Battery temperature regulation and control device and battery self-discharge test system

Abstract

The utility model provides a battery temperature regulation and control device and a battery self-discharge test system. The battery temperature regulation and control device is configured to regulate and control the temperature of a battery in a battery self-discharge test process, and the battery temperature regulation and control device comprises: a cavity having a chamber configured to accommodate the battery; the cavity is also provided with a feeding hole and a cavity door; the feeding hole is configured to allow the battery to enter and exit from the chamber; the cavity door is configured to open or close the feeding hole; a heating assembly configured to heat the chamber; the cooling assembly is configured to cool the heated chamber; and the constant temperature assembly is configured to keep the temperature in the cooled chamber within a first temperature range. According to the battery temperature regulation and control device, the change of different temperatures can be realized, the occupied area of the battery temperature regulation and control device is reduced, the space utilization rate of the cavity and the self-discharge test efficiency are improved, and the battery self-discharge test period is shortened.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery temperature control device and a battery self-discharge test system. Background Art

[0002] Currently, lithium-ion batteries are widely used, especially in the vehicle industry. Among them, during the manufacturing process of lithium batteries, it is usually necessary to conduct self-discharge tests on lithium batteries to confirm whether there are internal defects in the lithium batteries. However, the existing self-discharge test cycle of lithium batteries is relatively long, the floor area of the test device is relatively large, and the cost is relatively high. Summary of the Utility Model

[0003] The battery temperature control device and the battery self-discharge test system provided by this application aim to solve the problems of relatively long self-discharge test cycle of lithium batteries, relatively large floor area of the test device, and relatively high cost.

[0004] To solve the above technical problems, a technical solution adopted by this application is: to provide a battery temperature control device configured to control the temperature of a battery during a battery self-discharge test. The battery temperature control device includes:

[0005] A cavity having a chamber configured to accommodate the battery; the cavity further has a feed port and a cavity door; the feed port is configured to allow the battery to enter and exit the chamber; the cavity door is configured to open or close the feed port;

[0006] A heating component configured to heat the chamber;

[0007] A cooling component configured to cool the heated chamber;

[0008] A constant temperature component configured to keep the temperature in the cooled chamber within a first temperature range.

[0009] The above battery temperature control device includes a cavity, a heating component, a cooling component, and a constant temperature component; the cavity has a chamber that can accommodate the battery during the self-discharge test of the battery; and the chamber can be heated by the heating component to create a high-temperature environment inside the chamber, so that the battery can undergo a high-temperature reaction inside the chamber. At the same time, the cavity is provided with a feed port and a chamber door, and the chamber door can open or close the feed port; in this way, the transportation device can smoothly enter and exit the chamber through the feed port; and after the transportation device enters or exits the chamber, the feed port can be closed by the chamber door, improving the sealing performance of the chamber, facilitating rapid temperature changes inside the chamber; at the same time, it can reduce the risk of external dust, particles and other pollutants contaminating the chamber; and reduce the risk of the heating elements inside the chamber being weathered due to long-term exposure. In addition, after the self-discharge heating test, the chamber can be cooled by the cooling component to achieve rapid cooling of the chamber. Moreover, after the temperature inside the chamber is reduced, the constant temperature component can be used to control the temperature inside the chamber to remain within the first temperature range to achieve normal temperature static placement of the battery during the self-discharge test of the battery. Compared with the solution of setting multiple cavities with different temperatures and transporting the battery to cavities with different temperatures respectively during the self-discharge test of the battery, this battery temperature control device combines multiple cavities with different temperatures into one cavity that can achieve different temperature changes, that is, it reduces the number of cavities, reduces costs, reduces the floor area of this battery temperature control device, and improves the space utilization rate of the cavity; and it eliminates the process of transporting the battery to cavities with different temperatures, improves the self-discharge test efficiency, and shortens the test cycle. In addition, by heating the chamber with a dedicated heating component, the heating efficiency is improved, and the temperature rise of the chamber can be quickly achieved; and by cooling the chamber with a dedicated cooling component, the cooling efficiency is improved, and rapid cooling can be achieved, further improving the self-discharge test efficiency and shortening the test cycle.

[0010] In one embodiment, the heating component includes: a heating element disposed on the inner wall surface of the cavity to heat the chamber; a pressure source disposed outside the cavity and communicating with the chamber, and configured to transport a gas with a first preset pressure into the chamber; the first preset pressure is greater than the initial pressure inside the chamber.

[0011] In the above solution, by arranging the heating element on the inner wall surface of the cavity, compared with arranging it on the outside of the cavity, the temperature can be raised quickly, improving the heating efficiency; and compared with arranging the heating element at other spatial positions inside the cavity, the occupancy rate of the space inside the cavity can be reduced. Additionally, by using a pressure source to deliver gas at a first preset pressure into the cavity, the pressurization of the cavity can be achieved quickly to realize high-temperature pressurization inside the cavity, improving the detection rate of the self-discharge test of the battery. Moreover, by adopting the method of heating with the heating element and delivering pressurized gas with the pressure source, the heating method is relatively simple, and the gas at the first preset pressure can be used as a heat conduction medium to quickly and evenly conduct the heat generated by the heating element to all positions of the cavity, which can improve the heating efficiency inside the sealed cavity.

[0012] In one embodiment, the heating element includes a heating plate that covers all the inner wall surfaces of the cavity.

[0013] In the above solution, by making the heating element include a heating plate, compared with a heating block, the heat generated by the heating plate has a better heat dissipation effect outward, which is more conducive to heating the gas near the heating element, and the heating efficiency is higher. Additionally, by making the heating plate cover all the inner wall surfaces of the cavity, the heating efficiency can be further effectively improved, and the heating uniformity of the gas inside the cavity by the heating element can be improved, reducing the risk of local high temperature inside the cavity.

[0014] In one embodiment, the temperature reduction component includes: a first gas source, arranged outside the cavity and communicating with the cavity, and configured to deliver gas in a second temperature range into the heated cavity, where the second temperature range is lower than the temperature inside the heated cavity.

[0015] In the above solution, by directly delivering low-temperature gas into the cavity using the first gas source, the temperature inside the cavity can be quickly reduced, improving the cooling rate and shortening the cycle of the self-discharge test. At the same time, by arranging the first gas source outside the cavity, the first gas source does not occupy the space inside the cavity, and more batteries can be temperature-controlled at one time by this battery temperature control device.

[0016] In one embodiment, the pressure of the gas in the second temperature range is greater than the initial pressure inside the cavity.

[0017] In the above solution, by making the gas in the second temperature range be pressurized gas, the cavity can still be in a pressurized state during the cooling process to improve the detection rate of the self-discharge test; and there is no need to additionally install a pressurization device for pressurizing the gas in the second temperature range, saving space and cost.

[0018] In one embodiment, the constant temperature component includes: a second gas source, which is arranged outside the chamber, communicates with the chamber, and is configured to convey gas within a first temperature range into the cooled chamber; wherein, the pressure of the gas within the first temperature range is greater than the initial pressure within the chamber; the first temperature range is less than the temperature within the heated chamber and greater than or equal to the second temperature range.

