WO2021136237A1

WO2021136237A1 - Locking mechanism for battery pack, quick-swap support assembly, and electric automobile

Info

Publication number: WO2021136237A1
Application number: PCT/CN2020/140684
Authority: WO
Inventors: 张建平; 黄春华
Original assignee: 奥动新能源汽车科技有限公司
Priority date: 2019-12-31
Filing date: 2020-12-29
Publication date: 2021-07-08
Also published as: CN113119707A

Abstract

A locking mechanism for a battery pack, comprising a lock base (10) and a lock tongue (20). The lock base (10) has an opening (101) and a cavity (102). The opening (101) is used for the lock shaft of a battery pack to enter the cavity (102). The lock tongue (20) can rotate with respect to the lock base (10) to switch between an unlocking state and a locking state. The lock tongue (20) comprises a lock tongue body (201), a first lock tongue expansion portion (202), and a second lock tongue expansion portion (203) that are connected end to end. When in the locking state, the lock tongue body (201) can prevent the lock shaft from leaving the cavity (102), the lock tongue body (201) is located in the lock base (10), and the first and second lock tongue expansion portions (202, 203) are located outside the lock base (10). Along the thickness direction of the lock base (10), at least one end of the second lock tongue expansion portion (203) extends out of the first lock tongue expansion portion (202). The second lock tongue expansion portion (203) increases the contact area between the lock tongue (20) and a positioning fork (50), thereby reducing the possibility of the positioning fork (50) being dislocated with respect to the lock tongue (20), so that is not easy for the positioning fork (50) to enter into the side seams on two sides of the lock tongue (20), thus improving the success rate of battery swapping one time. Also provided are a quick-swap support assembly comprising the locking mechanism and an automobile.

Description

Locking mechanism for battery pack, quick-change bracket assembly and electric vehicle

This application claims the priority of Chinese patent application 2019114157970 whose filing date is December 31, 2019. This application quotes the full text of the aforementioned Chinese patent application.

Technical field

The invention relates to the field of electric vehicles, in particular to a locking mechanism for battery packs, quick-change bracket components and electric vehicles.

Background technique

The locking mechanism is installed on the quick-change bracket, which is an important structure for installing the battery pack on the quick-change bracket. The lock mechanism includes a lock base and a lock tongue. When the battery is changed, the positioning fork on the battery replacement device cooperates with the lock tongue to unlock the lock mechanism. For the locking mechanism in the prior art, when the positioning fork is matched with the bolt, the arc area is matched with the arc area, the actual contact surface is small, and the positioning fork is likely to be misaligned relative to the bolt during the process of power exchange. , Which makes the positioning fork easy to fork into the side seams on both sides of the lock tongue (one of the side seams is formed by the lock tongue and the battery pack, and the other side seam is formed by the lock tongue and the quick-change bracket), which affects the success rate of one battery replacement .

In summary, the locking mechanism in the prior art has the defect that when the lock tongue is matched with the positioning fork, it is easy to be misaligned with the positioning fork, which affects the success rate of one-time power exchange.

Summary of the invention

The technical problem to be solved by the present invention is to overcome the defect that the locking mechanism in the prior art has the lock tongue and the positioning fork when the lock tongue is matched with the positioning fork and is easy to be misaligned with the positioning fork, which affects the success rate of one-time power exchange, and provides a battery pack for battery pack Locking mechanism, quick-change bracket assembly and electric vehicle.

The present invention solves the above technical problems through the following technical solutions:

A locking mechanism for a battery pack includes a lock base and a lock tongue. The lock base has an opening and a cavity extending from the opening. The opening is used for a lock installed on the battery pack. The shaft enters the cavity; the lock tongue can rotate relative to the lock base to switch between the unlocked state and the locked state, and is characterized in that the lock tongue includes a lock tongue body and a second A lock tongue expansion part and a second lock tongue expansion part, when the lock tongue is in the locked state, the lock tongue body can prevent the lock shaft from leaving the cavity from the opening, and the lock The tongue body is located in the lock base, and the first lock tongue expansion portion and the second lock tongue expansion portion are located outside the lock base;

Wherein, along the thickness direction of the lock base, at least one end of the second bolt expansion part extends out of the first bolt expansion part.

