Battery production system and battery production method

Abstract

The present application discloses a battery production system and a battery production method. The battery production system comprises a charging and discharging apparatus and a battery, wherein the charging and discharging apparatus is used for charging and discharging the battery, and the charging and discharging apparatus comprises an apparatus body, a charging and discharging positive electrode, a charging and discharging negative electrode, a voltage maintaining device and a conductive contact member; the voltage maintaining device is used for maintaining a voltage difference between the charging and discharging negative electrode and the conductive contact member, such that the voltage difference between the charging and discharging negative electrode and the conductive contact member is greater than a first preset voltage, wherein the first preset voltage is 0.8 V; the battery comprises a battery cell and a housing, wherein the battery cell is provided with a battery positive electrode and a battery negative electrode, the battery cell is arranged in the housing, and the battery positive electrode and the battery negative electrode both penetrate out of the housing; and the charging and discharging positive electrode is configured to be electrically conducted with the battery positive electrode, the charging and discharging negative electrode is configured to be electrically conducted with the battery negative electrode, and the conductive contact member is configured to be electrically conducted with the housing. By means of the above solution, the effect that the corrosion resistance effect of the housing of the battery is good, and the safety performance of a battery pack can be improved is achieved.

Description

Battery production system and battery production method

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 15, 2023, with application number 202311525840.5 and invention name “A Battery Production System and Battery Production Method”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of batteries, and in particular to a battery production system and a battery production method. Background Art

[0003] At present, the structure of lithium-ion batteries is mainly composed of a shell, an insulating structure, a battery positive electrode, a battery negative electrode, a diaphragm, an electrolyte and other structures. The battery positive electrode and the battery negative electrode serve as output ports for external current. The battery positive electrode and the battery negative electrode are separated by a diaphragm and other insulating structures to play a role of relative insulation.

[0004] The shell is usually made of aluminum. When the aluminum shell is insulated from both the positive and negative electrodes of the battery, the shell is immersed in the electrolyte for a long time and is prone to corrosion. Only when there is a certain potential difference between the aluminum shell and the negative electrode of the battery can the surface of the aluminum shell maintain a dense oxide layer structure and play a role in corrosion resistance. Therefore, most products on the market choose to use a conductive design between the aluminum shell and the positive electrode of the battery to maintain a dense oxide layer on the surface of the aluminum shell.

[0005] However, the design of the aluminum shell and the battery's positive electrode being conductive will cause all aluminum shells to maintain the same potential as the battery's positive electrode. When multiple batteries are assembled into a battery pack, there will be a certain potential difference between adjacent aluminum shells. When the insulation between the shells fails, the shells will be connected to each other, which will generate current, resulting in local heat generation and the risk of igniting the battery pack. Therefore, from a safety perspective, the aluminum shell is completely insulated from both the positive and negative electrodes of the battery and does not carry any potential itself, making it a safe design. However, the aluminum shell is completely insulated from the positive electrode of the battery. If the production process is not properly controlled, there is a certain probability that the voltage between the aluminum shell and the negative electrode of the battery will be too low, causing the oxide layer on the surface of the aluminum shell to be reduced, and the aluminum shell is prone to corrosion.

[0006] Summary of the Invention

[0007] The present application provides a battery production system and a battery production method to achieve better corrosion resistance of the battery shell and improve the safety performance of the battery pack.

[0008] According to one aspect of the present application, a battery production system is provided, which includes a charging and discharging device and a battery, the charging and discharging device is used to charge and discharge the battery, the charging and discharging device includes an equipment body, a charging and discharging positive electrode, a charging and discharging negative electrode, a voltage maintaining device and a conductive contact; the charging and discharging positive electrode, the charging and discharging negative electrode, the voltage maintaining device and the conductive contact are all arranged on the equipment body; the voltage maintaining device is used to maintain the voltage difference between the charging and discharging negative electrode and the conductive contact, so that the voltage difference between the charging and discharging negative electrode and the conductive contact is greater than a first preset voltage, wherein the first preset voltage is 0.8V; the battery includes a battery cell and a shell, the battery cell has a battery positive electrode and a battery negative electrode, the battery cell is arranged in the shell and the battery positive electrode and the battery negative electrode both pass through the shell; the charging and discharging positive electrode is used to electrically conduct with the battery positive electrode, the charging and discharging negative electrode is used to electrically conduct with the battery negative electrode, and the conductive contact is used to electrically conduct with the shell.

[0009] In an optional embodiment of the present application, the voltage maintaining device is electrically connected between the charge and discharge negative electrode and the conductive contact, and is used to make the voltage difference between the charge and discharge negative electrode and the conductive contact greater than a first preset voltage.

[0010] In an optional embodiment of the present application, the charging and discharging equipment also includes an auxiliary device, which is used to indirectly contact and conduct with the shell; the voltage maintaining device is electrically connected between the charging and discharging negative electrode and the auxiliary device, and is used to make the voltage difference between the charging and discharging negative electrode and the auxiliary device greater than the first preset voltage.

