Battery module protection device base, protection device, end plate, battery pack

Abstract

This invention relates to a base, protective device, end plate, and battery pack for a battery module protective device. The base is used to cooperate with a protective cover to form a protective device that can provide insulation protection for the output terminal of the battery module. The output terminal of the battery module and the base can be inserted by a fixing member. The base includes a cover fitting seat, within which a fixing member is provided. The fixing member is limited in the horizontal direction by the cover fitting seat and can move upward relative to the cover fitting seat. The fixing member has a threaded hole for threaded connection with the fixing member. When the fixing member abuts against the output terminal of the battery module, and the fixing member is inserted into the fixing member and rotates along its own axis at a fixed height, the fixing member can apply a force to the cover fitting seat by means of its threaded connection with the fixing member, and moves upward relative to the cover fitting seat under the action of the reaction force applied by the cover fitting seat.

Description

Technical Field

[0001] This invention relates to the field of battery pack manufacturing, specifically to a base, protective device, end plate, and battery pack for a battery module protective device. Background Technology

[0002] The smallest unit in a power battery system is the battery cell. Several battery cells can form a battery module, and several battery modules can form a battery pack.

[0003] A battery module typically includes multiple busbars, multiple battery cells, and a pair of end plates. The end plates are located outside the battery cells at the ends of the battery module. Metal busbars are welded to the positive and negative terminals of the battery cells, and the battery cells are electrically connected to each other via the busbars. On the battery cell closest to the end plate, at least one busbar protrudes from the cell. The protruding part of the busbar extends to the location of the end plate and is electrically connected to one end of a strip-shaped copper busbar to form the output terminal of the battery module. At the same time, the other end of the strip-shaped copper busbar is used to electrically connect to the busbars in other battery modules, thereby establishing the electrical connection relationship between battery modules.

[0004] In related technologies, since both the busbar and the copper busbar are conductors and belong to high-voltage devices, a protective device mainly made of insulating material (such as plastic) is provided at the connection between the two. This protective device can cover the outside of the connection between the busbar and the copper busbar to provide insulation protection for the connection, and can also provide a support platform for the connection between the busbar and the copper busbar. After the protective device is assembled with the busbar and the copper busbar, the busbar and the copper busbar are both inserted into the protective device and have a part of the structure that extends into the protective device and a part of the structure that extends out of the protective device.

[0005] As described above, the protective device generally includes a detachable protective cover and a base. The base has a fixed fitting embedded in it that can be threadedly connected to fasteners such as bolts. When the protective cover is connected to the base, the protective cover covers the outside of the connection between the guide bus and the copper bus, while the base provides a support platform for the connection between the guide bus and the copper bus. The assembly steps of the guide bus, copper bus, and base typically include: extending the guide bus onto the base and fitting it against the base; stacking the copper bus on this part of the guide bus; inserting fasteners such as bolts into the copper bus, guide bus, and fixed fitting sequentially from top to bottom and tightening them, so that the fasteners are threadedly connected to the copper bus, guide bus, and fixed fitting at different points on their own, thereby ensuring that the connection between the copper bus and the guide bus is located inside the protective device and is covered by the protective device. In these assembly steps, ensuring that the busbar fits snugly against the base ensures that the busbar will not undergo unacceptable deformation during the tightening of the fasteners; and ensuring a tight and secure connection between the busbar and the busbar by tightening the fasteners, thereby guaranteeing the reliability of the assembly connection between the busbar and the busbar, is a critical point in the battery pack assembly process.

[0006] Therefore, the disadvantage of this arrangement is that, since the fixed mating parts are usually fixed on the base by methods such as insert injection molding, the position of the fixed mating parts in the base is fixed. When the guide busbar cannot fit well with the fixed mating parts due to the manufacturing tolerances of the parts and the cumulative tolerances of the assembly, this arrangement can easily cause difficulties in assembling the guide busbar and the copper busbar, and affect the reliability of the assembly connection between the guide busbar and the copper busbar.

[0007] A more detailed description is that in related technologies, the portion of the busbar protruding from the battery cell is typically short. When the busbar can extend onto the base but cannot fit well with it, leaving a gap of millimeters (e.g., 1-3 mm), if the assembly steps of the copper busbar, busbar, and base are performed as usual, workers need to exert more force to tighten the fasteners and deform the copper busbar and busbar until they fit against the upper surface of the fastener. This undoubtedly increases the difficulty of assembly. Secondly, after the fasteners are tightened, the busbar, due to its short protruding portion and the fact that it is bent from a suspended state, will be under significant internal stress for a long time. This state affects the reliability of the assembly connection between the copper busbar and the busbar. Summary of the Invention

[0008] Based on this, the purpose of the present invention is to provide a base, a protective device, an end plate, and a battery pack for a battery module protection device. The fixing fitting in the base for cooperating with the fixing fitting can float upward within the base, thereby ensuring that the guide tube does not undergo unacceptable deformation when the fixing fitting is tightened.

