CN216980830U - Built-in water conservancy diversion connecting device of battery electricity core and lithium ion power battery - Google Patents
Built-in water conservancy diversion connecting device of battery electricity core and lithium ion power battery Download PDFInfo
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- CN216980830U CN216980830U CN202220540864.2U CN202220540864U CN216980830U CN 216980830 U CN216980830 U CN 216980830U CN 202220540864 U CN202220540864 U CN 202220540864U CN 216980830 U CN216980830 U CN 216980830U
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Abstract
The utility model provides a built-in flow guide connecting device of a battery cell and a lithium ion power battery. The device is including fusing portion on the inside utmost point post coupling assembling's of electric core body, when the short circuit takes place for battery electric core, this fusing portion of can fusing in the twinkling of an eye heavy current heat production on the built-in water conservancy diversion connecting device of battery electric core, realize providing short circuit protection function for electric core main part in inside, provide first inside defence line for guaranteeing battery electric core safety application, battery electric core easily takes place the explosion problem of catching fire when having avoided having the short circuit, the security of cylindrical power electric core has been improved, the holistic security of lithium ion power battery has also been improved.
Description
Technical Field
The application relates to the technical field of power batteries, in particular to a built-in flow guide connecting device of a battery cell and a lithium ion power battery.
Background
The lithium ion power battery is a novel high-energy battery successfully developed in the 20 th century. The negative electrode of such a battery is usually made of a material such as graphite, and the positive electrode is made of lithium iron phosphate, lithium cobaltate, lithium titanate, or the like.
Lithium ion power batteries generally have two shapes: cylindrical and rectangular. The cylindrical battery adopts a cylindrical power battery core, the interior of the cylindrical battery adopts a spiral winding structure, and the cylindrical battery is formed by spacing a very fine and strong-permeability polyethylene or polypropylene or a polyethylene and polypropylene compounded film isolation material between a positive electrode and a negative electrode.
The current lithium ion power battery adopting the cylindrical power battery core has the advantages that the flow guide lug of the flow collecting disc is convenient to weld with the top cover, the welding area is ensured, the phenomena of insufficient solder and solder leakage are reduced, the width design is wide, only the flow guide function is realized, and the short circuit protection effect is not realized. The battery core capacity of the cylindrical power battery core is higher, so that the problem of fire explosion easily occurs during short circuit.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present application provides a battery electric core embeds water conservancy diversion connecting device, is applied to cylindrical power electricity core, includes:
the terminal post connecting assembly comprises a winding body connecting part and a terminal post connecting assembly connected with the winding body connecting part;
the utmost point post coupling assembling include with the utmost point ear that the coiling body connecting portion are connected extends the main part, and locates utmost point ear extends the fusing portion in the main part.
Preferably, the tab extension main body is a strip-shaped tab extension main body extending in a direction away from the winding body connection portion.
Preferably, the fusing part is inwardly contracted and recessed from the outer side to form a narrowed region which is narrowed from a wide width with respect to the tab extension body.
Preferably, the narrowing region is a narrowing region provided with an inward concave narrowing gap.
Preferably, at least two narrowing regions arranged in pairs are provided in the fusing part.
Preferably, the narrowing regions arranged in pairs are arranged in mirror symmetry; wherein the content of the first and second substances,
the bottoms of the notches of the two corresponding narrowing regions are corresponding, and the opening directions of the notches are towards the direction far away from the middle part of the tab extending main body on the horizontal plane.
Preferably, the winding body connection part includes a connection main body;
the connecting body is provided with a central hole.
Preferably, the connecting main body is provided with a reinforcing rib;
electrolyte diversion holes are formed in the reinforcing ribs.
Preferably, the connecting body is matched with the section of a cylindrical winding body in the cylindrical power battery cell in size;
a plurality of strip-shaped reinforcing ribs are arranged on the surface of the connecting main body; the reinforcing rib extends from a region around the center hole to a direction away from the center hole in the connecting body.
In addition, in order to solve the above problems, the present invention further provides a lithium ion power battery, including a cylindrical power battery cell;
the cylindrical power battery cell comprises an upper cover, the battery cell built-in diversion connecting device and a cylindrical winding body, wherein the battery cell built-in diversion connecting device is connected with the upper cover, and the cylindrical winding body is connected with the battery cell built-in diversion connecting device.
