Container formation charging process for power storage battery and power storage battery

Abstract

The invention provides a power storage battery container formation charging process and a power storage battery. The process comprises the following steps: continuously pre-charging the storage battery; alternately discharging and charging the storage battery for multiple times; standing the storage battery; and the storage battery is charged after being discharged. According to the present invention, the standing operation is added during the internal formation charging and discharging process, and the standing is set after the multiple alternate discharging and charging, such that the cycle life of the storage battery is prolonged to a certain extent while the internal formation time is not significantly increased.

Description

Technical Field

[0001] The invention belongs to the technical field of storage batteries, and in particular relates to a power storage battery internal formation charging process and a power storage battery. Background Art

[0002] Lead-acid batteries have the advantages of good charging and discharging performance, safety and stability, and low price. They are currently widely used in electric bicycles, electric tricycles, electric vehicles, etc. Lead-acid batteries are widely used. The traditional battery charging process takes about 3-4 days to manufacture. Therefore, shortening the battery formation time and improving the battery production efficiency are also one of the main research directions of lead-acid batteries.

[0003] The existing technology has currently shortened the internal formation time of batteries to about 2 days by optimizing the internal formation process.

[0004] For example, Chinese patent application document CN110911727B records a low-energy charging process for batteries, in which a 47-hour internal formation process is achieved by adopting a twenty-eight-step operation; for example, Chinese patent application document CN112803082A records a high-efficiency and energy-saving internal formation charging method for power batteries, which also achieves a 45-hour internal formation of batteries.

[0005] Although the parameters and operations of the internal formation process in the prior art are specifically different, the idea of ​​internal formation generally conforms to low current pre-charging and high current multiple discharge and charge. So far, it is difficult to break through the internal formation time of the battery. Summary of the invention

[0006] In view of the above technical problems, the present application proposes a power battery internal formation charging process and a power battery. The specific technical solutions are as follows:

[0007] A power storage battery internal formation charging process and a power storage battery, the process comprising:

[0008] Continuously pre-charge the battery;

[0009] Discharge and charge the battery alternately multiple times;

[0010] Let the battery sit;

[0011] Discharge the battery and then recharge it.

[0012] Preferably, the battery is left standing for no more than 0.5 h.

[0013] Preferably, when the storage battery is discharged and charged alternately for multiple times, the discharge current remains unchanged each time, and the discharge time gradually increases, and the charge current remains unchanged each time, and the charge time gradually decreases.

[0014] Preferably, the charging current used during pre-charging gradually increases, and the charging time gradually increases.

[0015] Preferably, a charging operation is performed before the battery is left to rest.

[0016] Preferably, after the battery has been left to rest, when the battery is discharged, a constant discharge current is used, but two different voltage conditions are used.

[0017] Preferably, after the storage battery has been left to rest, when the storage battery is charged, the current used is gradually reduced, and acid is extracted during the last charge.

[0018] The present application also provides a power storage battery, which is obtained by internalizing the power storage battery through the internalization process described above.

[0019] The beneficial effects of the present invention are as follows: the present application adds a resting operation during the internalization charging and discharging process, and sets the resting operation after multiple alternating discharge and charging, which improves the cycle life of the battery to a certain extent without significantly increasing the internalization time. DETAILED DESCRIPTION

[0020] In the following description, certain specific details are set forth in order to provide a thorough understanding of various embodiments. However, it will be appreciated by those skilled in the art that the present invention may be practiced without these details. In other cases, well-known structures are not shown or described in detail to avoid unnecessarily obscuring the description of the embodiments. Unless the context otherwise requires, throughout the specification and the appended claims, the word "comprising" shall be interpreted in an open, inclusive sense, i.e., as "including but not limited to".

[0021] "One embodiment" or "embodiment" mentioned throughout this specification means that in at least one embodiment, specific features, structures or characteristics related to the embodiment are included. Therefore, the phrases "in one embodiment" or "in an embodiment" appearing in various places throughout this specification do not necessarily all refer to the same embodiment. In addition, specific features, structures or characteristics can be combined in any suitable manner in one or more embodiments. In addition, as used in this specification and the appended claims, the singular forms "one / kind" and "the" include plural indicators unless the context clearly dictates otherwise. It should also be noted that the term "or" is generally used in its meaning that includes "and / or" unless the context clearly dictates otherwise.

[0022] This application describes a power battery internal formation charging process and a power battery, the process is:

[0023] Continuously pre-charge the battery;

[0024] Discharge and charge the battery alternately multiple times;

[0025] Let the battery sit;

[0026] Discharge the battery and then recharge it.