[0009] The present invention provides a base for a battery module protective device, which cooperates with a protective cover to form a protective device that can provide insulation protection for the output terminal of the battery module. The output terminal of the battery module and the base can be inserted by a fixing member. The base includes a cover fitting seat, and a fixing fitting member is provided inside the cover fitting seat. The fixing fitting member is limited in the horizontal direction by the cover fitting seat and can move upward relative to the cover fitting seat. The fixing fitting member is provided with a threaded hole for threaded connection with the fixing member. When the fixing member abuts against the output terminal of the battery module, and the fixing member is inserted into the fixing fitting member and rotates along its own axis at a fixed height, the fixing fitting member can apply a force to the cover fitting seat by means of the threaded connection between it and the fixing member, and move upward relative to the cover fitting seat under the action of the reaction force applied by the cover fitting seat.

[0010] Optionally, the screw hole is arranged in the vertical direction, and the cover fitting seat is provided with a receiving groove that can accommodate the cover fitting seat; the base also includes a limiting member, which is disposed on the cover fitting seat and can be engaged with the fixing fitting member to limit the upward movement stroke of the fixing fitting member; the battery module output terminal includes a guide bus, and the upward movement stroke of the fixing fitting member is configured to abut against the guide bus.

[0011] Optionally, the receiving groove includes a groove body, and a plurality of ribs are formed extending from the inner wall of the groove body toward the center of the groove body. The ribs are spaced apart from each other, and the plurality of ribs form a structure that can limit the fixing member in the horizontal direction.

[0012] Optionally, the limiting member includes a pin handle and a pin rod connected to each other. The pin rod extends horizontally. The cover fitting seat has a fitting inlet communicating with the receiving groove and an insertion hole located on one side of the fixed fitting member. The fixed fitting member has an elongated hole that extends horizontally through it. The pin handle can engage with the fitting inlet, and the pin rod can extend through the fitting inlet into the elongated hole and engage with the insertion hole, so that the fixed fitting member can move up and down relative to the cover fitting seat and cannot be dislodged from the cover fitting seat.

[0013] Optionally, the receiving groove can form an opening on the cover fitting seat, which is used for the fixing fitting to be inserted into the cover fitting seat in the horizontal direction; the fixing fitting includes at least two screw units, and a mating groove is provided between the screw units relative to the screw units. The screw units are provided with the screw holes, and the cover fitting seat is provided with mating holes through which the screw units can pass. The mating holes are arranged in the vertical direction and communicate with the receiving groove, and the limiting member is provided between the mating holes. The limiting member can cooperate with the mating groove; the mating holes and the limiting member cooperate to lock the fixing fitting in the horizontal direction.

[0014] Optionally, it also includes a plug, the plug comprising an interconnected plate-like portion and a closing portion, the plate-like portion being located below the fixing member, and the closing portion being capable of closing the opening on the cover fitting seat into which the fixing member is inserted.

[0015] Optionally, the receiving groove has a convex cross-section, the fixing member has a convex cross-section, the fixing member includes a body and a flange protruding outward from the lower front and rear surfaces of the body; there is a third gap between the bottom wall of the fitting groove and the bottom surface of the limiting member, and there is a fourth gap between the top surface of the flange and the receiving groove, the smaller of the third gap and the fourth gap in the vertical direction is the stroke of the fixing member that can move upward.

[0016] The present invention also provides a protective device, including a base for a battery module protective device as described in any of the preceding claims.

[0017] The present invention also provides an end plate, which is integrated with the base of the battery module protection device described in any of the above claims.

[0018] The present invention also provides a battery pack, including a base for the battery module protection device as described above.

[0019] In summary, by limiting the horizontal movement of the fixing component within the base while simultaneously allowing it to move upwards, this invention provides a base for a battery module protection device. The base includes a cover fitting and a fixing component disposed within the cover fitting. Given a gap between the guide busbar and the cover fitting due to tolerances, when the cover fitting is assembled with the fixing component and the guide busbar, the fixing component can float upwards relative to the cover fitting and abut against the guide busbar. This prevents the guide busbar from deforming due to tightening the fixing component, thus avoiding unacceptable assembly stress. The base ensures reliable assembly connection between the copper busbar and the guide busbar.

