CN114300817A - Electrochemical device, battery module and electric equipment - Google Patents
Electrochemical device, battery module and electric equipment Download PDFInfo
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- CN114300817A CN114300817A CN202111639331.6A CN202111639331A CN114300817A CN 114300817 A CN114300817 A CN 114300817A CN 202111639331 A CN202111639331 A CN 202111639331A CN 114300817 A CN114300817 A CN 114300817A
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- 239000004020 conductor Substances 0.000 claims abstract description 86
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 238000005192 partition Methods 0.000 claims description 8
- 238000002360 preparation method Methods 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 17
- 239000011257 shell material Substances 0.000 description 34
- 229910000831 Steel Inorganic materials 0.000 description 27
- 239000010959 steel Substances 0.000 description 27
- 239000000523 sample Substances 0.000 description 14
- 239000007788 liquid Substances 0.000 description 13
- 125000006850 spacer group Chemical group 0.000 description 9
- 239000003792 electrolyte Substances 0.000 description 8
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000002985 plastic film Substances 0.000 description 6
- 229920006255 plastic film Polymers 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 229920001778 nylon Polymers 0.000 description 4
- 238000012856 packing Methods 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000005022 packaging material Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 238000002788 crimping Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
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- 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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- Connection Of Batteries Or Terminals (AREA)
Abstract
The application relates to an electrochemical device, which comprises a shell and an electrode assembly, wherein the shell comprises a conductive shell and a pole assembly, the pole assembly comprises a pole and an insulating sealing ring, the insulating sealing ring is sleeved on the pole, and the insulating sealing ring is positioned between the conductive shell and the pole; the pole comprises a first end part and a second end part, wherein the first end part is electrically connected with the electrode assembly, the second end part is exposed out of the conductive shell, and the second end part is used for being in contact with an external conductor; the electrochemical device also comprises a limiting structure, the limiting structure is annularly arranged on the end surface of the second end part and protrudes out of the end surface of the second end part; the external conductor can then directly contact with the end face of the second end part to carry out contact testing, the limiting structure is annularly arranged on the end face of the second end part, the limiting structure protrudes out of the end face of the second end part, the moving range of the external conductor on the end face can be limited through the limiting structure, and the external conductor can be effectively prevented from sliding off the pole.
Description
Technical Field
The application relates to the technical field of batteries, in particular to an electrochemical device, a battery module and electric equipment.
Background
Lithium ion batteries occupy an absolute leading position in the current consumer digital product market, and along with continuous innovation and research of technicians, various novel external packing materials emerge, so that the product market of lithium batteries is greatly enriched, and enterprises with great research and development strength are leading the direction of the whole industry. Among many lithium battery outer packaging materials, the steel case is gradually favored and paid attention by more and more people due to the superior pit punching performance and safety performance, and because the steel case material only comprises one layer of steel sheet, a designer can use the steel case as a negative electrode during battery design, and correspondingly, a battery using the steel case as an outer packaging material is also operated and produced.
When the steel shell battery is formed, a probe is required to be used for carrying out contact test on a steel shell (a negative electrode) and a positive electrode, and when the probe is used for carrying out test on the positive electrode, the probe is often short-circuited with the positive electrode and the negative electrode of the steel shell battery, so that the battery is short-circuited; therefore, a solution is needed to prevent the short circuit of the steel-shell battery during the formation test.
Disclosure of Invention
The application provides an electrochemical device, a battery module and electric equipment to the problem that the short circuit easily takes place when the steel-shelled battery that alleviates becomes the test.
The technical scheme of the application is realized as follows:
in a first aspect, embodiments of the present application provide an electrochemical device including a housing and an electrode assembly. The shell includes electrically conductive casing and utmost point post subassembly, electrically conductive casing enclose be equipped with accept the chamber and with accept the first opening of chamber intercommunication, utmost point post subassembly set up in first opening. The utmost point post subassembly includes utmost point post and insulating sealing washer, insulating sealing washer cover is located utmost point post, insulating sealing washer is located electrically conductive casing with between the utmost point post, insulating sealing washer be used for with utmost point post with it is insulating between the electrically conductive casing. The electrode assembly is contained in the containing cavity, and the pole comprises a first end portion and a second end portion. The first end is electrically connected with the electrode assembly, the second end is exposed outside the conductive shell, and the second end is used for being in contact with an external conductor. The electrochemical device further comprises a limiting structure, the limiting structure is annularly arranged on the end face of the second end portion, and the limiting structure protrudes out of the end face of the second end portion.
In the technical scheme of this application, the second tip appears outside electrically conductive housing, the external conductor then can directly contact in order to carry out the contact test with the terminal surface of second tip, the terminal surface of second tip is located to the limit structure ring, and limit structure protrusion in the terminal surface of second tip, can inject the range of movement of external conductor at above-mentioned terminal surface through limit structure, when the external conductor contacts with the second tip, limit structure can prevent effectively that the external conductor from following utmost point post landing, in order to reduce the accident that electrochemical device took place the short circuit.
