CN115064828B - Battery cell connecting piece and battery module - Google Patents
Battery cell connecting piece and battery module Download PDFInfo
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- CN115064828B CN115064828B CN202210586148.2A CN202210586148A CN115064828B CN 115064828 B CN115064828 B CN 115064828B CN 202210586148 A CN202210586148 A CN 202210586148A CN 115064828 B CN115064828 B CN 115064828B
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 210000004460 N cell Anatomy 0.000 description 1
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
- H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
- H01M50/51—Connection only in series
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The disclosure provides a battery cell connecting piece and a battery module, which belong to the technical field of batteries, wherein the battery cell connecting piece comprises a first connecting part, a second connecting part and a bridging part connected between the first connecting part and the second connecting part; the cell connector comprises a plurality of sub-connectors which are connected in sequence; any sub-connector comprises a first sub-connector, a second sub-connector and a sub-bridge connected between the first sub-connector and the second sub-connector; the first sub-connecting parts of the sub-connecting pieces are sequentially connected to form a first connecting part; the second sub-connecting parts of the sub-connecting pieces are sequentially connected to form a second connecting part; the sub bridging parts of the sub connectors are sequentially connected to form a bridging part. According to the embodiment of the disclosure, the normal operation of the battery system is ensured, meanwhile, the overcurrent area is increased, and the battery is convenient to manage and maintain in a modularized manner due to mechanical connection, so that the production process is simpler and more convenient, and the industrialization efficiency is improved.
Description
Technical Field
The disclosure belongs to the technical field of batteries, and particularly relates to a battery core connecting piece and a battery module.
Background
With the vigorous development of new energy industry, the requirements of people on battery systems are getting higher and higher. While high energy density and high safety requirements are being made on batteries, it is also desirable to be able to perform timely maintenance treatment on the portions of the battery module where problems occur. The battery module is formed by connecting a plurality of battery cells in series or in parallel, the battery cells are connected in series and in parallel through battery cell connecting pieces, and most of the current battery cell connecting pieces are simple metal sheets and are welded between two battery cell polar posts through the metal sheets. However, the manner of welding and connecting the two battery cells by using the metal sheets is not stable, the phenomenon of off-welding is easy to occur, the maintenance cost is high, in addition, the other battery cells can be damaged in the maintenance process, even the maintenance of a single battery cell can not be performed, only the whole battery module can be replaced, and the cost of the battery cell material is increased.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art and provides a battery cell connecting piece and a battery module.
In a first aspect, embodiments of the present disclosure provide a battery cell connector including a first connection portion, a second connection portion, and a bridge portion connected between the first connection portion and the second connection portion;
the battery cell connecting piece comprises a plurality of sub-connecting pieces which are connected in sequence; any one of the sub-connectors comprises a first sub-connector, a second sub-connector, and a sub-bridge connected between the first sub-connector and the second sub-connector; wherein,,
the first sub-connecting parts of the sub-connecting pieces are sequentially connected to form the first connecting part; the second sub-connection parts of the sub-connection parts are sequentially connected to form the second connection part; the sub bridging parts of the sub connectors are sequentially connected to form the bridging parts.
In some examples, the plurality of sub-connectors are stacked in sequence; wherein,,
the first sub-connection parts of the sub-connection parts are sequentially stacked to form the first connection part; the second sub-connection parts of the sub-connection parts are sequentially stacked to form the second connection part; the sub-bridging portions of the sub-connectors are stacked in sequence to form the bridging portions.
In some examples, each of the sub-connectors is connected as a unitary structure.
In some examples, the first sub-connection, the second sub-connection, and the sub-bridge are an integrally formed structure.
In some examples, the first and second sub-connections are each circular arc or elliptical arc in shape.
In a second aspect, an embodiment of the present disclosure further provides a battery module, which includes the above-mentioned cell connector.
In some examples, the battery module further comprises a plurality of battery cells, wherein the first connection part and the second connection part of the battery cell connector are respectively in interference fit with two battery cell poles.
In some examples, the battery cell post has a connection hole, and the battery module further includes a first fixing member that can be inserted into the connection hole of the battery cell post, so that the first connection portion and the second connection portion are interference-fitted with the corresponding battery cell post.