In this solution, the second bolt expansion part extends out of the first bolt expansion part. When the battery needs to be replaced, the second bolt expansion part cooperates with the positioning fork. Compared with the prior art, the second bolt expands The part of the extension part of the first bolt extension part increases the contact area between the bolt and the positioning fork, thereby reducing the possibility of the positioning fork being misaligned relative to the bolt, making it difficult for the positioning fork to fork between the bolt and the battery pack. / Or in the side seam formed by the quick-change bracket, therefore, the success rate of a battery change can be improved.

Preferably, along the thickness direction of the lock base, the second bolt extension extends at most to be aligned with the outer edge of the lock base.

In this solution, one side of the lock base (hereinafter referred to as the "first side") is used to install on the quick-change bracket, and the other side of the lock base (hereinafter referred to as the "second side") is used to face the battery package. Wherein, if the second tongue expansion portion corresponding to the first side surface extends out of the first side surface, the second tongue expansion portion will occupy a larger space for the locking mechanism, and the second tongue expansion portion may also easily affect the lock Installation of base and quick-change bracket. If the second tongue expansion portion corresponding to the second side surface extends out of the second side surface, the second tongue expansion portion will occupy a larger space for the locking mechanism, and the second tongue expansion portion may easily catch the battery pack , Which will affect the success rate of power exchange.

Preferably, along the thickness direction of the lock base, both ends of the second bolt expansion part extend out of the first bolt expansion part.

In this solution, the above-mentioned structure is adopted. When the locking mechanism is matched with the positioning fork, compared with the prior art, both ends of the second bolt extension part have a larger contact area with the positioning fork, which can further The positioning fork is not easily misaligned with the expansion part of the second tongue, and the positioning fork is not easy to fork into the side seams on both sides of the tongue, which is beneficial to further improve the success rate of a battery replacement.

Preferably, the parts of the two ends of the second bolt expansion part that extend out of the first bolt expansion part are a first extension part and a second extension part, and the first extension part and the second extension part are respectively The cross-sectional shapes of the extensions are the same.

In this solution, the above-mentioned structure is adopted, and the cross-sectional shape of the first extension part and the second extension part when mated with the positioning fork is the same, which is beneficial to reduce the requirements on the positioning fork, and is beneficial to realize the positioning fork and the second latch extension part More reliable cooperation, correspondingly, is also conducive to improving the success rate of power exchange.

Preferably, the first extension part and the second extension part are symmetrically arranged with respect to the central axis of the first bolt extension part.

In this solution, the adoption of the above-mentioned structural arrangement is beneficial to further reduce the requirements on the positioning fork, thereby helping to ensure the reliable cooperation between the positioning fork and the extension of the second tongue, and further improving the success rate of battery replacement.

Preferably, one end of the second bolt expansion part away from the first bolt expansion part is an arc-shaped part, and the arc-shaped parts are evenly distributed along the thickness direction of the lock base.

In this solution, the above-mentioned structure is adopted, and the part of the second bolt expansion part that extends from the first bolt expansion part and the part corresponding to the first bolt expansion part are the same arc-shaped parts, so that the In the thickness direction of the lock base, the mating surfaces of the second tongue extension part and the positioning fork are exactly the same, which is beneficial to reduce the requirements for the positioning fork, and is beneficial to improve the reliability of the positioning fork and the second tongue extension part. In turn, it is beneficial to improve the success rate of a power exchange.

Preferably, one end of the second bolt expansion part close to the first bolt expansion part has a planar structure.

Preferably, the first bolt expansion part and the second bolt expansion part are integrally formed.

In this solution, with the above-mentioned structure and arrangement, the forming method of the bolt is relatively simple, and the first bolt expansion part and the second bolt expansion part can achieve reliable joint without additional indirect structure or connection method, which improves The reliability of the lock tongue is improved, and the space occupied by the locking mechanism and the overall weight are reduced.