[0019] In the above solution, after the temperature within the chamber drops to the fourth temperature range, the second gas source is used to directly convey gas within the first temperature range into the chamber, which can keep the temperature within the chamber within the first temperature range, so that the battery can be left standing for a preset time in this normal temperature state for subsequent testing processes. Moreover, directly conveying gas within the first temperature range is simple and convenient in operation, can shorten the self-discharge test cycle; and compared with setting other heat preservation devices, the temperature fluctuation within the chamber is smaller, and the accuracy of the self-discharge test result is higher. At the same time, by making the pressure of the gas within the first temperature range greater than the initial pressure within the chamber, the chamber can be in a normal temperature pressurized state, so that the battery remains in a pressurized state during the normal temperature standing process of the battery, thereby improving the detection rate of the self-discharge test; and there is no need to additionally install a pressurization device for pressurizing the gas within the first temperature range, saving space and cost.

[0020] In one embodiment, it further includes: an air extraction component, which is arranged outside the chamber, communicates with the chamber, and is configured to extract the gas within the chamber when conveying gas within the first temperature range or the second temperature range into the chamber.

[0021] In the above solution, during the process of conveying gas within the second temperature range, the air extraction component is used to suck the gas within the chamber at the same time. In this way, the low-temperature gas can be used to cool the high-temperature gas, and the high-temperature dry gas within the chamber can be recovered by suction, realizing the replacement of hot and cold gases within the chamber, facilitating the rapid cooling within the chamber, effectively shortening the cycle of temperature change within the chamber, and further shortening the self-discharge test cycle. In addition, during the process of conveying gas within the first temperature range, the air extraction component is used to suck the gas within the chamber at the same time to realize the gas circulation within the chamber, and the pressurized environment within the chamber is maintained by the gas within the first temperature range to improve the detection rate of the self-discharge test.

[0022] In one embodiment, it further includes: a temperature sensor, which is configured to sense and display the temperature value within the chamber; a heating component is configured to heat the temperature value within the chamber to the third temperature range; a first gas source is configured to convey gas within the second temperature range into the chamber when the time for the temperature value within the chamber to reach the third temperature range is not less than a first preset time; a second gas source is configured to convey gas within the first temperature range into the chamber when the temperature value within the chamber drops from the third temperature range to the fourth temperature range; wherein, the fourth temperature range is greater than or equal to the first temperature range.

[0023] In the above solution, by setting a temperature sensor, the temperature value in the chamber can be monitored and displayed in real time, reducing the influence of test result deviation caused by uneven temperature during the test process. At the same time, the first gas source and the second gas source can also deliver gas within the first temperature range or the second temperature range to the chamber in a timely manner according to the sensed temperature value to achieve a rapid change in the temperature in the chamber. In addition, when the time for the temperature value in the chamber to reach the third temperature range is not less than the first preset time, by delivering gas within the second temperature range to the chamber through the first gas source, the battery can undergo a sufficient high-temperature reaction. Moreover, when the temperature value in the chamber drops to the fourth temperature range and then the first temperature range gas is delivered to the chamber through the second gas source, compared with directly delivering the first temperature range gas to the chamber when the time for the temperature value in the chamber to reach the third temperature range is not less than the first preset time, since the second temperature range is smaller than the first temperature range, the cooling efficiency of using the second temperature range for cooling is higher, and the test cycle can be further shortened.

[0024] In one embodiment, it further includes: a temperature sensor configured to sense the temperature value in the chamber; a controller electrically connected to the temperature sensor, and in response to the time for the temperature value in the chamber to reach the third temperature range being not less than the first preset time, controlling the first gas source to deliver gas within the second temperature range to the chamber; and in response to the temperature in the chamber dropping from the third temperature range to the fourth temperature range, controlling the second gas source to deliver gas within the first temperature range to the chamber; wherein the fourth temperature range is greater than or equal to the first temperature range.

[0025] In the above solution, compared with the previous embodiment, by setting a controller electrically connected to the temperature sensor and making the controller respond to the time for the temperature value in the chamber to reach the third temperature range being not less than the first preset time, the first gas source is automatically controlled to be turned on to deliver gas within the second temperature range to the chamber in a timely manner to reduce the temperature in the chamber and achieve a rapid change in the temperature in the chamber. Moreover, by making the controller respond to the temperature in the chamber dropping from the third temperature range to the fourth temperature range and automatically controlling the second gas source to be turned on to deliver gas within the first temperature range to the chamber, the risk of the temperature in the chamber being too low due to the slow delivery of the first temperature range gas can be reduced. In addition, by controlling the opening and closing of the first gas source and the second gas source through the controller, compared with manually opening or closing the first gas source and the second gas source, the degree of automation is higher and the temperature regulation is more precise.

[0026] In one embodiment, at least one or more of the gas with the first preset pressure, the gas within the first temperature range, and the gas within the second temperature range is a dry gas; the relative humidity of the dry gas is not greater than 1.0%RH.

[0027] In the above solution, by making one or more of the gases delivered into the chamber dry gases, the risk of condensation in the chamber can be reduced, and during the self-discharge test of the battery, the risk of the battery condensing in the chamber can be reduced.

[0028] In one embodiment, the chamber further has an air inlet end communicating with the chamber; at least one or more of the pressure source, the first gas source, and the second gas source are respectively connected to the air inlet end to communicate with the chamber through the air inlet end.

[0029] In the above solution, by making the pressure source, the first gas source, and the second gas source communicate with the chamber through the same air inlet end, the sealing performance of the chamber can be improved, which is beneficial to achieving a rapid change in the temperature in the chamber; and the pressure source, the first gas source, and the second gas source can share a main air inlet pipeline, simplifying the structure and reducing the cost.

[0030] To solve the above technical problems, another technical solution adopted in this application is: to provide a battery self-discharge test system, which includes: the battery temperature control device involved above; at least one transport device configured to carry and transport the battery into the chamber of the battery temperature control device.

[0031] In the above solution, the transport device is used to carry and transport the battery into the chamber of the battery temperature control device so that the battery undergoes high-temperature reaction acceleration and normal-temperature placement in the chamber; in this way, the transport device can directly carry the battery in the chamber, eliminating the need to set up a static shelf for carrying the battery in the chamber; at the same time, the transport device can directly run on the bottom wall of the chamber, eliminating the need to set up a dedicated track for the logistics cart to run in the chamber, effectively reducing the cost.

[0032] In one embodiment, the battery temperature control device includes at least one temperature sensor, and at least one temperature sensor is respectively arranged on the transport device, and one temperature sensor is arranged on one transport device.

[0033] In the above solution, by setting the temperature sensor on the transport device, compared with setting the temperature sensor at other positions in the chamber, the temperature value sensed by the temperature sensor is closer to the temperature value on the surface of the battery, the temperature detection result is more accurate, and it is more beneficial to improve the detection rate of the self-discharge test.