[0020] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the battery module, its protective device, and the copper busbar in Embodiment 1 of the present invention.

[0022] Figure 2 This is a schematic diagram of the protective cover in Embodiment 1 of the present invention.

[0023] Figure 3 This is a schematic diagram of the guide tube, fixing component, end plate and its upper base in Embodiment 1 of the present invention.

[0024] Figure 4 This is a partial structural diagram of the end plate in Embodiment 1 of the present invention.

[0025] Figure 5 This is a schematic diagram of the fixed fitting component before it moves upward in Embodiment 1 of the present invention.

[0026] Figure 6 This is a schematic diagram of the fixed fitting component after it moves upward in Embodiment 1 of the present invention.

[0027] Figure 7 This is a schematic diagram of the fastener, cover mating seat and limiting member after they are mated in Embodiment 1 of the present invention.

[0028] Figure 8 This is a schematic diagram of the locking mechanism and the cover fitting seat in Embodiment 1 of the present invention.

[0029] Figure 9 This is a schematic diagram of the plug, the fixing fitting, and the cover fitting seat in Embodiment 2 of the present invention.

[0030] Figure 10 This is a schematic diagram of the fixing member being inserted into the cover fitting seat and then passed into the fitting hole in Embodiment 2 of the present invention.

[0031] Figure 11 This is a schematic diagram of the plug and cover mating seat in Embodiment 2 of the present invention.

[0032] Figure 12 This is a schematic diagram of the plug and the cover fitting seat after they are fitted together in Embodiment 2 of the present invention.

[0033] Figure 13 This is a top view of the plug, cover mating seat, and fixing mating part assembled in Embodiment 2 of the present invention.

[0034] Figure 14 This is a cross-sectional view AA in Embodiment 2 of the present invention.

[0035] Figure 15 This is a BB cross-sectional view in Embodiment 2 of the present invention.

[0036] Explanation of reference numerals in the attached figures

[0037] I-current busbar, II-battery cell, III-copper busbar;

[0038] 1-End plate, 11-Insertion groove, 2-Protective cover, 21-First main body, 22-Side wall, 221-Snap fastener;

[0039] 3-Base, 31-Cover mating seat, 310-Snap-fit ​​edge, 311-Receiving groove, 3111-Groove body, 3112-Rib, 3113-Matching hole, 312-Insertion hole, 313-Matching inlet, 3131-Contour turning part, 32-Cover mating part, 320-Support plate, 33-Plug, 331-Plate-shaped part, 332-Closing part, 3321-Snap-fit ​​part;

[0040] 4-Fixed component, 5-Fixed mating component, 50-Threaded hole, 51-Elongated hole, 52-Body, 521-Matching groove, 522-Threaded unit, 53-Flange;

[0041] 6-Limiting component, 60-Pin rod, 61-Pin handle, 611-Fastening part;

[0042] 7 - First gap, 8 - Second gap, 9 - Third gap, 10 - Fourth gap. Detailed Implementation

[0043] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0044] The terms "first," "second," etc., used in the specification and claims of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0045] Example 1

[0046] like Figure 1 and Figure 2 As shown, this embodiment provides a battery pack containing multiple generally rectangular battery modules. Each battery module includes a current guide I, a cell II, and an end plate 1. The cell II is located at the end of the battery module, and the end plate 1 is located outside the cell II and is a plastic product obtained by injection molding. On the lower part of the cell II, the current guide I has a portion protruding to the right side of the cell II. This portion is used to electrically connect with one end of a strip-shaped copper busbar III to form the output electrode of the battery module. The copper busbar III extends in the left-right direction, and its other end is used to electrically connect with another battery module, thereby establishing an electrical connection relationship between the battery modules. With the side surface of end plate 1 away from cell II as its outer surface, the battery pack also includes a protective device corresponding to end plate 1. The protective device includes a protective cover 2 and a base 3. The base 3 includes a cover mating seat 31 and a cover mating part 32 integrally formed with end plate 1 by injection molding. The cover mating part 32 is located above the cover mating seat 31. The cover mating seat 31 and the cover mating part 32 extend to the right from different positions in the middle of the outer surface of end plate 1.

