CN118173969A - Battery shell structure and battery - Google Patents
Battery shell structure and battery Download PDFInfo
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- CN118173969A CN118173969A CN202410600172.6A CN202410600172A CN118173969A CN 118173969 A CN118173969 A CN 118173969A CN 202410600172 A CN202410600172 A CN 202410600172A CN 118173969 A CN118173969 A CN 118173969A
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- Prior art keywords
- explosion
- proof valve
- side wall
- valve body
- thickness
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- 230000035515 penetration Effects 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 38
- 238000003466 welding Methods 0.000 description 68
- 238000002844 melting Methods 0.000 description 52
- 230000008018 melting Effects 0.000 description 52
- 239000001307 helium Substances 0.000 description 41
- 229910052734 helium Inorganic materials 0.000 description 41
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 41
- 230000009286 beneficial effect Effects 0.000 description 11
- 238000001514 detection method Methods 0.000 description 10
- 239000011324 bead Substances 0.000 description 7
- 239000002893 slag Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000004880 explosion Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 208000010392 Bone Fractures Diseases 0.000 description 3
- 206010017076 Fracture Diseases 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
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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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- Gas Exhaust Devices For Batteries (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention relates to the technical field of batteries, and discloses a battery shell structure and a battery, wherein the battery shell structure comprises: the explosion-proof valve body comprises a groove surface and a boss part encircling the circumferential edge of the groove surface; the inner wall of the shell body is enclosed to form a containing cavity; the shell body comprises at least one target side wall, and one side of the target side wall, which is far away from the accommodating cavity, is connected with the explosion-proof valve body; the side wall of the target is provided with a through hole; a sinking groove corresponding to the through hole is formed in one side, close to the explosion-proof valve body, of the target side wall, and the sinking groove is suitable for accommodating the explosion-proof valve body; the side wall of the target forms a supporting part along the thickness direction of the side wall of the target, which is far away from the explosion-proof valve body, and the supporting part is suitable for supporting the boss part; the depth of the sinking groove is C, C meets the condition that J-C is less than or equal to minus 0.15 and less than or equal to 0.15 and mm, wherein J is the thickness of the boss part. The battery shell structure provided by the invention can reduce the air leakage risk of the explosion-proof valve in the working process of the battery and improve the safety and reliability of the battery.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery shell structure and a battery.
Background
With the increasing maturity of lithium ion battery technology, lithium ion batteries are widely used as power batteries in the fields of electric automobiles and energy storage. The lithium battery shell and the explosion-proof valve are core assembly components related to the safety of the battery cell, and the structural design of the lithium battery shell and the explosion-proof valve is important to the safety of the battery cell.
However, in the prior art, the tightness of the explosion-proof valve is difficult to be ensured in the process of manufacturing the explosion-proof valve and the shell, so that the explosion-proof valve leaks air in the working process of the battery easily, and the safety and the reliability of the battery are affected.
Disclosure of Invention
In view of the above, the invention provides a battery housing structure and a battery, which are used for solving the problems that the tightness of the explosion-proof valve is difficult to ensure in the process of manufacturing the explosion-proof valve and the housing, and the explosion-proof valve is easy to leak air in the working process of the battery.
In a first aspect, the present invention provides a battery case structure comprising:
the explosion-proof valve body comprises a groove surface and a boss part encircling the circumferential edge of the groove surface;
the inner wall of the shell body is enclosed to form a containing cavity; the shell body comprises at least one target side wall, and one side, far away from the accommodating cavity, of the target side wall along the thickness direction of the target side wall is connected with the explosion-proof valve body;
The side wall of the target is provided with a through hole; a sinking groove corresponding to the through hole is formed in one side, close to the explosion-proof valve body, of the target side wall along the thickness direction of the target side wall, and the sinking groove is suitable for accommodating the explosion-proof valve body; the side wall of the target forms a supporting part along the thickness direction of the side wall of the target, which is far away from the explosion-proof valve body, and the supporting part is suitable for supporting the boss part;
The depth of the sinking groove is C, C meets the condition that J-C is less than or equal to minus 0.15 and less than or equal to 0.15 and mm, wherein J is the thickness of the boss part.
The beneficial effects are that: according to the battery shell structure provided by the invention, the supporting part is formed on one side, far away from the explosion-proof valve body, of the target side wall along the thickness direction of the target side wall, on one hand, the boss part can be supported by the supporting part, so that the stability of the explosion-proof valve body during welding is ensured, and the welding yield and the tightness of the explosion-proof valve body are ensured; the depth C of the sinking groove is less than or equal to 0.15 mm and less than or equal to J-C and less than or equal to 0.15 mm, wherein J is the thickness of the boss part, so that on one hand, the welding seam deviation between the explosion-proof valve body and the target side wall can be effectively avoided, the welding strength between the explosion-proof valve body and the target side wall is ensured, the phenomenon of explosion holes and/or air leakage is avoided, the welding yield of the explosion-proof valve body is improved, the tightness between the explosion-proof valve body and the target side wall is ensured, on the other hand, the pack (battery pack) can be prevented from damaging the explosion-proof valve body in the battery grouping process, the tightness of the explosion-proof valve body is ensured, the battery leakage is avoided, meanwhile, the thickness of structural adhesive assembly is ensured, the assembly precision between the battery and the pack is ensured, and on the other hand, the thickness of the supporting part is ensured, so that the supporting part effectively supports the explosion-proof valve body, and the welding yield and the tightness of the explosion-proof valve body are ensured; and then reduce the gas leakage risk of explosion-proof valve in the battery working process, improve the security and the reliability of battery.
