Battery pack temperature rise control method, apparatus and device, and readable storage medium

Abstract

A battery pack temperature rise control method, apparatus and device, and a readable storage medium, relating to the field of batteries. The method comprises: acquiring preset connector acting force limit value ranges corresponding to a target battery pack in different charging modes, each preset connector acting force limit value range being used for representing a correspondence relationship between a contact resistance limit value range of a connector interface and a temperature limit value range of a non-battery cell part in the battery pack in a corresponding charging mode; and, on the basis of the preset connector acting force limit value range in each charging mode, performing parameter control on a target connector interface of the target battery pack, such that a maximum contact resistance value of the target connector interface in each different charging mode is within the contact resistance limit value range corresponding to the preset connector acting force limit value range, thus achieving temperature rise control over the non-battery cell part in the battery pack. The present application can control temperature rise results of non-battery cell parts in battery packs to be within normal temperature limit value ranges in advance, so as to avoid abnormal temperature rise, thereby reducing the aging speed and safety risks of batteries.

Description

A method, apparatus, device, and readable storage medium for controlling the temperature rise of a battery pack. Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery pack temperature rise control method, apparatus, device, and readable storage medium. Background Technology

[0002] For charging stations, frequent fast charging requires monitoring the condition of vulnerable parts of the battery pack to prevent risks associated with aging. Frequent plugging and unplugging of the charging gun on the vehicle can increase contact resistance, leading to abnormal temperature rises in non-cell components such as connectors, copper busbars, and relays within the battery pack during charging and discharging. These abnormal temperature rises not only accelerate internal chemical reactions, thus speeding up battery aging and self-discharge, reducing battery capacity and shortening battery life, but also increase the safety risks of thermal runaway, overheating, and even fire and explosion.

[0003] However, related technologies often only use temperature sensors placed on the module surface to collect overall temperature changes of the battery pack, failing to monitor temperature rises in non-cell components inside the battery pack. Furthermore, increases in contact resistance are usually difficult to detect, making it impossible to effectively control abnormal temperature rises in a timely manner. Over time, abnormal temperature rises in non-cell components may pose safety risks. Therefore, how to effectively control abnormal temperature rises in non-cell components such as connectors, copper busbars, and relays within the battery pack is a pressing issue that needs to be addressed. Summary of the Invention

[0004] This application provides a battery pack temperature rise control method, device, equipment, and readable storage medium to effectively control abnormal temperature rises in non-cell components such as connectors, copper busbars, and relays within the battery pack. This can solve the technical problems in the prior art where abnormal temperature rises in non-cell components such as connectors, copper busbars, and relays lead to accelerated battery aging and increased safety risks.

[0005] In a first aspect, embodiments of this application provide a battery pack temperature rise control method, the battery pack temperature rise control method comprising:

[0006] Obtain the preset connector force limit range corresponding to the target battery pack under different charging modes. The preset connector force limit range is used to characterize the correspondence between the contact internal resistance limit range of the connector interface and the temperature limit range of the non-cell part in the battery pack under the corresponding charging mode.

[0007] Based on the preset connector force limit range under each charging mode, the target connector interface of the target battery pack is parameter controlled so that the maximum contact internal resistance of the target connector interface under different charging modes is within the contact internal resistance limit range corresponding to the preset connector force limit range, thereby achieving temperature rise control of the non-cell part of the battery pack. The parameters include the material coefficient and / or contact area of ​​the target connector interface.

[0008] In conjunction with the first aspect, in one embodiment, prior to the step of obtaining the preset connector force limit range corresponding to different charging modes of the target battery pack, the method further includes:

[0009] The charging gun is connected to the connector of the preset battery pack, and the preset battery pack is controlled to be in different charging modes. The preset battery pack and the target battery pack are battery packs of the same specification. The preset battery pack is equipped with a temperature sensor.

[0010] For each charging mode, the connectors of the preset battery pack are tested based on the corresponding set of test parameters, and the temperature of the non-cell parts is collected based on the temperature sensor. The set of test parameters includes multiple sets of forces with different directions and magnitudes.

[0011] A target MAP is constructed based on the temperature of the non-cell portion, the force exerted on the connectors of the preset battery pack, and the charging mode.

