CN216288814U

CN216288814U - Lithium ion battery with multi-cavity structure

Info

Publication number: CN216288814U
Application number: CN202121811389.XU
Authority: CN
Inventors: 蒋水连
Original assignee: Shenzhen Center Power Tech Co Ltd
Current assignee: Shenzhen Center Power Tech Co Ltd
Priority date: 2021-08-03
Filing date: 2021-08-03
Publication date: 2022-04-12
Anticipated expiration: 2031-08-03

Abstract

The utility model provides a lithium ion battery with a multi-cavity structure, which comprises a shell, a plurality of single battery cells, a top cover, a first side plate, a second side plate and an integrated circuit board, wherein the shell is provided with a plurality of battery cells; a plurality of cavities are arranged on the shell side by side; connecting holes are formed in the two ends of the cavity; the single battery cell is matched with the cavity; a plurality of connecting grooves are formed in the two ends of the top cover, which are close to one side of the shell; the first side plate and the second side plate are both provided with a plurality of connecting convex protrusions matched with the connecting grooves. Through the plurality of cavities which are matched with the single battery cells and arranged on the shell, the battery PACK can be formed without additional PACK assembly, so that the cost of PACK assembly is saved; meanwhile, the use cost and the use threshold of the battery are also reduced. Through all adopting plastics injection moulding with casing, top cap, first curb plate and second curb plate, avoided taking place the short circuit between the monomer electricity core effectively, improved the security performance of battery.

Description

Lithium ion battery with multi-cavity structure

Technical Field

The utility model relates to the technical field of lithium ion batteries, in particular to a lithium ion battery with a multi-cavity structure.

Background

Compared with other batteries, the lithium ion battery has the advantages of long cycle, high specific capacity, small self-discharge, wide working range, high voltage, no pollution and the like, so that the lithium ion battery is widely applied to the fields of electric automobiles, electric bicycles, electric motorcycles, electric tools, energy storage systems and the like. Generally, lithium ion batteries are produced essentially as single units, and then PACK assembly is performed through a PACK production line to be applied to a specific occasion. In order to increase the energy density of lithium ion batteries, the casings of lithium ion batteries are very thin.

However, PACK assembly of the lithium ion battery requires a large amount of manpower and material resources, and the manufacturing cost is high; the lithium ion battery assembled by the PACK can be maintained or replaced by professional personnel, so that the use cost and the use threshold are improved invisibly; and most of the existing lithium ion battery shells are aluminum alloy shells, so that short circuit and electric leakage accidents are easy to happen between single battery cores.

SUMMERY OF THE UTILITY MODEL

Based on the above, the utility model provides a lithium ion battery with a multi-cavity structure, and aims to solve the problems that a large amount of manpower and material resources are consumed for PACK assembly of the lithium ion battery, and the manufacturing cost is high; the lithium ion battery assembled by the PACK can be maintained or replaced by professional personnel, so that the use cost and the use threshold are improved invisibly; and most of the existing lithium ion battery shells are aluminum alloy shells, so that short circuit and electric leakage accidents are easy to happen between single battery cores.

In order to achieve the purpose, the utility model provides the following technical scheme:

a lithium ion battery with a multi-cavity structure comprises a shell, a plurality of single battery cells, a top cover, a first side plate, a second side plate and an integrated circuit board; a plurality of cavities are arranged on the shell side by side; connecting holes are formed in the two ends of the cavity; the single battery cell is matched with the cavity; the top cover covers the single battery cells and is arranged at the top of the shell; the first side plate and the second side plate are respectively arranged at two opposite sides of the shell; the integrated circuit board is arranged between the shell and the second side plate; the plurality of single battery cells are connected in series through riveting blocks to form a battery cell group; a drainage terminal is arranged between the riveting block and the shell; the current-guiding terminal is electrically connected with the integrated circuit board; a plurality of connecting grooves are formed in the two ends of the top cover, which are close to one side of the shell; the first side plate and the second side plate are both provided with a plurality of connecting convex protrusions matched with the connecting grooves.