[0034] In one embodiment, the transport device includes a box body and at least one bearing plate, and at least one bearing plate is stacked and configured to carry the battery; and the bearing plate is slidably connected to the box body.

[0035] In the above solution, by making the transport device include at least one layer of bearing plates, the number of batteries that can be transported by the transport device each time can be increased. At the same time, by making the bearing plates slidably connected to the inside of the box body, it is convenient to load the batteries onto the transport device or unload the batteries from the transport device.

[0036] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented in accordance with the content of the description. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. Description of the Drawings

[0037] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0038] Figure 1 is a schematic structural diagram of a battery temperature control device provided by an embodiment of the present application;

[0039] Figure 2 is Figure 1 a schematic structural diagram after the cavity door of the shown battery temperature control device is opened;

[0040] Figure 3 is a schematic structural diagram of a transport device provided by an embodiment of the present application;

[0041] Figure 4 is Figure 3 a schematic structural diagram of the bearing plate in the shown transport device being moved out of the box body;

[0042] Figure 5 is a schematic diagram of the process of the transport device provided by an embodiment of the present application loading batteries.

[0043] Description of the Reference Numerals

[0044] 100 Battery;

[0045] 10 Battery temperature control device; 11 Cavity; 111 Chamber; 112 Cavity door; 12 Heating component; 121 Heating element; 122 Pressure source; 13 First gas source; 14 Second gas source; 15 Air extraction component;

[0046] 20 Transport device; 21 Box body; 22 Bearing plate; 23 Partition. Detailed Embodiments

[0047] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above description of the drawings are intended to cover non-exclusive inclusion.

[0049] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0050] Referring to "embodiments" herein means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0051] In the description of the embodiments of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0052] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0053] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0054] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "coupling", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0055] The process of self-discharge testing of lithium batteries usually requires high-temperature reaction acceleration and room-temperature placement to ensure that defects inside the lithium batteries can be accurately detected. In related technologies, multiple workshops with different temperatures such as high-temperature workshops and low-temperature workshops are usually set up. Then, the batteries are transported to workshops with different temperatures by a logistics trolley and placed on the static shelves in the workshops. After the test is completed, they are taken off the static shelves and transported to other workshops again by the material trolley.

[0056] However, in this solution, the cycle time of self-discharge testing of lithium batteries is relatively long, and each workshop is immovable, occupying a large area and requiring a relatively high land cost. Moreover, it is necessary to set up static shelves and tracks for the operation of the material trolley in the workshop, resulting in a high cost. At the same time, there are many temperature changes in the self-discharge testing of lithium batteries (such as high temperature, low temperature, room temperature), and the required environmental temperature changes frequently, which places great pressure on the construction of the workshop and it is difficult to accurately monitor the temperature of the workshop. In addition, this solution uses an external device to pressurize to keep each workshop in a pressurized state, consuming a lot of physical resources and having a high equipment cost.

[0057] Based on this, the embodiments of the present application provide a battery temperature control device, which can achieve different temperature changes through one cavity, meeting the requirements for different temperatures during the self-discharge testing of batteries; reducing the number of cavities, lowering the cost, reducing the floor area of the battery temperature control device, and improving the space utilization rate of the cavity; and omitting the process of transporting the battery to cavities with different temperatures, improving the self-discharge testing efficiency and shortening the testing cycle.

[0058] The present application will be described in detail below with reference to the accompanying drawings and embodiments.

[0059] Please refer to Figures 1 to 2 , Figure 1 which is a schematic structural diagram of a battery temperature control device provided by an embodiment of the present application; Figure 2 is Figure 1 a schematic structural diagram after the cavity door of the battery temperature control device shown is opened. In this embodiment, a battery temperature control device 10 is provided, and the battery temperature control device 10 is configured to control the temperature of the battery 100 (see below Figure 5 ) during the self-discharge test of the battery 100. The battery temperature control device 10 includes a cavity 11, a heating component 12, a cooling component, and a constant temperature component. The cavity 11 has a chamber 111, and the chamber 111 is configured to accommodate the battery 100. The heating component 12 is configured to heat the chamber 111. The cooling component is configured to cool the heated chamber 111. The constant temperature component is configured to keep the temperature in the cooled chamber 111 within a first temperature range.

[0060] Among them, the battery 100 includes, but is not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium-metal batteries, sodium-metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, and lead-acid batteries. During the self-discharge test of the battery 100, the battery 100 is placed in the battery temperature control device 10 to control the temperature of the surface of the battery 100 through the battery temperature control device 10, so that the battery 100 undergoes high-temperature acceleration reactions and normal-temperature static rests during the self-discharge test.

[0061] The cavity 11 includes a top wall, a side wall, and a bottom wall, and the top wall, side wall, and bottom wall of the cavity 11 enclose to form the chamber 111. The heating component 12 is used to generate heat during operation to heat the chamber 111, so that the temperature in the chamber 111 is higher than the room temperature, and the battery 100 can undergo high-temperature reactions in the chamber 111. The room temperature is the temperature in the chamber 111 under natural environmental conditions. Among them, the heating component 12 can generate heat by being energized; for example, the heating component 12 includes a resistance wire or a resistance mesh, and the resistance wire or the resistance mesh is used to generate heat when energized. Of course, the heating component 12 can also generate heat by itself; for example, the heating component 12 includes a conveying pipeline and a high-temperature liquid or gas; the high-temperature liquid or gas flows through the infusion pipeline to conduct heat into the chamber 111. Among them, the infusion pipeline can be a pipeline structure independent of the cavity 11, or a channel opened in the side wall, bottom wall, and / or top wall of the cavity 11.

[0062] The heating component 12 can specifically heat the temperature value in the chamber 111 to a third temperature range, and then stop heating. Alternatively, the heating component 12 can heat the temperature value in the chamber 111 to a third temperature range, and maintain the temperature value in the chamber 111 in the third temperature range within a first preset time, and then stop heating. The third temperature range is greater than the first temperature range. The first preset time can be set according to actual needs.

[0063] The cooling component starts working after the heating component 12 finishes heating, that is, after the battery 100 completes the high temperature test, to reduce the temperature in the chamber 111. After the temperature in the chamber 111 drops to a fourth temperature range, the cooling component stops working. The fourth temperature range is less than the third temperature range, and the fourth temperature range can be greater than or equal to the first temperature range. The cooling component can be a low-temperature liquid or gas to take away the heat in the chamber 111 to achieve cooling.

[0064] The constant temperature component is used to start working after the cooling component lowers the temperature in the chamber 111 to the fourth temperature range, and keeps the temperature in the chamber 111 in the first temperature range to achieve normal temperature standing of the battery 100. Among them, the standing involved in this application is carried out at room temperature; normal temperature, that is, the first temperature range can be 20 degrees Celsius to 30 degrees Celsius. Among them, the temperature in the chamber 111 can be maintained at 25 degrees Celsius. Of course, in addition to 25 degrees Celsius, the temperature in the chamber 111 can also be maintained at 22 degrees Celsius, 23 degrees Celsius, 24 degrees Celsius, 26 degrees Celsius, 27 degrees Celsius or 28 degrees Celsius and other applicable temperatures.

