Method and apparatus for correcting temperature of battery pack, and device, medium and battery pack

Abstract

Provided in the embodiments of the present disclosure are a method and apparatus for correcting the temperature of a battery pack, and a device, a medium and a battery pack. The method comprises: acquiring the temperature at a first temperature measurement point of a battery pack, wherein the first temperature measurement point is located on a casing of a corresponding battery cell in the battery pack; acquiring the temperature at a second temperature measurement point adjacent to the first temperature measurement point, wherein the second temperature measurement point is located on a terminal post of the corresponding battery cell and / or a bus device in the battery pack; and determining whether the current value in the battery pack is greater than or equal to 150 A, if the current value in the battery pack is greater than or equal to 150 A, correcting the temperature at the first temperature measurement point on the basis of the temperature at the second temperature measurement point, so as to obtain a corrected temperature at the first temperature measurement point, and if the current value in the battery pack is not greater than or equal to 150 A, using the temperature at the second temperature measurement point as a corrected temperature at the first temperature measurement point.

Description

Battery pack temperature correction method, apparatus, equipment, medium and battery pack

[0001] Cross-reference to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202410919190.0, filed on July 10, 2024, entitled “Temperature Correction Method, Apparatus, Device, Medium and Battery Pack for Battery Pack”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of battery technology, specifically to a method, apparatus, device, medium, and battery pack for temperature correction. Background Technology

[0004] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are being used more and more in the field of energy storage.

[0005] Temperature is a crucial control parameter for batteries during operation, directly affecting battery safety and charging / discharging strategies. Therefore, temperature sampling is extremely important for battery operation and safety.

[0006] In related technologies, temperature sensors, such as thermistors, are generally used for temperature sampling. The temperature sensors are set at the temperature measurement points inside the battery pack. The layout of the temperature measurement points and the method of processing the temperature measurement data will affect the accuracy of judging the working status of individual battery cells, and thus affect the charging and discharging performance and safety of the battery pack. Summary of the Invention

[0007] In view of this, the present disclosure aims to provide a method, apparatus, device, medium, and battery pack for temperature correction, in order to improve the accuracy of judging the working state of individual battery cells, thereby improving the charging and discharging performance and safety of the battery pack.

[0008] To achieve the above objectives, the technical solution of this disclosure embodiment is implemented as follows:

[0009] The first aspect of this disclosure provides a method for correcting the temperature of a battery pack. The method includes: acquiring the temperature of a first temperature measuring point in the battery pack, the first temperature measuring point being located on the outer casing of a corresponding battery cell within the battery pack; acquiring the temperature of a second temperature measuring point adjacent to the first temperature measuring point, the second temperature measuring point being located on the terminal post and / or busbar of the corresponding battery cell within the battery pack; determining whether the current value within the battery pack is greater than or equal to 150A; if so, correcting the temperature of the first temperature measuring point based on the temperature of the second temperature measuring point to obtain a corrected temperature of the first temperature measuring point; if not, using the temperature of the second temperature measuring point as the corrected temperature of the first temperature measuring point.

[0010] In this embodiment, the temperature of the first temperature measuring point is corrected by using the temperature of the second temperature measuring point. That is, the casing temperature of the battery cell is corrected based on the temperature of the adjacent charged part of the battery cell. This can compensate for the difference between the casing temperature and the temperature of the charged part to a certain extent. The corrected temperature will help to more accurately determine the working state of the battery cell, thereby improving the safety of the battery pack and its charging and discharging performance.

[0011] Furthermore, since the second temperature measuring point is located on a charged part, that is, at the location electrically connected to the electrode assembly of the battery cell, the temperature of the second temperature measuring point can more accurately reflect the actual working state of the battery cell when the current value is relatively small. Therefore, in this embodiment, when the current value is less than 150A, the temperature of the second temperature measuring point is directly used as the correction temperature of the first temperature measuring point, which can improve accuracy on the one hand and save calculation on the other.

[0012] In some embodiments, obtaining the temperature of a second temperature measuring point adjacent to the first temperature measuring point includes: determining the temperature measuring area where the first temperature measuring point is located; obtaining the temperature of the second temperature measuring point corresponding to the temperature measuring area, wherein the battery pack includes multiple temperature measuring areas, and each temperature measuring area corresponds to multiple first temperature measuring points and one second temperature measuring point.

[0013] In this embodiment, the battery pack is divided into multiple temperature measurement zones. This allows for the direct determination of an adjacent second temperature measurement point based on the temperature measurement zone where the first temperature measurement point is located, saving computational resources and improving efficiency. Furthermore, in this embodiment, each temperature measurement zone corresponds to one second temperature measurement point and multiple first temperature measurement points. That is, the total number of second temperature measurement points is less than the total number of first temperature measurement points, rather than being a one-to-one correspondence with the first temperature measurement points. This reduces the total number of temperature measurement devices deployed in the battery pack, thereby lowering the cost of the battery pack.

[0014] In some embodiments, the number of temperature measuring areas is at least three, and they are distributed along a first direction of the battery pack, which is the arrangement direction of the battery cells in a battery cell of the battery pack.

[0015] It is understandable that the heat exchange between the battery cells and charged parts near the two ends of the battery pack and the external structure is relatively large, while the heat exchange between the battery cells and charged parts near the middle of the battery pack and the external structure is relatively small, thus resulting in a temperature difference. In this embodiment, at least three temperature measuring areas are distributed along the arrangement direction of the battery cells in the battery pack, that is, the two end areas and the middle area are distinguished. In this way, the situation of using the temperature of the second temperature measuring point in the middle area to correct the temperature of the first temperature measuring point in the end area can be avoided as much as possible, thus improving the accuracy of the correction.

[0016] In some embodiments, the battery cells of the battery pack are distributed along a second direction, and the second temperature measuring points corresponding to each temperature measuring area are distributed along a third direction. The first direction, the second direction, and the third direction intersect each other and are all perpendicular to the height direction of the battery pack.

[0017] In this embodiment, based on the distribution of each temperature measurement area along the first direction, the second temperature measurement point corresponding to each temperature measurement area is distributed along a third direction, which intersects both the first and second directions. In this way, it is possible to further distinguish the two end areas and the middle area on the second direction (the distribution direction of the battery cells), thereby further improving the accuracy of the correction.

[0018] In some embodiments, correcting the temperature of the first temperature measuring point based on the temperature of the second temperature measuring point includes: using the higher value between the temperature of the first temperature measuring point and the temperature of the second temperature measuring point as the corrected temperature of the first temperature measuring point.

[0019] In this embodiment, the higher value between the temperature of the first temperature measuring point and the temperature of the second temperature measuring point is taken as the correction temperature. This improves the sensitivity of high temperature warning for individual battery cells, thereby enhancing the safety of the battery pack.

[0020] In some embodiments, correcting the temperature of the first temperature measuring point based on the temperature of the second temperature measuring point includes: correcting the temperature of the second temperature measuring point based on the ambient temperature inside the battery pack and / or the current value of the battery pack to obtain a corrected temperature of the second temperature measuring point; and using the higher value between the temperature of the first temperature measuring point and the corrected temperature of the second temperature measuring point as the corrected temperature of the first temperature measuring point.

[0021] In this embodiment, the temperature of the second temperature measuring point is first corrected based on the ambient temperature of the battery pack and / or the current value of the battery pack, and then the temperature of the first temperature measuring point is corrected based on the corrected temperature of the second temperature measuring point. That is, two corrections are performed, which can further improve the accuracy.

[0022] In some embodiments, correcting the temperature of the second temperature measuring point based on the ambient temperature and / or current value within the battery pack includes: determining a correction value based on the current value, wherein the correction value is positively correlated with the current value within at least a partial range; and subtracting the correction value from the temperature of the second temperature measuring point to obtain the corrected temperature of the second temperature measuring point.

[0023] In this embodiment, the temperature of the second temperature measuring point is corrected solely based on the current value, thus saving computational effort.

[0024] In some embodiments, correcting the temperature of the second temperature measuring point based on the ambient temperature and / or current value within the battery pack includes: selecting a correction strategy based on the ambient temperature, wherein if the ambient temperature is lower than a set temperature, a first correction strategy is selected, and if the ambient temperature is greater than or equal to the set temperature, a second correction strategy is selected; determining a correction value based on the current value and the selected correction strategy, wherein the correction value is positively correlated with the current value within at least a partial range, and the correction value corresponding to the first correction strategy is less than the correction value corresponding to the second correction strategy; and subtracting the correction value from the temperature of the second temperature measuring point to obtain the corrected temperature of the second temperature measuring point.