In an alternative embodiment, the outer edge of the boss portion is circumferentially provided with a first connecting portion;
the target side wall is provided with a second connecting part corresponding to the first connecting part;
The first connecting part is suitable for being welded with the second connecting part to form a third connecting part, the third connecting part is positioned at one side of the target side wall far away from the accommodating cavity along the thickness direction of the target side wall, and the third connecting part is suitable for sealing and connecting the explosion-proof valve body with the shell body.
The beneficial effects are that: support through supporting part to explosion-proof valve body's thickness direction one side, with the second connecting portion welding formation third connecting portion of explosion-proof valve body's first connecting portion and target lateral wall again, stability when can enough guaranteeing explosion-proof valve body and target lateral wall welding to guarantee explosion-proof valve body's welding yield and leakproofness, welding slag and/or bead drop to housing body's holding intracavity when can preventing the welding again, in order to avoid welding slag and/or bead to damage the utmost point group when follow-up assembly, thereby avoid causing utmost point group short circuit.
In an alternative embodiment, the third connection has a penetration B, where B satisfies 0.25 mm.ltoreq.B.ltoreq.0.8xT, where T is the thickness of the target sidewall.
The beneficial effects are that: the penetration B of the third connecting part is less than or equal to 0.25 mm and less than or equal to 0.8 xT through meeting the requirement, wherein T is the thickness of the target side wall, on one hand, the welding strength between the explosion-proof valve body and the target side wall can be ensured, the gas leakage in the using process of the battery is avoided, thereby improving the reliability of the battery, on the other hand, the supporting part is prevented from deforming greatly, thereby preventing the pole group from being damaged when the pole group is assembled into the shell, avoiding causing the pole group to be short-circuited, on the other hand, the welding through supporting part is avoided, the gas leakage of the shell body is prevented, and the tightness of the battery is ensured.
In an alternative embodiment, the thickness of the support portion is D, D satisfying 0.3 mm. Ltoreq.D < T.
The beneficial effects are that: the thickness D of the supporting part is more than or equal to 0.3 mm and less than or equal to D and less than T, so that the explosion-proof valve body can be effectively supported, and the surface of the supporting part is prevented from cracking in the stamping process; simultaneously, in the welding process, can guarantee that the deformation of supporting part is in controllable within range, avoid damaging the utmost point group when the utmost point group goes into the shell, prevent to cause utmost point group short circuit, can avoid welding through supporting part moreover, avoid casing body gas leakage, guarantee the leakproofness of battery.
In an alternative embodiment, the third connection has a width A, A satisfying 0.5 mm.ltoreq.A.ltoreq.7XJ.
The beneficial effects are that: the width A of the third connecting part is less than or equal to 0.5 mm and less than or equal to 7 XJ, so that on one hand, the welding strength between the explosion-proof valve body and the target side wall can be ensured, air leakage in the use process of the battery is avoided, the reliability of the battery is improved, on the other hand, the welding seam in the welding process can be prevented from extending to the non-body part of the explosion-proof valve body, the shape of the nick affecting the explosion-proof valve body is prevented from being influenced, the reliability of the explosion-proof valve is improved, and air leakage of the explosion-proof valve is prevented from being caused.
In an alternative embodiment, the target sidewall is chamfered on both sides in the width direction; the distance between the sinking groove and the chamfer is E, and E meets E not less than 1 mm.
The beneficial effects are that: the distance E between the sinking groove and the chamfer is more than or equal to 1 mm by meeting E, so that the shell body can be effectively ensured to form a through hole and the sinking groove in the stamping process, the deformation of the shell body is avoided, the shielding of the sinking groove by a welding blanket in the welding process can be avoided, and the smooth welding of the explosion-proof valve body is ensured.
In an alternative embodiment, at least part of the area of the groove surface, which is close to the boss part, is recessed to form a notch section, and one side, which is far away from the boss part, of the notch section is suitable for being circumferentially surrounded to form an opening surface;
The residual thickness of the notch section is K, K is more than or equal to 0.030 mm and less than or equal to K and less than L and less than J, wherein L is the thickness of the notch surface.
The beneficial effects are that: the residual thickness K of the notch section is less than or equal to K and less than or equal to 0. mm and less than L and less than J, wherein L is the thickness of the notch surface, so that on one hand, the stability and the reliability of the explosion-proof valve can be ensured, and on the other hand, the explosion-proof valve can be ensured to be opened and decompressed in time.
In an alternative embodiment, at least a part of the recess surface adjacent to the boss portion is further provided with a connecting section adapted to connect at least a part of the opening surface with the recess surface.
The beneficial effects are that: the opening surface is at least partially connected with the groove surface through the connecting section, so that the whole opening surface flies out after the explosion-proof valve is opened, and short circuit is prevented.
In an alternative embodiment, the thickness of the connecting section is M, M satisfying K < M.ltoreq.L.
The beneficial effects are that: the thickness M of the connecting section is smaller than M and smaller than or equal to L through meeting K, so that the connection strength between the opening surface and the groove surface is ensured, and the whole opening surface is effectively prevented from flying out after the explosion-proof valve is opened.
In a second aspect, the present invention also provides a battery comprising: a battery body, and a battery case structure as described above.
The beneficial effects are that: the battery of the second aspect includes the battery case structure of the first aspect, and therefore, the battery of the second aspect includes all the advantageous effects of the battery case structure of the first aspect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a front view of a battery case structure according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of section P-P of FIG. 1;
FIG. 3 is an enlarged partial schematic view of the portion W in FIG. 2;
FIG. 4 is a schematic view of the explosion-proof valve body shown in FIG. 3 after being concealed;
FIG. 5 is a partially enlarged schematic illustration of FIG. 3 at G;
FIG. 6 is a schematic view of the structure of FIG. 5 after the welding process is completed;
FIG. 7 is an enlarged partial schematic view at Q in FIG. 1;
FIG. 8 is an enlarged partial schematic view at S in FIG. 7;
Fig. 9 is a schematic cross-sectional view of an explosion-proof valve body of a battery case structure according to an embodiment of the present invention.
