into the card slot. At this time, the engaging protrusion is coupled with the card slot and is stuck. When the fixing bolts are further loosened, the positioning auxiliary disassembly device pushes the battery module upward until the battery module is separated from the thermal pad of the box. Through the above arrangement, there is no need to use an additional crowbar device or crane / crane equipment to apply strong force to force the module to separate from the box, and the battery module will not be damaged. At the same time, disassembly is more convenient and the safety risk of the disassembly process is smaller. In addition, after the battery module is disassembled, the positioning auxiliary disassembly device on the fixing bolt screw can be removed and reused, which is more convenient for reinstallation after disassembly and maintenance.

[0027] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 is a schematic structural diagram of a battery pack according to an embodiment of the present application;

[0030] Figure 2 is a structural schematic diagram of a battery box according to an embodiment of the present application;

[0031] Figure 3 1 is a schematic structural diagram of a positioning auxiliary disassembly device according to an embodiment of the present application;

[0032] Figure 4 is a cross-sectional view of a positioning auxiliary disassembly device according to an embodiment of the present application;

[0033] Figure 5 is a top view of a battery module according to an embodiment of the present application;

[0034] Figure 6 is based on Figure 5 Cross-sectional view at the AA position;

[0035] Figure 7is a longitudinal partial cross-sectional view of a battery pack according to an embodiment of the present application;

[0036] Figure 8 is a partial cross-sectional view of the battery module installation process according to an embodiment of the present application;

[0037] Figure 9 is another partial cross-sectional view of the battery module installation process according to an embodiment of the present application;

[0038] Reference numerals:

[0039] 1. Battery pack; 11. Battery case; 111. Bottom plate; 1111. Threaded hole; 1112. Sink; 112. Short end plate; 113. Long side plate; 12. Battery module; 13. Upper cover; 14. Fastener; 15. Control module; 16. Cooling port; 17. High-voltage connector; 18. Low-voltage connector; 121. Fixing plate; 122. Bolt hole; 1221. Positioning slot; 123. Side plate; 124. End plate; 140. Fixing bolt; 141. Smooth portion; 142. Slot; 143. Threaded portion; 2. Thermal pad;

[0040] 3. Positioning auxiliary disassembly device; 31. Cylindrical connecting portion; 32. Drag reduction groove; 33. Guide clamping portion; 34. Expansion notch; 35. Inner cylindrical cavity; 331. First conical guide surface; 332. Second conical guide surface; 333. Clamping protrusion; 3331. First cylindrical surface; 3332. Second cylindrical surface. DETAILED DESCRIPTION

[0041] The embodiments of the present application are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] It should be noted that when an element is referred to as being “fixed to” another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intermediate element.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0044] With the continuous development of new energy vehicles, research in the field of battery-related technologies has become increasingly important. The structural optimization and efficiency performance of battery packs have become the focus of current battery research. In the process of realizing the technical solution of this application, the inventors found that in the battery pack assembly process in the related art, the battery module needs to be placed in the correct position of the battery box at one time with the assistance of positioning tooling and a robotic arm. Due to the small gap between the side panel of the battery box and the battery module, the installation process of the battery module with the assistance of positioning tooling and a robotic arm is complicated. At the same time, if the battery module is not installed in place at one time, the state of the thermal pad is easily damaged when the battery module is adjusted horizontally.

[0045] At the same time, when the battery pack is returned for repair or after-sales maintenance, since a thermal pad is provided between the bottom of the battery module and the battery case, the thermal pad acts as a sticky fixation for the battery module. When the battery module is disassembled, it is necessary to use a crowbar device or crane equipment to apply strong force to force the battery module to separate from the battery case. If the crowbar tool accidentally pierces the battery cell inside the module during this process, thermal runaway may be triggered. If a crane / trolley is used for disassembly, the equipment investment and site occupation are increased. During the lifting process, the module may collide with the side wall of the case and cause damage.

