CN214898771U

CN214898771U - Fastening bolt, battery module and battery pack

Info

Publication number: CN214898771U
Application number: CN202120996934.0U
Authority: CN
Inventors: 任旭生; 綦槐松
Original assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Current assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Priority date: 2021-05-11
Filing date: 2021-05-11
Publication date: 2021-11-26
Anticipated expiration: 2031-05-11

Abstract

The utility model discloses a fastening bolt, battery module and battery package relates to battery package technical field. The fastening bolt comprises a stud and a nut, wherein the stud comprises a first external thread and a second external thread which are arranged in sequence and have opposite rotation directions, the first external thread is matched with a first threaded hole in a to-be-connected part, and the second external thread is matched with the nut for screwing; the nut comprises an insulating shell and a connector, the connector is sleeved in the insulating shell, a second threaded hole is formed in the connector, and the second external thread is screwed in cooperation with the second threaded hole. Due to the fact that the rotating directions of the first external thread and the second external thread are opposite, under the working condition of vibration, if the first external thread is in threaded connection with the to-be-connected piece, the second external thread can be in threaded connection with the nut more tightly, and the fastening bolt is not prone to loosening; moreover, the insulating shell of the nut has an insulating function, and when the nut is electrically connected through the fastening bolt, the risk of electric shock is reduced.

Description

Fastening bolt, battery module and battery pack

Technical Field

The utility model relates to a battery package technical field especially relates to a fastening bolt, battery module and battery package.

Background

In the field of new energy automobiles, a power battery is a core component of the new energy automobiles, the safety of the power battery is concerned with the life and property safety of vehicles and passengers, electric shock and ignition spontaneous combustion accidents of the electric automobiles frequently happen in recent years, and the insulation and the safety of the power battery are more and more emphasized in the new energy industry.

The power battery system assembling process usually uses the bolt to fasten, wherein relate to among the bolt-up and connect, the module is fixed and case lid is fixed etc. and the reliability of bolt-up and insulating effect has direct influence to the safety of battery. The power battery joint in the prior art is fastened by using a common bolt, wherein parts at the joint and the bolt mainly achieve the fastening effect by means of the friction between a bolt head and a copper bar, the mutual friction between threads and pretightening force. The common bolt structural design lacks an effective anti-loosening mechanism, the battery bolt is easy to loosen in the vibration process of vehicle running and under complex working conditions, so that the internal resistance of an electric connection part is increased, spontaneous combustion is caused by heating, moreover, the bolt directly falls off to cause that the battery can not supply power or a module falls off, and traffic safety accidents are caused by sudden stop in the vehicle running process; and power battery work is along with the input and the output of electric energy, and the insulating protection of bolt is not considered in current ordinary bolt fastening, appears the battery electric leakage easily or insulating bad personnel risk of electrocuting.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a fastening bolt, a battery module and a battery pack, wherein the fastening bolt not only prevents looseness, but also has an insulation function; the battery module is electrically connected and fixed by the fastening bolt, so that the connection is firm and electric shock is prevented; the battery pack using the battery module has high safety performance.

To achieve the purpose, the utility model adopts the following technical proposal:

a fastening bolt comprises a stud and a nut, wherein the stud comprises a first external thread and a second external thread which are arranged in sequence and have opposite rotation directions, the first external thread is matched with a first threaded hole in a to-be-connected part, and the second external thread is matched with the nut for screwing; the nut comprises an insulating shell and a connector, the connector is sleeved in the insulating shell, a second threaded hole is formed in the connector, and the second external thread is matched with the second threaded hole for screwing.

Optionally, a first screwing portion is further arranged between the first external thread and the second external thread, and is used for being matched with a locking tool to lock or unlock the stud and the to-be-connected component.

Optionally, the length of the nut matched with the stud is equal to or greater than the sum of the length of the second external thread and the length of the first screwing part, so that the nut can coat the first screwing part.

Optionally, a second screwing portion is arranged on the nut and used for being matched with an locking tool to lock or unlock the stud and the nut.