[0025] In this embodiment, the correction value is determined by taking into account both the current value and the ambient temperature, thereby further improving the accuracy.

[0026] In some embodiments, the correction value increases in a stepwise manner as the current value increases.

[0027] In this embodiment, the amount of computation can be reduced.

[0028] A second aspect of this disclosure provides a temperature correction device for a battery pack. The temperature correction device includes: a first acquisition module configured to acquire the temperature of a first temperature measuring point in the battery pack, the first temperature measuring point being located on the outer casing of a corresponding battery cell within the battery pack; a second acquisition module configured to acquire the temperature of a second temperature measuring point adjacent to the first temperature measuring point, the second temperature measuring point being located on the terminal post and / or busbar of the corresponding battery cell; and a correction module configured to determine whether the current value in the battery pack is greater than or equal to 150A. If so, the temperature of the first temperature measuring point is corrected based on the temperature of the second temperature measuring point to obtain a corrected temperature of the first temperature measuring point; otherwise, the temperature of the second temperature measuring point is used as the corrected temperature of the first temperature measuring point.

[0029] A third aspect of this disclosure provides a computer device including a memory and a processor. The memory stores a computer program executable on the processor. When the processor executes the computer program, it implements the steps of the battery pack temperature correction method of the first aspect of this disclosure.

[0030] A fourth aspect of this disclosure provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the battery pack temperature correction method of the first aspect of this disclosure.

[0031] A fifth aspect of this disclosure provides a battery pack, comprising: a housing; at least one battery cell located within the housing, the battery cell comprising at least two individual battery cells arranged in a first direction, each individual battery cell comprising a housing, an electrode assembly located within the housing, and a terminal post disposed on the housing, the terminal post being electrically connected to the electrode assembly; a busbar device for busing the electrical energy of the individual battery cells; a temperature measuring device comprising at least one first temperature measuring element and at least one second temperature measuring element, the first temperature measuring element being in contact with a first temperature measuring point, and the second temperature measuring element being in contact with a second temperature measuring point; and at least one of a temperature correction device for a battery pack according to a second aspect of this disclosure, a computer device according to a third aspect of this disclosure, and a computer-readable storage medium according to a fourth aspect of this disclosure.

[0032] The temperature correction device of the second aspect of the present disclosure, the computer device of the third aspect of the present disclosure, the computer-readable storage medium of the fourth aspect of the present disclosure, and the battery pack of the fifth aspect of the present disclosure have all the advantages of the temperature correction method of the battery pack of the first aspect of the present disclosure, and will not be repeated here. Attached Figure Description

[0033] Figure 1 is a schematic flowchart of a battery pack temperature correction method according to an embodiment of the present disclosure;

[0034] Figure 2 is a logic block diagram of a battery pack temperature correction method according to an embodiment of the present disclosure;

[0035] Figure 3 is a schematic diagram showing the distribution of the first and second temperature measuring points of the battery pack in an embodiment of this disclosure.

[0036] Figure 4 is a schematic diagram of the structure of the temperature correction device for the battery pack according to an embodiment of the present disclosure;

[0037] Figure 5 is a schematic diagram of the battery pack housing structure according to an embodiment of this disclosure;

[0038] Figure 6 is a structural schematic diagram of the housing and battery unit according to an embodiment of this disclosure;

[0039] Figure 7 is a schematic diagram of the structure of a single battery cell according to an embodiment of this disclosure;

[0040] Figure 8 is a schematic diagram of the top side structure of the bus device, flexible circuit board and temperature measuring device according to an embodiment of the present disclosure;

[0041] Figure 9 is a schematic diagram of the bottom structure of the bus device, flexible circuit board and temperature measuring device according to an embodiment of this disclosure;

[0042] Figure 10 is a schematic diagram of the structure of the bus device according to an embodiment of this disclosure;

[0043] Figure 11 is an enlarged schematic diagram of part A in Figure 8;

[0044] Figure 12 is a schematic diagram of the structure of the bracket according to an embodiment of the present disclosure.

[0045] Explanation of reference numerals in the attached figures

[0046] 1. Housing; 2. Battery unit; 21. Battery cell; 211. Outer shell; 2111. Metal shell; 2111a. Main shell; 2111b. End cap; 2112. Insulating film; 2112a. Clearance opening; 212. Terminal post; 2121. Positive terminal post; 2122. Negative terminal post; 213. Explosion-proof valve; 3. Busbar device; 31. Busbar body; 31a. Clearance notch; 32. Voltage sampler; 4. Temperature measuring device; 41. First temperature measuring element; 42. Second temperature measuring element; 5. Circuit board; 51. Connector; 6. Jumper device; 7. Bracket; 7a. Cutout part. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the terms “comprising” and “having” and any variations thereof in this disclosure are intended to cover non-exclusive inclusion.

[0049] In the description of the embodiments of this disclosure, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0050] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0051] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, D and / or F can represent: D existing alone, D and F existing simultaneously, and F existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following associated objects are in an "or" relationship.

[0052] In the description of the embodiments of this disclosure, the technical terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated, or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this disclosure.

[0053] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0054] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0055] In the description of this disclosure, the orientations or positional relationships such as "first direction," "second direction," "third direction," and "altitude direction" are based on the orientations or positional relationships shown in the accompanying drawings. Specifically, "first direction" refers to the direction indicated by arrow L1 in the drawings, "second direction" refers to the direction indicated by arrow L2 in the drawings, and "third direction" refers to the direction indicated by arrow L3 in the drawings. It should be understood that these orientational terms are for the convenience of describing this disclosure and for 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, and therefore should not be construed as limiting this disclosure.

[0056] With the government's strong promotion of new energy vehicles, these vehicles have ushered in a golden opportunity for development. Vehicle safety and stability have always been top concerns. Therefore, improving the safety of new energy vehicles will be one of the key factors determining their rapid popularization. As the main component of the battery pack in new energy vehicles, improving the safety of the battery cell is a crucial way to enhance the overall safety of the vehicle.

[0057] A battery cell typically includes multiple individual cells, which are enclosed within a frame welded together from end plates and side plates. During the assembly of the battery cell, the end plates at both ends exert a certain preload on the battery to improve and enhance its cycle performance.

[0058] The battery cell includes a casing, an electrode assembly disposed within the casing, and terminals disposed within the casing, with the terminals electrically connected to the electrode assembly. The electrode assembly consists of a positive electrode plate, a negative electrode plate, and a separator, and the terminals include a positive terminal and a negative terminal, which are electrically connected to the positive electrode plate and the negative electrode plate, respectively.

[0059] A single battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates. The positive electrode plate consists of a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, while the uncoated current collector protrudes beyond the coated one. These uncoated current collectors, stacked together, form the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode plate consists of a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, while the uncoated current collector protrudes beyond the coated one. These uncoated current collectors, stacked together, form the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, etc. The separator can be made of PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly can be a wound structure or a stacked structure.

[0060] The battery pack also includes an integrated busbar (Cells Contact System, CCS), which is mainly composed of a flexible printed circuit (FPC), busbars (such as copper-aluminum busbars), voltage samplers, and temperature measuring devices. The busbars, voltage samplers, and temperature measuring devices are all connected to the flexible printed circuit board.

[0061] The busbar is electrically connected to the terminals of two adjacent battery cells, thereby connecting the two adjacent battery cells in series or in parallel.

[0062] Voltage samplers typically include a nickel plate that contacts the terminals of a bus device and / or a battery cell and is electrically connected to a flexible circuit board to achieve voltage acquisition.

[0063] Temperature sensing devices include temperature sensors, such as thermistors (Negative Temperature Coefficient thermistors), which are located at the temperature sensing points within the battery pack.

[0064] In related technologies, temperature measuring devices typically contact the casing of a battery cell to measure temperature; that is, the temperature measuring point is usually located on the casing of the battery cell. However, this disclosure has found that there is a certain difference between the casing temperature of the battery cell and the temperature of the charged parts inside the battery pack. The charged parts mainly include the electrode assembly, terminals, and busbars electrically connected to the terminals of the battery cell.