[0011] In an optional embodiment of the present application, a voltage maintaining device is electrically connected between the charging and discharging positive electrode and the conductive contact member, and is used to make the voltage difference between the charging and discharging positive electrode and the conductive contact member less than a second preset voltage, wherein the difference between the total voltage of the battery and the second preset voltage is greater than the first preset voltage.

[0012] In an optional embodiment of the present application, the charging and discharging device also includes an auxiliary device, which is used to indirectly contact and conduct with the shell; the voltage maintaining device is electrically connected between the charging and discharging positive electrode and the auxiliary device, and is used to make the voltage difference between the charging and discharging positive electrode and the auxiliary device less than a second preset voltage, wherein the difference between the total voltage of the battery and the second preset voltage is greater than the first preset voltage.

[0013] In an optional embodiment of the present application, the conductive contact is a temperature probe.

[0014] In an optional embodiment of the present application, the voltage maintaining device includes a voltage regulating circuit.

[0015] According to another aspect of the present application, a battery production method is provided. The battery production method is used in the battery production system of any embodiment of the present application. The battery production method includes:

[0016] A voltage maintaining device is provided on the device body of the charging and discharging device so that the voltage difference between the charging and discharging negative electrode of the charging and discharging device and the conductive contact is greater than a first preset voltage, wherein the first preset voltage is 0.8V; the charging and discharging positive electrode of the charging and discharging device is electrically connected to the positive electrode of the battery; the charging and discharging negative electrode of the charging and discharging device is electrically connected to the negative electrode of the battery; the conductive contact of the charging and discharging device is electrically connected to the battery casing; and the charging and discharging device is controlled to charge and discharge the battery.

[0017] In an optional embodiment of the present application, a voltage maintaining device is provided on the device body of the charging and discharging device so that the voltage difference between the charging and discharging negative electrode and the conductive contact of the charging and discharging device is greater than a first preset voltage, including: electrically connecting the voltage maintaining device between the charging and discharging negative electrode and the conductive contact so that the voltage difference between the charging and discharging negative electrode and the conductive contact is greater than the first preset voltage; or electrically connecting the voltage maintaining device between the charging and discharging positive electrode and the conductive contact so that the voltage difference between the charging and discharging positive electrode and the conductive contact is less than a second preset voltage, wherein the difference between the total voltage of the battery and the second preset voltage is greater than the first preset voltage.

[0018] In an optional embodiment of the present application, the charging and discharging device further includes an auxiliary device, which is used to indirectly contact and conduct with the shell; a voltage maintaining device is provided on the device body of the charging and discharging device to make the voltage difference between the charging and discharging negative electrode of the charging and discharging device and the conductive contact member greater than a first preset voltage, including: electrically connecting the voltage maintaining device between the charging and discharging negative electrode and the auxiliary device to make the voltage difference between the charging and discharging negative electrode and the auxiliary device greater than the first preset voltage; or, electrically connecting the voltage maintaining device between the charging and discharging positive electrode and the auxiliary device to make the voltage difference between the charging and discharging positive electrode and the auxiliary device less than a second preset voltage, wherein the difference between the total voltage of the battery and the second preset voltage is greater than the first preset voltage.

[0019] When the voltage difference between the shell and the negative electrode of the battery is not greater than 0.8V, it is difficult to maintain a dense oxide layer on the surface of the shell, and the shell is easily corroded. From the production data, the situation where the voltage of the shell to the negative electrode of the battery is lower than 0.8V often occurs during the charging and discharging process of production. The technical solution of the embodiment of the present application is to set a voltage maintenance device on the charging and discharging equipment used in the charging and discharging process to maintain the voltage difference between the charging and discharging negative electrode and the conductive contact greater than 0.8V. Since the charging and discharging positive electrode is electrically conductive with the positive electrode of the battery, the charging and discharging negative electrode is electrically conductive with the negative electrode of the battery, and the conductive contact is electrically conductive with the shell, the voltage difference between the negative electrode of the battery and the shell is also greater than 0.8V during the charging and discharging process. Therefore, during the production process, the voltage difference between the shell and the negative electrode of the battery will not be less than 0.8V due to some abnormal conditions, that is, the possibility of the oxide film of the shell being reduced is eliminated, and the dense oxide layer on the surface of the shell can be maintained, which has a good anti-corrosion effect. At the same time, the positive electrode of the battery does not need to be conductively arranged with the shell, so the positive electrode of the battery can be insulated from the shell, improving the safety performance of the battery pack.

[0020] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] FIG1 is a schematic structural diagram of a battery production system provided in Example 1 of the present application.

[0023] FIG2 is a schematic structural diagram of another battery production system provided in Example 1 of the present application.

[0024] FIG3 is a schematic structural diagram of another battery production system provided in Example 1 of the present application.

[0025] FIG4 is a schematic structural diagram of another battery production system provided in Example 1 of the present application.