[0046] Based on this, in order to solve the technical problems in the related art that the installation and positioning process of the battery pack in the battery module is complicated and may result in inaccurate positioning, and the battery module is difficult to remove from the battery box during the disassembly process, the inventors proposed the following solution.

[0047] See also Figures 1 to 2 The embodiment of the present application provides a battery pack, wherein the battery pack 1 includes a battery box 11, a battery module 12, a positioning auxiliary disassembly device 3 and an upper box cover 13. Figure 1 As shown, four battery modules 12 are installed in parallel in an array along the length direction in the battery box 11. The electrodes of two adjacent battery modules 12 are in opposite directions. The battery modules 12 are fastened by multiple fixing bolts. A control module 15 is provided at one end of the electrode of the battery module 12. The control module 15 is electrically connected to the electrode of the battery module 12 and can be used to control the input and output power.

[0048] In one embodiment, a plurality of electrically connected battery cells are provided inside the battery module 12 for storing electrical energy or recharging. A cooling interface 16, a high-voltage connector 17 and a low-voltage connector 18 are provided on the outer surface of the end plate of the battery case 11 near the control module 15. The plurality of battery modules 12 are electrically connected through conductors and converged to the control module 15. The control module 15 is electrically connected to the high-voltage connector 17 and the low-voltage connector 18 respectively. The battery module 12 is discharged or charged to the outside through the high-voltage connector 17.

[0049] Preferably, an upper cover 13 is provided on the top of the battery case 11. A plurality of fixing holes are evenly arranged on the upper surface of the upper cover 13 along the side length. The upper cover 13 is detachably connected to the battery case 11 by a plurality of fasteners 14. The upper cover 13 is provided to protect the battery module 12 in the battery case 11.

[0050] In one embodiment, Figure 2 As shown, the battery box 11 is composed of a bottom plate 111 and a short end plate 112 arranged in the width direction of the edge of the bottom plate 111 and a long side plate 113 arranged in the length direction of the edge of the bottom plate 111. A plurality of thermal pads 2 are arranged in parallel in an array on the surface of the bottom plate 111 of the battery box 11. The upper surface area of ​​the thermal pad 2 can be set to be equal to the bottom surface area of ​​the battery module 12. The number of thermal pads 2 provided can be determined according to the number of battery modules 12 to be set in the battery box 11. A certain distance is reserved between the short sides of the thermal pad 2 and the inner surface of the battery box 11. A sinking groove 1112 is provided on the surface of the bottom plate 111 around the thermal pad 2, and a threaded hole 1111 is coaxially provided at the bottom of the sinking groove 1112. A positioning auxiliary disassembly device 3 is inserted in the sinking groove 1112 with an interference fit.

[0051] It should be noted that the positioning auxiliary disassembly device 3 does not necessarily need to be set in every threaded hole 1111. In some embodiments, by coaxially opening a sinking groove 1112 in the threaded hole 1111 at one diagonal point of the thermal pad 2, and not opening a sinking groove 1112 at another diagonal point of the thermal pad 2, and at the same time inserting a positioning auxiliary disassembly device 3 in the opened sinking groove 1112 with interference fit, the effect of setting the positioning auxiliary disassembly device 3 above all threaded holes 1111 can also be achieved. It should be understood that the sinking groove 1112 is a cylindrical hole groove, and the diameter of the sinking groove 1112 is larger than the diameter of the threaded hole 1111.

[0052] Of course, the gap between the battery module 12 and the bottom plate of the battery box 11 can also be filled with thermal conductive glue. The setting of the thermal conductive glue and the setting of the thermal pad 2 are both for better heat dissipation of the battery module 12, and at the same time can also achieve a certain fixing effect on the battery module 12; at the same time, a cooling flow channel is also provided inside the bottom plate 111 of the box, and the cooling flow channel is connected to the cooling interface 16. The battery module 12 will generate heat during the charging or discharging process, and the coolant is introduced from the cooling interface 16. The coolant further flows in the cooling flow channel to take away the heat of the battery module 12, thereby maintaining the temperature of the battery module 12 within an appropriate range.