[0065] The aforementioned temperature differences are particularly pronounced when the battery pack has a high charge / discharge rate. The charge / discharge rate is the ratio between the energy value and the power value of the battery pack. A higher charge / discharge rate means that the current during the operation of the battery pack may be higher (e.g., it may be greater than 150A, or greater than 300A, or greater than 400A, or even greater than 500A). The current thermal effect will increase with the increase of the current value, which in turn leads to an increase in the temperature difference between the casing of the battery cell and the charged parts.

[0066] Therefore, when the charge / discharge rate of the battery pack is relatively high, or more specifically, when the ratio of the energy value to the power value of the battery pack is less than or equal to 1 / 3, it is difficult to accurately judge the working state of the individual battery cells by relying on the temperature of the battery cell casing, which may affect the safety of the battery pack and its charge / discharge performance.

[0067] To address this issue, a temperature correction method for a battery pack according to an embodiment of this disclosure is proposed. The method includes: acquiring the temperature of a first temperature measuring point within the battery pack, the first temperature measuring point being located on the outer casing of a corresponding battery cell within the battery pack; acquiring the temperature of a second temperature measuring point adjacent to the first temperature measuring point, the second temperature measuring point being located on a terminal of the corresponding battery cell or a busbar electrically connected to the terminal; and correcting the temperature of the first temperature measuring point based on the temperature of the second temperature measuring point to obtain a corrected temperature for the first temperature measuring point.

[0068] In this embodiment, the temperature of the first temperature measuring point is corrected by using the temperature of the second temperature measuring point. That is, the casing temperature of the battery cell is corrected based on the temperature of the adjacent charged part of the battery cell. This can compensate for the difference between the casing temperature and the temperature of the charged part to a certain extent. The corrected temperature will help to more accurately determine the working state of the battery cell, thereby improving the safety of the battery pack and its charging and discharging performance.

[0069] According to some embodiments of this disclosure, referring to FIG1, the temperature correction method includes the following steps.

[0070] Step S101: Obtain the temperature of a first temperature measuring point in the battery pack. The first temperature measuring point is located on the outer shell of the corresponding battery cell inside the battery pack.

[0071] Step S102: Obtain the temperature of a second temperature measuring point adjacent to the first temperature measuring point. The second temperature measuring point is located at least one of the terminals of the corresponding battery cell or the current collector connected to the terminal.

[0072] Step S103: Determine whether the current value in the battery pack is greater than or equal to 150A. If yes, correct the temperature of the first temperature measuring point according to the temperature of the second temperature measuring point to obtain the corrected temperature of the first temperature measuring point. If no, use the temperature of the second temperature measuring point as the corrected temperature of the first temperature measuring point.

[0073] It is understood that a battery pack typically contains multiple battery cells, and therefore can have multiple first temperature measuring points. For each of these first temperature measuring points, the temperature correction method provided in this embodiment can be used for correction.

[0074] In step S101, the temperature of the first temperature measuring point can be obtained by communicating with a temperature measuring device that is in contact with the first temperature measuring point (i.e., a temperature measuring device that is in contact with the outer casing of the corresponding battery cell).

[0075] Similar to the first temperature measuring point, the battery pack can have multiple second temperature measuring points. The number of second temperature measuring points can be the same as, more than, or less than the number of first temperature measuring points; there is no restriction on this.

[0076] In step S102, it is necessary to obtain the temperature of a second temperature measuring point adjacent to the first temperature measuring point in step S101. Here, "adjacent" refers to spatial proximity. Specifically, the second temperature measuring point adjacent to the first temperature measuring point is the second temperature measuring point whose straight-line distance from the first temperature measuring point is relatively small in the spatial coordinate system within the battery pack.

[0077] It is understandable that there may be some temperature differences between the second temperature measuring points at different locations within the battery pack. For example, the second temperature measuring point near the end area of ​​the battery pack may exchange more heat with the external environment, while the second temperature measuring point near the middle area may exchange less heat with the external environment, thus resulting in a temperature difference between the two. Therefore, in this embodiment, the temperature of a second temperature measuring point adjacent to the first temperature measuring point is selected to further improve accuracy.

[0078] In step S103, if the current value in the battery pack is greater than or equal to 150A, the temperature of the first temperature measuring point obtained in step S101 is corrected based on the temperature of the second temperature measuring point obtained in step S102, thereby obtaining the corrected temperature of the first temperature measuring point. The purpose of the correction is to compensate for the difference between the two temperatures, so that the obtained corrected temperature can more accurately reflect the actual working state of the battery cell corresponding to the first temperature measuring point.

[0079] If the current value in the battery pack is less than 150A, then the temperature of the second temperature measuring point is used as the correction temperature of the first temperature measuring point.

[0080] It is understandable that since the second temperature measuring point is located on a live part, that is, at the location electrically connected to the electrode assembly of the battery cell, the temperature of the second temperature measuring point can more accurately reflect the actual working state of the battery cell when the current value is relatively small. Therefore, in this embodiment, when the current value is less than 150A, the temperature of the second temperature measuring point is directly used as the correction temperature of the first temperature measuring point, which can improve accuracy on the one hand and save calculations on the other.

[0081] It should be noted that the current value of the battery pack here refers to the input current value and / or output current value of the battery pack, not the current value of a single battery cell.

[0082] As an example, the correction method may include, but is not limited to, taking the higher value, average value, or weighted average of the two temperatures, or calculating the two temperatures according to a specific calculation method. Those skilled in the art can choose the correction method according to actual usage needs.

[0083] In some embodiments, step S102, "obtaining the temperature of a second temperature measuring point adjacent to the first temperature measuring point," may specifically include: determining the temperature measuring area where the first temperature measuring point is located, and obtaining the temperature of the second temperature measuring point corresponding to the temperature measuring area. The battery pack includes multiple temperature measuring areas, each temperature measuring area corresponding to multiple first temperature measuring points and one second temperature measuring point.

[0084] In this embodiment, the battery pack is divided into multiple temperature measurement zones. This allows for the direct determination of an adjacent second temperature measurement point based on the temperature measurement zone where the first temperature measurement point is located, saving computational resources and improving efficiency. Furthermore, in this embodiment, each temperature measurement zone corresponds to one second temperature measurement point and multiple first temperature measurement points. That is, the total number of second temperature measurement points is less than the total number of first temperature measurement points, rather than being a one-to-one correspondence with the first temperature measurement points. This reduces the total number of temperature measurement devices deployed in the battery pack, thereby reducing the cost of the battery pack. Further, it is understood that the temperature difference between the outer casings of individual battery cells at different locations within the battery pack is usually more significant than the temperature difference between the charged parts at different locations. Therefore, this embodiment chooses to reduce the number of second temperature measurement points rather than the number of first temperature measurement points.

[0085] In some embodiments, multiple temperature measurement areas are distributed along a first direction of the battery pack, where the first direction is the arrangement direction of the individual battery cells in a battery cell of the battery pack.

[0086] It is understandable that the heat exchange between the battery cells and charged parts near the two ends of the battery pack and the external structure is relatively large, while the heat exchange between the battery cells and charged parts near the middle of the battery pack and the external structure is relatively small, thus resulting in a temperature difference. In this embodiment, at least three temperature measuring areas are distributed along the arrangement direction of the battery cells in the battery pack, that is, the two end areas and the middle area are distinguished. In this way, the situation of using the temperature of the second temperature measuring point in the middle area to correct the temperature of the first temperature measuring point in the end area can be avoided as much as possible, thus improving the accuracy of the correction.

[0087] In some embodiments, the battery cells of the battery pack are distributed along a second direction, and the second temperature measuring points corresponding to each temperature measuring area are distributed along a third direction. The first direction, the second direction, and the third direction intersect each other and are all perpendicular to the height direction of the battery pack.

[0088] In this embodiment, based on the distribution of each temperature measurement area along the first direction, the second temperature measurement point corresponding to each temperature measurement area is distributed along a third direction, which intersects both the first and second directions. In this way, it is possible to further distinguish the two end areas and the middle area on the second direction (the distribution direction of the battery cells), thereby further improving the accuracy of the correction.

[0089] As an example, the first direction can be the length direction of the battery pack, the second direction can be the width direction of the battery pack, and the third direction can be the diagonal direction of the battery pack or a direction close to the diagonal direction, such as a direction whose angle with the diagonal of the battery pack does not exceed 5°, 10°, or 15°.

[0090] The following will provide several specific methods for correcting the temperature of the first temperature measuring point based on the temperature of the second temperature measuring point.