In some examples, the first fixture includes an expansion screw and an expansion screw that is compatible with the expansion screw.
In some examples, the device further comprises a bottom plate and side plates connected with the bottom plate and arranged oppositely; the side plates are provided with a first fixing groove and a second fixing groove; the first fixing groove is matched with the first connecting part and used for fixing the first connecting part; the second fixing groove is matched with the second connecting part and used for fixing the second connecting part.
In some examples, a limiting step is disposed in each of the first and second fixing grooves for limiting the position of the first fixing member.
In some examples, an end plate and a pressure plate are also included; the end plate is connected with the first end of the side plate and the bottom plate; the pressing plate is arranged opposite to the end plate and detachably connected with the side plate.
Drawings
Fig. 1 is a schematic diagram of a cell connector provided in an embodiment of the disclosure;
fig. 2a is a front view of a cell connector provided by an embodiment of the present disclosure;
FIG. 2b is a cross-sectional view taken along line A-A' of FIG. 2 a;
FIG. 2c is a partial view of section I of FIG. 2 b;
FIG. 2d is a schematic diagram of a sub-connector provided by an embodiment of the present disclosure;
fig. 3a is a schematic diagram of a cell provided in an embodiment of the present disclosure;
fig. 3b is a schematic view of a battery post according to an embodiment of the disclosure;
fig. 4 is a top view of a cell post provided by an embodiment of the present disclosure;
FIG. 5a is a schematic diagram of an expansion coil provided in an embodiment of the present disclosure;
FIG. 5b is a top view of an expansion coil provided in an embodiment of the present disclosure;
FIG. 6a is a schematic view of an expansion screw provided in an embodiment of the present disclosure;
FIG. 6b is a partial view of section II of FIG. 6 a;
FIG. 7 is a schematic diagram of electrical connection details provided by embodiments of the present disclosure;
FIG. 8a is a schematic side panel provided by an embodiment of the present disclosure;
FIG. 8b is a partial view of section III of FIG. 8 a;
FIG. 8c is a partial view of section IV of FIG. 8 a;
fig. 9a is a schematic diagram illustrating installation of a cell connector according to an embodiment of the present disclosure;
figure 9b is a partial view of section v of figure 9 a;
fig. 10a is a schematic view illustrating installation of a battery module according to an embodiment of the present disclosure;
FIG. 10b is a partial view of the VI part of FIG. 10 a;
fig. 11 is a schematic diagram of a battery cell post according to an embodiment of the disclosure.
Wherein the reference numerals are as follows: a cell 100; a cell post 101; a cell post slot 102; a cell connector 200; expansion coil 300; expansion screw 400; a side plate 500; a limit step 501; an electrical connector securing slot 502; an end plate-base plate integrated piece 600; a platen 700.
Detailed Description
The present invention will be described in further detail below with reference to the drawings and detailed description for the purpose of better understanding of the technical solution of the present invention to those skilled in the art.
Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
The battery module comprises a battery core connecting piece and a plurality of battery cores arranged in the battery module; each cell includes a stack of cells (positive/negative cell posts). The plurality of battery cells in the battery module can be connected in series or in parallel. For convenience of description and understanding, the battery module is described by taking the example that the battery module comprises N electric cores, wherein N is more than or equal to 2. The 1 st electric core in N electric cores is arranged in sequence along a first direction, and the N electric cores are connected in series through electric core connectors. Specifically, the negative electrode core electrode post of the ith electric core is electrically connected with the positive electrode core electrode post of the (i+1) th electric core through an electric core connecting piece, wherein i is less than or equal to N-1.
The inventors have found that the electrical connection between the cell terminal and the cell connector is typically achieved by means of soldering. Therefore, if a certain cell in the battery module has a problem, the cell connecting piece welded with the cell pole column needs to be treated, the maintenance cost is high, other cells are easily damaged in the treatment process, even a single cell cannot be maintained, and the whole cell group can be replaced. Such a maintenance approach is time-consuming and labor-consuming, and also increases the cost of the material.
In view of this, there are provided a battery cell connector and a battery module including the same in embodiments of the present disclosure.