[0012] Based on the target MAP, the preset connector force limit range for the corresponding charging mode is determined.

[0013] In conjunction with the first aspect, in one implementation, testing the connectors of the preset battery pack based on a corresponding set of test parameters includes:

[0014] Applying forces of different directions and magnitudes to the connectors of the preset battery pack to adjust the contact resistance of the connector interface, the change in contact resistance of the connector interface is used to characterize the temperature change of the non-cell part of the preset battery pack.

[0015] In conjunction with the first aspect, in one embodiment, temperature sensors are respectively installed on the connectors, copper busbars, and relays within the preset battery pack.

[0016] Secondly, embodiments of this application provide a battery pack temperature rise control device, the battery pack temperature rise control device comprising:

[0017] The acquisition module is configured to acquire the preset connector force limit range corresponding to the target battery pack under different charging modes. The preset connector force limit range is used to characterize the correspondence between the contact internal resistance limit range of the connector interface and the temperature limit range of the non-cell part in the battery pack under the corresponding charging mode.

[0018] The control module is configured to perform parameter control on the target connector interface of the target battery pack based on the preset connector force limit range under each charging mode, so that the maximum contact internal resistance of the target connector interface under different charging modes is within the contact internal resistance limit range corresponding to the preset connector force limit range, thereby achieving temperature rise control of the non-cell part of the battery pack. The parameters include the material coefficient and / or contact area of ​​the target connector interface.

[0019] In conjunction with the second aspect, in one embodiment, the battery pack temperature rise control device further includes a testing module configured to:

[0020] The charging gun is connected to the connector of the preset battery pack, and the preset battery pack is controlled to be in different charging modes. The preset battery pack and the target battery pack are battery packs of the same specification. The preset battery pack is equipped with a temperature sensor.

[0021] For each charging mode, the connectors of the preset battery pack are tested based on the corresponding set of test parameters, and the temperature of the non-cell parts is collected based on the temperature sensor. The set of test parameters includes multiple sets of forces with different directions and magnitudes.

[0022] A target MAP is constructed based on the temperature of the non-cell portion, the force exerted on the connectors of the preset battery pack, and the charging mode.

[0023] Based on the target MAP, the preset connector force limit range for the corresponding charging mode is determined.

[0024] In conjunction with the second aspect, in one implementation, the test module is specifically configured as follows:

[0025] Applying forces of different directions and magnitudes to the connectors of the preset battery pack to adjust the contact resistance of the connector interface, the change in contact resistance of the connector interface is used to characterize the temperature change of the non-cell part of the preset battery pack.

[0026] In conjunction with the second aspect, in one embodiment, temperature sensors are respectively installed on the connectors, copper busbars, and relays within the preset battery pack.

[0027] Thirdly, embodiments of this application provide a battery pack temperature rise control device, which includes a processor, a memory, and a battery pack temperature rise control program stored in the memory and executable by the processor. When the battery pack temperature rise control program is executed by the processor, it implements the steps of the aforementioned battery pack temperature rise control method.

[0028] Fourthly, embodiments of this application provide a computer-readable storage medium storing a battery pack temperature rise control program, wherein when the battery pack temperature rise control program is executed by a processor, it implements the steps of the aforementioned battery pack temperature rise control method.

[0029] The beneficial effects of the technical solutions provided in this application include:

[0030] The relationship between the contact resistance limit of the connector interface and the temperature limit of the non-cell portion of the target battery pack is characterized by the preset connector force limit range under different charging modes. That is, as long as the force exerted on the connector under each charging mode is within its corresponding preset connector force limit range, the contact resistance after the connector interface changes will be within the normal contact resistance limit range, thus ensuring that the temperature of the non-cell portion of the battery pack also falls within the normal temperature limit range. Therefore, based on the preset connector force limit range under each charging mode, the material coefficient and / or contact area parameters of the target connector interface of the target battery pack are controlled to ensure that the real-time force exerted on the target connector falls within the preset connector force limit range when the charging gun frequently plugs and unplugs the target battery pack. This ensures that the maximum contact resistance of the target connector is within the corresponding contact resistance limit range, thereby ensuring that the temperature rise of the non-cell portion is within the normal temperature limit range. Therefore, this application achieves effective control of the temperature rise of the non-cell portion of the battery pack by controlling the temperature rise within the normal temperature limit range in advance, thereby avoiding abnormal temperature rise and effectively reducing battery aging speed and safety risks. Attached Figure Description

[0031] Figure 1 is a flowchart illustrating an embodiment of the battery pack temperature rise control method of this application;

[0032] Figure 2 is a schematic diagram of the functional modules of an embodiment of the battery pack temperature rise control device of this application;

[0033] Figure 3 is a schematic diagram of the hardware structure of the battery pack temperature rise control device involved in the embodiment of this application. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0036] In a first aspect, embodiments of this application provide a method for controlling the temperature rise of a battery pack.

