Cooling clamp for battery testing, battery testing device and battery testing method

Abstract

The invention belongs to the technical field of batteries, and discloses a cooling clamp for battery testing, a battery testing device and a battery testing method. The cooling clamp for battery testing comprises a supporting piece, the supporting piece is connected with a first clamping piece and a second clamping piece, a clamping space is formed between the first clamping piece and the second clamping piece, a to-be-tested battery is used for being clamped in the clamping space, and in the first clamping piece and the second clamping piece, the clamping space between the first clamping piece and the second clamping piece is larger than the clamping space between the first clamping piece and the second clamping piece. At least one of the heat conduction pieces is a heat conduction piece, and the heat conduction piece is matched with the to-be-tested battery in a heat exchange mode so as to absorb heat from the to-be-tested battery. The cooling clamp can clamp and fix the battery and absorb heat generated in the charging and discharging process of the battery, the temperature of the battery is prevented from being too high in the cyclic charging and discharging process of the battery, and the cycle performance, the service life and the test efficiency of the battery are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a cooling fixture for battery testing, a battery testing device and a battery testing method. Background Art

[0002] With the rapid development of the electric vehicle market, the performance and safety of battery systems have received increasing attention. Among them, the fast charge cycle performance of the battery is one of the important factors affecting the performance of the battery system. Battery fast charge cycle testing is an essential test in the battery development process. Existing battery testing systems mainly simulate the working environment of the battery to test and evaluate its performance. However, since a large amount of heat is generated during the battery fast charge cycle test, the battery temperature rises, affecting the battery cycle performance and life. Summary of the invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a cooling fixture for battery testing, a battery testing device and a battery testing method to solve the problem of increased temperature during fast charging cycles of the battery and improve the performance and cycle life of the battery.

[0004] According to a first aspect of the present invention, a cooling fixture for battery testing is provided, comprising a support member, to which a first clamping member and a second clamping member are connected, a clamping space is formed between the first clamping member and the second clamping member, and a battery to be tested is used to be clamped in the clamping space, and at least one of the first clamping member and the second clamping member is a heat conductive member, and the heat conductive member cooperates with the battery to be tested in heat exchange so as to absorb heat from the battery to be tested.

[0005] In addition, the battery testing cooling fixture of the present invention may also have the following additional technical features: As an implementable manner, the surfaces of the first clamping member and the second clamping member facing each other are clamping matching surfaces conforming to the surface of the battery to be tested, and the clamping space is formed between the clamping matching surfaces.

[0006] As an implementable manner, the opposing surfaces of the first clamping member and the second clamping member are planes, and the planes at least cover the surface of the battery to be tested.

[0007] As an implementable manner, a liquid flow channel is provided in the heat conducting member, and a cooling medium is passed through the liquid flow channel, and the cooling medium is used to cooperate with the battery to be tested in heat exchange through the heat conducting member.

[0008] As an implementable manner, both the first clamping member and the second clamping member are heat conducting members, and the liquid flow passages of the heat conducting members are connected via a transfer tube.

[0009] As an implementable manner, a groove is provided on at least one of the side walls opposite to the first clamping member and the second clamping member, a heat insulation layer and a first temperature sensor are arranged in the groove, the first temperature sensor has a signal collection surface, and the signal collection surface is arranged flush with the clamping mating surface of the first clamping member or the second clamping member, and the first temperature sensor is used to obtain the surface temperature of the battery to be tested.

[0010] As an implementable manner, a first support plate and a second support plate are sequentially arranged on a side of the second clamping member away from the first clamping member, the first support plate is slidably connected to the support member, and the second support plate is detachably connected to the support member; A pressure sensor is arranged between the first support plate and the second support plate. The pressure sensor has a sensing plane. The sensing plane contacts and cooperates with the first support plate. The pressure sensor obtains the pressure of the battery to be tested based on the pressure sensing surface.

[0011] As an achievable manner, a limiting groove is provided on the second supporting plate; The pressure sensor comprises a base body, a pressure sensing body is protruding from the base body, the pressure sensing body has the pressure sensing surface, the base body is partially assembled into the limiting groove, and is fixedly connected to the second supporting plate.

[0012] As an implementable manner, the limiting groove is a square limiting groove, and an avoidance groove for avoiding the base is arranged at a corner of the square limiting groove.

[0013] As an implementable manner, a third support plate is provided on a side of the first clamping member away from the second clamping member, and the third support plate is slidably connected to the support member.

[0014] As an implementable manner, the first clamping member and the second clamping member are provided with avoidance openings for avoiding the support member, and the support member passes through the avoidance openings of the first clamping member and the second clamping member in sequence and is slidably connected with the first clamping member and the second clamping member.

[0015] A second aspect of the present invention provides a battery testing device, comprising: a cooling device and a cooling fixture for battery testing as described in any embodiment of the present application, wherein the cooling device is connected to the heat conductive member and is used to provide a cooling medium into the heat conductive member.

[0016] As an achievable manner, a liquid flow channel is provided in the heat conducting member, and the liquid flow channel has a liquid inlet and a liquid return port; There are multiple cooling fixtures, and the liquid inlet of each cooling fixture is connected to the cooling device through a liquid inlet pipe, and the liquid return port of each cooling fixture is connected to the cooling device through a liquid return pipe.