Optionally, the second screwing part comprises a screwing block and/or a first connection hole, the screwing block is arranged on the insulating shell, and the first connection hole is arranged at one end, far away from the stud, of the connector and is communicated with the outside.

Optionally, the circumference of the screwing block is arranged into an outer hexagonal structure; the first connecting hole is of an inner hexagonal structure, a cross structure, a straight structure or a plum blossom structure.

The utility model provides a battery module, battery module includes a plurality of electric cores, adjacent two electric core is through connecting copper bar electric connection, wherein, connect the copper bar with positive post or negative pole post of electric core are through fastening bolt connect as above arbitrary.

Optionally, the two ends of the connecting copper bar, the positive pole and the negative pole are provided with the first threaded holes, the first external threads are matched and locked with the first threaded holes, and the second threaded holes are matched and locked with the second external threads.

Optionally, the battery module further comprises a module frame, and the battery core is fixedly connected with the module frame; the two ends of the battery cell are provided with connecting portions, each connecting portion comprises a second external thread, and the second threaded holes are matched and locked with the second external threads.

A battery pack comprises the battery module.

The utility model has the advantages that:

the utility model provides a fastening bolt sets up on the double-screw bolt and revolves to opposite first external screw thread and second external screw thread, and the nut includes insulating casing and connector, through first external screw thread and treat the connecting piece spiro union, through second external screw thread and connector spiro union. Due to the fact that the rotating directions of the first external thread and the second external thread are opposite, under the working condition of vibration, if the first external thread is in threaded connection with the to-be-connected piece, the second external thread can be in threaded connection with the nut more tightly, and the fastening bolt is not prone to loosening; moreover, the insulating shell of the nut has an insulating function, and when the nut is electrically connected through the fastening bolt, the risk of electric shock is reduced.

The utility model provides a battery module, it is fixed with electric core to use above-mentioned fastening bolt to realize the electricity of battery module. Under the vibration working condition, the fastening bolt is not easy to loosen, the internal resistance of the electric connection part of the battery module is not easy to increase, and the spontaneous combustion phenomenon is avoided; the battery core is firmly fixed, so that the phenomenon that power cannot be supplied is avoided; moreover, the nut is provided with an insulating shell, so that the risk of electric shock during electric leakage of the battery module is reduced.

The utility model provides a battery package uses foretell battery module, has improved the security performance of battery package.

Drawings

Fig. 1 is an exploded schematic view of a fastening bolt according to an embodiment of the present invention;

fig. 2 is an exploded view of a nut according to an embodiment of the present invention;

fig. 3 is a schematic view of an internal structure of a battery module according to a second embodiment of the present invention;

fig. 4 is a schematic view of a connection structure between two adjacent battery cells in a battery module according to an embodiment of the present invention;

fig. 5 is a top view of a connection structure between two adjacent battery cells in a battery module according to an embodiment of the present invention;

FIG. 6 is a sectional view taken along line A-A of FIG. 5;

fig. 7 is a partially enlarged view at B in fig. 6.

In the figure:

100. a battery module;

101. an electric core; 102. connecting the copper bars; 103. a connecting portion; 104. a module frame; 105. a plain bolt;

1031. a second connection hole; 1032. sinking a groove;

1. a stud; 2. a nut;

11. a first external thread; 12. a second external thread; 13. a first tightening part; 21. an insulating housing; 22. a linker;

211. screwing the block; 212. avoiding the mouth; 221. a second threaded hole; 222. a first connection hole.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Example one

As shown in fig. 1 and fig. 2, the present embodiment provides a fastening bolt, which includes a stud 1 and a nut 2, where the stud 1 includes a first external thread 11 and a second external thread 12 that are arranged in sequence and have opposite turning directions, the first external thread 11 is matched with a first threaded hole on a to-be-connected component, and the second external thread 12 is matched with the nut 2 for screwing; the nut 2 includes an insulating housing 21 and a connector 22, the connector 22 is sleeved in the insulating housing 21, a second threaded hole 221 is formed in the connector 22, and the second external thread 12 is screwed in cooperation with the second threaded hole 221.

