Battery pack and electric device

Abstract

A battery pack and an electric device. The battery pack comprises a case (1), a battery unit (2), a busbar component (3), and a plurality of temperature measuring components (4). At least one battery unit (2) is located inside the case (1). Each battery unit (2) comprises at least two battery cells (21). A busbar component (3) is disposed between every two adjacent battery cells (21) of a corresponding battery unit (2), and each busbar component (3) is electrically connected to terminal posts (212) of corresponding two adjacent battery cells (21). The plurality of temperature measuring components (4) are located inside the case (1); the number of temperature measuring components (4) is not less than one-half of the number of battery cells (21), but not more than two-thirds of the number of battery cells (21).

Description

Battery packs and electrical devices

[0001] Cross-references to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202421620311.3, filed on July 10, 2024, entitled “Battery Pack and Power Consumption Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This disclosure relates to the field of battery technology, specifically to a battery pack and an electrical device. Background Technology

[0004] Temperature is a crucial control parameter for batteries during operation, directly affecting battery safety and charging / discharging strategies. Therefore, temperature sampling plays a vital role in ensuring the normal operation of batteries.

[0005] In related technologies, temperature sensors, such as thermistors, are generally used for temperature sampling. The temperature sensors are set at temperature measurement points inside the battery pack, and these measurement points are usually set one-to-one with the individual battery cells inside the battery pack. This method of temperature measurement increases the cost of the battery pack. Summary of the Invention

[0006] In view of this, the present disclosure aims to provide a battery pack and power supply device that reduce the cost of the battery pack.

[0007] To achieve the above objectives, the technical solution of this disclosure embodiment is implemented as follows:

[0008] The first aspect of this disclosure provides a battery pack, comprising: a housing; at least one battery cell located within the housing, the battery cell comprising at least two individual battery cells arranged in a first direction, each individual battery cell comprising a housing, an electrode assembly located within the housing, and a terminal post disposed on the housing, the terminal post being electrically connected to the electrode assembly; a busbar device, wherein a busbar device is disposed between each pair of adjacent battery cells of the battery cell, the busbar device being electrically connected to the terminal post of each pair of adjacent battery cells; and a plurality of temperature sensing devices located within the housing, the number of temperature sensing devices being not less than 1 / 2 and not more than 2 / 3 of the number of battery cells.

[0009] In this embodiment, the number of temperature measuring devices is less than the number of battery cells. That is, the temperature measuring devices are not set up one-to-one with the battery cells. Instead, some battery cells share a single temperature measuring device. Specifically, in the area of ​​the housing corresponding to the battery cells, only one temperature measuring device is set up.

[0010] In this embodiment, both the accuracy and cost of temperature measurement can be balanced. Specifically, when the number of temperature measuring devices is not less than half the number of battery cells, it is possible to ensure that at least one temperature measuring device is deployed in the area where every two adjacent battery cells are located, so as to avoid the situation of missing temperature data in a large area (for example, there is no temperature measuring device in the area where more than three adjacent battery cells are located), thereby ensuring the accuracy of temperature measurement.

[0011] In some embodiments, the temperature sensing device contacts the casing of the corresponding battery cell, or the temperature sensing device contacts at least one of the terminals of the corresponding battery cell and the busbars electrically connected to the terminals.

[0012] Temperature measuring devices with the above configuration have higher accuracy, meaning that the accuracy of temperature measurement by a single temperature measuring device can be improved. This can, to some extent, compensate for the decrease in accuracy caused by a reduction in the number of temperature measuring devices.

[0013] Specifically, when the temperature sensing device is in contact with the casing of a battery cell, it measures the temperature of the casing. When the temperature sensing device is in contact with at least one of the terminals of the battery cell or the current-carrying assembly electrically connected to the terminals, it measures the temperature of the charged parts inside the battery pack. Generally speaking, the temperature of the battery cell casing can relatively accurately reflect the operating state of a specific battery cell, while the temperature of the charged parts can reflect the impact of current heating on the battery cell to some extent. Therefore, each of the above two methods of setting up temperature sensing devices has its advantages.

[0014] In some embodiments, the casing, terminal, and busbar electrically connected to the terminal of one of two adjacent battery cells are selectively in contact with the temperature sensing device.

[0015] In this embodiment, one of every two adjacent battery cells is provided with a temperature measuring device, and only one temperature measuring device is provided for each battery cell. In this way, while reducing the number of temperature measuring devices, the temperature measuring devices can be distributed relatively evenly at different positions of the box, so that the temperature measuring devices can obtain the temperature data of each battery cell more comprehensively, thereby balancing temperature measurement accuracy and cost.

[0016] In some embodiments, the housing includes: a metal housing, an electrode assembly located within the metal housing, and a pole disposed within the metal housing; an insulating film covering the outside of the metal housing, the insulating film forming a clearance opening, the metal housing partially exposed through the clearance opening, and a corresponding temperature sensing device at least partially located within the clearance opening to contact the metal housing.

[0017] Understandably, a metal casing helps reduce the likelihood of battery cells experiencing open circuits, combustion, or explosions. The metal casing can be made of materials such as stainless steel or aluminum alloy. Since the casings of adjacent battery cells may come into contact, an insulating film is wrapped around the outside of the metal casing.

[0018] The installation of an insulating film may have some impact on heat conduction. In this embodiment, an abutment is provided on the insulating film, which can protect the temperature measuring device from the influence of the insulating film and improve the accuracy of its measurement of the casing temperature of the battery cell.