In a first aspect, fig. 1 is a schematic diagram of a battery cell connector according to an embodiment of the disclosure; fig. 2a is a front view of a cell connector provided by an embodiment of the present disclosure; FIG. 2b is a cross-sectional view taken along line A-A' of FIG. 2 a; FIG. 2c is a partial view of section I of FIG. 2 b; fig. 2d is a schematic diagram of a sub-connector provided in an embodiment of the disclosure, as shown in fig. 1, 2a, 2b, 2c, and 2d, the cell connector 200 includes a first connecting portion 21, a second connecting portion 22, and a bridging portion 23 connected between the first connecting portion 21 and the second connecting portion 22. The first connection portion 21 and the second connection portion 22 are respectively fixed to and electrically connected with the two battery cell posts 101, so as to realize electrical connection of the two battery cell posts 101.
In the disclosed embodiment, the cell connector 200 includes sub-connectors 201 connected in sequence; any one of the sub-connectors 201 includes a first sub-connection portion 211, a second sub-connection portion 221, and a sub-bridge portion 231 connected between the first sub-connection portion 211 and the second sub-connection portion 221; wherein, the first sub-connection portions 211 of the sub-connectors 201 are sequentially connected to form a first connection portion 21; the second sub-connection parts 221 of the sub-connectors 201 are sequentially connected to form a second connection part 22; the sub-bridge portions 231 of the respective sub-connectors 201 are sequentially connected to form the bridge portion 23, and in this way, a plurality of sequentially connected sub-connector portions 201 are formed to form the cell connector 200.
It should be noted that the number of the sub-connectors 201 in the cell connector 200 according to the embodiment of the disclosure may be increased correspondingly according to the overcurrent area. In addition, the shapes of the first and second sub-connection portions 211 and 221 in the sub-connection 201 are adapted to the shape of the cell terminal 101, for example: when the shape of the battery terminal 101 is cylindrical, the shapes of the first and second sub-connection parts 211 and 221 are circular arcs.
In some examples, the plurality of sub-connectors 201 of the cell connector 200 are stacked in sequence, and the connection of the plurality of sub-connectors 201 is achieved. Wherein the first sub-connection portions 211 of the sub-connectors 201 are stacked in sequence to form a first connection portion 21; the second sub-connection parts 221 of the sub-connectors 201 are sequentially stacked to form the second connection part 22; the sub-bridging portions 231 of the respective sub-connectors 201 are sequentially stacked to form the bridging portion 23, and in this way, a plurality of stacked sub-connectors 201 are formed to form the cell connector 200.
It should be noted that, the cell connector 200 of the embodiment of the disclosure may not be formed by stacking a plurality of sub-connectors 201 in sequence, that is, the embodiment of the disclosure does not limit the forming manner of the cell connector 200; similarly, the first sub-connection portions 211 of the sub-connectors 201 may not be stacked in order to form the first connection portion 21; the second sub-connection portions 221 of the sub-connectors 201 may not be stacked in order to form the second connection portion 22; the sub-bridge portions 231 of the respective sub-connectors 201 may not be stacked one on another to form the bridge portion 23. For convenience of presentation, the following description of embodiments of the present disclosure will be presented in terms of a stack formation.
In some examples, each sub-connector 201 in the cell connector 200 is connected as a unitary structure with a groove formed between adjacent sub-connectors 201. The structure is similar to a staple structure, and the cell connector 200 may be formed by stamping. The cell connector 200 formed in this way can ensure a good electrical connection between the sub-connectors 201. It should be understood that the formation of the cell connector 200 is not limited to the formation by stamping, and any manner may be used as long as the cell connector 200 electrically connected by the plurality of sub-connectors 201 can be formed.
In some examples, the first sub-connection 211, the second sub-connection 221, and the sub-bridge 231 are an integrally formed structure. The manufacturing process of the formed battery cell connector 200 is simpler, and the manufacturing cost is reduced.
In some examples, the first and second sub-connection portions 211 and 221 are each circular arc or elliptical arc in shape. As shown in fig. 1, 2a, 2b, 2c, and 2d, the first and second sub-connection portions 211 and 221 are each circular arc-shaped. When the electric core connecting piece 200 is electrically connected with the electric core pole 101, the minimum line contact area of the electric core connecting piece 200 and the electric core pole 101 is ensured, and in the follow-up compression process, acting forces among the electric core connecting piece 200 and the electric core pole 101 form micro deformation, so that the overcurrent contact area is increased, and the battery is beneficial to realizing quick charge.