The utility model provides a built-in flow guide connecting device of a battery cell and a lithium ion power battery. Wherein, built-in water conservancy diversion connecting device of battery electricity core is including fusing portion on the inside utmost point post coupling assembling's of electric core body, when the short circuit takes place for battery electricity core, this fusing portion of can fusing by the heavy current heat production in the twinkling of an eye on the built-in water conservancy diversion connecting device of battery electricity core, realize providing short circuit protection function for electric core main part in inside, for guaranteeing that battery electricity core safety is used and providing first inside defence line, battery electricity core easily takes place the explosion problem of catching fire when having avoided having the short circuit, cylindrical power electricity core's security has been improved, the holistic security of lithium ion power battery has also been improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram illustrating a battery cell built-in current-guiding connection device according to the present application;
fig. 2 is a schematic structural diagram illustrating a structure of a fuse including two symmetrically arranged narrowing region battery cell built-in current-guiding connection devices according to the present application;
fig. 3 shows an explosion diagram of a cylindrical power cell in the lithium ion power battery of the present application (the pole connecting assembly in the battery cell built-in current guiding connecting device is in an extended state);
fig. 4 shows an explosion diagram of a cylindrical power cell in the lithium ion power battery of the present application (the terminal connecting assembly in the battery cell built-in current guiding connecting device is in a folded state).
Description of reference numerals:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Built-in flow guide connecting device of |
120 | |
| 110 | Connection part of |
121 | Tab extension |
| 111 | Connecting |
122 | |
| 112 | |
1221 | Narrowing |
| 113 | Reinforcing |
200 | |
| 114 | |
300 | Cylindrical wound body |
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present application, are intended to indicate only specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of the present application belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments.
Referring to fig. 1, the present embodiment provides a battery cell built-in current-guiding connection apparatus 100, applied to a cylindrical power cell, including: the winding body connecting part 110 and the pole connecting assembly 120 are connected.
It should be noted that the lithium ion power battery is a novel high-energy battery. The negative electrode of this battery is made of graphite or the like, and the positive electrode is made of lithium iron phosphate, lithium cobaltate, lithium titanate or the like. The 70 s were put into practical use. Because of its advantages of high energy, high battery voltage, wide working temp. range and long storage life, it has been widely used in different electric appliances of various industries.
The power battery using lithium manganate, lithium iron phosphate and the like as the anode materials is classified as a lithium ion power battery, and has advantages, and is a development trend of a new generation of lithium ion power batteries.
The pole connecting assembly 120 is connected to the winding body connecting portion 110.
The winding body is a portion which is provided below the winding body connection portion 110 and serves as a main body of the battery cell, and the portion is formed by winding a sheet-like or strip-like material, has a generally cylindrical cross section, and constitutes a main body of the cylindrical power cell. The winding body connecting portion 110 is provided above the winding body. The shape of the coil is generally a sheet-like or plate-like structure, and the surface shape of the coil is generally matched with the cross-sectional shape of the lower wound body. For example, it may be circular.
The pole connecting portion has an electrode ear-like structure for connecting a pole, which is connected to the wound body connecting portion 110. The coil connecting portion 110 is formed to correspond to a portion extending outward.
During assembly, the winding body connecting part 110 is first connected to the winding body at the lower end, and the pole connecting assembly 120 is folded and connected to the top cap pole at the upper end.
The pole connecting assembly 120 includes a tab extension body 121 connected to the winding body connecting portion 110, and a fusing portion 122 provided on the tab extension body 121.
The fusing part 122 is provided in the tab extension body 121 and is a part of the pole connection assembly 120. The top cap pole, the pole connecting assembly 120, the winding body connecting part 110 and the like form a loop.
Fusing portion 122 can be when this return circuit is flowed through to the electric current, if the electric current is too big in the return circuit, causes this fusing portion 122 at first to fuse to can realize providing first way defence line from cylindrical electric core inside under the prerequisite of protecting inside electric core safety, avoiding burning out.
The existing lithium ion power battery also has structures with functions of overheat protection and short-circuit protection, but the structures are arranged outside a battery cell, and the purpose of short-circuit protection is achieved by using an external protection device. For example, in the conventional battery, an external fusing structure is independently arranged on a top cover of the battery, that is, a safety device is arranged on the top cover and arranged above a top cover plate; the pole column supplies power to an external load, current flows through the pole ear and the safety device to form a loop, the safety device is provided with a fusing structure, when the current on the loop is too large, the fusing structure is firstly fused, and the safety device is arranged on the top cover, so that the fusing structure is externally arranged.