According to some embodiments of the application, limit structure includes spacing portion, spacing portion with utmost point post integrated into one piece, just spacing portion protrusion in the terminal surface of second tip makes spacing portion with the second tip encloses synthetic spacing groove jointly. The limiting part and the pole are integrally formed, so that the strength is higher, redundant steps cannot be generated during assembly, and the installation mode is simpler; and spacing portion and second tip enclose synthetic spacing groove jointly, when the outer conductor carries out the contact test with utmost point post, the outer conductor can directly extend to spacing inslot and contact with the second tip, because the effect of spacing groove, the outer conductor can only slide in the spacing inslot, and the outer conductor can only slide at the terminal surface of second tip promptly to prevent that the outer conductor from following the landing on utmost point post.
According to some embodiments of the application, follow the first end of utmost point post is towards the direction of second end, the area of the cross section of spacing groove increases gradually, wherein, the cross section of spacing groove is the cross section of spacing groove along the first end of perpendicular to towards the direction of second end. When the external conductor extends to the limiting groove, the external conductor can extend from the bottom of the limiting groove along the inner side wall of the limiting groove until reaching the bottom of the limiting groove.
According to some embodiments of the application, the limiting part extends from the end face edge of the second end part, and the inner side wall of the limiting part is parallel to the outer peripheral side wall. The limiting portion extends upwards from the end face edge of the second end portion, so that the limiting portion surrounds a limiting groove on the end face of the second end portion, the inner side wall of the limiting portion is parallel to the outer side wall, the limiting groove is guaranteed to be provided with a large-size opening, and the external conductor extends in the limiting groove conveniently.
According to some embodiments of the application, be equipped with the partition part in the spacing groove, the partition part connect in at least two inner walls of spacing groove, the partition part be used for with the spacing groove separates for at least two grooves of awaiting measuring, every the groove of awaiting measuring all is used for acceping the outer conductor. When a plurality of external conductors are adopted for testing, one external conductor is correspondingly arranged in one groove to be tested so as to separate each external conductor, and therefore mutual interference among the external conductors is avoided.
According to some embodiments of the application, the limiting structure comprises a plurality of anti-slip grooves or a plurality of anti-slip bosses, and the plurality of anti-slip grooves or the plurality of anti-slip bosses are arranged on the end face of the second end portion. The anti-slip groove and/or the anti-slip boss are/is arranged, so that the roughness of the end face of the second end part can be increased, the friction force between the second end part and the external conductor is increased, and the slip of the external conductor on the end face of the second end part can be effectively reduced.
According to some embodiments of the present application, the anti-slip groove is tapered, and along the direction from the first end to the second end of the pole, the area of the cross section of the anti-slip groove is gradually increased, wherein the cross section of the anti-slip groove is the cross section of the anti-slip groove along the direction perpendicular to the first end to the second end. The opening in antiskid groove should be greater than the diameter of outer conductor, and the outer conductor can follow the opening in antiskid groove and get into the antiskid inslot to can extend to the bottom in antiskid groove gradually along the inner wall in antiskid groove, because the area of antiskid tank bottom is less, the outer conductor then is supported and is held the antiskid groove, makes the outer conductor can't slide in the antiskid inslot, thereby can easily fix the outer conductor.
According to some embodiments of the present application, the limiting structure includes an insulating limiting member, one end of the insulating limiting member is fixed to the conductive housing, and the other end of the insulating limiting member is surrounded by the peripheral wall of the second end portion and the peripheral wall of the limiting portion. The insulating limiting part is arranged on the peripheral side wall of the first end part and the peripheral side wall of the limiting part in a surrounding manner, so that when the pole rotates, the limiting part can prevent the pole from being in direct contact with the flange edge to cause short circuit; in addition, the insulating limiting part can also protect the pole from being damaged by external force so as to improve the safety performance of the electrochemical device.
According to some embodiments of the present application, in a second aspect, there is also provided a battery module including the electrochemical device according to the above-described embodiments.
According to some embodiments of the present application, in a third aspect, the present application further provides an electric device including the battery module according to the above embodiments.
In order to solve the above problem, in a third aspect, an embodiment of the present application further provides.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
Drawings
FIG. 1 is a schematic structural view of an electrochemical device according to some embodiments of the present application;
FIG. 2 is an exploded view of an electrochemical device according to some embodiments of the present application;
FIG. 3 is a partial enlarged view A of FIG. 2;
FIG. 4 is a schematic structural view of a pole assembly according to some embodiments of the present application;
fig. 5 is a schematic structural view of a post of some embodiments of the present application;
fig. 6 is a front view of a pole of some embodiments of the present application;
FIG. 7 is a schematic diagram of an insulating seal ring according to some embodiments of the present application;
fig. 8 is a schematic view of the internal structure of an electrochemical device according to some embodiments of the present application;
FIG. 9 is a partial enlarged view B of FIG. 8;
fig. 10 is a schematic view of the assembly of the pole assembly with the conductive housing according to some embodiments of the present application;
fig. 11 is a schematic structural view of a post of some embodiments of the present application;
fig. 12 is a schematic structural view of a post of some embodiments of the present application;
fig. 13 is a schematic structural view of a post of some embodiments of the present application;
fig. 14 is a schematic structural view of a post of some embodiments of the present application;
fig. 15 is a schematic structural view of a post according to some embodiments of the present application.
