Battery testing device and battery testing system

Abstract

The embodiment of the invention provides a battery testing device and a battery testing system. The equivalent degree between the battery testing device and an actual use scene can be improved. The battery testing device is applied to the battery testing system. The battery testing device comprises a battery; the first heat source assembly is arranged on the side, close to the earth surface, of the battery and used for simulating the temperature change of the earth surface, and / or the second heat source assembly is arranged on the side, away from the earth surface, of the battery and used for simulating the temperature change of the earth surface. The second heat source assembly is used for simulating temperature changes in a passenger compartment of the vehicle.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of battery technology, and in particular, to a battery testing device and a battery testing system. Background Art

[0002] With the increasing environmental pollution, the new energy industry has attracted more and more attention. In the new energy industry, battery technology is an important factor related to its development. Temperature has a significant impact on the performance of new energy vehicle power batteries. During vehicle charging and driving, the battery will generate a lot of heat. The continuous accumulation of heat will cause the battery capacity and life to decrease to varying degrees. If the heat accumulated in the battery cannot be dissipated in time, it will cause thermal runaway of the battery. In severe cases, it will cause violent combustion and explosion, seriously threatening the lives and property safety of consumers. To this end, the battery test system can be used to simulate the temperature changes of the battery in the whole vehicle to reduce the risk of thermal runaway of the battery.

[0003] Current battery testing devices usually simulate the impact of changes in atmospheric temperature on battery performance. The equivalence between the battery testing device and the battery in actual scenarios is poor, resulting in large deviations in the test results. Therefore, how to improve the equivalence between the battery testing device and the actual usage scenario has become a technical problem that needs to be solved urgently in this field. Summary of the invention

[0004] The embodiments of the present application provide a battery testing device and a battery testing system, which can improve the degree of equivalence between the battery testing device and actual usage scenarios.

[0005] In a first aspect, a battery testing device is provided, which is applied to a battery testing system, and the battery testing device includes: a battery; a first heat source component, which is arranged on a side of the battery close to the ground, and the first heat source component is used to simulate the temperature change of the ground surface; and / or, a second heat source component, which is arranged on a side of the battery away from the ground surface, and the second heat source component is used to simulate the temperature change inside the passenger compartment of the vehicle.

[0006] In an embodiment of the present application, by setting a first heat source component and / or a second heat source component in a battery testing device, the first heat source component is set on a side of the battery close to the ground, and the first heat source component is used to simulate the temperature changes of the ground surface; the second heat source component is set on a side of the battery away from the ground, and the second heat source component is used to simulate the temperature changes inside the passenger compartment of the vehicle. The degree of equivalence between the battery testing device and the actual usage scenario can be effectively improved to simulate the performance changes of the battery in the whole vehicle under actual conditions, while improving the efficiency and qualification rate of product development and shortening the product development cycle.

[0007] In some implementations, the battery testing device further includes a first height adjustment component, which is disposed between the battery and the first heat source component, and is used to adjust the distance between the battery and the first heat source component.

[0008] In an embodiment of the present application, by providing a first height adjustment component in the battery testing device, the first height adjustment component is used to adjust the distance between the battery and the first heat source component, and the first height adjustment component is provided between the battery and the first heat source component, so as to effectively simulate the thermal impact of the surface temperature on batteries in different vehicles, so as to further improve the degree of equivalence between the battery testing device and the actual usage scenarios, so as to simulate the performance changes of the battery in the whole vehicle under actual conditions, and at the same time improve the efficiency and qualification rate of product development and shorten the product development cycle.

[0009] In some embodiments, the first heat source assembly includes a first main body component and a first mounting component, the first mounting component is arranged on a surface of the first main body component away from the center position of the first main body component, and the first main body component is connected to the heat source output device in the battery testing system.

[0010] In an embodiment of the present application, the first heat source assembly includes a first main body component and a first mounting component. The first mounting component is arranged on a surface of the first main body component away from the center position of the first main body component, and the first main body component is connected to a heat source output device in the battery testing system. The first heat source assembly can be lifted and transported by the first mounting component to facilitate the installation and disassembly of the first heat source assembly in the battery testing device.

[0011] In some implementations, the first main body component includes at least two sub-components, and the at least two sub-components are spaced apart along a first direction, and any two adjacent sub-components of the at least two sub-components are connected via a connecting pipe, and the first direction is perpendicular to the thickness direction of the battery testing device.

[0012] In an embodiment of the present application, the first main body component may include at least two sub-components, and the at least two sub-components are arranged at intervals along the first direction. Any two adjacent sub-components of the at least two sub-components are connected by a connecting pipe to facilitate the installation and disassembly of the first heat source component. At the same time, compared with the first main body component with an integral structure, it can significantly save material expenses and reduce experimental testing costs.

[0013] In some embodiments, the second heat source assembly includes: a first box body, wherein a surface of the first box body perpendicular to a first direction is provided with at least one first through hole, and the first through hole is used to connect to a heat source output device in the battery testing system, and the first direction is perpendicular to a thickness direction of the battery testing device.

[0014] In an embodiment of the present application, a first box body is provided in the second heat source assembly, and at least one first through hole is provided on the surface of the first box body perpendicular to the first direction, and the first through hole is used to connect with the heat source output device in the battery testing system, so that the temperature changes inside the passenger compartment of the vehicle can be simulated through the first box body, so as to improve the equivalence between the battery testing device and the actual usage scenario, so as to simulate the performance changes of the battery in the whole vehicle under actual conditions. At the same time, the structural design is simple, which is conducive to reducing processing and manufacturing costs.

[0015] In some embodiments, the battery testing device also includes a second height adjustment device, which is disposed on a surface of the second heat source assembly close to the ground surface, and is used to adjust the distance between the second heat source assembly and the ground surface.

[0016] In an embodiment of the present application, a second height adjustment device is provided in the battery testing device, wherein the second height adjustment device is used to adjust the distance between the second heat source component and the ground surface, and the second height adjustment device is provided on the surface of the second heat source component on the side close to the ground surface. This can effectively simulate the thermal impact of the crew compartment in different vehicles on the battery, improve the degree of equivalence between the battery testing device and the actual usage scenario, so as to simulate the performance changes of the battery in the whole vehicle under actual conditions, while improving the efficiency and qualification rate of product development and shortening the product development cycle.

[0017] In some implementations, at least one second mounting component is further provided on the surface of the first box body perpendicular to the first direction. Thus, in the embodiment of the present application, by providing at least one second mounting component on the surface of the first box body perpendicular to the first direction, the second heat source assembly can be lifted and transported by the second mounting component, so as to facilitate the installation and removal of the second heat source assembly in the battery testing device.

[0018] In some implementations, the first housing includes a first accommodating space, and the second heat source assembly further includes at least one first thermal cycle component, and the at least one first thermal cycle component is disposed in the first accommodating space.

[0019] In an embodiment of the present application, the first box body includes a first accommodating space. By arranging at least one first thermal cycle component in the first accommodating space, the at least one first thermal cycle component can simulate the thermal impact of temperature changes in different areas of the passenger compartment on the battery, thereby realizing the function of equivalent vehicle air conditioning zone temperature control, so as to further improve the degree of equivalence between the battery testing device and the actual usage scenario, so as to simulate the performance changes of the battery in the whole vehicle under actual conditions, and at the same time improve the efficiency and qualification rate of product development and shorten the product development cycle.

[0020] In some embodiments, the second heat source component also includes at least one first moving component, which is connected to the at least one first heat circulation component, and the first moving component corresponds one-to-one with the first heat circulation component so that the first heat circulation component moves in a plane perpendicular to the height direction of the second heat source component.

[0021] In an embodiment of the present application, by setting at least one first movable component in the second heat source component, the first movable component is connected to the at least one first heat cycle component, and the first movable component corresponds to the first heat cycle component one by one. By adjusting the position of the first heat cycle component in the first box of the second heat source component, the thermal impact of temperature changes in different areas of the passenger compartment on the battery can be simulated, and the function of equivalent vehicle air conditioning zone temperature control can be achieved, so as to further improve the degree of equivalence between the battery testing device and the actual usage scenario, so as to simulate the performance changes of the battery in the whole vehicle under actual conditions, while improving the efficiency and qualification rate of product development and shortening the product development cycle.