[0065] Here, the reason for choosing to stand at room temperature is that when standing at high temperature, although the polarization time of the battery 100 is shorter, the energy consumed is higher; while when standing at low temperature, although the energy consumed is relatively less, the polarization time of the battery 100 is longer. Compared with standing at high temperature and low temperature, standing at room temperature has moderate energy consumption and moderate polarization time, has better comprehensive effect, and is not so demanding on the detection conditions.

[0066] The purpose of standing the battery 100 at room temperature is to wait for the polarization of the battery 100 to disappear, so as to make the test result more accurate. The standing time of the battery 100 may be 2 days. Of course, the specific standing time is not limited to the above, and may also be 3 days, 4 days, 5 days, 6 days or 7 days.

[0067] The battery temperature control device 10 provided in this embodiment includes a cavity 11, a heating component 12, a cooling component, and a constant temperature component; the cavity 11 has a chamber 111, and the chamber 111 can accommodate the battery 100 during the self-discharge test of the battery 100; and the chamber 111 can be heated by the heating component 12 to create a high-temperature environment inside the chamber 111, so that the battery 100 can undergo a high-temperature reaction inside the chamber 111. In addition, after the self-discharge heating test, the chamber 111 can be cooled by the cooling component to achieve rapid cooling of the chamber 111. Moreover, after the temperature inside the chamber 111 is reduced, the constant temperature component can be used to control the temperature inside the chamber 111 to be maintained within a first temperature range, so as to achieve normal-temperature static placement of the battery 100 during the self-discharge test of the battery 100. Compared with the solution of setting multiple cavities 11 with different temperatures and transporting the battery 100 to the cavities 11 with different temperatures respectively during the self-discharge test of the battery 100, the battery temperature control device 10 can achieve high temperature in the chamber 111 through the heating component 12, achieve low temperature in the chamber 111 through the cooling component, and achieve constant temperature in the chamber 111 through the constant temperature component, so as to change the temperature inside the chamber 111 through these three components, thereby combining multiple cavities 11 with different temperatures into one cavity 11 that can achieve different temperature changes, that is, reducing the number of cavities 11, reducing costs, reducing the floor area of the battery temperature control device 10, and improving the space utilization rate of the battery temperature control device 10; and the process of transporting the battery 100 to the cavities 11 with different temperatures is omitted, improving the self-discharge test efficiency and shortening the test cycle. In addition, by using a dedicated heating component 12 to heat the chamber 111, the heating efficiency is improved, and the temperature rise of the chamber 111 can be quickly achieved; and by using a dedicated cooling component to cool the chamber 111, the cooling efficiency is improved, and the cooling can be quickly achieved, further improving the self-discharge test efficiency and shortening the test cycle.

[0068] In one embodiment, in combination with Figure 2 , the heating component 12 includes a heating element 121 and a pressure source 122; the heating element 121 is provided on the inner wall surface of the cavity 11 and heats the chamber 111. The pressure source 122 is provided outside the chamber 111 and is communicated with the chamber 111, and the pressure source 122 is configured to deliver a gas with a first preset pressure into the chamber 111; the first preset pressure is greater than the initial pressure inside the chamber 111.

[0069] Among them, the heating element 121 may include a resistance wire and / or a resistance mesh. At least one limiting groove may be provided on the inner wall surface of the cavity 11, and the heating element 121 may be embedded in the limiting groove of the cavity 11 to be fixedly connected to the cavity 11. Of course, the heating element 121 may also be fixed to the inner wall surface of the cavity 11 by fixing members such as screws or studs.

[0070] Of course, in other embodiments, the heating element 121 may also include a delivery pipeline and high-temperature liquid or gas; the high-temperature liquid or gas flows through the infusion pipeline to conduct heat into the setting chamber 111. The infusion pipeline may be a pipeline structure independent of the cavity 11, or a channel opened in the side wall, bottom wall, and / or top wall of the cavity 11.

[0071] The pressure source 122 may be a pneumatic tank for delivering high-pressure gas into the chamber 111 during the heating process of the heating element 121, so that the chamber 111 is in a high-temperature and high-pressure environment. When the battery 100 is placed in the chamber 111 for high-temperature testing, since the battery 100 is already self-sealed, the pressurized gas inside the chamber 111 can act as an external pressure to squeeze the battery 100, realizing full pressurization during the self-discharge high-temperature test process and improving the detection rate of the self-discharge test. The initial pressure in the chamber 111 refers to the pressure in the chamber 111 under natural environment.

[0072] In this embodiment, by arranging the heating element 121 on the inner wall surface of the cavity 11, compared with arranging it on the outside of the cavity 11, the temperature can be raised quickly, improving the heating efficiency; and compared with arranging the heating element 121 at other spatial positions in the chamber 111, the occupancy rate of the space in the chamber 111 can be reduced. In addition, by delivering gas with a first preset pressure into the chamber 111 through the pressure source 122, the pressurization of the chamber 111 can be quickly realized to achieve high-temperature pressurization in the chamber 111, improving the detection rate of the self-discharge test of the battery 100. Moreover, by using the heating method of the heating element 121 and the pressure source 122 to deliver pressurized gas, the heating method is relatively simple, and the gas with the first preset pressure can be used as a heat conduction medium to quickly and evenly conduct the heat generated by the heating element 121 to all positions of the chamber 111, which can improve the heating efficiency in the closed chamber 111.

[0073] In one embodiment, the heating element 121 includes a heating plate that covers all the inner wall surfaces of the cavity 11.

[0074] The heating plate is plate-shaped and can be bonded or connected to the cavity 11 through other fixing parts such as screws. The heating plate can be directly attached to the inner wall surface of the cavity 11; or a medium layer can be provided between the heating plate and the inner wall surface of the cavity 11. The medium layer can play a role in isolation, insulation, and / or heat preservation.

[0075] In this embodiment, by making the heating element 121 include a heating plate, compared with a heating block, the heat generated by the heating plate has a better heat dissipation effect to the outside, which is more conducive to heating the gas near the heating element 121, and the heating efficiency is higher. In addition, by making the heating plate cover all the inner wall surfaces of the cavity 11, the heating efficiency can be further effectively improved, and the heating uniformity of the gas in the chamber 111 by the heating element 121 can be improved, and the risk of local high temperature in the chamber 111 can be reduced.

[0076] In one embodiment, in combination with Figure 1 or Figure 2 , the temperature reduction component includes a first gas source 13. The first gas source 13 is arranged outside the chamber 111 and communicated with the chamber 111, and the first gas source 13 is configured to convey gas within a second temperature range into the heated chamber 111, and the second temperature range is less than the temperature in the heated chamber 111.

