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

Abstract

The embodiments of the present application provide a temperature correction method, device, equipment, medium and battery pack for a battery pack. The method includes: obtaining the temperature of a first temperature measurement point of the battery pack, the first temperature measurement point is located at the outer shell of the corresponding battery cell in the battery pack; obtaining the temperature of a second temperature measurement point adjacent to the first temperature measurement point, the second temperature measurement point is located at the pole and / or the busbar of the corresponding battery cell in the battery pack; judging whether the current value in the battery pack is greater than or equal to 150A, if so, correcting the temperature of the first temperature measurement point according to the temperature of the second temperature measurement point to obtain the corrected temperature of the first temperature measurement point, if not, using the temperature of the second temperature measurement point as the corrected temperature of the first temperature measurement point. The temperature correction method, device, equipment, medium and battery pack of the battery pack of the embodiments of the present application can improve the safety of use and the charging and discharging performance of the battery pack.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a temperature correction method, device, equipment, medium and battery pack for a battery pack. Background Art

[0002] Temperature is an important control parameter of the battery during operation, which directly affects battery safety and battery charging and discharging strategies. Therefore, temperature sampling is extremely important to the operation and safety of the battery.

[0003] In the related art, temperature sensors represented by thermistors are generally used for temperature sampling. The temperature sensors are set at temperature measurement points in the battery pack. The layout of the temperature measurement points and the temperature measurement data processing method will affect the accuracy of the judgment of the working status of the battery cells, and thus affect the charging and discharging performance and safety of the battery pack. Summary of the invention

[0004] In view of this, the embodiments of the present application hope to provide a temperature correction method, device, equipment, medium and battery pack for a battery pack, aiming to improve the accuracy of judging the working status of the battery cells, thereby improving the charging and discharging performance and safety of the battery pack.

[0005] To achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0006] A first aspect of an embodiment of the present application provides a temperature correction method for a battery pack, the method comprising: obtaining the temperature of a first temperature measuring point of the battery pack, the first temperature measuring point being located at the outer shell of a corresponding battery cell in the battery pack; obtaining the temperature of a second temperature measuring point adjacent to the first temperature measuring point, the second temperature measuring point being located at the pole and / or the busbar of the corresponding battery cell in the battery pack; determining whether the current value in the battery pack is greater than or equal to 150A, and if so, correcting 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, and if not, using the temperature of the second temperature measuring point as the corrected temperature of the first temperature measuring point.

[0007] In this embodiment, the temperature of the first temperature measuring point is corrected with the help of the temperature of the second temperature measuring point, that is, the outer shell temperature of the battery cell is corrected according to the temperature of the charged part adjacent to the battery cell, so that the difference between the outer shell temperature and the charged part temperature can be compensated to a certain extent. The corrected temperature will help to more accurately judge the working status of the battery cell, thereby improving the safety of use and the charging and discharging performance of the battery pack.

[0008] Furthermore, since the second temperature measuring point is located at a charged part, that is, a position electrically connected to the electrode assembly of the battery cell, when the current value is relatively small, the temperature of the second temperature measuring point can more truly reflect the actual working state of the battery cell. For this reason, 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 the accuracy on the one hand and save the amount of calculation on the other hand.

[0009] In some embodiments, obtaining the temperature of a second temperature measurement point adjacent to the first temperature measurement point includes: determining the temperature measurement area in which the first temperature measurement point is located; obtaining the temperature of the second temperature measurement point corresponding to the temperature measurement area, wherein the battery pack includes a plurality of the temperature measurement areas, and each of the temperature measurement areas corresponds to a plurality of the first temperature measurement points and one of the second temperature measurement points.

[0010] In this embodiment, the battery pack is divided into multiple temperature measurement areas. In this way, a second temperature measurement point adjacent to the first temperature measurement point can be directly determined according to the temperature measurement area where the first temperature measurement point is located, saving calculation amount and improving efficiency. On the other hand, in this embodiment, each temperature measurement area corresponds to a 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 a one-to-one correspondence with the first temperature measurement points. In this way, the total number of temperature measurement devices arranged in the battery pack can be reduced, thereby reducing the cost of the battery pack.

[0011] In some embodiments, the number of the temperature measurement areas is at least three, and the temperature measurement areas are distributed along a first direction of the battery pack, where the first direction is an arrangement direction of the battery cells in a battery unit of the battery pack.

[0012] It can be understood that the heat exchange between the battery cells and the charged parts near the end areas on both sides of the battery pack and the external structure is relatively large, while the heat exchange between the battery cells and the charged parts near the middle area of ​​the battery pack and the external structure is relatively small, so there is a temperature difference. In this embodiment, at least three temperature measurement areas are distributed along the arrangement direction of the battery cells in the battery cells of the battery pack, that is, the end areas on both sides and the middle area are distinguished. In this way, it is possible to avoid using the temperature of the second temperature measurement point in the middle area to correct the temperature of the first temperature measurement point in the end area, thereby improving the accuracy of the correction.

[0013] In some embodiments, the battery cells of the battery pack are distributed along a second direction, the second temperature measurement points corresponding to each of the temperature measurement areas are distributed along a third direction, and 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.

[0014] In this embodiment, on the basis of each temperature measurement area being distributed along the first direction, the second temperature measurement points corresponding to each temperature measurement area are distributed along a third direction, and the third direction intersects with both the first direction and the second direction. In this way, the two side end areas and the middle area in the second direction (distribution direction of the battery cells) can be further distinguished, thereby further improving the accuracy of the correction.

[0015] In some embodiments, correcting the temperature of the first temperature measuring point according to the temperature of the second temperature measuring point includes: using a 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.

[0016] In this embodiment, the higher value between the temperature at the first temperature measuring point and the temperature at the second temperature measuring point is taken as the correction temperature. In this way, the sensitivity of the high temperature warning for the battery cell can be improved, thereby improving the safety of the battery pack.

[0017] In some embodiments, correcting the temperature of the first temperature measuring point according to the temperature of the second temperature measuring point includes: correcting the temperature of the second temperature measuring point according to the ambient temperature in 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.

[0018] In this embodiment, the temperature of the second temperature measuring point is first corrected according to 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 according to the corrected temperature of the second temperature measuring point. That is, double correction is performed, which can further improve the accuracy.

[0019] In some embodiments, correcting the temperature of the second temperature measuring point according to the ambient temperature and / or current value in the battery pack includes: determining a correction value according to the current value, the correction value being positively correlated with the current value in 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.

[0020] In this embodiment, the temperature of the second temperature measuring point is corrected based on the current value alone, thus saving calculation complexity.

[0021] In some embodiments, correcting the temperature of the second temperature measuring point according to the ambient temperature and / or current value in the battery pack includes: selecting a correction strategy according to the ambient temperature, wherein if the ambient temperature is less 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 according to the current value and the selected correction strategy, wherein the correction value is positively correlated with the current value in 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; subtracting the correction value from the temperature of the second temperature measuring point to obtain the corrected temperature of the second temperature measuring point.

[0022] In this embodiment, the current value and the ambient temperature are comprehensively considered to determine the correction value, thereby further improving the accuracy.

[0023] In some embodiments, the correction value increases step by step as the current value increases.

[0024] In this embodiment, the amount of calculation can be reduced.