Reference numerals illustrate:
10. an explosion-proof valve body; 101. a first connection portion; 11. scoring the segment; 12. a boss portion; 13. a groove surface; 14. a connection section; 15. an opening surface;
20. A housing body; 201. a receiving chamber; 202. a through hole; 203. sinking grooves;
21. A target sidewall;
211. A support part; 212. a second connecting portion; 213. a third connecting portion; 214. chamfering.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
An embodiment of the present invention is described below with reference to fig. 1 to 9.
According to an embodiment of the present invention, in one aspect, there is provided a battery case structure including:
An explosion-proof valve body 10;
The housing body 20, as shown in fig. 2, has an inner wall enclosing a receiving cavity 201; as shown in fig. 3, the housing body 20 includes at least one target sidewall 21, and the target sidewall 21 is connected to the explosion-proof valve body 10 along a side of its thickness direction away from the accommodating chamber 201;
As shown in fig. 4, the target sidewall 21 is provided with a through hole 202; a sinking groove 203 corresponding to the through hole 202 is formed in one side of the target side wall 21, which is close to the explosion-proof valve body 10 along the thickness direction of the target side wall, and the sinking groove 203 is suitable for accommodating the explosion-proof valve body 10; the target side wall 21 forms a support portion 211 on a side thereof distant from the explosion-proof valve body 10 in its own thickness direction, the support portion 211 being adapted to support the explosion-proof valve body 10;
The depth of the sinking groove 203 is C, C satisfies-0.15 mm is less than or equal to J-C is less than or equal to 0.15 mm, wherein J is the thickness of the boss portion 12.
The explosion-proof valve body 10 may be provided singly or in plurality on the target side wall 21; the target sidewall 21 may be any one or more of the sidewalls of the housing body 20.
Note that, a dimension line "C" in fig. 4 shows the depth of the sink 203; the depth C of the countersink 203 cannot be too small, otherwise, the side of the explosion-proof valve body 10, which is far away from the supporting part 211 in the thickness direction, is too higher than the surface of the target side wall 21, so that on one hand, the assembly of the explosion-proof valve body 10 on the target side wall 21 is affected, the welding seam between the explosion-proof valve body 10 and the target side wall 21 is offset, the welding strength between the explosion-proof valve body 10 and the target side wall 21 is reduced, and even a hole explosion and/or air leakage phenomenon occurs, so that the welding yield of the explosion-proof valve body 10 is reduced, on the other hand, in the battery grouping process, pack (battery pack) is easily damaged on the explosion-proof valve body 10, the tightness of the explosion-proof valve body 10 is affected, battery leakage is easily caused, on the other hand, the assembly thickness of structural adhesive is reduced, the assembly precision between the battery and pack is affected, and the battery is difficult to be effectively protected in the use process, and therefore, the depth C of the countersink 203 needs to meet the requirements of J-C not less than-0.15 mm; if the depth C of the countersink 203 is too large, on one hand, the side of the explosion-proof valve body 10 far away from the supporting portion 211 in the thickness direction is lower than the surface of the target side wall 21, so that the welding seam between the explosion-proof valve body 10 and the target side wall 21 is offset, the welding strength between the explosion-proof valve body 10 and the target side wall 21 is reduced, even a hole explosion and/or air leakage phenomenon occurs, so that the welding yield of the explosion-proof valve body 10 is reduced, on the other hand, the thickness of the supporting portion 211 is too thin, the supporting portion 211 cannot effectively support the explosion-proof valve body 10, and the surface of the supporting portion 211 is easily cracked in the punching process, so that the depth C of the countersink 203 also needs to meet the requirement that J-C is less than or equal to 0.15 mm.
It should be noted that, referring to fig. 3, the target sidewall 21 forms a supporting portion 211 along one side of its thickness direction away from the explosion-proof valve body 10, and the supporting portion 211 not only can support the explosion-proof valve body 10 and ensure stability of the explosion-proof valve body 10 during welding, thereby ensuring welding yield and tightness of the explosion-proof valve body 10, but also can prevent welding slag and/or beads from falling into the accommodating cavity 201 of the housing body 20 during welding when the explosion-proof valve body 10 and the target sidewall 21 are welded due to the welding seam being located outside the housing body 20, so as to avoid damage to the electrode assembly during subsequent assembly of the welding slag and/or beads, thereby avoiding short circuit of the electrode assembly.