Preferably, when the bolt is in the locked state, the lowest point of the end of the second bolt extension that is away from the first bolt extension is located above the lowest point of the bolt body , Or, the lowest point of the end of the second bolt expansion part away from the first bolt expansion part and the lowest point of the bolt body are on the same horizontal line.

In this solution, if the position of the lowest point of the second tongue expansion part is too low, a positioning fork is used to cooperate with the second tongue expansion part, so that the positioning fork acts on the second tongue expansion part to realize the battery pack When unlocking, the movement stroke of the lock tongue is too large, which will take a long time to unlock, which will easily affect the efficiency of power exchange.

Preferably, the first lock tongue expansion portion is a bending structure and includes a first bending portion and a second bending portion, and the first bending portion is connected to the lock tongue body and the second bending portion. Between the parts, one end of the second bent part away from the first bent part is connected to the second bolt extension part.

In this solution, with the above-mentioned structural arrangement, the lock base can realize the restriction of the lock tongue through the cooperation with the first bending portion, and prevent the lock tongue from continuing to rotate along the locking direction.

Preferably, when the bolt body is in the locked state, the first bending portion is attached to the top of the lock base, and the second bending portion is along the top of the lock base. The side wall extends, and a gap is formed between the second bent portion and the side wall of the lock base, and the range of the gap is 0-5 mm.

In this solution, the gap formed between the second bent portion and the side wall of the lock base is beneficial to prevent the lock tongue from being caught by the lock base, and is beneficial to further improve the reliability of power replacement. If the gap is too large, the locking mechanism will occupy a larger space, and the space utilization rate of the quick-change bracket will be lower. In addition, the space on the quick-change bracket is limited. If a single locking structure occupies a lot of space, it will affect the installation of other structures (such as the positioning mechanism for positioning the battery pack) or affect the number of installations of the locking mechanism. It is likely to reduce the installation reliability of the battery pack, which in turn will affect the success rate of battery replacement. It should be noted that the larger space occupied by the locking mechanism will also make the size of the positioning fork matched with the locking mechanism larger.

Preferably, an included angle is formed between the first bending portion and the second bending portion, and the included angle is greater than or equal to 90 degrees and less than 180 degrees.

Preferably, the locking mechanism further includes a resetting member, both ends of the resetting member are respectively connected to the lock base and the first bolt extension, and the resetting member can be elastically deformed for making The lock tongue rotates in a locking direction to reset from the unlocked state to the locked state.

In this solution, the reset component is provided to facilitate the resetting of the lock tongue from the unlocked state to the locked state, so that the battery pack is more convenient to install and lock, and the lock tongue will not easily change to the unlocked state under the action of the resetting component. Only more reliable.

Preferably, the locking mechanism further includes an elastic member, and the elastic member is at least partially located in the cavity;

Wherein, the elastic component includes an elastic pad, an elastic handle and an elastic head connected in sequence, the elastic pad is located in the cavity, the elastic pad is used to abut the lock shaft, and the elastic handle It passes through the lock base, and the wall of the lock base is clamped between the elastic pad and the elastic head.

In this solution, with the above-mentioned structure and arrangement, the elastic pad can prevent the lock shaft from rigidly colliding with the lock base. In addition, the elastic member can be firmly installed on the lock base. Among them, the elastic member is preferably made of rubber.

The present invention also provides a quick-change bracket assembly, including a quick-change bracket, characterized in that the quick-change bracket assembly further includes at least one locking mechanism for the battery pack described above, and the locking mechanism is connected to the quick-change bracket. Replace the inner side wall of the bracket.

Preferably, when the bolt body is in the locked state, along the thickness direction of the lock base, one end of the second bolt expansion part adjacent to the quick-change bracket is connected to the quick-change bracket. The gap between the inner side walls of the bracket is greater than 0 mm and less than or equal to 3 mm, and the gap between one end of the second bolt expansion portion adjacent to the battery pack and the outer side wall of the battery pack is greater than 0 mm and less than or equal to 3 mm.

