Device with battery tab cooling and calorific value measuring functions

Abstract

The utility model relates to a device with battery tab cooling and calorific value measuring functions. The device comprises a tab cooling module and a calorific value measuring module, a battery to be measured is located in the calorific value measuring module, a tab of the battery to be measured is connected with the calorific value measuring module, the tab cooling module comprises a cooling assembly and an insulation cooling plate located in the calorific value measuring module, and the insulation cooling plate is connected with the output end of the cooling assembly. And the lead is fixedly connected and tightly contacted with a tab of the battery to be detected. Compared with the prior art, the battery calorific value measuring device has the advantages of improving the battery calorific value measuring precision, prolonging the service life of the battery and the like.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, and in particular to a device that combines battery tab cooling and heat generation measurement. Background Technology

[0002] In recent years, the new energy vehicle industry has experienced rapid development, achieving a world-leading scale. The rapid advancement of fast-charging technology for new energy vehicles has placed higher demands on battery charge / discharge rate performance. Fast-charging batteries generate a significant amount of heat during charging and discharging, posing challenges to battery thermal management technology.

[0003] Batteries generate a significant amount of heat during charging and discharging, with varying heat generation at different locations within the battery. For instance, during individual cell heat generation power testing, the temperature at the electrode tabs exceeded that of the battery surface. Furthermore, due to the layered structure of the battery and differences in the thermal properties of its main materials, individual cells exhibit significant anisotropy in heat transfer. For example, there is an order-of-magnitude difference in thermal conductivity between the direction perpendicular to and parallel to the battery electrodes.

[0004] Currently, testing for battery charging and discharging heat generation typically involves using an adiabatic accelerated calorimeter or isothermal calorimeter to measure adiabatic temperature rise or compensated power. However, adiabatic temperature rise testing does not control the battery temperature during the process; battery heat generation and some tab heat generation are both included in the temperature rise. Isothermal calorimetry generally performs large-area heat dissipation isothermal testing, failing to distinguish between tab heat and battery heat, resulting in a large internal temperature gradient within the battery and making it impossible to measure battery heat generation power in real time. Meanwhile, common cooling methods for new energy vehicles include bottom water cooling, large-area water cooling, and a combination of both. However, all these common cooling methods suffer from uneven heat dissipation: bottom cooling generally has a limited contact area between the water cooling plate and the battery casing, while large-area cooling is affected by the battery's large-area thermal conductivity, resulting in significant differences in heat dissipation efficiency. This leads to temperature gradients within the battery, which in turn causes differences in internal conductivity, resulting in inconsistent battery degradation and affecting battery life. For example, Chinese patent CN105548891A discloses a battery heat testing device and method, which conducts heat testing during the charging and discharging process in a constant temperature chamber and uses a coolant circulation system to conduct the heat generated by the battery under test to the outside of the insulation room, thereby obtaining the cumulative heat consumption of the battery under test during the charging and discharging process. However, this solution does not distinguish between battery heat generation and partial tab heat generation, nor does it consider the problem of temperature gradients inside the battery.

[0005] Therefore, how to distinguish between battery heat generation and tab heat generation during battery charging and discharging heat generation tests in order to improve measurement accuracy, alleviate the temperature gradient inside the battery, and improve battery life has become a problem that needs to be solved in this field. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of the prior art, which does not distinguish between battery heat generation and partial tab heat generation, nor does it consider the temperature gradient inside the battery, and to provide a device that combines battery tab cooling and heat generation measurement.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] This utility model provides a device that combines battery tab cooling and heat generation measurement, including a tab cooling module and a heat generation measurement module. The battery under test is located in the heat generation measurement module and the tab of the battery under test is connected to the heat generation measurement module. The tab cooling module includes a cooling component and an insulating cooling plate located in the heat generation measurement module. The insulating cooling plate is connected to the output end of the cooling component and is fixedly connected to and in close contact with the tab of the battery under test.

[0009] As a preferred technical solution, the insulating cooling plate is fixedly connected to the tabs of the battery under test by insulating tape or insulating clips.

[0010] As a preferred technical solution, the cooling assembly includes a cooler, a first coolant pipe, and a second coolant pipe connected in sequence. The first coolant pipe and the second coolant pipe are located outside and inside the heat generation measurement module, respectively, and the output end of the second coolant pipe is connected to the insulating cooling plate.

[0011] As a preferred technical solution, the first coolant pipeline is provided with a switch control element.

[0012] As a preferred technical solution, both the first coolant pipe and the second coolant pipe are provided with an external heat insulation layer.