According to the fastening bolt provided by the embodiment, the stud 1 is provided with the first external thread 11 and the second external thread 12 which are opposite in screwing direction, the nut 2 comprises the insulating shell 21 and the connecting body 22, the first external thread 11 is screwed with a to-be-connected piece, and the second external thread 12 is screwed with the connecting body 22. Because the rotating directions of the first external thread 11 and the second external thread 12 are opposite, under the working condition of vibration, if the first external thread 11 is not screwed with the to-be-connected piece, the second external thread 12 is screwed with the screw cap 2 more tightly, so that the fastening bolt is not easy to loosen; furthermore, the insulating housing 21 of the nut 2 has an insulating function, and the risk of electric shock is reduced when electrically connected by the fastening bolt.

In this embodiment, the first external thread 11 is a right-hand external thread, and the first threaded hole on the to-be-connected component is a right-hand internal thread. The second external thread 12 is a left-hand external thread, and the second threaded hole 221 in the connector 22 is a left-hand internal thread. Under the vibration operating mode, when the double-screw bolt 1 revolves because of the vibration left-hand, can drive nut 2 left-hand, and nut 2 left-hand can make nut 2 and double-screw bolt 1 be connected more and more tightly to prevented double-screw bolt 1 from rotating and treated the connecting piece pine and take off, avoided when fastening bolt is used for the electricity to be connected, because fastening bolt pine takes off the electric connection department internal resistance that causes and increase, generate heat and cause the phenomenon of spontaneous combustion.

Alternatively, the connecting body 22 is made of metal and the insulating housing 21 is made of plastic. In this embodiment, the stud 1 and the connecting body 22 are both made of a metal material with high strength, the insulating housing 21 is made of a plastic material, and the insulating housing 21 and the connecting body 22 are made into an integral piece through an injection molding process, so that the strength and the precision of the nut 2 can be ensured, and the insulating function is achieved. When the fastening bolt is used for electric connection, the electric conduction function can be achieved, and electric shock of personnel caused by electric leakage or poor insulation can be avoided.

Of course, in other embodiments, the insulating housing 21 may be made of rubber, and the connecting body 22 and the insulating housing 21 made of rubber are connected by vulcanization.

In order to facilitate the assembly and disassembly of the stud 1 and the to-be-connected component, optionally, a first screwing portion 13 is further disposed between the first external thread 11 and the second external thread 12, and is used for being matched with a locking tool to lock or unlock the stud 1 and the to-be-connected component.

Preferably, the first screwing part 13 is an external hexagonal bolt head, so that an operator can conveniently lock or unlock the stud 1 and the to-be-connected component through a sleeve or an external hexagonal wrench. It should be noted that, during locking, the first external thread 11 is firstly locked with the to-be-connected component in a matching manner, and then the second external thread 12 is locked with the nut 2 in a matching manner. When the device is disassembled, the screw cap 2 and the stud 1 are unlocked, and then the stud 1 and the to-be-connected piece are unlocked.

Of course, in other embodiments, the first screwing portion 13 may have other structures, for example, a connecting member is disposed between the first external thread 11 and the second external thread 12, one end of the connecting member is sleeved on the stud 1, and the other end of the connecting member is disposed as a ring body, and the stud 1 and the member to be connected may also be locked or unlocked by inserting an iron rod into the ring body to rotate.

Preferably, the length of the nut 2 engaged with the stud 1 is equal to or greater than the sum of the length of the second external thread 12 and the length of the first fastening portion 13, so that the nut 2 can cover the first fastening portion 13. In this embodiment, the diameter of the second external thread 12 is greater than the diameter of the external hexagonal bolt head, the length of the nut 2 matched with the stud 1 is equal to the length of the second external thread 12 and the length of the external hexagonal bolt head, the thread of the second threaded hole 221 of the connector 22 is turned to be flush with the end face, when the nut 2 is connected with the stud 1, the second external thread 12 is matched with the second threaded hole 221, and the external hexagonal bolt head is wrapped in the second threaded hole 221, so that an electric shock accident caused by electric leakage at the external hexagonal bolt head is prevented. This arrangement facilitates the processing and manufacturing of the connecting body 22. Of course, in other embodiments, the length of the nut 2 engaged with the stud 1 may be greater than the sum of the length of the second external thread 12 and the length of the first fastening portion 13, and it is only necessary that the second external thread 12 can be connected with the nut 2 and the first fastening portion 13 can be covered.