[0019] In some embodiments, the metal housing includes: a main housing; an end cap disposed on the main housing; an electrode assembly located within the space enclosed by the end cap and the main housing; an electrode post disposed on the end cap; an insulating film spanning the main housing and the end cap; and a clearance opening located on the side of the end cap away from the main housing, corresponding to the contact between the temperature sensing device and the end cap.

[0020] In this embodiment, the temperature sensing device contacts the end cap rather than the main casing. This reduces the gap between the main casings of two adjacent battery cells, eliminating the need to reserve space for the temperature sensing device's installation. This allows for a more compact arrangement of the battery cells and improves the energy density of the battery pack. Furthermore, it facilitates the electrical connection between the temperature sensing device and an external control system.

[0021] In some embodiments, the busbar device includes: a busbar body, which is electrically connected to the terminals of two adjacent battery cells respectively; a voltage sampler, which is electrically connected to the busbar body, and a corresponding temperature measuring device is in contact with the voltage sampler.

[0022] It is understandable that the busbar device needs to be electrically connected to the terminal of the corresponding battery cell, which will cause some obstruction to the terminal. Therefore, in this embodiment, the temperature measuring device is in contact with the busbar device, thereby reducing the difficulty of laying out the temperature measuring device and facilitating the electrical connection between the temperature measuring device and the external control system.

[0023] In some embodiments, the busbar has a clearance notch on one side along the first direction, a voltage sampler is connected to the other side of the busbar along the first direction, and a corresponding temperature measuring device is at least partially located in the clearance notch to contact the casing of the corresponding battery cell.

[0024] In some embodiments, the battery pack includes at least one circuit board corresponding to at least one battery cell, the circuit board extending along a first direction and disposed on one side of the busbar device along a second direction, the second direction intersecting the first direction; an avoidance notch is located on the side of the busbar body close to the circuit board, and the temperature measuring device and voltage sampler are both electrically connected to the circuit board.

[0025] In some embodiments, at least one temperature measuring device is a first temperature measuring device that contacts the casing of the corresponding battery cell, and at least one temperature measuring device is a second temperature measuring device that contacts at least one of the terminal post of the corresponding battery cell and a busbar device electrically connected to the terminal post.

[0026] The battery pack in this embodiment is equipped with at least one first temperature measuring device and at least one second temperature measuring device. In this way, the outer shell temperature of the individual battery cells and the temperature of the charged parts of the battery pack can be provided simultaneously, thereby improving the accuracy of judging the working status of the individual battery cells and thus improving the charging and discharging performance and reliability of the battery pack.

[0027] In some embodiments, the busbar device connects two adjacent battery cells in series; and / or the battery pack includes at least two battery cells and a jumper device, wherein a jumper device is provided between every two adjacent battery cells, and the jumper device connects two adjacent battery cells in series.

[0028] In this embodiment, individual battery cells are connected in series, and / or battery units are connected in series, so that the battery pack can meet the power supply voltage requirements and can improve the charge and discharge rate of the battery pack to a certain extent.

[0029] A second aspect of this disclosure provides an electrical device including a battery pack from the first aspect of this disclosure.

[0030] The electrical device of the second aspect of the present disclosure has all the advantages of the battery pack of the first aspect of the present disclosure, which will not be repeated here. Attached Figure Description

[0031] Figure 1 is a schematic diagram of the structure of the battery pack according to an embodiment of the present disclosure;

[0032] Figure 2 is a schematic diagram of the structure of the housing and battery unit according to an embodiment of this disclosure;

[0033] Figure 3 is a schematic diagram of the structure of a single battery cell according to an embodiment of this disclosure;

[0034] Figure 4 is a schematic diagram of the top side structure of the bus device, flexible circuit board and temperature measuring device according to an embodiment of this disclosure;

[0035] Figure 5 is a schematic diagram of the bottom structure of the busbar device, flexible circuit board and temperature measuring device according to an embodiment of this disclosure;

[0036] Figure 6 is a schematic diagram of the structure of the bus device according to an embodiment of this disclosure;

[0037] Figure 7 is an enlarged schematic diagram of part A in Figure 4;

[0038] Figure 8 is a schematic diagram of the structure of the bracket according to an embodiment of the present disclosure;

[0039] Figure 9 is a schematic diagram of the connection points of the temperature measuring device, voltage sampler and circuit board in an embodiment of this disclosure.

[0040] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Battery unit; 21. Battery cell; 211. Outer shell; 2111. Metal shell; 2111a. Main shell; 2111b. End cap; 2112. Insulating film; 2112a. Clearance opening; 212. Terminal post; 2121. Positive terminal post; 2122. Negative terminal post; 213. Explosion-proof valve; 3. Busbar device; 31. Busbar body; 31a. Clearance notch; 32. Voltage sampler; 4. Temperature measuring device; 41. First temperature measuring device; 42. Second temperature measuring device; 5. Circuit board; 51. Connector; 6. Jumper device; 7. Bracket; 7a. Cutout portion. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this disclosure.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure; the terms “comprising” and “having” and any variations thereof in this disclosure are intended to cover non-exclusive inclusion.

[0043] In the description of the embodiments of this disclosure, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly defined.

[0044] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0045] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, D and / or F can represent: D existing alone, D and F existing simultaneously, and F existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following associated objects are in an "or" relationship.