[0017] As an implementable manner, a second temperature sensor is provided on the liquid inlet pipe, and the second temperature sensor is used to obtain the temperature of the cooling medium in the liquid inlet pipe; The liquid return pipe is provided with a third temperature sensor, and the third temperature sensor is used to obtain the temperature of the cooling medium in the liquid return pipe.

[0018] As an implementable manner, the battery testing device further includes a testing device, the signal output ends of the second temperature sensor and the third temperature sensor are electrically connected to the signal input end of the testing device, and the signal output end of the testing device is electrically connected to the control end of the cooling device; The testing device determines the liquid supply flow rate of the cooling device based on the temperature of the cooling medium in the liquid inlet pipe and the temperature of the cooling medium in the liquid return pipe.

[0019] A third aspect of the present invention provides a battery testing method, the testing method is based on the cooling fixture for battery testing described in any embodiment of the present application, or based on the battery testing device described in any embodiment of the present application, the method comprising: Clamping the battery to be tested in a clamping space formed by the first clamping member and the second clamping member, and performing a cyclic charge and discharge test on the battery to be tested; During the cyclic charge and discharge test of the battery to be tested, the heat conducting member cooperates with the battery to be tested in heat exchange to absorb the heat of the battery to be tested.

[0020] As an achievable manner, the method further includes: Acquiring the temperature of the surface of the battery to be tested, and if the temperature of the surface of the battery to be tested is greater than a first temperature threshold, controlling the cooling device to increase the liquid supply flow rate; If the temperature of the surface of the battery to be tested is lower than a second temperature threshold, controlling the cooling device to reduce the liquid supply flow rate; wherein the first temperature threshold is higher than the second temperature threshold; If the temperature of the surface of the battery to be tested is within the range of the first temperature threshold and the second temperature threshold, the cooling device is controlled to keep the liquid supply flow rate unchanged.

[0021] As an achievable manner, the method further includes: According to the quality of the battery to be tested , the heat generated by the battery under test during the cyclic charge and discharge process And the temperature change of the battery to be tested , determine the specific heat capacity of the battery to be tested for: ; According to the quality of the battery to be tested , the specific heat capacity of the battery to be tested , the initial temperature of the battery to be tested And the maximum temperature during the charge and discharge cycle , determine the maximum heat generation of the battery under test during the cyclic charge and discharge process for: ; According to the maximum heat generation of the battery under test during the cycle charge and discharge process , the specific gravity of the cooling medium provided by the cooling device and specific heat capacity , the temperature difference of the cooling medium in the liquid inlet pipe and the liquid return pipe , and the liquid supply time of the cooling device , determine the liquid supply flow rate of the cooling device for: .

[0022] As an achievable manner, the method further includes: Assume that the surface temperature of the battery to be tested is , the first temperature threshold is , the second temperature threshold is ; like , then the increase in the liquid supply flow rate of the cooling device is ; like , then the reduction in the liquid supply flow rate of the cooling device is .

[0023] According to the cooling fixture for battery testing, the battery testing device and the battery testing method provided by the present invention, the battery can be clamped by the cooling fixture, and the heat generated during the battery charging and discharging process can be absorbed to dissipate heat for the battery, thereby avoiding the battery from overheating during the battery cycle charging and discharging process, improving the battery's cycle performance and life as well as the testing efficiency, and is suitable for testing soft-pack batteries, square-shell batteries, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 A three-dimensional structural diagram of a cooling fixture for battery testing provided in an embodiment of the present application; Figure 2A side view of a cooling fixture for battery testing provided in an embodiment of the present application; Figure 3 A cross-sectional view of a cooling fixture for battery testing provided in an embodiment of the present application; Figure 4 A structural diagram of a first clamping member provided in an embodiment of the present application; Figure 5 A structural diagram of a pressure sensor provided in an embodiment of the present application; Figure 6 A structural diagram of a second support plate provided in an embodiment of the present application; Figure 7 for Figure 2 A partial enlarged view of the middle part; Figure 8 An exemplary structural diagram of a battery testing device provided in an embodiment of the present application; Fig. 9 Another exemplary structural diagram of a battery testing device provided in an embodiment of the present application; Fig.10 An exemplary flowchart of a battery testing method provided in an embodiment of the present application.

[0025] In the above picture: 100 cooling fixture; 110 first clamping member; 111 avoidance port; 112 groove; 120 second clamping member; 130 liquid flow channel; 131 liquid inlet; 132 liquid return port; 133 transfer tube; 140 support member; 150 first temperature sensor; 160 first support plate; 161 second support plate; 1611 limit groove; 1612 avoidance groove; 162 third support plate; 170 pressure sensor; 171 substrate; 172 pressure sensing body; 180 battery; 190 heat insulation layer; 200 battery testing device; 210 cooling device; 211 liquid inlet pipe; 212 liquid return pipe; 220 second temperature sensor; 230 third temperature sensor. DETAILED DESCRIPTION

[0026] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in this article refers to and includes any or all possible combinations of one or more associated listed items.

[0029] Unless the context requires otherwise, throughout the specification and claims, the term "comprising" is to be construed in an open, inclusive sense, ie, meaning "including, but not limited to."

[0030] In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" are intended to indicate that a specific feature, structure, material or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0032] refer to Figures 1 to 3 According to a first aspect of an embodiment of the present application, a cooling fixture 100 for battery testing is provided, comprising a support member 140, to which a first clamping member 110 and a second clamping member 120 are connected, a clamping space is formed between the first clamping member 110 and the second clamping member 120, and a battery to be tested 180 is used to be clamped in the clamping space, and at least one of the first clamping member 110 and the second clamping member 120 is a heat conductive member, and the heat conductive member cooperates with the battery to be tested 180 in heat exchange to absorb heat from the battery to be tested 180.