[0025] A second aspect of an embodiment of the present application provides a temperature correction device for a battery pack, the temperature correction device comprising: a first acquisition module, used to acquire the temperature of a first temperature measuring point of the battery pack, the first temperature measuring point being located at the outer shell of a corresponding battery cell in the battery pack; a second acquisition module, used to acquire the temperature of a second temperature measuring point adjacent to the first temperature measuring point, the second temperature measuring point being located at a pole and / or a busbar corresponding to the battery cell; a correction module, used to determine whether the current value in the battery pack is greater than or equal to 150A, and if so, to 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, and if not, to use the temperature of the second temperature measuring point as the corrected temperature of the first temperature measuring point.

[0026] A third aspect of an embodiment of the present application provides a computer device, including a memory and a processor, wherein the memory stores a computer program that can be executed on the processor, and when the processor executes the computer program, it implements the steps in the temperature correction method of the battery pack of the first aspect of the embodiment of the present application.

[0027] A fourth aspect of an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps in the temperature correction method for a battery pack of the first aspect of an embodiment of the present application.

[0028] The fifth aspect of the embodiments of the present application provides a battery pack, which includes: a case; at least one battery cell located in the case, the battery cell including at least two battery cells, the arrangement direction of at least two of the battery cells of the battery cell is a first direction, the battery cell including an outer shell, an electrode assembly located in the outer shell and a pole arranged on the outer shell, the pole being electrically connected to the electrode assembly; a collector device for collecting the electric energy of the battery cells; a temperature measuring device including at least one first temperature measuring device and at least one second temperature measuring device, the first temperature measuring device being arranged in contact with a first temperature measuring point, and the second temperature measuring device being arranged in contact with a second temperature measuring point; and at least one of the temperature correction device of the battery pack of the second aspect of the embodiments of the present application, the computer device of the third aspect of the embodiments of the present application and the computer-readable storage medium of the fourth aspect of the embodiments of the present application.

[0029] The temperature correction device of the second aspect of the embodiment of the present application, the computer equipment of the third aspect of the embodiment of the present application, the computer-readable storage medium of the fourth aspect of the embodiment of the present application, that is, the battery pack of the fifth aspect of the embodiment of the present application have all the advantages of the temperature correction method of the battery pack of the first aspect of the embodiment of the present application, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic flow chart of a temperature correction method for a battery pack according to an embodiment of the present application;

[0031] Figure 2 A logic block diagram of a temperature correction method for a battery pack according to an embodiment of the present application;

[0032] Figure 3 A schematic diagram showing the distribution of the first temperature measuring point and the second temperature measuring point of the battery pack according to an embodiment of the present application;

[0033] Figure 4 This is a schematic structural diagram of a temperature correction device for a battery pack according to an embodiment of the present application;

[0034] Figure 5 A schematic diagram of the box structure of a battery pack according to an embodiment of the present application;

[0035] Figure 6 This is a schematic diagram of the structure of the box and the battery unit of an embodiment of the present application;

[0036] Figure 7 A schematic diagram of the structure of a battery cell according to an embodiment of the present application;

[0037] Figure 8 It is a schematic diagram of the top side structure of the current collecting device, the flexible circuit board and the temperature measuring device of the embodiment of the present application;

[0038] Fig. 9 It is a schematic diagram of the bottom structure of the current collecting device, the flexible circuit board and the temperature measuring device of the embodiment of the present application;

[0039] Fig.10 A schematic diagram of the structure of a current collector according to an embodiment of the present application;

[0040] Fig.11 for Figure 8 A magnified schematic diagram of part A;

[0041] Fig.12 Schematic diagram of the structure of the bracket of the embodiment of the present application.

[0042] Description of Reference Numerals

[0043] 1. Box body; 2. Battery unit; 21. Battery cell; 211. Shell; 2111. Metal shell; 2111a. Main shell; 2111b. End cover; 2112. Insulating film; 2112a. Avoidance; 212. Pole; 2121. Positive pole; 2122. Negative pole; 213. Explosion-proof valve; 3. Convergence device; 31. Convergence body; 31a. Avoidance gap; 32. Voltage sampler; 4. Temperature measuring device; 41. First temperature measuring device; 42. Second temperature measuring device; 5. Circuit board; 51. Connector; 6. Jumper device; 7. Bracket; 7a. Hollow part. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions.

[0046] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0047] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, D and / or F can represent: D exists alone, D and F exist at the same time, and F exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0049] In the description of the embodiments of the present application, the orientation or position relationship indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0050] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0051] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0052] In the description of this application, the orientations or positional relationships such as "first direction", "second direction", "third direction", and "height direction" are based on the orientations or positional relationships shown in the accompanying drawings, wherein the "first direction" is the direction indicated by the arrow L1 in the accompanying drawings, the "second direction" is the direction indicated by the arrow L2 in the accompanying drawings, and the "third direction" is the direction indicated by the arrow L3 in the accompanying drawings. It should be understood that these orientation terms are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0053] With the country's vigorous promotion of new energy vehicles, new energy vehicles have ushered in a great opportunity for development. The safety and stability of automobiles have always been people's greatest concern. Therefore, improving the safety of new energy vehicles will be one of the important factors that determine whether new energy vehicles can be quickly popularized. Battery cells are the main components of the battery pack of new energy vehicles. Improving the safety of battery cells is an important way to improve the safety of new energy vehicles.

[0054] A battery unit usually includes multiple battery cells, which are confined in a frame formed by welding end plates and side plates. During the assembly process of the battery unit, the end plates at both ends have a certain pre-tightening force on the battery to enhance and improve the battery's cycle performance.

[0055] The battery cell includes a shell, an electrode assembly disposed in the shell, and a pole disposed in the shell, and the pole is electrically connected to the electrode assembly. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator, and the pole includes a positive pole and a negative pole, which are electrically connected to the positive electrode sheet and the negative electrode sheet, respectively.

[0056] Battery cells mainly rely on the movement of metal ions between the positive and negative electrodes to work. The positive electrode sheet includes 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. The current collector not coated with the positive active material layer protrudes from the current collector coated with the positive active material layer. The current collector not coated with the positive active material layer is stacked as a positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode sheet includes 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. The current collector not coated with the negative active material layer protrudes from the current collector coated with the negative active material layer. The current collector not coated with the negative active material layer is stacked as a negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon. The material of the separator can be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly can be a wound structure or a stacked structure.

[0057] The battery pack is also equipped with an integrated busbar (Cells Contact System, CCS), which is mainly composed of a flexible printed circuit (FPC), a busbar (such as copper and aluminum busbars), a voltage sampler, a temperature measuring device, etc. The busbar, the voltage sampler and the temperature measuring device are all connected to the flexible printed circuit board.

[0058] The busbars are electrically connected to the poles of two connected battery cells respectively, so as to connect two adjacent battery cells in series or in parallel.

[0059] The voltage sampler generally includes a nickel sheet, which contacts the busbar of the busbar device and / or the battery cell and is electrically connected to the flexible circuit board, thereby jointly realizing voltage collection.

[0060] The temperature measuring device includes a temperature sensor represented by a thermistor (Negative Temperature Coefficient thermistor, NTC), which is arranged at a temperature measuring point in the battery pack.

[0061] In the related art, the temperature measuring device is usually in contact with the outer shell of the battery cell for temperature measurement, that is, the temperature measuring point is usually set on the outer shell of the battery cell. However, the research in this application found that there is a certain difference between the outer shell temperature of the battery cell and the temperature of the charged parts in the battery pack, which mainly include the electrode assembly, pole and busbar electrically connected to the pole of the battery cell.