According to the battery shell structure provided by the embodiment, the supporting part 211 is formed on one side, far away from the explosion-proof valve body 10, of the target side wall 21 along the thickness direction of the supporting part 211, so that on one hand, the supporting part 211 can support the explosion-proof valve body 10, and the stability of the explosion-proof valve body 10 during welding is ensured, and therefore, the welding yield and the tightness of the explosion-proof valve body 10 are ensured, and on the other hand, during welding, welding slag and/or molten beads can be prevented from falling into the accommodating cavity 201 of the shell body 20 through the supporting part 211, so that the welding slag and/or molten beads are prevented from damaging a pole group during subsequent assembly, and thus the pole group short circuit is prevented; by arranging the sinking groove 203 on one side of the target side wall 21, which is close to the explosion-proof valve body 10, along the thickness direction of the target side wall 21, the depth C of the sinking groove 203 is less than or equal to 0.15 mm and less than or equal to J-C and less than or equal to 0.15 mm, wherein J is the thickness of the boss part 12, on one hand, the welding seam deviation between the explosion-proof valve body 10 and the target side wall 21 can be effectively avoided, the welding strength between the explosion-proof valve body 10 and the target side wall 21 is ensured, the phenomenon of hole explosion and/or air leakage is avoided, so that the welding yield of the explosion-proof valve body 10 is improved, the tightness between the explosion-proof valve body 10 and the target side wall 21 is ensured, on the other hand, pack (battery pack) damage to the explosion-proof valve body 10 can be avoided in the battery grouping process, battery leakage is avoided, meanwhile, the thickness of structural adhesive assembly is ensured, and the assembly precision between the battery and pack is ensured, and on the other hand, the thickness of the supporting part 211 can be ensured, so that the supporting part 211 effectively supports the explosion-proof valve body 10, and the welding yield and tightness of the explosion-proof valve body 10 are ensured; and then reduce the gas leakage risk of explosion-proof valve in the battery working process, improve the security and the reliability of battery.
In some embodiments, referring to fig. 5, the outer edge of the boss portion 12 is circumferentially provided with a first connection portion 101;
the target side wall 21 is provided with a second connection portion 212 corresponding to the first connection portion 101;
as shown in fig. 6, the first connecting portion 101 is adapted to be welded to the second connecting portion 212 to form a third connecting portion 213, the third connecting portion 213 is located on a side of the target sidewall 21 away from the accommodating cavity 201 along the thickness direction thereof, and the third connecting portion 213 is adapted to seal-connect the explosion-proof valve body 10 with the housing body 20.
In this embodiment, one side of the explosion-proof valve body 10 in the thickness direction is supported by the supporting portion 211, and then the first connecting portion 101 of the explosion-proof valve body 10 is welded with the second connecting portion 212 of the target side wall 21 to form the third connecting portion 213, so that stability of the explosion-proof valve body 10 in welding with the target side wall 21 can be ensured, welding yield and tightness of the explosion-proof valve body 10 are ensured, welding slag and/or beads can be prevented from falling into the accommodating cavity 201 of the housing body 20 during welding, and electrode groups are prevented from being damaged during subsequent assembly, so that electrode group short circuit is prevented from being caused.
In some embodiments, referring to FIG. 6, the third connecting portion 213 has a penetration B, B satisfying 0.25 mm. Ltoreq.B.ltoreq.0.8xT, where T is the thickness of the target sidewall 21.
In fig. 6, a dimension line "B" shows the penetration of the third connecting portion 213; the penetration B of the third connecting portion 213 cannot be too small, otherwise, the welding strength between the explosion-proof valve body 10 and the target side wall 21 is easily insufficient, so that air leakage occurs in the use process of the battery, and the reliability of the battery is reduced, so that the penetration B of the third connecting portion 213 needs to satisfy B being greater than or equal to 0.25 mm; if the penetration B of the third connection portion 213 is too large, on one hand, the support portion 211 is easily deformed greatly, and when the pole group is put into the case, the pole group is easily damaged, resulting in a short circuit of the pole group, and on the other hand, the support portion 211 is easily welded through, resulting in air leakage of the case body 20, and affecting the sealability of the battery, so that the penetration B of the third connection portion 213 also needs to satisfy B less than or equal to 0.8×t, where T is the thickness of the target sidewall 21.
In this embodiment, the penetration B of the third connecting portion 213 is equal to or less than 0.25 mm and equal to or less than 0.8×t, where T is the thickness of the target sidewall 21, so that on one hand, the welding strength between the explosion-proof valve body 10 and the target sidewall 21 can be ensured, and air leakage in the battery using process is avoided, thereby improving the reliability of the battery, on the other hand, the supporting portion 211 can be prevented from being deformed greatly, thereby preventing the pole group from being damaged when the pole group is put into the shell, avoiding causing a pole group short circuit, and on the other hand, the supporting portion 211 can be prevented from being welded through, the air leakage of the housing body 20 is prevented, and the tightness of the battery is ensured.
In some embodiments, referring to FIG. 4, the thickness of the supporting portion 211 is D, which satisfies 0.3 mm. Ltoreq.D < T.
In fig. 4, a dimension line "D" shows the thickness of the supporting portion 211; if the thickness of the supporting part 211 is too small, on one hand, the explosion-proof valve body 10 cannot be effectively supported, and the surface of the supporting part 211 is easily cracked in the stamping process, so that the stamping process cannot be performed, on the other hand, the supporting part 211 is easily deformed greatly in the welding process, the pole group is easily damaged when the pole group is put into a shell, the pole group is short-circuited, even the supporting part 211 is welded through, the shell body 20 leaks air, and the tightness of a battery is influenced, so that the thickness of the supporting part 211 needs to meet D more than or equal to 0.3 mm; the thickness D of the support portion 211 also satisfies d=t-C, where T is the thickness of the target sidewall 21, and C is the depth of the sink 203, and D also satisfies D < T in order to secure the depth of the sink 203.
In the embodiment, the thickness D of the supporting portion 211 satisfies 0.3 mm < D < T, so that not only can the explosion-proof valve body 10 be effectively supported, but also the surface of the supporting portion 211 can be prevented from cracking in the stamping process; meanwhile, in the welding process, the deformation of the supporting part 211 can be ensured to be in a controllable range, the electrode group is prevented from being damaged when the electrode group is put into the shell, the electrode group is prevented from being short-circuited, the supporting part 211 can be prevented from being welded through, the air leakage of the shell body 20 is avoided, and the tightness of the battery is ensured.