The reference numbers in the detailed description are as follows:
10. a conductive housing; 11. a first port; 12. a liquid injection hole; 13. a negative electrode post; 14. a flange edge; 15. an insulating member; 16. an accommodating cavity; 17. a top wall;
20. a pole assembly; 21. a pole column; 211. a first end portion; 2111. connecting columns; 2112. sleeving a cap; 212. a second end portion; 213. a limiting structure; 2131. a limiting part; 2132. an anti-slip groove; 2133. an anti-slip boss; 22. an insulating seal ring; 221. an insulating sleeve; 222. an insulating spacer; 223. a second port;
30. a limiting groove; 31. a partition member; 32. a groove to be measured;
40. an outer conductor;
50. an insulating stopper.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.
In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and "several" means one or more (including one). In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate the orientations and positional relationships indicated in the drawings, and are only for convenience of describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present application.
In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.
At present, lithium ion batteries occupy an absolute leading position in the current consumer digital product market, and with continuous innovation and research of technicians, various novel external packing materials emerge, so that the product market of lithium batteries is greatly enriched, and enterprises with great research and development strength are leading the direction of the whole industry. Among many lithium battery outer packing materials, the steel can is gradually favored and paid attention to by more and more people due to superior pit punching performance and safety performance, and accordingly, a battery using the steel can as an outer packing material is also operated.
For a steel shell battery, the difference between the steel shell battery and the aluminum plastic film is that the steel shell has only one layer of structure, namely a steel sheet, and the aluminum plastic film has three layers of structures, namely a nylon layer, an aluminum layer and a PP layer. Just because the steel shell material does not have nylon layer and PP layer, so the designer can regard steel shell itself as the negative pole when the battery design, and positive pole adopts the form of insulating seal riveting to keep apart with the steel shell body. Because the conventional function of the pole is used for testing various electrical properties of an external conductor, a terminal is inevitably led out of the outer surface of the steel shell, the terminal is usually designed to be positioned on the same plane as the liquid injection hole and higher than the plane where the liquid injection hole is positioned in consideration of the production process flow of the battery, and the thickness of the steel shell material body is very thin (generally between 50um and 150 um) in consideration of the energy density and other reasons. In addition, because the product adopts the laser welding process to carry out the welding of cap and casing, so usually will design the flange limit in the periphery of casing to closely laminate with the cap and carry out laser welding, but such design will certainly cause very big influence to later processes such as formation, capacity.
The steel shell battery only can be filled with electrolyte from the liquid filling hole, so the steel shell battery must keep a vertical state with the liquid filling hole facing upwards during liquid filling, gas can be generated inside the steel shell battery during formation, and the steel shell battery is usually formed in an open vertical manner for facilitating gas discharge.
To avoid short-circuiting of the battery during formation testing, embodiments of the present application, in a first aspect, provide an electrochemical device including a case (the case is not labeled in the drawings) and an electrode assembly (the electrode assembly is not shown in the drawings).
Referring to fig. 1, the housing includes a conductive shell 10 and a pole assembly 20, and the conductive shell 10 has only one layer, which is a steel sheet in this embodiment and is generally called a steel shell. It will be appreciated that the layer structure may also be made of other electrically conductive materials and is not limited to steel sheets in this embodiment. At present, hard-shell batteries are mainly classified into aluminum-shell batteries and steel-shell batteries, the outer shell of the aluminum-shell batteries is usually an aluminum-plastic film, and the aluminum-plastic film usually includes a nylon layer, an aluminum layer and a PP layer, compared with the aluminum-plastic film, the steel shell has higher physical stability and much higher compressive resistance than the aluminum-plastic film, and the nylon layer and the PP layer are omitted from the conductive housing 10 in this embodiment, so that the conductive housing 10 can also be used as a negative electrode of an electrochemical device.
The conductive case 10 is surrounded by a receiving cavity 16, the receiving cavity 16 is used for receiving the electrode assembly and the electrolyte, and the electrolyte soaks the electrode assembly in the receiving cavity 16. As shown in fig. 2 and 3, the top surface of the conductive housing 10 is further opened with a first through hole 11, and the first through hole 11 communicates the accommodating cavity 16 and the outside of the conductive housing 10.