It should be noted here that the shapes of the first sub-connection portion 211 and the second sub-connection portion 221 in the embodiment of the present disclosure depend on the shape of the cell terminal 101 to be connected thereto. For example: when the shape of the cell terminal 101 is cylindrical, the first sub-connection portion 211 and the second sub-connection portion 221 are both circular arcs; when the shape of the cell terminal 101 is trapezoidal, the second sub-connection portion 211 and the second sub-connection portion 221 are both trapezoidal.
In some examples, the material of each sub-connector 201 is a pliable flexible material, such as: the material of the sub-connector 201 may be a metal material such as copper or aluminum, and of course, the sub-connector 201 may be an alloy material, which is not described herein. The reason why the flexible material of the sub-connector 201 is selected to be bendable is that when the first connection portion 21 and the second connection portion 22 are respectively fixed with the cell terminal 101, the cell terminal 101 and the connection portion can be contacted under the action of external force, so as to realize close fitting and even generate micro deformation, thereby ensuring that the overcurrent requirement is met; while facilitating insertion of the cell connector 200 into the cell connector securing slot 502 for securing.
In a second aspect, the disclosed embodiments also provide a battery module including any of the above-described embodiments of the cell connector 200 and the plurality of cells 100; each cell 100 has a cell post 101, and one cell connector 200 electrically connects the cell posts 101 of two adjacent cells 100, thereby achieving series or parallel connection between the cells 100.
For clarity of the structure of the battery module in the embodiment of the present disclosure, the battery cells 100 in the battery module are connected in series by the cell connector 200. Fig. 10a is a schematic view illustrating installation of a battery module according to an embodiment of the present disclosure; fig. 10b is a partial view of the vi portion of fig. 10a, and as shown in fig. 10a and 10b, the battery module includes N cells 100, n.gtoreq.2. The first to nth battery cells 100, 100 are arranged side by side along a first direction, the positive electrode core pole 101 of the first battery cell 100 is connected with the first conductive structure, and the negative electrode core pole 101 of the nth battery cell 100 is connected with the second conductive structure; the first connection portion 21 of one cell connector 200 is electrically connected to the negative electrode cell post 101 of the i-th cell 100, and the second connection portion 22 is electrically connected to the positive electrode cell post 101 of the i+1th cell 100, thereby forming a serial path between the cells 100. Wherein i is 1 to N-1, and i is a positive integer.
It can be understood that the negative electrode cell post 101 of the first cell 100 is connected to a first conductive structure, the positive electrode cell post 101 of the nth cell 100 is connected to a second conductive structure, and the first conductive structure and the second conductive structure may be the same as the first connection portion 21/the second connection portion 22.
In some examples, the battery module of the embodiments of the present disclosure includes not only the above-described battery cell 100 and the battery cell connector 200, but also a bottom plate and two side plates 500 disposed opposite to each other and connected to the bottom plate. The side plate 500 is provided with a fixing groove, the cell connector 200 may be pre-installed in the fixing groove of the side plate 500 in the battery module, and after the cell 100 is inserted into the accommodating space of the battery module, the cell pole 101 is electrically connected with the cell connector 200, thereby realizing serial connection or parallel connection between the cells 100. When the battery module provided by the embodiment of the disclosure has a problem, the battery core 100 can be directly taken out from the accommodating space of the battery module for maintenance or replacement, and compared with the electric connection mode that the metal sheet is welded between the two battery core polar posts 101, the battery module provided by the embodiment of the disclosure greatly reduces maintenance efficiency and saves cost. It should be noted that, since the side plate 500 is generally made of conductive material, the short circuit phenomenon of the cell connector 200 is easy to occur, and therefore, an insulating layer is disposed in the fixing groove of the side plate 500, so that the cell connector 200 installed in the fixing groove of the side plate 500 is insulated from the side plate 500, thereby ensuring that the short circuit phenomenon of each cell connector 200 does not occur.
