CN112379287A - Test fixture for lithium ion power battery with large length-width ratio - Google Patents
Test fixture for lithium ion power battery with large length-width ratio Download PDFInfo
- Publication number
- CN112379287A CN112379287A CN202010969024.3A CN202010969024A CN112379287A CN 112379287 A CN112379287 A CN 112379287A CN 202010969024 A CN202010969024 A CN 202010969024A CN 112379287 A CN112379287 A CN 112379287A
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- face
- battery
- power battery
- fixing groove
- panel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0028—Force sensors associated with force applying means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
Abstract
The invention discloses a test fixture for a lithium ion power battery with a large length-width ratio, which comprises an upper end panel and a lower end panel for clamping the power battery, wherein the lower end panel is provided with a lower end face battery fixing groove, the upper end panel is provided with an upper end face battery fixing groove at the position of the lower end face battery fixing groove, the extending directions of the lower end face battery fixing groove and the upper end face battery fixing groove are the same as the length extending direction of the lower end panel, both sides of the lower end panel are provided with lower end face screw holes, the upper end panel is provided with an upper end face through hole at the position corresponding to the lower end face screw hole, a bolt is arranged in the upper end face through hole, and the top surface of the upper end panel is connected with a pressure device. Meanwhile, the distance between the upper end plate and the lower end plate of the clamp is reduced, and the eccentric compression moment of the battery in the width direction is reduced.
Description
Technical Field
The invention relates to a power battery testing device, in particular to a testing clamp for a lithium ion power battery with a large length-width ratio.
Background
With the development of new energy electric vehicles, the driving mileage and safety requirements of electric vehicles are continuously increased, the single capacity of the battery is from 50Ah initially to over 200Ah at present, and in order to improve the problems of the cycle performance, the thermal management, the safety and the like of the high-capacity and high-energy density battery, the lithium ion power battery with a large length-width ratio and a long length-width ratio is produced, but the lithium ion power battery with a large length-width ratio is mechanically and unevenly pressed on the surface of the battery under the action of eccentric pressing in the width direction, so that the performance of the battery is affected, particularly, the battery is damaged due to eccentric pressing inside the battery in the charging and discharging cycle process, and even the use safety of the power battery is affected, and strict tests are required.
In a common lithium ion power battery testing clamp, clamping plates are generally respectively arranged on the upper surface and the lower surface of a battery, the battery is arranged in the middle of the clamping plates, the upper clamping plate and the lower clamping plate are fixed through bolts on two sides of the clamping plates, and the bolts are fixed through a torque wrench; the clamping fixture has the disadvantages that when the clamping fixture is used for clamping, the position of the power battery is difficult to control, and the clamped position is difficult to center; meanwhile, the position of the power battery behind the clamping plate is easy to shift, and the large-length-width ratio lithium ion power battery is easy to have the eccentric compression problem along the width direction; in addition, the traditional lithium ion power battery test fixture also has no function of monitoring the surface pressure of the battery in the battery charging and discharging process, and the eccentric compression condition cannot be represented. For example, a lithium ion polymer power battery formation clamp device disclosed in chinese patent literature, whose publication No. CN107768726A, includes a plurality of battery clamp assemblies for contacting with tabs of a lithium ion polymer power battery and a battery clamp stopper fixing assembly for guiding the tabs of the lithium ion polymer power battery, the battery clamp assembly includes a battery clamp body, a battery clamp left voltage pin, a battery clamp right current pin and a battery clamp fixing plate, one end of the battery clamp left voltage pin and one end of the battery clamp right current pin are mounting ends; however, the power battery is easy to displace during clamping, and has certain eccentric stress.
Disclosure of Invention
The invention provides a test fixture which is convenient for centering a power battery and not easy to displace so as to reduce the surface eccentricity and compression of a soft package lithium ion battery with a large length-width ratio, and aims to solve the problems that the clamping position of a power battery fixture in the prior art is difficult to center and the power battery is easy to displace after being clamped.