In this application, the cavity quantity that sets up on the casing can carry out corresponding design according to customer's demand to battery voltage or electric current.

Furthermore, a connecting assembly is arranged on a tab of the single battery cell; the connecting assembly comprises a connecting sheet, a rivet and a first sealing ring; one end of the connecting sheet is connected with a lug of the single battery cell, and the other end of the connecting sheet is connected with the rivet; one end of the rivet, which is far away from the connecting sheet, sequentially penetrates through the first sealing ring and the connecting hole and then is connected with the riveting block.

In the application, the positive electrode lug and the negative electrode lug of each single battery cell are provided with connecting components; in order to facilitate the series connection of a plurality of the monomer electric cores, regarding two adjacent monomer electric cores, one of the monomer electric cores is rotated 180 degrees relative to the other monomer electric core, so that a positive electrode tab of one of the monomer electric cores and a negative electrode tab of the other monomer electric core are arranged on the same side, and then the riveting block is used for connecting the connecting assemblies arranged on the electrode tabs in series. It should be noted that, after a plurality of the monomer battery cells are connected in series to form the battery core group, two of the outermost monomer battery cells have an electrode as the electrode of the battery core group, and therefore, the riveting block connected with the electrode of the battery core group is used as the pole of the battery core group

Furthermore, a plurality of explosion-proof holes which correspond to the cavities one by one are formed in the top cover; an explosion-proof assembly is arranged in the explosion-proof hole; the explosion-proof assembly comprises a plug, an explosion-proof sheet and a second sealing ring which are arranged from top to bottom.

Further, the plug is in interference fit with the explosion-proof hole; the surface of end cap is provided with anti-skidding line for increase frictional force, work as the end cap is installed behind the explosion-proof hole, the end cap rely on with the frictional force stopping between the explosion-proof hole has prevented effectively the end cap is followed drop in the explosion-proof hole, realizes sealed and explosion-proof of battery.

Further, internal threads are arranged in the explosion-proof hole; and the outer surface of the plug is provided with an external thread matched with the internal thread. Through the matching between the internal thread and the external thread, the plug can be stably installed in the explosion-proof hole.

Further, the plug is a metal plug or a plastic plug; the explosion-proof piece is a metal explosion-proof piece, so that the explosion-proof pressure value of the explosion-proof assembly is stable and reliable.

In this application, the explosion-proof hole can also regard as annotates the liquid hole, can pass through electrolyte earlier in the actual operation the explosion-proof hole is injected into in the cavity, then will explosion-proof subassembly is installed explosion-proof downthehole, the completion is sealed.

Further, a BMS module and a balancing module are arranged on the integrated circuit board; the input end of the balancing module is electrically connected with the current-guiding terminal, and the output end of the balancing module is electrically connected with the BMS module. The equalization module can accurately detect and collect each voltage, current and temperature of the single battery cell, and sends collected information to the BMS module, and in the battery charging and discharging process, the BMS module can timely cut off the current of overcharge and overdischarge, so as to protect the battery cell.

Further, the housing is fixed in abutment with the top cover by heat fusion. The shell and the top cover are welded and sealed in a hot melting mode, and the shell has the advantages of long service life, good sealing performance, corrosion resistance and the like, so that the reliability and the durability of connection of the shell and the top cover are improved.

Furthermore, the same end of the top cover is also provided with a positive terminal and a negative terminal; one end of the positive terminal is connected with the positive post of the electric core group, and the other end of the positive terminal penetrates through the top cover to extend outwards; one end of the negative terminal is connected with the negative pole column of the battery pack, and the other end of the negative terminal penetrates through the top cover to extend outwards. And the positive terminal and the negative terminal are used as output ends of the battery and are connected with the outside.

In the embodiment of the present application, when the riveting block serving as the electrode of the electric core assembly is connected to the positive electrode terminal/negative electrode terminal, the riveting block connected to the positive electrode terminal/negative electrode terminal is designed to have a bent shape in consideration of the space utilization rate inside the battery and also in order to ensure the connection stability.