[0022] In some embodiments, the second heat source component also includes: a flow control valve, a first end of the flow control valve is connected to the first through hole, and the other ends of the flow control valve are respectively connected to the at least one first heat cycle component, and the flow control valve is used to adjust the flow of the fluid flowing to the at least first heat cycle component.

[0023] In an embodiment of the present application, a flow control valve is provided in the second heat source assembly, and the flow control valve is used to adjust the flow rate of the fluid flowing to the at least first thermal cycle component. The first end of the flow control valve is connected to the first through hole, and the other ends of the flow control valve are respectively connected to the at least one first thermal cycle component. That is, the flow control valve can adjust the flow rate of the fluid in at least one first thermal cycle component connected to the flow control valve according to the actual usage of the whole vehicle, so as to simulate the thermal impact of temperature changes in different areas of the passenger compartment on the battery, so as to match the temperature in the thermal cycle component with the air-conditioning temperature of the whole vehicle, so as to further improve the degree of equivalence between the battery testing device and the actual usage scenario, so as to simulate the performance changes of the battery in the whole vehicle under actual conditions, and at the same time improve the efficiency and qualification rate of product development and shorten the product development cycle.

[0024] In some implementations, the second heat source assembly further includes: a heat preservation layer, which is disposed on a surface of the first box body close to the interior of the first box body. Thus, in the embodiment of the present application, by disposing a heat preservation layer on a surface of the first box body close to the interior of the first box body, the heat preservation effect of the first box body can be maintained during the simulation process, thereby improving the utilization rate of the heat source, reducing energy consumption, and reducing the experimental cost during the simulation process.

[0025] In some embodiments, the battery testing device also includes a windshield assembly, which includes two first side panels arranged opposite to each other along a first direction, and two second side panels arranged opposite to each other along a second direction, the first direction is perpendicular to the thickness direction of the battery testing device, and the second direction is perpendicular to the first direction, the two first side panels and the two second side panels enclose a second accommodating space, and the battery is arranged in the second accommodating space.

[0026] In an embodiment of the present application, a windshield assembly is provided in the battery testing device, and the windshield assembly includes two first side panels arranged opposite to each other along a first direction, and two second side panels arranged opposite to each other along a second direction, and the two first side panels and the two second side panels enclose a second accommodating space. The battery is arranged in the second accommodating space, which can simulate the thermal impact of the windshield around the vehicle battery on the battery under different working conditions, so as to further improve the degree of equivalence between the battery testing device and the actual usage scenario, so as to simulate the performance changes of the battery in the whole vehicle under actual conditions, and at the same time improve the efficiency and qualification rate of product development and shorten the product development cycle.

[0027] In some implementations, the windshield assembly further includes two second movable parts, which are connected to the surface of the first side plate close to the battery, so that the first side plate can move along the first direction through the second movable parts. In this way, in the embodiment of the present application, the first side plate can move in the first direction through the second movable parts, and the thermal impact of the windshield assembly on the battery under different working conditions can be simulated by adjusting the distance between the first side plate and the battery, so as to further improve the degree of equivalence between the battery testing device and the actual use scenario, so as to simulate the performance changes of the battery in the whole vehicle under actual conditions, and at the same time improve the efficiency and qualification rate of product development, and shorten the product development cycle.

[0028] In some implementations, the windshield assembly further includes a third movable component, and the third movable component is connected to the surface of the second side plate close to the battery, so that the second side plate can move along the second direction through the third movable component. In this way, in the embodiment of the present application, the second side plate can be moved in the second direction through the third movable component, and the thermal impact of the windshield assembly on the battery under different working conditions can be simulated by adjusting the distance between the second side plate and the battery, so as to further improve the degree of equivalence between the battery testing device and the actual use scenario, so as to simulate the performance changes of the battery in the whole vehicle under actual conditions, and at the same time improve the efficiency and qualification rate of product development, and shorten the product development cycle.

[0029] In some embodiments, the second side panel includes a first sub-side panel and a second sub-side panel, the surface of the first sub-side panel is provided with at least one first groove extending along a first direction, the surface of the second sub-side panel is provided with at least one first protrusion extending along the first direction, and at least a portion of the first protrusion is accommodated in the first groove so that the first sub-side panel and the second sub-side panel can move along the first direction.

[0030] In an embodiment of the present application, the second side panel includes a first sub-side panel and a second sub-side panel, the surface of the first sub-side panel is provided with at least one first groove extending along the first direction, the surface of the second sub-side panel is provided with at least one first protrusion extending along the first direction, and at least a portion of the first protrusion is accommodated in the first groove, so that the distance between the first side panel and the battery can be adjusted by adjusting the relative movement between the first sub-side panel and the second sub-side panel through the structure, thereby simulating the thermal impact of the windshield assembly on the battery under different working conditions, so as to further improve the degree of equivalence between the battery testing device and the actual usage scenario, so as to simulate the performance changes of the battery in the whole vehicle under actual conditions, and at the same time improve the efficiency and qualification rate of product development and shorten the product development cycle.

[0031] In a second aspect, a battery testing system is provided, comprising: a host computer, a heat source output device, a temperature sensor, and a battery testing device as described in any implementation of the first aspect above, wherein the host computer is wirelessly connected to the heat source output device, the heat source output device is connected to the battery testing device, the battery testing device is connected to the temperature sensor, and the temperature sensor is wirelessly connected to the host computer.

[0032] In some implementations, when the battery testing device includes a second heat source component, and the second heat source component includes at least one first thermal cycle component, the battery testing system also includes: a flow control valve, the flow control valve includes a plurality of ports, the first port of the flow control valve is connected to the heat source output device, the remaining ports of the flow control valve are respectively connected to the at least one first thermal cycle component, and the flow control valve is wirelessly connected to the host computer. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. 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 the drawings without paying creative work.

[0034] Figure 1 It is a structural schematic diagram of a vehicle provided in one embodiment of the present application.

[0035] Figure 2It is a schematic diagram of the structure of a battery provided in one embodiment of the present application.

[0036] Figure 3 It is a structural schematic diagram of a battery cell provided in one embodiment of the present application.

[0037] Figure 4 It is a structural schematic diagram of a battery testing device provided in one embodiment of the present application.

[0038] Figure 5 It is a partial structural diagram of a battery testing device provided in another embodiment of the present application.

[0039] Figure 6 It is a structural schematic diagram of a first height adjustment component provided in one embodiment of the present application.

[0040] Figure 7 It is a structural schematic diagram of a first heat source component provided in one embodiment of the present application.

[0041] Figure 8 It is a structural schematic diagram of a second heat source component provided in one embodiment of the present application.

[0042] Fig. 9 It is a structural schematic diagram of a second height adjustment device provided in one embodiment of the present application.

[0043] Fig.10 It is a structural schematic diagram of a second heat source component provided in another embodiment of the present application.

[0044] Fig.11 It is a partial structural schematic diagram of a second heat source component provided in another embodiment of the present application.

[0045] Fig.12 It is a cross-sectional schematic diagram of a windshield assembly provided in one embodiment of the present application.

[0046] Fig.13 It is a structural schematic diagram of a windshield assembly provided in one embodiment of the present application.

[0047] Fig.14 It is a schematic block diagram of a battery testing system provided in one embodiment of the present application.

[0048] Fig.15 It is a schematic block diagram of a battery testing system provided in another embodiment of the present application.

[0049] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0050] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the embodiments of the present application, but cannot be used to limit the scope of the embodiments of the present application, that is, the embodiments of the present application are not limited to the described embodiments.

[0051] Unless otherwise defined, all technical and scientific terms used in the embodiments of the present application have the same meanings as those commonly understood by technicians in the technical fields belonging to the embodiments of the present application; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0052] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0053] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0054] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0055] It should be understood that in the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0056] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0057] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0058] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0059] The battery in the embodiments of the present application refers to a physical module including one or more battery cells to provide electrical energy. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can reduce the impact of liquid or other foreign matter on the charging or discharging of the battery cells.