[0062] The above temperature difference is particularly obvious when the charge and discharge rate of the battery pack is large. The charge and discharge rate refers to the ratio between the energy value and the power value of the battery pack. A large charge and discharge rate means that the current during the operation of the battery pack may be large (for example, it may be greater than 150A, or greater than 300A, or greater than 400A, or even greater than 500A). The thermal effect of the current will increase with the increase of the current value, thereby increasing the temperature difference between the outer shell of the battery cell and the charged part.

[0063] Therefore, when the charge and discharge rate of the battery pack is large, 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 battery cell based on the temperature of the battery cell casing, which may affect the safety of use and the charge and discharge performance of the battery pack.

[0064] To this end, a temperature correction method for a battery pack of an embodiment of the present application is proposed, and the temperature correction method of the embodiment of the present application includes: obtaining the temperature of a first temperature measurement point of the battery pack, the first temperature measurement point is located at the shell of the corresponding battery cell in the battery pack. Obtaining the temperature of a second temperature measurement point adjacent to the first temperature measurement point, the second temperature measurement point is located at the pole of the corresponding battery cell or a busbar electrically connected to the pole. Correcting the temperature of the first temperature measurement point according to the temperature of the second temperature measurement point to obtain the corrected temperature of the first temperature measurement point.

[0065] In this embodiment, the temperature of the first temperature measuring point is corrected with the help of the temperature of the second temperature measuring point, that is, the outer shell temperature of the battery cell is corrected according to the temperature of the charged part adjacent to the battery cell, so that the difference between the outer shell temperature and the charged part temperature can be compensated to a certain extent. The corrected temperature will help to more accurately judge the working status of the battery cell, thereby improving the safety of use and the charging and discharging performance of the battery pack.

[0066] According to some embodiments of the present application, referring to Figure 1 , the temperature correction method includes the following steps.

[0067] Step S101: obtaining the temperature of a first temperature measuring point of a battery pack, where the first temperature measuring point is located at an outer shell of a corresponding battery cell in the battery pack.

[0068] Step S102: acquiring the temperature of a second temperature measuring point adjacent to the first temperature measuring point, wherein the second temperature measuring point is located at at least one of a pole of a corresponding battery cell or a busbar electrically connected to the pole.

[0069] Step S103: 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 according to 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.

[0070] It can be understood that a battery pack is usually provided with a plurality of battery cells, and thus may have a plurality of first temperature measurement points, and each of the first temperature measurement points may be corrected by the temperature correction method provided in the embodiment of the present application.

[0071] In step S101 , the temperature of the first temperature measurement point may be obtained by communicating with a temperature measurement device in contact with the first temperature measurement point (ie, a temperature measurement device in contact with a housing of a corresponding battery cell).

[0072] Similar to the first temperature measuring point, the battery pack may have multiple second temperature measuring points. The number of the second temperature measuring points may be the same as the number of the first temperature measuring points, or may be more than the number of the first temperature measuring points, or may be less than the number of the first temperature measuring points. There is no limitation on this.

[0073] In step S102, what needs to be obtained is the temperature of a second temperature measuring point adjacent to the first temperature measuring point in step S101. The "adjacent" here refers to adjacent in a spatial sense. Specifically, the second temperature measuring point adjacent to the first temperature measuring point refers to a second temperature measuring point that has a relatively small straight-line distance with the first temperature measuring point in the spatial coordinate system within the battery pack.

[0074] It is understandable that there may be a certain difference in temperature between the second temperature measurement points at different positions in the battery pack. For example, the second temperature measurement point at the end area of ​​the box body close to the battery pack may have relatively more heat exchange with the external environment, while the second temperature measurement point close to the middle area may have relatively less heat exchange with the external environment, so there may be a certain difference in temperature between the two. For this reason, in this embodiment, the temperature of a second temperature measurement point adjacent to the first temperature measurement point is selected to further improve the accuracy.

[0075] In step S103, if the current value in the battery pack is greater than or equal to 150A, the temperature of a first temperature measurement point obtained in step S101 is corrected according to the temperature of a second temperature measurement point obtained in step S102, thereby obtaining a corrected temperature of the first temperature measurement point. The purpose of the correction is to compensate for the difference between the above 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 measurement point.

[0076] If the current value in the battery pack is less than 150A, the temperature of the second temperature measuring point is used as the correction temperature of the first temperature measuring point.

[0077] It can be understood that since the second temperature measuring point is located at the charged part, that is, the position electrically connected to the electrode assembly of the battery cell, when the current value is relatively small, the temperature of the second temperature measuring point can more truly reflect the actual working state of the battery cell. For this reason, 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 the accuracy on the one hand and save the amount of calculation on the other hand.

[0078] 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, rather than the current value of a certain battery cell.

[0079] As an example, the correction method may include but is not limited to taking the higher value, average value or weighted average value of the above two temperatures, or calculating the above two temperatures according to a specific calculation method, etc. Those skilled in the art can specifically select the correction method according to actual usage requirements.

[0080] In some embodiments, in step S102, "obtaining the temperature of a second temperature measurement point adjacent to the first temperature measurement point" may specifically include: determining the temperature measurement area where the first temperature measurement point is located, and obtaining the temperature of the second temperature measurement point corresponding to the temperature measurement area. The battery pack includes multiple temperature measurement areas, each temperature measurement area corresponds to multiple first temperature measurement points and one second temperature measurement point.

[0081] In this embodiment, the battery pack is divided into multiple temperature measurement areas. In this way, a second temperature measurement point adjacent to the first temperature measurement point can be directly determined based on the temperature measurement area where the first temperature measurement point is located, which saves calculation and improves efficiency. On the other hand, in this embodiment, each temperature measurement area corresponds to a 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 a one-to-one correspondence with the first temperature measurement points. In this way, the total number of temperature measurement devices arranged in the battery pack can be reduced, thereby reducing the cost of the battery pack. Further, it can be understood that the difference between the outer shell temperatures of battery cells at different positions in the battery pack is usually more significant than the difference between the temperatures of the live parts at different positions. For this reason, in this embodiment, it is chosen to reduce the number of second temperature measurement points rather than reducing the number of first temperature measurement points.

[0082] In some embodiments, a plurality of temperature measurement areas are distributed along a first direction of the battery pack, where the first direction is an arrangement direction of battery cells in a battery unit of the battery pack.

[0083] It can be understood that the heat exchange between the battery cells and the charged parts near the end areas on both sides of the battery pack and the external structure is relatively large, while the heat exchange between the battery cells and the charged parts near the middle area of ​​the battery pack and the external structure is relatively small, so there is a temperature difference. In this embodiment, at least three temperature measurement areas are distributed along the arrangement direction of the battery cells in the battery cells of the battery pack, that is, the end areas on both sides and the middle area are distinguished. In this way, it is possible to avoid using the temperature of the second temperature measurement point in the middle area to correct the temperature of the first temperature measurement point in the end area, thereby improving the accuracy of the correction.

[0084] In some embodiments, the battery cells of the battery pack are distributed along the second direction, the second temperature measurement points corresponding to each temperature measurement 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.

[0085] In this embodiment, on the basis of each temperature measurement area being distributed along the first direction, the second temperature measurement points corresponding to each temperature measurement area are distributed along a third direction, and the third direction intersects with both the first direction and the second direction. In this way, the two side end areas and the middle area in the second direction (distribution direction of the battery cells) can be further distinguished, thereby further improving the accuracy of the correction.