[0091] In some embodiments, step S103, “correcting the temperature of the first temperature measuring point based on the temperature of the second temperature measuring point”, specifically includes: using the higher value between the temperature of the first temperature measuring point and the temperature of the second temperature measuring point as the corrected temperature of the first temperature measuring point.

[0092] In this embodiment, the higher value between the temperature of the first temperature measuring point and the temperature of the second temperature measuring point is taken as the correction temperature. This improves the sensitivity of high temperature warning for individual battery cells, thereby enhancing the safety of the battery pack.

[0093] In some other embodiments, step S103, "correcting the temperature of the first temperature measuring point based on the temperature of the second temperature measuring point", includes: correcting the temperature of the second temperature measuring point based on the ambient temperature inside the battery pack and / or the current value of the battery pack to obtain the corrected temperature of the second temperature measuring point; and using the higher value between the temperature of the first temperature measuring point and the corrected temperature of the second temperature measuring point as the corrected temperature of the first temperature measuring point.

[0094] In this embodiment, the temperature of the second temperature measuring point is first corrected based on the ambient temperature of the battery pack and / or the current value of the battery pack, and then the temperature of the first temperature measuring point is corrected based on the corrected temperature of the second temperature measuring point. That is, two corrections are performed, which can further improve the accuracy.

[0095] The difference between the ambient temperature inside the battery pack and the temperatures at the first and second temperature measuring points is that the temperatures at the first and second temperature measuring points are related to specific individual battery cells, while the ambient temperature inside the battery pack is related to the overall environment of each individual battery cell within the battery pack. For example, the ambient temperature inside the battery pack can be the temperature detected by a temperature sensor located on the control board of the battery pack or at another location relatively far from the individual battery cells within the battery pack.

[0096] It is understandable that, given the same actual heat generation of a single battery cell, the measured temperature of the battery cell will be different under different ambient temperatures. Using ambient temperature for correction helps to make the corrected temperature of the first temperature measurement point more accurately reflect the actual heat generation of the battery cell.

[0097] The current value of the battery pack refers to the input current value and / or output current value of the battery pack. It can be understood that the current value is directly related to the heat generated by the current thermal effect. This part of the heat usually does not completely act on the battery cells. Using the current value for correction helps to make the corrected temperature of the first temperature measurement point more accurately reflect the actual impact of the current thermal effect on the battery cells.

[0098] It is understood that the temperature of the second temperature measuring point is relatively greatly affected by the ambient temperature and / or current value. Therefore, in this embodiment, the correction based on the ambient temperature and / or current value is applied to the temperature of the second temperature measuring point to improve accuracy. Specifically, the correction based on the ambient temperature and / or current value can be performed by determining a correction value based on the ambient temperature and / or current value, and then subtracting this correction value during the correction process. This method may result in a lower corrected temperature. Therefore, in this embodiment, the corrected temperature of the second temperature measuring point is further compared with the temperature of the first temperature measuring point, and the higher value is taken as the corrected temperature of the first temperature measuring point, thereby reducing the risk of the corrected temperature of the first temperature measuring point being too low.

[0099] In this embodiment, correction can be made based on the current value alone, or based on the ambient temperature alone, or based on both the current value and the ambient temperature. The following will provide two specific methods for correcting the temperature of the second temperature measuring point.

[0100] In some embodiments, “correcting the temperature of the second temperature measuring point based on the ambient temperature and / or current value within the battery pack” specifically includes: determining a correction value based on the current value, wherein the correction value is positively correlated with the current value within at least a partial range; and subtracting the correction value from the temperature of the second temperature measuring point to obtain the corrected temperature of the second temperature measuring point.

[0101] In this embodiment, the temperature of the second temperature measuring point is corrected solely based on the current value, thus saving computational effort.

[0102] In this embodiment, the specific correlation between the current value and the correction value can be determined by those skilled in the art based on experiments, calculations, historical experience, etc., and there are no limitations on this. As an example, the correction value can increase in a stepwise manner as the current value increases, thus saving computational effort. For instance, the correction value is 1 when the current value is greater than or equal to 150A and less than 300A; 2 when the current value is greater than or equal to 300A and less than 400A; 4 when the current value is greater than or equal to 400A and less than 500A; and 6 when the current value is greater than or equal to 500A. The unit of these correction values ​​is degrees Celsius. Of course, the correction value can also have other forms of positive correlation with the current value.

[0103] In other embodiments, "correcting the temperature of the second temperature measuring point based on the ambient temperature and / or current value within the battery pack" specifically includes: selecting a correction strategy based on the ambient temperature, wherein if the ambient temperature is lower than a set temperature, a first correction strategy is selected, and if the ambient temperature is greater than or equal to the set temperature, a second correction strategy is selected; determining a correction value based on the current value and the selected correction strategy, wherein the correction value corresponding to the first correction strategy is less than the correction value corresponding to the second correction strategy; and subtracting the correction value from the temperature of the second temperature measuring point to obtain the corrected temperature of the second temperature measuring point.

[0104] In this embodiment, the correction value is determined by taking into account both the current value and the ambient temperature, thereby further improving the accuracy.

[0105] It should be noted that "the correction value corresponding to the first correction strategy is less than the correction value corresponding to the second correction strategy" specifically means that for the same current value, the correction value when using the first correction strategy is less than the correction value when using the second correction strategy.

[0106] The set temperature can be determined by those skilled in the art based on the actual operating environment of the battery pack. As an example, the set temperature can be 0°C.

[0107] The specific relationship between the current value and the correction value can be determined by those skilled in the art based on experiments, calculations, historical experience, etc., and there are no restrictions on this. As an example, the correction value can increase in a stepwise manner as the current value increases. For instance, when the current value is greater than or equal to 150A and less than 300A, the correction value corresponding to the first correction strategy is 1, and the correction value corresponding to the second correction strategy is 2; when the current value is greater than or equal to 300A and less than 400A, the correction value corresponding to the first correction strategy is 2, and the correction value corresponding to the second correction strategy is 4; when the current value is greater than or equal to 400A and less than 500A, the correction value corresponding to the first correction strategy is 4, and the correction value corresponding to the second correction strategy is 6; when the current value is greater than or equal to 500A, the correction value corresponding to the first correction strategy is 6, and the correction value corresponding to the second correction strategy is 8. The unit of the above correction values ​​is degrees Celsius.

[0108] In some embodiments, the correction values ​​in the above embodiments increase in a stepwise manner with the increase of the current value. This reduces the amount of computation.

[0109] The temperature correction method for the battery pack in one or more of the above embodiments will be described in more detail below with reference to a specific embodiment.

[0110] The ambient temperature T, current value I, temperature Td1 of a first temperature measuring point, and temperature Tb1 of a second temperature measuring point adjacent to the first temperature measuring point are obtained within the battery pack.

[0111] Referring to Figure 2, which shows a logic block diagram 200 of an embodiment of the present disclosure, regardless of whether the ambient temperature T is between -20℃ and 0℃ (excluding the endpoints) or greater than or equal to 0℃, when the current value I is less than 150A, the temperature Tb1 of the second temperature measuring point is used as the corrected temperature Tbx1 of the first temperature measuring point, that is, Tbx1 = Tb1.

[0112] When the current value I is greater than or equal to 150A, the correction value is determined based on the current value I and the ambient temperature T. The correction value is subtracted from the temperature Tb1 of the second temperature measuring point to obtain the correction temperature of the second temperature measuring point. Then, the higher value between the correction temperature of the first temperature measuring point Td1 and the correction temperature of the second temperature measuring point is taken as the correction temperature Tbx1 of the first temperature measuring point, that is, Tbx1=MAX{Td1,Tb1-correction value}.

[0113] The correction value is determined jointly based on the ambient temperature and the current value. First, a correction strategy is selected based on the ambient temperature, and then the correction value is determined based on the current value and the selected correction strategy. When the ambient temperature I is between -20℃ and 0℃ (excluding the endpoints), the first correction strategy is selected; when the ambient temperature I is greater than or equal to 0℃, the second correction strategy is selected; when the ambient temperature I is less than or equal to -20℃, it may be necessary to stop the operation of the battery pack.