[0060] It should be understood that the battery cells in the embodiments of the present application include but are 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-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0061] In some implementations, the battery cell in the embodiments of the present application may be a metal battery. Specifically, the metal battery may include a lithium metal secondary battery, a sodium metal battery, a magnesium metal battery, or the like.

[0062] In some implementations, a battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0063] In some implementations, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0064] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0065] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc., treated with silver surface, may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0066] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. In some implementations, other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, lithium iron phosphate (such as LiFePO4, which may also be referred to as LFP), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and at least one of a composite material of lithium iron manganese phosphate and carbon.

[0067] As an example, the positive electrode active material may include at least one of a sodium transition metal oxide, a polyanionic compound, and a Prussian blue compound:

[0068] In some implementations, the chemical formula of the sodium transition metal oxide may satisfy Na x MO2, wherein M is one or more of Ti, V, Mn, Co, Ni, Fe, Zn, V, Zr, Ce, Cr and Cu, and 0<x≤1. As an example, Na xIn MO2, x can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or 1.

[0069] In some implementations, the sodium transition metal oxide may be a doped sodium transition metal oxide, and the doping modification of the sodium transition metal oxide may include at least one of sodium site doping modification, oxygen site doping modification, transition metal site doping modification, and surface coating modification.

[0070] In some implementations, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, or a carbon foam. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal, or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0071] In some implementations, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0072] As an example, the negative electrode current collector can be a metal foil, a foamed metal or a composite current collector. For example, as a metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. can be used. The composite current collector may include a polymer material base and a metal layer. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, or carbon foam, etc. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0073] In some implementations, the battery cell in the embodiments of the present application may be a negative electrode-free sodium secondary battery.

[0074] A negative electrode-free sodium secondary battery refers to a battery cell that does not actively set a negative electrode active material layer on the negative electrode side during the manufacturing process of the battery cell. For example, a sodium metal or carbonaceous active material layer is not set at the negative electrode through coating or deposition to form a negative electrode active material layer during the manufacturing process of the battery cell. During the first charge, the sodium ions obtain electrons on the anode side to deposit on the surface of the current collector to form a sodium metal phase. During discharge, the metallic sodium can be converted into sodium ions and return to the positive electrode to achieve cyclic charge and discharge. Compared with other sodium secondary batteries, negative electrode-free sodium secondary battery cells can achieve higher energy density because they do not have a negative electrode active material layer.

[0075] In some implementations, in order to improve the performance of battery cells, some functional coatings, such as carbonaceous materials, metal oxides, alloys, etc., can be provided on the negative electrode side of the negative electrode-free sodium secondary battery to improve the conductivity of the negative electrode current collector and improve the uniformity of the deposited sodium metal.

[0076] In some implementations, the CB value of the negative electrode-free sodium secondary battery is less than or equal to 0.1.

[0077] Specifically, the CB value is the unit area capacity of the negative electrode plate in the secondary battery divided by the unit area capacity of the positive electrode plate. Since the negative electrode-free battery does not contain or only contains a small amount of functional coating, the unit area capacity of the negative electrode plate is small, and the CB value of the secondary battery is less than or equal to 0.1.

[0078] In some implementations, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0079] In some implementations, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0080] In some implementations, the isolation member is an isolation membrane. The embodiment of the present application has no particular limitation on the type of isolation membrane, and any known porous structure isolation membrane with good chemical stability and mechanical stability can be selected.

[0081] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0082] In some implementations, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0083] In some implementations, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The present application embodiment has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0084] In some implementations, the electrode assembly may be a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0085] In some implementations, the electrode assembly is a laminate structure. As an example, a plurality of positive plates and a plurality of negative plates may be provided, respectively, and the plurality of positive plates and the plurality of negative plates may be alternately stacked.

[0086] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0087] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0088] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0089] As an example, the separator may be disposed continuously, and disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0090] In some implementations, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0091] In some implementations, the electrode assembly is provided with tabs, which can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0092] In some implementations, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0093] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery.

[0094] In order to meet different power requirements, the battery in the embodiment of the present application may include multiple battery cells, wherein the multiple battery cells can be connected in series, in parallel, or in a hybrid connection, where the hybrid connection refers to a mixture of series and parallel connections. Optionally, multiple battery cells can first be connected in series, in parallel, or in a hybrid connection to form a battery module, and multiple battery modules can then be connected in series, in parallel, or in a hybrid connection to form a battery. In other words, multiple battery cells can directly form a battery, or they can first form a battery module, and the battery module can then form a battery. The battery is further arranged in an electrical device to provide electrical energy to the electrical device.

[0095] At present, with the increasing environmental pollution, the new energy industry has attracted more and more attention. In the new energy industry, battery technology is an important factor related to its development. Temperature has a significant impact on the performance of new energy vehicle power batteries. During vehicle charging and driving, the battery will generate a lot of heat. The continuous accumulation of heat will cause the battery capacity and life to decrease to varying degrees. If the heat accumulated in the battery cannot be dissipated in time, it will cause thermal runaway of the battery. In severe cases, it will cause violent combustion and explosion, seriously threatening the lives and property safety of consumers. To this end, the battery test system can be used to simulate the temperature changes of the battery in the whole vehicle to reduce the risk of thermal runaway of the battery.

[0096] Current battery testing devices usually simulate the impact of changes in atmospheric temperature on battery performance. The degree of equivalence between the battery testing device and the battery in actual scenarios is poor, resulting in large deviations in the test results. Specifically, current battery testing devices usually only involve the thermal impact of atmospheric temperature on the battery, and do not consider the equivalence with the actual vehicle environment. The batteries in actual vehicles are affected by multiple heat sources, such as the passenger compartment or surface temperature, which causes the test results of the battery testing device to deviate from the actual results. Therefore, how to improve the degree of equivalence between battery testing devices and actual usage scenarios has become a technical problem that needs to be urgently solved in this field.

[0097] In view of this, an embodiment of the present application provides a battery testing device, which is applied to a battery testing system, and the battery testing device includes: a battery; a first heat source component, which is arranged on a side of the battery close to the ground surface, and the first heat source component is used to simulate the temperature change of the ground surface, and / or, a second heat source component, which is arranged on a side of the battery away from the ground surface, and the second heat source component is used to simulate the temperature change inside the passenger compartment of the vehicle. In this way, in the embodiment of the present application, the degree of equivalence between the battery testing device and the actual use scenario can be effectively improved to simulate the performance change of the battery in the whole vehicle under actual conditions, while improving the efficiency and qualification rate of product development and shortening the product development cycle.

[0098] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting tools, grinding tools, assembly tools and railway tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0099] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the electrical equipment described above, but can also be applied to all equipment using batteries. For the sake of simplicity, the following embodiments are described in detail using the electrical equipment as a vehicle as an example.

[0100] For example, Figure 1As shown, it is a structural schematic diagram of a vehicle 1 provided in an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 40, a controller 30 and a battery 10 may be arranged inside the vehicle 1. The controller 30 is used to control the battery 10 to supply power to the motor 40. For example, a battery 10 may be arranged at the bottom, front or rear of the vehicle 1. The battery 10 may be used to power the vehicle 1. For example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another implementation of the present application, the battery 10 may not only be used as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0101] In order to meet different power usage requirements, the battery 10 in the embodiment of the present application can be a battery cell group or a battery pack. The battery 10 may include at least one battery cell group, and the battery cell group includes multiple battery cells, wherein the multiple battery cells can be electrically connected in series, parallel or mixed to form the battery 10, wherein mixed refers to a mixture of series and parallel. The battery 10 may also be referred to as a battery pack. For example, multiple battery cells can first be connected in series, parallel or mixed to form a battery module, and multiple battery modules can then be connected in series, parallel or mixed to form a battery 10. In other words, multiple battery cells can directly form a battery 10, or they can be first formed into a battery module, and then the battery modules can be formed into a battery 10.