In some embodiments, referring to FIG. 6, the third connecting portion 213 has a width A, which is 0.5 mm. Ltoreq.A.ltoreq.7XJ.
Note that, in fig. 6, a dimension line "a" shows a melting width of the third connecting portion 213; the melting width a of the third connecting portion 213 cannot be too small, otherwise, insufficient welding strength between the explosion-proof valve body 10 and the target side wall 21 is easily caused, so that air leakage is caused in the use process of the battery, and the reliability of the battery is reduced, so that the melting width a of the third connecting portion 213 needs to meet that a is more than or equal to 0.5 mm; if the melting width a of the third connecting portion 213 is too large, the welding seam easily extends to the non-body portion (including the notch section, the notch surface and the connecting section therebetween) of the explosion-proof valve body 10 in the welding process, so that the notch shape of the explosion-proof valve body 10 is affected, the reliability of the explosion-proof valve is low, and the leakage of the explosion-proof valve is caused, therefore, the melting width a of the third connecting portion 213 also needs to satisfy a less than or equal to 7 xj, where J is the thickness of the boss portion 12.
In this embodiment, the melting width a of the third connecting portion 213 is less than or equal to 0.5 mm and less than or equal to 7×j, so that on one hand, the welding strength between the explosion-proof valve body 10 and the target side wall 21 can be ensured, air leakage in the use process of the battery is avoided, thereby improving the reliability of the battery, and on the other hand, the welding seam in the welding process can be prevented from extending to the non-body part of the explosion-proof valve body 10, thereby avoiding affecting the shape of the nick of the explosion-proof valve body 10, further improving the reliability of the explosion-proof valve, and avoiding causing air leakage of the explosion-proof valve.
In connection with table 1 below, the effect of the seal helium test between the explosion-proof valve body 10 and the housing body 20 of the battery housing structure provided by the embodiment of the invention was verified by several sets of test examples.
Under normal conditions:
as shown in table 1, example 2: the thickness T of the target side wall 21 is 1.2 mm, the thickness J of the boss part 12 is 0.5 mm, the melting width A of the third connecting part 213 is 1.021 mm, the melting depth B of the third connecting part 213 is 0.436 mm, helium test data is 2.31×10 -8Pa×m3/s, the opening pressure of the explosion-proof valve is 0.605 MPa, and after the explosion-proof valve body 10 and the target side wall 21 are welded, helium test OK; the opening pressure of the explosion-proof valve is within a set range, and the consistency of the opening pressure is high;
as shown in table 1, example 3: the thickness T of the target side wall 21 is 1.2 mm, the thickness J of the boss part 12 is 0.5 mm, the melting width A of the third connecting part 213 is 1.632 mm, the melting depth B of the third connecting part 213 is 0.611 mm, helium test data is 2.46×10 -8Pa×m3/s, the opening pressure of the explosion-proof valve is 0.612 MPa, and after the explosion-proof valve body 10 and the target side wall 21 are welded, helium test OK; the opening pressure of the explosion-proof valve is within a set range, and the consistency of the opening pressure is high;
as shown in example 4 of table 1: the thickness T of the target side wall 21 is 1.2 mm, the thickness J of the boss portion 12 is 0.5 mm, the melting width a of the third connecting portion 213 is 2.358 mm, the melting depth B of the third connecting portion 213 is 0.721 mm, the helium test data is 7.36×10 -8Pa×m3/s, the opening pressure of the explosion-proof valve is 0.622 MPa, and after the explosion-proof valve body 10 and the target side wall 21 are welded, the helium test is OK; the opening pressure of the explosion-proof valve is within a set range, and the consistency of the opening pressure is high;
as shown in example 5 of table 1: the thickness T of the target side wall 21 is 1.2 mm, the thickness J of the boss part 12 is 0.5 mm, the melting width A of the third connecting part 213 is 2.862 mm, the melting depth B of the third connecting part 213 is 0.932 mm, helium test data is 5.14X10 -8Pa×m3/s, the opening pressure of the explosion-proof valve is 0.588 MPa, and after the explosion-proof valve body 10 and the target side wall 21 are welded, helium test OK is carried out; the opening pressure of the explosion-proof valve is within a set range, and the consistency of the opening pressure is high;
as shown in example 7 of table 1: the thickness T of the target side wall 21 is 1.5mm, the thickness J of the boss part 12 is 0.4 mm, the melting width A of the third connecting part 213 is 0.756 mm, the melting depth B of the third connecting part 213 is 0.356 mm, the helium test data is 4.25X10 -8Pa×m3/s, the opening pressure of the explosion-proof valve is 0.651 MPa, and after the explosion-proof valve body 10 and the target side wall 21 are welded, the helium test OK; the opening pressure of the explosion-proof valve is within a set range, and the consistency of the opening pressure is high;
as shown in example 8 of table 1: the thickness T of the target side wall 21 is 1.5mm, the thickness J of the boss part 12 is 0.4 mm, the melting width A of the third connecting part 213 is 0.968 mm, the melting depth B of the third connecting part 213 is 0.566 mm, the helium test data is 6.58×10 -8Pa×m3/s, the opening pressure of the explosion-proof valve is 0.632 MPa, and after the explosion-proof valve body 10 and the target side wall 21 are welded, the helium test OK; the opening pressure of the explosion-proof valve is within a set range, and the consistency of the opening pressure is high;