[0026] FIG5 is a flow chart of a battery production method provided in Example 2 of the present application.

[0027] Among them: 1. Charging and discharging equipment; 11. Equipment body; 12. Charging and discharging positive electrode; 13. Charging and discharging negative electrode; 14. Voltage maintaining device; 141. Voltage regulating circuit; 15. Conductive contact; 16. Auxiliary device; 2. Battery; 21. Battery positive electrode; 22. Battery negative electrode; 23. Shell. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0030] Example 1

[0031] Figure 1 is a structural diagram of a battery production system provided in Example 1 of the present application. As shown in Figure 1, the battery production system includes a charging and discharging device 1 and a battery 2. The charging and discharging device 1 is a device used to charge and discharge the battery 2 in the charging and discharging process during the production of the battery 2.

[0032] The charging and discharging device 1 includes a device body 11, a charging and discharging positive electrode 12, a charging and discharging negative electrode 13, a voltage maintaining device 14 and a conductive contact 15; the device body 11 is the main part of the charging and discharging device 1, and the charging and discharging positive electrode 12, the charging and discharging negative electrode 13, the voltage maintaining device 14 and the conductive contact 15 are all arranged on the device body 11. The charging and discharging positive electrode 12, the charging and discharging negative electrode 13 and the conductive contact 15 are at least partially located outside the device body 11 to facilitate later contact and conduction with the battery 2.

[0033] The voltage maintaining device 14 may be disposed inside the device body 11 , which may protect the voltage maintaining device 14 from external impact and damage, or may reduce the impact of the external environment on the voltage maintaining device 14 .

[0034] In some embodiments, the voltage maintaining device 14 may also be installed outside the device body 11, which is not specifically limited here.

[0035] The voltage maintaining device 14 is a device capable of maintaining a voltage difference. The voltage maintaining device 14 is used to maintain the voltage difference between the charge and discharge negative electrode 13 and the conductive contact 15 so that the voltage difference between the charge and discharge negative electrode 13 and the conductive contact 15 is greater than a first preset voltage, wherein the first preset voltage is 0.8V.

[0036] In some embodiments, the voltage maintaining device 14 includes a voltage regulating circuit 141, which is a circuit capable of regulating voltage. By electrically connecting the voltage regulating circuit 141 to a suitable position, the voltage difference between the charge and discharge negative electrode 13 and the conductive contact 15 can be adjusted so that the voltage difference between the charge and discharge negative electrode 13 and the conductive contact 15 is greater than 0.8V.

[0037] In some embodiments, the voltage maintaining device 14 includes a DC voltage regulator that maintains the output voltage of a conventional power supply constant regardless of load or input voltage variations, thereby maintaining the voltage difference between the charge and discharge cathode 13 and the conductive contact 15 at a value greater than 0.8V.

[0038] In some embodiments, the voltage maintaining device 14 includes a voltage stabilizing power supply, which is an electronic device that can provide stable AC or DC power to a load, thereby stabilizing the voltage difference between the charge and discharge negative electrode 13 and the conductive contact 15 to be greater than 0.8V.

[0039] Depending on the usage requirements, the voltage maintaining device 14 may include different circuits. The specific structure of the voltage maintaining device 14 is not limited here, as long as the voltage difference between the charge and discharge negative electrode 13 and the conductive contact 15 can be greater than 0.8V.

[0040] Battery 2 includes a battery cell and a housing 23. In this embodiment, housing 23 is an aluminum shell. The battery cell has a positive electrode 21 and a negative electrode 22. The battery cell is disposed within housing 23, with both the positive electrode 21 and the negative electrode 22 extending out of the housing 23. The positive charge / discharge electrode 12 is electrically connected to the positive electrode 21, the negative charge / discharge electrode 13 is electrically connected to the negative electrode 22, and the conductive contact 15 is electrically connected to the housing 23. When the positive charge / discharge electrode 12 is electrically connected to the positive electrode 21, the negative charge / discharge electrode 13 is electrically connected to the negative electrode 22, and the conductive contact 15 is electrically connected to the housing 23, the charging / discharging device 1 is electrically connected to the battery 2, forming a closed circuit, enabling the charging / discharging device 1 to charge and discharge the battery 2. Furthermore, because the voltage difference between the negative charge / discharge electrode 13 and the conductive contact 15 is greater than 0.8V, the voltage difference between the negative electrode 22 of the battery 2 and the housing 23 is also greater than 0.8V.

[0041] In this embodiment, the battery positive electrode 21 is insulated from the shell 23. The insulation method can be any conventional method for insulating the positive electrode of the battery 2 and the shell 23 in the related art, which is not specifically limited here.