[0102] In some implementations, the battery 10 may include a plurality of battery cells. Figure 2 , which is a schematic diagram of the structure of a battery 10 according to an embodiment of the present application, wherein the battery 10 may include a plurality of battery cells 20. The battery 10 may also include a housing 11, wherein the interior of the housing 11 is a hollow structure, and the plurality of battery cells 20 are accommodated in the housing 11. For example, the plurality of battery cells 20 are connected in parallel, in series, or in a mixed combination and then placed in the housing 11.

[0103] In some implementations, the battery 10 may also include other structures, which are not described one by one here. For example, the battery 10 may also include a busbar component, which is used to realize electrical connection between multiple battery cells 20, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can realize electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Furthermore, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of multiple battery cells 20 can be further led out through the box through a conductive mechanism. Optionally, the conductive mechanism may also belong to the busbar component.

[0104] In an embodiment of the present application, the number of battery cells 20 can be set to any value according to different power requirements. Multiple battery cells 20 can be connected in series, in parallel or in a mixed manner to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery 10 may be large, in order to facilitate installation, the battery cells 20 can be grouped, and each group of battery cells 20 constitutes a battery module. The number of battery cells 20 included in the battery module is not limited and can be set according to demand. The battery 10 may include multiple battery modules, which can be connected in series, in parallel or in a mixed manner.

[0105] like Figure 3 As shown, it is a schematic diagram of the structure of a battery cell 20 according to an embodiment of the present application, and the battery cell 20 includes one or more electrode assemblies 22, a shell 211 and a cover plate 212. The shell 211 and the cover plate 212 form a shell or battery box 21. The walls of the shell 211 and the cover plate 212 are both called the walls of the battery cell 20, wherein for a rectangular battery cell 20, the wall of the shell 211 includes a bottom wall and four side walls. The shell 211 is determined according to the shape of one or more electrode assemblies 22 after combination. For example, the shell 211 can be a hollow cuboid or cube or cylinder, and one of the faces of the shell 211 has an opening so that one or more electrode assemblies 22 can be placed in the shell 211. For example, when the shell 211 is a hollow cuboid or cube, one of the planes of the shell 211 is an open surface, that is, the plane does not have a wall body so that the inside and outside of the shell 211 are connected. When the shell 211 can be a hollow cylinder, the end surface of the shell 211 is an open surface, that is, the end surface has no wall so that the inside and outside of the shell 211 are connected. The cover plate 212 covers the opening and is connected to the shell 211 to form a closed cavity for placing the electrode assembly 22. The shell 211 is filled with an electrolyte, such as an electrolyte.

[0106] The battery cell 20 may also include two electrode terminals 214, which may be disposed on the cover plate 212. The cover plate 212 is generally in the shape of a flat plate, and the two electrode terminals 214 are fixed on the flat surface of the cover plate 212, and the two electrode terminals 214 are respectively a positive electrode terminal 214a and a negative electrode terminal 214b. Each electrode terminal 214 is provided with a corresponding connection member, or may also be referred to as a current collecting member, which is located between the cover plate 212 and the electrode assembly 22, and is used to electrically connect the electrode assembly 22 and the electrode terminal 214.

[0107] like Figure 3 As shown, each electrode assembly 22 has a first electrode tab 221a and a second electrode tab 222a. The polarities of the first electrode tab 221a and the second electrode tab 222a are opposite. For example, when the first electrode tab 221a is a positive electrode tab, the second electrode tab 222a is a negative electrode tab.

[0108] In the battery cell 20, according to actual use requirements, the electrode assembly 22 can be provided as a single electrode assembly or a plurality of electrodes. Figure 3 As shown, two independent electrode assemblies 22 are disposed in the battery cell 20 .

[0109] A pressure relief mechanism 213 may also be provided on the battery cell 20. The pressure relief mechanism 213 is used to be activated to release the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold value.

[0110] The pressure relief mechanism 213 may be a variety of possible pressure relief structures. For example, the pressure relief mechanism 213 may be a temperature-sensitive pressure relief mechanism, which is configured to melt when the internal temperature of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value; and / or, the pressure relief mechanism 213 may be a pressure-sensitive pressure relief mechanism, which is configured to rupture when the internal gas pressure of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value.

[0111] Figure 4 A schematic structural diagram of a battery testing device 50 provided in an embodiment of the present application is shown.

[0112] It should be understood that in the embodiments of the present application, Figure 4 As shown, the first direction X may be the length direction of the battery testing device 50, and the first direction X is perpendicular to the second direction Y and the third direction Z; the second direction Y may be the width direction of the battery testing device 50, and the second direction Y is perpendicular to the first direction X and the third direction Z; the third direction Z may be the height direction of the battery testing device 50, and the third direction Z is perpendicular to the first direction X and the second direction Y.

[0113] In some embodiments, the battery testing device 50 includes a battery 10 and a first heat source component 60 and / or a second heat source component 70, wherein the first heat source component 60 is disposed on a side of the battery 10 close to the ground surface, and the first heat source component 60 is used to simulate the temperature change of the ground surface, and the second heat source component 70 is disposed on a side of the battery 10 away from the ground surface, and the second heat source component 70 is used to simulate the temperature change inside the passenger compartment of the vehicle.

[0114] It should be understood that in the embodiment of the present application, the first heat source component 60 and / or the second heat source component 70 can be a component that can regulate its own temperature, or can be a component that regulates the temperature through the fluid output by the heat source output device in the battery testing system. For example, the first heat source component 60 and / or the second heat source component 70 can be a cavity connected to the heat source output device, and the temperature of the first heat source component 60 and / or the second heat source component 70 can be regulated by the fluid flowing out of the heat source output device.

[0115] In an embodiment of the present application, a first heat source component 60 and / or a second heat source component 70 are arranged in a battery testing device 50, wherein the first heat source component 60 is arranged on a side of the battery 10 close to the ground surface, and the first heat source component 60 is used to simulate the temperature change of the ground surface; the second heat source component 70 is arranged on a side of the battery 10 away from the ground surface, and the second heat source component 70 is used to simulate the temperature change inside the passenger compartment of the vehicle. This can effectively improve the degree of equivalence between the battery testing device 50 and the actual usage scenario, so as to simulate the performance change of the battery 10 in the whole vehicle under actual conditions, while improving the efficiency and qualification rate of product development and shortening the product development cycle.

[0116] Figure 5 It is a partial structural diagram of a battery testing device 50 provided in another embodiment of the present application. Figure 6 It is a structural schematic diagram of a first height adjustment component 80 provided in one embodiment of the present application.

[0117] In some implementations, such as Figure 5 and Figure 6 As shown, the battery testing device 50 also includes a first height adjustment component 80 , which is disposed between the battery 10 and the first heat source component 60 , and is used to adjust the distance between the battery 10 and the first heat source component 60 .

[0118] It should be understood that in the embodiment of the present application, the end of the first height adjustment device 80 close to the battery 10 can be fixedly connected to the battery, such as by bolting, welding or bonding; the end of the first height adjustment device 80 away from the battery 10 can be connected to the ground surface or the surface of the first heat source component 60 close to the battery 10, wherein the end of the first height adjustment device 80 away from the battery 10 can be fixedly connected or movably connected to the surface of the first heat source component 60 close to the battery 10.

[0119] It should also be understood that in some implementations, such as Figure 6As shown, the first height adjustment device 80 may be a jack bolt, and the first height adjustment device 80 may include a base 810, a screw rod 820, and a locking nut 830. Among them, the surface of the screw rod 820 on the side close to the battery 10 is provided with a threaded hole 840, and the bolt connection with the battery 10 can be achieved through the threaded hole 840; the surface of the base 810 on the side close to the battery 10 is provided with a through hole, and the through hole penetrates the base 810 along the height direction of the first height adjustment device 80; the outer periphery of the screw rod 820 is provided with an external thread matching the internal thread inside the through hole of the base 810, so that the screw rod 820 can be screwed into the through hole of the base 810; the locking nut 830 is sleeved on the outer periphery of the screw rod 820 to limit the screw rod 820.