In order to facilitate the detachment and installation of the nut 2 and the stud 1, optionally, a second screwing portion is arranged on the nut 2 and used for being matched with an attaching tool to lock or unlock the stud 1 and the nut 2.

Optionally, the second screwing portion includes a screwing block 211 and a first connection hole 222, the screwing block 211 is disposed on the insulating housing 21, and the first connection hole 222 is disposed at an end of the connection body 22 away from the stud 1 and is communicated with the outside. In this embodiment, the connecting body 22 and the insulating housing 21 are both configured as a stepped cylinder, a second threaded hole 221 is disposed in the cylinder with a larger diameter of the connecting body 22, and a first connecting hole 222 is disposed at one end of the cylinder with a smaller diameter; the cylinder with the larger diameter of the insulating housing 21 is sleeved on the cylinder with the larger diameter of the connecting body 22, and the cylinder with the smaller diameter is sleeved on the cylinder with the smaller diameter of the connecting body 22. One end of the smaller cylinder of the insulating housing 21 is further provided with a relief opening 212 of the first connection hole 222 so that the first connection hole 222 can be connected with a locking tool. Of course, in other embodiments, only the tightening block 211 may be disposed on the insulating housing 21, or only the first connection hole 222 may be disposed on the connection body 22.

Preferably, the tightening block 211 is circumferentially arranged in an outer hexagonal structure, and the nut 2 can be locked or unlocked by a sleeve or an outer hexagonal wrench; the first connection hole 222 is configured to have an inner hexagonal structure, a cross-shaped structure, a straight-line structure, or a double offset ring structure, and the nut 2 is locked or unlocked by an inner hexagonal wrench, a cross-shaped wrench, a straight-line wrench, or a double offset ring wrench.

Example two

As shown in fig. 3 and fig. 4, the present embodiment provides a battery module, where the battery module 100 includes a plurality of battery cells 101, positive and negative poles of two adjacent battery cells 101 are electrically connected through a connection copper bar 102, and the connection copper bar 102 is connected with a positive pole or a negative pole of the battery cell 101 through the fastening bolt provided in the first embodiment.

In the battery module provided in this embodiment, the fastening bolt provided in the first embodiment is used to electrically connect the battery module 100 and fix the battery cell 101. Under the vibration working condition, the fastening bolt is not easy to loosen, the internal resistance of the electric connection part of the battery module 100 is not easy to increase, and the spontaneous combustion phenomenon is avoided; the battery core 101 is firmly fixed, so that the phenomenon that power cannot be supplied is avoided; in addition, the nut 2 has the insulating case 21, so that the risk of electric shock when the battery module 100 leaks electricity is reduced.

Optionally, first threaded holes are formed in both ends of the connecting copper bar 102, the positive post and the negative post, the first external thread 11 is matched and locked with the first threaded holes, and the second threaded hole 221 in the nut 2 is matched and locked with the second external thread 12. The connection copper bar 102 and the fastening bolt are used for realizing the communication between the positive electrode and the negative electrode of the battery module 100, when the battery module 100 works under the vibration working condition, the electric connection part is not easy to loosen, and the increase of internal resistance at the electric connection part and spontaneous combustion caused by heating are avoided; and when electric core 101 electric leakage, insulating casing 21 of nut 2 can protect personnel's safety, reduces the risk of electrocution.