Referring to fig. 1 to 3, the pole assembly 20 is disposed in the first opening 11, in this embodiment, the pole assembly 20 is a positive pole assembly 20 of an electrochemical device, and the conductive housing 10 is a negative pole, in order to prevent short circuit of the electrochemical device caused by contact between the positive pole and the negative pole, in this embodiment, the pole assembly 20 includes a pole 21 and an insulating sealing ring 22, and the insulating sealing ring 22 is used to separate the pole 21 from the conductive housing 10.
Referring to fig. 4, the insulating sealing ring 22 is sleeved on the electrode post 21, and the insulating sealing ring 22 is located between the conductive housing 10 and the electrode post 21 for insulating the electrode post 21 from the conductive housing 10 to prevent short circuit of the electrochemical device.
As for the pole 21, specifically, the pole 21 includes a first end portion 211 and a second end portion 212, as shown in fig. 5 and 6, the first end portion 211 and the second end portion 212 are oppositely disposed, the first end portion 211 includes a connection post 2111 and a sleeve cap 2112, the connection post 2111 is used for connecting to the sleeve cap 2112 and the second end portion 212, the connection post 2111 can be selected to be cylindrical, the sleeve cap 2112 can be selected to be flat and circular plate-shaped, the sleeve cap 2112 is disposed at one end of the connection post 2111 and is coaxially disposed with the connection post 2111, and the second end portion 212 is connected to the other end of the connection post 2111. Alternatively, the second end 212 may be flat, as shown in fig. 5, and the second end 212 may be flat and rectangular with rounded corners, and the diameter of each of the four rounded corners may be set to 0.7 mm. It is understood that the shapes of the first end portion 211 and the second end portion 212 may be selected according to specific scenarios, and are not limited to the disc shape or the rounded rectangular shape of the above-described embodiments. The connection post 2111 can be connected to the center of the second end portion 212. as can be seen from fig. 6, the second end portion 212 is perpendicular to the connection post 2111. along the horizontal direction in fig. 6, the diameter of the cap 2112 and the length of the second end portion 212 are both larger than the diameter of the connection post 2111, so that a spacing space is formed between the cap 2112 and the second end portion 212.
The electrode assembly is disposed in the accommodating cavity 16, and includes a positive electrode plate, a separator and a negative electrode plate, the separator is disposed between the positive electrode plate and the negative electrode plate for separating the positive electrode plate and the negative electrode plate, and the positive electrode plate, the separator and the negative electrode plate are sequentially stacked and wound to form the electrode assembly.
The first end 211 of the electrode post 21 is electrically connected to the electrode post assembly 20, the second end 212 is exposed outside the conductive housing 10, and the second end 212 is used for contacting the external conductor 40. The outer dimension of the second end portion 212 may be set larger than the outer dimension of the cap 2112 to ensure a larger crimping area of the second end portion 212 and the conductive housing 10, thereby making the installation of the pole 21 more stable. The insulating seal ring 22 is partially sleeved on the connecting post 2111, the other part of the insulating seal ring 22 covers the bottom of the second end part 212, when the pole assembly 20 is arranged in the first through hole 11, the connecting post 2111 is located in the first through hole 11, the sleeve cap 2112 and the first end part 211 are clamped on the top wall 17 of the conductive shell 10 together, the part of the insulating seal ring 22 sleeved on the connecting post 2111 separates the inner wall of the first through hole 11 and the connecting post 2111, and the part of the insulating seal ring 22 covering the bottom of the second end part 212 separates the outer surface of the second end part 212 and the outer surface of the conductive shell 10, so that the whole pole 21 is insulated from the conductive shell 10, and the conductive shell 10 is prevented from being in direct contact with the pole 21 to cause short circuit.
Referring to fig. 1, the liquid inlet 12 and the negative electrode post 13 of the electrochemical device are also formed in the top wall 17 of the conductive case 10, and the liquid inlet 12 is not normally sealed during the formation of the electrochemical device, so that the electrochemical device needs to be formed in a vertical manner. For an electrochemical device adopting a vertical formation process, the pole 21 located on the top wall 17 of the conductive housing 10 can be generally set to be higher than the plane where the liquid injection hole 12 is located, the size of the pole 21 is generally small, the pole 21 protrudes out of the top wall 17 of the conductive housing 10, and the upper surface of the pole 21 is the contact part of the probe; note that the probe in this embodiment is the outer conductor 40. The pole 21 and the liquid injection hole 12 are located on the top wall 17 of the conductive casing 10, which requires that the probe must also move vertically downward and contact with the pole 21, when the electrochemical device is slightly inclined due to positioning error, the probe is likely to slide relatively on the upper surface of the pole 21, and because the width of the pole 21 is usually narrow, the probe is likely to slide off the pole 21, and short circuit between the probe and the positive and negative electrodes of the electrochemical device is likely to occur. Therefore, in the present embodiment, the electrochemical device further includes a stopper structure 213.