[0013] As a preferred technical solution, a thermally conductive calorimeter is placed between the insulating cooling plate and the tab of the battery under test.

[0014] As a preferred technical solution, the heat generation measurement module includes a calorimeter, a charge / discharge machine, a first wire, and a second wire. The battery under test is located inside the calorimeter, and the charge / discharge machine is located outside the calorimeter and is connected to the tabs of the battery under test through the first wire and the second wire, respectively.

[0015] As a preferred technical solution, the calorific value measurement module further includes a control host, which is communicatively connected to the calorimeter.

[0016] As a preferred technical solution, the calorimeter includes a measuring body and a top cover, the top cover being placed on top of the measuring body and equipped with a sensor.

[0017] As a preferred technical solution, the calorimeter is an adiabatic accelerated calorimeter or an isothermal calorimeter.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The device provided by this utility model adds a tab cooling module to the heat generation test module. The output end of the cooling component in this module is connected to the insulating cooling plate located in the heat generation measurement module. The insulating cooling plate is fixedly connected to and in close contact with the tab of the battery under test. Together with the cooling component, it cools down the battery tab. At the same time, the heat generation test module realizes the battery heat generation test. It can realize two processes at the same time. During the battery charge and discharge heat generation test, it can quickly and efficiently distinguish between battery heat generation and tab heat generation, thereby improving the accuracy of heat generation measurement. At the same time, the targeted cooling of the tab can alleviate the temperature gradient inside the battery during the charge and discharge process and improve the battery life.

[0020] 2. This utility model uses insulating tape or insulating clips to fix the insulating cooling plate to the electrode tab, so that the two make good contact. When the cooling machine is turned on for cooling circulation, it can ensure the cooling effect of the electrode tab and ensure the accuracy of heat generation measurement during charging and discharging.

[0021] 3. This utility model uses a cooling machine to set a cooling temperature to cool the battery tabs, and a charge / discharge machine to charge or discharge the battery according to predetermined steps. By using this utility model for testing, and based on the setting of the cooling temperature and charge / discharge steps, we can summarize and generalize the heat generation power under specific tab cooling conditions, the charge / discharge strategies matched with different tab cooling temperatures, the management strategy that balances the tab cooling temperature, the charge / discharge strategy and the internal temperature gradient of the battery, and the charge / discharge strategies that match different tab cooling temperatures and flow rates, thereby improving the thermal management method of the battery. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the device in an embodiment of the present invention;

[0023] Figure 2 This is a partial enlarged view of the battery under test located inside the adiabatic accelerated calorimeter in an embodiment of this utility model;

[0024] Wherein: 100, battery under test; 101, adiabatic accelerated calorimeter; 102, charge / discharge machine; 103, first lead wire; 104, second lead wire; 1011, measuring body; 1012, top cover; 1013, sensor; 105, control host; 106, insulating cooling plate; 107, cooling machine; 108, first coolant pipe; 109, second coolant pipe; 110, valve. Detailed Implementation

[0025] Tab cooling effectively reduces the internal temperature gradient of the battery, improves the uniformity of internal current and SOC, and extends battery cycle life. It effectively addresses the problems existing in current battery cooling methods. When rationally applied to battery charge / discharge heat generation testing, it can effectively distinguish between battery heat generation and tab heat generation, thereby improving the accuracy of heat generation measurement. Furthermore, simultaneously achieving tab cooling and heat generation testing provides multiple management strategies for battery thermal management, improving battery thermal management methods. Therefore, this invention provides a device that combines battery tab cooling and heat generation measurement. The device includes a tab cooling module and a heat generation measurement module. The battery under test is located in the heat generation measurement module, and its tabs are connected to the module. The tab cooling module includes a cooling component and an insulating cooling plate located within the heat generation measurement module. The insulating cooling plate is connected to the output end of the cooling component and is fixedly connected and in close contact with the tabs of the battery under test.

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present utility model.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0029] Example:

[0030] Figure 1One structure of the aforementioned device, which combines battery tab cooling and heat generation measurement, is shown. Specifically:

[0031] In this embodiment, an adiabatic accelerated calorimeter 101 is used as the calorimeter. The calorific value measurement module includes the adiabatic accelerated calorimeter 101, a charge / discharger 102, a first lead wire 103, and a second lead wire 104. The battery under test 100 is located inside the adiabatic accelerated calorimeter 101, and the charge / discharger 102 is located outside the adiabatic accelerated calorimeter 101. It has the first lead wire 103 and the second lead wire 104 and is connected to the tabs of the battery under test 100 through the first lead wire 103 and the second lead wire 104, respectively, so as to charge and discharge the battery under test 100. Optionally, the battery under test 100 can be a mass-produced battery, or it can be a battery that has been disassembled or has had a temperature sensor implanted through "surgery".