[0077] Among them, the first gas source 13 can be a gas tank or gas cylinder filled with gas within the second temperature range. The first gas source 13 can be arranged on one side of the cavity 11, and the first gas source 13 can be communicated with the chamber 111 through a ventilation pipeline. The temperature in the heated chamber 111 refers to the temperature in the chamber 111 after the heating by the heating component 12 is completed. In some embodiments, the temperature in the heated chamber 111 is the third temperature range. After the heating component 12 stops heating, the first gas source 13 is opened to convey gas within the second temperature range into the chamber 111. Among them, the second temperature range can be less than the initial temperature in the chamber 111 to facilitate the rapid temperature reduction of the chamber 111.

[0078] In this embodiment, by directly conveying low-temperature gas into the chamber 111 using the first gas source 13, the temperature in the chamber 111 can be rapidly reduced, the temperature reduction rate is increased, and the cycle of the self-discharge test is shortened. At the same time, since the first gas source 13 is arranged outside the chamber 111, the first gas source 13 does not occupy the space inside the chamber 111, and the battery temperature control device 10 can perform temperature control on more batteries 100 at one time.

[0079] Of course, in other embodiments, the temperature reduction component can also include a cooling pipeline and a coolant. The cooling pipeline can be arranged on the side wall, bottom wall, and / or top wall of the cavity 11. The coolant flows through the cooling pipeline and takes away the heat in the chamber 111 to achieve the temperature reduction of the chamber 111. Among them, the coolant can be cold water or liquid nitrogen. The cooling pipeline can be independently arranged on the inner wall surface or outer wall surface of the cavity 11. The cooling pipeline can also be a channel opened in the side wall, top wall, and / or bottom wall of the cavity 11.

[0080] In one embodiment, the pressure of the gas within the second temperature range is greater than the initial pressure in the chamber 111.

[0081] Among them, the pressure of the gas in the second temperature range may be the same as the first preset pressure. Of course, the pressure of the gas in the second temperature range may also be lower or higher than the first preset pressure. The specific pressure values of the gas in the second temperature range can be set according to actual needs. For example, they can be set according to the model, type, etc. of the battery 100. In a specific embodiment, the first gas source 13 may contain the gas in the second temperature range after being pressurized.

[0082] In this embodiment, by making the gas in the second temperature range a pressurized gas, the chamber 111 can still be in a pressurized state during the cooling process, so as to improve the detection rate of the self-discharge test; and there is no need to additionally install a pressurizing device for pressurizing the gas in the second temperature range, saving space and cost.

[0083] In one embodiment, the constant temperature component includes a second gas source 14. The second gas source 14 is arranged outside the chamber 111 and is connected to the chamber 111, and the second gas source 14 is configured to transport the gas in the first temperature range into the cooled chamber 111; among them, the pressure of the gas in the first temperature range is greater than the initial pressure in the chamber 111; the first temperature range is less than the temperature in the heated chamber 111 and greater than or equal to the second temperature range.

[0084] Among them, the second gas source 14 may be a gas tank or gas cylinder filled with the gas in the first temperature range. The gas in the first temperature range may be a pressurized gas, and the specific pressure value of the pressurized gas can be set according to actual needs. For example, it can be selected and set according to the model or type of the battery 100. The pressure of the gas in the first temperature range may be the same as the pressure of the gas in the second temperature range. The second gas source 14 may be arranged on one side of the cavity 11, and the second gas source 14 may be connected to the chamber 111 through a ventilation pipeline. After the temperature in the chamber 111 drops to the fourth temperature range, the first gas source 13 is closed, that is, the transportation of the gas in the second temperature range into the chamber 111 is stopped, and the second gas source 14 is opened to transport the gas in the first temperature range into the chamber 111. In some embodiments, the gas in the first temperature range may be normal temperature gas.

[0085] In a specific embodiment, during the process of the heating element 121 heating the chamber 111, the pressure source 122 transports the gas with the first preset pressure into the chamber 111; and the gas in the first temperature range and the gas in the second temperature range are both pressurized gases; thus, during the self-discharge test of the battery 100, the pressurized gas inside the cavity 11 can be used as an external pressure to squeeze the battery 100, realizing full-pressure on the battery 100 during the self-discharge test and improving the detection rate of the self-discharge test.

[0086] In this embodiment, after the temperature in the chamber 111 is reduced to the fourth temperature range, the gas in the first temperature range is directly delivered into the chamber 111 by the second gas source 14, so that the temperature in the chamber 111 can be maintained within the first temperature range, enabling the battery 100 to stand still for a preset time in this normal temperature state for subsequent testing processes. Moreover, directly delivering the gas in the first temperature range is simple and convenient in operation, which can shorten the self-discharge test cycle; and compared with setting other heat preservation devices, the temperature fluctuation in the chamber 111 is smaller, and the accuracy of the self-discharge test result is higher. At the same time, by making the pressure of the gas in the first temperature range greater than the initial pressure in the chamber 111, the chamber 111 can be in a normal temperature pressurized state, so that the battery 100 remains in a pressurized state during the normal temperature standing process of the battery 100, thereby improving the detection rate of the self-discharge test; and there is no need to additionally install a pressurizing device for pressurizing the gas in the first temperature range, saving space and cost.

[0087] Of course, in other embodiments, the constant temperature component may also include a constant temperature pipeline and a constant temperature liquid. The constant temperature pipeline can be arranged on the side wall, bottom wall and / or top wall of the cavity 11, and the constant temperature liquid flows through the constant temperature pipeline to maintain the constant temperature state in the chamber 111. Among them, the constant temperature liquid can be constant temperature water or constant temperature gas. The constant temperature pipeline can be independently arranged on the inner wall surface or outer wall surface of the cavity 11. The constant temperature pipeline can also be a channel opened in the side wall, top wall and / or bottom wall of the cavity 11.

[0088] In one embodiment, in combination with Figure 1 , the battery temperature control device 10 further includes an air extraction component 15. The air extraction component 15 is arranged outside the chamber 111 and is communicated with the chamber 111, and the air extraction component 15 is configured to extract the gas in the chamber 111 when delivering the gas in the first temperature range or the second temperature range into the chamber 111.

[0089] Among them, the air extraction component 15 can include a negative pressure suction device; the negative pressure suction device is communicated with the chamber 111 to extract the gas in the chamber 111 through the pressure difference. Among them, after the first gas source 13 is turned on and the gas in the second temperature range is delivered into the chamber 111, the negative pressure suction device can be synchronously turned on to recover the hot and dry gas in the chamber 111, realizing the cold and hot gas exchange in the chamber 111 and facilitating the rapid cooling in the chamber 111. At the same time, after the second gas source 14 is turned on and the gas in the first temperature range is delivered into the chamber 111, the negative pressure suction device can be synchronously used to suck the gas in the chamber 111 to ensure the gas circulation in the chamber 111 and keep the chamber 111 in a pressurized state all the time. Among them, during the process of delivering the gas in the second temperature range and the gas in the first temperature range, the negative pressure suction device can always be in a working state to suck the gas in the chamber 111.

[0090] Among them, the connection port of the negative pressure suction device and the chamber 111 can be relatively arranged on both sides of the chamber 111 with respect to the intake end involved below; this can reduce the suction resistance of the negative pressure suction device and save energy consumption.