[0037] In one embodiment, referring to FIG1, FIG1 is a schematic flowchart of an embodiment of the battery pack temperature rise control method of this application. As shown in FIG1, the battery pack temperature rise control method includes:

[0038] Step S10: Obtain the preset connector force limit range corresponding to the target battery pack under different charging modes. The preset connector force limit range is used to characterize the correspondence between the contact internal resistance limit range of the connector interface and the temperature limit range of the non-cell part in the battery pack under the corresponding charging mode.

[0039] As an example, in this embodiment, the charging modes include, but are not limited to, slow charging, fast charging, and high-current overcharging. It should be noted that the specific division of charging modes can be determined according to actual needs and is not limited here. It should be understood that, regardless of the charging mode, the greater the force exerted on the connectors within the battery pack, the greater the contact resistance of the connector interface, and consequently, the higher the temperature of the non-cell parts within the battery pack. In other words, there is a corresponding relationship between the force exerted on the connectors, the contact resistance of the connector interface, and the temperature of the non-cell parts; that is, a change in any one of them can characterize a change in the other two.

[0040] In this embodiment, the preset connector force limit range refers to the range of normal forces that the connector can withstand, the contact resistance limit range refers to the range of normal internal resistance that the connector interface can tolerate, and the temperature limit range refers to the range of normal temperatures that the non-cell parts of the battery pack can tolerate. It can be understood that as long as the force exerted on the connector is within this force limit range when the charging gun inserts or removes the battery pack, even if the insertion or removal causes an increase in the contact resistance of the connector interface, the increased contact resistance will still be within the normal contact resistance limit range. This ensures that the temperature rise caused by the change in contact resistance within the battery pack will also fall within the normal temperature limit range. In other words, it will not cause abnormal temperature rises in the non-cell parts of the battery pack.

[0041] For example, assuming a preset limit range of force for the connector is A, its corresponding limit range of contact resistance is B, and its temperature limit range is C, when the charging gun inserts or removes the battery pack, as long as the force applied to the connector is within the force limit range A, the increased contact resistance caused by the insertion or removal will be within the contact resistance limit range B. Therefore, the temperature rise within the battery pack due to the increased contact resistance will also fall within the temperature limit range C. Thus, this embodiment uses the preset limit range of force for the connector to characterize the correspondence between the contact resistance limit range of the connector interface and the temperature limit range of the non-cell portion within the battery pack.

[0042] Furthermore, for battery packs of different specifications, this embodiment will preset different connector force limit ranges for each specification of battery pack, and battery packs of the same specification will also have corresponding preset connector force limit ranges under different charging modes. For example, if there are battery packs X1 and X2 of different specifications, the preset connector force limit range for battery pack X1 under slow charging is A1, the preset connector force limit range for battery pack X1 under fast charging is A2, and the preset connector force limit range for battery pack X1 under supercharging is A3; similarly, the preset connector force limit range for battery pack X2 under slow charging is B1, the preset connector force limit range for battery pack X2 under fast charging is B2, and the preset connector force limit range for battery pack X3 under supercharging is B3.

[0043] Therefore, the preset connector force limit range in this embodiment can be used to characterize the correspondence between the contact internal resistance limit range of the connector interface and the temperature limit range of the non-cell part in the battery pack under the corresponding charging mode. Thus, the parameter control of the connector of the target battery pack can be limited by obtaining the preset connector force limit range corresponding to the target battery pack under different charging modes.