In this solution, the above-mentioned structure is adopted. When the positioning fork and the locking mechanism are matched, the second locking tongue expansion part can more reliably prevent the positioning fork and the locking tongue from being misaligned without affecting the locking mechanism and quick change. The installation of the bracket will not affect the installation of the battery pack.

Preferably, the quick-change bracket has two oppositely arranged connecting beams, the number of the locking mechanism is two, and the two locking mechanisms are arranged oppositely and are respectively arranged on the inner side walls of the two connecting beams.

In this solution, the two sides of the battery pack are provided with locking mechanisms opposite to each other, which helps to ensure the stable and reliable installation of the battery pack, and further helps to improve the success rate of battery replacement.

The present invention also provides an electric vehicle, which is characterized in that it includes the above-mentioned quick-change bracket assembly.

On the basis of conforming to common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain preferred embodiments of the present invention.

The positive and progressive effects of the present invention are:

In the locking mechanism, the second bolt expansion part extends out of the first bolt expansion part. When the battery needs to be changed, the second bolt expansion part cooperates with the positioning fork. Compared with the prior art, the second lock The part of the tongue expansion part that extends from the first tongue expansion part increases the contact area between the bolt and the positioning fork, thereby reducing the possibility of the positioning fork being misaligned relative to the bolt, making it difficult for the positioning fork to fork the bolt and the battery In the side seams formed by the bag and/or quick-change bracket, therefore, the success rate of one-time battery exchange can be improved.

Description of the drawings

Fig. 1 is a schematic structural diagram of a locking mechanism for a battery pack according to a preferred embodiment of the present invention.

Fig. 2 is another structural schematic diagram of a locking mechanism for a battery pack according to a preferred embodiment of the present invention.

Fig. 3 is a partial structural diagram of a locking mechanism for a battery pack according to a preferred embodiment of the present invention, in which the second locking tongue expansion part is not shown.

Fig. 4 is a schematic structural diagram of a preferred embodiment of the present invention when the locking mechanism for the battery pack is matched with the positioning fork.

Fig. 5 is a schematic structural diagram of a lock tongue in a locking mechanism for a battery pack according to a preferred embodiment of the present invention.

Description of reference signs:

10 lock base

101 opening

102 Cavities

20 lock tongue

201 bolt body

202 The first bolt extension

203 Second bolt extension

204 first extension

205 second extension

206 First bending part

207 Second bending part

30 reset parts

40 elastic parts

401 elastic cushion

402 elastic handle

403 elastic head

50 positioning fork

Detailed ways

In the following, the present invention will be further described by way of embodiments in conjunction with the drawings, but the present invention is not limited to the scope of the following embodiments.

This embodiment discloses a locking mechanism for a battery pack. As shown in FIGS. 1-5, the locking mechanism includes a lock base 10 and a lock tongue 20. The lock base 10 has an opening 101 and a hollow extending from the opening 101. The cavity 102 and the opening 101 are used for the lock shaft installed in the battery pack to enter the cavity 102; the lock tongue 20 can rotate relative to the lock base 10 to switch between the unlocked state and the locked state. The bolt 20 includes a bolt body 201, a first bolt extension 202, and a second bolt extension 203 that are connected end to end. When the bolt 20 is in the locked state, the bolt body 201 can prevent the lock shaft from passing through the opening 101 Leaving the cavity 102, the bolt body 201 is located in the lock base 10, and the first bolt expanding portion 202 and the second bolt expanding portion 203 are located outside the lock base 10. Wherein, along the thickness direction of the lock base 10, at least one end of the second bolt expansion part 203 extends out of the first bolt expansion part 202.

In this embodiment, the second bolt expansion part 203 extends out of the first bolt expansion part 202. When the battery needs to be changed, the second bolt expansion part 203 cooperates with the positioning fork 50. Compared with the prior art, The part of the second tongue expansion portion 203 extending from the first tongue expansion portion 202 increases the contact area between the tongue 20 and the positioning fork 50, thereby reducing the possibility of the positioning fork 50 being misaligned relative to the tongue 20, so that The positioning fork 50 is not easy to fork into the side seam formed by the bolt 20, the battery pack and/or the quick-change bracket, and therefore, the success rate of one-time battery replacement can be improved. It should be noted that with the above-mentioned structure and arrangement, even if the positioning fork 50 is misaligned to a certain extent with respect to the second bolt extension 203, the second bolt extension 203 extends beyond the part of the first bolt extension 202 Under the action of, it is not easy to locate the fork 50, and it will not even fork into the side seam between the lock tongue 20 and the battery pack or the quick-change bracket.