[0042] In a specific embodiment, during the charge and discharge process in the production of the battery 2, the battery 2 is located below the charge and discharge positive electrode 12, the charge and discharge negative electrode 13, and the conductive contact 15 of the device body 11, with the battery positive electrode 21 facing the charge and discharge positive electrode 12, and the battery negative electrode 22 facing the charge and discharge negative electrode 13. When the charge and discharge positive electrode 12, the charge and discharge negative electrode 13, and the conductive contact 15 move downward, the charge and discharge positive electrode 12 contacts and conducts with the battery positive electrode 21, the charge and discharge negative electrode 13 contacts and conducts with the battery negative electrode 22, and the conductive contact 15 contacts and conducts with the housing 23. The charge and discharge device 1 is then electrically connected to the battery 2, forming a closed circuit, so that the charge and discharge device 1 can charge and discharge the battery 2.

[0043] When the voltage difference between the shell 23 and the battery negative electrode 22 is not greater than 0.8 V, it is difficult for the shell 23 surface to maintain a dense oxide layer, and the shell 23 is easily corroded. According to production data, the voltage difference between the housing 23 and the negative electrode 22 of the battery often falls below 0.8V during the charge and discharge process. This solution maintains the voltage difference between the negative electrode 13 and the conductive contact 15 at a level greater than 0.8V by installing a voltage maintenance device 14 on the charge and discharge device 1 used during the charge and discharge process. Since the positive electrode 12 is electrically conductive with the positive electrode 21, the negative electrode 13 is electrically conductive with the negative electrode 22, and the conductive contact 15 is electrically conductive with the housing 23 during the charge and discharge process, the voltage difference between the negative electrode 22 and the housing 23 of the battery 2 is also greater than 0.8V during the charge and discharge process. This prevents abnormal conditions from causing the voltage difference between the housing 23 and the negative electrode 22 to fall below 0.8V during the production process. This eliminates the possibility of the oxide film on the housing 23 being reduced, maintaining a dense oxide layer on the surface of the housing 23 and providing excellent corrosion protection. Furthermore, since the positive electrode 21 of the battery does not need to be electrically conductively connected to the housing 23, the positive electrode 21 can be insulated from the housing 23, improving the safety of the battery pack 2.

[0044] In an optional embodiment of the present application, the voltage maintaining device 14 is electrically connected between the charge and discharge negative electrode 13 and the conductive contact 15, and is used to make the voltage difference between the charge and discharge negative electrode 13 and the conductive contact 15 greater than the first preset voltage.

[0045] In this embodiment, the voltage maintaining device 14 is a voltage regulating circuit 141. The voltage regulating circuit 141 is electrically connected between the charging and discharging negative electrode 13 and the conductive contact 15. This circuit maintains the potential difference between the charging and discharging negative electrode 13 and the conductive contact 15 at a level greater than a first preset voltage. Since the charging and discharging negative electrode 13 is electrically conductive with the battery negative electrode 22, and the conductive contact 15 is electrically conductive with the housing 23 during the charging and discharging process, the voltage difference between the battery negative electrode 22 and the housing 23 of the battery 2 is also maintained at a level greater than the first preset voltage during the charging and discharging process.

[0046] In an optional embodiment of the present application, as shown in FIG2 , the charging and discharging device 1 further includes an auxiliary device 16, which is used to indirectly contact and conduct with the shell 23; the voltage maintaining device 14 is electrically connected between the charging and discharging negative electrode 13 and the auxiliary device 16, and is used to make the voltage difference between the charging and discharging negative electrode 13 and the auxiliary device 16 greater than a first preset voltage. The auxiliary device 16 refers to a component that is in indirect contact with the shell 23 to achieve electrical conduction during the charging and discharging process. For example, during the charging and discharging process, it may be necessary to fix the battery 2, and the fixing device for fixing the battery 2 will contact the shell 23 of the battery 2. The fixing device is made of a conductive material. At this time, the other components in contact with the fixing device are the auxiliary device 16 that is in indirect contact and conduction with the shell 23. This is just an example. The auxiliary device 16 can be any device that can be in indirect contact and conduction with the shell 23, and is not specifically limited.

[0047] Because the voltage maintaining device 14 is electrically connected between the charge / discharge negative electrode 13 and the auxiliary device 16, the voltage difference between the charge / discharge negative electrode 13 and the auxiliary device 16 is maintained above the first preset voltage. During the charge / discharge process, the charge / discharge negative electrode 13 is electrically conductive with the battery negative electrode 22, and the auxiliary device 16 is indirectly conductive with the housing 23. Therefore, during the charge / discharge process, the voltage difference between the battery negative electrode 22 and the housing 23 of the battery 2 is also maintained above the first preset voltage.

[0048] In an optional embodiment of the present application, as shown in FIG3 , a voltage maintaining device 14 is electrically connected between the charging and discharging positive electrode 12 and the conductive contact 15 , and is configured to maintain a voltage difference between the charging and discharging positive electrode 12 and the conductive contact 15 below a second preset voltage, wherein the difference between the total voltage of the battery 2 and the second preset voltage is greater than the first preset voltage. Since the total voltage of different batteries 2 may vary, the magnitude of the second preset voltage may be adjusted based on the total voltage of the battery 2, and the specific value of the second preset voltage is not specifically limited herein.