[0046] In the description of the embodiments of this disclosure, the technical terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated, or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this disclosure.

[0047] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0048] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0049] In the description of this disclosure, the orientations or positional relationships such as "first direction," "second direction," "third direction," and "altitude direction" are based on the orientations or positional relationships shown in the accompanying drawings. Specifically, "first direction" refers to the direction indicated by arrow L1 in the drawings, "second direction" refers to the direction indicated by arrow L2 in the drawings, and "third direction" refers to the direction indicated by arrow L3 in the drawings. It should be understood that these orientational terms are for the convenience of describing this disclosure and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this disclosure.

[0050] With the government's strong promotion of new energy vehicles, these vehicles have ushered in a golden opportunity for development. The reliability and stability of automobiles have always been of utmost concern. Therefore, improving the reliability of new energy vehicles will be one of the key factors determining their rapid popularization. As the main component of the battery pack in new energy vehicles, improving the reliability of the battery cell is a crucial way to enhance the overall reliability of the vehicle.

[0051] A battery cell typically includes multiple individual cells, which are enclosed within a frame welded together from end plates and side plates. During the assembly of the battery cell, the end plates at both ends exert a certain preload on the battery to improve and enhance its cycle performance.

[0052] The battery cell includes a casing, an electrode assembly disposed within the casing, and terminals disposed within the casing, with the terminals electrically connected to the electrode assembly. The electrode assembly consists of a positive electrode plate, a negative electrode plate, and a separator, and the terminals include a positive terminal and a negative terminal, which are electrically connected to the positive electrode plate and the negative electrode plate, respectively.

[0053] A single battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates. The positive electrode plate consists of a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, while the uncoated current collector protrudes beyond the coated one. These uncoated current collectors, stacked together, form the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode plate consists of a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, while the uncoated current collector protrudes beyond the coated one. These uncoated current collectors, stacked together, form the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon or silicon, etc. The separator can be made of PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly can be a wound structure or a stacked structure.

[0054] The battery pack also includes an integrated busbar (Cells Contact System, CCS), which is mainly composed of a flexible printed circuit (FPC), busbars (such as copper-aluminum busbars), voltage samplers, and temperature measuring devices. The busbars, voltage samplers, and temperature measuring devices are all connected to the flexible printed circuit board.

[0055] The busbar is electrically connected to the terminals of two adjacent battery cells, thereby connecting the two adjacent battery cells in series or in parallel.

[0056] Voltage samplers typically include a nickel plate that contacts the terminals of a bus device and / or a battery cell and is electrically connected to a flexible circuit board to achieve voltage acquisition.

[0057] Temperature sensing devices include temperature sensors, such as thermistors (Negative Temperature Coefficient thermistors), which are located at sampling points within the battery pack.

[0058] In related technologies, temperature measuring devices are usually set up one-to-one with individual battery cells. However, with the advancement of technology, the number of individual battery cells in a battery pack is increasing and their arrangement is becoming more compact. For example, there is a type of battery pack with a large charge-discharge rate. Specifically, the ratio between the energy value and the power value of the battery pack is less than or equal to 1 / 3. In this case, the cost of continuing to use the above-mentioned temperature measuring device setup is high.

[0059] Therefore, a battery pack according to an embodiment of this disclosure is proposed. The battery pack of this embodiment includes: a housing, at least one battery cell, a busbar device, and multiple temperature sensing devices. At least one battery cell is located within the housing, and the battery cell includes at least two individual battery cells arranged in a first direction. Each battery cell includes a casing, an electrode assembly located within the casing, and a terminal post disposed on the casing, the terminal post being electrically connected to the electrode assembly. A busbar device is disposed between each pair of adjacent battery cells of the corresponding battery cell, and the busbar device is electrically connected to the terminal post of each pair of adjacent battery cells. Multiple temperature sensing devices are disposed within the housing, the number of temperature sensing devices being less than the number of battery cells.

[0060] In this embodiment, the number of temperature measuring devices is less than the number of battery cells. That is, the temperature measuring devices are not set up one-to-one with the battery cells. At least some battery cells will share a temperature measuring device, which can reduce the cost of the battery pack.

[0061] According to some embodiments of this disclosure, referring to Figures 1-5, the battery pack includes a housing 1, at least one battery cell 2, a busbar device 3, and multiple temperature measuring devices 4. At least one battery cell 2 is located within the housing 1. The battery cell 2 includes at least two individual battery cells 21, arranged in a first direction. Each battery cell 21 includes a housing 211, an electrode assembly (not shown) located within the housing 211, and a terminal post 212 disposed on the housing 211, electrically connected to the electrode assembly. A busbar device 3 is disposed between each pair of adjacent battery cells 21 of the corresponding battery cell 2, and the busbar device 3 is electrically connected to the terminal post 212 of each pair of adjacent battery cells 21. Multiple temperature measuring devices 4 are located within the housing 1, and the number of temperature measuring devices 4 is less than the number of battery cells 21.

[0062] The specific structure of the housing 1 is not limited. As an example, referring to Figure 1, the housing 1 of the battery pack can be roughly rectangular.

[0063] At least one battery cell 21 is disposed inside the housing 1. Referring to FIG2, each battery cell 2 includes at least two battery cells 21, and the arrangement direction of the at least two battery cells 21 is a first direction, which may be specifically the length direction or the width direction of the housing 1.