[0120] In an embodiment of the present application, by setting a first height adjustment component 80 in the battery testing device 50, the first height adjustment component 80 is used to adjust the distance between the battery 10 and the first heat source component 60, and the first height adjustment component 80 is set between the battery 10 and the first heat source component 60, it can effectively simulate the thermal impact of the surface temperature on batteries in different vehicles, so as to further improve the degree of equivalence between the battery testing device 50 and the actual usage scenarios, so as to simulate the performance changes of the battery in the whole vehicle under actual conditions, while improving the efficiency and qualification rate of product development and shortening the product development cycle.

[0121] Figure 7 A schematic structural diagram of a first heat source assembly 60 provided in one embodiment of the present application is shown.

[0122] In some implementations, such as Figure 7 As shown, the first heat source assembly 60 includes a first main body component 610 and a first mounting component 620. The first mounting component 620 is arranged on a surface of the first main body component 610 away from the center position of the first main body component 610. The first main body component 610 is connected to the heat source output device in the battery testing system.

[0123] It should be understood that in the embodiment of the present application, a first loading hole 621 is provided on the surface of the first mounting component 620 in the thickness direction perpendicular to the first heat source component 60. By way of example, two first mounting components 620 may be provided on each of the outer surfaces of the two side walls of the first main body component 610 that are perpendicular to the length direction of the first heat source component 60, and a first loading hole 621 is provided on the surface of the first mounting component 620 that is perpendicular to the thickness direction of the first heat source component 60. In actual use, the first heat source component 60 can be moved through the first loading hole 621.

[0124] In the embodiment of the present application, the first heat source component 60 includes a first main body component 610 and a first mounting component 620. The first mounting component 620 is arranged on a surface of the first main body component 610 away from the center position of the first main body component 610, and the first main body component 610 is connected to the heat source output device in the battery testing system. The first heat source component 60 can be lifted and transported by the first mounting component 620 to facilitate the installation and disassembly of the first heat source component 60 in the battery testing device 50. The structure is simple and easy to process and manufacture.

[0125] In some implementations, the first main body component 610 includes at least two sub-components, the at least two sub-components are spaced apart along a first direction, any two adjacent sub-components of the at least two sub-components are connected through a connecting pipe, and the first direction is perpendicular to the thickness direction of the battery testing device 50. Thus, in the embodiment of the present application, the first main body component 610 may include at least two sub-components, the at least two sub-components are spaced apart along a first direction, any two adjacent sub-components of the at least two sub-components may be connected through a connecting pipe, so as to facilitate the installation and removal of the first heat source assembly 60, and at the same time, compared with the first main body component 610 of an integral structure, it can significantly save material expenses and reduce experimental testing costs.

[0126] Figure 8 A schematic structural diagram of a second heat source assembly 70 provided in one embodiment of the present application is shown.

[0127] In some implementations, such as Figure 8 As shown, the second heat source assembly 70 includes: a first box body 710, and at least one first through hole 720 is provided on the surface of the first box body 710 perpendicular to the first direction, and the first through hole 720 is used to connect with the heat source output device in the battery testing system, and the first direction is perpendicular to the thickness direction of the battery testing device 50.

[0128] It should be understood that in the embodiment of the present application, the shape of the first through hole 720 can be set according to actual needs. For example, the shape of the first through hole 720 includes but is not limited to a circle, an ellipse, a rectangle, and a regular polygon.

[0129] It should also be understood that in the embodiment of the present application, a box cover may be provided on the upper surface of the first box body 710 away from the battery 10, and the box cover may be movably connected to the first box body 710 to simulate the thermal impact of the passenger compartment of different vehicle models on the battery 10.

[0130] In an embodiment of the present application, a first box body 710 is provided in the second heat source assembly 70, and at least one first through hole 720 is provided on the surface of the first box body perpendicular to the first direction. The first through hole 720 is used to connect with the heat source output device in the battery testing system, so that the temperature changes inside the passenger compartment of the vehicle can be simulated through the first box body 710, so as to improve the equivalence between the battery testing device 50 and the actual usage scenario, so as to simulate the performance changes of the battery in the whole vehicle under actual conditions. At the same time, the structural design is simple, which is conducive to reducing processing and manufacturing costs.

[0131] Fig. 9 A schematic structural diagram of a second height adjustment device provided in one embodiment of the present application is shown.

[0132] In some implementations, such as Fig. 9 As shown, the battery testing device 50 also includes a second height adjustment device 90, which is arranged on the surface of the second heat source component 70 on the side close to the ground surface, and the second height adjustment device 90 is used to adjust the distance between the second heat source component 70 and the ground surface.

[0133] like Fig. 9 As shown, in some implementations, the second height adjustment device 90 includes two first connecting rods 910 relatively arranged along the length direction of the battery testing device 50, and a second connecting rod 920 connected between the two ends of the two first connecting rods 910 along the width direction of the battery testing device 50, a constant speed commutator 930 is provided at the connection between the first connecting rod 910 and the second connecting rod 920, and a power wheel 940 is installed on the second connecting rod 920, and a height adjustment turbine 950 is provided on the first connecting rod 910, and a height adjustment worm 960 is connected to the side of the height adjustment turbine 950 close to the ground, and one end of the height adjustment worm 960 close to the ground is attached to the ground, and a mounting hole 951 is also provided on the surface of the side of the height adjustment turbine 950 away from the ground, through which connection with the second heat source assembly 70 can be achieved. Specifically, during use, the telescopic movement of the height adjustment worm 960 can be controlled by manipulating the power wheel 940, thereby adjusting the distance between the second heat source assembly 70 and the ground surface. It should also be understood that in the embodiment of the present application, the power wheel 940 can be operated by manpower or by a motor.

[0134] In an embodiment of the present application, a second height adjustment device 90 is provided in the battery testing device 50, and the second height adjustment device 90 is used to adjust the distance between the second heat source component 70 and the ground surface. The second height adjustment device 90 is provided on the surface of the second heat source component 70 on the side close to the ground surface. This can effectively simulate the thermal impact of the crew compartment in different vehicles on the battery 10, improve the degree of equivalence between the battery testing device 50 and the actual usage scenario, so as to simulate the performance changes of the battery 10 in the whole vehicle under actual conditions, and at the same time improve the efficiency and qualification rate of product development and shorten the product development cycle.

[0135] In some implementations, as above Figure 8 As shown, at least one second mounting component 730 is further provided on the surface of the first box body 710 perpendicular to the first direction.

[0136] It should be understood that in the embodiment of the present application, the surface of the second mounting component 730 perpendicular to the first direction may be provided with a second mounting hole. For example, three second mounting components 730 may be provided on the outer surfaces of the two side walls of the first box body 710 perpendicular to the first direction, and the surface of the second mounting component 730 perpendicular to the first direction is provided with a second loading hole. In actual use, the second heat source component 70 can be moved through the second mounting hole.

[0137] Thus, in the embodiment of the present application, by providing at least one second mounting component 730 on the surface of the first box body 710 perpendicular to the first direction, the second heat source component 70 can be lifted and transported by the second mounting component 730 to facilitate the installation and disassembly of the second heat source component 70 in the battery testing device 50.

[0138] Fig.10 A schematic structural diagram of a second heat source assembly 70 provided in another embodiment of the present application is shown. Fig.11 A partial structural schematic diagram of a second heat source assembly 70 provided in another embodiment of the present application is shown.

[0139] In some implementations, such as Fig.10 and Fig.11 As shown, the first box body 710 includes a first accommodating space 711 , and the second heat source assembly 70 also includes at least one first heat circulation component 740 , and the at least one first heat circulation component 740 is disposed in the first accommodating space 711 .

[0140] It should be understood that in the embodiment of the present application, along the height direction of the second heat source assembly 70, the distance between the first heat circulation component 740 and the bottom wall of the first box body 710 can be set according to actual conditions to simulate the thermal impact of temperature changes in different areas of the vehicle passenger compartment on the battery.