[0053] Typically, the thermal pad 2 is applied to the bottom plate 111 of the battery box before the battery module 12 is assembled, and the thermal pad 4 is coated according to a preset shape / path. The battery module 12 needs to be placed in the correct position at one time during the assembly process to avoid squeezing the thermal pad 2 to a deviated position; the introduction of the positioning auxiliary device 3 can improve the positioning accuracy of the battery module 12, that is, the battery module 12 can be accurately installed without the assistance of a robotic arm / positioning tooling.

[0054] It can be understood that the provision of the threaded holes 1111 on the surface of the bottom plate 111 facilitates the reinforcement of the battery module 12 to prevent the battery pack from being squeezed and deformed, which may cause danger, when the battery pack vibrates violently. The provision of the positioning auxiliary disassembly device 3 is used to install the battery module 12 in the battery box 11. Without the assistance of positioning tooling and a robotic arm, the battery module 12 can be placed in the correct position of the battery pack box 11 at one time, thereby improving installation efficiency and reducing the possibility of errors during the installation process.

[0055] See also Figures 3 and 4 The embodiment of the present application also provides a positioning auxiliary disassembly device 3, which is applied to the battery pack 1 described above. The effects of the positioning auxiliary disassembly device 3 after being set include that the battery module can be placed in the correct position of the battery pack box at one time without the help of positioning tooling or robotic arms, thereby improving installation efficiency and reducing the possibility of errors in the installation process; and when repairing and disassembling the battery pack, there is no need to use an additional crowbar device or crane / crane equipment to apply strong force to force the module to separate from the box, which will not damage the battery module, and at the same time, disassembly is more convenient and the safety risk of the disassembly process is smaller; in addition, after the battery module is disassembled, the positioning auxiliary disassembly device on the fixing bolt screw can be removed and reused, which is more convenient for reinstallation after disassembly and repair.

[0056] Figure 3 The schematic diagram of the structure of the positioning auxiliary disassembly device 3 is shown. Figure 3The cam 32 is provided with a plurality of holes 322 for holding the cam 32 in a direction of rotation and the plurality of holes 324 are provided with a plurality of holes 326 for holding the cam 32 in a direction of rotation.

[0057] Alternatively, in one embodiment, please refer to Figure 3 The cylindrical wall of the positioning auxiliary disassembly device 3 is provided with an expansion notch 34 along the axial direction from one end face of the guide clamping portion 33; the opening depth of the expansion notch 34 abuts the cylindrical connecting portion 31. It can be understood that the setting of the expansion notch 34 divides the guide clamping portion 33 into two halves. When the bolt passes through the middle of the guide clamping portion 33, the setting of the expansion notch 34 makes the guide clamping portion 33 more likely to deform and accumulate elastic potential energy. At the same time, when the inner side wall of the guide clamping portion 33 is no longer subjected to the extrusion force, the setting of the expansion notch 34 can make the guide clamping portion 33 return to its undeformed shape.

[0058] It should be noted that the material for manufacturing the positioning and disassembly assisting device 3 can be a hard plastic with elasticity, such as elastic polyethylene plastic. The outer diameter of the cylindrical connecting portion 31 is slightly larger than the diameter of the sinking groove 1112. When the positioning and disassembly assisting device 3 is installed in the sinking groove 1112, the cylindrical connecting portion 31 and the sinking groove 1112 form an interference fit, which has a certain fixing effect on the positioning and disassembly assisting device 3.

[0059] It should also be noted that the depth of the expansion notch 34 exceeds the position of the drag reduction groove 32. At the same time, there is no limit on the number of expansion notches 34. For example, two expansion notches 34 are symmetrically opened on the guide clamping portion 33, or three expansion notches 34 are equidistantly opened along the circumference of the end face of the guide clamping portion 33. The expansion notches 34 are mainly provided to enable the guide clamping portion 33 to deform better along the radial direction.