[0044] Step S20: Based on the preset connector force limit range under each charging mode, the target connector interface of the target battery pack is parameter controlled so that the maximum contact internal resistance of the target connector interface under different charging modes is within the contact internal resistance limit range corresponding to the preset connector force limit range, thereby achieving temperature rise control of the non-cell part of the battery pack. The parameters include the material coefficient and / or contact area of ​​the target connector interface.

[0045] In this exemplary embodiment, for the target battery pack, after obtaining the preset plug force limit range for each charging mode, the material coefficient and / or contact area of ​​the target plug interface of the target battery pack can be controlled based on the preset plug force limit range for each charging mode, on the basis of the conventional plug interface design. This achieves parameter control of the plug interface, that is, the preset plug force limit range for each charging mode is used as one of the elements of plug interface parameter control, so as to control the maximum contact internal resistance of the target plug interface in different charging modes to be within the contact internal resistance limit range corresponding to the preset plug force limit range, thereby achieving temperature rise control of the non-cell parts in the battery pack.

[0046] Specifically, the contact resistance, contact pressure, material coefficient, and contact form of the connector interface have the following relationships: ,in, Indicates contact resistance. This represents the material coefficient, which is related to the material of the electrical contact. This indicates the contact pressure (i.e., the preset limit range of the force applied by the connector). This represents a value corresponding to the contact type, indicating the size of the contact area. For example, when the contact type is point contact, =0.5, when the contact type is line contact, then 0.5 < <0.7, when the contact type is surface contact, then =1. Therefore, after determining the preset limit range of the force and the range of the contact resistance of the connector, the material coefficient of the target connector interface and the corresponding value of the contact area can be determined based on the above formula.

[0047] For example, assuming the preset connector force limit range for the target battery pack under slow charging is A1, and the contact resistance limit range corresponding to A1 is B1, and the temperature limit range is C1, then controlling the maximum contact resistance of the target connector interface in slow charging mode to be within B1, i.e., based on the formula... By determining the material coefficient and contact area of ​​the target connector interface using A1 and B1, and then designing and controlling the target connector interface based on the determined material coefficient and contact area, the temperature rise of the non-cell part of the target battery pack can be made to fall within C1, thereby avoiding safety risks in advance.

[0048] Therefore, this embodiment effectively controls the temperature rise of the non-cell parts of the battery pack by controlling the temperature rise within the normal temperature limit range in advance, thereby avoiding abnormal temperature rise and effectively reducing battery aging speed and safety risks.

[0049] Furthermore, in one embodiment, before the step of obtaining the preset connector force limit range corresponding to the target battery pack under different charging modes, the method further includes:

[0050] The charging gun is connected to the connector of the preset battery pack, and the preset battery pack is controlled to be in different charging modes. The preset battery pack and the target battery pack are battery packs of the same specification. The preset battery pack is equipped with a temperature sensor.

[0051] For each charging mode, the connectors of the preset battery pack are tested based on the corresponding set of test parameters, and the temperature of the non-cell parts is collected based on the temperature sensor. The set of test parameters includes multiple sets of forces with different directions and magnitudes.

[0052] A target MAP is constructed based on the temperature of the non-cell portion, the force exerted on the connectors of the preset battery pack, and the charging mode.

[0053] Based on the target MAP, the preset connector force limit range for the corresponding charging mode is determined.

[0054] In this embodiment, the testing of the connectors of the preset battery pack based on the corresponding set of test parameters includes: applying forces of different directions and magnitudes to the connectors of the preset battery pack to adjust the contact resistance of the connector interface. The change in contact resistance of the connector interface of the preset battery pack is used to characterize the temperature change of the non-cell portion of the preset battery pack.

[0055] As an example, it should be noted that the specifications of the preset battery pack in this embodiment are the same as those of the target battery pack. It should be understood that battery packs with the same specifications mean they have the same structure, physical characteristics, and chemical properties. Therefore, by testing the preset battery pack, the corresponding preset connector force limit range under different charging modes can be determined. Based on this preset connector force limit range, the parameters of the connector interface of the target battery pack with the same specifications as the preset battery pack can be controlled. This ensures that the maximum contact internal resistance of the target connector interface of the target battery pack under different charging modes is within the contact internal resistance limit range corresponding to the preset connector force limit range, thereby achieving temperature rise control of the non-cell parts within the battery pack.