[0141] For example, Fig.10 As shown, four first thermal cycle components 740 are arranged in the first accommodation space 711 of the first box body 710 in the second heat source assembly 70. The four first thermal cycle components 740 can be used to simulate the thermal impact of temperature changes in four areas of the vehicle passenger compartment on the battery.

[0142] It should also be understood that Fig.11 As shown, the first heat circulation component 740 includes a water cooling pipeline 743, and a water inlet 741 located at the end of the water cooling pipeline 743, and the water inlet 741 can be a water inlet or a water outlet. Secondly, the first heat circulation component 740 also includes a U-shaped side plate 742 attached to the water cooling pipeline 743, and the U-shaped side plate 742 can increase the heat dissipation area of ​​the first heat circulation component 740.

[0143] In the embodiment of the present application, the first box body 710 includes a first accommodating space 711. By arranging at least one first thermal cycle component 740 in the first accommodating space 711, the at least one first thermal cycle component 740 can simulate the thermal impact of temperature changes in different areas of the passenger compartment on the battery 10, and realize the function of equivalent vehicle air conditioning zoning temperature control, so as to further improve the degree of equivalence between the battery testing device 50 and the actual usage scenario, so as to simulate the performance changes of the battery 10 in the whole vehicle under actual conditions, and at the same time improve the efficiency and qualification rate of product development and shorten the product development cycle.

[0144] In some implementations, such as Fig.10 and Fig.11 As shown, the second heat source component 70 also includes at least one first sliding component 750, which is connected to the at least one first heat circulation component 740, and the first sliding component 750 corresponds one-to-one with the first heat circulation component 740 so that the first heat circulation component 740 moves on a plane perpendicular to the height direction of the second heat source component 70.

[0145] In some implementations, such as Fig.10 and Fig.11As shown, the first sliding component 750 includes a first guide rail 751 and a first pulley 752 movably connected to the first guide rail 751, and the first pulley 752 is provided with a through hole structure on the surface along the length direction of the second heat source component 70. The side wall of the first box body 710 in the second heat source component 70 perpendicular to the length direction of the second heat source component 70 is provided with a second through hole 760, and the surface of the other side wall of the first box body 710 corresponding to the second through hole 760 facing the inside of the first box body 710 is provided with a fixed bearing 770 corresponding to the second through hole 760. The second heat source component 70 also includes a third connecting rod 780, one end of the third connecting rod 780 along the length direction of the second heat source component 70 is connected to the fixed bearing 770, and the other end of the third connecting rod 780 along the length direction of the second heat source component 70 passes through the through hole on the first pulley 752 and the second through hole 760 in sequence, and the third connecting rod 780 passes through the second through hole 760 and protrudes from the outside of the first box body 710.

[0146] Specifically, when adjusting the position of the first thermal cycle component 740 in the first box 710, the first pulley 752 can be controlled on the third connecting rod 780 to drive the first thermal cycle component 740 to move along the length direction of the second heat source assembly 70, and the movement between the first guide rail 751 and the first pulley 752 can be controlled to drive the first thermal cycle component 740 to move along the width direction of the second heat source assembly 70. In some implementations, the movement of the first pulley 752 on the third connecting rod 780 and the movement between the first guide rail 751 and the first pulley 752 can be controlled simultaneously to achieve the movement of the first thermal cycle component 740 along the width and length directions of the second heat source assembly 70.

[0147] In the embodiment of the present application, by setting at least one first sliding component 750 in the second heat source component 70, the first sliding component 750 is connected to the at least one first heat cycle component 740, and the first sliding component 750 corresponds to the first heat cycle component 740 one by one. By adjusting the position of the first heat cycle component 740 in the first box 710 of the second heat source component 70, the thermal impact of temperature changes in different areas of the passenger compartment on the battery 10 can be simulated, and the function of equivalent vehicle air conditioning zoning temperature control can be achieved, so as to further improve the degree of equivalence between the battery testing device 50 and the actual use scenario, so as to simulate the performance changes of the battery 10 in the whole vehicle under actual conditions, and at the same time improve the efficiency and qualification rate of product development and shorten the product development cycle.

[0148] In some embodiments, the second heat source component 70 also includes a flow control valve, which includes multiple ports. The first port of the flow control valve is connected to the first through hole 720, and the remaining ports of the flow control valve are respectively connected to the at least one first heat cycle component 740. The flow control valve is used to adjust the flow of the fluid flowing to the at least first heat cycle component 740.

[0149] It should be understood that the flow control valve in the embodiment of the present application has multiple ports, and the flow control valve can be used to control the flow direction and flow rate of the fluid flowing through the multiple ports. Exemplarily, the flow control valve can be a five-way flow control valve, one port of which is connected to the heat source output device in the battery testing system, and the remaining four ports of the five-way flow control valve are respectively connected to the four first thermal cycle components 740 to control the flow rate of the fluid flowing through the four first thermal cycle components 740.

[0150] In the embodiment of the present application, a flow control valve is provided in the second heat source assembly 70, and the flow control valve is used to adjust the flow of the fluid flowing to the at least first thermal cycle component 740. The first end of the flow control valve is connected to the first through hole 720, and the other ends of the flow control valve are respectively connected to the at least one first thermal cycle component 740, that is, the flow control valve can adjust the flow of the fluid in the at least one first thermal cycle component 740 connected to the flow control valve according to the actual use situation in the whole vehicle, so as to simulate the thermal impact of the temperature changes in different areas of the passenger compartment on the battery 10, so as to match the temperature in the first thermal cycle component 740 with the air-conditioning temperature of the whole vehicle, so as to further improve the equivalence between the battery testing device 50 and the actual use scenario, so as to simulate the performance changes of the battery 10 in the whole vehicle under actual conditions, and at the same time improve the efficiency and qualification rate of product development, and shorten the product development cycle.

[0151] In some implementations, such as Figure 8 and Fig.10 As shown, the second heat source assembly 70 further includes a heat preservation layer, and the heat preservation layer 790 is disposed on the surface of the first box 710 close to the interior of the first box 710. Thus, in the embodiment of the present application, by disposing the heat preservation layer 790 on the surface of the first box 710 close to the interior of the first box 710, the heat preservation effect of the first box 710 can be maintained during the test simulation process, so as to improve the utilization rate of the heat source, reduce energy consumption, and reduce the experimental cost during the simulation process.

[0152] Fig.12 A cross-sectional schematic diagram of a windshield assembly 100 provided in one embodiment of the present application is shown. Fig.13 FIG. 1 is a schematic diagram showing the structure of a windshield assembly 100 provided in an embodiment of the present application. Fig.12The cross-sectional schematic diagram of the windshield assembly 100 shown in FIG. Fig.13 Schematic cross-sectional view of the windshield assembly 100 in a direction perpendicular to the height of the windshield assembly 100 is shown in FIG.

[0153] In some implementations, such as Fig.12 and Fig.13 As shown, the battery testing device 50 also includes a windshield assembly 100, which includes two first side panels arranged opposite to each other along a first direction, and two second side panels arranged opposite to each other along a second direction, the first direction is perpendicular to the thickness direction of the battery testing device 50, and the second direction is perpendicular to the first direction, the two first side panels and the two second side panels enclose a second accommodating space 111, and the battery 10 is arranged in the second accommodating space 111.

[0154] It should be understood that in the embodiments of the present application, Fig.12 and Fig.13 As shown, the first side plate includes a first baffle 101 and a second baffle 102 opposite to each other along a first direction, and the second side plate includes a third baffle 103 and a fourth baffle 104 opposite to each other along a second direction. The first direction may be the length direction of the wind shield assembly 100, and the second direction may be the width direction of the wind shield assembly 100.