Specifically, the side plate 500 is provided with a first fixing groove and a second fixing groove; the first fixing groove is adapted to the first connecting portion 21 for fixing the first connecting portion 21; the second fixing groove is adapted to the second connecting portion 22 for fixing the second connecting portion 22. FIG. 8a is a schematic side panel provided by an embodiment of the present disclosure; FIG. 8b is a partial view of section III of FIG. 8 a; fig. 8c is a partial view of the iv portion of fig. 8a, and as shown in fig. 8a, 8b, and 8c, the first fixing groove and the second fixing groove form a fixing groove 502 of the cell connector and are disposed on the side plate 500. Fig. 9a is a schematic diagram illustrating installation of a cell connector according to an embodiment of the present disclosure; fig. 9b is a partial view of the v portion of fig. 9a, and as shown in fig. 9a and 9b, the cell connector 200 is fixed to the side plate 500 by the cell connector fixing groove 502 formed by the first fixing groove and the second fixing groove.
In some examples, a limiting step 501 is disposed in each of the first and second securing slots for defining the position of the first securing member. As shown in fig. 8a, 8b and 8c, a limiting step 501 is disposed in the cell connector fixing groove 502 to define the position of the first fixing member.
In some examples, the battery module further includes an end plate and a pressure plate 700; the end plate is connected with the first end of the side plate 500 and the bottom plate; the pressing plate 700 is disposed opposite to the end plate, is detachably connected to the side plate 500, and can be used for fixing the battery cell 100. Fig. 10a is a schematic view illustrating installation of a battery module according to an embodiment of the present disclosure; fig. 10b is a partial view of the vi portion of fig. 10a, and as shown in fig. 10a and 10b, the battery module includes at least two battery cells 100, an end plate, a bottom plate, a side plate 500, a pressing plate 700, an expansion screw 300, and an expansion screw 400. For convenience of illustration, the end plate and the bottom plate are denoted by an end plate and bottom plate integrated piece 600. The cell connector 200 is pre-installed and fixed in the cell connector fixing groove 502 of the side plate 500; the side plates 500, the end plates and the bottom plate are pre-installed to form a mouth-shaped space shell; the electric core 100 is sequentially inserted into the space shell; the pressing plate 700 is pushed towards the direction of the end plate, so that the large surface of the battery cell 100 is pressed; sequentially inserting expansion spiral pipes 300 into the battery cell pole slots 102, wherein the expansion spiral pipes 300 are limited by limit steps 501 in the side plates 500 and fixed in the battery cell pole slots 102; the expansion screw 400 is inserted in sequence, so that the expansion screw 300 is forced to expand, the cell pole 101 is pressed outwards, and the cell pole contacts with the cell connector 200, and finally an electrical connection path is formed. The pushing manner of the pressing plate 700 toward the end plate is not limited, as long as the large surface of the battery cell 100 can be pressed.
It should be noted that, in the embodiment of the present disclosure, the strength of the material selected for the side plate 500 can resist the expansion force of the cell connector 200 after the cell connector 200 is pressed by the deformation generated when the expansion screw 400 is inserted into the cell terminal 101.
In some examples, the first and second connection portions 21 and 22 of the cell connector 200 are respectively interference fit with the two cell posts 101. By means of an interference fit, the cell terminal 101 and the cell connector 200 can be brought into surface contact, thereby forming a current path.
It should be noted that, although the connection between the battery core pole 101 and the first connection portion 21/the second connection portion 22 is achieved through interference fit, by this connection mode, because an interaction force is generated between the battery core pole 101 and the first connection portion 21/the second connection portion 22, that is, mutual extrusion is generated between the two, a minimum line contact area between the battery core connecting piece 200 and the battery core pole 101 is ensured, and in a subsequent compression process, a micro deformation is formed due to the interaction force between the two, so that an overcurrent contact area is increased, and quick charging of the battery is facilitated.