[0033] Specifically, the support member 140 may be a support rod, on which the first clamping member 110 and the second clamping member 120 are slidably mounted, and the battery 180 is clamped in the clamping space formed by the first clamping member 110 and the second clamping member 120 to fix the battery 180. The first clamping member 110 and the second clamping member 120 slide relative to the support rod, and the size of the clamping space can be adjusted to meet the test requirements of batteries 180 of different sizes and models. The first clamping member 110 and / or the second clamping member 120 are heat conductive members, so that when the battery 180 is clamped and fixed, and the battery 180 is subjected to a cycle charge and discharge test, the heat conductive member can exchange heat with the battery 180 to absorb the heat generated by the battery 180 and improve the heat dissipation effect of the battery 180. Among them, the battery 180 to be tested may be a lithium battery 180, a lead-acid battery 180, etc. The heat conductive member is made of a material with good thermal conductivity, including but not limited to metal materials such as aluminum alloy, aluminum, iron, copper, and steel.

[0034] It can be understood that the first clamping member 110 or the second clamping member 120 is a heat conductive member, which can achieve single-sided cooling and heat dissipation of the battery 180; the first clamping member 110 and the second clamping member 120 are both heat conductive members, which can achieve double-sided cooling and heat dissipation of the battery 180, and the heat dissipation effect is better.

[0035] The cooling fixture 100 provided in the embodiment of the present application is used for the cyclic charge and discharge test of the battery 180. The cooling fixture 100 can clamp the battery 180 and absorb the heat generated during the charge and discharge process of the battery 180 to perform heat dissipation treatment on the battery 180, thereby preventing the battery 180 from overheating during the cyclic charge and discharge process of the battery 180, thereby improving the cycle performance and life of the battery 180 and the test efficiency. The cooling fixture 100 is suitable for testing soft-pack batteries 180, square-shell batteries 180, etc.

[0036] As an implementable manner, the opposing surfaces of the first clamping member 110 and the second clamping member 120 are clamping matching surfaces conforming to the surface of the battery to be tested 180 , and the clamping space is formed between the clamping matching surfaces.

[0037] Specifically, the clamping mating surface is set according to the shape of the battery 180 to meet the fixation and heat dissipation requirements of batteries 180 of different shapes. Exemplarily, the clamping mating surface can be a plane, a curved surface or an irregular surface.

[0038] As an implementable method, refer to Figures 1 to 3 The opposing surfaces of the first clamping member 110 and the second clamping member 120 are planes, and the planes at least cover the surface of the battery to be tested 180 .

[0039] In this example, the clamping mating surface is a plane to clamp and fix the square battery 180, and the plane at least covers the surface of the battery 180, increasing the contact area between the heat conductor and the surface of the battery 180, thereby improving the heat dissipation effect on the battery 180.

[0040] As an implementable method, refer to Figures 1 to 4 The heat conducting member is provided with a liquid channel 130 , and the liquid channel 130 is used to pass a cooling medium, and the cooling medium is used to cooperate with the battery to be tested 180 in heat exchange through the heat conducting member.

[0041] Specifically, the liquid flow channel 130 is arranged through the heat conducting member, and the two ends extending out of the heat conducting member are respectively provided with a liquid inlet 131 and a liquid return port 132, and the liquid inlet 131 and the liquid return port 132 are both connected to the cooling device 210, and the cooling medium is circulated into the liquid flow channel 130 through the cooling device 210, and the cooling medium cooperates with the battery 180 through the heat conducting member to continuously cool and dissipate heat for the battery 180, so as to avoid the battery 180 from being overheated. Among them, the cooling medium can be water, air, hydrogen, nitrogen, etc.

[0042] As an implementable method, refer to Figure 2 The first clamping member 110 and the second clamping member 120 are both heat-conducting members, and the liquid flow channels 130 of the heat-conducting members are connected through a transfer tube 133.

[0043] In this example, the first clamping member 110 and the second clamping member 120 are both heat-conducting members, which may be heat-conducting plates. Liquid flow channels 130 are disposed in both heat-conducting plates, and the two liquid flow channels 130 are connected via a transfer tube 133. Through the cooperation between the liquid flow channels 130 and the transfer tube 133, the cooling medium can circulate through the upper and lower surfaces of the battery 180, thereby improving the cooling and heat dissipation efficiency of the battery 180.

[0044] As an implementable method, refer to Figure 2 and Figure 7 A groove 112 is provided on at least one of the side walls opposite to the first clamping member 110 and the second clamping member 120. A heat insulating layer 190 and a first temperature sensor 150 are arranged in the groove 112. The first temperature sensor 150 has a signal collection surface, and the signal collection surface is arranged flush with the clamping mating surface of the first clamping member 110 or the second clamping member 120. The first temperature sensor 150 is used to obtain the surface temperature of the battery 180 to be tested.