[0086] As an example, the first direction may be the length direction of the battery pack, the second direction may be the width direction of the battery pack, and the third direction may be the diagonal direction of the battery pack or a direction close to the diagonal direction, such as a direction with an angle of no more than 5°, no more than 10°, or no more than 15° with the diagonal direction of the battery pack.

[0087] Several specific methods of correcting the temperature of the first temperature measuring point according to the temperature of the second temperature measuring point will be provided below.

[0088] In some embodiments, in step S103, "correcting the temperature of the first temperature measuring point according to the temperature of the second temperature measuring point" specifically includes: taking 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.

[0089] In this embodiment, the higher value between the temperature at the first temperature measuring point and the temperature at the second temperature measuring point is taken as the correction temperature. In this way, the sensitivity of the high temperature warning for the battery cell can be improved, thereby improving the safety of the battery pack.

[0090] In other embodiments, in step S103, "correcting the temperature of the first temperature measuring point according to the temperature of the second temperature measuring point" includes: correcting the temperature of the second temperature measuring point according to the ambient temperature in 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.

[0091] In this embodiment, the temperature of the second temperature measuring point is first corrected according to 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 according to the corrected temperature of the second temperature measuring point. That is, double correction is performed, which can further improve the accuracy.

[0092] The difference between the ambient temperature inside the battery pack and the temperature at the first temperature measuring point and the temperature at the second temperature measuring point is that the temperature at the first temperature measuring point and the temperature at the second temperature measuring point are temperatures related to specific battery cells, while the ambient temperature inside the battery pack is a temperature related to the overall environment in which the battery cells in the battery pack are located. As an example, the ambient temperature inside the battery pack may be the temperature detected by a temperature sensor disposed on a control board of the battery pack or at other locations in the battery pack that are relatively far away from the battery cells.

[0093] It can be understood that when the actual heating value of the battery cells is the same, the actual measured temperature of the battery cells under different ambient temperatures is different. Correction with the help of ambient temperature helps to make the corrected temperature of the first temperature measurement point finally obtained more accurately reflect the actual heating value of the battery cells.

[0094] The current value of a battery pack refers to the input current value and / or output value of the battery pack. It can be understood that the current value is directly related to the heat generated by the thermal effect of the current. This part of the heat usually does not completely act on the battery cell. Using the current value for correction helps to make the corrected temperature of the first temperature measurement point finally obtained more accurately reflect the actual impact of the thermal effect of the current on the battery cell.

[0095] It can be understood that the temperature of the second temperature measuring point is relatively greatly affected by the ambient temperature and / or the current value. Therefore, in this embodiment, the correction based on the ambient temperature and / or the current value is performed on the temperature of the second temperature measuring point, thereby improving accuracy. The specific method of performing correction based on the ambient temperature and / or the current value can be to determine the correction value based on the ambient temperature and / or the current value, and then subtract the correction value during the correction process. This correction method may have the possibility that the corrected temperature is too low. 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 of the two 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.

[0096] In this embodiment, correction can be performed only based on the current value, only based on the ambient temperature, or based on both the current value and the ambient temperature. Two specific methods for correcting the temperature of the second temperature measuring point are provided below.

[0097] In some embodiments, "correcting the temperature of the second temperature measuring point according to the ambient temperature and / or current value in the battery pack" specifically includes: determining a correction value according to the current value, the correction value and the current value are positively correlated in at least a partial range; subtracting the correction value from the temperature of the second temperature measuring point to obtain the corrected temperature of the second temperature measuring point.

[0098] In this embodiment, the temperature of the second temperature measuring point is corrected based on the current value alone, thus saving calculation complexity.

[0099] 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 is no limitation on this. As an example, the correction value can be increased in a step-by-step manner as the current value increases, so that the amount of calculation can be saved. For example, when the current value is greater than or equal to 150A and less than 300A, the correction value is 1, when the current value is greater than or equal to 300A and less than 400A, the correction value is 2, when the current value is greater than or equal to 400A and less than 500A, the correction value is 4, and when the current value is greater than or equal to 500A, the correction value is 6, and the unit of the above correction value is degrees Celsius. Of course, the correction value can also be positively correlated with the current value in other forms.

[0100] In other embodiments, "correcting the temperature of the second temperature measuring point according to the ambient temperature and / or current value in the battery pack" specifically includes: selecting a correction strategy according to the ambient temperature, wherein if the ambient temperature is lower than the set temperature, the first correction strategy is selected, and if the ambient temperature is greater than or equal to the set temperature, the second correction strategy is selected; determining a correction value according to the current value and the selected correction strategy, wherein the correction value corresponding to the first correction strategy is lower 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.

[0101] In this embodiment, the current value and the ambient temperature are comprehensively considered to determine the correction value, thereby further improving the accuracy.

[0102] It should be noted that “the correction value corresponding to the first correction strategy is smaller than the correction value corresponding to the second correction strategy” here specifically means that, for the same current value, the correction value when the first correction strategy is adopted is smaller than the correction value when the second correction strategy is adopted.

[0103] The set temperature may be specifically determined by those skilled in the art according to the actual use environment of the battery pack. As an example, the set temperature may be 0°C.

[0104] 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 is no limitation on this. As an example, the correction value can increase in a step-by-step manner as the current value increases. For example, 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 first 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 units of the above correction values ​​are degrees Celsius.

[0105] In some embodiments, the correction value in the above embodiments increases step by step with the increase of the current value, thereby reducing the amount of calculation.

[0106] The temperature correction method of the battery pack in one or more of the above embodiments will be described in more detail and specifically in conjunction with a specific embodiment below.

[0107] The ambient temperature T in the battery pack, the current value I, the temperature Td1 of a first temperature measuring point, and the temperature Tb1 of a second temperature measuring point adjacent to the first temperature measuring point are obtained.

[0108] Reference Figure 2 , Figure 2 , a logic block diagram 200 of an embodiment of the present application is shown. Referring to the logic block diagram 200, no matter the ambient temperature T is between -20°C and 0°C (excluding the endpoints) or greater than or equal to 0°C, 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.

[0109] When the current value I is greater than or equal to 150A, the correction value is determined according to the current value I and the ambient temperature T, and the correction value is subtracted from the temperature Tb1 of the second temperature measuring point to obtain the corrected temperature of the second temperature measuring point, and then the higher value between the corrected temperature of the first temperature measuring point Td1 and the second temperature measuring point is taken as the corrected temperature Tbx1 of the first temperature measuring point, that is, Tbx1=MAX{Td1, Tb1-correction value}.

[0110] The correction value is determined by the ambient temperature and the current value. First, the correction strategy is selected according to the ambient temperature, and then the correction value is determined according to 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℃, the battery pack may need to be stopped.

[0111] Specifically, if the ambient temperature I is between -20℃ and 0℃, the first correction strategy is selected. At this time, if 150A≤I<300A, the correction value is 1, Tbx1=MAX{Td1, Tb1-1}. If 300A≤I<400A, the correction value is 2, Tbx1=MAX{Td1, Tb1-2}. If 400A≤I<500A, the correction value is 4, Tbx1=MAX{Td1, Tb1-4}. If I≥500A, the correction value is 6, Tbx1=MAX{Td1, Tb1-6}.