[0091] In this embodiment, during the process of delivering the gas in the second temperature range, the gas in the chamber 111 is simultaneously sucked by the air extraction assembly 15. In this way, the high-temperature gas can be cooled by the low-temperature gas, and the high-temperature dry gas in the chamber 111 can be recovered by suction, realizing the replacement of the hot and cold gases in the chamber 111, facilitating the rapid cooling in the chamber 111, effectively shortening the temperature change period in the chamber 111, and further shortening the self-discharge test period. In addition, during the process of delivering the gas in the first temperature range, the gas in the chamber 111 is simultaneously sucked by the air extraction assembly 15 to realize the gas circulation in the chamber 111, and the pressurized environment in the chamber 111 is maintained by the gas in the first temperature range to improve the detection rate of the self-discharge test.

[0092] In one embodiment, the battery temperature control device 10 further includes a temperature sensor (not shown in the figure), and the temperature sensor is configured to sense and display the temperature value in the chamber 111; the heating assembly 12 is configured to heat the temperature value in the chamber 111 to the third temperature range; the first gas source 13 is configured to deliver the gas in the second temperature range into the chamber 111 when the time for the temperature value in the chamber 111 to reach the third temperature range is not less than the first preset time. The second gas source 14 is configured to deliver the gas in the first temperature range into the chamber 111 when the temperature value in the chamber 111 drops from the third temperature range to the fourth temperature range; wherein, the fourth temperature range is greater than or equal to the first temperature range.

[0093] In a specific embodiment, the fourth temperature range is equal to the first temperature range. Of course, if the fourth temperature range is greater than the first temperature range, when the gas in the first temperature range is introduced, the gas in the first temperature range can further cool the temperature in the chamber 111, and cooperate with the air extraction assembly 15 to perform hot and cold gas exchange in the chamber 111, and finally keep the temperature in the chamber 111 within the first temperature range.

[0094] Among them, the temperature sensor includes a temperature transducer and a display. The temperature transducer can be disposed at any position within the chamber 111, or on a structure for carrying the battery 100 (e.g., the transport device 20 hereinafter), for sensing the temperature value within the chamber 111. The display is electrically connected to the temperature transducer, and is used for displaying in real time the temperature value and time sensed by the temperature transducer. When the time for the heating assembly 12 to heat the temperature value within the chamber 111 to reach the third temperature range is not less than a first preset time, the user can manually activate the first gas source 13 according to the displayed temperature value and time, so as to convey a gas within the second temperature range into the chamber 111 through the first gas source 13. When the temperature value within the chamber 111 decreases from the third temperature range to the fourth temperature range, the user can manually activate the second gas source 14 according to the displayed temperature value and time, so as to convey a gas within the first temperature range into the chamber 111 through the second gas source 14.

[0095] In this embodiment, by providing the temperature sensor, the temperature value within the chamber 111 can be monitored and displayed in real time, reducing the influence of test result deviation caused by uneven temperature during the test process. At the same time, the first gas source 13 and the second gas source 14 can also convey a gas within the first temperature range or the second temperature range into the chamber 111 in a timely manner according to the sensed temperature value, so as to achieve a rapid change in the temperature within the chamber 111. In addition, by conveying a gas within the second temperature range into the chamber 111 through the first gas source 13 when the time for the temperature value within the chamber 111 to reach the third temperature range is not less than a first preset time, the battery 100 can undergo a sufficient high-temperature reaction. Moreover, when the temperature value within the chamber 111 decreases to the fourth temperature range and then a gas within the first temperature range is conveyed into the chamber 111 through the second gas source 14, compared with directly conveying a gas within the first temperature range into the chamber 111 when the time for the temperature value within the chamber 111 to reach the third temperature range is not less than a first preset time, since the second temperature range is smaller than the first temperature range, the cooling efficiency using the second temperature range for cooling is higher, and the test cycle can be further shortened.

[0096] In one embodiment, the battery temperature control device 10 further includes a temperature sensor (not shown in the figure) and a controller (not shown in the figure). The temperature sensor is configured to sense the temperature value within the chamber 111; the controller is electrically connected to the temperature sensor, and the controller controls the first gas source 13 to convey a gas within the second temperature range into the chamber 111 in response to the time for the temperature value within the chamber 111 to reach the third temperature range being not less than a first preset time; and the controller controls the second gas source 14 to convey a gas within the first temperature range into the chamber 111 in response to the temperature within the chamber 111 decreasing from the third temperature range to the fourth temperature range; wherein, the fourth temperature range is greater than or equal to the first temperature range.

[0097] Among them, different from the previous embodiment, the temperature sensor may not include a display. The controller automatically turns on or off the first gas source 13 or the second gas source 14 based on the temperature value sensed by the temperature sensor. In a specific embodiment, an electromagnetic valve (not shown in the figure) may be respectively provided in the air pipelines of the pressure source 122, the first gas source 13, and the second gas source 14. The controller is electrically connected to each electromagnetic valve respectively, and the controller controls the connection or disconnection of the pressure source 122, the first gas source 13, and the second gas source 14 with the chamber 111 by controlling the corresponding electromagnetic valve. Of course, if the pressure source 122, the first gas source 13, and the second gas source 14 share a three-way electromagnetic valve, the controller is electrically connected to the three-way electromagnetic valve to control the connection of one of the pressure source 122, the first gas source 13, and the second gas source 14 with the chamber 111 by controlling the three-way electromagnetic valve.

[0098] In this embodiment, compared with the previous embodiment, by providing a controller electrically connected to the temperature sensor and making the time for the controller to respond to the temperature value in the chamber 111 reaching the third temperature range not less than the first preset time, the first gas source 13 is automatically controlled to turn on to deliver the gas in the second temperature range into the chamber 111, so as to quickly reduce the temperature in the chamber 111 and realize a rapid change in the temperature in the chamber 111. Moreover, by making the controller respond to the temperature in the chamber 111 decreasing from the third temperature range to the fourth temperature range and automatically controlling the second gas source 14 to turn on to deliver the gas in the first temperature range into the chamber 111, the risk of the temperature in the chamber 111 being too low due to the slow delivery of the gas in the first temperature range can be reduced. In addition, by controlling the turning on and off of the first gas source 13 and the second gas source 14 by the controller, compared with manually turning on or off the first gas source 13 and the second gas source 14, the degree of automation is higher and the temperature regulation is more accurate.

[0099] In one embodiment, at least one or more of the gas with the first preset pressure, the gas in the first temperature range, and the gas in the second temperature range is a dry gas.

[0100] Among them, the gas with the first preset pressure, the gas in the first temperature range, and the gas in the second temperature range can all be dry gases. The relative humidity of the dry gas is not greater than 1.0%RH; preferably, the relative humidity of the dry gas is not greater than 0.5%RH. The relative humidity refers to the percentage of the water vapor pressure in the gas to the saturated water vapor pressure at the same temperature, or the ratio of the absolute humidity of the moist air to the maximum absolute humidity that can be reached at the same temperature, and can also be expressed as the ratio of the partial pressure of water vapor in the moist air to the saturated pressure of water at the same temperature.