This heavy power battery has set up an external safeties outside battery electric core's top cap, plays the circuit protection effect to when the electric current overloads in the return circuit, but does not consider the getting rid of risk at first for the inside circuit safety of battery electric core, if take place the short circuit in the return circuit, out of order or not take place the fusing at external safeties, battery electric core inside will directly take place overheated and then lead to catching fire and exploding.
The built-in water conservancy diversion connecting device 100 of battery electric core that provides in this application to need not extra outside battery electric core to set up solitary safety device, but directly be provided with fusing part 122 on the inside utmost point post coupling assembling 120 of electric core, thereby make the built-in water conservancy diversion connecting device 100 of battery electric core whole enough play certain effects such as connection, electric current conduction, can play the electric current guard action to the inside own of electric core again.
When the short circuit takes place at battery electric core, this fusing portion 122 can be fused to the heavy current heat production in the twinkling of an eye on the built-in water conservancy diversion connecting device 100 of battery electric core, realizes providing short circuit protection function for the electric core main part in inside, provides inside first inside defence line for guaranteeing battery electric core safety application, and the battery electric core easily takes place the explosion problem of catching a fire when having avoided having the short circuit, has improved the security of cylindrical power electric core, has also improved the holistic security of lithium ion power battery.
Further, the tab extension main body 121 is a strip-shaped tab extension main body 121 extending in a direction away from the winding body connection portion 110.
The tab extension bodies 121 are strip-shaped and extend outward from the winding body connecting portion 110. The extension can function as a fold and as a current conducting when mounted.
Further, the fusing part 122 is inwardly contracted from the outer side and recessed to form a narrow part 122a which is narrowed from the width of the tab extension body 121.
The fusing part 122 is narrowed from the lateral side to the inner side to form a shape which is inwardly contracted and recessed, so that the strip-shaped tab extension body 121 is formed to be narrowed from a wide side, and the narrowed region 122a of the fusing part 122 forms a narrowed part in the strip-shaped tab extension body 121.
Further, the narrowing region 122a is a narrowing region 122a provided with an inward concave narrowing gap.
The narrowed region 122a of the fusing part 122 may be a V-shaped narrowed region 122a, and may have a shape similar to a notch. Other notch shapes are also possible, such as U-shaped, concave, etc.
When tested by the national standard 38031 short-circuit standard, an external circuit is communicated with a 5m omega short-circuit resistor, and the short-circuit instantaneous current is as high as I ═ U/ROuter cover3.65/0.005-730A. Heat quantity Q ═ I of circuit in electric core2R, the internal resistance at the notch formed by the narrowed region 122a of the fusing portion 122 is defined as R1, the tab width at the notch is L1, the internal resistance at the notch position is not provided as R2, the tab width is L2, and R1/R2 is L2/L1 (ratio is 1-10), so that the heat generation amount at the notch is Q1/Q2 is L2/L1, and it is known that the heat generation amount at the notch is much higher than the normal position.
And the built-in water conservancy diversion connecting device 100 of battery electric core that provides in this embodiment is equipped with fusing portion 122, and this fusing portion 122 can be in the short circuit in the twinkling of an eye by the breach department very first time of fusing portion 122 take place fusing earlier inside the electric core, timely avoid the inside explosion out of control of taking place of electric core.
Further, at least two narrowing regions 122a are provided in the fusing part 122.
Referring to fig. 2, the narrowing regions 122a are arranged in pairs, that is, two corresponding V-shaped inward concave narrowing notches are formed by the two narrowing regions 122a of the fusing part 122, the two narrowing regions 122a may be symmetrically arranged or obliquely staggered, as long as the width of the segment is smaller than the width of the tab extending body 121, so as to form a narrowing form, and achieve a fusing function.
Further, the narrowing regions 122a arranged in pairs are arranged in mirror symmetry; wherein the content of the first and second substances,
the bottoms of the notches of the two corresponding narrowing regions 122a correspond to each other, and the opening directions of the notches are both in the direction away from the middle of the tab extending main body 121 on the horizontal plane.