[0114] Specifically, if the ambient temperature I is between -20℃ and 0℃, the first correction strategy is selected. In this case, if 150A ≤ I < 300A, the correction value is 1, and Tbx1 = MAX{Td1, Tb1-1}. If 300A ≤ I < 400A, the correction value is 2, and Tbx1 = MAX{Td1, Tb1-2}. If 400A ≤ I < 500A, the correction value is 4, and Tbx1 = MAX{Td1, Tb1-4}. If I ≥ 500A, the correction value is 6, and Tbx1 = MAX{Td1, Tb1-6}.

[0115] If the ambient temperature I is greater than or equal to 0℃, the second correction strategy is selected. In this case, if 150A ≤ I < 300A, the correction value is 2, and Tbx1 = MAX{Td1, Tb1-2}. If 300A ≤ I < 400A, the correction value is 4, and Tbx1 = MAX{Td1, Tb1-4}. If 400A ≤ I < 500A, the correction value is 6, and Tbx1 = MAX{Td1, Tb1-6}. If I ≥ 500A, the correction value is 8, and Tbx1 = MAX{Td1, Tb1-8}.

[0116] The units for all the above correction values ​​are in degrees Celsius.

[0117] Furthermore, the battery pack is equipped with multiple first temperature measuring points and multiple second temperature measuring points. Referring to Figure 3, NTC2, NTC3, NTC4, NTC5, NTC6, NTC7, NTC9, NTC11, NTC12, NTC13, and NTC14 are first temperature measuring points, and NTC1, NTC8, and NTC10 are second temperature measuring points.

[0118] The temperature at each of the first temperature measurement points can be corrected using the above method.

[0119] As shown in Figure 3, the three second temperature measuring points are located at the two end regions and the middle region of the battery pack along the first direction. That is, in this embodiment, there are three temperature measuring regions distributed along the first direction of the battery pack. This first direction is the arrangement direction of the individual battery cells in a battery unit of the battery pack, more specifically, the length direction of the battery pack. When correcting the aforementioned first temperature measuring point, the temperature of the second temperature measuring point corresponding to its temperature measuring region is selected for correction. Further, the battery pack includes two battery cells distributed along the second direction, and the three second temperature measuring points are distributed along a third direction, with the first direction, second direction, and third direction intersecting each other. More specifically, the second direction is the width direction of the battery pack, and the third direction is close to the diagonal direction of the battery pack.

[0120] Embodiments of this disclosure also provide a battery pack temperature correction device. Referring to FIG4, the temperature correction device 400 includes a first acquisition module 410, a second acquisition module 420, and a correction module 430. The first acquisition module 410 is configured to acquire the temperature of a first temperature measuring point in the battery pack, the first temperature measuring point being located on the outer casing of the corresponding battery cell within the battery pack. The second acquisition module 420 is configured to acquire the temperature of a second temperature measuring point adjacent to the first temperature measuring point, the second temperature measuring point being located on the terminal post and / or busbar of the corresponding battery cell. The correction module 430 is configured to determine whether the current value in the battery pack is greater than or equal to 150A. If so, the temperature of the first temperature measuring point is corrected according to the temperature of the second temperature measuring point to obtain the corrected temperature of the first temperature measuring point; otherwise, the temperature of the second temperature measuring point is used as the corrected temperature of the first temperature measuring point.

[0121] It should be noted that the information interaction and execution process between the above modules are based on the same concept as the method embodiments of this disclosure, and are devices corresponding to the temperature correction method of the above battery pack. All implementation methods in the above method embodiments are applicable to the embodiments of this device. For details on its specific functions and the technical effects it brings, please refer to the method embodiment section, which will not be repeated here.

[0122] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is used as an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0123] The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this disclosure. The specific working processes of the units and modules in the above system can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0124] Embodiments of this disclosure also provide a computer device, including a memory and a processor, the memory storing a computer program executable on the processor, the processor executing the computer program to implement the steps in the battery pack temperature correction method of any of the above embodiments.

[0125] The hardware components of this computer device include a processor, a communication interface, and memory. The processor typically controls the overall operation of the computer device. The communication interface enables the computer device to communicate with other terminals or servers via a network. The memory is configured to store instructions and applications executable by the processor, and can also cache data to be processed or already processed by the processor and various modules within the computer device (e.g., image data, audio data, voice communication data, and video communication data). This can be implemented using flash memory or random access memory (RAM). Data transfer between the processor, communication interface, and memory can be achieved via a bus.

[0126] The computer-readable storage medium may be transient or non-transient.

[0127] Embodiments of this disclosure also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps in the battery pack temperature correction method of any of the above embodiments.

[0128] Embodiments of this disclosure also provide a computer program product, which includes a computer program or instructions that are executed by a processor to implement the steps in the battery pack temperature correction method of any of the above embodiments.

[0129] The computer program product can be implemented in hardware, software, or a combination thereof. In some embodiments, the computer program product is specifically embodied in a computer storage medium; in other embodiments, the computer program product is specifically embodied in a software product, such as a software development kit (SDK), etc.

[0130] This disclosure also provides a battery pack. Referring to Figures 5-9, the battery pack includes: a housing 1, at least one battery cell 2, a busbar device 3, a temperature measuring device 4, and at least one of the temperature correction device, computer equipment, and computer-readable storage medium as described in any of the above embodiments.

[0131] At least one battery cell 2 is located inside the housing 1. The battery cell 2 includes at least two individual battery cells 21, arranged in a first direction. Each battery cell 21 includes a housing 211, an electrode assembly located within the housing 211, and a terminal post 212 disposed on the housing 211. The terminal post 212 is electrically connected to the electrode assembly. A current collector 3 is used to combine the electrical energy of the battery cell 21. A temperature measuring device 4 includes at least one first temperature measuring element 41 and at least one second temperature measuring element 42. The first temperature measuring element 41 is in contact with a first temperature measuring point, and the second temperature measuring element 42 is in contact with a second temperature measuring point. The first temperature measuring point is located on the housing of the corresponding battery cell 21, and the second temperature measuring point is located on the terminal post 212 of the corresponding battery cell 21 and / or the corresponding current collector 3.

[0132] The specific structure of the housing 1 is not limited. As an example, referring to Figure 5, the housing 1 of the battery pack can be roughly rectangular.

[0133] At least one battery cell 21 is disposed inside the housing 1. Referring to FIG6, each battery cell 2 includes at least two battery cells 21, and the arrangement direction of the at least two battery cells 21 is a first direction, which may be specifically the length direction or the width direction of the housing 1.

[0134] The battery pack may include only one battery cell 2, or it may include two or more battery cells 2. In the case where the battery pack includes at least two battery cells 2, the at least two battery cells 2 are arranged along the second direction.

[0135] The second direction intersects the first direction. As an example, the second direction can be orthogonal to the first direction, such as when the first direction is the length direction of the box 1 and the second direction is the width direction of the box 1; or, the second direction can also form any suitable angle with the first direction.

[0136] Referring to Figure 6, the battery cell 21 includes a housing 211, an electrode assembly located within the housing 211, and terminal posts 212 disposed on the housing 211. As an example, the electrode assembly includes a positive electrode and a negative electrode, and the terminal posts 212 include a positive terminal post 2121 and a negative terminal post 2122, which are respectively connected to the positive electrode and the negative electrode. The positive terminal post 2121 and the negative terminal post 2122 of the same battery cell 21 can be spaced apart along the aforementioned second direction.

[0137] The current collector 3 is used to combine the electrical energy of the battery cell 21. The specific structure of the current collector 3 is not limited, and it can be electrically connected to the terminal 212 of the battery cell 21, thereby connecting the battery cells 21 in series or in parallel.

[0138] As an example, referring to Figures 6, 8 and 9, a current-combining device 3 is provided between each pair of adjacent battery cells 21 in a battery cell 2, and the current-combining device 3 is electrically connected to the terminal post 212 of the corresponding two adjacent battery cells 21.

[0139] The busbar 3 can be an aluminum busbar, a copper-aluminum busbar, or other conductive devices, and there are no restrictions on this. The busbar 3 can be generally plate-shaped and located on the top side of the corresponding battery cell 21.

[0140] A busbar 3 is provided between each pair of adjacent battery cells 21 in battery cell 2. The busbar 3 can connect two adjacent battery cells 21 in parallel or in series, without limitation. Taking a battery pack used for powering a vehicle as an example, the battery pack needs to have a sufficiently high operating voltage, so the busbar 3 usually connects two adjacent battery cells 21 in series.