In this embodiment, referring to FIGS. 1-5 to understand, along the thickness direction of the lock base 10, both ends of the second bolt expansion portion 203 extend out of the first bolt expansion portion 202.

Wherein, when the locking mechanism cooperates with the positioning fork 50, compared with the prior art, both ends of the second bolt extension 203 have a larger contact area with the positioning fork 50, which can further make the positioning fork 50 difficult. It is misaligned with the second tongue expansion part 203, and the positioning fork 50 is not easy to fork into the side seams on both sides of the tongue 20, which is beneficial to further improve the success rate of a battery replacement.

Further referring to Figures 1-5 to understand, the two ends of the second tongue expansion part extending out of the first tongue expansion part 202 are respectively the first extension part 204 and the second extension part 205, the first extension part 204 and The cross-sectional shape of the second extension portion 205 is the same. With this arrangement, the cross-sectional shape of the first extension 204 and the second extension 205 when mated with the positioning fork 50 is the same, which is beneficial to reduce the requirements on the positioning fork 50, and is beneficial to realize the positioning fork 50 and the second tongue extension 203. Reliable cooperation, correspondingly, is also conducive to improving the success rate of power exchange.

In fact, in this embodiment, the first extension 204 and the second extension 205 are symmetrically arranged with respect to the central axis of the first bolt extension 202. Such a configuration is beneficial to further reduce the requirements on the positioning fork 50, thereby helping to ensure the reliable cooperation between the positioning fork 50 and the second bolt extension portion 203, and further improving the success rate of battery replacement.

It should be noted that in other alternative embodiments, the first extension portion 204 and the second extension portion 205 may be configured as structures with different cross-sectional shapes, or the first extension portion 204 and the second extension portion 205 may have the same cross-sectional shape. , But the size is different, that is, it is not symmetrically arranged about the central axis of the first bolt extension 202.

Regarding the extension range of the second bolt extension 203, the present embodiment is configured such that along the thickness direction of the lock base 10, the second bolt extension 203 extends at most to be aligned with the outer edge of the lock base 10.

Among them, one side of the lock base 10 (hereinafter referred to as the "first side") is used to be mounted on the quick-change bracket, and the other side of the lock base 10 (hereinafter referred to as the "second side") is used to face the battery pack . Wherein, if the second tongue expansion portion 203 corresponding to the first side surface extends out of the first side surface, the second tongue expansion portion 203 will occupy a larger space for the locking mechanism, and the second tongue expansion portion 203 It is also easy to affect the installation of the lock base 10 and the quick-change bracket. If the second tongue expansion portion 203 corresponding to the second side surface extends out of the second side surface, the second tongue expansion portion 203 will occupy a larger space for the locking mechanism, and the second tongue expansion portion 203 is also easy to The battery pack is stuck, which will affect the success rate of battery replacement.

Further referring to FIGS. 1-5 to understand, the end of the second bolt extension 203 away from the first bolt extension 202 is an arc-shaped part, and the arc-shaped parts are evenly distributed along the thickness direction of the lock base 10.

With this arrangement, the part of the second bolt expansion part 203 that extends from the first bolt expansion part 202 and the part corresponding to the first bolt expansion part 202 are both the same arc-shaped part, so that the part along the lock base 10 In the thickness direction, the mating surfaces of the second tongue extension 203 and the positioning fork 50 are exactly the same, which is beneficial to reduce the requirements on the positioning fork 50, and is beneficial to improve the reliability of the positioning fork 50 and the second tongue extension 203. Performance, which in turn helps to improve the success rate of a battery exchange.