[0101] In this embodiment, by making one or more of the gases delivered into the chamber 111 dry gases, the risk of condensation in the chamber 111 can be reduced, and during the self-discharge test of the battery 100, the risk of the battery 100 condensing in the chamber 111 can be reduced.

[0102] In one embodiment, the cavity 11 further has an air inlet end communicating with the chamber 111; at least one or more of the pressure source 122, the first gas source 13, and the second gas source 14 are respectively connected to the air inlet end to communicate with the chamber 111 through the air inlet end.

[0103] Among them, the air inlet end can be an air inlet opened on the side wall of the cavity 11. The number of air inlet ends can be one, and the pressure source 122, the first gas source 13, and the second gas source 14 communicate with the chamber 111 through the same air inlet end. In this embodiment, a three-way solenoid valve can be provided on the gas pipelines of the pressure source 122, the first gas source 13, and the second gas source 14 to control the three-way solenoid valve through a controller to enable one of the pressure source 122, the first gas source 13, and the second gas source 14 to communicate with the chamber 111.

[0104] Of course, the number of air inlet ends can also be two or three, and the pressure source 122, the first gas source 13, and the second gas source 14 can respectively communicate with the chamber 111 through one air inlet end. Or, any two of the pressure source 122, the first gas source 13, and the second gas source 14 share one air inlet end, and the other communicates with the chamber 111 through the other air inlet end among the two air inlet ends.

[0105] In this embodiment, by making the pressure source 122, the first gas source 13, and the second gas source 14 communicate with the chamber 111 through the same air inlet end, the sealing performance of the chamber 111 can be improved, which is beneficial to realizing a rapid change in the temperature in the chamber 111; and the pressure source 122, the first gas source 13, and the second gas source 14 can share one main pipeline, simplifying the structure and reducing the cost.

[0106] In one embodiment, refer to Figure 2 , the cavity 11 further has a feed port and a chamber door 112; the feed port is configured to allow the battery 100 to enter and exit the chamber 111; the chamber door 112 is configured to open or close the feed port.

[0107] Among them, the feed port can be a notch opened on one of the side walls of the cavity 11. Or, the side wall of the cavity 11 has opposite first and second side edges along the circumferential direction of the cavity 11, the first and second side edges are opposite and spaced apart along the circumferential direction of the cavity 11, and the first side edge, the second side edge, the top wall of the cavity 11, and the bottom wall of the cavity 11 enclose to form the feed port. The chamber door 112 is rotatably or slidably connected to the cavity 11 to open or close the feed port.

[0108] In this embodiment, by providing a feed inlet and a chamber door 112, and enabling the chamber door 112 to open or close the feed inlet; in this way, the transport device 20 can smoothly enter and exit the chamber 111 through the feed inlet; and after the transport device 20 enters or exits the chamber 111, the feed inlet can be closed by the chamber door 112 to seal the chamber 111, improve the sealing performance of the chamber 111, and facilitate the rapid change of the temperature inside the chamber 111; at the same time, it can reduce the risk of contamination of the chamber 111 by external dust, particles and other pollutants; and reduce the risk of weathering of the heating element 121 inside the chamber 111 due to long-term exposure.

[0109] See Figures 3 to 5 , Figure 3 is a schematic structural diagram of a transport device provided in an embodiment of the present application; Figure 4 is Figure 3 a schematic structural diagram of the carrier plate in the shown transport device being removed from the box body; Figure 5 is a schematic diagram of the process of the transport device provided in an embodiment of the present application for loading and unloading batteries. In one embodiment, a battery self-discharge test system is provided, and the battery self-discharge test system includes a battery temperature control device 10 and at least one transport device 20. The battery temperature control device 10 is configured to control the temperature of the battery 100 during the self-discharge test of the battery 100. The battery temperature control device 10 is the battery temperature control device 10 provided in any of the above embodiments, and its specific structure and function can be referred to the relevant descriptions above. At least one transport device 20 is configured to carry and transport the battery 100 into the chamber 111 of the battery temperature control device 10.

[0110] The transport device 20 can be any movable trolley, such as a goods trolley. The number of transport devices 20 can be designed according to the volume size inside the chamber 111. The height of the transport device 20 can be set according to the height of the feed inlet and the height inside the chamber 111. Among them, after the transport device 20 transports the battery 100 into the chamber 111, the transport device 20 stays in the chamber 111 together with the battery 100 until the battery 100 completes the high-temperature reaction and the first normal-temperature static placement, and then is removed from the chamber 111 together with the battery 100 to carry out the subsequent test process.

[0111] In this embodiment, the transport device 20 is used to carry and transport the battery 100 into the chamber 111 of the battery temperature control device 10, so that the battery 100 undergoes a high-temperature reaction acceleration and the first normal-temperature placement in the chamber 111; in this way, the transport device 20 can directly carry the battery 100 in the chamber 111, and the static shelf for carrying the battery 100 in the chamber 11 can be omitted; at the same time, the transport device 20 can directly run on the bottom wall of the chamber 11, omitting the track specifically used for the operation of the logistics trolley in the chamber 11, effectively reducing the cost.

[0112] In one embodiment, the battery temperature control device 10 includes at least one temperature sensor. The at least one temperature sensor is respectively disposed on the transport device 20, and one temperature sensor is disposed on one transport device 20.

[0113] The temperature sensor is the temperature sensor involved in the above related embodiments. In this embodiment, specifically, the temperature sensor is disposed on the transport device 20, and the number of temperature sensors is the same as that of the transport devices 20.

[0114] In this embodiment, by disposing the temperature sensor on the transport device 20, compared with disposing the temperature sensor at other positions in the chamber 111, the temperature value sensed by the temperature sensor is closer to the temperature value on the surface of the battery 100, the temperature detection result is more accurate, and it is more conducive to improving the detection rate of the self-discharge test.

[0115] In one embodiment, referring to Figure 3 and Figure 4 , the transport device 20 includes a box body 21 and at least one carrier plate 22. The at least one carrier plate 22 is stacked, and these carrier plates 22 are configured to carry the battery 100; and the carrier plate 22 is slidably connected to the inside of the box body 21.

[0116] Among them, the number of the carrier plates 22 can be one, two or more. Each carrier plate 22 is configured to carry the battery 100, and a plurality of carrier plates 22 are stacked. Among them, each carrier plate 22 can carry a plurality of batteries 100 to increase the capacity of the carrier plate 22. The plurality of batteries 100 can be distributed in a matrix on the carrier plate 22.

[0117] A plurality of sliding grooves can be provided on the inner wall surface of the side wall of the box body 21 along the height direction Z of the box body 21. The plurality of sliding grooves are spaced apart; one sliding groove corresponds to one carrier plate 22. The carrier plate 22 is connected to the sliding groove and can slide along the extending direction of the sliding groove to slide out of or into the box body 21. Of course, a plurality of grids 23 can also be provided on the inner wall surface of the side wall of the box body 21 along the height direction Z of the box body 21. The plurality of grids 23 are spaced apart; one grid 23 corresponds to one carrier plate 22. The carrier plate 22 is carried on the grid 23 and can move relative to the grid 23 on the surface of the grid 23; this embodiment is similar to the setting method of multiple layers of storage plates in a refrigerator inside the refrigerator.