[0064] The battery pack may include only one battery cell 2, or it may include two or more battery cells 2. In the case where the battery pack includes at least two battery cells 2, the at least two battery cells 2 are arranged along the second direction.

[0065] The second direction intersects the first direction. As an example, the second direction can be orthogonal to the first direction, such as when the first direction is the length direction of the box 1 and the second direction is the width direction of the box 1; or, the second direction can also form any suitable angle with the first direction.

[0066] Referring to Figure 3, the battery cell 21 includes a housing 211, an electrode assembly located within the housing 211, and terminal posts 212 disposed on the housing 211. As an example, the electrode assembly includes a positive electrode and a negative electrode, and the terminal posts 212 include a positive terminal post 2121 and a negative terminal post 2122, which are respectively connected to the positive and negative electrode. The positive terminal posts 2121 and negative terminal posts 2122 of the same battery cell 21 can be spaced apart along the aforementioned second direction.

[0067] Referring to Figures 2, 4 and 5, a current-combining device 3 is provided between each pair of adjacent battery cells 21 in a battery cell 2. The current-combining device 3 is electrically connected to the terminal post 212 of the corresponding two adjacent battery cells 21.

[0068] The busbar 3 can be an aluminum busbar, a copper-aluminum busbar, or other conductive devices, and there are no restrictions on this. The busbar 3 can be generally plate-shaped and located on the top side of the corresponding battery cell 21.

[0069] A busbar 3 is provided between each pair of adjacent battery cells 21 in battery cell 2. The busbar 3 can connect two adjacent battery cells 21 in parallel or in series, without limitation. Taking a battery pack used for powering a vehicle as an example, the battery pack needs to have a sufficiently high operating voltage, so the busbar 3 usually connects two adjacent battery cells 21 in series.

[0070] Taking the combination device 3 connecting two adjacent battery cells 21 in series as an example, the combination device 3 can be electrically connected to the positive terminal 2121 of one of the battery cells 21 and to the negative terminal 2122 of the other battery cell 21.

[0071] As mentioned above, in some embodiments, the battery pack may include at least two battery cells 2, and the at least two battery cells 2 may be connected in series and arranged along a second direction. In these embodiments, the battery pack includes a bridging device 6, which is provided between every two adjacent battery cells 2. The bridging device 6 can connect two battery cells 2 in series or in parallel. Taking a battery pack used for powering a vehicle as an example, the bridging device 6 can connect two battery cells 2 in series.

[0072] Specifically, the jumper device 6 can be connected to a battery cell 21 on one side of one battery cell 2 along the first direction, and to a battery cell 21 on the same side of another battery cell 2, thereby connecting the two battery cells 2 in series or in parallel. The specific structure of the jumper device 6 can be referred to the busbar device 3, and will not be described in detail here.

[0073] Temperature sensing device 4 may include a temperature sensor, such as a thermistor. There are multiple temperature sensing devices 4, which are distributed in different locations in the battery pack. In actual operation, the working status of each battery cell 21 can be comprehensively evaluated based on the temperature measured by multiple temperature sensing devices 4.

[0074] The temperature measuring device 4 can output the temperature data it measures to the external control system. The external control system can determine the working status of each battery cell 21 in the battery pack based on the temperature data measured by the temperature measuring device 4, and then adjust the charging and discharging strategy of the battery pack.

[0075] As an example, referring to Figures 4 and 5, the battery pack may include a circuit board 5, to which a temperature sensing device may be electrically connected. The circuit board 5 may be a flexible printed circuit board (FPC) or other types of circuit boards, without limitation. A connector 51 may be provided on the circuit board 5 for connecting to an external control system, thereby transmitting the temperature sensing device 4 and the measured temperature data to the external control system.

[0076] More specifically, each battery cell 2 can be provided with a corresponding circuit board 5. The circuit board 5 can be located on the top side of each battery cell 21 of the corresponding battery cell 2 and extends along the first direction. The positive terminal 2121 and negative terminal 2122 of the battery cell 21 are arranged along the second direction. The current collector 3 corresponding to the positive terminal 2121 and negative terminal 2122 of the same battery cell 21 can form a gap, and the circuit board 5 can be disposed in the gap. The two opposite sides of the circuit board 5 along the second direction can be connected to the corresponding current collector 3. That is, the circuit board 5 extends along the first direction and is disposed on one side of the current collector 3 along the second direction (or, each current collector 3 is disposed on the opposite sides of the circuit board 5 along the second direction).

[0077] It should be noted that the battery pack may not include the circuit board 5, and the temperature sensing device 4 may be connected to the external control system in other ways, such as through wires.

[0078] In this embodiment, the number of temperature measuring devices 4 is less than the number of battery cells 21. That is, the temperature measuring devices 4 are not arranged in a one-to-one correspondence with the battery cells 21. Instead, some battery cells 21 share a single temperature measuring device 4. Specifically, in the area of ​​the housing 1 corresponding to the portion of battery cells 21, only one temperature measuring device is provided. This reduces the cost of the battery pack.

[0079] It should be noted that the number of battery cells 21 mentioned here refers to the total number of battery cells 21 in the battery pack, not the number of battery cells 21 in a specific battery cell 2. In some embodiments described below, the temperature measuring device 4 may include a first temperature measuring device 41 and a second temperature measuring device 42, and the number of temperature measuring devices mentioned here is the total number of the first temperature measuring device 41 and the second temperature measuring device 42.