[0027] In the above process, it should be noted that acid injection should also be performed before pre-charging, and the charging current range used in pre-charging gradually increases, and the charging time gradually increases.

[0028] When the battery is discharged and charged alternately for multiple times, the discharge current remains unchanged each time, and the discharge time gradually increases; the charge current remains unchanged each time, and the charge time gradually decreases.

[0029] Before the battery is left to rest, a charging operation is performed.

[0030] After the battery has been at rest, when the battery is discharged, a constant discharge current is used, but two different voltage conditions are used.

[0031] After the battery has been at rest, the current used when charging the battery is gradually reduced, and acid is extracted during the last charge.

[0032] When the battery is left standing during internal formation, the internal chemical reaction can be stabilized, but standing still will prolong the internal formation time. Therefore, even if standing still is set in the prior art, it is executed after the main internal formation program is completed to minimize the time extended by the standing still operation.

[0033] The applicant has found that placing the static operation at a certain point in the middle of the internal formation process will not only not significantly extend the internal formation time, but more importantly, it will have an unexpected effect of improving the cycle life of the battery.

[0034] In the following embodiments and comparative examples, the battery used for the internal formation process is a power valve-regulated battery with a rating of 20 Ah.

[0035] Example 1

[0036] The internalization process used in this embodiment is:

[0037] Step 1: Charging, charging current 1A, time 0.25h;

[0038] Step 2: Charging, charging current 3A, time 0.25h;

[0039] Step 3: Charging, charging current 4.6A, time 3h;

[0040] Step 4: Charging, charging current 6.3A, time 8h;

[0041] Step 5: Discharge, discharge current 10A, time 0.25h;

[0042] Step 6: Charging, charging current 6.4A, time 6.7h;

[0043] Step 7: Discharge, discharge current 10A, time 0.25h;

[0044] Step 8: Charging, charging current 6.4A, time 5.5h;

[0045] Step 9: Discharge, discharge current 10A, time 0.5h;

[0046] Step 10: Charging, charging current 6.4A, time 5h;

[0047] Step 11: Discharge, discharge current 10A, time 1h;

[0048] Step 12: Charging, charging current 6.4A, time 4h;

[0049] Step 13: Charging, charging current 5A, time 1h;

[0050] Step 14: Let stand for 0.25h;

[0051] Step 15: Discharge, discharge current 10A, time 1.67h;

[0052] Step 16: Discharge, discharge current 10A, time 1h, and load 9V voltage;

[0053] Step 17: Charging, charging current 6.5A, time 3h;

[0054] Step 18: Charging, charging current 5A, time 1h;

[0055] Step 19: Charging, charging current 3.5A, time 0.5h;

[0056] Step 20: Charging, charging current 0.5A, time 2h;

[0057] Step 21: Charging, charging current 0.5A, time 1h.

[0058] Example 2

[0059] This embodiment is different from Embodiment 1 in that the standing time in step 14 is 0.5 h.

[0060] Example 3

[0061] This embodiment is different from Embodiment 1 in that the standing time in step 14 is 1 hour.

[0062] Comparative Example 1

[0063] This embodiment is different from Embodiment 1 in that the static operation of step 14 is not performed.

[0064] Comparative Example 2

[0065] The difference between this embodiment and embodiment 1 is that the standing operation of step 14 is adjusted to after step 4 and before step 5, and the standing time is 0.25h.

[0066] Comparative Example 3

[0067] This embodiment is different from Embodiment 1 in that the standing operation in step 14 is adjusted to after step 21, and the standing time is 0.25 h.

[0068] The batteries of Examples 1 to 3 and Comparative Examples 1 and 2 were subjected to a 45° C. 60% DOD cycle life test. The results are shown in Table 1.

[0069]

[0070] Table 1

[0071] It can be seen that, compared with Comparative Example 1 in which the standing process is not set, the setting of the standing process in Example 1 has a significant effect on improving the battery cycle life; in addition, by comparing Example 1, Comparative Example 2 and Comparative Example 3, it can be seen that the process setting of the standing operation also has an impact on the improvement effect of the battery cycle life after the battery is internalized, and it can be clearly seen that the standing process is not the best when it is set after the internalization is completed, but it has a better effect when it is set after multiple charging and discharging; from the comparison between Examples 1 to 3, it can be seen that extending the standing time has a certain helpful effect on the improvement effect of the battery cycle life, but it will also extend the internalization time, and the effect of extending the standing time on the improvement effect of the battery cycle life is not significant.