[0060] In some embodiments, as Figure 4 As shown, Figure 4A cross-sectional view of the positioning and disassembly assisting device 3 is shown. The cylindrical connecting portion 31 is cylindrical. A first tapered guide surface 331 is provided on the outer surface of the guide clamping portion 33, extending from the drag reducing groove 32. The outer diameter of the first tapered guide surface 331 gradually decreases from the drag reducing groove 32 to the end face of the guide clamping portion 33. A second tapered guide surface 332 is provided at the corner between the end face and the inner circle of the guide clamping portion 33. The first tapered guide surface 331 and the second tapered guide surface 332 intersect to form an acute angle. The provision of the first tapered guide surface 331 and the second tapered guide surface 332 facilitates positioning of the battery module 12 during one-time installation and facilitates fixing with fixing bolts.

[0061] Exemplarily, the conical point where the conical surface where the first conical guide surface 331 extends and focuses is located on the central axis of the main body of the positioning auxiliary disassembly device 3. A clamping protrusion 333 is provided around the inner surface of the guide clamping portion 33 near the second conical guide surface 332. The clamping protrusion 333 includes a first cylindrical surface 3331 and a second cylindrical surface 3332 provided at one end of the first cylindrical surface 3331. The distance between the first cylindrical surface 3331 and the central axis of the guide clamping portion 33 is smaller than the distance between the second cylindrical surface 3332 and the central axis of the guide clamping portion 33. A step ring is formed at the connection between the first cylindrical surface 3331 and the second cylindrical surface 3332.

[0062] With this arrangement, when the fixing bolt passes through the central axis of the positioning auxiliary disassembly device 3, the guide clamping portion 33 is subjected to an outward squeezing force from the central axis, which can cause the structures at both ends of the expansion gap 34 to undergo uniform elastic deformation. The second conical guide surface 332 is convenient for guiding the bolt to pass through, and the clamping protrusion 333 is convenient for clamping into the clamping groove of the fixing bolt.

[0063] See also Figures 5 and 6 The present application also provides a battery module. The battery module 12 is installed in the battery pack 1 described above. The battery module 12 includes a rectangular bottom plate, two side plates 123 arranged along the length direction of the side edges of the rectangular bottom plate, and two end plates 124 arranged along the width direction of the side edges of the rectangular bottom plate. The two side plates 123 and the two end plates 124 enclose a battery accommodating cavity, and the battery cells are arranged in an array in the battery accommodating cavity.

[0064] For example, two fixing plates 121 are fixedly provided on the outer surfaces of the two end plates, respectively. The size of the fixing plates 121 can be set to be the same as that of the end plates 124. Two bolt through holes 122 are provided at both ends of the fixing plates 121 along the height direction of the battery module 12. The bolt through holes 122 are provided through the fixing plates 121.

[0065] In one embodiment, Figure 6As shown, a positioning groove 1221 is coaxially formed at the bottom of the bolt through hole 122, and a fixing bolt 140 is inserted into the bolt through hole 122 from top to bottom. The diameter of the bolt through hole 122 is larger than the diameter of the fixing bolt 140, and the bolt through hole 122 serves to limit the fixing bolt 140; the screw rod of the fixing bolt 140 is respectively provided with a smooth portion 141 and a threaded portion 143, the smooth portion 141 is provided near one end of the head of the fixing bolt 140, and a clamping groove 142 is formed around the connection between the smooth portion 141 and the threaded portion 143, and the clamping groove 142 is used to couple and clamp with the clamping protrusion 333 of the positioning auxiliary disassembly device 3;

[0066] It should be noted that the diameter of the circle formed by the first cylindrical surface 3331 of the engaging protrusion 333 is between the diameter of the smooth portion 141 of the fixing bolt 140 and the diameter of the circle formed by the bottom surface of the engaging groove 142. The threaded portion 143 is provided with a thread threadedly connected to the threaded hole 1111 provided on the bottom surface of the battery case 11. When the battery module 12 is installed in the battery case 11, the sinking groove 1112 and the positioning groove 1221 form a cylindrical cavity, wherein the length of the threaded portion 143 is greater than the height of the cylindrical cavity. This arrangement facilitates positioning the auxiliary disassembly device 3 to lift the battery module 12 during disassembly.