As shown in example 9 of table 1: the thickness T of the target side wall 21 is 1.5mm, the thickness J of the boss part 12 is 0.4 mm, the melting width A of the third connecting part 213 is 1.253 mm, the melting depth B of the third connecting part 213 is 0.842 mm, the helium test data is 3.11×10 -8Pa×m3/s, the opening pressure of the explosion-proof valve is 0.644 MPa, and after the explosion-proof valve body 10 and the target side wall 21 are welded, the helium test OK is carried out; the opening pressure of the explosion-proof valve is within a set range, and the consistency of the opening pressure is high;
As shown in example 10 of table 1: the thickness T of the target side wall 21 is 2.0 mm, the thickness J of the boss part 12 is 0.6 mm, the melting width A of the third connecting part 213 is 0.753 mm, the melting depth B of the third connecting part 213 is 0.486 mm, the helium test data is 1.25X10 -8Pa×m3/s, the opening pressure of the explosion-proof valve is 0.615 MPa, and after the explosion-proof valve body 10 and the target side wall 21 are welded, the helium test OK; the opening pressure of the explosion-proof valve is within a set range, and the consistency of the opening pressure is high;
As shown in example 11 of table 1: the thickness T of the target side wall 21 is 2.0 mm, the thickness J of the boss part 12 is 0.6 mm, the melting width A of the third connecting part 213 is 0.985 mm, the melting depth B of the third connecting part 213 is 0.681 mm, helium test data is 2.96×10 -8Pa×m3/s, the opening pressure of the explosion-proof valve is 0.648 MPa, and after the explosion-proof valve body 10 and the target side wall 21 are welded, helium test OK is carried out; the opening pressure of the explosion-proof valve is within a set range, and the consistency of the opening pressure is high;
As shown in example 12 of table 1: the thickness T of the target side wall 21 is 2.0 mm, the thickness J of the boss part 12 is 0.6 mm, the melting width A of the third connecting part 213 is 1.269 mm, the melting depth B of the third connecting part 213 is 1.231 mm, the helium test data is 8.26×10 -8Pa×m3/s, the opening pressure of the explosion-proof valve is 0.599 MPa, and the helium test OK is performed after the explosion-proof valve body 10 and the target side wall 21 are welded; the opening pressure of the explosion-proof valve is within a set range, and the consistency of the opening pressure is high;
As shown in example 13 of table 1: the thickness T of the target side wall 21 is 2.5 mm, the thickness J of the boss part 12 is 0.8 mm, the melting width A of the third connecting part 213 is 0.769 mm, the melting depth B of the third connecting part 213 is 0.663 mm, the helium test data is 4.29×10 -8Pa×m3/s, the opening pressure of the explosion-proof valve is 0.634 MPa, and after the explosion-proof valve body 10 and the target side wall 21 are welded, the helium test OK is carried out; the opening pressure of the explosion-proof valve is within a set range, and the consistency of the opening pressure is high;
As shown in table 1, example 14: the thickness T of the target side wall 21 is 2.5 mm, the thickness J of the boss portion 12 is 0.8 mm, the melting width a of the third connecting portion 213 is 0.995 mm, the melting depth B of the third connecting portion 213 is 0.851 mm, the helium test data is 3.59×10 -8Pa×m3/s, the opening pressure of the explosion-proof valve is 0.629 MPa, and after the explosion-proof valve body 10 and the target side wall 21 are welded, the helium test OK; the opening pressure of the explosion-proof valve is within a set range, and the consistency of the opening pressure is high;
As shown in example 15 of table 1: the thickness T of the target side wall 21 is 2.5 mm, the thickness J of the boss part 12 is 0.8 mm, the melting width A of the third connecting part 213 is 1.325 mm, the melting depth B of the third connecting part 213 is 1.236 mm, the helium test data is 1.28x10 -8Pa×m3/s, the opening pressure of the explosion-proof valve is 0.611 MPa, and after the explosion-proof valve body 10 and the target side wall 21 are welded, the helium test OK; the opening pressure of the explosion-proof valve is within a set range, and the consistency of the opening pressure is high.
Under critical conditions:
As shown in table 1, example 1: the thickness T of the target side wall 21 is 1.2 mm, the thickness J of the boss part 12 is 0.5 mm, the melting width A of the third connecting part 213 is 0.5 mm, the melting depth B of the third connecting part 213 is 0.25 mm, the helium test data is 2.22×10 - 8Pa×m3/s, the opening pressure of the explosion-proof valve is 0.599 MPa, and the helium test OK is performed after the explosion-proof valve body 10 and the target side wall 21 are welded; the opening pressure of the explosion-proof valve is within a set range, and the consistency of the opening pressure is high;
as shown in example 6 of table 1: the thickness T of the target side wall 21 is 1.2 mm, the thickness J of the boss part 12 is 0.5 mm, the melting width A of the third connecting part 213 is 3.5 mm, the melting depth B of the third connecting part 213 is 0.96 mm, the helium test data is 3.26×10 - 8Pa×m3/s, the opening pressure of the explosion-proof valve is 0.615 MPa, and after the explosion-proof valve body 10 and the target side wall 21 are welded, the helium test is OK; the opening pressure of the explosion-proof valve is within a set range, and the consistency of the opening pressure is high.
