A lithium-ion battery with a multi-chamber structure

Abstract

A lithium-ion battery with a multi-chamber structure proposed by the present invention includes a housing, a battery cell group, a top cover, a first side plate, a second side plate, and an integrated circuit board; the battery cell group is arranged inside the housing; the battery cell group includes a plurality of single battery cells arranged side by side inside the housing, a plurality of connection components, and riveting blocks; one end of the connection component is connected to the tab of the single battery cell, and the other end passes through the housing and is connected to the riveting block; the plurality of single battery cells are connected in series through the riveting blocks; the connection component is electrically connected to the integrated circuit board. By providing a plurality of chambers on the housing that are adapted to the single battery cells, a battery pack can be formed without additional PACK assembly, saving the cost of PACK assembly. By using plastic injection molding for the housing, the top cover, the first side plate, and the second side plate, short circuits between the single battery cells are effectively avoided, and the safety performance of the battery is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium ion batteries, and in particular to a lithium ion battery with a multi-cavity structure. Background Art

[0002] Compared with other batteries, lithium-ion batteries have the advantages of long cycle, high specific capacity, low self-discharge, wide operating range, high voltage and no pollution, so they are widely used in electric vehicles, electric bicycles, electric motorcycles, electric tools and energy storage systems. Generally, lithium-ion batteries are basically produced as single cells, and then need to be assembled through the PACK production line before they can be used in specific occasions. In order to increase the energy density of lithium-ion batteries, the shells of lithium-ion batteries are very thin.

[0003] However, the PACK assembly of lithium-ion batteries requires a lot of manpower and material resources, and the manufacturing cost is high; the lithium-ion batteries assembled by PACK need to be repaired or replaced by professionals, which invisibly increases the cost and threshold of use; and most of the existing lithium-ion battery shells are aluminum alloy shells, which makes it easy for short circuits to occur between single cells, resulting in leakage accidents. Summary of the invention

[0004] Based on this, the present invention provides a lithium-ion battery with a multi-cavity structure, aiming to solve the problem that the PACK assembly of lithium-ion batteries requires a lot of manpower and material resources and has high manufacturing costs; the lithium-ion batteries assembled by PACK require professionals to repair or replace, which invisibly increases the cost and threshold of use; and most of the existing lithium-ion battery shells are aluminum alloy shells, which makes it easy for short circuits to occur between single cells, resulting in leakage accidents.

[0005] To achieve the above object, the present invention proposes the following technical solutions:

[0006] A lithium-ion battery with a multi-cavity structure comprises a shell, a battery cell group, a top cover, a first side plate, a second side plate and an integrated circuit board; the battery cell group comprises a plurality of single battery cells connected in series by riveting blocks; a plurality of cavities adapted to the single battery cells are arranged side by side on the shell; the top cover is arranged on the top of the shell after covering the battery cell group; the first side plate and the second side plate are respectively arranged on opposite sides of the shell; the integrated circuit board is arranged between the shell and the second side plate; a drainage terminal is also arranged between the riveting block and the outer side wall of the shell; the drainage terminal is electrically connected to the integrated circuit board.

[0007] In the present application, the cavity is used to install the single battery cell and can be designed accordingly according to user needs.

[0008] Further, a connection assembly is provided on the tab of the single-cell battery; the connection assembly includes a connecting piece, a rivet, and a first sealing ring; one end of the connecting piece is connected to the tab of the single-cell battery, and the other end is connected to the rivet; the end of the rivet away from the connecting piece sequentially passes through the first sealing ring and the housing and then is connected to the riveting block.

[0009] Further, the connecting piece includes a first connecting portion and a second connecting portion connected to the first connecting portion; one end of the first connecting portion away from the second connecting portion is connected to the rivet; one end of the second connecting portion away from the first connecting portion is connected to the tab of the single-cell battery.

[0010] Further, a folding structure is provided at one end of the first connecting portion close to the second connecting portion.