Further, the housing, the top cover, the first side plate and the second side plate are all plastic. The plastic is an insulator, so that the danger of short circuit or electric leakage between the single electric cores can be effectively avoided, and the plastic is durable and low in cost, so that the service life of the battery is prolonged, and the production cost of the battery is saved.

According to the lithium ion battery with the multi-cavity structure, the plurality of cavities matched with the single battery cells are formed in the shell, so that a battery PACK can be formed without additional PACK assembly, and the cost of PACK assembly is saved; meanwhile, the use cost and the use threshold of the battery are also reduced. Through all adopting plastics injection moulding with casing, top cap, first curb plate and second curb plate, avoided taking place the short circuit between the monomer electricity core effectively, improved the security performance of battery. The utility model has the advantages of simple structure, small volume, large capacity, light weight, high energy density and low cost.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is an exploded view of a multi-chamber lithium ion battery according to an embodiment of the present invention;

FIG. 2 is a perspective view of the housing of FIG. 1;

FIG. 3 is a bottom view of the top cover of FIG. 1;

FIG. 4 is a perspective view of the connecting assembly of FIG. 1;

fig. 5 is a perspective view of the explosion-proof assembly of fig. 1.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, back, top and bottom … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

At present, a large amount of manpower and material resources are consumed for PACK assembly of the lithium ion battery, and the manufacturing cost is high; the lithium ion battery assembled by the PACK can be maintained or replaced by professional personnel, so that the use cost and the use threshold are improved invisibly; and most of the existing lithium ion battery shells are aluminum alloy shells, so that short circuit and electric leakage accidents are easy to happen between single battery cores. In order to solve the technical problem, the utility model provides a lithium ion battery with a multi-cavity structure.

As shown in fig. 1 to fig. 3, a lithium ion battery with a multi-cavity structure according to an embodiment of the present invention includes a housing 1, a plurality of single battery cells 2, a top cover 3, a first side plate 4, a second side plate 5, and a integrated circuit board 6; a plurality of cavities 11 are arranged on the shell 1 side by side; two ends of the cavity 11 are provided with connecting holes 12; the single battery cell 2 is matched with the cavity 11; the top cover 3 is arranged at the top of the shell 1 after covering the single battery cells 2; the first side plate 4 and the second side plate 5 are respectively arranged at two opposite sides of the shell 1; the integrated circuit board 6 is arranged between the shell 1 and the second side plate 5; a plurality of single battery cores 2 are connected in series through riveting blocks 7 to form a battery core group 8; a drainage terminal 71 is arranged between the riveting block 7 and the shell 1; the current leading terminal 71 is electrically connected with the integrated circuit board 6; a plurality of connecting grooves 31 are formed in the two ends of the top cover 3 close to one side of the shell 1; the first side plate 4 and the second side plate 5 are both provided with a plurality of connecting protrusions 41 matched with the connecting grooves 31.

In the embodiment of the present application, the number of the cavities 11 disposed on the housing 1 may be designed according to the requirement of the customer on the voltage or current of the battery. Through the tight fit between the connecting groove 31 and the connecting protrusion 41, the top cover 3 can be stably installed on the housing 1, and meanwhile, the top cover 3 can play a certain fastening role for the electric core group 8.

In the embodiment of the present application, the current leading terminal 71 is only arranged between the riveting block 7 for connecting the two single electric cores 2 and the casing 1; the current leading terminal 71 is convenient to weld, and cannot cause damage to the housing 1 due to welding.

Referring to fig. 4, in the embodiment of the present application, a connection assembly 21 is disposed on a tab of each cell 2; the connecting component 21 comprises a connecting sheet 211, a rivet 212, a first sealing ring 213 and a drainage terminal 214; one end of the connecting piece 211 is connected with a tab of the single battery cell 2, and the other end is connected with the rivet 212; one end of the rivet 212, which is far away from the connecting piece 211, sequentially penetrates through the first sealing ring 213 and the connecting hole 12 and then is connected with the riveting block 7.