The following are comparative examples:
As shown in table 1, comparative example 1: the thickness T of the target side wall 21 is 1.2 mm, the thickness J of the boss part 12 is 0.5 mm, the melting width A of the third connecting part 213 is 0.3 mm, the melting depth B of the third connecting part 213 is 0.1 mm, helium detection data is 1.52×10 -8Pa×m3/s, the opening pressure of the explosion-proof valve is 0.631 MPa, helium detection OK and the opening pressure meet the requirements, but the melting depth and the melting width are smaller, the welding seam fracture risk is higher in the using process, and the safety and reliability of the battery are low;
As shown in table 1, comparative example 2: the thickness T of the target side wall 21 is 1.2 mm, the thickness J of the boss part 12 is 0.5 mm, the melting width A of the third connecting part 213 is 0.5 mm, the melting depth B of the third connecting part 213 is 0.1mm, helium detection data is 1.44×10 -8Pa×m3/s, the opening pressure of the explosion-proof valve is 0.625 MPa, helium detection OK and opening pressure meet requirements, but the melting depth is smaller, the welding seam fracture risk is higher in the using process, and the safety and reliability of the battery are low;
As shown in table 1, comparative example 3: the thickness T of the target side wall 21 is 1.2 mm, the thickness J of the boss part 12 is 0.5 mm, the melting width A of the third connecting part 213 is 0.23 mm, the melting depth B of the third connecting part 213 is 0.3 mm, helium detection data is 3.01X10 - 8Pa×m3/s, the opening pressure of the explosion-proof valve is 0.599 MPa, helium detection OK, the opening pressure meets the requirements, but the melting width is smaller, the welding seam fracture risk is higher in the using process, and the safety and reliability of the battery are low;
As shown in table 1, comparative example 4: the thickness T of the target side wall 21 is 1.2 mm, the thickness J of the boss portion 12 is 0.5mm, the melting width a of the third connecting portion 213 is 4.236 mm, the melting depth B of the third connecting portion 213 is 0.719 mm, the helium detection data is 4.21×10 -8Pa×m3/s, the opening pressure of the explosion-proof valve is 0.328 MPa, after the explosion-proof valve body 10 is welded with the target side wall 21, the helium detection is OK, but the melting width is larger, and is closer to the explosion-proof valve nick, so that the explosion-proof valve nick is cracked;
As shown in table 1, comparative example 5: the thickness T of the target side wall 21 is 1.2 mm, the thickness J of the boss portion 12 is 0.5 mm, the melting width a of the third connecting portion 213 is 2.368 mm, the melting depth B of the third connecting portion 213 is 1.028 mm, the helium detection data is 4.11×10 -8Pa×m3/s, and after the explosion-proof valve body 10 and the target side wall 21 are welded, the helium detection is NG, the melting depth is large, and the case leakage is caused by the welding through the case.
TABLE 1
From this, it can be seen that the penetration B of the third connecting portion 213 satisfies 0.25 mm ++b.ltoreq.0.8xt, where T is the thickness of the target sidewall 21, and the penetration a of the third connecting portion 213 satisfies 0.5 mm.ltoreq.a.ltoreq.7xj, where J is the thickness of the boss portion 12, so that the tightness between the explosion-proof valve body 10 and the case body 20 can be effectively ensured, thereby effectively avoiding air leakage during the battery operation, and improving the safety and reliability of the battery.
In some embodiments, referring to fig. 4, the target sidewall 21 is formed with chamfers 214 on both sides in the width direction; the distance between the sinking groove 203 and the chamfer 214 is E, and E meets E not less than 1mm.
Note that, a dimension line "E" in fig. 4 shows a distance between the sink 203 and the chamfer 214; if the distance E between the countersink 203 and the chamfer 214 is too small, on one hand, the through hole 202 and the countersink 203 corresponding to the through hole 202 cannot be formed in the punching process of the housing body 20, and the housing body 20 is easy to deform, on the other hand, in the welding process of the explosion-proof valve body 10 and the housing body 20, a welding blanket is easy to cause to shield the countersink 203, so that the welding cannot be performed on the explosion-proof valve body 10, and therefore, the distance E between the countersink 203 and the chamfer 214 needs to satisfy that E is not less than 1 mm.
In this embodiment, the distance E between the countersink 203 and the chamfer 214 is greater than or equal to 1mm by satisfying E, which not only can effectively ensure that the shell body 20 forms the through hole 202 and the countersink 203 in the punching process, avoid the deformation of the shell body 20, but also can avoid the shielding of the countersink 203 by the welding blanket in the welding process, and ensure the smooth implementation of welding to the explosion-proof valve body 10.
In some embodiments, as shown in fig. 8 and fig. 9, at least a part of the area of the groove surface 13, which is close to the boss portion 12, is recessed to form a notch segment 11, and one side of the notch segment 11, which is far from the boss portion 12, is adapted to be circumferentially surrounded to form an opening surface 15;
the residual thickness of the notch section 11 is K, K is more than or equal to 0.030 mm and less than or equal to K and less than L and less than J, wherein L is the thickness of the notch surface 13.
It should be noted that, in fig. 9, a dimension line "K" shows a residual thickness of the score segment 11, where "residual thickness" refers to a residual thickness of the explosion-proof valve body 10 corresponding to a position of the score segment 11 after the score segment 11 is opened; the residual thickness K of the notch section 11 cannot be too small, otherwise, the notch surface 13 is easily opened when the explosion pressure in the battery is not reached, and the stability and the reliability of the explosion-proof valve are reduced, so that the residual thickness K of the notch section 11 is required to meet that K is more than or equal to 0.030 mm; if the residual thickness K of the notch section 11 is too large, the notch section is not easy to open and can not be timely decompressed, and the safety risk of the battery is increased, so that the residual thickness K of the notch section 11 also needs to meet K < L < J, wherein L is the thickness of the notch surface 13.
In the embodiment, the residual thickness K of the notch section 11 is smaller than or equal to K and smaller than L and smaller than J by meeting the requirement of 0.030 mm, wherein L is the thickness of the groove surface 13, so that on one hand, the stability and the reliability of the explosion-proof valve can be ensured, and on the other hand, the explosion-proof valve can be ensured to be opened and decompressed in time.
In some embodiments, as shown in fig. 8 and fig. 9, at least a portion of the recess surface 13 near the boss portion 12 is further provided with a connecting section 14, where the connecting section 14 is adapted to connect at least a portion of the opening surface 15 with the recess surface 13.