[0011] Further, the second connecting portion includes a first pole piece and a second pole piece arranged in parallel; one end of the first pole piece is connected to the first connecting portion, and the other end is connected to the tab of the single-cell battery; one end of the second pole piece is connected to the first connecting portion, and the other end is connected to the tab of the single-cell battery.

[0012] In this application, connection assemblies are provided on both the positive tab and the negative tab of the single-cell battery; to facilitate the series connection of multiple single-cell batteries, for two adjacent single-cell batteries, one of the single-cell batteries is rotated 180 degrees relative to the other single-cell battery, so that the positive tab of one single-cell battery and the negative tab of the other single-cell battery are arranged on the same side, and then the corresponding connection assemblies are connected with the riveting block.

[0013] Further, a plurality of explosion-proof holes corresponding to the cavities one by one are provided on the top cover; an explosion-proof assembly is provided in the explosion-proof hole; the explosion-proof assembly includes a plug, an explosion-proof sheet, and a second sealing ring arranged from top to bottom.

[0014] Further, the plug is in interference fit with the explosion-proof hole; an anti-slip pattern is provided on the outer surface of the plug. The anti-slip pattern is used to increase the friction force. When the plug is installed in the explosion-proof hole, the plug relies on the friction force between it and the explosion-proof hole to prevent retraction and falling, realizing the sealing and explosion-proof of the battery.

[0015] Further, internal threads are provided in the explosion-proof hole; external threads adapted to the internal threads are provided on the outer surface of the plug. Through the cooperation between the internal threads and the external threads, the plug can be stably installed in the explosion-proof hole.

[0016] Further, the plug is a metal plug or a plastic plug; the explosion-proof sheet is an aluminum alloy explosion-proof sheet, so that the explosion-proof pressure value of the explosion-proof component is stable and reliable.

[0017] In the present application, the explosion-proof hole can also be used as a liquid injection hole. In actual operation, the electrolyte can be first injected into the battery through the explosion-proof hole, and then the explosion-proof component can be installed in the explosion-proof hole.

[0018] Further, a BMS module and a balancing module are provided on the integrated circuit board; the input end of the balancing module is electrically connected to the current-carrying terminal, and the output end of the balancing module is electrically connected to the BMS module. The balancing module can accurately detect and collect the voltage, current and temperature of each single cell through the current-carrying terminal, and send the collected information to the BMS module. During the charging and discharging process of the battery, the BMS module can timely cut off the overcharge and over-discharge current, thereby playing a role in protecting the battery cells.

[0019] Further, the housing is fixedly abutted against the top cover by hot melting. By means of hot melting, the housing and the top cover are welded and sealed, which has the advantages of long service life, good sealing performance, corrosion resistance, etc., thereby improving the reliability and durability of the connection between the two.

[0020] Further, a positive terminal and a negative terminal are also provided at the same end of the top cover; one end of the positive terminal is connected to the positive electrode of the battery cell group, and the other end extends outwards through the top cover; one end of the negative terminal is connected to the negative electrode of the battery cell group, and the other end extends outwards through the top cover. The positive terminal and the negative terminal serve as the output terminals of the battery and are connected to the outside.

[0021] In the present application, each of the two outermost single cells of the battery cell group has a tab as the electrode of the battery cell group. At the same time, one end of the riveting block connected to the tab is connected to the corresponding connection component, and the other end is connected to the positive terminal / negative terminal, thereby forming the positive and negative electrodes of the battery. In addition, considering the space utilization rate inside the battery and also to ensure the connection stability, the riveting block connected to the positive terminal / negative terminal is designed in a bent shape.

[0022] Further, the housing, the top cover, the first side plate and the second side plate are all made of plastic. Plastic is an insulator, which can effectively avoid the danger of short circuit or electric leakage between single cells, and plastic is more durable and has low cost, thus improving the service life of the battery and saving the production cost of the battery.