Fig. 7 is a schematic view of electrical connection details provided in the embodiment of the present disclosure, as shown in fig. 7, the electrical connection process includes three steps, wherein the first step is that the battery cell 101 is in contact with the battery cell connector 200 but is not electrically connected, the second step is that the expansion screw 300 is sequentially inserted into the battery cell post slot 102, the third step is that the expansion screw 400 is sequentially inserted into the expansion screw 300, so that the expansion screw 300 is forced to expand, and the battery cell post 101 is pressed outwards and is in contact with the battery cell connector 200, and finally an electrical connection path is formed. Before the expansion screw 400 is inserted, the cell terminal 101 is not in contact with the cell connector 200; after insertion of the expansion screw 400, the cell terminal 101 is forced to deform outwardly and contact the cell connector 200 to form a passageway.
In some examples, the cell terminal 101 has a connection hole, which may be open-loop or closed-loop, preferably open-loop; the battery module further includes a first fixing member through which interference fit of the battery cell post 101 and the battery cell connector 200 can be achieved. Specifically, the first fixing piece can be inserted into the open loop connection hole of the battery cell terminal 101, so that the first connection portion 21 and the second connection portion 22 are in interference fit with the corresponding battery cell terminal 101 of the battery cell 100. The cell terminal 101 and the cell connector 200 are in contact with each other by means of an interference fit to form a current path. Fig. 3a is a schematic diagram of a cell provided in an embodiment of the present disclosure; fig. 3b is a schematic view of a battery post according to an embodiment of the disclosure; fig. 4 is a top view of a battery cell pole provided in an embodiment of the disclosure, as shown in fig. 3a, 3b and 4, a battery cell pole 101 is disposed on a battery cell 100, and has an open loop connection hole, an opening of the open loop connection hole of the battery cell pole 101 faces away from the battery cell 100, and a first fixing piece can be inserted into the open loop connection hole of the battery cell pole 101, so that the first connection portion 21 and the second connection portion 22 are in interference fit with the corresponding battery cell pole 101. The open-loop structure can be in interference fit, tiny deformation occurs, surface contact of the battery cell pole 101 and the battery cell connecting piece 200 is easy to achieve, and the battery cell pole 101 and the battery cell connecting piece 200 are in contact to form a current path in an interference fit mode.
It should be noted that, in the embodiment of the present disclosure, the specific form, structure and composition of the first fixing member are not limited, so long as the first fixing member can be inserted into the open loop connection hole of the battery cell terminal 101, so that the first connection portion 21 and the second connection portion 22 can be in interference fit with the corresponding battery cell terminal 101 of the battery cell 100, and the battery cell terminal 101 and the battery cell connection member 200 can be in contact to form a current path in an interference fit manner.
In some examples, the first fixture includes an expansion screw 300 and an expansion screw 400 that is compatible with the expansion screw 300. FIG. 5a is a schematic diagram of an expansion coil provided in an embodiment of the present disclosure; fig. 5b is a top view of an expansion coil provided in an embodiment of the present disclosure, and as shown in fig. 5a and 5b, the expansion coil 300 is a hollow cylinder. FIG. 6a is a schematic view of an expansion screw provided in an embodiment of the present disclosure; fig. 6b is a partial view of section ii of fig. 6a, and as shown in fig. 6a and 6b, the expansion screw 400 includes a first cylinder and a second cylinder, the first cylinder and the second cylinder are connected, and the second cylinder has threads on the surface. The expansion screw 400 is inserted into the expansion screw 300, so that the expansion screw 300 expands, and the cell terminal 101 is deformed outwards by force, so that a current path is formed by contact with the cell connector 200. In one example, the expansion screw 300 may use a sidewall opening type, for example, the opening penetrates through the sidewall in the axial direction of the expansion screw 300, and in this type of expansion screw 300, the expansion screw 300 is conveniently expanded outward when the expansion screw 400 is inserted into the expansion screw 300, so that the cell connector 200 holds the cell terminal 101 tightly.
In some examples, the open loop connection hole of the cell terminal 101 opens toward the cell 100 or away from the cell 100. Fig. 11 is a schematic diagram of a battery cell post according to an embodiment of the disclosure. As shown in fig. 4 and 11, the open-loop connection hole of the battery terminal 101 in fig. 4 is open to the battery 100, and the open-loop connection hole of the battery terminal 101 in fig. 11 is open to the battery 100. The cell pole 101 is configured to be connected with the cell connector 200, so that series connection or parallel connection between the cells 100 is realized, and no matter where the opening of the cell pole 101 is, the cell pole 101 can be adapted to the cell connector 200 and the overcurrent area between the two can be ensured.