As described above, the narrowed regions 122a of the fusing part 122 are arranged in mirror symmetry, the V-shaped notches of the two narrowed regions 122a are opposite in lateral tip, so that the narrowed region 122a at the middle portion is formed, and the two sides are in the shape of notches, so that the narrowest portion in the middle can be fused inside the battery cell first at the first time from the notch of the fusing part 122 at the moment of short circuit.
Further, the winding body connection part 110 includes a connection main body 111;
the connecting body 111 is provided with a central hole 112.
The connecting body 111 has a plate-like structure connected to the lower end winding body, and is basically adapted to the shape of the lower end cylindrical winding body 300, and is also circular. The center of the central hole 112 is provided with a central hole 112, which is used for connecting with the central hole 112 of the lower winding body and is used for guiding the electrolyte.
Further, a reinforcing rib 113 is arranged on the connecting main body 111;
the reinforcing rib 113 is provided with an electrolyte guiding hole 114.
In order to enhance the strength of the plate-shaped structure surface, the reinforcing rib 113 is disposed on the plate-shaped structure surface of the connecting body 111, and the reinforcing rib 113 is disposed with an electrolyte guiding hole 114, and the electrolyte guiding hole 114 is used for guiding the electrolyte (the guiding of the electrolyte guiding hole is specific to the guiding of the electrolyte, and is different from the guiding of the current).
Further, the size of the connecting body 111 matches the cross section of the cylindrical winding body 300 in the cylindrical power cell;
a plurality of strip-shaped reinforcing ribs 113 are arranged on the surface of the connecting main body 111; the reinforcing rib 113 extends from a region around the center hole 112 to a direction away from the center hole 112 in the connecting body 111.
The connecting body 111 may have a circular structure, and a plurality of ribs 113 may be provided on the surface thereof, and the ribs 113 may be formed as bar-shaped ribs 113.
The reinforcing ribs 113 extend from the center to the periphery of the circular connecting body 111 with the center hole 112 as the center, so that the strength of each part of the connecting body 111 can be improved on the premise of retaining the flow guiding effect of the center hole 112.
In addition, the embodiment also provides a lithium ion power battery, which comprises a cylindrical power battery cell;
the cylindrical power battery cell comprises an upper cover 200, the battery cell built-in diversion connection device 100 connected with the upper cover 200 and described above, and a cylindrical winding body 300 connected with the battery cell built-in diversion connection device 100.
Referring to fig. 3 and the exploded view of fig. 4, the upper cover 200, the battery cell internal current guiding connection device 100, and the cylindrical winding body 300 are sequentially connected when assembled.
The pole connecting assembly of the battery cell built-in diversion connection device 100 is folded and connected with the upper cover 200 at the upper end and matched with the pole; the winding body connection part 110 of the battery cell built-in current-guiding connection device 100 is connected to the cylindrical winding body 300 at the lower end.
The above-mentioned connection mode may be welding, and may also be other connection modes which do not affect the communication of the current loop.
In summary, the present invention provides a lithium ion power battery including a cylindrical power cell, wherein a battery cell built-in current-guiding connection device 100 having a circuit short-circuit protection function is disposed in the cylindrical power cell. Wherein, the device is including fusing part 122 on the inside utmost point post coupling assembling 120's of electric core body, when the short circuit takes place for battery electric core, this fusing part 122 of just fusing can be followed the inside very first time of electric core to the heavy current heat production in the twinkling of an eye on the built-in water conservancy diversion connecting device 100 of battery electric core, realize providing short circuit protection function for the electric core main part in inside, provide first inside defence line for guaranteeing battery electric core safety application, battery electric core easily takes place the explosion problem of catching fire when having avoided having the short circuit, the holistic security of lithium ion power battery who adopts cylindrical power electric core has been improved.
Safety comparison experiment
1. The experimental method comprises the following steps:
the cylindrical power electric core that sets up fusing part in the built-in water conservancy diversion connecting device of battery electric core that provides in the application sets up fusing part with the cylindrical power electric core that does not set up fusing part in the built-in water conservancy diversion connecting device of battery electric core, carries out the short circuit setting equally, and the state of two kinds of samples during the test short circuit carries out the comparison.
2. Experimental materials:
(1) sample a (control): the cylindrical power battery cell is not provided with the fusing part in the built-in flow guide connecting device of the battery cell;
(2) sample B (product provided herein): a cylindrical power battery cell of a fusing part is arranged in the built-in flow guide connecting device of the battery cell.