[0141] Taking the combination device 3 connecting two adjacent battery cells 21 in series as an example, the combination device 3 can be electrically connected to the positive terminal 2121 of one of the battery cells 21 and to the negative terminal 2122 of the other battery cell 21.

[0142] As mentioned above, in some embodiments, the battery pack may include at least two battery cells 2, and the at least two battery cells 2 may be connected in series and arranged along a second direction. In these embodiments, the battery pack includes a bridging device 6, which is provided between every two adjacent battery cells 2. The bridging device 6 can connect two battery cells 2 in series or in parallel. Taking a battery pack used for powering a vehicle as an example, the bridging device 6 can connect two battery cells 2 in series.

[0143] Specifically, the jumper device 6 can be connected to a battery cell 21 on one side of one battery cell 2 along the first direction, and to a battery cell 21 on the same side of another battery cell 2, thereby connecting the two battery cells 2 in series or in parallel. The specific structure of the jumper device 6 can be referred to the busbar device 3, and will not be described in detail here.

[0144] Temperature sensing device 4 may include a temperature sensor, such as a thermistor. There are multiple temperature sensing devices 4, which are distributed in different locations in the battery pack. In actual operation, the working status of each battery cell 21 can be comprehensively evaluated based on the temperature measured by multiple temperature sensing devices 4.

[0145] The temperature measuring device 4 of this embodiment includes at least one first temperature measuring element 41 and at least one second temperature measuring element 42. The first temperature measuring element 41 is in contact with a first temperature measuring point, and the second temperature measuring element 42 is in contact with a second temperature measuring point. That is, the first temperature measuring element 41 is in contact with the outer casing 211 of the corresponding battery cell 21, and the second temperature measuring element 42 is in contact with the terminal post 212 of the corresponding battery cell 21 and / or the corresponding busbar device 3.

[0146] It should be noted that the contact setting here specifically refers to a contact setting in which the temperature measuring device 4 can detect the temperature at that location within the allowable error range. Taking the contact between the first temperature measuring element 41 and the outer casing 211 of the corresponding battery cell 21 as an example, the temperature measuring surface of the first temperature measuring element 41 can directly contact the outer casing 211 of the battery cell 21, or indirectly contact the outer casing 211 of the battery cell 21 (such as through a silicone thermal pad, thermal adhesive, or other thermally conductive structure), as long as the error between the actual temperature detected by the first temperature measuring element 41 and the actual temperature of the outer casing 211 of the battery cell 21 is within the allowable range (e.g., the error is less than 3℃, 2℃, 1℃, 0.5℃, etc.).

[0147] The second temperature sensing element 42 may contact only the terminal 212 of the corresponding battery cell 21, or only the busbar 3 electrically connected to the terminal 212 of the corresponding battery cell 21, or simultaneously contact both the terminal 212 of the corresponding battery cell 21 and the busbar 3 electrically connected to the terminal 212; there are no restrictions on this. Similar to the first temperature sensing element 41, the second temperature sensing element 42 may directly contact the aforementioned parts, or indirectly contact the aforementioned parts.

[0148] The first temperature measuring element 41 and the second temperature measuring element 42 can have the same structure. For example, the first temperature measuring element 41 and the second temperature measuring element 42 can be the same type of temperature sensor, with the only difference being their different positions. Alternatively, the first temperature measuring element 41 and the second temperature measuring element 42 can also have different structures, and there is no restriction on this.

[0149] The first temperature measuring element 41 and the second temperature measuring element 42 can output the temperature data they measure to the external control system. The external control system can determine the working status of each battery cell 21 in the battery pack based on the temperature data measured by the first temperature measuring element 41 and the second temperature measuring element 42, and then adjust the charging and discharging strategy of the battery pack, etc.

[0150] As an example, referring to Figures 8 and 9, the battery pack may include a circuit board 5, and a first temperature sensor 41 and a second temperature sensor 42 may be electrically connected to the circuit board 5. The circuit board 5 may be a flexible printed circuit board (FPC) or other types of circuit boards, without limitation. A connector 51 may be provided on the circuit board 5 for connection to a control system. For example, in an embodiment where the battery pack includes a temperature correction device 400, the connector is used to connect to the temperature correction device 400, thereby transmitting the temperature data measured by the first temperature sensor 41 and the second temperature sensor 42 to the temperature correction device 400.

[0151] More specifically, each battery cell 2 can be provided with a corresponding circuit board 5. The circuit board 5 can be located on the top side of each battery cell 21 of the corresponding battery cell 2 and extends along the first direction. The positive terminal 2121 and negative terminal 2122 of the battery cell 21 are arranged along the second direction. The current collector 3 corresponding to the positive terminal 2121 and negative terminal 2122 of the same battery cell 21 can form a gap, and the circuit board 5 can be disposed in the gap. The two opposite sides of the circuit board 5 along the second direction can be connected to the corresponding current collector 3. That is, the circuit board 5 extends along the first direction and is disposed on one side of the current collector 3 along the second direction (or, each current collector 3 is disposed on the opposite sides of the circuit board 5 along the second direction).

[0152] It should be noted that the battery pack may not include the circuit board 5, and the first temperature measuring element 41 and the second temperature measuring element 42 may also be connected to the control system in other ways, such as through wires.

[0153] The battery pack also includes at least one of the temperature correction device 400 as described in any of the above embodiments, a computer device, and a computer-readable storage medium. The temperature data collected by the first temperature measuring element 41 and the second temperature measuring element 42 can be transmitted to the temperature correction device 400, the processor of the computer device, and / or a processor for executing the computer program stored in the computer-readable storage medium, so that the temperature correction device and / or the processor execute the relevant steps in the temperature correction method of any of the above embodiments.

[0154] In this embodiment, the first temperature measuring element 41 can measure the temperature of the outer casing 211 of the corresponding battery cell 21, and the second temperature measuring element 42 can measure the temperature of the corresponding charged portion. Thus, in actual operation, the temperature correction method of any of the above embodiments can be used to obtain the corrected temperature of each first temperature measuring point, thereby enabling a more accurate determination of the working state of each battery cell 21 in the battery pack, and improving the charging and discharging performance and safety of the battery pack.

[0155] In some embodiments, at least one second temperature measuring element 42 is located in one end region of the housing 1 along the first direction, at least one second temperature measuring element 42 is located in the other end region of the housing 1 along the first direction, and at least one second temperature measuring element 42 is located in the middle region of the housing 1 along the first direction.

[0156] It is understood that the end region, which is relatively close to the end wall of the housing 1, has a relatively large heat exchange with the external environment, while the middle region has a relatively small heat exchange with the external environment. Therefore, there is a certain difference between the temperature of the charged part in the end region and the temperature of the charged part in the middle region. In this embodiment, at least one second temperature measuring element 42 is provided in each of these regions. This helps to more comprehensively measure the temperature of the charged part at various locations of the housing 1, further improve the accuracy of judging the operating status of the battery cell 21, and thus improve the charging and discharging performance and safety of the battery pack.

[0157] It should be noted that the end region here specifically refers to the region where a single battery cell 21 is located at the end of the battery cell 2 along the first direction. That is, at least one of the terminal post 212 of the single battery cell 21 at the end of the battery cell 2 along the first direction and the current collector 3 electrically connected to the terminal post 212 is in contact with the second temperature measuring element 42. The middle region refers to the region between the two end regions.

[0158] In some embodiments, the battery pack includes at least two battery cells 2, which are arranged along a second direction, and each second temperature measuring element 42 is arranged along a third direction. The first direction, the second direction, and the third direction intersect each other, and the first direction, the second direction, and the third direction are all perpendicular to the height direction of the battery pack.

[0159] In this embodiment, the second temperature measuring element 42 is distributed along a third direction that intersects both the first and second directions. In this way, not only can the temperature of the charged parts in the two end regions be measured, but also the temperature of the charged parts in the diagonal regions on both sides can be measured, making the measurement more comprehensive.

[0160] As an example, the third direction can be the diagonal direction of the housing 1, or a direction close to the diagonal of the housing 1, such as an angle between the diagonal of the housing 1 and the diagonal not exceeding 5°, 10°, or 15°. It should be noted that the distribution of the second temperature measuring element 42 along the third direction specifically means that, assuming a coordinate system is constructed, the position coordinates of each second temperature measuring element 42 are fitted into a virtual line, and the extension direction of this virtual line is the third direction.