It should be noted that, in the embodiment of the present disclosure, the connection hole of the battery cell terminal 101 may be not an open loop connection hole, that is, there is no opening, so long as the first fixing member can be inserted into the connection hole of the battery cell terminal 101, so that the first connection portion 21 and the second connection portion 22 can be in interference fit with the corresponding battery cell terminal 101 of the battery cell 100, and the battery cell terminal 101 and the battery cell connecting member 200 contact to form a current path in an interference fit manner.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (9)
1. The battery module is characterized by comprising a battery cell connecting piece and a plurality of battery cells;
the battery cell connecting piece comprises a first connecting part, a second connecting part and a bridging part connected between the first connecting part and the second connecting part; wherein,,
the battery cell connecting piece comprises a plurality of sub-connecting pieces which are connected in sequence; any one of the sub-connectors comprises a first sub-connector, a second sub-connector, and a sub-bridge connected between the first sub-connector and the second sub-connector; wherein,,
the first sub-connecting parts of the sub-connecting pieces are sequentially connected to form the first connecting part; the second sub-connection parts of the sub-connection parts are sequentially connected to form the second connection part; the sub bridging parts of the sub connectors are sequentially connected to form the bridging parts;
the first connecting part and the second connecting part of the electric core connecting piece are respectively in interference fit with the poles of two different electric cores;
the battery cell pole is provided with a connecting hole, the battery module further comprises a first fixing piece, and the first fixing piece can be inserted into the connecting hole of the battery cell pole, so that the first connecting portion and the second connecting portion are in interference fit with the corresponding battery cell pole.
2. The battery module according to claim 1, wherein a plurality of the sub-connectors are stacked in order; wherein,,
the first sub-connection parts of the sub-connection parts are sequentially stacked to form the first connection part; the second sub-connection parts of the sub-connection parts are sequentially stacked to form the second connection part; the sub-bridging portions of the sub-connectors are stacked in sequence to form the bridging portions.
3. The battery module according to claim 1, wherein each of the sub-connectors is connected in a unitary structure.
4. The battery module of claim 1, wherein the first sub-connection part, the second sub-connection part, and the sub-bridge part are an integrally molded structure.
5. The battery module according to claim 1, wherein the first and second sub-connection parts are each in the shape of an arc or an elliptical arc.
6. The battery module of claim 1, wherein the first fixing member comprises an expansion screw and an expansion screw adapted to the expansion screw.
7. The battery module according to claim 1, further comprising a bottom plate, and side plates connected to the bottom plate and disposed opposite to each other; the side plates are provided with a first fixing groove and a second fixing groove; the first fixing groove is matched with the first connecting part and used for fixing the first connecting part; the second fixing groove is matched with the second connecting part and used for fixing the second connecting part.
8. The battery module according to claim 7, wherein a limiting step is provided in each of the first and second fixing grooves for limiting the position of the first fixing member.
9. The battery module of claim 7, further comprising an end plate and a pressure plate; the end plate is connected with the first end of the side plate and the bottom plate; the pressing plate is arranged opposite to the end plate and detachably connected with the side plate.
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| CN202210586148.2A CN115064828B (en) | 2022-05-27 | 2022-05-27 | Battery cell connecting piece and battery module |
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| CN115064828B true CN115064828B (en) | 2023-07-07 |
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| CN201112604Y (en) * | 2007-05-15 | 2008-09-10 | 顺连电子股份有限公司 | Lock joint type stack connector |
| CN211238368U (en) * | 2019-11-29 | 2020-08-11 | 湖北亿纬动力有限公司 | Electricity core connecting piece and battery module |
| WO2021253357A1 (en) * | 2020-06-18 | 2021-12-23 | 东莞新能安科技有限公司 | Battery module and battery pack |
| CN214505977U (en) * | 2021-02-05 | 2021-10-26 | 富加宜连接器（东莞）有限公司 | Stack type connector |
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| CN215451610U (en) * | 2021-05-28 | 2022-01-07 | 远景动力技术(江苏)有限公司 | Battery module and battery pack |
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