[0056] In this embodiment, temperature sensors will be installed within the preset battery pack to measure the real-time temperature of the non-cell portion of the battery pack, and temperature changes will be collected and recorded by a temperature data acquisition device. It should be noted that the temperature sensor can be a temperature sensing wire or other temperature-measuring sensor; the specific type used can be determined according to actual needs and is not limited here.

[0057] The following describes the testing process for the preset battery pack: First, the charging gun is connected to the connector inside the preset battery pack, which has a temperature sensor already installed. The preset battery pack is then controlled to perform fast charging tests within a specified SOC (State of Charge) range under different charging modes. Since the contact resistance of the connector interface is related to the magnitude and direction of the force applied to the connector, when the preset battery pack is in different charging modes, forces are applied to the connector according to multiple sets of forces with different directions and magnitudes corresponding to the charging mode, thereby adjusting the contact resistance of the connector interface. Specifically, when applying forces of different directions (i.e., outward and inward) and magnitudes to the connector, it is preferable to control the direction of the force to be on a plane perpendicular to the insertion direction of the charging gun, and to apply the same magnitude of force every 90 degrees.

[0058] After all fast charging tests are completed, a target MAP map is constructed based on the temperature of the non-cell parts collected during the tests, the forces acting on the connectors of the preset battery pack, and the charging mode. That is, a MAP map is drawn showing how the temperature of each point in the non-cell parts changes with the forces acting on the connectors and the charging mode.

[0059] It should be understood that for each battery pack specification, the range of temperature changes that its non-cell parts can withstand under different charging modes is fixed. Therefore, the preset connector force limit range corresponding to the preset temperature limit range of the non-cell parts in the battery pack under different charging modes can be determined from the MAP diagram. That is, the minimum force and maximum force within the temperature limit range are selected as the lower limit and upper limit of the preset connector force limit range, respectively. It should be noted that the lower limit can also be 0, which is not limited here.

[0060] For example, suppose we need to determine the preset connector force limit range for a battery pack in slow charging mode. Then, based on the preset temperature limit range for the battery pack in slow charging mode, we determine the connector force limit range from the MAP diagram. This becomes the preset connector force limit range for slow charging mode, and the allowable contact resistance limit range for the connector interface is also determined. It should be understood that the specific value of the contact resistance limit range does not need to be actually calculated and determined. Once the preset connector force limit range is determined, in the corresponding charging mode, as long as the force on the connector is within this preset limit range, the change in contact resistance caused by insertion and removal is acceptable and safe, meaning it will not lead to abnormal temperature rise in non-cell parts. Therefore, it is not necessary to actually calculate the contact resistance limit range.

[0061] As can be seen, this embodiment simulates different application scenarios by applying forces of different directions and magnitudes to the connector, while simultaneously conducting charging simulation tests at different rates to monitor abnormal temperature rise in non-cell parts. Then, it reads the temperature changes under different conditions and determines the optimal range of connector force limits based on the actual test results. This determines the range of contact internal resistance limits, thereby enabling early control of abnormal temperature rise at the charging port connector and thus avoiding safety risks in advance.

[0062] Furthermore, in one embodiment, temperature sensors are respectively installed on the connectors, copper busbars, and relays within the preset battery pack.

[0063] Exemplary and understandable, for battery packs in normal use, temperature sensors are not placed on non-cell components such as copper busbars, making it impossible to monitor temperature rise changes in these non-cell components. Furthermore, non-cell components such as connectors, copper busbars, and relays within the battery pack that have formed circuits are prone to temperature changes, while components that have not formed circuits are generally less susceptible to temperature changes. Therefore, when monitoring the temperature rise of non-cell components within the battery pack, only the temperature changes of connectors, copper busbars, and relays that have formed circuits need to be monitored, while temperature change monitoring is unnecessary for non-cell components that have not formed circuits. Based on this, this embodiment preferably places temperature sensors on connectors, copper busbars, and relays within the preset battery pack used for testing that have formed circuits, to achieve temperature rise monitoring of non-cell components such as connectors, copper busbars, and relays.

[0064] Secondly, embodiments of this application also provide a battery pack temperature rise control device.