[0049] Since the total voltage of the battery 2 is the voltage between the battery positive electrode 21 and the battery negative electrode 22 of the battery 2, and during the charging and discharging process, the charging and discharging positive electrode 12 is electrically conductive with the battery positive electrode 21, the charging and discharging negative electrode 13 is electrically conductive with the battery negative electrode 22, and the conductive contact 15 is electrically conductive with the shell 23, so the voltage between the charging and discharging positive electrode 12 and the conductive contact 15 at this time is the voltage between the battery positive electrode 21 and the shell 23, so when the difference between the total voltage of the battery 2 and the second preset voltage is greater than the first preset voltage, the voltage difference between the battery negative electrode 22 and the shell 23 is also greater than the first preset voltage, so that the voltage difference between the battery negative electrode 22 and the shell 23 can be maintained at greater than the first preset voltage during the charging and discharging process.

[0050] In this embodiment, the voltage maintaining device 14 includes a voltage regulating circuit 141, which is electrically connected between the charging and discharging positive electrode 12 and the conductive contact 15, so that the voltage difference between the charging and discharging positive electrode 12 and the conductive contact 15 can be smaller than the second preset voltage.

[0051] In other embodiments, the voltage maintaining device 14 includes a wire, which is electrically connected between the charging and discharging positive electrode 12 and the conductive contact 15, so that the voltage of the charging and discharging positive electrode 12 and the conductive contact 15 can be the same. At this time, the voltage difference between the two is less than the second preset voltage. Therefore, the potential of the battery positive electrode 21 and the shell 23 are the same during the charging and discharging process, while the voltage between the battery positive electrode 21 and the battery negative electrode 22 of the conventional battery 2 will be greater than the first preset voltage, thereby enabling the voltage difference between the battery negative electrode 22 and the shell 23 to be maintained at greater than the first preset voltage during the charging and discharging process.

[0052] In an optional embodiment of the present application, as shown in Figure 4, the charging and discharging device 1 also includes an auxiliary device 16, which is used to indirectly contact and conduct with the shell 23; the voltage maintaining device 14 is electrically connected between the charging and discharging positive electrode 12 and the auxiliary device 16, and is used to make the voltage difference between the charging and discharging positive electrode 12 and the auxiliary device 16 less than the second preset voltage, wherein the difference between the total voltage of the battery 2 and the second preset voltage is greater than the first preset voltage.

[0053] Because the voltage maintaining device 14 is electrically connected between the charging and discharging positive electrode 12 and the auxiliary device 16, the voltage difference between the charging and discharging positive electrode 12 and the auxiliary device 16 can be kept below the second preset voltage. During the charging and discharging process, the charging and discharging positive electrode 12 is electrically conductive with the battery positive electrode 21, and the auxiliary device 16 is indirectly in contact and conductive with the housing 23. Therefore, at this time, the voltage between the charging and discharging positive electrode 12 and the auxiliary device 16 is equal to the voltage between the battery positive electrode 21 and the housing 23. Therefore, when the difference between the total voltage of the battery 2 and the second preset voltage is greater than the first preset voltage, the voltage difference between the battery negative electrode 22 and the housing 23 is also greater than the first preset voltage. This allows the voltage difference between the battery negative electrode 22 and the housing 23 to be maintained at a level greater than the first preset voltage during the charging and discharging process.

[0054] In this embodiment, the voltage maintaining device 14 includes a voltage regulating circuit 141, which is electrically connected between the charging and discharging positive electrode 12 and the auxiliary device 16, thereby ensuring that the voltage difference between the charging and discharging positive electrode 12 and the auxiliary device 16 is less than a second preset voltage. In other embodiments, the voltage maintaining device 14 includes a wire, which is electrically connected between the charging and discharging positive electrode 12 and the auxiliary device 16, so that the voltages of the charging and discharging positive electrode 12 and the auxiliary device 16 are the same. In this case, the voltage difference between the two is less than the second preset voltage. Therefore, the potentials of the battery positive electrode 21 and the housing 23 are the same during the charging and discharging process, while the voltage between the battery positive electrode 21 and the battery negative electrode 22 of a conventional battery 2 is greater than the first preset voltage, thereby ensuring that the voltage difference between the battery negative electrode 22 and the housing 23 is maintained at a level greater than the first preset voltage during the charging and discharging process.

[0055] In an optional embodiment of the present application, the conductive contact 15 is a temperature probe. During the production process, a temperature probe contacts the housing 23 to monitor the temperature of each battery cell. By directly using the conductive contact 15 as a temperature probe, the voltage difference between the negative electrode 22 of the battery 2 and the housing 23 is maintained at a voltage greater than the first preset voltage without the need for additional components, thereby reducing costs.

