Shell for power battery and power battery
By designing grooves and scoring grooves on the power battery casing to form a liquid replenishment valve, the problem of the power battery being unable to be replenished with liquid a second time is solved, improving the high-rate charge and discharge performance and extending battery life.
Patent Information
- Application Number
- CN202422901153.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2034-11-26
AI Technical Summary
Existing power batteries only have one electrolyte injection hole, which cannot achieve secondary electrolyte replenishment, resulting in severe electrolyte loss and affecting high-rate charge and discharge performance and cycle life.
A groove is designed on the power battery casing to form a thinned connecting piece, and a groove is scored on the connecting piece to form a liquid replenishment valve. The liquid replenishment valve is pushed open through the groove for secondary liquid replenishment.
It enables secondary electrolyte replenishment of the power battery, improves high-rate charge and discharge performance, extends battery cycle life, and avoids the risk of the electrolyte valve falling into the battery.
Smart Images
Figure CN223809166U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to power battery technical field especially relates to a shell for power battery and power battery. BACKGROUND
[0002] At present, lithium ion / sodium ion power battery gradually becomes new energy industry mainstream product because of high energy density, good capacity consistency, can support big ratio charge and discharge and other advantages.
[0003] Because power battery only has one liquid injection hole, adopts aluminum peg etc. Permanent package after liquid injection production is completed, cannot carry out secondary liquid supplement operation.
[0004] Power battery big ratio charge and discharge is accompanied by greater electrolyte loss, and the stable cycle life of battery in later period all require that it has sufficient electrolyte in the inside, therefore, power battery realizes secondary liquid supplement is a new demand. UTILITY MODEL CONTENTS
[0005] The utility model discloses a shell for power battery and power battery, can realize the secondary liquid supplement of power battery, and then improve the big ratio charge and discharge performance of power battery in later period, prolong the cycle life of power battery.
[0006] In order to realize the above-mentioned purpose, the utility model provides a shell for power battery, the shell is provided with a recess in a position, by the formation of the recess, the shell forms the connecting piece of being reduced in the position, the connecting piece is formed with the non-closed score groove, by the formation of the score groove, the connecting piece forms the liquid supplement valve, the liquid supplement valve can be pushed away along the score groove to carry out secondary liquid supplement.
[0007] Optionally, the score groove is C-shaped, and the included angle of the score groove is between 275° and 340°.
[0008] Optionally, the thickness of the liquid supplement valve is between 0.10mm and 0.50mm.
[0009] Optionally, the recess is formed on the outside of the liquid supplement valve.
[0010] Optionally, the recess is circular, and the diameter of the recess is between 0.5mm and 5mm.
[0011] Optionally, the upper end of the recess expands outward to form an annular groove, and the bottom wall of the annular groove forms a stepped surface.
[0012] Optionally, the shell is further provided with a primary liquid injection hole.
[0013] Optionally, the shell is a cover body; or
[0014] The shell is a main shell, and the recess and the connecting piece are formed with a shell bottom.
[0015] To achieve the above-mentioned purpose, the utility model also provides a power battery, including the shell for power battery as mentioned in the preceding.
[0016] Optionally, the power battery includes a winding core and a current collector plate welded at an end of the winding core, the liquid supplement valve faces the current collector plate, and a through hole is formed on the current collector plate close to the liquid supplement valve.
[0017] In the embodiment of the utility model, the liquid supplement valve is formed on the shell, when the internal electrolyte is seriously consumed due to long-term circulation of the power battery, the liquid supplement valve can be pushed open along the notch groove (i.e. from the closed connection state with the main body of the shell to the open state), and then liquid supplement operation can be performed, so that the large-rate charge-discharge performance of the power battery in the middle and late stages can be improved, the cycle life of the power battery is prolonged, and the safety problem caused by the inability to supplement liquid is avoided. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 is a three-dimensional structure schematic view of the shell for the power battery in the embodiment of the utility model.
[0019] Figure 2 is Figure 1 an enlarged view of A part in
[0020] Figure 3 is a cross-sectional structure schematic view of the shell for the power battery in the embodiment of the utility model.
[0021] Figure 4 is Figure 3 an enlarged view of B part in
[0022] Figure 5 is a bottom view structure schematic view of the shell for the power battery in the embodiment of the utility model.