Optionally, as shown in fig. 5 to 7, the battery module 100 further includes a module frame 104, and the battery core 101 is fixedly connected to the module frame 104; both ends of electric core 101 all are provided with connecting portion 103, and connecting portion 103 includes second external screw thread 12, and second screw hole 221 on the nut 2 locks with the cooperation of second external screw thread 12. In this embodiment, in order to fix the battery cell 101 and the module frame 104, the connection portions 103 are respectively disposed at two ends of the battery cell 101, the two ends of the battery cell 101 are fixed to the module frame 104 through the connection portions 103, and on the basis of the fixation of the conventional ordinary bolt 105, the second external thread 12 is added to the connection portions 103, and is connected to the second external thread 12 through the nut 2, so as to prevent the ordinary bolt 105 from loosening. The connecting portion 103 further includes a second connecting hole 1031, a third threaded hole is provided on the module frame 104, the thread turning direction of the third threaded hole is the same as that of the first threaded hole, the second external thread 12 is coaxially disposed with the second connecting hole 1031, the common bolt 105 passes through the second connecting hole 1031 and is screwed and fixed with the third threaded hole in the prior art, in order to prevent the electric core 101 fixed by the common bolt 105 in the prior art from being loosened, a sinking groove 1032 is coaxially disposed at the upper end of the connecting portion 103 and the second connecting hole 1031, the second external thread 12 is disposed on the inner wall of the sinking groove 1032 (i.e., the periphery of the second connecting hole 1031), and the nut 2 is connected with the second external thread 12, so that the electric core 101 fixed by the common bolt 105 in the prior art can be prevented from being loosened. Therefore, the anti-loosening and falling of the common bolt 105 can be realized only by slightly changing the original design, and the transformation cost is reduced.

The embodiment also provides a battery pack, which comprises the battery module 100, and the safety performance of the battery pack is improved. The vehicle using the battery pack is higher in safety.

The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims

1. A fastening bolt is characterized by comprising a stud (1) and a nut (2), wherein the stud (1) comprises a first external thread (11) and a second external thread (12) which are arranged in sequence and have opposite rotation directions, the first external thread (11) is matched with a first threaded hole in a to-be-connected part, and the second external thread (12) is matched with the nut (2) for screwing; the screw cap (2) comprises an insulating shell (21) and a connecting body (22), the connecting body (22) is sleeved in the insulating shell (21), a second threaded hole (221) is formed in the connecting body (22), and the second external thread (12) is matched with the second threaded hole (221) to be screwed tightly.

2. The fastening bolt according to claim 1, characterized in that a first screwing portion (13) is further provided between the first external thread (11) and the second external thread (12) for cooperating with a locking tool to lock or unlock the stud (1) and the member to be connected.

3. A fastening screw according to claim 2, characterised in that the length of the nut (2) fitted to the stud (1) is equal to or greater than the sum of the length of the second external thread (12) and the length of the first tightening part (13) so that the nut (2) can wrap the first tightening part (13).

4. A fastening screw according to claim 1, characterised in that the nut (2) is provided with a second tightening part for locking or unlocking the stud (1) and the nut (2) in cooperation with a locking tool.

5. The fastening bolt according to claim 4, wherein the second screwing portion comprises a screwing block (211) and/or a first connection hole (222), the screwing block (211) is disposed on the insulating housing (21), and the first connection hole (222) is disposed at an end of the connection body (22) away from the stud (1) and communicates with the outside.

6. The fastening screw according to claim 5, wherein the tightening block (211) is circumferentially arranged in an outer hexagonal structure; the first connecting hole (222) is of an inner hexagonal structure, a cross structure, a straight structure or a plum blossom structure.

7. A battery module, the battery module (100) comprising a plurality of battery cells (101), two adjacent battery cells (101) being electrically connected through a connecting copper bar (102), wherein the connecting copper bar (102) is connected with a positive pole or a negative pole of the battery cell (101) through a fastening bolt according to any one of claims 1 to 6.

8. The battery module according to claim 7, wherein the first threaded holes are formed in both ends of the connecting copper bar (102) and the positive and negative posts, the first external threads (11) are locked with the first threaded holes, and the second external threads (221) are locked with the second external threads (12).

9. The battery module according to claim 7, characterized in that the battery module (100) further comprises a module frame (104), and the battery core (101) is fixedly connected with the module frame (104); both ends of electric core (101) all are provided with connecting portion (103), connecting portion (103) include second external screw thread (12), second screw hole (221) with second external screw thread (12) cooperation locking.

10. A battery pack, characterized by comprising the battery module (100) according to any one of claims 7 to 9.