[0112] If the ambient temperature I is greater than or equal to 0°C, select the second correction strategy. At this time, if 150A≤I<300A, the correction value is 2, Tbx1=MAX{Td1, Tb1-2}. If 300A≤I<400A, the correction value is 4, Tbx1=MAX{Td1, Tb1-4}. If 400A≤I<500A, the correction value is 6, Tbx1=MAX{Td1, Tb1-6}. If I≥500A, the correction value is 8, Tbx1=MAX{Td1, Tb1-8}.

[0113] The unit of the above correction values ​​is Celsius.

[0114] Furthermore, a plurality of first temperature measuring points and a plurality of second temperature measuring points are provided in the battery pack. Figure 3 , Figure 3 Among them, NTC2, NTC3, NTC4, NTC5, NTC6, NTC7, NTC9, NTC11, NTC12, NTC13, and NTC14 are the first temperature measurement points, and NTC1, NTC8, and NTC10 are the second temperature measurement points.

[0115] The temperature of each first temperature measuring point can be corrected using the above method.

[0116] observe Figure 3 It can be known that the three second temperature measurement points are respectively located in the end areas and the middle area on both sides of the battery pack along the first direction. That is, in this embodiment, there are three temperature measurement areas distributed along the first direction of the battery pack, and the first direction is the arrangement direction of the battery cells in a battery cell of the battery pack, more specifically, the length direction of the battery pack. When correcting the above-mentioned first temperature measurement point, the temperature of the second temperature measurement point corresponding to the temperature measurement area where it is located is selected for correction. Further, the battery pack includes two battery cells, and the two battery cells are distributed along the second direction, and the three second temperature measurement points are distributed along the third direction, and the first direction, the second direction, and the third direction intersect with 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.

[0117] The embodiment of the present application also provides a temperature correction device for a battery pack, referring to Figure 4 , 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 used to obtain the temperature of a first temperature measuring point of the battery pack, and the first temperature measuring point is located at the outer shell of the corresponding battery cell in the battery pack. The second acquisition module 420 is used to obtain the temperature of a second temperature measuring point adjacent to the first temperature measuring point, and the second temperature measuring point is located at the pole and / or the busbar of the corresponding battery cell. The correction module 430 is used 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.

[0118] It should be noted that the information interaction, execution process and other contents between the above-mentioned modules are based on the same concept as the method embodiment of the present application, and are devices corresponding to the temperature correction method of the above-mentioned battery pack. All implementation methods in the above-mentioned method embodiment are applicable to the embodiments of the device. Its specific functions and technical effects can be found in the method embodiment part, which will not be repeated here.

[0119] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by 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.

[0120] Each functional unit and module in the embodiment can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit, and the above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of each functional unit and module are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the above-mentioned method embodiment, and will not be repeated here.

[0121] An embodiment of the present application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program that can be executed on the processor, and when the processor executes the computer program, the steps in the temperature correction method of the battery pack in any of the above embodiments are implemented.

[0122] The hardware entity of the computer device includes: a processor, a communication interface and a memory, wherein: the processor generally controls the overall operation of the computer device. The communication interface enables the computer device to communicate with other terminals or servers through a network. The memory is configured to store instructions and applications executable by the processor, and can also cache data to be processed or processed by the processor and various modules in the computer device (for example, image data, audio data, voice communication data and video communication data), which can be implemented through flash memory (FLASH) or random access memory (Random Access Memory, RAM). Data can be transmitted between the processor, the communication interface and the memory through a bus.

[0123] The computer readable storage medium may be transitory or non-transitory.

[0124] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps in the temperature correction method for a battery pack according to any of the above embodiments are implemented.

[0125] An embodiment of the present application further provides a computer program product, which includes a computer program or instructions. When the computer program or instructions are executed by a processor, the steps in the temperature correction method for a battery pack in any of the above embodiments are implemented.

[0126] The computer program product may be implemented in hardware, software or a combination thereof. In some embodiments, the computer program product is embodied as a computer storage medium, and in other embodiments, the computer program product is embodied as a software product, such as a software development kit (SDK).

[0127] The present application also provides a battery pack, referring to Figure 5-Figure 9 The battery pack includes: a box body 1, at least one battery cell 2, a current collector 3, a temperature measuring device 4, and at least one of a temperature correction device, a computer device, and a computer-readable storage medium as in any of the above embodiments.

[0128] At least one battery cell 2 is located in the housing 1, the battery cell 2 includes at least two battery cells 21, the arrangement direction of the at least two battery cells 21 of the battery cell 2 is a first direction, the battery cell 21 includes a shell 211, an electrode assembly located in the shell 211 and a pole 212 arranged in the shell 211, and the pole 212 is electrically connected to the electrode assembly. The current collector 3 is used to collect the electric energy of the battery cells 21. The temperature measuring device 4 includes at least one first temperature measuring device 41 and at least one second temperature measuring device 42, the first temperature measuring device 41 is arranged in contact with the first temperature measuring point, and the second temperature measuring device 42 is arranged in contact with the second temperature measuring point. The first temperature measuring point is located at the shell corresponding to the battery cell 21, and the second temperature measuring point is located at the pole 212 of the corresponding battery cell 21 and / or the corresponding current collector 3.

[0129] The specific structure of the box body 1 is not limited. Figure 5 The box body 1 of the battery pack can be roughly rectangular.

[0130] At least one battery cell 21 is disposed in the box body 1, referring to Figure 6 Each battery unit 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 a length direction or a width direction of the box body 1 .

[0131] The battery pack may include only one battery cell 2 or may include two or more battery cells 2. When the battery pack includes at least two battery cells 2, the at least two battery cells 2 are arranged along the second direction.

[0132] The second direction intersects the first direction. As an example, the second direction may be orthogonal to the first direction, such as 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 may be at any suitable angle to the first direction.

[0133] Reference Figure 6The battery cell 21 includes a housing 211, an electrode assembly located in the housing 211, and a pole 212 disposed on the housing 211. As an example, the electrode assembly includes a positive electrode sheet and a negative electrode sheet, and the pole 212 includes a positive pole 2121 and a negative pole 2122, and the positive pole 2121 and the negative pole 2122 are connected to the positive electrode sheet and the negative electrode sheet, respectively. The positive pole 2121 and the negative pole 2122 of the same battery cell 21 can be arranged at intervals along the second direction.

[0134] The current collector 3 is used to collect the electric energy of the battery cells 21. The specific structure of the current collector 3 is not limited, and the current collector 3 can be electrically connected to the poles 212 of the battery cells 21, so as to connect the battery cells 21 in series or in parallel.

[0135] As an example, see Figure 6 , Figure 8 and Fig. 9 A busbar 3 is provided between each two adjacent battery cells 21 in a battery unit 2 , and the busbar 3 is electrically connected to the poles 212 of the corresponding two adjacent battery cells 21 .

[0136] The busbar 3 may be an aluminum bar, a copper-aluminum bar or other devices with a conductive function, which is not limited. The busbar 3 may be a substantially plate-shaped structure and located on the top side of the corresponding battery cell 21 .

[0137] A busbar 3 is provided between each two adjacent battery cells 21 of the battery unit 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.

[0138] Taking the example of the busbar device 3 connecting two adjacent battery cells 21 in series, the busbar device 3 can be electrically connected to the positive electrode column 2121 of one of the battery cells 21 , and electrically connected to the negative electrode column 2122 of the other battery cell 21 .

[0139] As mentioned above, in some embodiments, the battery pack may include at least two battery cells 2, and at least two battery cells 2 may be connected in series and arranged along the second direction. In these embodiments, the battery pack includes a jumper device 6, and a jumper device 6 is provided between each two adjacent battery cells 2. The jumper device 6 may connect the two battery cells 2 in series or in parallel. Still taking the battery pack used for vehicle power supply as an example, the jumper device 6 may connect the two battery cells 2 in series.