In order to achieve the purpose, the invention adopts the following technical scheme:
a test fixture for a lithium ion power battery with a large length-width ratio comprises an upper end panel and a lower end panel, wherein the upper end panel is used for clamping the power battery, a lower end face battery fixing groove is formed in the lower end face panel, an upper end face battery fixing groove is formed in the position of the lower end face battery fixing groove, the extending directions of the lower end face battery fixing groove and the upper end face battery fixing groove are the same as the length extending direction of the lower end panel, clamp heads used for clamping a power battery lug are arranged at two ends of the length direction of the lower end panel, lower end face screw holes are formed in two sides of the width direction of the lower end face battery fixing groove, an upper end face through hole is formed in the corresponding position of the lower end face screw hole in the upper end face panel, a bolt is arranged in the upper end face through hole, and; in the prior art, a lithium ion power battery with a large length-width ratio is clamped only by an upper panel and a lower panel, the battery is difficult to center, the power battery is also deviated in the process of clamping a rotating bolt, so that the clamped power battery is difficult to center, the power battery is always eccentrically stressed in the clamping process, and the detection result is influenced; according to the invention, the fixing grooves are formed in the lower end panel and the upper end panel, so that when the power battery is manually fixed through the bolts, the power battery can be always placed in the fixing grooves without deviation, the problem of eccentric stress is solved, meanwhile, the distance between the upper end panel and the lower end panel is reduced through the fixing grooves, the stress force distance in the width direction of the battery is reduced, and the use stability of the whole clamp is improved.
Preferably, a pressure strain gauge is arranged between the upper end panel and the lower end panel, and one end of the pressure strain gauge is connected with a data acquisition unit; during the use process of the lithium ion power battery with the large length-width ratio, the internal pressure of the battery can cause the expansion of the shell, and particularly during the charge and discharge cycle of the battery, the expansion of the shell is more obvious; and the anchor clamps of prior art can not detect the pressure on battery surface, can not the complete surface pressure change characteristic performance that measures power battery, so set up pressure strain gauge between upper end panel and lower extreme panel, measure the surface pressure of battery charge-discharge in-process for the data of test are more comprehensive.
Preferably, the guide posts are arranged on two sides of the lower end panel in the width direction, the guide post through holes are formed in the corresponding positions of the guide posts of the upper end panel, the upper fixing groove and the lower fixing groove need to be aligned in the process of clamping the power battery, the clamping difficulty is increased due to the locking bolts, the clamping efficiency is reduced, the guide posts are arranged on the lower end panel, the through holes are formed in the upper end panel, when clamping is installed, the clamping step can be completed only by aligning the guide posts with the guide through holes, and the clamping installation efficiency is improved.
Preferably, the lower side of the bolt is sleeved with a spring, the bolt needs to be disassembled in the process of using the clamp, abrasion in the installation process is caused, the abrasion between the bolt and the upper end panel can be reduced by sleeving the spring on the bolt, meanwhile, the pressing force is controllable, the pressing force on each bolt can be reduced, and the eccentric compression force is further reduced.
Preferably, the upper end panel and the lower end panel are both made of aluminum, the bottom surface of the upper end panel and the top surface of the lower end panel are both provided with insulating layers, the aluminum material is lighter than other metal materials, operation is convenient, and the aluminum battery is a conductor, so that the insulating layers are used for blocking, and safety in the detection process is ensured.
Preferably, foam is arranged between the upper end panel and the pressure strain gauge, and in the clamping process, because the upper end panel and the lower end panel are both made of hard materials, the foam simulates the actual service condition of the battery pack, so that the expansion pressure of the battery in the charging and discharging process is buffered to a certain extent.
Preferably, lower terminal surface battery fixed slot extending direction both ends all be equipped with the stopper, if set up the fixed slot into running through the groove, so at the in-process that uses, power battery can the back-and-forth movement unavoidably, influences the result of test, so set up the stopper in the both sides of fixed slot, under the prerequisite that does not influence power battery location and power battery utmost point ear centre gripping, further improve the centre gripping stability of anchor clamps.
Preferably, lower extreme face battery fixed slot and upper end face battery fixed slot body are 3 to 8 millimeters, and the groove depth of constant head tank can influence power battery's the centre gripping stability and the distance between upper end panel and the lower extreme panel, if the groove depth undersize, can make the distance between upper end panel and the lower extreme panel enlarge, and eccentric atress increases, and the while also can make power battery's fixed becoming reliable.
Preferably, one end of the clamp head, which is far away from the lower end panel, is connected with a battery current line and a battery voltage acquisition terminal, the battery is electrified through the battery current line, the voltage is measured through the battery voltage acquisition terminal, and the voltage and current sampling in the charging and discharging process is realized.