Specifically, in this embodiment, the end of the second bolt expansion portion 203 close to the first bolt expansion portion 202 has a planar structure.

In addition, in this embodiment, the first bolt expansion portion 202 and the second bolt expansion portion 203 are integrally formed. With this arrangement, the forming method of the bolt 20 is relatively simple, and the first bolt extension 202 and the second bolt extension 203 can be reliably joined without additional indirect structure or connection, which improves the bolt 20. The reliability of the lock mechanism reduces the space occupied by the locking mechanism and the overall weight.

It should be noted that in other alternative embodiments, the expansion of the first locking tongue 202 and the second locking tongue 20 can also be connected together by a connecting structure, and can be set as a detachable connection (such as a screw, a nut, etc.). Etc.), can also be set as a fixed connection (such as welding).

Further, in this embodiment, when the bolt 20 is in the locked state, the lowest point of the end of the second bolt extension 203 away from the first bolt extension 202 is located above the lowest point of the bolt body 201 . In other alternative embodiments, it can also be arranged that the lowest point of the end of the second bolt extension 203 away from the first bolt extension 202 and the lowest point of the bolt body 201 are on the same horizontal line.

Wherein, if the position of the lowest point of the second tongue expansion part 203 is too low, the positioning fork 50 is used to cooperate with the second tongue expansion part 203, so that the positioning fork 50 acts on the second tongue expansion part 203 to realize the battery When the bag is unlocked, the movement stroke of the lock tongue 20 is too large, which will take a long time to unlock, which easily affects the efficiency of battery replacement.

As shown in Figures 1-5, the first bolt expansion portion 202 is a bent structure and includes a first bending portion 206 and a second bending portion 207. The first bending portion 206 is connected to the bolt body 201 and the second bending portion 207. Among the bending portions 207, the end of the second bending portion 207 far away from the first bending portion 206 is connected to the second bolt expansion portion 203. Wherein, when the bolt body 201 is in the locked state, the first bending portion 206 is attached to the top of the lock base 10, the second bending portion 207 extends along the side wall of the lock base 10, and the second bending portion 207 A gap is formed between the folded portion 207 and the side wall of the lock base 10, and the range of the gap is 0-5 mm.

Wherein, the lock base 10 can realize the restriction of the lock tongue 20 through the cooperation with the first bending portion 206, and prevent the lock tongue 20 from continuing to rotate along the locking direction. The gap formed between the second bent portion 207 and the side wall of the lock base 10 is beneficial to prevent the lock tongue 20 from being caught by the lock base 10, and is beneficial to further improve the reliability of power replacement.

It should be noted that, as mentioned above, the gap is preferably set to be not greater than 5 mm. Among them, if the gap is too large, the locking mechanism will occupy a larger space, and the space utilization rate of the quick-change bracket will be lower. In addition, the space on the quick-change bracket is limited. If a single locking structure occupies a lot of space, it will affect the installation of other structures (such as the positioning mechanism for positioning the battery pack) or affect the number of installations of the locking mechanism. It is likely to reduce the installation reliability of the battery pack, which in turn will affect the success rate of battery replacement. It should be noted that the larger space occupied by the locking mechanism will also make the size of the positioning fork 50 matched with the locking mechanism larger.

It can be understood with reference to FIGS. 1-4 that an included angle is formed between the first bending portion 206 and the second bending portion 207. In this embodiment, the included angle is 90 degrees. In other alternative embodiments, the included angle can also be any value between 90 degrees and less than 180 degrees. In other alternative embodiments, the surface of the second bending portion 207 in contact with the lock base 10 is a curved surface.

As shown in Figures 1-4, the locking mechanism also includes a resetting member 30. Both ends of the resetting member 30 are respectively connected to the lock base 10 and the first bolt extension 202. The resetting member 30 can be elastically deformed for making The bolt 20 rotates in the locking direction to reset from the unlocked state to the locked state. Wherein, the resetting part 30 is provided to facilitate the resetting of the lock tongue 20 from the unlocked state to the locked state, so that the battery pack is more convenient to install and lock, and under the action of the resetting part 30, the lock tongue 20 will not easily change to the unlocked state. The locking is more reliable.