[0056] Example 2

[0057] FIG5 is a flow chart of a battery production method provided in Example 2 of the present application. The battery production method is used in the battery production system of any embodiment of the present application. As shown in FIG5 , the battery production method includes:

[0058] S110 , providing a voltage maintaining device on the device body of the charging and discharging device so that the voltage difference between the charging and discharging negative electrode of the charging and discharging device and the conductive contact is greater than a first preset voltage, wherein the first preset voltage is 0.8V.

[0059] Among them, the voltage maintaining device refers to a device that can maintain the voltage difference. By setting the voltage maintaining device on the charging and discharging equipment, the voltage difference between the charging and discharging negative electrode and the conductive contact can be maintained so that the voltage difference between the charging and discharging negative electrode and the conductive contact is greater than 0.8V.

[0060] In some embodiments, the voltage maintaining device includes a voltage regulating circuit, which is a circuit capable of regulating voltage. By electrically connecting the voltage regulating circuit to a suitable position, the voltage difference between the charging and discharging negative electrode and the conductive contact can be adjusted so that the voltage difference between the charging and discharging negative electrode and the conductive contact is greater than 0.8V.

[0061] S120 , electrically connecting the charging and discharging positive electrode of the charging and discharging device to the positive electrode of the battery.

[0062] Among them, the charging and discharging positive electrode and the battery positive electrode can be electrically connected by simply contacting the charging and discharging positive electrode with the battery positive electrode.

[0063] S130 , electrically connecting the charging and discharging negative electrode of the charging and discharging device to the negative electrode of the battery.

[0064] Among them, the charging and discharging negative electrode and the battery negative electrode can be electrically connected by simply contacting the charging and discharging negative electrode with the battery negative electrode.

[0065] S140 , electrically connecting the conductive contact of the charging and discharging device to the battery housing.

[0066] The conductive contact piece and the housing can be electrically connected by simply bringing the conductive contact piece into contact with the housing.

[0067] Furthermore, steps S120, S130, and S140 can be executed simultaneously or in separate steps, and the order of execution is not limited. That is, the positive charging and discharging electrode and the positive electrode of the battery, the negative charging and discharging electrode and the negative electrode of the battery, and the conductive contact member and the housing can be connected sequentially or simultaneously. Any order can be used for sequential connection. For example, the positive charging and discharging electrode and the positive electrode of the battery can be connected first, followed by the negative charging and discharging electrode and the negative electrode of the battery, and finally the conductive contact member and the housing. Alternatively, the negative charging and discharging electrode and the negative electrode of the battery can be connected first, followed by the positive charging and discharging electrode and the positive electrode of the battery, and finally the conductive contact member and the housing. The order of execution of S120, S130, and S140 is not specifically limited herein; as long as the positive charging and discharging electrode and the positive electrode of the battery, the negative charging and discharging electrode and the negative electrode of the battery, and the conductive contact member and the housing are all connected accordingly, it will suffice.

[0068] S150: Control the charging and discharging equipment to charge and discharge the battery.

[0069] When the positive charging and discharging electrode is electrically conductive with the positive electrode of the battery, the negative charging and discharging electrode is electrically conductive with the negative electrode of the battery, and the conductive contact is electrically conductive with the casing, the charging and discharging device is electrically connected to the battery, forming a closed circuit, allowing the charging and discharging device to charge and discharge the battery. In addition, because the voltage difference between the negative charging and discharging electrode and the conductive contact is greater than 0.8V, the voltage difference between the negative electrode of the battery and the casing is also greater than 0.8V.

[0070] When the voltage difference between the housing and the battery's negative electrode is less than 0.8V, it's difficult to maintain a dense oxide layer on the housing surface, making the housing susceptible to corrosion. Production data indicates that the voltage of the housing relative to the battery's negative electrode often falls below 0.8V during the charge-discharge process. This solution maintains a voltage difference between the negative electrode and the conductive contact greater than 0.8V by installing a voltage maintenance device on the charging and discharging equipment used during the charge-discharge process. Since the positive electrode is electrically conductive with the battery's positive electrode, the negative electrode is electrically conductive with the battery's negative electrode, and the conductive contact is electrically conductive with the housing during the charge-discharge process, the voltage difference between the negative electrode and the housing is also greater than 0.8V during the charge-discharge process. This prevents abnormal conditions from causing the voltage difference between the housing and the negative electrode to fall below 0.8V during the production process. This eliminates the possibility of the housing's oxide film being reduced, maintaining a dense oxide layer on the housing surface and providing excellent corrosion protection. Furthermore, the positive electrode does not need to be electrically conductive to the housing, so it can be insulated from the housing, improving the safety of the battery pack.

[0071] In an optional embodiment of the present application, a voltage maintaining device is provided on the device body of the charging and discharging device so that the voltage difference between the charging and discharging negative electrode and the conductive contact of the charging and discharging device is greater than a first preset voltage, including: electrically connecting the voltage maintaining device between the charging and discharging negative electrode and the conductive contact so that the voltage difference between the charging and discharging negative electrode and the conductive contact is greater than the first preset voltage.