Preferably, the inner periphery of the guide post through hole is provided with a sliding sleeve matched with the guide post, the guide post can be worn in the process of being placed into the guide hole, and the sliding sleeve enables the insertion process of the guide post to be smoother.
Therefore, the invention has the following beneficial effects: (1) the lithium ion power battery with a large length-width ratio is ensured to be positioned in the centers of the upper and lower end plates of the clamp through the accurate positioning of the fixing groove, the guide post and the shaft sleeve, so that the position deviation in the clamping process is reduced; (2) the real-time monitoring and recording of the surface pressure of the lithium ion power battery with the large length-width ratio can be realized; (3) compare with traditional soft packet of lithium ion power battery anchor clamps, can reduce the battery and place the distance of back anchor clamps up-and-down end panel, reduce the battery along the ascending eccentric compression moment of width direction.
Drawings
FIG. 1 is a schematic structural diagram of a test fixture for a lithium ion power battery with a large length-to-width ratio;
FIG. 2 is a stress diagram of pressure monitoring of a prior art test fixture prior to battery charge and discharge cycles;
FIG. 3 is a stress plot of pressure monitoring of the test fixture of example 1 prior to battery charge-discharge cycling;
FIG. 4 is a stress plot of pressure monitoring of a prior art test fixture at 500 battery charge-discharge cycles at 100% SOC;
fig. 5 is a stress plot of pressure monitoring of the test fixture of example 1 at 500 battery charge-discharge cycles at 100% SOC.
1, a power battery; 2, an upper end panel; 3, a lower end panel; 4, a battery fixing groove on the lower end face; 5, a battery fixing groove is arranged on the upper end face; 6, battery tab; 7, a clamp head; 8, a screw hole is formed in the lower end face; 9, through holes are formed in the upper end face; 10, a bolt; 11, a compressive strain gauge; 12, a data collector; 13, a guide post; 14, a guide post through hole; 15, a spring; 16, soaking cotton; 17, a limiting block; 18, a battery current line; 19, a battery voltage acquisition terminal; and 20, sliding sleeves.
Detailed Description
The following further describes embodiments of the present invention by way of examples, with reference to the accompanying drawings.
Example 1
In embodiment 1 shown in fig. 1, a test fixture for a lithium ion power battery with a large length-width ratio comprises an upper end panel 2 and a lower end panel 3 for clamping the power battery 1, wherein the upper end panel and the lower end panel are both made of aluminum metal, insulating layers are respectively arranged on the bottom surface of the upper end panel and the top surface of the lower end panel, a lower end surface battery fixing groove 4 is arranged on the lower end panel, an upper end surface battery fixing groove 5 is arranged in the lower end surface battery fixing groove of the upper end panel, the depths of the lower end surface battery fixing groove and the upper end surface battery fixing groove are both 5mm, the extending directions of the lower end surface battery fixing groove and the upper end surface battery fixing groove are both the same as the length extending direction of the lower end panel, both ends of the extending direction of the lower end surface battery fixing groove are both provided with a limit block 17, and both ends of the length direction of the lower end panel are provided with, the lower end panel is provided with lower end face screw holes 8 at two sides of the width direction of the lower end face battery fixing groove, the upper end face plate is provided with an upper end face through hole 9 at the position corresponding to the lower end face screw hole, a bolt 10 is arranged in the upper end face through hole, a spring 15 is sleeved on the lower side of the bolt, guide posts 13 are arranged on two sides of the lower end panel in the width direction, the upper end panel is provided with a guide post through hole 14 at the corresponding position of the guide post, the inner periphery of the guide post through hole is provided with a sliding sleeve 20 matched with the guide post, the top surface of the upper end panel is connected with a pressure device, a pressure strain gauge 11 is arranged between the upper end panel and the lower end panel, one end of the pressure strain gauge is connected with a data acquisition unit 12, foam 16 is arranged between the upper end panel and the pressure strain gauge, and one end of the clamp head, which is far away from the lower end panel, is connected with a battery current wire 18 and a battery voltage acquisition terminal 19.