[0080] Specifically, in this embodiment, the number of temperature measuring devices 4 is not less than 1 / 2 of the number of battery cells 21 and does not exceed 2 / 3 of the number of battery cells 21. The numerical range here includes the endpoint values.

[0081] In this embodiment, both the accuracy and cost of temperature measurement can be balanced. Specifically, when the number of temperature measuring devices 4 is not less than half the number of battery cells 21, it is possible to ensure that at least one temperature measuring device 4 is deployed in the area where every two adjacent battery cells 21 are located, so as to avoid the situation of missing temperature data in a large area (for example, there is no temperature measuring device 4 in the area where more than three adjacent battery cells 21 are located), thereby ensuring the accuracy of temperature measurement.

[0082] In some embodiments, the temperature measuring device 4 contacts the outer casing 211 of the corresponding battery cell 21, or the temperature measuring device contacts at least one of the terminal post 212 of the corresponding battery cell 21 and the busbar device 3 electrically connected to the terminal post 212.

[0083] The temperature measuring device 4 with the above configuration has high temperature measurement accuracy, that is, it can improve the temperature measurement accuracy of a single temperature measuring device. In this way, it can compensate to a certain extent for the decrease in temperature measurement accuracy caused by the reduction in the number of temperature measuring devices.

[0084] It should be noted that the contact here specifically refers to contact in a manner that allows the temperature sensing device 4 to detect the temperature at that location within the allowable error range. Taking the contact between the temperature sensing device 4 and the outer casing 211 of the corresponding battery cell 21 as an example, the temperature sensing surface of the temperature sensing device 4 can directly contact the outer casing 211 of the battery cell 21, or it can indirectly contact the outer casing 211 of the battery cell 21 (such as through a silicone thermal pad, thermal adhesive, or other thermally conductive structure), as long as the error between the actual temperature detected by the temperature sensing device 4 and the actual temperature of the outer casing 211 of the battery cell 21 is within the allowable range (e.g., the error is less than 3℃, 2℃, 1℃, 0.5℃, etc.).

[0085] When the temperature measuring device 4 comes into contact with the outer casing 211 of the battery cell 21, it measures the temperature of the outer casing 211 of the battery cell 21. In some parts of the following text, this temperature measuring device 4 that comes into contact with the outer casing 211 of the battery cell 21 is referred to as the first temperature measuring device 41.

[0086] When the temperature measuring device 4 is in contact with at least one of the terminal post 212 of the battery cell 21 and the current-connecting assembly electrically connected to the terminal post 212, the temperature of the charged part inside the battery pack is measured. In some parts below, this temperature measuring device 4 that is in contact with at least one of the terminal post 212 of the battery cell 21 and the current-connecting assembly electrically connected to the terminal post 212 is referred to as the second temperature measuring device 42.

[0087] Generally speaking, the temperature of the casing 211 of the battery cell 21 can relatively accurately reflect the operating state of a specific battery cell 21, while the temperature of the charged part can reflect the influence of the current heating effect on the battery cell 21 to a certain extent. Therefore, the first temperature measuring device 41 and the second temperature measuring device 42 each have their advantages.

[0088] Those skilled in the art can choose to set the temperature measuring device 4 as either the first temperature measuring device 41 or the second temperature measuring device 42 according to actual usage requirements. For example, each temperature measuring device 4 can be the first temperature measuring device 41, or each temperature measuring device 4 can be the second temperature measuring device 42, or some temperature measuring devices 4 can be the first temperature measuring device 41 and other temperature measuring devices 4 can be the second temperature measuring device 42.

[0089] In some embodiments, the casing 211, the terminal post 212, and the busbar 3 electrically connected to the terminal post 212 of one of the two adjacent battery cells 21 are selectively in contact with the temperature measuring device.

[0090] In this embodiment, one of every two adjacent battery cells 21 is provided with a temperature measuring device 4, and only one temperature measuring device 4 is provided for each battery cell 21. In this way, while reducing the number of temperature measuring devices 4, the temperature measuring devices 4 can be distributed relatively evenly at different positions of the housing 1, so that the temperature measuring devices 4 can obtain the temperature data of each battery cell 21 more comprehensively, thereby balancing temperature measurement accuracy and cost.

[0091] In some embodiments, the housing 211 includes a metal housing 2111 and an insulating film 2112. The electrode assembly is located inside the metal housing 2111, and the electrode post 212 is disposed on the metal housing 2111. The insulating film 2112 covers the outside of the metal housing 2111, and the insulating film 2112 forms a clearance opening 2112a. The metal housing 2111 is partially exposed in the clearance opening 2112a, and the corresponding temperature sensing device is at least partially located in the clearance opening 2112a to contact the metal housing 2111. As mentioned above, the temperature sensing device 4 here is the first temperature sensing device 41.

[0092] It is understandable that the metal casing 2111 helps reduce the possibility of problems such as open circuit, combustion, and explosion in the battery cell 21. The metal casing 2111 can be made of metal materials such as stainless steel and aluminum alloy. Since the casings 211 of two adjacent battery cells 21 may come into contact, the metal casing 2111 is wrapped with an insulating film 2112.

[0093] The setting of the insulating film 2112 may have a certain impact on heat conduction. In this embodiment, an avoidance opening 2112a is provided on the insulating film 2112, so that the first temperature measuring device 41 can be protected from the influence of the insulating film 2112, thereby improving the accuracy of its temperature measurement of the outer shell 211 of the battery cell 21.