[0023] A lithium-ion battery with a multi-cavity structure proposed by the present invention can form a battery pack without additional PACK assembly by arranging a plurality of cavities adapted to monomer cells on the housing, saving the cost of PACK assembly. By using plastic injection molding for the housing, top cover, first side plate and second side plate, the occurrence of short circuits between monomer cells is effectively avoided, and the safety performance of the battery is improved. The structure of the present invention is simple, small in size, large in capacity, light in weight, high in energy density and low in cost. Brief Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention 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 following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0025] Figure 1 It is an exploded view of the lithium-ion battery with a multi-cavity structure according to the embodiment of the present invention;

[0026] Figure 2 is Figure 1 a three-dimensional structure diagram of the connection component in

[0027] Figure 3 is Figure 2 a three-dimensional structure diagram of the connecting piece in

[0028] Figure 4 is Figure 1 a top view after the explosion is released;

[0029] Figure 5 is Figure 4 a cross-sectional view along the A-A direction in

[0030] Figure 6 is Figure 5 an enlarged view of the partial B in

[0031] Figure 7 is Figure 1 an exploded view of the explosion-proof component in

[0032] The realization of the purpose, functional characteristics and advantages of the present invention will be further described with reference to the embodiments and the drawings. Detailed Embodiments

[0033] 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 making creative efforts belong to the scope of protection of the present invention.

[0034] It should be noted that if there are directional indications (such as up, down, left, right, front, back, top, bottom...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0035] In this application, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0036] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] At present, the PACK assembly of lithium-ion batteries requires a lot of manpower and material resources, and the manufacturing cost is high; the lithium-ion batteries assembled by PACK require professionals to repair or replace, which invisibly increases the cost and threshold of use; and most of the existing lithium-ion battery shells are aluminum alloy shells, which makes it easy for short circuits to occur between single cells, resulting in leakage accidents. In order to solve the above technical problems, the present invention proposes a lithium-ion battery with a multi-cavity structure.

[0039] like Figure 1 As shown, a lithium-ion battery with a multi-cavity structure proposed in an embodiment of the present invention comprises a shell 1, a battery cell group 2, a top cover 3, a first side plate 4, a second side plate 5 and an integrated circuit board 6; the battery cell group 2 comprises a plurality of single battery cells 21 arranged in series through a rivet block 7; a plurality of cavities 11 adapted to the single battery cells 21 are arranged side by side on the shell 1; the top cover 3 is arranged on the top of the shell 1 after covering the battery cell group 2; the first side plate 4 and the second side plate 5 are respectively arranged on opposite sides of the shell 1; the integrated circuit board 6 is arranged between the shell 1 and the second side plate 5; a drainage terminal 71 is also arranged between the rivet block 7 and the outer side wall of the shell 1; the drainage terminal 71 is electrically connected to the integrated circuit board 6.

[0040] In the embodiment of the present application, the cavity 11 is used to install the single battery cell 21 and can be designed accordingly according to user needs. A current drain terminal 71 is provided between each riveting block 7 and the housing 1, and the current drain terminal 71 is conducive to welding and will not damage the housing 1 due to welding.

[0041] Reference Figure 2 , Figure 4 , Figure 5 and Figure 6 In the embodiment of the present application, a connecting component 22 is provided on the pole ear of the single battery cell 21; the connecting component 22 includes a connecting piece 221, a rivet 222 and a first sealing ring 223; one end of the connecting piece 221 is connected to the pole ear of the single battery cell 21, and the other end is connected to the rivet 222; the end of the rivet 222 away from the connecting piece 221 passes through the first sealing ring 223 and the shell 1 in sequence and is connected to the riveting block 7.

[0042] Reference Figure 3 In the embodiment of the present application, the connecting piece 221 includes a first connecting portion 2211 and a second connecting portion 2212 connected to the first connecting portion 2211; one end of the first connecting portion 2211 away from the second connecting portion 2212 is connected to the rivet 222; and one end of the second connecting portion 2212 away from the first connecting portion 2211 is connected to the pole ear of the single cell 21.