[0072] In this embodiment, the voltage maintaining device is a voltage regulating circuit electrically connected between the negative charging and discharging electrodes and the conductive contact. This circuit is capable of maintaining the potential difference between the negative charging and discharging electrodes and the conductive contact at a level greater than a first preset voltage. Since the negative charging and discharging electrodes are electrically conductive with the negative electrode of the battery, and the conductive contact is electrically conductive with the battery casing during the charging and discharging process, the voltage difference between the negative electrode of the battery and the battery casing is also maintained at a level greater than the first preset voltage during the charging and discharging process.

[0073] In an optional embodiment of the present application, a voltage maintaining device is provided on the device body of the charging and discharging device so that the voltage difference between the charging and discharging negative electrode and the conductive contact of the charging and discharging device is greater than a first preset voltage, including: electrically connecting the voltage maintaining device between the charging and discharging positive electrode and the conductive contact so that the voltage difference between the charging and discharging positive electrode and the conductive contact is less than a second preset voltage, wherein the difference between the total voltage of the battery and the second preset voltage is greater than the first preset voltage.

[0074] Since the total voltage of the battery is the voltage between the positive electrode and the negative electrode of the battery, and during the charging and discharging process, the charging and discharging positive electrode is electrically conductive with the positive electrode of the battery, the charging and discharging negative electrode is electrically conductive with the negative electrode of the battery, and the conductive contact is electrically conductive with the shell, so the voltage between the charging and discharging positive electrode and the conductive contact at this time is the voltage between the positive electrode of the battery and the shell, so when the difference between the total voltage of the battery and the second preset voltage is greater than the first preset voltage, the voltage difference between the negative electrode of the battery and the shell is also greater than the first preset voltage, so that the voltage difference between the negative electrode of the battery and the shell can be maintained at greater than the first preset voltage during the charging and discharging process.

[0075] In an optional embodiment of the present application, the charging and discharging device further includes an auxiliary device, which is used to indirectly contact and conduct with the shell; a voltage maintaining device is provided on the device body of the charging and discharging device so that the voltage difference between the charging and discharging negative electrode of the charging and discharging device and the conductive contact member is greater than a first preset voltage, including: electrically connecting the voltage maintaining device between the charging and discharging negative electrode and the auxiliary device so that the voltage difference between the charging and discharging negative electrode and the auxiliary device is greater than the first preset voltage.

[0076] The term "auxiliary device" refers to a component that indirectly contacts and electrically connects to the battery housing during the charging and discharging process. For example, a battery may need to be secured during the charging and discharging process, and a fixture for securing the battery may contact the battery housing. The fixture is made of a conductive material, and any other component in contact with the fixture is an auxiliary device that indirectly contacts and electrically connects to the battery housing. This is merely an example, and the auxiliary device can be any device that can indirectly contact and electrically connect to the battery housing, and is not specifically limited here.

[0077] Because the voltage maintaining device is electrically connected between the charging and discharging negative electrode and the auxiliary device, the voltage difference between the charging and discharging negative electrode and the auxiliary device can be maintained above the first preset voltage. Since the charging and discharging negative electrode is electrically conductive with the battery's negative electrode, and the auxiliary device is indirectly in contact with the battery's housing during the charging and discharging process, the voltage difference between the battery's negative electrode and the battery's housing is also maintained above the first preset voltage during the charging and discharging process.

[0078] In an optional embodiment of the present application, the charging and discharging device further includes an auxiliary device, which is used to indirectly contact and conduct with the shell; a voltage maintaining device is provided on the device body of the charging and discharging device to make the voltage difference between the charging and discharging negative electrode of the charging and discharging device and the conductive contact member greater than a first preset voltage, including: electrically connecting the voltage maintaining device between the charging and discharging positive electrode and the auxiliary device to make the voltage difference between the charging and discharging positive electrode and the auxiliary device less than a second preset voltage, wherein the difference between the total voltage of the battery and the second preset voltage is greater than the first preset voltage.

[0079] Because the voltage maintaining device is electrically connected between the positive charging and discharging electrodes and the auxiliary device, the voltage difference between the positive charging and discharging electrodes and the auxiliary device can be maintained below a second preset voltage. During the charging and discharging process, the positive charging and discharging electrodes are electrically conductive with the positive electrode of the battery, and the auxiliary device is indirectly conductive with the housing. Therefore, the voltage between the positive charging and discharging electrodes and the auxiliary device is equal to the voltage between the positive electrode of the battery and the housing. Therefore, when the difference between the total battery voltage and the second preset voltage is greater than the first preset voltage, the voltage difference between the negative battery electrode and the housing is also greater than the first preset voltage, thereby maintaining the voltage difference between the negative battery electrode and the housing at a level greater than the first preset voltage during the charging and discharging process.

[0080] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this application can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this application can be achieved. This is not limited herein.

[0081] The above specific embodiments do not constitute a limitation on the scope of protection of this application. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application shall be included within the scope of protection of this application.