[0094] In some embodiments, the battery cell 21 further includes an explosion-proof valve 213, which is disposed in the metal housing 2111 and located within the clearance opening 2112a. This reduces the number of openings in the insulating film 2112 and improves the insulation of the battery cell 21. The specific structure of the explosion-proof valve 213 is described in accordance with relevant technologies in the art and will not be repeated here.

[0095] In some embodiments, the metal housing 2111 includes a main housing 2111a and an end cap 2111b. The end cap 2111b covers the main housing 2111a. The electrode assembly is located within the space enclosed by the end cap 2111b and the main housing 2111a. The electrode post 212 is disposed on the end cap 2111b. The insulating film 2112 spans across the main housing 2111a and the end cap 2111b. The clearance opening 2112a is located on the side of the end cap 2111b away from the main housing 2111a, corresponding to the contact between the temperature sensing device and the end cap 2111b.

[0096] In this embodiment, the first temperature sensing device 41 contacts the end cap 2111b, rather than the main casing 2111a. This reduces the gap between the main casings 2111a of two adjacent battery cells 21, eliminating the need to reserve space for the installation of the first temperature sensing device 41. This allows for a more compact arrangement of the battery cells 21, improving the energy density of the battery pack. Furthermore, it facilitates the electrical connection between the first temperature sensing device 41 and the external control system.

[0097] In some embodiments, the corresponding temperature measuring device 4 is in contact with the busbar device 3.

[0098] As mentioned above, the temperature measuring device 4 here is the second temperature measuring device 42. It can be understood that the busbar device 3 needs to be electrically connected to the terminal 212 of the corresponding battery cell 21, which will cause some obstruction to the terminal 212. Therefore, in this embodiment, the second temperature measuring device 42 is in contact with the busbar device 3, thereby reducing the difficulty of laying out the second temperature measuring device 42 and facilitating the electrical connection between the second temperature measuring device 42 and the external control system.

[0099] In some embodiments, the busbar device 3 specifically includes a busbar body 31 and a voltage sampler 32. The busbar body 31 is electrically connected to the terminals 212 of two adjacent battery cells 21, and the voltage sampler 32 is electrically connected to the busbar body 31. A corresponding temperature measuring device is in contact with the voltage sampler 32. As mentioned above, the temperature measuring device here is the second temperature measuring device 42.

[0100] In this embodiment, the second temperature measuring device 42 is in contact with the voltage sampler 32, thereby further reducing its assembly difficulty.

[0101] In this embodiment, the voltage sampler 32 can be a nickel plate or other conductive device, which is mainly used to measure the voltage signal of the bus body 31 and transmit the voltage signal to the external control system.

[0102] As an example, the second temperature measuring device 42 can be connected to the nickel sheet by ultrasonic welding, and thermally conductive colloid can be applied at the connection point. This can improve the stability of the contact between the second temperature measuring device 42 and the nickel sheet, and improve the accuracy of temperature measurement by the second temperature measuring device 42.

[0103] In the embodiment described above with circuit board 5, voltage sampler 32 can extend along a second direction. Voltage sampler 32 along the second direction may include a first segment contacting bus device 3 and a second segment contacting circuit board 5. Second temperature sensing device 42 can be located in the second segment of voltage sampler 32 and electrically connected to circuit board 5. This further simplifies the electrical connection structure between second temperature sensing device 42 and circuit board 5, thereby further reducing its assembly difficulty. Obviously, the location of second temperature sensing device 42 is not limited to this; it can also be located in the first segment of voltage sampler 32.

[0104] It should be noted that a voltage sampler 32 should be provided on the busbar 3 regardless of whether it needs to contact the second temperature measuring device 42. In other words, each busbar 3 in the battery pack includes a busbar body 31 and a voltage sampler 32, but only a portion of the voltage sampler 32 may contact the second temperature measuring device 42. Compared to the voltage sampler 32 that does not contact the second temperature measuring device 42, the voltage sampler 32 that does contact the second temperature measuring device 42 can have a larger surface area (e.g., in the above embodiment, it can have a longer length along the second direction) to provide sufficient installation space for the second temperature measuring device 42.

[0105] In some embodiments, referring to Figures 6 and 7, the busbar 31 may have a clearance notch 31a on one side along the first direction, while the voltage sampler 32 is connected to the other side of the busbar 31 along the first direction. The corresponding temperature sensing device is at least partially located in the clearance notch 31a to contact the housing 211 of the corresponding battery cell 21. As mentioned above, the temperature sensing device here is the first temperature sensing device 41.

[0106] In this embodiment, the first temperature measuring device 41 and the voltage sampler 32 are located on opposite sides of the bus device 3 along the first direction. This facilitates the overall circuit layout of the temperature measuring device 4 and the voltage sampler 32 and reduces interference between the circuits of the above components.

[0107] In this embodiment, the specific shape of the clearance notch 31a is not limited. In some embodiments described above, the outer shell 211 of the battery cell 21 includes an insulating film 2112, and the insulating film 2112 has a clearance opening 2112a. In these embodiments, the clearance notch 31a can be formed at the position of the clearance opening 2112a corresponding to the battery cell 21.