3. And (3) testing results:
(1) in the sample A, because the capacity of the battery cell is high, the battery cell continuously generates violent discharge reaction after short circuit under the condition of no short circuit protection design, thermal runaway is caused, and the condition of fire explosion is caused.
(2) Sample B, in the short circuit emergence moment, fusing portion utmost point ear fuses immediately, has avoided lasting violent discharge reaction, avoids causing the thermal runaway, only covers the opening after the test.
In conclusion, the following conclusions can be intuitively drawn through the results of the safety comparison experiment:
compare in the cylindrical power electricity core that does not set up fusing part in the built-in water conservancy diversion connecting device of battery electricity core, the product that provides in this application, the cylindrical power electricity core that sets up fusing part in the built-in water conservancy diversion connecting device of battery electricity core promptly can be after electric core short circuit, through the inside first line defence line of electric core: the fusing part arranged in the battery electric core built-in diversion connecting device is fused immediately at the first time when a short circuit occurs, violent discharge reaction does not occur as in a sample A, heating runaway and fire explosion are not caused, and therefore the product (the cylindrical power electric core provided with the fusing part in the battery electric core built-in diversion connecting device) provided by the application can be proved to be capable of effectively and directly improving the safety of the lithium ion power battery adopting the cylindrical power electric core from the inside of the electric core without additionally arranging other fusing structures outside the electric core.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application.
Claims (10)
1. The utility model provides a built-in water conservancy diversion connecting device of battery electricity core, is applied to cylindrical power electricity core, a serial communication port, includes:
the winding body connecting part is connected with the winding body connecting part;
the pole connection assembly comprises a pole lug extending main body connected with the winding body connecting part and a fusing part arranged on the pole lug extending main body.
2. The battery cell-embedded current-conducting connection device of claim 1,
the tab extension main body is a strip-shaped tab extension main body extending towards the direction far away from the winding body connecting part.
3. The battery cell built-in flow-guiding connection device of claim 2, wherein the fusing part is inwardly contracted and recessed from the outer side to form a narrowing region with a width that is gradually narrowed relative to the width of the tab extension main body.
4. The battery cell built-in current-guiding connection device of claim 3, wherein the narrowing region is a narrowing region provided with an inward concave narrowing gap.
5. The battery cell internal current-guiding connection device of claim 3 or 4, wherein at least two narrowing regions are provided in pairs in the fusing portion.
6. The battery cell internal flow guide connection device of claim 5, wherein the narrowing regions arranged in pairs are arranged in mirror symmetry; wherein, the first and the second end of the pipe are connected with each other,
the bottoms of the notches of the two corresponding narrowing regions are corresponding, and the opening directions of the notches are towards the direction far away from the middle part of the tab extending main body on the horizontal plane.
7. The battery cell internal flow-guiding connection device of claim 1, wherein the winding body connection portion comprises a connection body;
the connecting body is provided with a central hole.
8. The battery cell built-in current-guiding connecting device of claim 7, wherein the connecting body is provided with a reinforcing rib;
electrolyte diversion holes are formed in the reinforcing ribs.
9. The battery cell internal flow-guiding connector of claim 8, wherein the connector body is sized to match a cross-section of a cylindrical winding in the cylindrical power cell;
a plurality of strip-shaped reinforcing ribs are arranged on the surface of the connecting main body; the reinforcing rib extends from a region around the center hole to a direction away from the center hole in the connecting body.
10. A lithium ion power battery is characterized by comprising a cylindrical power battery cell;
the cylindrical power cell comprises an upper cover, the battery cell built-in flow-guiding connection device according to any one of claims 1 to 9 connected to the upper cover, and a cylindrical winding body connected to the battery cell built-in flow-guiding connection device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220540864.2U CN216980830U (en) | 2022-03-11 | 2022-03-11 | Built-in water conservancy diversion connecting device of battery electricity core and lithium ion power battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220540864.2U CN216980830U (en) | 2022-03-11 | 2022-03-11 | Built-in water conservancy diversion connecting device of battery electricity core and lithium ion power battery |
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| CN216980830U true CN216980830U (en) | 2022-07-15 |
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| CN202220540864.2U Active CN216980830U (en) | 2022-03-11 | 2022-03-11 | Built-in water conservancy diversion connecting device of battery electricity core and lithium ion power battery |
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