Referring to fig. 5, the limiting structure 213 is disposed around the end surface of the second end portion 212, and the limiting structure 213 protrudes from the end surface of the second end portion 212, and the limiting structure 213 is used for limiting the external conductor 40. It is understood that the end surface of the second end portion 212 is the upper surface of the second end portion 212 in fig. 5, the limiting structure 213 is arranged to surround the upper surface of the second end portion 212 in a circle, the outer conductor 40 can be a probe, and when the probe performs a contact test on the upper surface of the pole 21, the limiting structure 213 limits the probe to slide in only one circle of the end surface of the second end portion 212, so as to prevent the probe from sliding off the pole 21.
According to some embodiments of the present disclosure, referring to fig. 1 and 3, the second end portion 212 is exposed outside the conductive housing 10, the external conductor 40 can directly contact with an end surface of the second end portion 212 for a contact test, the limiting structure 213 is disposed around the end surface of the second end portion 212, and the limiting structure 213 protrudes from the end surface of the second end portion 212, the limiting structure 213 can limit a moving range of the external conductor 40 on the end surface, and when the external conductor 40 contacts the second end portion 212, the limiting structure 213 can effectively prevent the external conductor 40 from sliding off the electrode post 21, so as to reduce an accident of short circuit of the electrochemical device. It is understood that the present embodiment is not limited to steel-can batteries, but is also applicable to other electrochemical devices having a housing as a negative electrode.
According to some embodiments of the present application, referring to fig. 3, fig. 4 and fig. 7, the insulating sealing ring 22 includes an insulating sleeve 221 and an insulating gasket 222, the insulating sleeve 221 is connected to the insulating gasket 222, the insulating sealing ring 22 is provided with a second opening 223 penetrating through the insulating sleeve 221 and the insulating gasket 222, the insulating sleeve 221 is received in the first opening 11 of the conductive housing 10, and the insulating gasket 222 is disposed on the outer surface of the conductive housing 10. The first end 211 is inserted into the second opening 223, and the second end 212 is located on the surface of the insulating gasket 222 facing away from the conductive housing 10.
It is understood that, as shown in fig. 8 and 9, the insulating member 15 is disposed in the receiving cavity 16 of the conductive housing 10, and the insulating member 15 is disposed on the inner wall of the conductive housing 10 near the first through opening 11. When the pole 21 is arranged at the first through hole 11 of the conductive shell 10, the sleeve cap 2112 of the pole 21 is clamped on the insulating piece 15, and the insulating piece 15 is used for insulating the sleeve cap 2112 and the conductive shell 10; the second end 212 of the pole 21 contacts with the outer surface of the conductive housing 10, so that an insulating gasket 222 needs to be disposed between the second end 212 and the outer surface of the conductive housing 10 for insulation; the connection post 2111 contacts the inner wall of the first through hole 11, so that an insulating sleeve 221 needs to be provided between the connection post 2111 and the inner wall of the first through hole 11 for insulation.
Referring to fig. 4 and 7, in the present embodiment, the insulating sleeve 221 is disposed at the bottom of the insulating spacer 222, the insulating sleeve 221 is perpendicular to the insulating spacer 222, the insulating sleeve 221 can be disposed at a central position of the bottom of the insulating spacer 222, the second through hole 223 penetrates from the insulating spacer 222 to the insulating sleeve 221, and an axis of the second through hole 223 is perpendicular to the insulating spacer 222. In this embodiment, a second opening 223 is formed through the insulating sleeve 221 and the insulating spacer 222, the first end portion 211 is inserted into the second opening 223, the insulating sleeve 221 insulates the inner walls of the first end portion 211 and the second opening 223, and the insulating spacer 222 insulates the second end portion 212 and the outer surface of the conductive housing 10, so that the entire pole 21 is not in contact with the conductive housing 10, and short circuit is prevented.
According to some embodiments of the present application, referring to fig. 5, the limiting structure 213 includes a limiting portion 2131, the limiting portion 2131 is integrally formed with the post 21, and the limiting portion 2131 protrudes out of the end surface of the second end portion 212, so that the limiting portion 2131 and the second end portion 212 jointly enclose the limiting groove 30.
Referring to fig. 5, the position-limiting portion 2131 is a blocking wall (the blocking wall is not shown) protruding from the end surface of the second end portion 212, and the blocking wall is integrally formed with the second end portion 212 to improve the integrity of the position-limiting portion 2131 and the second end portion 212. It can be understood that the separate limiting portion 2131 is disposed on the end surface of the second end portion 212 by bonding or welding, which increases the number of mounting steps and makes the assembly of the electrochemical device more complicated; the limiting portion 2131 formed integrally has higher strength, redundant steps are not generated during assembly, and the installation mode is simpler. The blocking wall is formed in a circle on the end surface of the second end portion 212, so that the end surface of the second end portion 212 and the limiting portion 2131 form a limiting groove 30. When the external conductor 40 is in contact test with the pole 21, the external conductor 40 can directly extend into the limiting groove 30 and contact with the second end 212, and due to the action of the limiting groove 30, the external conductor 40 can only slide in the limiting groove 30, that is, the external conductor 40 can only slide on the end surface of the second end 212, so as to prevent the external conductor 40 from sliding off the pole 21.