[0045] In this example, a groove 112 is provided on the side wall opposite to the first clamp 110 or / and the second clamp 120, and a heat insulating layer 190 and a first temperature sensor 150 are fixedly assembled in the groove 112, for example, by gluing, screwing, riveting, welding, etc. The heat insulating layer 190 is made of heat insulating silica gel, etc., and the shape of the heat insulating layer 190 and the groove 112 is matched with the shape. For example, the groove 112 is a U-shaped groove, and the corresponding heat insulating layer 190 is a U-shaped heat insulating layer. The setting of the heat insulating layer 190 can prevent the first temperature sensor 150 from directly contacting the first clamp 110 and the second clamp 120, and avoid the influence of the first clamp 110 and the second clamp 120 on the temperature measurement of the first temperature sensor 150. The first temperature sensor 150 has a signal collection surface, which is flush with the clamping mating surface of the first clamp 110 or the second clamp 120, so that when the first clamp 110 and the second clamp 120 clamp the battery, the signal collection surface of the first temperature sensor 150 can be directly attached to the surface of the battery to obtain the temperature of the battery surface. The first clamp 110 is located above the second clamp 120, and the first temperature sensor 150 located in the groove 112 of the first clamp 110 is used to obtain the temperature of the upper surface of the battery 180, and the first temperature sensor 150 located in the groove 112 of the second clamp 120 is used to obtain the temperature of the lower surface of the battery 180.

[0046] As an implementable method, refer to Figures 1 to 3 A first support plate 160 and a second support plate 161 are sequentially arranged on a side of the second clamping member 120 away from the first clamping member 110, the first support plate 160 is slidably connected to the support member 140, and the second support plate 161 is detachably connected to the support member 140; A pressure sensor 170 is disposed between the first support plate 160 and the second support plate 161 . The pressure sensor 170 has a sensing plane that contacts and cooperates with the first support plate 160 . The pressure sensor 170 obtains the pressure of the battery to be tested 180 based on the pressure sensing surface.

[0047] The first support plate 160 is slidably connected to the support member 140. The slidably connected means that the first support plate 160 is provided with a through-mounting hole, and the support member 140 is slidably connected to the first support plate 160 through the mounting hole, so that the first support plate 160 can slide relative to the support member 140. The first support plate 160 can support the second clamping member 120 to ensure the stability of the second clamping member 120. The second support plate 161 is detachably connected to the support member 140, such as by screw connection, plug-in matching, etc.

[0048] The pressure sensor 170 is fixedly arranged between the first support plate 160 and the second support plate 161. The upper end surface of the pressure sensor 170 is a pressure sensing surface, and the pressure sensing surface contacts and cooperates with the first support plate 160. The expansion force, contraction force, etc. generated by the battery 180 during the charge and discharge cycle can be obtained through the pressure sensing surface, thereby realizing the monitoring of the pressure of the battery 180 during the cyclic charge and discharge process.

[0049] Further, as an implementable method, refer to Figure 5 and Figure 6 The second support plate 161 is provided with a limiting groove 1611; the pressure sensor 170 includes a base 171, the base 171 is protrudingly provided with a pressure sensing body 172, the pressure sensing body 172 has the pressure sensing surface, the base 171 is partially assembled into the limiting groove 1611, and is fixedly connected to the second support plate 161.

[0050] Specifically, the bottom end of the base 171 is fixed in the limiting groove 1611 of the second support plate 161 by bolts, and a pressure sensing body 172 is protruding from the upper end of the base 171. The pressure sensing body 172 has a pressure sensing surface on the side away from the base 171, and the pressure of the battery 180 to be tested can be obtained through the pressure sensing surface.

[0051] As an implementable method, refer to Figure 6 The limiting groove 1611 is a square limiting groove 1611 , and an avoidance groove 1612 for avoiding the base 171 is arranged at a corner of the square limiting groove 1611 .

[0052] In this example, the base 171 is a square base 171, and the limiting groove 1611 is a square limiting groove 1611 that matches the shape of the base 171, so that the base 171 can be fixedly assembled in the limiting groove 1611 in an embedded manner, and the square limiting groove 1611 is provided with avoidance grooves 1612 at the four corners to avoid the base 171, so as to avoid damage to the pressure sensor 170.

[0053] As an implementable method, refer to Figures 1 to 3 A third support plate 162 is disposed on a side of the first clamping member 110 away from the second clamping member 120 , and the third support plate 162 is slidably connected to the support member 140 .

[0054] Specifically, a first support plate 160 and a third support plate 162 are respectively provided on the side away from the first clamping member 110 and the second clamping member 120. The first support plate 160 and the third support plate 162 are both slidably connected to the support member 140, so that the size of the clamping space can be adjusted. Through the cooperation of the first support plate 160 and the third support plate 162, a stable support can be formed for the first clamping member 110 and the second clamping member 120, ensuring that the temperature of the battery 180 to be tested is fixed in the clamping space formed by the first clamping member 110 and the second clamping member 120.

[0055] As an implementable method, refer to Figure 4 The first clamping member 110 and the second clamping member 120 are provided with an escape opening 111 for avoiding the support member 140. The support member 140 passes through the escape opening 111 of the first clamping member 110 and the second clamping member 120 in sequence, and is slidably connected with the first clamping member 110 and the second clamping member 120.

[0056] Specifically, the first clamping member 110 and the second clamping member 120 cooperate with each other through the first support plate 160 and the third support plate 162 to limit and support them. Therefore, the first clamping member 110 and the second clamping member 120 are provided with avoidance openings 111 on the edges thereof, so that the support member 140 passes through the corresponding avoidance openings 111 and is slidably connected with the first clamping member 110 and the second clamping member 120.

