Lithium battery pack with replaceable battery cells

Abstract

The utility model discloses a lithium battery pack with replaceable battery cells, which is characterized in that the lithium battery pack comprises at least one local unit which can be detachably combined together, the local unit comprises an outer side frame body, the outer side frame body forms an inner accommodating space which is generally in a cubic shape, a base plate is arranged at the bottom of the outer side frame body, and a plurality of battery cells are arranged on the base plate. The containing space is divided into different inserting spaces through at least one set of structural parts in the vertical direction, clamping guide structures are arranged at the combination positions of the structural parts in the vertical direction and the base plate, and quick-change assemblies with the same number as the inserting spaces are inserted into the outer side frame body through the clamping guide structures. At least one battery cell is fixedly arranged in the quick-change assembly, and when the quick-change assembly is not inserted into the outer side frame body, the battery cell can be moved out from the upper surface or the side surface of the quick-change assembly. According to the scheme, when only part of the battery cells in the battery pack need to be replaced, only the faulted battery cells are moved out for replacement or maintenance, so that simple replacement of the battery cells of the lithium battery pack is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of power batteries, and particularly relates to a lithium battery pack with replaceable battery cells. Background Art

[0002] With the development of the new energy industry, the application of lithium batteries and lithium battery packs is becoming more and more extensive. A lithium battery pack is an aggregate formed by encapsulating a large number of battery cells. In a lithium battery pack, the common 18650 battery cell has a low voltage and a small storage capacity by itself; but through the encapsulation of the battery pack and the series, parallel or mixed connection between battery cells, a large battery that meets the requirements of a power battery or an energy storage system is formed.

[0003] After retrieval, some lithium battery pack solutions have emerged, such as: CN211700381U discloses a lithium battery pack, which includes a lithium battery pack main body. A second protective frame is installed on the upper surface of the lithium battery pack main body, and a first protective frame is installed on the lower surface of the lithium battery pack main body. The first protective frame and the second protective frame are fixedly installed by bolts, and first grooves are opened inside the first protective frame and the second protective frame; by designing a movable plate inside the first groove and an elastic pad on the upper surface of the movable plate, the problem that the upper and lower surfaces of the lithium battery pack are not easy to be elastically connected during installation is avoided, so that it is easy to be deformed and damaged by collision during use after installation. It can be tightly pressed and connected with the outside through the elastic pad and the inner surface of the mounting plate. When impacted by the outside, the first spring is driven to undergo elastic deformation. At this time, the movable plate slides on the outer surface of the sliding pin, so that the elastic pad and the movable plate are in a buffer state and are protected during collision.

[0004] However, in the current technical solutions, if there is an individual battery cell damaged in the battery pack encapsulated together, it is very troublesome to disassemble the packaging of the whole battery pack, replace the battery cell and re-seal it. Summary of the Utility Model

[0005] Aiming at the technical problem of difficult replacement of battery cells in a lithium battery pack, the utility model provides a lithium battery pack with replaceable battery cells. The technical solution adopted by the utility model is as follows:

[0006] A lithium battery pack with replaceable battery cells includes at least one local unit that can be detachably combined together. The local unit includes an outer frame body, which forms an internal accommodation space that is generally cubic in shape. A chassis is arranged at its bottom. The accommodation space is divided into different insertion spaces by at least one set of vertical structural members. A clamping and guiding structure is arranged at the position where the vertical structural members are combined with the chassis. Quick-change components with the same number as the insertion spaces are inserted into the outer frame body through the clamping and guiding structure. At least one battery cell is fixedly arranged in the quick-change component. When the quick-change component is not inserted into the outer frame body, the battery cell can be removed from the upper surface or side surface of the quick-change component.

[0007] Furthermore, the engaging guide structure is an insertion track extending along the insertion direction of the quick-change assembly, and the quick-change assembly is provided with a structural member that matches the insertion track.