According to some embodiments of the present disclosure, referring to fig. 11, the cross-sectional area of the limiting groove 30 gradually increases along a direction from the first end 211 to the second end 212 of the pole 21, wherein the cross-section of the limiting groove 30 is a cross-section of the limiting groove 30 along a direction perpendicular to the direction from the first end 211 to the second end 212.
In general, the end surface of the second end portion 212 is a smooth plane, when the external conductor 40 performs a contact test with the terminal post 21, the external conductor 40 inevitably slides on the end surface of the second end portion 212, and even if the external conductor 40 abuts against the inner side wall of the position-limiting groove 30, since the end surface of the second end portion 212 is too smooth, the external conductor 40 inevitably slides along the inner side wall of the position-limiting groove 30, which is not favorable for fixing the external conductor 40 on the end surface of the second end portion 212.
Therefore, in the present embodiment, referring to fig. 11, in a direction from top to bottom in fig. 11, the cross section of the limiting groove 30 gradually decreases until the inner sidewall and the bottom of the limiting groove 30 converge to a point, and the area of the converged point is smaller than the cross-sectional area of the outer conductor 40; it will be appreciated that the outer conductor 40 may be a probe and that the cross-section of the outer conductor 40 is a section perpendicular to the length of the outer conductor 40. When the external conductor 40 extends into the limiting groove 30, the external conductor 40 extends toward the bottom of the limiting groove 30 along the inner side wall of the limiting groove 30 until reaching the bottom of the limiting groove 30, and since the area of the bottom of the limiting groove 30 is smaller than the cross section of the external conductor 40, the external conductor 40 abuts against the limiting groove 30, and the external conductor 40 does not slide in the limiting groove 30, so that the external conductor 40 can be easily fixed. In this embodiment, the cross-sectional area of the opening of the restraint slot 30 is maximized so that the outer conductor 40 extends directly into the restraint slot 30.
According to some embodiments of the present application, referring to fig. 5, the limiting portion 2131 extends from an end surface edge of the second end portion 212, and an inner sidewall and an outer sidewall of the limiting portion 2131 are parallel.
Referring to fig. 1, the area of the end surface of the second end portion 212 is generally small, so that in order to facilitate the external conductor 40 to extend into the limiting groove 30, the limiting groove 30 needs to have a larger-sized opening, and since the conductive housing 10 has the flange 14, a certain space needs to be reserved between the terminal 21 and the flange 14 to prevent the terminal 21 from contacting the flange 14 to cause a short circuit. Therefore, in a normal case, the peripheral sidewall of the second end portion 212 is disposed parallel to the flange 14, so as to ensure a large reserved space between the second end portion 212 and the flange 14 as much as possible. In this embodiment, to ensure that the limiting groove 30 has a larger-sized opening, the limiting portion 2131 extends upward from the end surface edge of the second end portion 212, so that the limiting portion 2131 surrounds the end surface of the second end portion 212 to form the limiting groove 30, and the inner sidewall and the outer sidewall of the limiting portion 2131 are parallel to each other, so as to ensure that the limiting groove 30 has a larger-sized opening, so that the outer conductor 40 extends into the limiting groove 30.
According to some embodiments of the present application, the stopper portion 2131 is further provided with a drain hole (not shown in the drawings), which communicates with the stopper groove 30. The external injection device can inject the electrolyte into the receiving cavity 16 through the injection hole 12 of the conductive casing 10, and the electrochemical device inevitably receives a part of the electrolyte in the limiting groove 30 during the injection process, which may cause pollution. Therefore, the liquid discharge hole may be provided in the limiting groove 30 so as to discharge the electrolyte remaining in the limiting groove 30.
Further, according to some embodiments of the present disclosure, the number of the liquid discharge holes may be set to be plural, and the plural liquid discharge holes are opened on the peripheral sidewall of the limiting groove 30. The electrochemical device may be inclined due to positioning error, and if the drain hole is formed only on one side wall of the limiting groove 30, when the electrochemical device is just not provided with the drain hole in the tilting direction, the electrolyte in the limiting groove 30 is difficult to be drained in time. Therefore, in the present embodiment, by providing a plurality of drain holes opened in the peripheral sidewall of the limiting groove 30, the electrolyte in the limiting groove 30 can be discharged in time regardless of the direction from which the electrochemical device is tilted.