[0057] In the embodiment of the present application, there are at least two support members 140, preferably 3-4, to provide strong support for the first clamping member 110 and the second clamping member 120. It is understandable that the upper end of the support member 140 may have an external thread and be equipped with a nut matching the external thread, so as to lock and fix the first support plate 160, the second support plate 161 and the third support plate 162, and the second support plate 161 may also be locked and fixed by a snap-fit ​​method.

[0058] The second aspect of the present invention, referring to Figure 8 and Fig. 9 , a battery testing device 200 is provided, the battery testing device 200 comprises: a cooling device 210 and a cooling fixture 100 for battery testing as described in any embodiment of the present application, the cooling device 210 is connected to the heat conductive member and is used to provide a cooling medium into the heat conductive member.

[0059] The cooling device 210 can be a water chiller, which is connected to the liquid inlet 131 and the liquid return port 132 of the liquid flow channel 130 in the heat-conducting member. For example, a single-stage refrigeration structure that undergoes one evaporation and condensation process is adopted, which has only one refrigeration system of a refrigeration unit, mainly including a compressor, a condenser, a throttle valve and an evaporator. The compressor compresses the low-temperature and low-pressure gas into a high-temperature and high-pressure gas, the condenser changes the high-temperature and high-pressure gas discharged from the compressor into a low-temperature and high-pressure liquid, the throttle valve changes the low-temperature and high-pressure liquid discharged from the condenser into a low-temperature and low-pressure liquid, and the low-temperature and low-pressure liquid enters the evaporator, and the low-temperature and low-pressure liquid evaporates and absorbs heat, so that the surface temperature of the evaporator is reduced. Among them, the evaporator is a key component of the water chiller. It absorbs heat and reduces the water temperature by heat exchange with cold water, and then sends low-temperature water into the liquid flow channel 130 to cool and dissipate heat for the battery 180.

[0060] The specific technical features and technical effects of the battery testing device 200 provided in the embodiment of the present application are consistent with the technical features and technical effects of the cooling fixture 100 for battery testing described in any embodiment of the present application, and will not be repeated in the embodiment of the present application.

[0061] As an implementable method, refer to Fig. 9 A liquid flow channel 130 is provided in the heat conducting member, and the liquid flow channel 130 has a liquid inlet 131 and a liquid return port 132; There are multiple cooling fixtures 100 , and the liquid inlet 131 of each cooling fixture 100 is connected to the cooling device 210 through a liquid inlet pipe 211 , and the liquid return port 132 of each cooling fixture 100 is connected to the cooling device 210 through a liquid return pipe 212 .

[0062] In this example, there are multiple cooling fixtures 100, and the liquid inlets 131 of the multiple cooling fixtures 100 are connected to the cooling device 210 through the same liquid inlet pipe 211, and the liquid return ports 132 of the multiple cooling fixtures 100 are connected to the cooling device 210 through the same liquid return pipe 212, thereby reducing the number of components of the liquid inlet pipe 211, the liquid return pipe 212 and the cooling device 210, saving costs, and realizing cyclic charge and discharge testing of multiple batteries 180 at one time, realizing cooling and heat dissipation treatment of multiple batteries 180, and improving the testing efficiency of the battery 180.

[0063] It is understandable that conventional components such as a water pump and a stop valve may be provided on the liquid inlet pipe 211 and the liquid return pipe 212 .

[0064] As an implementable method, refer to Figure 8 , a second temperature sensor 220 is provided on the liquid inlet pipe 211, and the second temperature sensor 220 is used to obtain the temperature of the cooling medium in the liquid inlet pipe 211; The liquid return pipe 212 is provided with a third temperature sensor 230 , and the third temperature sensor 230 is used to obtain the temperature of the cooling medium in the liquid return pipe 212 .

[0065] In this example, the second temperature sensor 220 and the third temperature sensor 230 can monitor the temperature of the cooling medium in the liquid inlet pipe 211 and the liquid return pipe 212 in real time, and the temperature information obtained based on the second temperature sensor 220 and the third temperature sensor 230 is conducive to the subsequent precise adjustment of the liquid supply amount of the cooling device 210.

[0066] It should be noted that a pressure sensor 170 is provided on the liquid inlet pipe 211 and / or the liquid return pipe 212. The pressure sensor 170 can monitor the pressure of the cooling medium in the liquid inlet pipe 211 and the liquid return pipe 212 in real time to ensure that the pressure is always within a controllable range.

[0067] Further, the battery testing device 200 also includes a testing device, the signal output ends of the second temperature sensor 220 and the third temperature sensor 230 are electrically connected to the signal input end of the testing device, and the signal output end of the testing device is electrically connected to the control end of the cooling device 210; The testing device determines the liquid supply flow rate of the cooling device 210 based on the temperature of the cooling medium in the liquid inlet pipe 211 and the temperature of the cooling medium in the liquid return pipe 212 .

[0068] Specifically, the signal output ends of the first temperature sensor 150, the second temperature sensor 220, and the third temperature sensor are all electrically connected to the signal input end of the test equipment. The test equipment can determine whether to increase or decrease the liquid supply flow rate of the cooling device 210 based on the temperature information on the surface of the battery 180 obtained by the first temperature sensor 150, and then with the temperature information obtained by the second temperature sensor 220 and the third temperature sensor 230, it can accurately determine the liquid supply flow rate of the cooling device 210, so that the temperature on the surface of the battery 180 is always kept within a controllable range, further improving the cycle charge and discharge performance and life of the battery 180. The signal output end of the pressure sensor 170 is electrically connected to the signal input end of the test equipment, and the test equipment can monitor the pressure of the battery 180 in real time through the pressure sensor 170.