Claims

1. A battery production system, characterized in that: It includes a charging and discharging device and a battery, wherein the charging and discharging device is used to charge and discharge the battery, and the charging and discharging device includes a device body, a charging and discharging positive electrode, a charging and discharging negative electrode, a voltage maintaining device and a conductive contact; The charging and discharging positive electrode, the charging and discharging negative electrode, the voltage maintaining device and the conductive contact are all arranged on the device body; The voltage maintaining device is used to maintain the voltage difference between the charge and discharge negative electrode and the conductive contact member, so that the voltage difference between the charge and discharge negative electrode and the conductive contact member is greater than a first preset voltage, wherein the first preset voltage is 0.8V; The battery comprises a battery core and a shell, wherein the battery core has a positive electrode and a negative electrode, the battery core is arranged in the shell, and the positive electrode and the negative electrode both pass through the shell; The charging and discharging positive electrode is used for electrical conduction with the positive electrode of the battery, the charging and discharging negative electrode is used for electrical conduction with the negative electrode of the battery, and the conductive contact is used for electrical conduction with the shell.

2. The battery production system according to claim 1, characterized in that: The voltage maintaining device is electrically connected between the charge and discharge negative electrode and the conductive contact member, and is used to make the voltage difference between the charge and discharge negative electrode and the conductive contact member greater than a first preset voltage.

3. The battery production system according to claim 1, characterized in that: The charging and discharging device further comprises an auxiliary device, wherein the auxiliary device is used for indirect contact and conduction with the housing; The voltage maintaining device is electrically connected between the charge and discharge negative electrode and the auxiliary device, and is used to make the voltage difference between the charge and discharge negative electrode and the auxiliary device greater than a first preset voltage.

4. The battery production system according to claim 1, characterized in that: The voltage maintaining device is electrically connected between the charging and discharging positive electrode and the conductive contact, and is used to make the voltage difference between the charging and discharging positive electrode and the conductive contact less than a second preset voltage, wherein the difference between the total voltage of the battery and the second preset voltage is greater than the first preset voltage.

5. The battery production system according to claim 1, characterized in that: The charging and discharging device further comprises an auxiliary device, wherein the auxiliary device is used for indirect contact and conduction with the housing; The voltage maintaining device is electrically connected between the charging and discharging positive electrode and the auxiliary device, and is used to make the voltage difference between the charging and discharging positive electrode and the auxiliary device smaller than a second preset voltage, wherein the The difference between the total voltage of the battery and the second preset voltage is greater than the first preset voltage.

6. The battery production system according to any one of claims 1 to 5, characterized in that: The conductive contact is a temperature probe.

7. The battery production system according to any one of claims 1 to 5, characterized in that: The voltage maintaining device includes a voltage regulating circuit.

8. A battery production method, characterized in that: A battery production system for use in any one of claims 1 to 7, wherein the battery production method comprises: A voltage maintaining device is provided on the device body of the charging and discharging device so that the voltage difference between the charging and discharging negative electrode of the charging and discharging device and the conductive contact member is greater than a first preset voltage, wherein the first preset voltage is 0.8V; Connecting the charging and discharging positive electrode of the charging and discharging device to the positive electrode of the battery; Electrically connecting the charging and discharging negative electrode of the charging and discharging device to the battery negative electrode of the battery; Connecting the conductive contact of the charging and discharging device to the battery housing; The charging and discharging device is controlled to charge and discharge the battery.

9. The battery production method according to claim 8, characterized in that: The voltage maintaining device is provided on the device body of the charging and discharging device so that the voltage difference between the charging and discharging negative electrode and the conductive contact of the charging and discharging device is greater than a first preset voltage, including: The voltage maintaining device is electrically connected between the charge and discharge negative electrode and the conductive contact member, so that the voltage difference between the charge and discharge negative electrode and the conductive contact member is greater than a first preset voltage; Alternatively, the voltage maintaining device is electrically connected between the charging and discharging positive electrode and the conductive contact member so that the voltage difference between the charging and discharging positive electrode and the conductive contact member is less than a second preset voltage, wherein the difference between the total voltage of the battery and the second preset voltage is greater than the first preset voltage.

10. The battery production method according to claim 8, characterized in that: The charging and discharging device further includes an auxiliary device, which is used to indirectly contact and conduct with the shell; the voltage maintaining device is provided on the device body of the charging and discharging device so that the voltage difference between the charging and discharging negative electrode of the charging and discharging device and the conductive contact piece is greater than a first preset voltage, including: The voltage maintaining device is electrically connected between the charge and discharge negative electrode and the auxiliary device to Making the voltage difference between the charge and discharge negative electrode and the auxiliary device greater than a first preset voltage; Alternatively, the voltage maintaining device is electrically connected between the charging and discharging positive electrode and the auxiliary device to make the voltage difference between the charging and discharging positive electrode and the auxiliary device less than a second preset voltage, wherein the difference between the total voltage of the battery and the second preset voltage is greater than the first preset voltage.

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