According to some embodiments of the present application, referring to fig. 12, a separating member 31 is disposed in the limiting groove 30, the separating member 31 is connected to at least two inner walls of the limiting groove 30, the separating member 31 is used for separating the limiting groove 30 into at least two to-be-measured grooves 32, and each to-be-measured groove 32 is used for accommodating an external conductor 40.
In testing, a plurality of outer conductors 40 may be used, and in order to avoid confusion caused by the interference of the outer conductors 40, it is necessary to separate the outer conductors 40. In the present embodiment, the spacing groove 30 is divided into at least two to-be-measured grooves 32 by providing the dividing member 31 in the spacing groove 30, and it can be understood that the number of to-be-measured grooves 32 may be set to be equal to or greater than the number of external conductors 40. When a plurality of outer conductors 40 are used for testing, one outer conductor 40 is correspondingly disposed in one slot to be tested 32 to separate each outer conductor 40.
According to some embodiments of the present disclosure, referring to fig. 13 and 14, the limiting structure 213 includes a plurality of anti-slip grooves 2132 or a plurality of anti-slip protrusions 2133, and the plurality of anti-slip grooves 2132 or the plurality of anti-slip protrusions 2133 are disposed on an end surface of the second end portion 212. The end surface of the second end 212 is provided with the anti-slip groove 2132 and/or the anti-slip boss 2133, so that the roughness of the end surface of the second end 212 can be increased, the friction force between the second end 212 and the external conductor 40 can be increased, and the sliding of the external conductor 40 on the end surface of the second end 212 can be effectively slowed down.
According to some embodiments of the present disclosure, referring to fig. 15, the anti-slip groove 2132 is tapered, and the area of the cross section of the anti-slip groove 2132 gradually increases along the direction from the first end 211 to the second end 212 of the pole 21, wherein the cross section of the anti-slip groove 2132 is the cross section of the anti-slip groove 2132 along the direction perpendicular to the direction from the first end 211 to the second end 212.
Referring to fig. 15, a plurality of anti-slip grooves 2132 are disposed in the limiting groove 30, so that a plurality of external conductors 40 can be fixed in the anti-slip grooves 2132, and the area of the cross section of the anti-slip grooves 2132 is gradually reduced from the second end 212 to the first end 211, it can be understood that the opening of the anti-slip groove 2132 should be larger than the diameter of the external conductor 40, and the external conductor 40 can enter the anti-slip groove 2132 from the opening of the anti-slip groove 2132 and can gradually extend to the bottom of the anti-slip groove 2132 along the inner wall of the anti-slip groove 2132, and because the area of the bottom of the anti-slip groove 2132 is smaller, the external conductor 40 is supported by the anti-slip groove 2132, so that the external conductor 40 cannot slide in the anti-slip groove 2132, and the external conductor 40 can be easily fixed.
According to some embodiments of the present application, referring to fig. 10, the limiting structure 213 includes an insulating limiting member 50, one end of the insulating limiting member 50 is fixed to the conductive housing 10, and the other end of the insulating limiting member 50 surrounds the peripheral wall of the second end portion 212 and the peripheral wall of the limiting portion 2131.
Referring to fig. 10, the conductive housing 10 is generally welded to the housing cover by a laser welding process, so that a flange 14 is designed on the periphery of the conductive housing 10 to facilitate the housing cover and the housing cover to be tightly attached to each other and laser welded. The connection mode of the pole post assembly 20 and the conductive shell 10 can adopt a riveting mode, the pole post assembly 20 in the riveting mode often has the phenomenon that the pole post 21 is subjected to some external force in the using process so as to cause the pole post 21 to rotate, and once the pole post 21 rotates, the pole post 21 possibly generates short circuit with the flange edge 14 so as to cause short circuit of the electrochemical device.
Therefore, in the present embodiment, by enclosing the insulating stopper 50 around the circumferential sidewall of the first end portion 211 and the circumferential sidewall of the stopper portion 2131, the stopper portion 2131 can prevent the terminal 21 from directly contacting the flange 14 and causing a short circuit when the terminal 21 rotates; in addition, the insulation stopper 50 can protect the terminal post 21 from external force, so as to improve the safety of the electrochemical device.
According to some embodiments of the present application, in a second aspect, there is also provided a battery module including the electrochemical device according to any one of the above embodiments.
According to some embodiments of the present application, in a third aspect, the present application further provides an electric device including the battery module according to the above embodiments.