[0069] It is understandable that the test equipment is a conventional equipment in this field, which can detect the basic parameters of the battery 180, such as measuring the voltage, current, internal resistance, charging and discharging performance, capacity and other basic parameters of the battery 180 to ensure that the performance of the battery 180 meets the standards; by simulating extreme environments, such as high temperature, short circuit and other conditions, the test equipment can evaluate the safety performance of the battery 180 to ensure the stability and safety of the battery 180 under various harsh conditions; and through precise data collection and analysis, the test equipment can optimize the management strategy of the battery 180, improve the cycle life and use efficiency of the battery 180, and extend the service life of the battery 180. ‌‌‌

[0070] In a third aspect of the present invention, a battery testing method 300 is provided. The testing method is based on the cooling fixture 100 for battery testing described in any embodiment of the present application, or based on the battery testing device 200 described in any embodiment of the present application, and the method includes: S310: clamping the battery to be tested 180 in the clamping space formed by the first clamping member 110 and the second clamping member 120, and performing a cyclic charge and discharge test on the battery to be tested 180; S320 : During the cyclic charge and discharge test of the battery to be tested 180 , the heat conductive element cooperates with the battery to be tested 180 in heat exchange to absorb the heat of the battery to be tested 180 .

[0071] In this example, the battery 180 is clamped and fixed by the clamping space formed by the first clamping member 110 and the second clamping member 120, and the heat generated during the charging and discharging process of the battery 180 is absorbed by the heat conductive member to dissipate heat for the battery 180, thereby preventing the battery 180 from overheating during the cyclic charging and discharging process of the battery 180, and improving the cycle performance and life of the battery 180 as well as the test efficiency.

[0072] The specific technical features and technical effects of the battery testing method provided in the embodiment of the present application are the same as those of the cooling fixture 100 for battery testing and the battery testing device 200, and will not be described in detail in this application.

[0073] As an implementable method, refer to Fig.10 , the method 300 further includes: Acquire the surface temperature of the battery to be tested 180, and if the surface temperature of the battery to be tested 180 is greater than a first temperature threshold, control the cooling device 210 to increase the liquid supply flow rate; If the temperature of the surface of the battery to be tested 180 is lower than a second temperature threshold, the cooling device 210 is controlled to reduce the liquid supply flow rate; wherein the first temperature threshold is higher than the second temperature threshold; If the temperature of the surface of the battery to be tested 180 is within the range of the first temperature threshold and the second temperature threshold, the cooling device 210 is controlled to keep the liquid supply flow rate unchanged.

[0074] Specifically, when the temperature of the surface of the battery 180 obtained by the first temperature sensor 150 is greater than the first temperature threshold, the test equipment program controls the cooling device 210 to increase the liquid supply flow rate to quickly cool down and dissipate heat for the battery 180 until the temperature of the surface of the battery 180 monitored by the first temperature sensor 150 is less than or equal to the first temperature threshold; when the temperature of the surface of the battery 180 obtained by the first temperature sensor 150 is less than the second temperature threshold, the test equipment program controls the cooling device 210 to reduce the liquid supply flow rate to gently cool down and dissipate heat for the battery 180 until the temperature of the surface of the battery 180 monitored by the first temperature sensor 150 is greater than or equal to the second temperature threshold, thereby ensuring that the temperature of the surface of the battery 180 is always between the first temperature threshold and the second temperature threshold, thereby achieving temperature control during the fast charge cycle test of the battery 180 and improving the fast charge cycle test performance of the battery 180.

[0075] For example, during the battery test, the temperature is required to be controlled at T±5°C, where T is the battery cycle test temperature, T is between 20 and 40°C, then the first temperature threshold is T+5°C, and the second temperature threshold is T-5°C. Those skilled in the art may also set the first temperature threshold and the second temperature threshold to other values ​​according to actual needs, and this application does not specifically limit this.

[0076] In this example, the signal output end of the first temperature sensor 150 is electrically connected to the signal input end of the test equipment to realize real-time monitoring of the surface temperature of the battery 180; the signal output end of the test equipment is electrically connected to the control end of the cooling equipment 210 to realize the linkage control of the test equipment and the cooling equipment 210, thereby achieving temperature control during the fast charging cycle test of the battery 180 and improving the fast charging cycle test performance of the battery 180.

[0077] It should be noted that the surface temperature of the battery 180 may be the temperature of the upper surface of the battery 180 or the temperature of the lower surface of the battery 180. For example, if the temperature of the upper surface of the battery 180 is , the temperature of the lower surface of battery 180 is ,like or Greater than the first temperature threshold T+5°C, where and If the temperature is higher, the cooling device 210 increases the liquid supply flow rate; or Less than the second temperature threshold T-5°C, where and When the temperature is lower, the cooling device 210 reduces the liquid supply flow rate.

[0078] As an implementable manner, the method 300 further includes: S330: Based on the quality of the battery 180 to be tested , the heat generated by the battery 180 to be tested during the cyclic charge and discharge process and the temperature change of the battery 180 to be tested , determine the specific heat capacity of the battery to be tested 180 for: ; S340: Based on the quality of the battery 180 to be tested , the specific heat capacity of the battery 180 to be tested , the initial temperature of the battery to be tested 180 And the maximum temperature during the charge and discharge cycle , determine the maximum heat generation of the battery 180 to be tested during the cyclic charge and discharge process for: ; S350: according to the maximum heat generation of the battery to be tested 180 during the cyclic charge and discharge process , the specific gravity of the cooling medium provided by the cooling device 210 and specific heat capacity , the temperature difference of the cooling medium in the liquid inlet pipe 211 and the liquid return pipe 212 , and the liquid supply time of the cooling device 210 , determine the liquid supply flow rate of the cooling device 210 for: .