[0140] Specifically, the jumper device 6 can be connected to the battery cell 21 on one end of one battery unit 2 along the first direction and the battery cell 21 on the end of the other battery unit 2, so as to realize the series connection or parallel connection of the two battery units 2. The specific structure of the jumper device 6 can refer to the current collector device 3, which will not be repeated here.

[0141] The temperature measuring device 4 may include a temperature measuring sensor represented by a thermistor. There are multiple temperature measuring devices 4 distributed at different positions of the battery pack. In actual operation, the working state of each battery cell 21 can be comprehensively evaluated based on the temperatures measured by multiple temperature measuring devices 4.

[0142] The temperature measuring device 4 of the embodiment of the present application includes at least one first temperature measuring device 41 and at least one second temperature measuring device 42. The first temperature measuring device 41 is arranged in contact with the first temperature measuring point, and the second temperature measuring device 42 is arranged in contact with the second temperature measuring point. That is, the first temperature measuring device 41 is arranged in contact with the housing 211 of the corresponding battery cell 21, and the second temperature measuring device 42 is arranged in contact with the pole 212 of the corresponding battery cell 21 and / or the corresponding busbar device 3.

[0143] It should be noted that the contact setting here specifically refers to a contact setting in a manner that the temperature measuring device 4 can detect the temperature at the position within the allowable error range. Taking the contact between the first temperature measuring component 41 and the shell 211 of the corresponding battery cell 21 as an example, the temperature measuring surface of the first temperature measuring component 41 can be directly in contact with the shell 211 of the battery cell 21, or it can be indirectly in contact with the shell 211 of the battery cell 21 (such as contacting the shell 211 via a silicone thermal pad, thermal adhesive or other thermal conductive structure), as long as the error between the temperature actually detected by the first temperature measuring component 41 and the actual temperature of the shell 211 of the battery cell 21 is within the allowable range (for example, the error is less than 3°C, 2°C, 1°C, 0.5°C, etc.).

[0144] The second temperature measuring member 42 may only contact the pole 212 of the corresponding battery cell 21, or only contact the busbar 3 electrically connected to the pole 212 of the corresponding battery cell 21, or may contact the pole 212 of the corresponding battery cell 21 and the busbar 3 electrically connected to the pole 212 at the same time, and there is no limitation on this. Similar to the first temperature measuring member 41, the second temperature measuring member 42 may directly contact the above-mentioned part, or may indirectly contact the above-mentioned part.

[0145] The structures of the first temperature measuring element 41 and the second temperature measuring element 42 can be the same, for example, the first temperature measuring element 41 and the second temperature measuring element 42 can be the same type of temperature sensors, and the difference is only that the positions of the two are different. Alternatively, the structures of the first temperature measuring element 41 and the second temperature measuring element 42 can also be different, which is not limited.

[0146] The first temperature measuring component 41 and the second temperature measuring component 42 can output the measured temperature data to the external control system, and 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 component 41 and the second temperature measuring component 42, and then adjust the charging and discharging strategy of the battery pack.

[0147] As an example, see Figure 8 and Fig. 9 The battery pack may include a circuit board 5, and the first temperature measuring element 41 and the second temperature measuring element 42 may be electrically connected to the circuit board 5. The circuit board 5 may be a flexible circuit board (FPC) or other types of circuit boards, which are not limited thereto. A connector 51 may be provided on the circuit board 5, and the connector 51 is used to connect 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, so as to transmit the temperature data measured by the first temperature measuring element 41 and the second temperature measuring element 42 to the temperature correction device 400.

[0148] More specifically, each battery cell 2 may be provided with a corresponding circuit board 5, and the circuit board 5 may be located on the top side of each battery cell 21 of the corresponding battery cell 2 and extend along the first direction. The positive pole 2121 and the negative pole 2122 of the battery cell 21 are arranged along the second direction, and a gap may be formed between the current collectors 3 corresponding to the positive pole 2121 and the negative pole 2122 of the same battery cell 21, and the circuit board 5 may be provided in the gap, and the two opposite sides of the circuit board 5 along the second direction may be connected to the corresponding current collector 3. That is, the circuit board 5 extends along the first direction and is provided on one side of the current collector 3 along the second direction (or, each current collector 3 is provided on the opposite sides of the circuit board 5 along the second direction).

[0149] 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.

[0150] The battery pack further includes at least one of the temperature correction device 400, a computer device, and a computer-readable storage medium as described in any of the above embodiments. 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, a processor of the computer device, and / or a processor for executing a 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.

[0151] In this embodiment, the first temperature measuring component 41 can measure the temperature of the outer shell 211 of the corresponding battery cell 21, and the second temperature measuring component 42 can measure the temperature of the corresponding dotted part. In this way, in the actual working process, the temperature correction method of any of the above embodiments can be used to obtain the corrected temperature of each first temperature measuring point, so as to more accurately judge the working status of each battery cell 21 in the battery pack, thereby improving the charging and discharging performance and safety of the battery pack.

[0152] In some embodiments, at least one second temperature measuring component 42 is located in an end area on one side of the box 1 along the first direction, at least one second temperature measuring component 42 is located in an end area on the other side of the box 1 along the first direction, and at least one second temperature measuring component 42 is located in a middle area of ​​the box 1 along the first direction.

[0153] It can be understood that the end area is relatively close to the end wall of the box body 1, and the heat exchange rate with the external environment is relatively large, while the heat exchange rate between the middle area and the external environment is relatively small. Therefore, there is a certain difference between the temperature of the live parts in the end area and the temperature of the live parts in the middle area. In this embodiment, at least one second temperature measuring component 42 is provided in each of these areas. This helps to more comprehensively measure the temperature of the live parts at various positions of the box body 1, further improve the accuracy of the judgment of the operating status of the battery cell 21, and thereby improve the charging and discharging performance and safety of the battery pack.

[0154] It should be noted that the end region here specifically refers to the region where a battery cell 21 at the end of the battery unit 2 along the first direction is located, that is, at least one of the pole 212 of a battery cell 21 at the end of the battery unit 2 along the first direction and the busbar 3 electrically connected to the pole 212 is in contact with the second temperature measuring member 42. The middle region refers to the region between the two end regions.

[0155] In some embodiments, the battery pack includes at least two battery cells 2, at least two battery cells 2 are arranged along the second direction, each second temperature measuring component 42 is arranged along the 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.

[0156] In this embodiment, the second temperature measuring component 42 is distributed along a third direction intersecting with both the first direction and the second direction. In this way, not only the temperature of the charged parts of the two end areas can be measured, but also the temperature of the charged parts of the diagonal areas on both sides can be measured, and the measurement is more comprehensive.

[0157] As an example, the third direction may be the diagonal direction of the box 1, or a direction close to the diagonal direction of the box 1, such as an angle of no more than 5°, no more than 10°, or no more than 15° with the diagonal direction of the box 1. It should be noted that the distribution of the second temperature measuring components 42 along the third direction specifically means that, assuming a coordinate system is constructed, the position coordinates of each second temperature measuring component 42 are fitted into a virtual line, and the extension direction of the virtual line is the third direction.