[0065] In one embodiment, referring to FIG2, FIG2 is a functional block diagram of an embodiment of the battery pack temperature rise control device of this application. As shown in FIG2, the battery pack temperature rise control device includes:

[0066] The acquisition module is configured to acquire the preset connector force limit range corresponding to the target battery pack under different charging modes. The preset connector force limit range is used to characterize the correspondence between the contact internal resistance limit range of the connector interface and the temperature limit range of the non-cell part in the battery pack under the corresponding charging mode.

[0067] The control module is configured to perform parameter control on the target connector interface of the target battery pack based on the preset connector force limit range under each charging mode, so that the maximum contact internal resistance of the target connector interface under different charging modes is within the contact internal resistance limit range corresponding to the preset connector force limit range, thereby achieving temperature rise control of the non-cell part of the battery pack. The parameters include the material coefficient and / or contact area of ​​the target connector interface.

[0068] Furthermore, in one embodiment, the battery pack temperature rise control device further includes a testing module, which is configured to:

[0069] The charging gun is connected to the connector of the preset battery pack, and the preset battery pack is controlled to be in different charging modes. The preset battery pack and the target battery pack are battery packs of the same specification. The preset battery pack is equipped with a temperature sensor.

[0070] For each charging mode, the connectors of the preset battery pack are tested based on the corresponding set of test parameters, and the temperature of the non-cell parts is collected based on the temperature sensor. The set of test parameters includes multiple sets of forces with different directions and magnitudes.

[0071] A target MAP is constructed based on the temperature of the non-cell portion, the force exerted on the connectors of the preset battery pack, and the charging mode.

[0072] Based on the target MAP, the preset connector force limit range for the corresponding charging mode is determined.

[0073] Furthermore, in one embodiment, the test module is specifically configured as follows:

[0074] Applying forces of different directions and magnitudes to the connectors of the preset battery pack to adjust the contact resistance of the connector interface, the change in contact resistance of the connector interface is used to characterize the temperature change of the non-cell part of the preset battery pack.

[0075] Furthermore, in one embodiment, temperature sensors are respectively installed on the connectors, copper busbars, and relays within the preset battery pack.

[0076] The functions of each module in the above-mentioned battery pack temperature rise control device correspond to the steps in the above-mentioned battery pack temperature rise control method embodiment, and their functions and implementation processes will not be described in detail here.

[0077] Thirdly, embodiments of this application provide a battery pack temperature rise control device, which can be a personal computer (PC), laptop computer, server, or other device with data processing capabilities.

[0078] Referring to Figure 3, which is a schematic diagram of the hardware structure of the battery pack temperature rise control device involved in the embodiment of this application, the battery pack temperature rise control device may include a processor, a memory, a communication interface, and a communication bus in this embodiment.

[0079] The communication bus can be of any type and is used to interconnect the processor, memory, and communication interface.

[0080] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces used for interconnecting components within the battery pack temperature rise control device, as well as interfaces used for interconnecting the battery pack temperature rise control device with other devices (such as other computing devices or user equipment). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user equipment can be displays, keyboards, etc.

[0081] Memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0082] The processor can be a general-purpose processor, which can call the battery pack temperature rise control program stored in the memory and execute the battery pack temperature rise control method provided in the embodiments of this application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed when the battery pack temperature rise control program is called can be referred to in various embodiments of the battery pack temperature rise control method of this application, and will not be described again here.

[0083] Those skilled in the art will understand that the hardware structure shown in FIG3 does not constitute a limitation of this application and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0084] Fourthly, embodiments of this application also provide a computer-readable storage medium.

[0085] The present application has a readable storage medium storing a battery pack temperature rise control program, wherein when the battery pack temperature rise control program is executed by a processor, it implements the steps of the battery pack temperature rise control method described above.

[0086] The method implemented when the battery pack temperature rise control program is executed can be referred to in various embodiments of the battery pack temperature rise control method of this application, and will not be repeated here.

[0087] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0088] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0089] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0090] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0091] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0092] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0093] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for controlling the temperature rise of a battery pack, characterized in that, The battery pack temperature rise control method includes: Obtain the preset connector force limit range corresponding to the target battery pack under different charging modes. The preset connector force limit range is used to characterize the correspondence between the contact internal resistance limit range of the connector interface and the temperature limit range of the non-cell part in the battery pack under the corresponding charging mode. Based on the preset connector force limit range under each charging mode, the target connector interface of the target battery pack is parameter controlled so that the maximum contact internal resistance of the target connector interface under different charging modes is within the contact internal resistance limit range corresponding to the preset connector force limit range, thereby achieving temperature rise control of the non-cell part of the battery pack. The parameters include the material coefficient and / or contact area of ​​the target connector interface.