[0008] Furthermore, the quick-change assembly includes a bottom combining block that supports the battery cells, and the bottom combining block is provided with holes that match the diameter of the battery cells; the quick-change assembly also includes a top combining block that corresponds to the position of the bottom combining block and combines the battery cells into one from another direction, and the top combining block is provided with a through hole with a diameter greater than the diameter of the battery cell corresponding to each battery cell; a connecting rod is provided between the bottom combining block and the top combining block, and the connecting rod maintains the distance between the bottom combining block and the top combining block.

[0009] Furthermore, a clearance opening is provided on the side wall of the battery cell through hole of the bottom connecting block, and the clearance openings are multiple and evenly distributed along the circumferential direction of the battery cell through hole; a locking structure is provided at the intervals of the clearance openings, and the locking structure has a locking state that fixes the battery cell in the quick-change assembly and an unlocking state that allows the battery cell to be freely moved out.

[0010] Furthermore, the locking structure is an insulating sheet installed on the top combining block by threaded fasteners.

[0011] Furthermore, the quick-change assembly also includes a connector that combines all the battery cells in the same quick-change assembly into a whole, and the connector is formed by two wave-shaped elements fixedly connected together, and each wave-shaped element has an inner arc on the inner side that matches the side profile of the battery cell. After the two wave-shaped elements are fixedly connected, the battery cell is accommodated in the hole formed by the inner arc; a ball head plunger is installed at each arc of the wave-shaped element through a threaded through hole, and the ball head plunger is a cylinder with an external thread, which is installed in the threaded through hole through the external thread, and a ball head padded with a spring is provided at the inward end, and the ball head presses against the side wall of the battery cell under the pressure of the spring.

[0012] Furthermore, the two ends of the quick-change assembly are respectively an introduction head and a locking head, the introduction head is provided with an introduction structure for inserting the quick-change device into the outer frame, the locking head is flush with the outer contour of the outer frame after the quick-change assembly is inserted into the outer frame, and the locking head is provided with a locking bolt, which together with the locking mechanism on the outer frame is locked after the quick-change assembly is inserted into the outer frame.

[0013] Furthermore, there are 8 quick-change assemblies, and each of the quick-change assemblies 8 has 6 battery cells.

[0014] Advantages of the present utility model: Among multiple battery cells already encapsulated in a lithium battery pack, if only a small number of battery cells need to be replaced, targeted replacement can be carried out without disassembling the entire battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 Structural schematic diagram of the present utility model;

[0017] Figure 2 Schematic diagram of the quick replacement component of the present application;

[0018] Figure 3 Partial enlarged view of the quick replacement component;

[0019] Figure 4 Top view of the overall device of the present application;

[0020] Figure 5 Side view of the overall device of the present application;

[0021] Figure 6 Top view of the quick replacement component according to the present application;

[0022] Figure 7 Bottom view of the quick replacement component;

[0023] Figure 8 For Figure 7 Side view.

[0024] REFERENCE NUMERALS

[0025] 1. Local unit

[0026] 11. Outer frame

[0027] 12. Chassis

[0028] 13. Insertion track

[0029] 14. Locking bolt

[0030] 15. Locking mechanism

[0031] 2. Quick replacement component

[0032] 21. Top coupling block

[0033] 22. Bottom coupling block

[0034] 23. Connecting rod

[0035] 24. Connecting body

[0036] 25. Relief opening

[0037] 26. Latching structure

[0038] 27. Guide track

[0039] 28. Ball plunger

[0040] 29. Introduction head

[0041] 3. Battery cell

[0042] 30. Locking head Detailed implementation manner

[0043] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] Note that the known series, parallel or mixed connection methods between battery cells and the corresponding electrode plates have been omitted.

[0045] A lithium battery pack with replaceable battery cells includes at least one local unit 1 that can be detachably combined together. The local unit includes an outer frame 11. The outer frame forms an internal accommodation space that is generally cubic in shape, and a chassis 12 is provided at its bottom. The accommodation space is divided into different insertion spaces by at least one group of vertical structural members. A latching and guiding structure is provided at the position where the vertical structural members are combined with the chassis. A quick-change assembly 2 with the same number as the insertion spaces is inserted into the outer frame 11 through the latching and guiding structure. At least one battery cell 3 is fixedly arranged in the quick-change assembly 2. When the quick-change assembly 2 is not inserted into the outer frame, the battery cell 3 can be removed from the top or side of the quick-change assembly 2.