[0047] Furthermore, in this embodiment, the middle of the front end and the middle of the rear end of the cover fitting seat 31 are as follows: Figure 3 The cover 2 is recessed relative to its upper front and upper rear ends, respectively, so that a snap-fit ​​flange 310 extending in the left-right direction is formed on the upper front and upper rear ends of the cover mating seat 31; correspondingly, the protective cover 2 includes Figure 2The first main body 21 and the side walls 22 shown in [Figure 0], the first main body 21 is a horizontally arranged convex-shaped plate member, and the two side walls 22 are respectively formed by folding down from the front and rear end edges of the first main body 21. The side walls 22 are used to block the front and rear sides of the copper row III, so that the protection device has no front and rear openings, thereby ensuring its insulation protection. In this embodiment, a buckle portion 221大致为“乚”字型 is provided at the lower edge of the side wall 22. The hook-shaped chuck of the buckle portion 221 protrudes from the lower edge of the side wall 22, and the buckle portions 221 on the two side walls 22 are arranged oppositely, and can be respectively clamped and tightly fitted with the clamping edges 310 located at the front and rear ends of the cover fitting seat 31, so as to ensure that the protection cover 2 cannot move upward and make it difficult for the protection cover 2 to move horizontally. Further, the cover fitting portion 32 includes a support plate 320 protruding rightward from the outer surface of the end plate 1. The left end of the convex-shaped first main body 21 is the end with a smaller width, and the left end of the first main body 21 can extend onto the support plate 320 and rest on the support plate 320, so that the first protection cover 2 is supported by the cover fitting portion 32 and cannot move downward. Optionally, a protruding structure or a buckle structure (not shown in the figure) can also be provided on the first protection cover 2, and corresponding through holes (not shown in the figure) can be provided on the support plate 320, so that the protruding structure or the buckle structure can be clamped with the through holes, thereby more reliably realizing the horizontal limit of the first protection cover 2.

[0048] Please refer to Figure 1 and Figure 3 In this embodiment, a placement groove 11 for the diversion row I to extend into is provided on the end plate 1. The placement groove 11 is located on the left side of the cover fitting seat 31 and below the cover fitting portion 32, and has a U-shaped cross-section with an upward opening, and at the same time leads to the space between the cover fitting seat 31 and the cover fitting portion 32; correspondingly, the diversion row I has a direction of turning backward from the right part of the front surface of the battery cell II into the placement groove 11, and finally extending upward to reach the space between the cover fitting portion 32 and the cover fitting seat 31, and then extending rightward to reach above the cover fitting seat 31; further, a fixed fitting 5 for threadedly connecting with a fixing member 4 (a bolt in this embodiment) is placed inside the cover fitting seat 31. The fixing member 4 is used to sequentially penetrate through the copper row III, the diversion row I and the fixed fitting 5 to fix the copper row III and the diversion row I together; the fixed fitting 4, the diversion row I, the end plate 1 and the copper row III have the following assembly sequence:

[0049] S1: The fixed fitting 5 is placed into the cover fitting seat 31;

[0050] S2: The end plate 1 integrated with the base 3 is installed on the outside of the battery cell II at the outermost end of the battery module;

[0051] S3: The diversion row I is fitted with the placement groove 11 and welded to the battery cell II;

[0052] S4: One end of the copper busbar III covers the portion of the guide busbar I that extends above the cover mating seat 31.

[0053] In this way, the fixing component 4 is then inserted into the copper busbar III, the guide busbar I and the fixing fitting component 5 in sequence, so that the base 3 and the protective cover 2 with the corresponding structure can be detachably connected, thus forming a protective device that can lead out the copper busbar III to the right.

[0054] Specifically, in this embodiment, the fixing component 5 is a cuboid block separately disposed from the cover mounting base 31. The length of the fixing component 5 is arranged along the front-to-back direction, and its front and rear ends are respectively provided with threaded holes 50 that penetrate it in the vertical direction to achieve threaded connection with the fixing component 4. Correspondingly, the cover mounting base 31 is provided with a receiving groove 311 formed by a downward indentation from its upper surface. The receiving groove 311 includes a groove body 3111, which can accommodate the fixing component 5 and its height is slightly higher than that of the fixing component 5; for example Figure 4 As shown, the groove body 3111 is provided with a plurality of strip-shaped ribs 3112 that protrude inward from its inner wall. These strip-shaped ribs 3112 can form a space for the fixed fitting 5 to be inserted, so that the fixed fitting 5 is limited in the horizontal direction in the cover fitting seat 31, but can move upward.