[0043] One end of the first connecting portion 2211 close to the second connecting portion 2212 is provided with a folding structure 2213. The folding structure 2213 facilitates welding and can simplify the welding process.

[0044] The second connecting portion 2212 includes a first pole piece 2214 and a second pole piece 2215 arranged in parallel; one end of the first pole piece 2214 is connected to the first connecting portion 2211, and the other end is connected to the tab of the single cell 21; one end of the second pole piece 2215 is connected to the first connecting portion 2211, and the other end is connected to the tab of the single cell 21. Arranging the second connecting portion 2212 as two parallel pole pieces is beneficial to improving space utilization and expansion.

[0045] In the embodiment of the present application, connection assemblies 22 are provided on both the positive tab and the negative tab of the single cell 21; for facilitating the series connection of multiple single cells 21, for two adjacent single cells 21, one of the single cells 21 is rotated 180 degrees relative to the other single cell 21, so that the positive tab of one of the single cells 21 and the negative tab of the other single cell 21 are arranged on the same side, and then the corresponding connection assemblies 22 are connected by the riveting block 7.

[0046] Refer to again Figure 1 and Figure 7 , in the embodiment of the present application, a plurality of explosion-proof holes 31 corresponding to the cavities 11 one by one are provided on the top cover 3; an explosion-proof component 32 is provided in the explosion-proof hole 31; the explosion-proof component 32 includes a plug 321, an explosion-proof sheet 322 and a second sealing ring 323 arranged from top to bottom.

[0047] In the embodiment of the present application, the plug 321 is in interference fit with the explosion-proof hole 31; anti-slip lines 3211 are provided on the outer surface of the plug. The anti-slip lines 3211 are used to increase the friction force. When the plug 321 is installed in the explosion-proof hole 31, the plug 321 relies on the friction force with the explosion-proof hole 31 to prevent retraction and falling, realizing the sealing and explosion-proof of the battery. In some other embodiments, internal threads are provided in the explosion-proof hole 31; external threads adapted to the internal threads are provided on the outer surface of the plug 321. Through the cooperation between the internal threads and the external threads, the plug 321 can be stably installed in the explosion-proof hole 31.

[0048] The plug 321 is a metal plug or a plastic plug; the explosion-proof sheet 322 is an aluminum alloy explosion-proof sheet, so that the explosion-proof pressure value of the explosion-proof component 32 is stable and reliable.

[0049] In the embodiment of the present application, the explosion-proof hole 31 can also be used as a liquid injection hole. In actual operation, the electrolyte can be first injected into the battery through the explosion-proof hole 31, and then the explosion-proof component 32 can be installed in the explosion-proof hole.

[0050] In the embodiment of the present application, a BMS module (not marked in the figure) and a balancing module (not marked in the figure) are provided on the integrated circuit board 6; the input end of the balancing module is electrically connected to the current-carrying terminal 71, and the output end of the balancing module is electrically connected to the BMS module. The balancing module can accurately detect and collect the voltage, current and temperature of each single cell 21 through the current-carrying terminal 71, and send the collected information to the BMS module. During the charging and discharging process of the battery, the BMS module can timely cut off the overcharge and over-discharge current, thereby playing a role in protecting the battery cells.

[0051] In the embodiment of the present application, the housing 1 is fixedly abutted against the top cover 3 by hot melting. By means of hot melting, the housing 1 and the top cover 3 are welded and sealed, which has the advantages of long service life, good sealing performance, corrosion resistance, etc., thereby improving the reliability and durability of the connection between the two.

[0052] Refer again to Figure 1 , in the embodiment of the present application, a positive terminal 8 and a negative terminal 9 are further provided at the same end of the top cover 3; one end of the positive terminal 8 is connected to the positive electrode of the battery cell group 2, and the other end extends outwards through the top cover 3; one end of the negative terminal 9 is connected to the negative electrode of the battery cell group 2, and the other end extends outwards through the top cover 3. The positive terminal 8 and the negative terminal 9 serve as the output terminals of the battery and are connected to the outside.