Further, the connecting section 14, the groove surface 13 and the opening surface 15 are integrally formed.
In this embodiment, the opening surface 15 is at least partially connected to the groove surface 13 through the connecting section 14, so that the whole opening surface 15 is prevented from flying out after the explosion-proof valve is opened, and short circuit is prevented.
In some embodiments, the connecting section 14 has a thickness M, M satisfying K < M.ltoreq.L.
It should be noted that, the thickness M of the connecting section 14 cannot be too small, otherwise, the connection strength between the groove surface 13 and the boss portion 12 cannot be ensured, and there is a risk that the entire groove surface 13 flies out after the explosion-proof valve is opened, so the thickness M of the connecting section 14 needs to satisfy M > K; the thickness of the connecting section 14 may be equal to the thickness of the groove face 13, and the connecting section 14 may be smaller than the thickness of the groove face 13.
In the embodiment, the thickness M of the connecting section 14 satisfies K < M.ltoreq.L, thereby ensuring the connection strength between the opening surface 15 and the groove surface 13 and effectively avoiding the whole opening surface 15 from flying out after the explosion-proof valve is opened.
According to an embodiment of the present invention, in another aspect, there is also provided a battery including: a battery body, and a battery case structure as described above.
The battery in this scheme includes foretell battery housing structure, therefore, the battery in this scheme includes the whole beneficial effect of foretell battery housing structure.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope of the invention as defined by the appended claims.
Claims (10)
1. A battery case structure, comprising:
the explosion-proof valve body comprises a groove surface and a boss part surrounding the circumferential edge of the groove surface;
The inner wall of the shell body is enclosed to form a containing cavity; the shell body comprises at least one target side wall, and one side, away from the accommodating cavity, of the target side wall along the thickness direction of the target side wall is connected with the explosion-proof valve body;
The side wall of the target is provided with a through hole; a sinking groove corresponding to the through hole is formed in one side, close to the explosion-proof valve body, of the target side wall along the thickness direction of the target side wall, and the sinking groove is suitable for accommodating the explosion-proof valve body; a support part is formed on one side of the target side wall, which is far away from the explosion-proof valve body, along the thickness direction of the target side wall, and the support part is suitable for supporting the boss part;
The depth of the sinking groove is C, C meets the condition that J-C is less than or equal to minus 0.15 and less than or equal to 0.15 and mm, wherein J is the thickness of the boss part.
2. The battery case structure according to claim 1, wherein an outer edge of the boss portion is provided with a first connecting portion in a circumferential direction;
the target side wall is provided with a second connecting part corresponding to the first connecting part;
The first connecting part is suitable for being welded with the second connecting part to form a third connecting part, the third connecting part is positioned on one side of the target side wall far away from the accommodating cavity along the thickness direction of the target side wall, and the third connecting part is suitable for being in sealing connection with the explosion-proof valve body and the shell body.
3. The battery case structure according to claim 2, wherein the penetration of the third connecting portion is B, B satisfying 0.25 mm +.b+.0.8χ, where T is the thickness of the target side wall.
4. The battery case structure according to claim 3, wherein the thickness of the support portion is D, D satisfying 0.3 mm < D < T.
5. The battery case structure according to claim 2, wherein the third connecting portion has a width of a satisfying 0.5 mm.ltoreq.a.ltoreq.7xj.
6. The battery case structure according to claim 1, wherein both sides in the width direction of the target side wall are chamfered; the distance between the sinking groove and the chamfer is E, and E meets E not less than 1mm.
7. The battery case structure according to any one of claims 1 to 6, wherein at least a partial region of the groove surface, which is close to the boss portion, is recessed to form a score segment, and a side of the score segment, which is far from the boss portion, is adapted to be circumferentially surrounded to form an opening surface;
The residual thickness of the notch section is K, K is more than or equal to 0.030 mm and less than or equal to K and less than L and less than J, wherein L is the thickness of the notch surface.
8. The battery case structure according to claim 7, wherein at least a partial region of the recess surface adjacent to the boss portion is further provided with a connecting section adapted to connect at least a portion of the opening surface with the recess surface.
9. The battery housing structure of claim 8, wherein the connecting section has a thickness M, M satisfying K < m+.l.
10. A battery, comprising: a battery body, and a battery case structure as claimed in any one of the preceding claims 1 to 9.
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| CN202410600172.6A CN118173969A (en) | 2024-05-15 | 2024-05-15 | Battery shell structure and battery |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117712612A (en) * | 2024-02-04 | 2024-03-15 | 蜂巢能源科技股份有限公司 | Battery cell |
| CN117855698A (en) * | 2024-03-07 | 2024-04-09 | 蜂巢能源科技股份有限公司 | Shell assembly and battery |
| CN117878519A (en) * | 2024-03-08 | 2024-04-12 | 蜂巢能源科技股份有限公司 | Battery core |
| CN220963656U (en) * | 2023-07-31 | 2024-05-14 | 浙江冠宇电池有限公司 | Top cap subassembly and battery |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN220963656U (en) * | 2023-07-31 | 2024-05-14 | 浙江冠宇电池有限公司 | Top cap subassembly and battery |
| CN117712612A (en) * | 2024-02-04 | 2024-03-15 | 蜂巢能源科技股份有限公司 | Battery cell |
| CN117855698A (en) * | 2024-03-07 | 2024-04-09 | 蜂巢能源科技股份有限公司 | Shell assembly and battery |
| CN117878519A (en) * | 2024-03-08 | 2024-04-12 | 蜂巢能源科技股份有限公司 | Battery core |
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