In the embodiment of the present application, the positive electrode tab and the negative electrode tab of the individual electric core 2 are both provided with a connecting assembly 21; in order to facilitate the series connection of a plurality of the monomer electric cores 2, regarding two adjacent monomer electric cores 2, one of the monomer electric cores 2 is rotated 180 degrees relative to the other monomer electric core 2, so that a positive electrode tab of one of the monomer electric cores 2 is arranged on the same side as a negative electrode tab of the other monomer electric core 2, and then the riveting block 7 is used to connect the connecting assemblies 21 arranged on the electrode tabs in series. It should be noted that after a plurality of the single battery cells 2 are connected in series to form the battery core group 8, two of the outermost single battery cells 2 each have an electrode as the electrode of the battery core group 8, and therefore, the riveting block 7 connected to the electrode of the battery core group 8 serves as the terminal of the battery core group 8.

Referring to fig. 1 and 5, in the embodiment of the present application, a plurality of explosion-proof holes 32 corresponding to the cavities 11 one to one are formed in the top cover 3; an explosion-proof assembly 33 is arranged in the explosion-proof hole 32; the explosion-proof assembly 33 comprises a plug 331, an explosion-proof sheet 332 and a second sealing ring 333 which are arranged from top to bottom.

In the embodiment of the present application, the plug 331 is in interference fit with the explosion-proof hole 32; the outer surface of the plug 331 is provided with anti-slip threads 334 for increasing friction force, when the plug 331 is installed behind the explosion-proof hole 32, the plug 331 depends on and is stopped by the friction force between the explosion-proof holes 32, so that the plug 331 is effectively prevented from falling from the explosion-proof hole 32, and the sealing and explosion-proof of the battery are realized. In other embodiments, internal threads are provided within the blast hole 32; the outer surface of the plug 331 is provided with an external thread matched with the internal thread. Through the matching between the internal thread and the external thread, the plug 331 can be stably installed in the explosion-proof hole 32.

In the embodiment of the present application, the plug 331 is a metal plug or a plastic plug; the explosion-proof sheet 332 is a metal explosion-proof sheet, so that the explosion-proof pressure value of the explosion-proof assembly 33 is stable and reliable.

In this application embodiment, explosion-proof hole 32 can also regard as annotating the liquid hole, can pass through electrolyte earlier in the actual operation explosion-proof hole 32 pours into in the cavity, then will explosion-proof subassembly 33 is installed in explosion-proof hole 32, the completion is sealed.

In the embodiment of the present application, the integrated circuit board 6 is provided with a BMS module (not shown) and an equalization module (not shown); the input end of the balancing module is electrically connected to the current lead terminal 214, and the output end of the balancing module is electrically connected to the BMS module. The balanced module can accurately detect and gather every voltage, electric current and the temperature of monomer electricity core 2 to with the information transmission who gathers to the BMS module, at 2 charge-discharge in-process of battery, the BMS module can be timely cut off the electric current of overcharge and overdischarge, and then play the effect of protection electric core.

In the embodiment of the present application, the housing 1 is fixed in abutment with the top cover 3 by heat fusion. Make through the mode of hot melt casing 1 with the butt cap 3 butt fusion is sealed, has advantages such as long service life, sealing performance are good, corrosion-resistant to improve reliability and the durability of both connections.

Referring to fig. 1 again, in the embodiment of the present application, the same end of the top cover 3 is further provided with a positive terminal 91 and a negative terminal 92; one end of the positive terminal 91 is connected with the positive post of the electric core group 8, and the other end of the positive terminal penetrates through the top cover 3 and extends outwards; one end of the negative terminal 92 is connected to the negative pole of the battery pack 8, and the other end of the negative terminal passes through the top cap 3 and extends outwards. And the positive terminal and the negative terminal are used as output ends of the battery and are connected with the outside.

In the embodiment of the present application, when the riveting block 7 serving as the electrode of the electric core pack 8 is connected to the positive terminal 91/negative terminal 92, the riveting block 7 connected to the positive terminal 91/negative terminal 92 is designed to have a bent shape in consideration of space utilization inside the battery and also in order to ensure connection stability.