[0155] In an embodiment of the present application, a windshield assembly 100 is set in the battery testing device 50, and the windshield assembly 100 includes two first side panels arranged opposite to each other along a first direction, and two second side panels arranged opposite to each other along a second direction, and the two first side panels and the two second side panels enclose a second accommodating space 111. The battery 10 is arranged in the second accommodating space 111, which can simulate the thermal impact of the windshield around the battery 10 in the vehicle under different working conditions on the battery 10, so as to further improve the degree of equivalence between the battery testing device 50 and the actual usage scenario, so as to simulate the performance changes of the battery 10 in the whole vehicle under actual conditions, and at the same time improve the efficiency and qualification rate of product development and shorten the product development cycle.

[0156] In some implementations, the windshield assembly 100 further includes two second movable components, which are connected to the surface of the first side plate close to the battery 10 so that the first side plate moves along the first direction through the second movable components.

[0157] It should be understood that Fig.13As shown, the second movable component includes a second guide rail 108 and a first slider 107. The first baffle 101 or the second baffle 102 in the first side panel can be driven to move along the first direction through the sliding connection between the second guide rail 108 and the first slider 107 connected thereto. The first direction can be the length direction of the wind shield assembly 100.

[0158] In an embodiment of the present application, the first side panel can be moved in the first direction by the second movable component, and the thermal impact of the windshield assembly 100 on the battery 10 under different working conditions can be simulated by adjusting the distance between the first side panel and the battery 10, so as to further improve the degree of equivalence between the battery testing device 50 and the actual usage scenario, so as to simulate the performance changes of the battery 10 in the whole vehicle under actual conditions, while improving the efficiency and qualification rate of product development and shortening the product development cycle.

[0159] In some implementations, the windshield assembly 100 further includes a third movable component, which is connected to a surface of the second side plate close to the battery 10 , so that the second side plate moves along the second direction through the third movable component.

[0160] It should be understood that Fig.13 As shown, the third movable component includes a third guide rail 110 and a second slider 109. The third baffle 103 or the fourth baffle 104 in the second side panel can drive the third baffle 103 or the fourth baffle 104 to move along the second direction through the sliding connection between the third guide rail 110 and the second slider 109 connected thereto. The second direction can be the width direction of the wind shield assembly 100.

[0161] In an embodiment of the present application, the second side panel can be moved in the second direction by the third movable component, and the thermal effect of the windshield assembly on the battery 10 under different working conditions can be simulated by adjusting the distance between the second side panel and the battery, so as to further improve the degree of equivalence between the battery testing device 50 and the actual usage scenario, so as to simulate the performance changes of the battery 10 in the whole vehicle under actual conditions, while improving the efficiency and qualification rate of product development and shortening the product development cycle.

[0162] In some implementations, such as Fig.13 As shown, the second side panel includes a first sub-side panel and a second sub-side panel, the surface of the first sub-side panel is provided with at least one first groove 105 extending along the first direction, the surface of the second sub-side panel is provided with at least one first protrusion 106 extending along the first direction, at least part of the first protrusion 106 is accommodated in the first groove 105, so that the first sub-side panel and the second sub-side panel can move along the first direction.

[0163] It should be understood that Fig.13As shown, when the second side plate is the fourth baffle plate 104, the fourth baffle plate may include a first sub-side plate and a second sub-side plate, the surface of the first sub-side plate is provided with at least one first groove 105 extending along the first direction, the surface of the second sub-side plate is provided with at least one first protrusion 106 extending along the first direction, at least a portion of the first protrusion 106 is accommodated in the first groove 105, so that the first sub-side plate and the second sub-side plate can move in the same direction or in the opposite direction along the first direction, and drive the first baffle plate 101 or the second baffle plate 102 to move along the first direction.

[0164] In an embodiment of the present application, the second side panel includes a first sub-side panel and a second sub-side panel, the surface of the first sub-side panel is provided with at least one first groove 105 extending along the first direction, the surface of the second sub-side panel is provided with at least one first protrusion 106 extending along the first direction, and at least a portion of the first protrusion 106 is accommodated in the first groove, so that the distance between the first side panel and the battery 10 can be adjusted by adjusting the relative movement between the first sub-side panel and the second sub-side panel through the structure, thereby simulating the thermal impact of the windshield assembly 100 on the battery 10 under different working conditions, so as to further improve the degree of equivalence between the battery testing device 50 and the actual usage scenario, so as to simulate the performance changes of the battery 10 in the whole vehicle under actual conditions, and at the same time improve the efficiency and qualification rate of product development and shorten the product development cycle.

[0165] In some implementations, the embodiment of the present application also provides an operation process for installing the battery testing device 50 in the battery testing system, which includes the following process, for example. First, according to the information of the actual project, the first height adjustment device 80 in the battery testing device 50 is adjusted. After the adjustment is completed, the first height adjustment device 80 is limited by the locking nut 830 in the first height adjustment device 80 to determine the distance between the ground surface and the battery 10. Secondly, the threaded hole 840 on the surface of the screw 820 in the first height adjustment device 80 close to the battery 10 is threadedly connected to the battery 10. Secondly, the first heat source component 60 is transported to the experimental environmental chamber through the first mounting component 620 in the first heat source component 60. Secondly, the first height adjustment device 80 and the battery 10 that have been connected to each other are transported to the environmental chamber, and the end of the first height adjustment device 80 away from the battery 10 is attached to the surface of the first heat source component 60 close to the battery 10. Secondly, adjust the height of the second height adjustment device 90 to the maximum upper limit, and adjust the baffles in the windshield assembly 100 around the battery 10 to the edge of the guide rail structure. Secondly, transfer the connected second heat source assembly 70, windshield assembly 100 and second height adjustment device 90 to the environmental chamber, and pay attention to reducing the collision between the battery and the windshield assembly 100 when placing them. Secondly, adjust the second height adjustment device 90 according to the information of the actual project to determine the distance between the passenger compartment and the battery 10, and adjust the distance between the baffle in the windshield assembly 100 and the battery 10 and the height of the baffle so that the baffle is close to the battery 10. Secondly, the position of the first thermal cycle component 740 in the second heat source assembly 70 can be further adjusted to simulate the temperature change of the air conditioner or seat in the whole vehicle. Subsequently, remove the second height adjustment device 90 to reduce the impact on the experimental test data and complete the installation of the battery test device 50. Finally, the battery testing device 50 is wirelessly connected to the host computer in the battery testing system, the battery testing device 50 is connected to the heat source output device in the battery testing system through a pipeline, the battery testing device 50 is connected to the temperature sensor in the battery testing system, the temperature sensor is connected to the host computer, and the test is started after the host computer sets the data required for the experiment.

[0166] Fig.14 A schematic block diagram of a battery testing system 200 provided in an embodiment of the present application is shown. Fig.15 A schematic block diagram of a battery testing system 300 provided in another embodiment of the present application is shown.

[0167] In some implementations, such as Fig.14As shown, the battery testing system 200 includes a host computer 210, a heat source output device 220, a temperature sensor 230 and a battery testing device 50 as in the above embodiment, wherein the host computer 210 is wirelessly connected to the heat source output device 220, the heat source output device 220 is connected to the battery testing device 50, the battery testing device 50 is connected to the temperature sensor 230, and the temperature sensor 230 is wirelessly connected to the host computer 210.

[0168] It should be understood that in the embodiment of the present application, the host computer 210 has the ability to output signals and set parameters, and can perform simple logic judgments. For example, the host computer 210 can realize the function of setting the target temperature and importing the temperature curve with one key, and can also perform result judgment on the temperature of the battery test device 50 fed back by the temperature sensor 230, and control the heat source output device 220 to adjust the temperature of the battery test device 50.

[0169] Exemplarily, when the test device 50 includes a first heat source component 60, the host computer 210 can set the target temperature according to actual needs, and send a control signal and heat source parameter information to the heat source output device 220. Then the heat source output device 220 outputs heat to the first heat source component 60. The first temperature sensor 231 on the surface of the first heat source component 60 close to the battery 10 feeds back the temperature information of the first heat source component 60 to the host computer 210 in real time. If the temperature of the first heat source component 60 does not meet the target temperature, the host computer 210 adjusts the parameters of the heat source output by the heat source output device 220 so that the temperature of the first heat source component 60 meets the target temperature; if the temperature of the first heat source component 60 meets the target temperature, the host computer 210 determines a temperature curve based on the current target temperature. The temperature curve can be a heating curve or a cooling curve to simulate the heating or cooling process of the surface. Similarly, the host computer 210 sends a control signal and heat source parameter information to the heat source output device 220 , and then the heat source output device 220 outputs the heat source to the first heat source component 60 to simulate the thermal impact of the ground surface temperature on the battery 10 .