[0108] It should be noted that, regardless of whether the outer casing 211 of the corresponding battery cell 21 is in contact with the first temperature sensing device 41, the busbar body 31 of the busbar device 3 electrically connected to the terminal post 212 of the corresponding battery cell 21 can have a clearance notch 31a. In other words, the busbar body 31 of each busbar device 3 in the battery pack has a clearance notch 31a, but the first temperature sensing device 41 can be provided in only a portion of the clearance notches 31a.

[0109] In some embodiments, referring to Figures 7 and 8, the battery pack further includes a bracket 7, which is disposed on the side of the busbar 3 facing the battery cell 21 and connected to the busbar 3. The bracket 7 has a cutout portion 7a located within an avoidance notch 31a. The first temperature sensing device 41 is fixedly connected to the bracket 7 and is at least partially located within the cutout portion 7a. This improves the stability of the installation of the first temperature sensing device 41 and reduces the possibility of displacement of the first temperature sensing device 41 during actual use.

[0110] In this embodiment, the first temperature measuring device 41 is fixed by means of the bracket 7, which can improve the installation stability of the first temperature measuring device 41. As an example, the bracket 7 can extend along the second direction, and its opposite ends along the second direction can be connected to a bus device 3 respectively, thus further improving the installation stability of the first temperature measuring device 41.

[0111] In some embodiments, referring to Figures 4, 5, and 9, the battery pack further includes at least one circuit board 5 corresponding to at least one battery cell 2. The circuit board 5 extends along a first direction and is disposed on one side of the busbar 3 along a second direction, which intersects the first direction. An avoidance notch 31a is located on the side of the busbar body 31 near the circuit board 5, and both the temperature measuring device and the voltage sampler 32 are electrically connected to the circuit board 5.

[0112] In some embodiments, at least one temperature measuring device 4 is a first temperature measuring device 41 that contacts the outer casing 211 of the corresponding battery cell 21, and at least one temperature measuring device 4 is a second temperature measuring device 42 that contacts at least one of the terminal post 212 of the corresponding battery cell 21 and the busbar 3 electrically connected to the terminal post 212.

[0113] As mentioned above, the first temperature measuring device 41 can measure the temperature of the casing 211 of the battery cell 21, and the second temperature measuring device 42 can measure the temperature of the charged parts inside the battery pack. This disclosure has found that there is a certain difference between the temperature of the casing 211 of the battery cell 21 and the temperature of the charged parts inside the battery pack.

[0114] The aforementioned temperature differences are particularly pronounced when the battery pack has a high charge / discharge rate. The charge / discharge rate refers to the ratio between the battery pack's energy value and its power value. A higher charge / discharge rate means that the current during battery pack operation may be higher (e.g., greater than 150A, 300A, 400A, or even 500A). The current-induced thermal effect increases with the current value, leading to a greater temperature difference between the casing 211 of the battery cell 21 and the charged parts. Specifically, when the battery pack's charge / discharge rate is high, and more specifically, when the ratio of the battery pack's energy value to its power value is less than or equal to 1 / 3, it is difficult to accurately determine the operating state of the battery cell 21 by measuring only the temperature of its casing 211 or only the temperature of the charged parts of the battery pack.

[0115] Therefore, the battery pack of this embodiment is provided with at least one first temperature measuring device 41 and at least one second temperature measuring device 42. In this way, the temperature of the outer shell 211 of the battery cell 21 and the temperature of the charged part of the battery pack can be provided simultaneously, thereby improving the accuracy of judging the working state of the battery cell 21, and thus improving the charging and discharging performance and reliability of the battery pack.

[0116] In some embodiments, at least one second temperature measuring device 42 is located in one end region of the housing 1 along the first direction, at least one second temperature measuring device 42 is located in the other end region of the housing 1 along the first direction, and at least one second temperature measuring device 42 is located in the middle region of the housing 1 along the first direction.

[0117] It is understood that the end region, which is relatively close to the end wall of the housing 1, has a relatively large heat exchange with the external environment, while the middle region has a relatively small heat exchange with the external environment. Therefore, there is a certain difference between the temperature of the charged part in the end region and the temperature of the charged part in the middle region. In this embodiment, at least one second temperature measuring device 42 is provided in each of these regions. This helps to more comprehensively measure the temperature of the charged part at each position of the housing 1, further improve the accuracy of judging the operating status of the battery cell 21, and thus improve the charging and discharging performance and reliability of the battery pack.

[0118] It should be noted that the end region here specifically refers to the region where a single battery cell 21 is located at the end of the battery cell 2 along the first direction. That is, at least one of the terminal post 212 of the single battery cell 21 at the end of the battery cell 2 along the first direction and the current collector 3 electrically connected to the terminal post 212 is in contact with the second temperature measuring device 42. The middle region refers to the region between the two end regions.

[0119] In some embodiments, the battery pack includes at least two battery cells 2, which are arranged along a second direction, and each second temperature measuring device 42 is arranged along a third direction. The first direction, the second direction, and the third direction intersect each other, and the first direction, the second direction, and the third direction are all perpendicular to the height direction of the battery pack.

[0120] In this embodiment, the second temperature measuring device 42 is distributed along a third direction that intersects both the first and second directions. In this way, it can not only measure the temperature of the charged parts in the two end regions, but also measure the temperature of the charged parts in the diagonal regions on both sides, making the measurement more comprehensive.