[0067] In one embodiment, Figure 7 As shown, Figure 7 The cross-sectional view of the battery module installation process is shown. The battery module 12 is threadedly connected to the bottom plate 111 of the battery box 11 by the fixing bolts 140. A thermal pad 2 is provided between the battery module 12 and the bottom plate 111. The fixing bolts 140 are rotated downward to fix. Since the center hole diameter of the positioning auxiliary disassembly device 3 is smaller than the diameter of the fixing bolts 140, the positioning auxiliary disassembly device 3 is subjected to an outward extrusion force from the axis, and the guide clamping portion 33 is deformed to accumulate elastic potential energy. When the clamping groove 142 on the fixing bolt 140 is just rotated to the clamping protrusion 333, the clamping protrusion 333 is coupled and clamped with the clamping groove 142 due to the elastic potential energy. At this time, the positioning auxiliary disassembly device 3 in the sinking groove 1112 is deformed, and the outer surface of its guide clamping portion 33 is in contact with the inner wall of the positioning groove 1221.

[0068] In one embodiment, see Figures 8 and 9 When installing the battery module 12, it is only necessary to align the positioning groove 1221 with the positioning auxiliary disassembly device 3. Due to the provision of the guide clamping portion 33, it is easier to install the battery module 12 in the correct position. The provision of the first conical guide surface 331 is conducive to guiding the positioning groove 1221 of the battery module 12 to align with the positioning auxiliary disassembly device 3. The upper diameter of the first conical guide surface 331 is smaller than the diameter of the bolt through hole 122 of the battery module 12, and the lower diameter of the first conical guide surface 331 is larger than the diameter of the bolt through hole 122 of the battery module 12.

[0069] Furthermore, the provision of the expansion notch 34 enables the guide clamping portion 33 to move in a direction away from the axis of the positioning auxiliary disassembly device 3 under the action of force. That is, the guide clamping portions 33 on both sides of the expansion notch 34 can open when subjected to force, so that the expansion notch 34 is enlarged, thereby causing the positioning auxiliary disassembly device 3 to accumulate elastic potential energy due to deformation. Figure 8 The diagram illustrates the movement of the fixing bolt 140 in the direction indicated by V1. The fixing bolt 140 aligns with the second tapered guide surface 332 and applies a downward pressure, causing the guide clamping portion 33 to expand. Furthermore, the fixing bolt 140, guided by the second tapered guide surface 332, can smoothly penetrate the positioning and disassembly assisting device 3. A clamping protrusion 333 is provided on the inner circumference of the guide clamping portion 33. The expansion notch 34 has a clamping / contracting resilience when opened. As the fixing bolt 140 penetrates the positioning and disassembly assisting device 3, the clamping protrusion 333 abuts the outer wall of the fixing bolt 140.

[0070] The locking cam 333 of the fixing bolt 140 is tightened to the position where the locking cam 333 of the fixing bolt 140 is tightened. Figure 7 The shown direction is V1. On the contrary, when the fixing bolt 140 moves in the opposite direction to the V1 direction, the positioning auxiliary disassembly device 3 will follow the fixing bolt 140.