[0079] In this example, in S330, the specific heat capacity of the battery 180 is determined. : Through the adiabatic temperature rise experiment, the heat generated by the battery 180 is obtained , and then weigh the mass of the battery 180 , calculate the heat generated during the battery 180 fast charge cycle according to the following formula ,in, is the change in temperature rise during the fast charge cycle of the battery 180. According to the above formula, the specific heat capacity of the battery 180 can be determined. .

[0080] In S340, the maximum heat generation of the battery 180 under the conventional test is determined. : The battery 180 is subjected to a fast charge cycle test in an oven, and the initial temperature of the battery 180 is recorded during the test. And the maximum temperature during the charge and discharge cycle , then the maximum heat generated by the battery 180 during the cyclic charge and discharge process is for: .

[0081] In S350, the flow rate of the cooling medium in the cooling device 210 is determined. : According to the cooling capacity calculation formula of cooling device 210: ,in, represents the load, i.e., the maximum heat generation of the battery 180; Indicates the specific heat capacity of the cooling medium. For example, if the cooling medium is water, the specific heat capacity of water is 4.184 J / (kg·℃); Indicates the specific gravity of the cooling medium, such as the specific gravity of water is 1000 Kg / m3; Indicates the cooling medium supply flow rate (such as water flow), in m³ / h; represents the temperature difference between the cooling medium in the liquid inlet pipe 211 and the liquid return pipe 212, which is set by the cooling device 210, wherein the temperature of the cooling medium in the liquid inlet pipe 211 is obtained by the second temperature sensor 220, and the temperature of the cooling medium in the liquid return pipe 212 is obtained by the third temperature sensor 230; Indicates the liquid supply time of the cooling device 210, in hours. According to the cooling capacity calculation formula of the cooling device 210, the liquid supply flow rate of the cooling device 210 is for: .

[0082] As an achievable manner, the method further includes: Assume that the surface temperature of the battery 180 to be tested is , the first temperature threshold is , the second temperature threshold is ; like , then the increase in the liquid supply flow rate of the cooling device 210 is ; like , then the reduction in the liquid supply flow rate of the cooling device 210 is .

[0083] For example, if the temperature of the surface of the battery 180 is , such as the temperature of the upper surface of battery 180 is , the temperature of the lower surface of battery 180 is ,like or Greater than the first temperature threshold (like =T+5°C), the cooling device 210 increases the liquid supply flow rate, and the increase in the liquid supply flow rate is ;in, Pick and Medium temperature higher value, such as Greater than ,but equal .like or Less than the second temperature threshold (like =T-5°C), the cooling device 210 reduces the liquid supply flow rate, and the reduction in the liquid supply flow rate is ;in, Pick and Medium temperature lower value.

[0084] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other to form a technical solution.

Claims

1. A cooling fixture (100) for battery testing, characterized in that: The invention comprises a support member (140), a first clamping member (110) and a second clamping member (120) being connected to the support member (140), a clamping space being formed between the first clamping member (110) and the second clamping member (120), a battery to be tested (180) being used to be clamped in the clamping space, and at least one of the first clamping member (110) and the second clamping member (120) being a heat conductive member, the heat conductive member being in heat exchange cooperation with the battery to be tested (180) so as to absorb heat from the battery to be tested (180).

2. The battery testing cooling fixture (100) according to claim 1, characterized in that: The surfaces opposite to each other of the first clamping member (110) and the second clamping member (120) are clamping matching surfaces conforming to the surface of the battery to be tested (180), and the clamping space is formed between the clamping matching surfaces.

3. The battery testing cooling fixture (100) according to claim 2, characterized in that: The opposing surfaces of the first clamping member (110) and the second clamping member (120) are planes, and the planes at least cover the surface of the battery to be tested (180).

4. The battery testing cooling fixture (100) according to claim 1, characterized in that: A liquid flow channel (130) is provided in the heat conducting member, and a cooling medium is passed through the liquid flow channel (130). The cooling medium is used to exchange heat with the battery to be tested (180) through the heat conducting member.

5. The battery testing cooling fixture (100) according to claim 4, characterized in that: The first clamping member (110) and the second clamping member (120) are both heat-conducting members, and the liquid flow channels (130) of the heat-conducting members are connected via a transfer tube (133).

6. The battery testing cooling fixture (100) according to claim 1, characterized in that: A groove (112) is provided on at least one of the side walls opposite to the first clamping member (110) and the second clamping member (120); a heat insulating layer (190) and a first temperature sensor (150) are arranged in the groove (112); the first temperature sensor (150) has a signal collection surface, the signal collection surface is arranged flush with a clamping mating surface of the first clamping member (110) or the second clamping member (120); the first temperature sensor (150) is used to obtain the surface temperature of the battery (180) to be tested.