Furthermore, as shown in FIG. 3, the locking mechanism further includes an elastic component 40, and the elastic component 40 is at least partially located in the cavity 102. The elastic component 40 includes an elastic pad 401, an elastic handle 402, and an elastic head 403 connected in sequence. The elastic pad 401 is located in the cavity 102, the elastic pad 401 is used to abut the lock shaft, and the elastic handle 402 penetrates the lock. The base 10 and the wall of the lock base 10 are clamped between the elastic pad 401 and the elastic head 403. The elastic pad 401 can prevent the lock shaft from rigidly colliding with the lock base 10. In addition, the elastic member 40 can be firmly installed on the lock base 10. Among them, the elastic member 40 is preferably made of rubber.

This embodiment also discloses a quick-change bracket assembly. The quick-change bracket assembly includes a quick-change bracket (not shown in the figure) and at least one locking mechanism as described above, and the locking mechanism is connected to the inner side wall of the quick-change bracket.

When the bolt body 201 is in the locked state, along the thickness direction of the lock base 10, the gap between the end of the second bolt extension 203 adjacent to the quick-change bracket and the inner side wall of the quick-change bracket is greater than 0 mm and less than It is equal to 3 mm, and the gap between the end adjacent to the battery pack in the second bolt extension 203 and the outer side wall of the battery pack is greater than 0 mm and less than or equal to 3 mm.

In this solution, the above structure is adopted. When the positioning fork 50 cooperates with the locking mechanism, the second bolt extension 203 can more reliably prevent the positioning fork 50 and the bolt 20 from being misaligned without affecting the locking. The installation of the mechanism and the quick-change bracket will not affect the installation of the battery pack.

Wherein, the quick-change bracket has two oppositely arranged connecting beams, the number of the locking mechanism is two, and the two locking mechanisms are arranged oppositely and are respectively arranged on the inner side walls of the two connecting beams. In this embodiment, the two sides of the battery pack are provided with locking mechanisms opposite to each other, which helps to ensure the stable and reliable installation of the battery pack, and thus helps to improve the success rate of battery replacement.

It should be noted that in the quick-change bracket assembly, the locking mechanism can be used as a secondary lock in conjunction with the primary lock; the primary lock can refer to the "locking device" disclosed in the Chinese Patent Application Publication No. CN106427514A.

This embodiment also discloses an electric vehicle, which includes the aforementioned quick-change bracket assembly.

In the locking mechanism, the second bolt expansion part 203 extends out of the first bolt expansion part 202. When the battery needs to be replaced, the second bolt expansion part 203 cooperates with the positioning fork 50, which is compared with the prior art , The part of the second bolt expansion part 203 extending from the first bolt expansion part 202 increases the contact area between the bolt 20 and the positioning fork 50, thereby reducing the possibility of the positioning fork 50 being misaligned with respect to the bolt 20, This makes it difficult for the positioning fork 50 to fork into the side seam formed by the bolt 20, the battery pack and the quick-change bracket, and therefore, the success rate of one-time battery replacement can be improved.

Although the specific embodiments of the present invention are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

A locking mechanism for a battery pack includes a lock base and a lock tongue. The lock base has an opening and a cavity extending from the opening. The opening is used for a lock installed on the battery pack. The shaft enters the cavity; the lock tongue can rotate relative to the lock base to switch between the unlocked state and the locked state, characterized in that the lock tongue includes a lock tongue body and a second A lock tongue expansion part and a second lock tongue expansion part, when the lock tongue is in the locked state, the lock tongue body can prevent the lock shaft from leaving the cavity from the opening, and the lock The tongue body is located in the lock base, and the first lock tongue expansion portion and the second lock tongue expansion portion are located outside the lock base;