[0055] Therefore, when the guide vane I can extend onto the cover mating seat 31 due to manufacturing tolerances and cumulative assembly tolerances, it cannot properly fit with the upper surface of the cover mating seat 31. For example, there may be a gap between the guide vane I and the upper surface of the cover mating seat 31. Figure 5 When the first gap 7 is shown, first place the fixing component 5 inside the tank body 3111, assemble the end plate 1 and the guide bus I, so that the guide bus I extends onto the cover mating seat 31, then cover the guide bus III onto the guide bus I, and screw the fixing component 4 into the copper bus III, the guide bus I and the fixing component 5 in sequence from top to bottom. When the fixing component 4 is about to be tightened, the fixing component 4 has a part that extends into the fixing component 5 and a part that is exposed between the fixing component 5 and the guide bus I; thereafter, since the fixing component 5 can float upward, and the guide bus I, as a metal product, has a certain strength, continue to screw the fixing component 4 (at this time, the fixing component 4 is equivalent to rotating along its axis at a certain height). Before the guide bus I deforms, the part of the fixing component 4 that has previously extended into the fixing component 5 will exert force on the fixing component 5, so that the fixing component 5 and the protruding rib 3112 generate action and reaction forces, thereby causing the fixing component 5 to move upward, as shown. Figure 6 The ground is positioned to abut against the guide tube I, which not only prevents the guide tube I from deforming but also completes the tightening of the fastener 4.

[0056] A more detailed description is that, since the external thread on the fastener 4 engages with the internal thread in the threaded hole 50, when the fastener 4 is tightened, the torsional force is transmitted through the fastener 4 (the part of the structure already threadedly connected to the fastening fitting 5) to the fastening fitting 5, and then to the cover fitting seat 31 that limits the fastening fitting 5 in the horizontal direction. This generates action and reaction forces between the fastening fitting 5 and the cover fitting seat 31, causing the fastening fitting 5 to move upward under the action of the reaction force, such as... Figure 6 The fastener 4 is tightened by abutting against the guide busbar I, ensuring that the guide busbar I does not undergo unacceptable deformation during the process, and that the guide busbar I is securely connected to the copper busbar III by the fastener 4. Subsequently, the fastening fitting 5, due to its threaded connection with the fastener 4, maintains a fixed height in the vertical direction, essentially "suspended" below the guide busbar I. It should be noted that because the guide busbar I possesses a certain strength, this "suspended" arrangement of the fastening fitting 5 below the guide busbar I will not cause significant deformation of the guide busbar I, nor will it result in excessive internal stress, thus affecting the reliability of the assembly connection between the guide busbar I and the copper busbar III. Conversely, because the fastening fitting 5 floats upward and absorbs the tolerances formed during the manufacturing and assembly of the guide busbar I, the guide busbar I will not deform during assembly, ensuring the overall lifespan and assembly reliability of the guide busbar I and the copper busbar III.

[0057] It should also be noted that the reason for using the protruding rib 3112 to engage with the fixed fitting 5 is that, compared to the solution where the fixed fitting 5 needs to engage with the inner wall of the entire groove body 3111, the protruding rib 3112 reduces the number of parts on the cover fitting seat 31 that need to engage with the fixed fitting 5, which can relax the production requirements of the base 3 to a certain extent and reduce the number of defective injection molded products. Of course, those skilled in the art can choose not to use the protruding rib 3112 according to their own needs, and instead directly engage the fixed fitting 5 with the inner wall of the groove body 3111.

[0058] For further information, please refer back to [link / reference]. Figure 3 and Figure 4Before assembling the fixing component 5 with the copper busbar III and the guide busbar I, the fixing component 5 needs to be placed in the cover fitting seat 31. To ensure that the fixing component 5 will not come out of the receiving groove 311 during transfer or transportation, the fixing component 5 in this embodiment is provided with an elongated hole 51 extending through it in the left-right direction. The right middle part of the cover fitting seat 31 is provided with a fitting inlet 313 leading to the receiving groove 311, and the left middle part of the cover fitting seat 31 is provided with a fitting inlet 313 extending through it in the left-right direction. The base 3 also includes a retaining member 6, which includes an integrally formed pin 60 and a pin handle 61. The pin handle 61 is located on the right side of the pin 60. The pin 60 extends horizontally to the left from the pin handle 61. The pin handle 61 can engage with the mating inlet 313. The pin 60 can pass through the elongated hole 51 and the insert 312 sequentially from right to left, thereby ensuring that the upward movement of the fixed mating member 5 is limited and that the fixed mating member 5 will not fall out of the receiving groove 311.