[0071] In one embodiment, Figure 9 As shown, the threaded portion 143 of the fixing bolt 140 further engages with the threaded hole 1111 of the battery case 11, and rotating the fixing bolt 140 causes the fixing bolt 140 to further move along the V1 direction until the fixing bolt 140 presses the fixing plate 121 of the battery module 12; after the clamping protrusion 333 of the positioning auxiliary disassembly device 3 is coupled with the clamping groove 142 of the fixing bolt 140, the fixing bolt 140 moves along the V1 direction so that the clamping protrusion 333 is decoupled from the clamping groove 142, that is, the expansion notch 34 of the positioning auxiliary disassembly device 3 is changed from the tightened state to the open state again, and the clamping groove 142 of the fixing bolt 140 moves to the bottom of the clamping protrusion 333; at this time, the guide clamping portion 33 has a clamping / contracting rebound force after opening, and the clamping protrusion 333 fits the outer wall of the fixing bolt 140.

[0072] It is also understandable that, continue to refer to Figure 9To remove the battery module 12 from the battery box 11, it is necessary to remove multiple fixing bolts 140, that is, to rotate the fixing bolts 140 in the opposite direction to that indicated by V1 by using a tightening tool; the locking groove 142 of the fixing bolt 140 gradually moves from below the locking protrusion 333 to coincide with the locking protrusion 333, and after the guide clamping portion 33 is opened, the clamping / contraction rebound force causes the locking protrusion 333 to move into the locking groove 142 of the fixing bolt 140. At this time, the guide clamping portion 33 of the positioning auxiliary disassembly device 3 changes from the open state to the tightened state, and the locking protrusion 333 of the positioning auxiliary disassembly device 3 is coupled with the locking groove 142 of the fixing bolt 140 again;

[0073] Furthermore, as the fixing bolt 140 further moves in the opposite direction to that indicated by V1, the fixing bolt 140 drives the positioning auxiliary disassembly device 3 to move in the opposite direction to that indicated by V1, that is, during the movement of the fixing bolt 140, the positioning auxiliary disassembly device 3 is partially pulled out of the sunken groove 1112 on the bottom plate 111 of the box body; before the first conical guide surface 331 of the positioning auxiliary disassembly device 3 is limited by the bolt through hole 122 of the end plate 124, the positioning auxiliary disassembly device 3 moves relative to the fixing plate 121 in the opposite direction to that indicated by V1. Since the upper diameter of the second conical guide surface 332 is smaller than the diameter of the bolt through hole 122 of the battery module 12, and the lower diameter D1 of the second conical guide surface 332 is larger than the diameter of the bolt through hole 122 of the module 12, the positioning auxiliary disassembly device 3 cannot pass through the bolt through hole 122;

[0074] It should be noted that the engagement length between the fixing bolt 140 and the threaded hole 1111 is K3, and preferably, K3 is 3~5mm. After the second conical guide surface 332 of the positioning auxiliary disassembly device 3 is limited by the bolt through hole 122 of the end plate 124, the positioning auxiliary disassembly device 3 further follows the fixing bolt 140 and moves in the opposite direction shown by V1. The positioning auxiliary disassembly device 3 simultaneously drives the battery module 12 to move synchronously along the opposite direction shown by V1, that is, the process of the tightening tool rotating the fixing bolt 140 in the opposite direction synchronously drives the fixing plate 121 of the module 12 to separate from the bottom plate 111 of the box body. The fixing bolt 140 is equivalent to a screw jack applying force to the fixing plate 121, so that the battery module 12 overcomes the adhesive force of the thermal pad 2 and separates from the bottom plate 111 of the box body. The driving force comes from the tightening tool, and no other auxiliary tools are needed to continue disassembly. The disassembly of the battery module 12 is more convenient and the disassembly efficiency of the battery module 12 is higher.

[0075] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the invention.