[0158] In some embodiments, the housing 211 includes a metal shell 2111 and an insulating film 2112, the electrode assembly is located in the metal shell 2111, and the pole 212 is disposed in the metal shell 2111. The insulating film 2112 is coated on the outside of the metal shell 2111, and the insulating film 2112 is formed with an escape opening 2112a, the metal shell 2111 is partially exposed in the escape opening 2112a, and the corresponding first temperature measuring member 41 is at least partially located in the escape opening 2112a to contact the metal shell 2111.

[0159] It is understood that the metal shell 2111 helps reduce the possibility of safety problems such as circuit breakage, combustion, and explosion of the battery cell 21. The metal shell 2111 can be made of metal materials such as stainless steel and aluminum alloy. Since the shells 211 of two adjacent battery cells 21 may come into contact, the metal shell 2111 is wrapped with an insulating film 2112.

[0160] The setting of the insulating film 2112 may have a certain impact on the conduction of heat. In this embodiment, an avoidance opening 2112a is set on the insulating film 2112, so that the first temperature measuring component 41 can be protected from the influence of the insulating film 2112, thereby improving its accuracy in measuring the temperature of the shell 211 of the battery cell 21.

[0161] In some embodiments, the battery cell 21 further includes an explosion-proof valve 213, which is disposed in the metal shell 2111 and located in the avoidance opening 2112a, so that the number of openings of the insulating film 2112 can be reduced and the insulation of the battery cell 21 can be improved. The specific structure of the explosion-proof valve 213 refers to the relevant technology in the field and will not be repeated here.

[0162] In some embodiments, the metal shell 2111 includes a main shell 2111a and an end cover 2111b, the end cover 2111b is covered on the main shell 2111a, the electrode assembly is located in the space enclosed by the end cover 2111b and the main shell 2111a, the pole 212 is arranged on the end cover 2111b, the insulating film 2112 spans the main shell 2111a and the end cover 2111b, and the avoidance port 2112a is located on the side of the end cover 2111b away from the main shell 2111a, corresponding to the first temperature measuring component 41 in contact with the end cover 2111b.

[0163] In this embodiment, the first temperature measuring member 41 contacts the end cover 2111b instead of the main shell 2111a, so that the gap between the main shells 2111a of two adjacent battery cells 21 can be reduced (no need to reserve space for the installation of the first temperature measuring member 41), making the arrangement of the battery cells 21 more compact and improving the energy density of the battery pack. In addition, it is also convenient to make an electrical connection between the first temperature measuring member 41 and an external control system.

[0164] In some embodiments, the corresponding second temperature measuring component 42 is in contact with the busbar component 3 .

[0165] It can be understood that the busbar device 3 needs to be electrically connected to the pole 212 of the corresponding battery cell 21, which will cause a certain degree of shielding to the pole 212. For this reason, in this embodiment, the second temperature measuring component 42 is in contact with the busbar device 3, thereby reducing the difficulty of arranging the second temperature measuring component 42 and facilitating the electrical connection between the second temperature measuring component 42 and the external control system.

[0166] 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 poles 212 of the corresponding two adjacent battery cells 21 . The voltage sampler 32 is electrically connected to the busbar body 31 . The corresponding second temperature measuring component 42 is in contact with the voltage sampler 32 .

[0167] In this embodiment, the second temperature measuring member 42 is in contact with the voltage sampler 32 , thereby further reducing the difficulty of assembly.

[0168] In this embodiment, the voltage sampler 32 may be a nickel sheet or other device with a conductive function, which is mainly used to measure the voltage signal of the busbar body 31 and transmit the voltage signal to an external control system.

[0169] As an example, the second temperature measuring component 42 can be connected to the nickel sheet by ultrasonic welding, and a thermal conductive colloid can be applied at the connection point. In this way, the contact stability between the second temperature measuring component 42 and the nickel sheet can be improved, and the accuracy of temperature measurement by the second temperature measuring component 42 can be improved.

[0170] In the above embodiment in which the circuit board 5 is provided, the voltage sampler 32 may extend along the second direction, and the voltage sampler 32 may include a first section in contact with the current collector 3 and a second section in contact with the circuit board 5 along the second direction, and the second temperature measuring member 42 may be located in the second section of the voltage sampler 32 and electrically connected to the circuit board 5. In this way, the electrical connection structure between the second temperature measuring member 42 and the circuit board 5 is further simplified, thereby further reducing the difficulty of assembly. Obviously, the location of the second temperature measuring member 42 is not limited thereto, and it may also be located in the first section of the voltage sampler 32.

[0171] It should be noted that, regardless of whether it is necessary to contact with the corresponding second temperature measuring component 42, the voltage sampler 32 should be provided on the busbar component 3. In other words, each busbar component 3 in the battery pack includes a busbar body 31 and a voltage sampler 32, but only a part of the voltage samplers 32 may contact with the second temperature measuring component 42. Compared with the voltage samplers 32 that are not in contact with the second temperature measuring component 42, the voltage samplers 32 that are in contact with the second temperature measuring component 42 may have a larger surface area (e.g., in the above embodiment, they may have a longer length along the second direction) to provide sufficient installation space for the second temperature measuring component 42.

[0172] In some embodiments, reference Fig.10 and Fig.11 The bus body 31 may have an avoidance gap 31a on one side along the first direction, and the voltage sampler 32 is connected to the other side of the bus body 31 along the first direction, and the corresponding first temperature measuring component 41 is at least partially located in the avoidance gap 31a to contact the shell 211 of the corresponding battery cell 21.

[0173] In this embodiment, the first temperature measuring component 41 and the voltage sampler 32 are respectively located on opposite sides of the busbar device 3 along the first direction. This facilitates the overall circuit layout of the first temperature measuring component 41, the voltage sampler 32 and the second temperature measuring component 42, and reduces the interference between the circuits of the above components.

[0174] In this embodiment, the specific shape of the avoidance gap 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 is formed with a avoidance gap 2112a. In these embodiments, the avoidance gap 31a can be formed at the position corresponding to the avoidance gap 2112a of the battery cell 21.

[0175] It should be noted that, regardless of whether the housing 211 of the corresponding battery cell 21 is in contact with the first temperature measuring member 41, the busbar body 31 of the busbar component 3 electrically connected to the pole 212 of the corresponding battery cell 21 may have an avoidance gap 31a. In other words, the busbar body 31 of each busbar component 3 of the battery pack has an avoidance gap 31a, but the first temperature measuring member 41 may be disposed in only a portion of the avoidance gaps 31a.

[0176] In some embodiments, reference Fig.11 and Fig.12The battery pack further includes a bracket 7, which is disposed on the side of the current collector 3 facing the battery cell 21 and connected to the current collector 3. The bracket 7 has a hollow portion 7a, which is located in the avoidance gap 31a. The first temperature measuring member 41 is fixedly connected to the bracket 7 and is at least partially located in the hollow portion 7a. In this way, the stability of the installation of the first temperature measuring member 41 can be improved, and the possibility of displacement of the first temperature measuring member 41 during actual use can be reduced.

[0177] In this embodiment, the first temperature measuring component 41 is fixed by means of the bracket 7, so that the installation stability of the first temperature measuring component 41 can be improved. As an example, the bracket 7 can extend along the second direction, and its two opposite ends along the second direction can be connected to a confluence component 3 respectively, so that the installation stability of the first temperature measuring component 41 is further improved.