[0046] Furthermore, the latching and guiding structure is an insertion track 13 extending along the insertion direction of the quick-change assembly 2, and a structural member that fits with the insertion track 13 is provided on the quick-change assembly 2.

[0047] In this solution, the replacement of the battery cell 3 is divided into two levels. First, the lithium battery pack is composed of multiple local units 1, each local unit includes several quick replacement components 2, and multiple battery cells 3 are fixed in each quick replacement component 2. At the first level, when a certain battery cell 3 needs to be replaced, first extract the quick replacement component 2 from the local unit 1, so that other battery cells 3 do not need to be disassembled. Secondly, the quick replacement component is set so that the battery cell 3 can be freely removed from above or below after being extracted (i.e., in the non-inserted state), that is, the faulty battery cell 3 can be removed without unlocking other battery cells 3 in the same quick replacement component 2 either.

[0048] Furthermore, the quick replacement component 2 includes a bottom bonding block 22 for carrying the battery cell 3, and holes matching the diameter of the battery cell 3 are provided on the bottom bonding block 22; the quick replacement component 2 also includes a top bonding block 21 corresponding to the position of the bottom bonding block 22, which combines the battery cells 3 into one body from another direction, and through holes with a diameter larger than the diameter of each battery cell 3 are provided on the top bonding block 21 corresponding to each battery cell 3; a connecting rod 23 is provided between the bottom bonding block 22 and the top bonding block 21, and the connecting rod maintains the distance between the bottom bonding block 22 and the top bonding block 21.

[0049] In this solution, the bottom bonding block, the top bonding block and the connecting rod form a stable whole, leaving the battery cell in a hollow cylindrical shape, and the holes in the top bonding block are through holes, so that the battery cell can be freely taken out after the quick replacement component is extracted, but after being inserted, it is in a stable installation state due to the block of the outer frame 11.

[0050] Furthermore, a relief opening 25 is also provided on the side wall of the battery cell through hole of the bottom bonding block 21, and the number of the relief openings 25 is multiple and they are evenly distributed along the circumferential direction of the battery cell through hole; a locking structure 26 is provided at the interval of the relief openings 25, and the locking structure 26 has a locked state for fixing the battery cell in the quick replacement component 2 and an unlocked state for enabling the battery cell to be freely removed.

[0051] Furthermore, the locking structure 26 is an insulating sheet installed on the top bonding block by a threaded fastener.

[0052] Furthermore, the quick-change assembly 2 also includes a connector 24 that combines all the battery cells 3 in the same quick-change assembly 2 into a whole. The connector 24 is formed by two wave-shaped elements fixedly connected together. Each wave-shaped element has an inner arc on the inner side that matches the side profile of the battery cell 3. After the two wave-shaped elements are fixedly connected together, the battery cell 3 is accommodated in the hole formed by the inner arc; a ball head plunger 28 is installed at each arc of the wave-shaped element through a threaded through hole. The ball head plunger 28 is a cylinder with an external thread, which is installed in the threaded through hole through the external thread. A ball head padded with a spring is provided at the inward end, and the ball head presses against the side wall of the battery cell under the pressure of the spring.

[0053] The design of the ball head plunger allows it to be stably limited in the connector when the battery cell does not need to be removed, and when it needs to be moved upward, the resistance to upward movement is very small due to the presence of the ball head.

[0054] Furthermore, the two ends of the quick-change assembly 2 are respectively provided with an introduction head 29 and a locking head 30, the introduction head 29 is provided with an introduction structure for inserting the quick-change device into the outer frame, the locking head is flush with the outer contour of the outer frame after the quick-change assembly 2 is inserted into the outer frame, and the locking head 30 is provided with a locking bolt 14, which is locked together with the locking mechanism 15 on the outer frame 11 after the quick-change assembly 2 is inserted into the outer frame.