[0072] In Example 1, it should be pointed out that the emphasized process feature is that after pre-charging and before standing, the battery is subjected to multiple alternating discharge and charge cycles, each time the discharge current remains unchanged, the discharge time gradually increases, each time the charging current remains unchanged, and the charging time gradually decreases. In fact, the inventors found that in this process, multiple alternating discharge and charge operations will affect the effect of internalization.

[0073] Example 4

[0074] This embodiment is different from Embodiment 1 in that the time conditions of steps 5 to 12 are adjusted as follows:

[0075] Step 5: Discharge, discharge current 10A, time 0.5h;

[0076] Step 6: Charging, charging current 6.4A, time 5.3h;

[0077] Step 7: Discharge, discharge current 10A, time 0.5h;

[0078] Step 8: Charging, charging current 6.4A, time 5.3h;

[0079] Step 9: Discharge, discharge current 10A, time 0.5h;

[0080] Step 10: Charging, charging current 6.4A, time 5.3h;

[0081] Step 11: Discharge, discharge current 10A, time 0.5h;

[0082] Step 12: Charging, charging current 6.4A, time 5.3h.

[0083] Example 5

[0084] This embodiment is different from Embodiment 1 in that the time conditions of steps 5 to 12 are adjusted as follows:

[0085] Step 5: Discharge, discharge current 10A, time 1h;

[0086] Step 6: Charging, charging current 6.4A, time 6.7h;

[0087] Step 7: Discharge, discharge current 10A, time 0.5h;

[0088] Step 8: Charging, charging current 6.4A, time 5.5h;

[0089] Step 9: Discharge, discharge current 10A, time 0.25h;

[0090] Step 10: Charging, charging current 6.4A, time 5h;

[0091] Step 11: Discharge, discharge current 10A, time 0.25h;

[0092] Step 12: Charge, charging current 6.4A, time 4h.

[0093] Example 6

[0094] This embodiment is different from Embodiment 1 in that the time conditions of steps 5 to 12 are adjusted as follows:

[0095] Step 5: Discharge, discharge current 10A, time 0.25h;

[0096] Step 6: Charging, charging current 6.4A, time 4h;

[0097] Step 7: Discharge, discharge current 10A, time 0.25h;

[0098] Step 8: Charging, charging current 6.4A, time 5h;

[0099] Step 9: Discharge, discharge current 10A, time 0.5h;

[0100] Step 10: Charging, charging current 6.4A, time 5.5h;

[0101] Step 11: Discharge, discharge current 10A, time 1h;

[0102] Step 12: Charging, charging current 6.4A, time 6.7h.

[0103] The batteries of Examples 4 to 6 after internalization were subjected to a 45°C 60% DOD cycle life test. The results are shown in Table 2.

[0104]

[0105] Table 2

[0106] By comparing Example 1 with Examples 4 to 6, it can be seen that when the battery is discharged and charged alternately for multiple times, the discharge current remains unchanged each time, the discharge time gradually increases, and the charging current remains unchanged each time, the charging time gradually decreases, which is more conducive to improving the cycle life of the battery after internalization.

[0107] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them.

Claims

1. A power battery internal formation charging process and a power battery, characterized in that: The process comprises: Continuously pre-charge the battery; Discharge and charge the battery alternately multiple times; Let the battery sit; Discharge the battery and then recharge it.

2. A power battery internal formation charging process and a power battery according to claim 1, characterized in that: The battery should not be left standing for more than 0.5h.

3. A power battery internal formation charging process and a power battery according to claim 1, characterized in that: When the battery is discharged and charged alternately for multiple times, the discharge current remains unchanged each time, and the discharge time gradually increases; the charge current remains unchanged each time, and the charge time gradually decreases.

4. A power storage battery internal formation charging process and a power storage battery according to claim 1, characterized in that: The charging current used during pre-charging gradually increases, and the charging time gradually increases.

5. A power battery internal formation charging process and a power battery according to claim 1, characterized in that: Before the battery is left to rest, a charging operation is performed.

6. A power storage battery internal formation charging process and a power storage battery according to claim 1, characterized in that: After the battery has been at rest, when the battery is discharged, a constant discharge current is used, but two different voltage conditions are used.

7. A power storage battery internal formation charging process and a power storage battery according to claim 1, characterized in that: After the battery has been at rest, the current used when charging the battery is gradually reduced, and acid is extracted during the last charge.

8. A power battery, characterized in that: The power storage battery is obtained by internal formation using the internal formation charging process described in any one of claims 1 to 7.

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