[0118] In this embodiment, by making the transport device 20 include at least one layer of carrier plates 22, the number of batteries 100 that can be transported by the transport device 20 each time can be increased. At the same time, by making the carrier plate 22 slidably connected to the inside of the box body 21, it is convenient to load the battery 100 onto the transport device 20 or unload the battery 100 from the transport device 20.

[0119] During the process of performing self-discharge testing on the battery 100 using the battery self-discharge testing system, the transport device 20 is used to load the battery 100. The transport device 20 is sent into the chamber 111 through the feed port, and the chamber door 112 is closed to seal the chamber 111. Then, the heating element 121 is started to heat, and simultaneously the pressure source 122 is turned on to deliver gas at a first preset pressure into the chamber 111, thereby heating and pressurizing the battery 100 in the chamber 111. After the self-discharge heating test is completed, the heating element 121 and the pressure source 122 are turned off, and the air extraction assembly 15 is turned on to suck and recover the hot and dry gas. At the same time, the first gas source 13 is turned on to deliver pressurized gas within a second temperature range into the chamber 111 to achieve rapid cooling within the sealed chamber 111. After the temperature of the battery 100 drops to the fourth temperature range, the first gas source 13 is turned off, and the second gas source 14 is turned on to deliver pressurized gas within a first temperature range into the chamber 111 to achieve the first normal temperature pressurized static state of the battery 100 in the chamber 111 for a time t1.

[0120] After the static state is completed, the pressure in the chamber 111 is released, and the first open-circuit voltage test of the battery 100 is performed. The first open-circuit voltage value is denoted as OCV1. After the test is completed, the transport device 20 is removed from the chamber 111, and the battery 100 is transferred to the normal temperature shelf and left to stand for a time t2. Then, the second open-circuit voltage test of the battery 100 is performed, and the second open-circuit voltage value is denoted as OCV2. Among them, the second static state of the battery 100 is to allow the voltage of the battery 100 to fully rebound so as to make the detection result more accurate.

[0121] It should be noted that the voltage of the battery 100 with qualified self-discharge will have a certain rebound, that is, the voltage will gradually increase. However, the voltage of the battery 100 with unqualified self-discharge will not rebound or the amount of rebound is very small, and even shows a downward trend in voltage. Finally, the quality of the self-discharge of the battery 100 is determined by judging the voltage reduction change rate K value. Among them, K = (OCV1 - OCV2) / t2.

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery temperature control device, characterized in that: The device is configured to control the temperature of a battery during a battery self-discharge test, the battery temperature control device comprising: A cavity having a chamber configured to accommodate the battery; the cavity also having a feed port and a cavity door; the feed port is configured to allow the battery to enter and exit the cavity; the cavity door is configured to open or close the feed port; a heating assembly configured to heat the chamber; A cooling component, configured to cool the heated chamber; The constant temperature component is configured to keep the temperature in the chamber after cooling down within a first temperature range.

2. The battery temperature control device according to claim 1, characterized in that: The heating assembly comprises: A heating element, disposed on the inner wall surface of the cavity and heating the cavity; The pressure source is disposed outside the chamber and communicated with the chamber, and is configured to deliver gas of a first preset pressure into the chamber; the first preset pressure is greater than an initial pressure in the chamber.

3. The battery temperature control device according to claim 2, characterized in that: The heating element comprises a heating plate, and the heating plate covers all inner wall surfaces of the cavity.

4. The battery temperature control device according to any one of claims 1 to 3, characterized in that: The cooling component comprises: The first gas source is disposed outside the chamber and communicated with the chamber, and is configured to deliver gas in a second temperature range into the heated chamber, wherein the second temperature range is lower than the temperature inside the heated chamber.

5. The battery temperature control device according to claim 4, characterized in that: The pressure of the gas in the second temperature range is greater than the initial pressure in the chamber.

6. The battery temperature control device according to claim 4, characterized in that: The thermostatic assembly comprises: A second gas source is disposed outside the chamber and connected to the chamber, and is configured to deliver gas in a first temperature range to the chamber after cooling; wherein the pressure of the gas in the first temperature range is greater than the initial pressure in the chamber; and the first temperature range is lower than the temperature in the chamber after heating and greater than or equal to the second temperature range.

7. The battery temperature control device according to claim 6, characterized in that: Also includes: The exhaust component is disposed outside the chamber and communicated with the chamber, and is configured to exhaust the gas in the chamber when the gas in the first temperature range or the gas in the second temperature range is transported into the chamber.

8. The battery temperature control device according to claim 6, characterized in that: Also includes: a temperature sensor configured to sense and display a temperature value in the chamber; The heating component is configured to heat the temperature value in the chamber to a third temperature range; the first gas source is configured to deliver gas in the second temperature range to the chamber when the time for the temperature value in the chamber to reach the third temperature range is not less than a first preset time; the second gas source is configured to lower the temperature value in the chamber from the third temperature range to a fourth temperature range, and deliver gas in the first temperature range to the chamber; wherein the fourth temperature range is greater than or equal to the first temperature range.

9. The battery temperature control device according to claim 6, characterized in that: Also includes: a temperature sensor configured to sense a temperature value in the chamber; a controller electrically connected to the temperature sensor, and in response to the time for the temperature value in the chamber to reach the third temperature range being not less than a first preset time, controlling the first gas source to deliver gas in the second temperature range into the chamber; And in response to the temperature in the chamber decreasing from the third temperature range to a fourth temperature range, controlling the second gas source to deliver gas in the first temperature range into the chamber; wherein the fourth temperature range is greater than or equal to the first temperature range.

10. The battery temperature control device according to claim 6, characterized in that: At least one or more of the gas at the first preset pressure, the gas at the first temperature range, and the gas at the second temperature range is dry gas; and the relative humidity of the dry gas is not greater than 1.0% RH.

11. The battery temperature control device according to claim 6, characterized in that: The cavity also has an air inlet end connected to the chamber; at least one or more of the pressure source, the first air source and the second air source are respectively connected to the air inlet end to communicate with the chamber through the air inlet end.

12. A battery self-discharge test system, characterized in that: include: The battery temperature control device according to any one of claims 1 to 11; At least one transport device is configured to carry and transport the battery into the chamber of the battery temperature control device.

13. The battery self-discharge test system according to claim 12, characterized in that: The battery temperature control device includes at least one temperature sensor. The at least one temperature sensor is respectively arranged on the transport devices, and one temperature sensor is arranged on one transport device.

14. The battery self-discharge test system according to claim 12 or 13, characterized in that: The transport device comprises a box body and at least one carrying plate, wherein the at least one carrying plate is stacked and configured to carry the battery; and the carrying plate is slidably connected in the box body.

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