[0023] Figure 6 is Figure 5 an enlarged view of C part in
[0024] Figure 7 is a cross-sectional schematic view of a local structure of the shell for the power battery in the embodiment of the utility model.
[0025] Figure 8 is a cross-sectional structure schematic view of the power battery in the embodiment of the utility model.
[0026] Figure 9 is Figure 8 Enlarged view of D portion in FIG. DETAILED DESCRIPTION
[0027] In order to make the technical content, structural features and implementation effects of the utility model more apparent, clear and understandable, the specific embodiments of the utility model will be described in detail below with reference to the drawings.
[0028] In order to make the technical content, structural features and implementation effects of the utility model more apparent, clear and understandable, the specific embodiments of the utility model will be described in detail below with reference to the drawings. In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.
[0029] Please refer to Figures 1 to 9 The utility model discloses an embodiment discloses a kind of shell 1 for power battery, recess 10 is opened in the position of shell 1, by the formation of recess 10, shell 1 is formed in the position reduced connecting piece 11, un-closed score groove 12 is formed on connecting piece 11, by the formation of score groove 12, connecting piece 11 forms liquid supplement valve 13, liquid supplement valve 13 can be pushed open along score groove 12 to carry out secondary liquid supplement.
[0030] In the embodiment of the utility model, liquid supplement valve 13 is formed on shell 1, when power battery long-term cycle makes internal electrolyte serious loss, liquid supplement valve 13 can be pushed open along score groove 12 (i.e. from the closed connection state of shell main body changes to open state), and then liquid supplement operation can be carried out, so that the large rate charge-discharge performance of power battery in later period can be improved, power battery cycle life is prolonged, and the safety problem brought by unable to carry out liquid supplement is avoided.And, since score groove 12 is not closed, when liquid supplement valve 13 is pushed open along score groove 12, liquid supplement valve 13 is still partially connected with shell main body, so that it is ensured that liquid supplement valve 13 will not fall into power battery interior.
[0031] In the embodiment of the utility model, when liquid supplement valve 13 needs to be pushed open, special clamp can be used to push liquid supplement valve 13.
[0032] In some embodiments, score groove 12 is C-shaped. Of course, score groove 12 is not limited to C-shaped, as long as based on the setting of score groove 12, liquid supplement valve 13 can be smoothly pushed open.
[0033] Specifically, the included angle of the notch groove 12 is between 275° and 340°. By setting the included angle of the notch groove 12 to be between 275° and 340°, the liquid supplement valve 13 can be pushed open by a sufficient angle, thereby facilitating liquid supplement, and at the same time, the liquid supplement valve 13 can be reliably connected to the main body of the shell when pushed open. Of course, the included angle of the notch groove 12 is not limited to be between 275° and 340°.
[0034] In some embodiments, the notch groove 12 is formed on the inner wall of the liquid supplement valve 13. Of course, the notch groove 12 is not limited to be formed on the inner wall of the liquid supplement valve 13, and it is not excluded that the notch groove 12 is formed on the outer wall of the liquid supplement valve 13 or on both the inner wall and the outer wall of the liquid supplement valve 13.
[0035] In order to facilitate being pushed open, the thickness T of the liquid supplement valve 13 is set to be much smaller than the wall thickness of the shell 1. In some embodiments, the thickness T of the liquid supplement valve 13 is between 0.10 mm and 0.50 mm. Of course, it is not limited to this.
[0036] In some embodiments, the recess 10 is formed on the outer side of the liquid supplement valve 13. That is, by machining the recess 10 on the outer wall of the shell 1, the inner side of the recess 10 can form the connecting piece 11, and the notch groove 12 machined on the connecting piece 11 forms the liquid supplement valve 13. Of course, the recess 10 is not limited to be formed on the outer side of the liquid supplement valve 13, and it is not excluded that the recess 10 can be formed on the inner side of the liquid supplement valve 13, or the inner and outer sides of the liquid supplement valve 13 are both formed with the recess 10.
[0037] Specifically, the recess 10 is circular, and the diameter W of the recess 10 is between 0.5 mm and 5 mm. Of course, the recess 10 is not limited to be circular.
[0038] More specifically, the diameter W of the recess 10 is between 0.75 mm and 2.5 mm.
[0039] Specifically, the upper end of the recess 10 is expanded outwardly to form an annular groove 14, and the bottom wall of the annular groove 14 forms a stepped surface 15. By forming the stepped surface 15, after the liquid supplement is completed, laser welding sealing pins can be performed, or permanent packaging can be performed by steel ball peening / UV glue coating, etc.