7. The battery testing cooling fixture (100) according to claim 1, characterized in that: A first support plate (160) and a second support plate (161) are sequentially arranged on a side of the second clamping member (120) away from the first clamping member (110); the first support plate (160) is slidably connected to the support member (140); and the second support plate (161) is detachably connected to the support member (140); A pressure sensor (170) is provided between the first support plate (160) and the second support plate (161); the pressure sensor (170) has a sensing plane, the sensing plane is in contact with the first support plate (160), and the pressure sensor (170) obtains the pressure of the battery to be tested (180) based on the pressure sensing surface.

8. The battery testing cooling fixture (100) according to claim 7, characterized in that: The second support plate (161) is provided with a limiting groove (1611); The pressure sensor (170) comprises a base (171), a pressure sensing body (172) protruding from the base (171), the pressure sensing body (172) having the pressure sensing surface, the base (171) being partially assembled into the limiting groove (1611) and fixedly connected to the second support plate (161).

9. The battery testing cooling fixture (100) according to claim 8, characterized in that: The limiting groove (1611) is a square limiting groove, and a avoiding groove (1612) for avoiding the base body (171) is provided at a corner of the square limiting groove.

10. The battery testing cooling fixture (100) according to claim 7, characterized in that: A third support plate (162) is provided on a side of the first clamping member (110) away from the second clamping member (120), and the third support plate (162) is slidably connected to the support member (140).

11. The cooling fixture (100) for battery testing according to any one of claims 1 to 10, characterized in that: The first clamping member (110) and the second clamping member (120) are provided with avoidance openings (111) for avoiding the support member (140); the support member (140) passes through the avoidance openings (111) of the first clamping member (110) and the second clamping member (120) in sequence, and is slidably connected with the first clamping member (110) and the second clamping member (120).

12. A battery testing device (200), characterized in that: The battery testing device (200) comprises: a cooling device (210) and a battery testing cooling fixture (100) according to any one of claims 1 to 11, wherein the cooling device (210) is connected to the heat conducting member and is used to provide a cooling medium into the heat conducting member.

13. The battery testing device (200) according to claim 12, characterized in that: A liquid flow channel (130) is provided in the heat conducting member, and the liquid flow channel (130) has a liquid inlet (131) and a liquid return port (132); There are a plurality of cooling fixtures (100), and the liquid inlet (131) of each cooling fixture (100) is connected to the cooling device (210) via a liquid inlet pipe (211), and the liquid return port (132) of each cooling fixture (100) is connected to the cooling device (210) via a liquid return pipe (212).

14. The battery testing device (200) according to claim 13, characterized in that: The liquid inlet pipe (211) is provided with a second temperature sensor (220), and the second temperature sensor (220) is used to obtain the temperature of the cooling medium in the liquid inlet pipe (211); The liquid return pipe (212) is provided with a third temperature sensor (230), and the third temperature sensor (230) is used to obtain the temperature of the cooling medium in the liquid return pipe (212).

15. The battery testing device (200) according to claim 14, characterized in that: The battery testing device (200) further comprises a testing device, the signal output ends of the second temperature sensor (220) and the third temperature sensor (230) are electrically connected to the signal input end of the testing device, and the signal output end of the testing device is electrically connected to the control end of the cooling device (210); The testing device determines the liquid supply flow rate of the cooling device (210) based on the temperature of the cooling medium in the liquid inlet pipe (211) and the temperature of the cooling medium in the liquid return pipe (212).

16. A battery testing method, characterized in that: The testing method is based on the cooling fixture (100) for battery testing according to any one of claims 1 to 11, or based on the battery testing device (200) according to any one of claims 12 to 15, and the method comprises: Clamping the battery to be tested in a clamping space formed by the first clamping member and the second clamping member, and performing a cyclic charge and discharge test on the battery to be tested; During the cyclic charge and discharge test of the battery to be tested, the heat conducting member cooperates with the battery to be tested in heat exchange to absorb the heat of the battery to be tested.

17. The battery testing method according to claim 16, characterized in that: The method further comprises: Acquiring the temperature of the surface of the battery to be tested, and if the temperature of the surface of the battery to be tested is greater than a first temperature threshold, controlling the cooling device to increase the liquid supply flow rate; If the temperature of the surface of the battery to be tested is lower than a second temperature threshold, controlling the cooling device to reduce the liquid supply flow rate; wherein the first temperature threshold is higher than the second temperature threshold; If the temperature of the surface of the battery to be tested is within the range of the first temperature threshold and the second temperature threshold, the cooling device is controlled to keep the liquid supply flow rate unchanged.

18. The battery testing method according to claim 17, characterized in that: The method further comprises: According to the quality of the battery to be tested , the heat generated by the battery under test during the cyclic charge and discharge process And the temperature change of the battery to be tested , determine the specific heat capacity of the battery to be tested for: ; According to the quality of the battery to be tested , the specific heat capacity of the battery to be tested , the initial temperature of the battery to be tested And the maximum temperature during the charge and discharge cycle , determine the maximum heat generation of the battery under test during the cyclic charge and discharge process for: ; According to the maximum heat generation of the battery under test during the cycle charge and discharge process , the specific gravity of the cooling medium provided by the cooling device and specific heat capacity , the temperature difference of the cooling medium in the liquid inlet pipe and the liquid return pipe , and the liquid supply time of the cooling device , determine the liquid supply flow rate of the cooling device for: .

19. The battery testing method according to claim 18, characterized in that: The method further comprises: Assume that the surface temperature of the battery to be tested is , the first temperature threshold is , the second temperature threshold is ; like , then the increase in the liquid supply flow rate of the cooling device is ; like , then the reduction in the liquid supply flow rate of the cooling device is .

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