[0053] In the embodiment of the present application, each of the two outermost single cells 21 of the battery cell group 2 has a tab as the electrode of the battery cell group 2. At the same time, one end of the riveting block 7 connected to the tab is connected to the corresponding connection assembly 22, and the other end is connected to the positive terminal 8 / negative terminal 9, thereby forming the positive and negative electrodes of the battery. In addition, considering the space utilization rate inside the battery and also to ensure the stability of the connection, the riveting block 7 connected to the positive terminal 8 / negative terminal 9 is designed to be bent.

[0054] 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. Plastic is an insulator, which can effectively avoid the danger of short circuit or leakage between single cells. Moreover, plastic is relatively durable and low in cost, thus improving the service life of the battery and saving the production cost of the battery.

[0055] A lithium-ion battery with a multi-chamber structure proposed by an embodiment of the present invention can form a battery pack without additional PACK assembly by providing a plurality of chambers 11 adapted to the monomer cells 21 on the housing 1, saving the cost of PACK assembly. By injection molding the housing 1, the top cover 3, the first side plate 4, and the second side plate 5 with plastic, the occurrence of short circuits between the monomer cells 21 is effectively avoided, and the safety performance of the battery is improved. The structure of the present invention is simple, small in volume, large in capacity, light in weight, high in energy density, and low in cost.

[0056] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A lithium-ion battery with a multi-cavity structure, characterized in that, It includes a housing, a battery cell group, a top cover, a first side plate, a second side plate and an integrated circuit board; the battery cell group includes a plurality of single battery cells connected in series through riveting blocks; a plurality of cavities adapted to the single battery cells are arranged side by side on the housing; the top cover covers the battery cell group and is arranged on the top of the housing; the first side plate and the second side plate are respectively arranged on opposite sides of the housing; the integrated circuit board is arranged between the housing and the second side plate; a drainage terminal is further arranged between the riveting block and the outer side wall of the housing; the drainage terminal is electrically connected to the integrated circuit board; A connection component is arranged on the tab of the single battery cell; the connection component includes a connecting piece, a rivet and a first sealing ring; one end of the connecting piece is connected to the tab of the single battery cell, and the other end is connected to the rivet; the end of the rivet away from the connecting piece sequentially passes through the first sealing ring and the housing and then is connected to the riveting block; The connecting piece includes a first connecting portion and a second connecting portion connected to the first connecting portion; one end of the first connecting portion away from the second connecting portion is connected to the rivet; one end of the second connecting portion away from the first connecting portion is connected to the tab of the single battery cell; A folding structure is arranged at one end of the first connecting portion close to the second connecting portion; The second connecting portion includes a first pole piece and a second pole piece arranged in parallel; one end of the first pole piece is connected to the first connecting portion, and the other end is connected to the tab of the single battery cell; one end of the second pole piece is connected to the first connecting portion, and the other end is connected to the tab of the single battery cell.

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

3. The lithium-ion battery with a multi-chamber structure according to claim 2, characterized in that, The plug is in interference fit with the explosion-proof hole; anti-slip lines are arranged on the outer surface of the plug; Or, internal threads are arranged in the explosion-proof hole; external threads adapted to the internal threads are arranged on the outer surface of the plug.

4. The lithium-ion battery with a multi-cavity structure according to claim 2, wherein The plug is a metal plug or a plastic plug; the explosion-proof sheet is an aluminum alloy explosion-proof sheet.

5. The lithium ion battery with a multi-chamber structure according to claim 1, wherein, A BMS module and a balancing module are arranged on the integrated circuit board; the input end of the balancing module is electrically connected to the drainage terminal, and the output end of the balancing module is electrically connected to the BMS module.

6. The lithium-ion battery with a multi-cavity structure according to claim 1, characterized in that, 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 to the positive electrode of the battery cell group, and the other end extends outwards through the top cover; one end of the negative terminal is connected to the negative electrode of the battery cell group, and the other end extends outwards through the top cover.

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