[0161] In some embodiments, the housing 211 includes a metal housing 2111 and an insulating film 2112. The electrode assembly is located inside the metal housing 2111, and the electrode post 212 is disposed on the metal housing 2111. The insulating film 2112 covers the outside of the metal housing 2111 and has a clearance opening 2112a. The metal housing 2111 is partially exposed in the clearance opening 2112a, and the first temperature sensing element 41 is at least partially located inside the clearance opening 2112a to contact the metal housing 2111.

[0162] It is understandable that the metal casing 2111 helps reduce the possibility of safety problems such as open circuit, combustion, and explosion of the battery cell 21. The metal casing 2111 can be made of metal materials such as stainless steel and aluminum alloy. Since the casings 211 of two adjacent battery cells 21 may come into contact, the metal casing 2111 is wrapped with an insulating film 2112.

[0163] The installation of the insulating film 2112 may have a certain impact on heat conduction. In this embodiment, an avoidance opening 2112a is provided on the insulating film 2112, so that the first temperature measuring element 41 can be protected from the influence of the insulating film 2112, thereby improving the accuracy of its temperature measurement of the outer casing 211 of the battery cell 21.

[0164] In some embodiments, the battery cell 21 further includes an explosion-proof valve 213, which is disposed in the metal housing 2111 and located within the clearance opening 2112a. This reduces the number of openings in the insulating film 2112 and improves the insulation of the battery cell 21. The specific structure of the explosion-proof valve 213 is described in accordance with relevant technologies in the art and will not be repeated here.

[0165] In some embodiments, the metal housing 2111 includes a main housing 2111a and an end cap 2111b. The end cap 2111b covers the main housing 2111a. The electrode assembly is located within the space enclosed by the end cap 2111b and the main housing 2111a. The electrode post 212 is disposed on the end cap 2111b. The insulating film 2112 spans across the main housing 2111a and the end cap 2111b. The clearance opening 2112a is located on the side of the end cap 2111b away from the main housing 2111a, corresponding to the contact between the first temperature measuring element 41 and the end cap 2111b.

[0166] In this embodiment, the first temperature sensing element 41 contacts the end cap 2111b instead of the main casing 2111a. This reduces the gap between the main casings 2111a of two adjacent battery cells 21 (eliminating the need to reserve space for the installation of the first temperature sensing element 41), making the arrangement of the battery cells 21 more compact and improving the energy density of the battery pack. Furthermore, it facilitates the electrical connection between the first temperature sensing element 41 and the external control system.

[0167] In some embodiments, the second temperature measuring element 42 contacts the busbar device 3.

[0168] It is understood that the current collector 3 needs to be electrically connected to the terminal 212 of the corresponding battery cell 21, which will cause some obstruction to the terminal 212. Therefore, in this embodiment, the second temperature measuring element 42 is made to contact the current collector 3, thereby reducing the difficulty of laying out the second temperature measuring element 42 and facilitating the electrical connection between the second temperature measuring element 42 and the external control system.

[0169] In some embodiments, the busbar device 3 specifically includes a busbar body 31 and a voltage sensor. The busbar body 31 is electrically connected to the terminals 212 of two adjacent battery cells 21. The voltage sampler 32 is electrically connected to the busbar body 31, and the corresponding second temperature measuring element 42 is in contact with the voltage sampler 32.

[0170] In this embodiment, the second temperature measuring element 42 is in contact with the voltage sampler 32, thereby further reducing its assembly difficulty.

[0171] In this embodiment, the voltage sampler 32 can be a nickel plate or other conductive device, which is mainly used to measure the voltage signal of the bus body 31 and transmit the voltage signal to the external control system.

[0172] As an example, the second temperature measuring element 42 can be connected to the nickel sheet by ultrasonic welding, and thermally conductive colloid can be applied at the connection point. This can improve the stability of the contact between the second temperature measuring element 42 and the nickel sheet, and improve the accuracy of temperature measurement by the second temperature measuring element 42.

[0173] In the embodiment described above, where the circuit board 5 is provided, the voltage sampler 32 can extend along a second direction. The voltage sampler 32 along the second direction may include a first segment contacting the bus device 3 and a second segment contacting the circuit board 5. The second temperature sensing element 42 can be located in the second segment of the voltage sampler 32 and electrically connected to the circuit board 5. This further simplifies the electrical connection structure between the second temperature sensing element 42 and the circuit board 5, thereby further reducing its assembly difficulty. Obviously, the location of the second temperature sensing element 42 is not limited to this; it can also be located in the first segment of the voltage sampler 32.

[0174] It should be noted that a voltage sampler 32 should be provided on the busbar 3 regardless of whether it needs to contact the corresponding second temperature measuring element 42. In other words, each busbar 3 in the battery pack includes a busbar body 31 and a voltage sampler 32, but only a portion of the voltage sampler 32 may contact the second temperature measuring element 42. Compared to the voltage sampler 32 that does not contact the second temperature measuring element 42, the voltage sampler 32 that does contact the second temperature measuring element 42 can have a larger surface area (e.g., in the above embodiment, it can have a longer length along the second direction) to provide sufficient installation space for the second temperature measuring element 42.

[0175] In some embodiments, referring to Figures 10 and 11, the busbar body 31 may have a clearance notch 31a on one side along the first direction, while the voltage sampler 32 is connected to the other side of the busbar body 31 along the first direction, with the corresponding first temperature measuring element 41 at least partially located in the clearance notch 31a to contact the housing 211 of the corresponding battery cell 21.

[0176] In this embodiment, the first temperature measuring element 41 and the voltage sampler 32 are located on opposite sides of the bus device 3 along the first direction. This facilitates the overall circuit arrangement of the first temperature measuring element 41, the voltage sampler 32 and the second temperature measuring element 42, and reduces interference between the circuits of the above components.

[0177] In this embodiment, the specific shape of the clearance notch 31a is not limited. In some embodiments described above, the outer shell 211 of the battery cell 21 includes an insulating film 2112, and the insulating film 2112 has a clearance opening 2112a. In these embodiments, the clearance notch 31a can be formed at the position of the clearance opening 2112a corresponding to the battery cell 21.

[0178] It should be noted that, regardless of whether the outer casing 211 of the corresponding battery cell 21 is in contact with the first temperature sensing element 41, the busbar body 31 of the busbar device 3 electrically connected to the terminal post 212 of the corresponding battery cell 21 can have a clearance notch 31a. In other words, the busbar body 31 of each busbar device 3 in the battery pack has a clearance notch 31a, but the first temperature sensing element 41 can be provided in only a portion of the clearance notches 31a.

[0179] In some embodiments, referring to Figures 11 and 12, the battery pack further includes a bracket 7. The bracket 7 is disposed on the side of the busbar 3 facing the battery cell 21 and connected to the busbar 3. The bracket 7 has a cutout portion 7a located within an avoidance notch 31a. The first temperature sensing element 41 is fixedly connected to the bracket 7 and is at least partially located within the cutout portion 7a. This improves the stability of the installation of the first temperature sensing element 41 and reduces the possibility of displacement of the first temperature sensing element 41 during actual use.

[0180] In this embodiment, the first temperature measuring element 41 is fixed by means of the bracket 7, which can improve the installation stability of the first temperature measuring element 41. As an example, the bracket 7 can extend along the second direction, and its opposite ends along the second direction can be connected to a bus device 3 respectively, thus further improving the installation stability of the first temperature measuring element 41.

[0181] In some embodiments, referring to Figures 3, 8, and 9, the battery pack further includes at least one circuit board 5 corresponding to at least one battery cell 2. The circuit board 5 extends along a first direction and is disposed on one side of the busbar device 3 along a second direction, which intersects the first direction. An avoidance notch 31a is located on the side of the busbar body 31 near the circuit board 5. The first temperature measuring element 41, the second temperature measuring element 42, and the voltage sampler 32 are all electrically connected to the circuit board 5.

[0182] Figure 3 shows the connection points of the temperature measuring device 4, the voltage sampler 32 and the circuit board 5 in this embodiment of the present disclosure. Specifically, Figure 3 shows two circuit boards 5 corresponding to two battery units 2. The two battery units 2 are connected in series, and each battery cell 21 in the battery unit 2 is also connected in series. Points V1-V26 are the connection points of the voltage sampler 32 and the circuit board 5, and points NTC1-NTC14 are the connection points of the temperature measuring device 4 and the circuit board 5.