When the lithium ion power battery is used, the lithium ion power battery with the specification of 501mm in length, 94mm in width and 7.75mm in thickness is used, the foam is laid in the lower end face battery fixing groove of the lower end face plate, the length and the width of the foam are positioned in the lower end face battery positioning groove of the clamp, the groove depth of the lower end face battery positioning groove 71 is 5mm, the length is 501mm, the width is 96mm, the lithium ion power battery is flatly placed in the lower end face plate battery fixing groove of the lower end face plate with the foam, the upper surface of the power battery is sequentially laid with the pressure strain gauge and the foam, the upper end face plate is placed through the guide post through hole by using the guide post of the lower end face plate, the pressure of 5psi is applied at the upper end of the clamp by using the pressure, the bolt sequentially passes through the spring, the upper end face through hole and the lower end face screw hole from top to bottom, the bolt is screwed by using the fixed torque wrench, the power battery is electrified through a battery current line and a battery voltage acquisition terminal at one end of the clamp head, which is far away from the clamp, so that the whole clamping and installation are completed, as shown in fig. 3, an initial pressure monitoring result is obtained, then the power battery is repeatedly charged and discharged for 500 times, so that the power battery reaches 100% SOC, as shown in fig. 5, and a pressure monitoring result after charging and discharging is obtained.
As shown in fig. 2 and 4, the initial pressure monitoring result obtained after the clamping of the clamp in the prior art and the pressure monitoring result of the power battery reaching 100% SOC are shown, and as can be seen from the comparison between fig. 2 and 3, the surface pressure range of the battery in the embodiment before the charge-discharge cycle is 4-6 psi, and the battery is not obviously eccentrically pressed in the width direction; in the clamp in the prior art, the battery has obvious eccentric compression along the width direction, and the surface pressure range is 3-7 psi; as can be seen from fig. 4 and 5, when the power battery reaches 100% SOC after 500 charge-discharge cycles, the power battery in the prior art has significant eccentric compression along the width direction and has an increasing trend, and the surface pressure range of the battery is 8-45 psi; while the cell surface pressure of the jigs of the examples did not have a significant increasing or decreasing tendency in the cell width direction, the eccentric pressing was not significant in the cell width direction as compared with the comparative examples.
Claims (10)
1. A test fixture for a lithium ion power battery with a large length-width ratio comprises an upper end panel (2) and a lower end panel (3) which are used for clamping the power battery (1), and is characterized in that a lower end face battery fixing groove (4) is formed in the lower end face panel, an upper end face battery fixing groove (5) is formed in the lower end face battery fixing groove of the upper end panel, the extending directions of the lower end face battery fixing groove and the upper end face battery fixing groove are the same as the length extending direction of the lower end face panel, fixture heads (7) used for clamping tabs (6) of the power battery are arranged at two ends of the lower end face panel in the length direction, lower end face screw holes (8) are formed in two sides of the lower end face battery fixing groove in the width direction, an upper end face through hole (9) is formed in the corresponding position of the lower end face screw hole of the upper end face, the top surface of the upper end panel is connected with a pressure device.
2. The test fixture for the lithium ion power battery with the large length-width ratio as claimed in claim 1, wherein a pressure strain gauge (11) is arranged between the upper end panel and the lower end panel, and one end of the pressure strain gauge is connected with a data collector (12).
3. The test fixture for the lithium ion power battery with the large length-width ratio as claimed in claim 1, wherein guide posts (13) are arranged on two sides of the lower end panel in the width direction, and guide post through holes (14) are arranged on the upper end panel at corresponding positions of the guide posts.
4. The test fixture for the lithium ion power battery with the large length-width ratio as claimed in claim 1, wherein a spring (15) is sleeved on the lower side of the bolt.
5. The test fixture of claim 1, wherein the top and bottom end plates are made of aluminum, and the bottom surface of the top and bottom end plates are provided with an insulating layer.
6. The test fixture for the lithium ion power battery with the large length-width ratio as claimed in claim 2, wherein a foam (16) is arranged between the pressure strain gauge and the upper end panel.
7. The test fixture for the lithium ion power battery with the large length-width ratio as claimed in claim 1, wherein the two ends of the lower end face battery fixing groove in the extending direction are provided with limit blocks (17).
8. The test fixture for the lithium-ion power battery with the large length-width ratio as claimed in claim 1, wherein the depth of the lower end face battery fixing groove and the upper end face battery fixing groove are both 3 to 8 mm.
9. The test fixture for the lithium ion power battery with the large length-width ratio as claimed in claim 1, wherein a battery current line (18) and a battery voltage collecting terminal (19) are connected to one end of the fixture head far away from the lower end panel.