Wherein, along the thickness direction of the lock base, at least one end of the second bolt expansion part extends out of the first bolt expansion part.
The locking mechanism for a battery pack according to claim 1, wherein along the thickness direction of the lock base, the second lock tongue extension portion extends at most to the outside of the lock base Align the edges.
The locking mechanism for a battery pack according to claim 1 or 2, characterized in that, along the thickness direction of the lock base, both ends of the second bolt extension portion extend out of the first A bolt extension.
The locking mechanism for a battery pack according to claim 3, wherein the parts of the two ends of the second bolt expansion part that extend out of the first bolt expansion part are the first extension parts, respectively As with the second extension portion, the cross-sectional shape of the first extension portion and the second extension portion are the same.
4. The locking mechanism for a battery pack according to claim 4, wherein the first extension portion and the second extension portion are symmetrically arranged with respect to the central axis of the first bolt extension portion.
The locking mechanism for a battery pack according to at least one of claims 1 to 5, wherein the end of the second bolt expansion part that is far from the first bolt expansion part is an arc-shaped part , And along the thickness direction of the lock base, the arc-shaped portions are evenly distributed.
The locking mechanism for a battery pack according to at least one of claims 1-6, wherein the end of the second bolt expansion part close to the first bolt expansion part is a plane structure.
The locking mechanism for a battery pack according to at least one of claims 1-7, wherein the first bolt expansion part and the second bolt expansion part are integrally formed.
The locking mechanism for a battery pack according to at least one of claims 1-8, wherein when the lock tongue is in the locked state, the second lock tongue expansion portion is far away from the The lowest point of one end of the first bolt extension is located above the lowest point of the bolt body, or the lowest point of the end of the second bolt extension away from the first bolt extension is the same as The lowest point of the bolt body is on the same horizontal line.
The locking mechanism for battery packs according to at least one of claims 1-9, wherein the first locking tongue expansion portion is a bending structure and includes a first bending portion and a second bending portion Portion, the first bending portion is connected between the bolt body and the second bending portion, and the end of the second bending portion that is far from the first bending portion is connected to the first bending portion Two bolt extension department.
The locking mechanism for a battery pack according to claim 10, wherein when the lock tongue body is in the locked state, the first bending portion is attached to the lock base At the top, the second bent portion extends along the side wall of the lock base, and a gap is formed between the second bent portion and the side wall of the lock base, and the range of the gap It is 0～5mm.
The locking mechanism for a battery pack according to claim 10 or 11, wherein an included angle is formed between the first bending portion and the second bending portion, and the included angle is greater than Equal to 90 degrees and less than 180 degrees.
The locking mechanism for battery packs according to at least one of claims 1-12, wherein the locking mechanism further comprises a reset component, and two ends of the reset component are respectively connected to the lock base The seat and the first bolt extension part, the reset component can be elastically deformed, and is used to make the bolt rotate in the locking direction to reset from the unlocked state to the locked state.
The locking mechanism for a battery pack according to at least one of claims 1-13, wherein the locking mechanism further comprises an elastic member, and the elastic member is at least partially located in the cavity;

Wherein, the elastic component includes an elastic pad, an elastic handle and an elastic head connected in sequence, the elastic pad is located in the cavity, the elastic pad is used to abut the lock shaft, and the elastic handle It passes through the lock base, and the wall of the lock base is clamped between the elastic pad and the elastic head.
A quick-change bracket assembly, comprising a quick-change bracket, wherein the quick-change bracket assembly further includes at least one locking mechanism for a battery pack according to any one of claims 1-14, and The locking mechanism is connected to the inner side wall of the quick-change bracket.
The quick-change bracket assembly of claim 15, wherein when the lock tongue body is in the locked state, along the thickness direction of the lock base, the second lock tongue expansion portion The gap between the end adjacent to the quick-change bracket and the inner side wall of the quick-change bracket is greater than 0 mm and less than or equal to 3 mm. The gap between the outer side walls is greater than 0 mm and less than or equal to 3 mm.
The quick-change bracket assembly according to claim 15 or 16, wherein the quick-change bracket has two oppositely arranged connecting beams, the number of the locking mechanism is two, and the two locking mechanisms are opposite to each other. Are arranged and respectively arranged on the inner side walls of the two connecting beams.
An electric vehicle, characterized in that it comprises the quick-change bracket assembly according to any one of claims 15-17.