2. The battery pack temperature rise control method as described in claim 1, characterized in that, Before the step of obtaining the preset connector force limit range corresponding to the target battery pack in different charging modes, the method further includes: The charging gun is connected to the connector of the preset battery pack, and the preset battery pack is controlled to be in different charging modes. The preset battery pack and the target battery pack are battery packs of the same specification. The preset battery pack is equipped with a temperature sensor. For each charging mode, the connectors of the preset battery pack are tested based on the corresponding set of test parameters, and the temperature of the non-cell parts is collected based on the temperature sensor. The set of test parameters includes multiple sets of forces with different directions and magnitudes. A target MAP is constructed based on the temperature of the non-cell portion, the force exerted on the connectors of the preset battery pack, and the charging mode. Based on the target MAP, the preset connector force limit range for the corresponding charging mode is determined.

3. The battery pack temperature rise control method as described in claim 2, characterized in that, The testing of the connectors of the preset battery pack based on the corresponding set of test parameters includes: Applying forces of different directions and magnitudes to the connectors of the preset battery pack to adjust the contact resistance of the connector interface, the change in contact resistance of the connector interface is used to characterize the temperature change of the non-cell part of the preset battery pack.

4. The battery pack temperature rise control method as described in claim 2, characterized in that: Temperature sensors are respectively installed on the connectors, copper busbars, and relays within the preset battery pack.

5. A battery pack temperature rise control device, characterized in that, The battery pack temperature rise control device includes: The acquisition module is configured to acquire the preset connector force limit range corresponding to the target battery pack under different charging modes. The preset connector force limit range is used to characterize the correspondence between the contact internal resistance limit range of the connector interface and the temperature limit range of the non-cell part in the battery pack under the corresponding charging mode. The control module is configured to perform parameter control on the target connector interface of the target battery pack based on the preset connector force limit range under each charging mode, so that the maximum contact internal resistance of the target connector interface under different charging modes is within the contact internal resistance limit range corresponding to the preset connector force limit range, thereby achieving temperature rise control of the non-cell part of the battery pack. The parameters include the material coefficient and / or contact area of ​​the target connector interface.

6. The battery pack temperature rise control device as described in claim 5, characterized in that, The battery pack temperature rise control device also includes a testing module, which is configured as follows: The charging gun is connected to the connector of the preset battery pack, and the preset battery pack is controlled to be in different charging modes. The preset battery pack and the target battery pack are battery packs of the same specification. The preset battery pack is equipped with a temperature sensor. For each charging mode, the connectors of the preset battery pack are tested based on the corresponding set of test parameters, and the temperature of the non-cell parts is collected based on the temperature sensor. The set of test parameters includes multiple sets of forces with different directions and magnitudes. A target MAP is constructed based on the temperature of the non-cell portion, the force exerted on the connectors of the preset battery pack, and the charging mode. Based on the target MAP, the preset connector force limit range for the corresponding charging mode is determined.

7. The battery pack temperature rise control device as described in claim 6, characterized in that, The test module is specifically configured as follows: Applying forces of different directions and magnitudes to the connectors of the preset battery pack to adjust the contact resistance of the connector interface, the change in contact resistance of the connector interface is used to characterize the temperature change of the non-cell part of the preset battery pack.

8. The battery pack temperature rise control device as described in claim 6, characterized in that: Temperature sensors are respectively installed on the connectors, copper busbars, and relays within the preset battery pack.

9. A battery pack temperature rise control device, characterized in that, The battery pack temperature rise control device includes a processor, a memory, and a battery pack temperature rise control program stored in the memory and executable by the processor, wherein when the battery pack temperature rise control program is executed by the processor, it implements the steps of the battery pack temperature rise control method as described in any one of claims 1 to 4.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a battery pack temperature rise control program, wherein when the battery pack temperature rise control program is executed by a processor, it implements the steps of the battery pack temperature rise control method as described in any one of claims 1 to 4.

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