[0032] The adiabatic accelerated calorimeter 101 includes a measuring body 1011 and a top cover 1012. The top cover 1012 is placed on top of the measuring body 1011 and is equipped with a sensor 1013. The adiabatic accelerated calorimeter 101 also has a control host 105, which is communicatively connected to the adiabatic accelerated calorimeter 101.

[0033] The tab cooling module includes a cooling assembly and an insulating cooling plate 106 located in the adiabatic accelerated calorimeter 101. The insulating cooling plate 106 is fixedly connected to the two tabs of the battery under test 100 and is in close contact with the tabs. Optionally, the insulating cooling plate 106 is fixedly connected to the tabs of the battery under test 100 by insulating tape or insulating clips.

[0034] The cooling assembly includes a cooler 107, a first coolant pipe 108, and a second coolant pipe 109 connected in sequence. The first coolant pipe 108 and the second coolant pipe 109 are located outside and inside the adiabatic accelerating calorimeter 101, respectively. The output end of the second coolant pipe 109 is connected to an insulating cooling plate 106. A switch control element, namely a valve 110, is provided on the first coolant pipe 108. The cooler 107 uses an insulating coolant, and both the first coolant pipe 108 and the second coolant pipe 109 are provided with an external insulation layer, that is, the outer surface of the coolant pipes is wrapped with insulation material.

[0035] Figure 2 This is a partially enlarged view of the battery under test 100 inside the adiabatic accelerated calorimeter 101. In the figure, the ends of the first wire 103 and the second wire 104 are respectively connected to the two tabs of the battery under test 100. There are two insulating cooling plates 106, which are in close contact with the corresponding tabs. The end of each insulating cooling plate 106 is connected to the corresponding second coolant pipe 109, and then connected to the cooler 107 through the first coolant pipe 108.

[0036] When cooling the tabs, the cooler 107 pumps out coolant, which flows through the first coolant pipe 108, valve 110 and the second coolant pipe 109, and then through the insulating cooling plate 106. The insulating cooling plate 106 is fixed to the tabs of the battery under test 100 with insulating tape or insulating clips to ensure good contact between the insulating cooling plate 106 and the tabs. The cooler 107 is turned on to circulate the cooling and dissipate the heat from the tabs of the battery under test 100.

[0037] The aforementioned structural design effectively distinguishes between battery heat generation and tab heat generation, thereby improving the accuracy of heat generation measurement. Simultaneously achieving battery tab cooling and heat generation testing provides multiple management strategies for battery thermal management, thus improving battery thermal management methods. Specific implementation methods include:

[0038] (1) Simultaneously achieve battery tab cooling and heat generation testing

[0039] Based on the device provided in this embodiment, both battery tab cooling and adiabatic heating measurement can be achieved simultaneously. Specifically: the battery under test 100 is placed in an adiabatic accelerated calorimeter 101, which maintains an adiabatic environment. The cooling temperature is set by a cooling machine 107 to cool the battery tabs. The battery under test 100 is charged or discharged by a charge / discharge machine 102 according to predetermined steps. By monitoring the temperature change at the center of the battery surface, the adiabatic temperature rise under specific tab cooling conditions can be obtained. The adiabatic heating power of the battery can be obtained according to Q=Cm△T.

[0040] (2) Obtaining charge and discharge strategies that match the cooling temperatures of different electrodes

[0041] Based on the device provided in this embodiment, it is possible to test the battery tab cooling temperature and the matching charge and discharge strategy. Specifically, the battery under test 100 is placed in the adiabatic accelerated calorimeter 101, the adiabatic accelerated calorimeter 101 maintains an adiabatic environment, the cooling machine 107 sets different cooling temperatures to cool the battery tabs, the charge and discharge machine 102 charges or discharges the battery under test 100 according to different steps, and the temperature change of the center of the large surface of the battery is monitored. The charge and discharge adiabatic temperature rise at different tab cooling temperatures can be obtained. The adiabatic heating power of the battery is obtained according to Q=Cm△T, so as to obtain the charge and discharge strategy matching different tab cooling temperatures.

[0042] (3) A management strategy that balances tab cooling temperature, charge / discharge strategy, and internal battery temperature gradient.