According to some embodiments of the present application, please refer to fig. 2 and fig. 3, during installation, the insulating sealing ring 22 is firstly sleeved on the pole 21, and then the pole assembly 20 is disposed at the first opening 11 of the conductive housing 10, the insulating member 15 is disposed on the inner wall of the conductive housing 10 at a position close to the first opening 11, and a third opening (not shown) is disposed on the insulating member 15, and the position of the third opening corresponds to the position of the first opening 11 in the vertical direction. The connection post 2111 of the terminal 21 passes through the first through hole 11 and the third through hole, the cap 2112 of the terminal 21 abuts on the surface of the insulating member 15 away from the first through hole 11, and the second end 212 is exposed on the outer surface of the conductive housing 10. The insulating sleeve 221 of the insulating seal 22 is disposed between the connection post 2111 and the inner wall of the first through opening 11 for insulating the connection post 2111 from the first through opening 11, and the insulating spacer 222 is disposed between the second end 212 and the outer surface of the conductive housing 10 for insulating the second end 212 from the conductive housing 10. The limiting portion 2131 extends upwards from the edge of the end surface of the second end portion 212, so that a limiting groove 30 is formed between the limiting portion 2131 and the end surface of the second end portion 212. When the external conductor 40 performs a contact test on the pole 21, the limiting groove 30 limits the sliding range of the external conductor 40 on the end surface of the second end 212, and limits that the external conductor 40 can only slide in the limiting groove 30 on the end surface of the second end 212, so as to prevent the external conductor 40 from sliding off the pole 21, and thus the external conductor 40 can be effectively prevented from being shorted with the pole 21 and the conductive housing 10.
It should be noted that the description of the present application and the accompanying drawings set forth preferred embodiments of the present application, however, the present application may be embodied in many different forms and is not limited to the embodiments described in the present application, which are not intended as additional limitations to the present application, but are provided for the purpose of providing a more thorough understanding of the present disclosure. Moreover, the above-mentioned technical features are combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope described in the present specification; further, modifications and variations may occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the scope of the appended claims.
Claims (10)
1. An electrochemical device comprising a housing and an electrode assembly;
the shell comprises a conductive shell and a pole assembly, the conductive shell is surrounded by an accommodating cavity and a first through opening communicated with the accommodating cavity, and the pole assembly is arranged at the first through opening; the pole assembly comprises a pole and an insulating sealing ring, the insulating sealing ring is sleeved on the pole and is positioned between the conductive shell and the pole, and the insulating sealing ring is used for insulating the pole and the conductive shell;
the electrode assembly is accommodated in the accommodating cavity; it is characterized in that the preparation method is characterized in that,
the pole comprises a first end part and a second end part;
the first end part is electrically connected with the electrode assembly, the second end part is exposed outside the conductive shell, and the second end part is used for being in contact with an external conductor;
the electrochemical device further comprises a limiting structure;
the limiting structure is annularly arranged on the end face of the second end portion, and protrudes out of the end face of the second end portion.
2. The electrochemical device according to claim 1, wherein the limiting structure comprises a limiting portion, the limiting portion is integrally formed with the terminal, and the limiting portion protrudes from an end surface of the second end portion, so that the limiting portion and the second end portion jointly enclose a limiting groove.
3. The electrochemical device according to claim 2, wherein the area of the cross section of the limiting groove gradually increases along a direction from the first end to the second end of the electrode post, wherein the cross section of the limiting groove is a cross section of the limiting groove along a direction perpendicular to the first end to the second end.
4. The electrochemical device as claimed in claim 2, wherein the stopper extends from an end surface edge of the second end portion, and an inner sidewall of the stopper is parallel to an outer peripheral sidewall.
5. The electrochemical device according to claim 3 or 4, wherein a partition member is disposed in the limiting groove, the partition member is connected to at least two inner walls of the limiting groove, the partition member is configured to partition the limiting groove into at least two grooves to be measured, and each of the grooves to be measured is configured to accommodate an external conductor.
6. The electrochemical device as claimed in claim 1, wherein the stopper structure comprises a plurality of anti-slip grooves or a plurality of anti-slip protrusions, and the plurality of anti-slip grooves or the plurality of anti-slip protrusions are disposed on the end surface of the second end portion.
7. The electrochemical device according to claim 6, wherein the anti-slip groove is tapered, and the area of the cross section of the anti-slip groove gradually increases along a direction from the first end to the second end of the post, wherein the cross section of the anti-slip groove is a cross section of the anti-slip groove along a direction perpendicular to the direction from the first end to the second end.
8. The electrochemical device according to claim 2, wherein the limiting structure comprises an insulating limiting member, one end of the insulating limiting member is fixed to the conductive housing, and the other end of the insulating limiting member surrounds the peripheral sidewall of the second end portion and the peripheral sidewall of the limiting portion.
9. A battery module comprising the electrochemical device according to any one of claims 1 to 8.
10. An electric device characterized by comprising the battery module according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111639331.6A CN114300817A (en) | 2021-12-29 | 2021-12-29 | Electrochemical device, battery module and electric equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111639331.6A CN114300817A (en) | 2021-12-29 | 2021-12-29 | Electrochemical device, battery module and electric equipment |
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| CN114300817A true CN114300817A (en) | 2022-04-08 |
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| CN202111639331.6A Pending CN114300817A (en) | 2021-12-29 | 2021-12-29 | Electrochemical device, battery module and electric equipment |
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