[0055] Furthermore, there are 8 quick-change assemblies, and each of the quick-change assemblies 8 has 6 battery cells.

[0056] In this solution, when only some cells in the battery pack need to be replaced, the cell group in which they are located can be pulled out through the quick-change assembly, and then, without unpacking other cells, only the faulty cells can be removed for replacement or repair, thereby realizing simple replacement of lithium battery pack cells.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lithium battery pack with replaceable battery cells, characterized in that: It comprises at least one partial unit which can be detachably combined together, the partial unit comprising an outer frame, the outer frame constituting an internal accommodating space which is generally in the shape of a cube, a bottom of which is provided with a chassis, the accommodating space is divided into different insertion spaces by at least one group of vertical structural members, a snap-fit guide structure is provided at the position where the vertical structural members are combined with the chassis, quick-change assemblies having the same number as the insertion spaces are inserted into the outer frame through the snap-fit guide structure, at least one battery cell is fixedly provided in the quick-change assembly, and the battery cell can be removed from the top or side of the quick-change assembly when the quick-change assembly is not inserted into the outer frame.

2. The replaceable cell lithium battery pack according to claim 1, wherein: The engaging guide structure is an insertion track extending along the insertion direction of the quick-change assembly, and the quick-change assembly is provided with a structural member that matches the insertion track.

3. The lithium battery pack with replaceable battery cells according to claim 2, characterized in that: The quick-change assembly includes a bottom combining block for carrying the battery cells, and the bottom combining block is provided with holes matching the diameter of the battery cells; the quick-change assembly also includes a top combining block corresponding to the position of the bottom combining block, which combines the battery cells into one from another direction, and the top combining block is provided with a through hole having a diameter greater than the diameter of the battery cell corresponding to each battery cell; a connecting rod is provided between the bottom combining block and the top combining block, and the connecting rod maintains the distance between the bottom combining block and the top combining block.

4. The lithium battery pack with replaceable battery cells according to claim 3, characterized in that: A clearance opening is also provided on the side wall of the battery cell through hole of the bottom combining block, and the clearance openings are multiple and evenly distributed along the circumferential direction of the battery cell through hole; a locking structure is provided at the intervals of the clearance openings, and the locking structure has a locking state that fixes the battery cell in the quick-change assembly and an unlocking state that allows the battery cell to be freely moved out.

5. The lithium battery pack with replaceable battery cells according to claim 4, characterized in that: The locking structure is an insulating sheet mounted on the top combining block by a threaded fastener.

6. The lithium battery pack with replaceable battery cells according to claim 5, characterized in that: The quick-change assembly also includes a connector that combines all the battery cells in the same quick-change assembly into a whole. The connector is formed by two wave-shaped elements fixedly connected together. Each wave-shaped element has an inner arc on the inner side that matches the side profile of the battery cell. After the two wave-shaped elements are fixedly connected, the battery cell is accommodated in the hole formed by the inner arc; a ball head plunger is installed at each arc of the wave-shaped element through a threaded through hole. The ball head plunger is a cylinder with an external thread, which is installed in the threaded through hole through the external thread. A ball head padded with a spring is provided at the inward end, and the ball head presses against the side wall of the battery cell under the pressure of the spring.

7. The lithium battery pack with replaceable battery cells according to claim 6, characterized in that: The two ends of the quick-change assembly are respectively an introduction head and a locking head. The introduction head is provided with an introduction structure for inserting the quick-change device into the outer frame. The locking head is flush with the outer contour of the outer frame after the quick-change assembly is inserted into the outer frame. The locking head is provided with a locking bolt, which is locked together with the locking mechanism on the outer frame after the quick-change assembly is inserted into the outer frame.

8. The lithium battery pack with replaceable battery cells according to claim 7, wherein: There are 8 quick-change assemblies, and each of the quick-change assemblies has 6 battery cells.

Images