In the embodiment of the present application, the housing 1, the top cover 3, the first side plate 4, and the second side plate 5 are all made of plastic. The plastic is an insulator, so that the danger of short circuit or electric leakage between the single electric cores can be effectively avoided, and the plastic is durable and low in cost, so that the service life of the battery is prolonged, and the production cost of the battery is saved.

According to the lithium ion battery with the multi-cavity structure, provided by the embodiment of the utility model, the battery PACK 8 can be formed by arranging the plurality of cavities 11 matched with the single battery cells 2 on the shell 1 without performing additional PACK assembly, so that the cost of PACK assembly is saved; meanwhile, the use cost and the use threshold of the battery are also reduced. Through all adopting plastics injection moulding with casing 1, top cap 3, first curb plate 4 and second curb plate 5, avoided taking place the short circuit between monomer electric core 2 effectively, improved the security performance of battery. The utility model has the advantages of simple structure, small volume, large capacity, light weight, high energy density and low cost.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the technical solutions of the present invention, which are made by using the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A lithium ion battery with a multi-cavity structure is characterized by comprising a shell, a plurality of single battery cells, a top cover, a first side plate, a second side plate and an integrated circuit board; a plurality of cavities are arranged on the shell side by side; connecting holes are formed in the two ends of the cavity; the single battery cell is matched with the cavity; the top cover covers the single battery cells and is arranged at the top of the shell; the first side plate and the second side plate are respectively arranged at two opposite sides of the shell; the integrated circuit board is arranged between the shell and the second side plate; the plurality of single battery cells are connected in series through riveting blocks to form a battery cell group; a drainage terminal is arranged between the riveting block and the shell; the current-guiding terminal is electrically connected with the integrated circuit board; a plurality of connecting grooves are formed in the two ends of the top cover, which are close to one side of the shell; the first side plate and the second side plate are both provided with a plurality of connecting convex protrusions matched with the connecting grooves.

2. The lithium ion battery with the multi-cavity structure according to claim 1, wherein a connecting assembly is arranged on the tabs of the single battery cells; the connecting assembly comprises a connecting sheet, a rivet and a first sealing ring; one end of the connecting sheet is connected with a lug of the single battery cell, and the other end of the connecting sheet is connected with the rivet; one end of the rivet, which is far away from the connecting sheet, sequentially penetrates through the first sealing ring and the connecting hole and then is connected with the riveting block.

3. The lithium ion battery with the multi-cavity structure according to claim 1, wherein the top cover is provided with a plurality of explosion-proof holes corresponding to the cavities one by one; an explosion-proof assembly is arranged in the explosion-proof hole; the explosion-proof assembly comprises a plug, an explosion-proof sheet and a second sealing ring which are arranged from top to bottom.

4. The multi-cavity lithium ion battery according to claim 3, wherein the plug is in interference fit with the explosion-proof hole; the outer surface of the plug is provided with anti-skid lines;

or, an internal thread is arranged in the explosion-proof hole; and the outer surface of the plug is provided with an external thread matched with the internal thread.

5. The lithium ion battery with a multi-cavity structure according to claim 3, wherein the plug is a metal plug or a plastic plug; the explosion-proof sheet is a metal explosion-proof sheet.

6. The lithium ion battery with a multi-cavity structure according to claim 1, wherein a BMS module and an equalization module are arranged on the integrated circuit board; the input end of the balancing module is electrically connected with the current-guiding terminal, and the output end of the balancing module is electrically connected with the BMS module.

7. The multi-chamber lithium ion battery of claim 1, wherein the housing is secured against the top cover by heat staking.

8. The lithium ion battery with a multi-cavity structure according to claim 1, wherein a positive terminal and a negative terminal are further arranged at the same end of the top cover; one end of the positive terminal is connected with the positive post of the electric core group, and the other end of the positive terminal penetrates through the top cover to extend outwards; one end of the negative terminal is connected with the negative pole column of the battery pack, and the other end of the negative terminal penetrates through the top cover to extend outwards.

9. The multi-chamber lithium ion battery of claim 1, wherein the housing, the top cover, the first side plate, and the second side plate are all plastic.