[0059] More specifically, the pin 60 and the insertion hole 312 have circular cross-sections, while the elongated hole 51 is an elongated hole with a width smaller than that of the pin shank 61. The pin 60 and the elongated hole 51 are engaged in the front-to-back direction, and the pin 60 and the insertion hole 312 are also interference-fitted to fix the limiting member 6 onto the cover mating seat 31. Figure 5 As shown, when the fixing component 5 is placed in the receiving groove 311 and naturally contacts the bottom wall of the groove body 3111 under the action of gravity, the pin 60 is located at the uppermost end of the elongated hole 51 and contacts the upper edge of the elongated hole 51; as Figure 6 As shown, after the fixed fitting 5 has moved upward, there is a distance between the pin 60 and the upper and lower edges of the elongated hole 51.

[0060] Please refer to further information. Figure 7 and Figure 8 In this embodiment, the pin handle 61 is also provided with a fastening part 611 that protrudes outward from the side surface of the pin handle 61. Correspondingly, an L-shaped contour turning part 3131 is provided on the area where the mating inlet 313 meets the receiving groove 311. The fastening part 611 can engage with the contour turning part 3131, thereby further ensuring the reliability of the connection between the pin handle 61 and the cover mating seat 31.

[0061] Optionally, the base 3 can also be set separately from the end plate 1. When the base 3, which includes the fixing fitting 5, is set separately from the end plate 1, the specific form of the cover fitting seat 31 can be flexibly changed by those skilled in the art as needed. Similarly, whether or not to set the cover fitting part 32 is also a choice that those skilled in the art can flexibly make.

[0062] In summary, in the battery pack provided by the present invention, assuming that the fixing component 5 has cooperated with the receiving groove 311 and the limiting component 6, the assembly steps of the protective device, copper busbar III and current guide I may include:

[0063] S1: Make one end of copper bus III cover the flow guide I located on the cover mating seat 31;

[0064] S2: Drive in the fastener 4 so that the fastener 4 is inserted into the screw holes 50 on the copper busbar III, the guide busbar I and the fastener 5 in sequence;

[0065] S3: Tighten the fastener 4.

[0066] Example 2

[0067] like Figure 9 and Figure 10 As shown, the difference between this embodiment and embodiment one is that the shape of the receiving groove 311, the limiting member 6 and the fixing fitting member 5 have been changed. At the same time, the base 3 also includes a plug 33. During the assembly process of the plug 33, the plug 33 needs to be placed into the receiving groove 311 after the fixing fitting member 5, which can prevent the fixing fitting member 5 from falling out of the cover fitting seat 31 after it is placed into the receiving groove 311.

[0068] Specifically, the fixing fitting 5 in this embodiment includes a cuboid body 52, the aforementioned screw holes 50 are disposed on the body 52, and the lower left and right surfaces of the body 52 are respectively provided with outwardly extending flanges 53, so that the entire fixing fitting 5 has a convex cross-section; in addition, a U-shaped mating groove 521 is provided between the two screw holes 50 on the fixing fitting 5, which penetrates the fixing fitting 5 in the left and right direction. The mating groove 521 is formed by recessing downward from the upper surface of the fixing fitting 5, and divides the upper part of the fixing fitting 5 into two spaced block-shaped screw units 522, so that the aforementioned screw holes 50 are respectively disposed on the screw units 522.

[0069] As described above, in this embodiment, the receiving groove 311 is formed by recessing from the middle of the front surface of the cover fitting seat 31 and has a convex cross-section to form a convex front opening at the front end of the cover fitting seat 31; the receiving groove 311 can accommodate the fixing fitting member 5, and its height is greater than that of the fixing fitting member 5, and the fixing fitting member 5 can be inserted from front to back; when the fixing fitting member 5 is inserted into the receiving groove 311, the fixing fitting member 5 has an upward movement margin, but no left and right movement margin; in other words, the fixing fitting member 5 and the receiving groove 311 are engaged in the left and right direction.