[0170] The heat source output device 220 in the embodiment of the present application can receive the control instructions and parameter requirements given by the host computer 210 in real time, and run the control instructions after the heat source inside the heat source output device 220 meets the parameter requirements, so as to provide heat source output in real time to the battery testing device 50. The temperature sensor 230 in the embodiment of the present application has the function of real-time acquisition and feedback of temperature signals, that is, the temperature sensor 230 can real-time acquire the temperature of the battery testing device 50 and feedback it to the host computer 210 for determination and analysis.

[0171] In some implementations, such as Fig.15As shown, when the battery testing device 50 includes a second heat source component 70, and the second heat source component 70 includes at least one first heat cycle component 740, the battery testing system 300 also includes: a flow control valve 240, the flow control valve 240 includes a plurality of ports, the first port of the flow control valve 240 is connected to the heat source output device 220, and the remaining ports of the flow control valve 240 are respectively connected to the at least one first heat cycle component 740, and the flow control valve 240 is wirelessly connected to the host computer 210.

[0172] Specifically, Fig.15 As shown, the host computer 210 can set the target temperature according to actual needs, and send a control signal and heat source parameter information to the heat source output device 220. Secondly, the host computer 210 can send flow parameter information of each channel flowing through the flow control valve 240 to the flow control valve 240 in the battery testing system 300. Then, the flow control valve 240 receives the heat source sent by the heat source output device 220, and adaptively adjusts the flow of the heat source of each channel and inputs it into the second heat source component 70. The surface of the second heat source component 70 close to the battery 10 The second temperature sensor 232 on the upper device feeds back the temperature information of the second heat source component 70 to the upper computer 210 in real time. If the temperature of the second heat source component 70 does not meet the target temperature, the upper computer 210 adjusts the parameters of the heat source output by the heat source output device 220 so that the temperature of the second heat source component 70 meets the target temperature; if the temperature of the second heat source component 70 meets the target temperature, the upper computer 210 determines a temperature curve based on the current target temperature, and the temperature curve can be a heating curve or a cooling curve to simulate the heating or cooling process of the passenger compartment. Similarly, the host computer 210 sends a control signal and heat source parameter information to the heat source output device 220. The host computer 210 can send flow parameter information of each channel flowing through the flow control valve 240 to the flow control valve 240 in the battery testing system 300. Then, the flow control valve 240 receives the heat source sent by the heat source output device 220, and adaptively adjusts the flow of the heat source of each channel and inputs it into the second heat source component 70, so as to simulate the thermal impact of the temperature in the vehicle passenger compartment on the battery 10.

[0173] Although the present application has been described with reference to the above embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery testing device, characterized in that: Applied to battery testing systems, including: Battery; a first heat source component, the first heat source component is arranged on a side of the battery close to the ground surface, the first heat source component is used to simulate the temperature change of the ground surface, and / or, A second heat source assembly is disposed on a side of the battery away from the ground surface, and the second heat source assembly is used to simulate temperature changes inside a passenger compartment of a vehicle.

2. The battery testing device according to claim 1, characterized in that: The battery testing device further includes a first height adjustment component, which is disposed between the battery and the first heat source component, and is used to adjust the distance between the battery and the first heat source component.

3. The battery testing device according to claim 1 or 2, characterized in that: The first heat source assembly includes a first main body component and a first mounting component. The first mounting component is arranged on a surface of the first main body component away from the center of the first main body component. The first main body component is connected to a heat source output device in the battery testing system.

4. The battery testing device according to claim 3, characterized in that: The first main body component includes at least two sub-components, and the at least two sub-components are arranged at intervals along a first direction. Any two adjacent sub-components of the at least two sub-components are connected through a connecting pipe, and the first direction is perpendicular to the thickness direction of the battery testing device.

5. The battery testing device according to any one of claims 1 to 4, characterized in that: The second heat source assembly includes: a first box body, wherein a surface of the first box body perpendicular to a first direction is provided with at least one first through hole, wherein the first through hole is used to connect with a heat source output device in the battery testing system, and the first direction is perpendicular to a thickness direction of the battery testing device.

6. The battery testing device according to claim 5, characterized in that: The battery testing device also includes a second height adjustment device, which is arranged on the surface of the second heat source component on the side close to the ground surface, and the second height adjustment device is used to adjust the distance between the second heat source component and the ground surface.

7. The battery testing device according to claim 5 or 6, characterized in that: At least one second mounting component is also provided on a surface of the first box body that is perpendicular to the first direction.

8. The battery testing device according to any one of claims 5 to 7, characterized in that: The first box body includes a first accommodating space, and the second heat source assembly further includes at least one first thermal cycle component, and the at least one first thermal cycle component is disposed in the first accommodating space.

9. The battery testing device according to claim 8, characterized in that: The second heat source component also includes at least one first moving component, which is connected to the at least one first heat circulation component, and the first moving component corresponds one-to-one with the first heat circulation component so that the first heat circulation component moves in a plane perpendicular to the height direction of the second heat source component.

10. The battery testing device according to claim 8 or 9, characterized in that: The second heat source component also includes: a flow control valve, the flow control valve includes a plurality of ports, the first port of the flow control valve is connected to the first through hole, and the remaining ports of the flow control valve are respectively connected to the at least one first thermal cycle component, and the flow control valve is used to adjust the flow of the fluid flowing to the at least first thermal cycle component.

11. The battery testing device according to any one of claims 5 to 10, characterized in that: The second heat source assembly further includes: a heat-insulating layer, which is disposed on a surface of the first box body close to the interior of the first box body.

12. The battery testing device according to any one of claims 1 to 11, characterized in that: The battery testing device also includes a windshield assembly, which includes two first side panels arranged opposite to each other along a first direction, and two second side panels arranged opposite to each other along a second direction, the first direction is perpendicular to the thickness direction of the battery testing device, and the second direction is perpendicular to the first direction, the two first side panels and the two second side panels enclose a second accommodating space, and the battery is arranged in the second accommodating space.

13. The battery testing device according to claim 12, characterized in that: The windshield assembly further includes a second moving component connected to a surface of the first side plate close to the battery, so that the first side plate moves along the first direction through the second moving component.

14. The battery testing device according to claim 12 or 13, characterized in that: The windshield assembly further includes a third moving component, which is connected to a surface of the second side plate close to the battery, so that the second side plate moves along the second direction through the third moving component.

15. The battery testing device according to any one of claims 12 to 14, characterized in that: The second side panel includes a first sub-side panel and a second sub-side panel, the surface of the first sub-side panel is provided with at least one first groove extending along a first direction, the surface of the second sub-side panel is provided with at least one first protrusion extending along the first direction, at least part of the first protrusion is accommodated in the first groove, so that the first sub-side panel and the second sub-side panel can move along the first direction.

16. A battery testing system, characterized in that: include: A host computer, a heat source output device, a temperature sensor, and a battery testing device as described in any one of claims 1 to 15, wherein the host computer is wirelessly connected to the heat source output device, the heat source output device is connected to the battery testing device, the battery testing device is connected to the temperature sensor, and the temperature sensor is wirelessly connected to the host computer.

17. The battery testing system according to claim 16, characterized in that: In the case where the battery testing device includes a second heat source component, and the second heat source component includes at least one first thermal cycle component, the battery testing system further includes: A flow control valve, wherein the flow control valve comprises a plurality of ports, wherein a first port of the flow control valve is connected to the heat source output device, and the remaining ports of the flow control valve are respectively connected to the at least one first heat cycle component, and the flow control valve is wirelessly connected to the host computer.

Images