[0040] In some embodiments, the shell 1 is further provided with a one-time liquid injection hole 16. When the main body structure of the power battery is assembled, the one-time liquid injection hole 16 is open, and the initial liquid injection is performed through the one-time liquid injection hole 16. When the power battery is completed by the one-time liquid injection hole 16, permanent sealing can be performed by welding aluminum nails / steel nails, etc. When subsequent secondary liquid supplement is needed, the originally sealed liquid supplement valve 13 is pushed open for liquid supplement operation.
[0041] In some embodiments, the housing 1 is a main housing 1, which includes a side wall 17 and a bottom 18 connected to one end of the side wall 17. The groove 10 and the connecting piece 11 form the bottom 18. Of course, when the housing 1 is the main housing 1, the groove 10 and the connecting piece 11 are not limited to forming the bottom 18, and may be provided on the side wall 17.
[0042] Specifically, the bottom of the shell 18 also has a primary injection hole 16.
[0043] In other embodiments, the housing 1 is a cover (not shown), i.e., the groove 10 and the connecting piece 11 are formed on the cover.
[0044] In some embodiments, the housing 1 may be made of metal such as aluminum or steel. The replenishing valve 13 may be formed by integral stamping / stretching.
[0045] Please combine Figures 1 to 9 This utility model embodiment also discloses a power battery, including the casing 1 for the power battery as described above.
[0046] In this embodiment of the invention, a replenishing valve 13 is formed on the housing 1. When the electrolyte inside the power battery is severely depleted due to long-term cycling, the replenishing valve 13 can be pushed open along the groove 12, thereby enabling electrolyte replenishment. This improves the high-rate charge-discharge performance of the power battery in the later stages, extends the cycle life of the power battery, and avoids the safety problems caused by the inability to replenish electrolyte. Moreover, since the groove 12 is not closed, when the replenishing valve 13 is pushed open along the groove 12, the replenishing valve 13 is still partially connected to the housing body, ensuring that the replenishing valve 13 will not fall into the power battery.
[0047] In some embodiments, the power battery includes a core 2 and a collector plate 3 welded to the end of the core 2. A replenishing valve 13 faces the collector plate 3, and a through hole 31 is formed on the collector plate 3 near the replenishing valve 13. Since the through hole 31 is formed on the collector plate 3 near the replenishing valve 13, when the replenishing valve 13 is pushed open for replenishment, the through hole 31 can form a channel for the replenished electrolyte to flow inward.
[0048] The above-disclosed examples are merely preferred embodiments of the present utility model, intended to facilitate understanding and implementation by those skilled in the art. They should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model are still within the scope of the present utility model.
Claims
1. A housing for a power cell, characterized in that A recess is formed at a position of the shell, by the recess, the shell is formed with a thinned connecting piece at the position, the connecting piece is formed with an unclosed score groove, by the score groove, the connecting piece is formed with a liquid supplement valve, the liquid supplement valve can be pushed open along the score groove to perform secondary liquid supplement.
2. The housing for a power cell of claim 1, wherein, The score groove is in a C shape, and an included angle of the score groove is between 275° and 340°.
3. The housing for a power cell of claim 1, wherein, The thickness of the liquid supplement valve is between 0.10 mm and 0.50 mm.
4. The housing for a power cell of claim 1, wherein, The recess is formed on the outside of the liquid supplement valve.
5. The housing for a power cell of claim 4, wherein, The recess is in a circular shape, and a diameter of the recess is between 0.5 mm and 5 mm.
6. The housing for a power cell of claim 4, wherein, An upper end of the recess is expanded outward to form an annular groove, and a bottom wall of the annular groove forms a stepped surface.
7. The housing for a power cell of claim 1, wherein, The shell is further provided with a primary liquid injection hole.
8. The shell for a power battery according to claim 1, wherein, The shell is a cover body; or The shell is a main shell, and the recess and the connecting piece are formed with a shell bottom.
9. A power cell, characterized by A shell for a power battery according to any one of claims 1 to 8.
10. The power cell of claim 9, wherein, The power battery comprises a winding core and a current collector plate welded at an end of the winding core, the liquid supplement valve faces the current collector plate, and the current collector plate is formed with a through hole close to the liquid supplement valve.