[0070] On the upper surface of the cover mating part 32, two mating holes 3113 are recessed downward from the surface to form a connecting receiving groove 311. The mating holes 3113 allow the screw unit 522 to pass through them, so that the screw hole 50 can be exposed outside the cover mating seat 31 and the fixing member 5 can move upward. At the same time, the mating holes 3113 are spaced apart from each other, and the space forms a horizontal beam-shaped limiting member 6 extending from left to right on the cover mating seat 31. The limiting member 6 can engage with the mating groove 521 in the front-back direction, and when the fixing member 5 engages with itself, it extends into the mating hole 3113. The limiting member 6 and the mating hole 3113 work together to limit the fixing member 5 in the horizontal direction. Furthermore, the height of the mating groove 521 in the vertical direction is greater than the height of the limiting member 6 in the vertical direction. Based on this, by inserting the fixing member 5 into the receiving groove 311 from front to back and then lifting it upward to a certain height, the mating groove 521 can be engaged with the limiting member 6, and the fixing member 5 can be inserted into the mating hole 3113. At this time, there is a distance between the lower surface of the body 52 and the bottom wall of the receiving groove 311, so that the aforementioned plug 33 can be inserted into the cover mating seat 31 after the fixing member 5.

[0071] As described above, the plug 33 in this embodiment is generally L-shaped, comprising a horizontally extending plate-like portion 331 and a closing portion 332 extending upward from the front end of the plate-like portion 331. More specifically, the plate-like portion 331 of the plug 33 can extend into the receiving groove 311 and is located below the fixing member 5. The outer contour of the closing portion 332 of the plug 33 is a similar shape to the outer contour of the receiving groove 311. The closing portion 332 can block the front opening of the cover fitting seat 31, preventing the fixing member 5 from coming out during processes such as transportation after being placed into the receiving groove 311. Furthermore, the upper end of the closing portion 332 is also provided with... Figure 11 The shown snap-fit ​​part 3321 can be used as follows: Figure 12 The shown portion engages with the front edge of the mating hole 3113 located at the front end of the cover mating seat 31 to fix the closure portion 332 onto the cover mating seat 31.

[0072] Please refer to further information. Figure 13 and Figure 14 When the fixing member 5 and the plug 33 are sequentially placed into the receiving groove 311, the fixing member 5 is horizontally engaged with the cover mating seat 31 due to the restriction of the receiving groove 311 and the limiting member 6. Simultaneously, by controlling the engagement depth between the fixing member 5 and the limiting member 6, a second gap 8 exists between the plate-shaped portion 331 of the fixing member 5 and the plug 33; a third gap 9 exists between the bottom wall of the mating groove 521 and the limiting member 6; and a gap exists between the upper surface of the flange 53 and the receiving groove 311. Figure 15 The fourth gap 10 is shown.

[0073] In this embodiment, the existence of the second gap 8 means that when the fixed fitting 5 is lifted, the height to which the fixed fitting 5 is lifted is greater than the thickness of the plate-shaped part 331, which facilitates the easy placement of the plate-shaped part 331 into the receiving groove 311. The existence of the third gap 9 and the fourth gap 10 means that the fixed fitting 5 has an upward floating margin within the cover fitting seat 31. The upward floating margin of the fixed fitting 5 is determined by the smaller of the vertical lengths of the third gap 9 and the fourth gap 10. Based on this, the fixed fitting 5 is first placed into the cover fitting seat 31 and the fixed fitting 5 is lifted appropriately so that the fixed fitting 5 engages with the fitting hole 3113 and the limiting member 6. Then, the plug 33 is inserted to ensure that the fixed fitting 5 will not come out of the cover fitting seat 31 during transportation. After that, the fixing member 4 is inserted sequentially through the copper busbar III, the guide busbar I, and the fixed fitting 5. The fixing member 4 is then turned to a certain extent, and the fixed fitting 5 can float upward.

[0074] In summary, by limiting the horizontal position of the fixing member 5 within the base 3 while allowing it to move upwards, this invention provides a base 3 for a battery module protection device. The base 3 includes a cover fitting 31 and a fixing member 5 disposed within the cover fitting 31. Given a gap between the guide bus I and the cover fitting 31 due to tolerances, when the cover fitting 31 is assembled with the fixing member 4 and the guide bus I, the fixing member 5 can float upwards relative to the cover fitting 31 and abut against the guide bus I, preventing deformation of the guide bus I due to tightening the fixing member 4, thus avoiding unacceptable assembly stress. This base 3 ensures reliable assembly connection between the copper bus III and the guide bus I. It should be noted that this base 3 is particularly suitable for installation in power battery packs and energy storage battery boxes.