[0183] As can be seen, the configuration method adopted in this embodiment simplifies the circuit structure within the battery pack, saves space, and thus helps to improve the energy density of the battery pack. The specific configuration of circuit board 5 can be found in the descriptions of the relevant locations above, and will not be repeated here.

[0184] In some embodiments, a current-combining device 3 is provided between each two adjacent battery cells 21 of the battery cell 2, and the current-combining device 3 is electrically connected to the terminal post 212 of the corresponding two adjacent battery cells 21; the outer shell 211, the terminal post 212 and the current-combining device 3 electrically connected to the terminal post 212 of the corresponding battery cell 21 are selectively in contact with the temperature measuring device 4.

[0185] In this embodiment, for a single battery cell 21, if its outer casing 211 has already contacted the first temperature sensing element 41, then its terminal 212 and the current collector 3 electrically connected to the terminal 212 will not contact the second temperature sensing element 42, and vice versa. In other words, for a single battery cell 21, it will only have one of the first temperature sensing element 41 or the second temperature sensing element 42. Thus, the total number of the first temperature sensing element 41 and the second temperature sensing element 42 will not exceed the total number of battery cells 21, reducing temperature measurement costs and data processing volume.

[0186] In some embodiments, to further reduce temperature measurement costs and data processing volume, only a portion of the battery cell 21's casing 211, terminal post 212, and current collector 3 electrically connected to the terminal post 212 may selectively contact the temperature measuring device 4, while the other portion of the battery cell 21's casing 211, terminal post 212, and current collector 3 electrically connected to the terminal post 212 may not contact the temperature measuring device 4. That is, the total number of the first temperature measuring element 41 and the second temperature measuring element 42 is less than the total number of battery cells 21.

[0187] As an example, in every two adjacent battery cells 21, only one of the following components—the casing 211, the terminal 212, and the current collector 3 electrically connected to the terminal 212—may be in contact with the temperature measuring device 4: the casing 211, the terminal 212, and the current collector 3 electrically connected to the terminal 212. In the other battery cell 21, none of these components may be in contact with the temperature measuring device 4. This approach balances temperature measurement accuracy and cost.

[0188] Of course, in some embodiments, at least a portion of the battery cell 21's outer casing 211, terminal post 212, and multiple components of the current collector 3 electrically connected to the terminal post 212 are in contact with the temperature measuring device 4. That is, at least a portion of the battery cell 21 is simultaneously provided with a first temperature measuring element 41 and a second temperature measuring element 42, thereby further improving the accuracy of temperature measurement.

[0189] In some embodiments, the busbar 3 connects two adjacent battery cells 21 in series. This helps to increase the operating voltage of the battery pack and improve the charge / discharge rate of the battery pack, meeting relevant usage requirements.

[0190] In some embodiments, the battery pack includes at least two battery cells 2 and a bridging device 6, wherein a bridging device 6 is provided between every two adjacent battery cells 2, and the bridging device 6 connects the corresponding two adjacent battery cells 2 in series. This helps to further increase the operating voltage of the battery pack and improve the charge / discharge rate of the battery pack.

[0191] In the description of this disclosure, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this disclosure. In this disclosure, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine different embodiments or examples described in this disclosure, as well as features of different embodiments or examples, without contradiction.

[0192] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A method for temperature correction of a battery pack, the method comprising: The temperature of a first temperature measuring point of the battery pack is obtained, wherein the first temperature measuring point is located on the outer shell of the corresponding battery cell inside the battery pack; Obtain the temperature of a second temperature measuring point adjacent to the first temperature measuring point, wherein the second temperature measuring point is located at the terminal post and / or busbar of the corresponding battery cell within the battery pack; Determine whether the current value in the battery pack is greater than or equal to 150A. If so, correct the temperature of the first temperature measuring point based on the temperature of the second temperature measuring point to obtain the corrected temperature of the first temperature measuring point. If not, use the temperature of the second temperature measuring point as the corrected temperature of the first temperature measuring point.

2. The method according to claim 1, wherein, The step of obtaining the temperature of a second temperature measuring point adjacent to the first temperature measuring point includes: Determine the temperature measurement area where the first temperature measurement point is located; The temperature of the second temperature measuring point corresponding to the temperature measuring area is obtained, wherein the battery pack includes multiple temperature measuring areas, and each temperature measuring area corresponds to multiple first temperature measuring points and one second temperature measuring point.

3. The method according to claim 2, wherein, The number of temperature measuring areas is at least three, and they are distributed along a first direction of the battery pack, where the first direction is the arrangement direction of the individual battery cells in a battery cell of the battery pack.

4. The method according to claim 3, wherein, The battery cells of the battery pack are distributed along the second direction, and the second temperature measuring points corresponding to each temperature measuring area are distributed along the third direction. The first direction, the second direction, and the third direction intersect each other and are all perpendicular to the height direction of the battery pack.

5. The method according to any one of claims 1-4, wherein, The step of correcting the temperature of the first temperature measuring point based on the temperature of the second temperature measuring point includes: The higher value between the temperature of the first temperature measuring point and the temperature of the second temperature measuring point is used as the correction temperature of the first temperature measuring point.

6. The method according to any one of claims 1-4, wherein, The step of correcting the temperature of the first temperature measuring point based on the temperature of the second temperature measuring point includes: The temperature of the second temperature measuring point is corrected based on the ambient temperature inside the battery pack and / or the current value of the battery pack, to obtain the corrected temperature of the second temperature measuring point; The higher value between the temperature of the first temperature measuring point and the corrected temperature of the second temperature measuring point is taken as the corrected temperature of the first temperature measuring point.

7. The method according to claim 6, wherein, The step of correcting the temperature of the second temperature measuring point based on the ambient temperature and / or current value within the battery pack includes: A correction value is determined based on the current value, and the correction value is positively correlated with the current value within at least a certain range; Subtract the correction value from the temperature of the second temperature measuring point to obtain the corrected temperature of the second temperature measuring point.

8. The method according to claim 6, wherein, The step of correcting the temperature of the second temperature measuring point based on the ambient temperature and / or current value within the battery pack includes: A correction strategy is selected based on the ambient temperature, wherein if the ambient temperature is lower than the set temperature, a first correction strategy is selected, and if the ambient temperature is greater than or equal to the set temperature, a second correction strategy is selected. A correction value is determined based on the current value and the selected correction strategy, wherein the correction value is positively correlated with the current value within at least a partial range, and the correction value corresponding to the first correction strategy is less than the correction value corresponding to the second correction strategy. Subtract the correction value from the temperature of the second temperature measuring point to obtain the corrected temperature of the second temperature measuring point.

9. The method according to claim 7 or 8, wherein, The correction value increases in a stepwise manner as the current value increases.

10. A temperature correction device for a battery pack, the temperature correction device comprising: The first acquisition module is configured to acquire the temperature of a first temperature measuring point of the battery pack, wherein the first temperature measuring point is located on the outer shell of the corresponding battery cell inside the battery pack; The second acquisition module is configured to acquire the temperature of a second temperature measurement point adjacent to the first temperature measurement point, wherein the second temperature measurement point is located at the terminal post and / or busbar of the corresponding battery cell. The correction module is configured to determine whether the current value in the battery pack is greater than or equal to 150A. If so, the temperature of the first temperature measuring point is corrected according to the temperature of the second temperature measuring point to obtain the corrected temperature of the first temperature measuring point. If not, the temperature of the second temperature measuring point is used as the corrected temperature of the first temperature measuring point.

11. A computer device comprising a memory and a processor, the memory storing a computer program executable on the processor, the processor executing the computer program to implement the steps of the temperature correction method for a battery pack according to any one of claims 1 to 9.

12. A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the temperature correction method for a battery pack according to any one of claims 1 to 9.

13. A battery pack, the battery pack comprising: Box; At least one battery cell is located inside the housing. The battery cell includes at least two individual battery cells, and the arrangement direction of the at least two individual battery cells is a first direction. Each individual battery cell includes a housing, an electrode assembly located inside the housing, and a terminal post disposed on the housing. The terminal post is electrically connected to the electrode assembly. A combiner device for combining the electrical energy of the battery cells; A temperature measuring device includes at least one first temperature measuring element and at least one second temperature measuring element, wherein the first temperature measuring element is in contact with a first temperature measuring point and the second temperature measuring element is in contact with a second temperature measuring point; as well as The temperature correction device for the battery pack of claim 10, the computer device of claim 11, and the computer-readable storage medium of claim 12 are at least one of the following:

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