[0178] In some embodiments, reference Figure 3 , Figure 8 and Fig. 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 the first direction and is disposed on one side of the current collector 3 along the second direction, and the second direction intersects the first direction. The avoidance notch 31a is located on one side of the current collector body 31 close to the circuit board 5. The first temperature measuring component 41, the second temperature measuring component 42 and the voltage sampler 32 are all electrically connected to the circuit board 5.

[0179] Figure 3 The figure shows the connection points of the temperature measuring device 4, the voltage sampler 32 and the circuit board 5 according to the embodiment of the present application. Specifically, Figure 3 Two circuit boards 5 corresponding to two battery cells 2 are shown. The two battery cells 2 are connected in series, and the battery cells 21 in the battery cells 2 are also connected in series. Points V1-V26 are the connection points between the voltage sampler 32 and the circuit board 5, and points NTC1-NTC14 are the connection points between the temperature measuring device 4 and the circuit board 5.

[0180] It can be seen that the arrangement adopted in this embodiment can simplify the circuit structure in the battery pack, save space in the battery pack, and thus help to improve the energy density of the battery pack. The specific arrangement of the circuit board 5 can refer to the description of the relevant position above, and will not be repeated here.

[0181] In some embodiments, a busbar device 3 is provided between each two adjacent battery cells 21 of the battery unit 2, and the busbar device 3 is electrically connected to the poles 212 of the corresponding two adjacent battery cells 21; the outer shell 211 of the corresponding battery cell 21, the pole 212 and the busbar device 3 electrically connected to the pole 212 are selectively in contact with the temperature measuring device 4.

[0182] In this embodiment, for a battery cell 21, if its housing 211 has been in contact with the first temperature measuring element 41, its pole 212 and the busbar 3 electrically connected to the pole 212 will no longer be in contact with the second temperature measuring element 42, and vice versa. In other words, for a battery cell 21, only one of the first temperature measuring element 41 or the second temperature measuring element 42 will be correspondingly provided. In this way, the total number of the first temperature measuring element 41 and the second temperature measuring element 42 will not exceed the total number of the battery cells 21, reducing the temperature measurement cost and data processing volume.

[0183] In some embodiments, in order to further reduce the temperature measurement cost and data processing volume, only the shell 211, the pole 212, and the busbar 3 electrically connected to the pole 212 of a portion of the battery cells 21 may selectively contact the temperature measuring device 4, while the shell 211, the pole 212, and the busbar 3 electrically connected to the pole 212 of another portion of the battery cells 21 do not contact the temperature measuring device 4. That is, the total number of the first temperature measuring components 41 and the second temperature measuring components 42 is less than the total number of the battery cells 21.

[0184] As an example, among every two adjacent battery cells 21, only the shell 211, the pole 212, and the busbar 3 electrically connected to the pole 212 of one of the battery cells 21 may selectively contact the temperature measuring device 4, while the shell 211, the pole 212, and the busbar 3 electrically connected to the pole 212 of the other battery cell 21 may not contact the temperature measuring device 4. In this way, both the temperature measurement accuracy and the temperature measurement cost can be taken into account.

[0185] Of course, in some embodiments, the outer shell 211, the pole 212 and multiple busbar components 3 electrically connected to the pole 212 of at least a portion of the battery cells 21 are in contact with the temperature measuring device 4, that is, at least a portion of the battery cells 21 are simultaneously provided with a first temperature measuring component 41 and a second temperature measuring component 42, thereby further improving the temperature measurement accuracy.

[0186] In some embodiments, the busbar device 3 connects two adjacent battery cells 21 in series, which helps to increase the operating voltage of the battery pack and the charge and discharge rate of the battery pack to meet relevant usage requirements.

[0187] In some embodiments, the battery pack includes at least two battery cells 2 and a jumper device 6, wherein a jumper device 6 is disposed between each two adjacent battery cells 2, and the jumper 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 and discharge rate of the battery pack.

[0188] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic representation of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0189] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for correcting the temperature of a battery pack, characterized in that: The method comprises: Acquire the temperature of a first temperature measurement point of a battery pack, where the first temperature measurement point is located at an outer shell of a corresponding battery cell in the battery pack; Acquiring the temperature of a second temperature measuring point adjacent to the first temperature measuring point, wherein the second temperature measuring point is located at a pole and / or a busbar of a corresponding battery cell in 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 according to 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. Correcting 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 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; or Correcting the temperature of the second temperature measuring point according to the ambient temperature in 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; or An average value or a weighted average value of the temperature at the first temperature measuring point and the temperature at the second temperature measuring point is used as the corrected temperature at the first temperature measuring point.

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

3. The method according to claim 2, characterized in that The number of the temperature measurement areas is at least three, and the temperature measurement areas are distributed along a first direction of the battery pack, where the first direction is an arrangement direction of the battery cells in a battery unit of the battery pack.

4. The method according to claim 3, characterized in that: The battery cells of the battery pack are distributed along a second direction, the second temperature measurement points corresponding to each of the temperature measurement areas are distributed along a third direction, and 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 claim 1, characterized in that The step of correcting the temperature of the second temperature measuring point according to the ambient temperature and / or the current value in the battery pack comprises: determining a correction value according to the current value, wherein the correction value is positively correlated with the current value in at least a partial range; The correction value is subtracted from the temperature of the second temperature measuring point to obtain the corrected temperature of the second temperature measuring point.

6. The method according to claim 5, characterized in that The step of correcting the temperature of the second temperature measuring point according to the ambient temperature and / or the current value in the battery pack comprises: Selecting a correction strategy according to the ambient temperature, wherein if the ambient temperature is less 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 according to the current value and the selected correction strategy, wherein the correction value is positively correlated with the current value in at least a partial range, and the correction value corresponding to the first correction strategy is smaller than the correction value corresponding to the second correction strategy; The correction value is subtracted from the temperature of the second temperature measuring point to obtain the corrected temperature of the second temperature measuring point.

7. The method according to claim 5 or 6, characterized in that: The correction value increases step by step as the current value increases.

8. A temperature correction device for a battery pack, characterized in that: The temperature correction device comprises: A first acquisition module, used to acquire the temperature of a first temperature measurement point of the battery pack, where the first temperature measurement point is located at an outer shell of a corresponding battery cell in the battery pack; A second acquisition module, used 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 a pole and / or a busbar corresponding to the battery cell; A correction module is used 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. Wherein, when the correction module corrects 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, it is specifically used to: 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; or Correcting the temperature of the second temperature measuring point according to the ambient temperature in 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; or An average value or a weighted average value of the temperature at the first temperature measuring point and the temperature at the second temperature measuring point is used as the corrected temperature at the first temperature measuring point.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program executable on the processor, wherein: When the processor executes the computer program, the steps in the temperature correction method of the battery pack according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps in the temperature correction method of the battery pack according to any one of claims 1 to 7 are implemented.

11. A battery pack, characterized in that: The battery pack comprises: Box; At least one battery unit is located in the box, the battery unit includes at least two battery cells, the arrangement direction of the at least two battery cells of the battery unit is a first direction, the battery cell includes a shell, an electrode assembly located in the shell and a pole arranged in the shell, and the pole is electrically connected to the electrode assembly; A converging device, used for converging the electric energy of the battery cells; A temperature measuring device, comprising at least one first temperature measuring element and at least one second temperature measuring element, wherein the first temperature measuring element is arranged in contact with a first temperature measuring point, and the second temperature measuring element is arranged in contact with a second temperature measuring point; and At least one of the temperature correction device for the battery pack according to claim 8, the computer device according to claim 9, and the computer-readable storage medium according to claim 10.

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