[0075] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A base for a battery module protective device, used to cooperate with a protective cover (2) to form a protective device capable of insulating and protecting the output terminal of the battery module; the output terminal of the battery module and the base (3) can be inserted by a fixing member (4); characterized in that, The base (3) includes a cover fitting seat (31), and a fixing fitting member (5) is provided in the cover fitting seat (31). The fixing fitting member (5) is limited by the cover fitting seat (31) in the horizontal direction and can move upward relative to the cover fitting seat (31). The fixing fitting member (5) is provided with a threaded hole (50) for threaded connection with the fixing member (4). The fixing member (4) abuts against the output terminal of the battery module, and when the fixing member (4) passes through the fixing fitting member (5) and rotates along its own axis at a fixed height, the fixing fitting member (5) can apply a force to the cover fitting seat (31) by means of the threaded connection between it and the fixing member (4), and move upward relative to the cover fitting seat (31) under the action of the reaction force applied by the cover fitting seat (31).

2. The base of the battery module protection device as described in claim 1, characterized in that, The screw hole (50) is arranged in the vertical direction, and the cover fitting seat (31) is provided with a receiving groove (311) that can accommodate the cover fitting seat (31); the base (3) also includes a limiting member (6), which is arranged on the cover fitting seat (31) and can be engaged with the fixed fitting member (5) to limit the upward movement of the fixed fitting member (5); the battery module output terminal includes a guide bus, and the upward movement of the fixed fitting member (5) is configured to abut against the guide bus.

3. The base of the battery module protection device as described in claim 2, characterized in that, The receiving groove (311) includes a groove body (3111), and several ribs (3112) are formed protruding from the inner wall of the groove body (3111) toward the center of the groove body (3111). The ribs (3112) are spaced apart from each other, and the several ribs (3112) form a structure that can limit the fixing member (5) in the horizontal direction.

4. The base of the battery module protection device as described in claim 2, characterized in that, The limiting member (6) includes a pin handle (61) and a pin rod (60) connected to each other. The pin rod (60) extends horizontally. The cover fitting seat (31) is provided with a fitting inlet (313) communicating with the receiving groove (311) and an insertion hole (312) located on one side of the fixed fitting member (5). The fixed fitting member (5) is provided with a horizontal through hole (51). The pin handle (61) can engage with the fitting inlet (313). The pin rod (60) can extend into the long hole (51) through the fitting inlet (313) and be inserted into the insertion hole (312), so that the fixed fitting member (5) can move up and down relative to the cover fitting seat (31) and cannot be dislodged from the cover fitting seat (31).

5. The base of the battery module protection device as described in claim 2, characterized in that, The receiving groove (311) can form an opening on the cover fitting seat (31), which is used for the fixing fitting (5) to be inserted into the cover fitting seat (31) in the horizontal direction; the fixing fitting (5) includes at least two screw units (522), and a fitting groove (521) is provided between the screw units (522) and recessed relative to the screw units (522). The screw units (522) are provided with the screw holes (50), and the cover fitting seat (31) is provided with fitting holes (3113) through which the screw units (522) can pass. The fitting holes (3113) are arranged in the vertical direction and communicate with the receiving groove (311), and the limiting member (6) is provided between the fitting holes (3113). The limiting member (6) can cooperate with the fitting groove (521); the fitting holes (3113) and the limiting member (6) cooperate to lock the fixing fitting (5) in the horizontal direction.

6. The base of the battery module protection device as described in claim 5, characterized in that, It also includes a plug (33), which includes a plate-shaped portion (331) and a closing portion (332) connected to each other. The plate-shaped portion (331) is located below the fixing member (5), and the closing portion (332) can close the opening on the cover fitting seat (31) into which the fixing member (5) is inserted.

7. The base of the battery module protection device as described in claim 5, characterized in that, The receiving groove (311) has a convex cross section, and the fixing fitting (5) has a convex cross section. The fixing fitting (5) includes a body (52) and a flange (53) extending outward from the lower front and rear surfaces of the body (52). There is a third gap (9) between the bottom wall of the fitting groove (521) and the bottom surface of the limiting member (6), and there is a fourth gap (10) between the top surface of the flange (53) and the receiving groove (311). The smaller value of the third gap (9) and the fourth gap (10) in the vertical direction is the stroke of the fixing fitting (5) that can move upward.

8. A protective device, characterized in that, The base (3) includes the battery module protection device as described in any one of claims 1-7.

9. An end plate, characterized in that, It is integrated with the base (3) of the battery module protection device as described in any one of claims 1-7.

10. A battery pack, characterized in that, The base (3) includes the battery module protection device as described in any one of claims 1-7.

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