10. The test fixture for the lithium ion power battery with the large length-width ratio as claimed in claim 3, wherein a sliding sleeve (20) matched with the guide post is arranged on the inner periphery of the through hole of the guide post.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010969024.3A CN112379287A (en) | 2020-09-15 | 2020-09-15 | Test fixture for lithium ion power battery with large length-width ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010969024.3A CN112379287A (en) | 2020-09-15 | 2020-09-15 | Test fixture for lithium ion power battery with large length-width ratio |
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| Publication Number | Publication Date |
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| CN112379287A true CN112379287A (en) | 2021-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010969024.3A Pending CN112379287A (en) | 2020-09-15 | 2020-09-15 | Test fixture for lithium ion power battery with large length-width ratio |
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201084790Y (en) * | 2007-09-27 | 2008-07-09 | 深圳市比克电池有限公司 | Electric core fixing clamp |
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| CN103094620A (en) * | 2013-01-25 | 2013-05-08 | 河南环宇赛尔新能源科技有限公司 | Soft package lithium ion battery formation clamp |
| CN203779368U (en) * | 2014-01-24 | 2014-08-20 | 骆国宾 | Fan rib processing jig |
| CN104535416A (en) * | 2014-12-22 | 2015-04-22 | 北京工业大学 | Local temperature-rise sheet buckling test fixture and experimental method |
| CN207124249U (en) * | 2017-07-17 | 2018-03-20 | 深圳市卓誉自动化科技有限公司 | A kind of electrical core of power battery fixture |
| CN209329080U (en) * | 2018-12-28 | 2019-08-30 | 蜂巢能源科技有限公司 | Vehicular battery thickness measuring fixture |
| CN110220771A (en) * | 2019-07-15 | 2019-09-10 | 福州大学 | A kind of double-pole hinged-support suitable for pressurized tests |
| CN209525366U (en) * | 2018-11-23 | 2019-10-22 | 芜湖天弋能源科技有限公司 | A kind of battery core fixture |
| CN110988718A (en) * | 2019-12-20 | 2020-04-10 | 荣盛盟固利新能源科技有限公司 | Test system and method for measuring expansion stress of lithium ion battery |
| CN210346757U (en) * | 2019-08-05 | 2020-04-17 | 桑顿新能源科技(长沙)有限公司 | Power battery cell and module expansion testing device |
| CN211103629U (en) * | 2019-12-13 | 2020-07-28 | 安普瑞斯（南京）有限公司 | Secondary battery's anchor clamps |
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2020
- 2020-09-15 CN CN202010969024.3A patent/CN112379287A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201084790Y (en) * | 2007-09-27 | 2008-07-09 | 深圳市比克电池有限公司 | Electric core fixing clamp |
| CN201378613Y (en) * | 2009-02-27 | 2010-01-06 | 西安瑟福能源科技有限公司 | End product shaping jig for polymer lithium ion batteries |
| CN103094620A (en) * | 2013-01-25 | 2013-05-08 | 河南环宇赛尔新能源科技有限公司 | Soft package lithium ion battery formation clamp |
| CN203779368U (en) * | 2014-01-24 | 2014-08-20 | 骆国宾 | Fan rib processing jig |
| CN104535416A (en) * | 2014-12-22 | 2015-04-22 | 北京工业大学 | Local temperature-rise sheet buckling test fixture and experimental method |
| CN207124249U (en) * | 2017-07-17 | 2018-03-20 | 深圳市卓誉自动化科技有限公司 | A kind of electrical core of power battery fixture |
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| CN209329080U (en) * | 2018-12-28 | 2019-08-30 | 蜂巢能源科技有限公司 | Vehicular battery thickness measuring fixture |
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| CN211103629U (en) * | 2019-12-13 | 2020-07-28 | 安普瑞斯（南京）有限公司 | Secondary battery's anchor clamps |
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Effective date of registration: 20211111 Address after: 311215 No. 855, Jianshe Second Road, economic and Technological Development Zone, Xiaoshan District, Hangzhou City, Zhejiang Province Applicant after: Wanxiang 123 Co., Ltd Address before: 311215 No. 855, Jianshe Second Road, Xiaoshan Economic and Technological Development Zone, Xiaoshan District, Hangzhou City, Zhejiang Province Applicant before: Wanxiang 123 Co., Ltd Applicant before: Wanxiang Group Co., Ltd |