[0043] Based on the device provided in this embodiment, it is possible to test the effect of tab cooling on the internal temperature gradient of battery charging and discharging heat generation under adiabatic conditions. Specifically, the battery under test 100 with an implanted temperature sensor is placed in an adiabatic accelerated calorimeter 101. The adiabatic accelerated calorimeter 101 maintains an adiabatic environment. Different cooling temperatures are set by the cooling machine 107 to cool the battery tabs. The battery is charged or discharged by the charging and discharging machine 102 according to preset steps. The temperature changes inside and outside the battery are monitored. The internal temperature gradient of the battery during charging and discharging at different tab cooling temperatures can be obtained. The tab cooling temperature and charging and discharging strategy are adjusted to obtain a management strategy that balances the tab cooling temperature, charging and discharging strategy and the internal temperature gradient of the battery.

[0044] (4) Obtain charging and discharging strategies that match different tab cooling temperatures and flow rates.

[0045] Based on the device provided in this embodiment, it is possible to test the battery tab cooling temperature, flow rate, and matching charge / discharge strategy. Specifically, the battery under test 100 is placed in an adiabatic accelerated calorimeter 101, and a thermally conductive calorimeter is placed between the insulating cooling plate 106 and the tab. The adiabatic accelerated calorimeter 101 maintains an adiabatic environment. Different cooling temperatures and flow rates are set by the cooling machine 107 to cool the battery tab. The thermally conductive calorimeter measures the heat removed from the tab by the insulating cooling plate. The charge / discharge machine 102 charges or discharges the battery according to different steps, and the temperature change at the center of the battery surface is monitored. The charge / discharge adiabatic temperature rise at different tab cooling temperatures can be obtained. The adiabatic heating power of the battery is obtained according to Q=Cm△T, so as to obtain a charge / discharge strategy matching different tab cooling temperatures and flow rates.

[0046] In some other embodiments, an isothermal calorimeter may be used, and the rest of the apparatus structure is the same as when using an adiabatic accelerated calorimeter. Based on this apparatus, tests can be performed to obtain the adiabatic temperature rise of the battery during charging and discharging under different tab cooling temperatures under isothermal conditions. Optionally, by using an isothermal calorimeter and superimposing tab cooling, the conditions of large-area cooling of the cell and tab cooling can be simulated to test the battery charging temperature rise and the internal temperature gradient of the battery.

[0047] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. An apparatus for both battery tab cooling and heat generation measurement, comprising: The application relates to a battery heat generation measuring device, which comprises a tab cooling module and a heat generation measuring module, wherein a battery to be measured is located in the heat generation measuring module and the tabs of the battery to be measured are connected with the heat generation measuring module, the tab cooling module comprises a cooling assembly and an insulating cooling plate located in the heat generation measuring module, the insulating cooling plate is connected with the output end of the cooling assembly, and is fixedly connected with and closely contacted with the tabs of the battery to be measured.

2. The apparatus for both tab cooling and heat generation measurement of a battery as claimed in claim 1, wherein, The insulating cooling plate is fixedly connected with the tabs of the battery to be measured through an insulating adhesive tape or an insulating clamp.

3. The apparatus for both tab cooling and heat generation measurement of a battery as claimed in claim 1, wherein, The cooling assembly comprises a cooling machine, a first cooling liquid pipeline and a second cooling liquid pipeline which are sequentially connected, the first cooling liquid pipeline and the second cooling liquid pipeline are respectively located outside and inside the heat generation measuring module, and the output end of the second cooling liquid pipeline is connected with the insulating cooling plate.

4. The apparatus of claim 3, wherein, A switch control element is arranged on the first cooling liquid pipeline.

5. The apparatus for both cooling of battery tabs and measurement of heat generation according to any one of claims 3-4, characterized in that, The first cooling liquid pipeline and the second cooling liquid pipeline are both provided with an external heat insulation layer.

6. The apparatus of claim 1, wherein, A heat-conducting calorimetric sheet is arranged between the insulating cooling plate and the tabs of the battery to be measured.

7. The apparatus of claim 1, wherein, The heat generation measuring module comprises a calorimeter, a charge-discharge machine, a first wire and a second wire, the battery to be measured is located inside the calorimeter, the charge-discharge machine is located outside the calorimeter, and the charge-discharge machine is connected with the tabs of the battery to be measured through the first wire and the second wire.

8. The apparatus of claim 7, wherein, The heat generation measuring module further comprises a control host computer which is in communication connection with the calorimeter.

9. The apparatus of claim 7, wherein, The calorimeter comprises a measuring main body and a top cover, and the top cover is arranged at the top end of the measuring main body and is provided with a sensor.

10. The apparatus for both cooling of battery tabs and measurement of heat generation according to any one of claims 7-9, characterized in that, The calorimeter is an adiabatic accelerating calorimeter or an isothermal calorimeter.

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