[0076] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0077] Obviously, the described embodiments are only some of the embodiments of the present application, rather than all of the embodiments. Mentioning "embodiment" in this article means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present embodiment application. The appearance of this phrase in various positions in the specification does not necessarily mean that they are all the same embodiments, nor are they independent or alternative embodiments that are mutually exclusive with other embodiments. It can be understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0078] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: The battery box comprises a bottom plate, two long side plates arranged along the length direction of the bottom plate side edges, and two short end plates arranged along the width direction of the rectangular bottom plate side edges, wherein the two long side plates and the two short end plates enclose a rectangular cavity; as well as At least one thermal pad is disposed at the bottom of the rectangular cavity, wherein the bottom surface of the rectangular cavity near the four corners of the thermal pad is provided with a sunken groove, and the bottom surface of the sunken groove is coaxially provided with a threaded hole; A positioning auxiliary disassembly device, the positioning auxiliary disassembly device is inserted into the sinking groove with an interference fit; A battery module, wherein the battery module is disposed on the surface of each thermal pad, the module housing comprising a rectangular bottom plate, two side plates disposed along the length direction of the rectangular bottom plate, and two end plates disposed along the width direction of the rectangular bottom plate, the two side plates and the two end plates enclosing a cavity, wherein battery cells are arrayed in the cavity; and A fixing plate is provided on the outer surface of the two end plates, wherein the fixing plate is provided with a bolt through hole vertically extending along the height direction of the end plates, the diameter of the bolt through hole is smaller than the outer diameter of the end surface of the guide clamping portion of the positioning auxiliary disassembly device, and a fixing bolt is inserted into the bolt through hole; Wherein, the fixing bolt passes through the positioning auxiliary disassembly device and is threadedly connected to the threaded hole.

2. The battery pack according to claim 1, wherein: The positioning auxiliary disassembly device includes: The main body of the positioning and auxiliary disassembly device is cylindrical and includes a cylindrical connecting portion arranged along the axial direction, a guide clamping portion, and a drag-reducing groove arranged around the connection between the cylindrical connecting portion and the guide clamping portion, wherein the cylindrical wall of the positioning and auxiliary disassembly device body is provided with an expansion notch along the axial direction from one end face of the guide clamping portion; the depth of the expansion notch abuts the cylindrical connecting portion.

3. The battery pack according to claim 2, wherein: The guide clamping portion includes a first conical guide surface arranged on the outer surface and a second conical guide surface arranged on the inner surface. The first conical guide surface and the second conical guide surface intersect at one end face of the guide clamping portion. The conical point where the conical surface where the first conical guide surface is located extends and focuses is located on the central axis of the positioning auxiliary disassembly device body.

4. The battery pack according to claim 3, wherein: A clamping protrusion is arranged around the inner surface of the guide clamping portion close to the second conical guide surface, and the clamping protrusion includes a first cylindrical surface and a second cylindrical surface arranged at one end of the first cylindrical surface. The distance from the first cylindrical surface to the central axis of the guide clamping portion is smaller than the distance from the second cylindrical surface to the central axis of the guide clamping portion.

5. The battery pack according to claim 1, wherein: A positioning groove is coaxially provided at one end of the bolt through hole close to the rectangular bottom plate, and the diameter of the positioning groove is larger than the outer diameter of the cylindrical connecting portion of the positioning auxiliary disassembly device.

6. The battery pack according to claim 1, wherein: The fixing bolt includes a smooth portion, a threaded portion, and a slot arranged at the connection between the smooth portion and the threaded portion. The smooth portion is arranged near one end of the fixing bolt head. The slot is used to couple with the clamping protrusion of the positioning auxiliary disassembly device, wherein the length of the threaded portion along the axial direction is greater than the depth of the positioning slot.

7. The battery pack according to claim 1, wherein: The diameter of the sinking groove is greater than the diameter length of the threaded hole, and the depth of the threaded hole is greater than the depth of the positioning groove.

8. The battery pack according to claim 1, wherein: The positioning auxiliary disassembly device is inserted into each of the sinking grooves by interference fit; or The positioning auxiliary disassembly device is inserted into the sinking groove at the diagonal position of each thermal pad by interference fit.

9. An electrical device, characterized in that: The electrical device comprises the battery pack according to any one of claims 1 to 8, and the battery pack is used to provide electrical energy.

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