[0121] As an example, the third direction can be the diagonal direction of the housing 1, or a direction close to the diagonal of the housing 1, such as an angle between the diagonal of the housing 1 and the diagonal not exceeding 5°, 10°, or 15°. It should be noted that the distribution of the second temperature measuring device 42 along the third direction specifically means that, assuming a coordinate system is constructed, the position coordinates of each second temperature measuring device 42 are fitted to a virtual line, and the extension direction of this virtual line is the third direction.

[0122] In some embodiments, the busbar 3 connects two adjacent battery cells 21 in series. This helps to increase the operating voltage of the battery pack and improve the charge / discharge rate of the battery pack, meeting relevant usage requirements.

[0123] In some embodiments, the battery pack includes at least two battery cells 2 and a bridging device 6, wherein a bridging device 6 is provided between every two adjacent battery cells 2, and the bridging device 6 connects the corresponding two adjacent battery cells 2 in series. This helps to further increase the operating voltage of the battery pack and improve the charge / discharge rate of the battery pack.

[0124] Embodiments of this disclosure also provide an electrical device comprising the battery pack described in any of the foregoing embodiments. The electrical device of this disclosure possesses all the advantages of the battery pack described above, which will not be repeated here.

[0125] The battery pack in one or more of the embodiments described above will be described in more detail below with reference to a specific embodiment.

[0126] Referring to Figures 1-9, the battery pack includes a housing 1, two battery cells 2, a busbar 3, a circuit board 5, and multiple temperature measuring devices 4. The ratio of the energy value to the power value of the battery pack is less than or equal to 1 / 3.

[0127] The housing 1 is generally rectangular. Each battery unit 2 includes multiple battery cells 21 arranged along a first direction. Two battery units 2 are arranged along a second direction, and the number of battery cells 21 in the two battery units 2 is the same (in the illustrated embodiment, each of the two battery units 2 has 13 battery cells 21). The first direction is the length direction of the housing 1, and the second direction is the width direction of the housing 1.

[0128] The battery cell 21 includes a housing 211, an electrode assembly located within the housing 211, and terminal posts 212 disposed on the housing 211. The electrode assembly includes a positive electrode plate and a negative electrode plate, and the terminal posts 212 include a positive terminal post 2121 and a negative terminal post 2122. The positive terminal post 2121 and the negative terminal post 2122 are respectively connected to the positive electrode plate and the negative electrode plate, and the positive terminal post 2121 and the negative terminal post 2122 of the same battery cell 21 are distributed along the aforementioned second direction.

[0129] The current collector 3 is disposed on the top side of the battery cell 21. The current collector 3 is disposed between two adjacent battery cells 21 in the battery cell 2. The current collector 3 is electrically connected to the terminals 212 of the two adjacent battery cells 21 respectively. Specifically, the current collector 3 is electrically connected to the positive terminal 2121 of one battery cell 21 and to the negative terminal 2122 of the other battery cell 21, thereby connecting the two adjacent battery cells 21 in series.

[0130] For the same battery cell 21, the current collector 3 electrically connected to its positive terminal 2121 and the current collector 3 electrically connected to its negative terminal 2122 are spaced apart along the second direction. Thus, the multiple current collectors 3 corresponding to each battery cell 2 will be divided into two rows spaced apart along the second direction. The circuit board 5 corresponding to the battery cell 2 is disposed in the interval between the two rows of current collectors 3; that is, the circuit board 5 is located on the top side of the battery cell 21 and on one side of the current collectors 3 along the second direction. A connector 51 is provided on the circuit board 5, which is used to transmit the temperature data measured by the temperature measuring device 4 to an external control system.

[0131] The battery pack also includes a bridging device 6, which connects two adjacent battery cells 2 in series. Specifically, the bridging device 6 is connected to the positive terminal 2121 of a battery cell 21 at the end of one of the battery cells 2 along the first direction, and to the negative terminal 2122 of a battery cell 21 at the end of the other battery cell 2 along the first direction, thereby connecting the two battery cells 2 in series.

[0132] Multiple temperature measuring devices 4 are installed inside the housing 1. In this embodiment, the number of temperature measuring devices 4 is less than the number of battery cells 21, thereby reducing the cost of the battery pack.

[0133] The temperature measuring device includes at least one first temperature measuring device 41 and at least one second temperature measuring device 42, both of which include a thermistor. The first temperature measuring device 41 is in contact with the outer casing 211 of the corresponding battery cell 21, and the second temperature measuring device 42 is in contact with the terminal 212 of the corresponding battery cell 21 and / or a device electrically connected to the terminal 212. In this way, the temperature of the outer casing 211 and the temperature of the charged part of the battery cell 21 can be measured simultaneously. With these two temperatures, the operating status of the battery cell 21 can be judged more accurately, thereby improving the operational reliability and charge / discharge performance of the battery pack.

[0134] Specifically, the first temperature sensing device 41 contacts the outer casing 211 of the battery cell 21. The outer casing 211 of the battery cell 21 includes a metal shell 2111 and an insulating film 2112, with the electrode assembly located inside the metal shell 2111. The metal shell 2111 includes a main shell 2111a and an end cap 2111b, with the end cap 2111b covering the main shell 2111a. The electrode assembly is located within the space enclosed by the end cap 2111b and the main shell 2111a. The electrode post 212 is disposed on the end cap 2111b.

[0135] An insulating film 2112 covers the outside of the metal housing 2111. The insulating film 2112 has a clearance opening 2112a, through which the metal housing 2111 is partially exposed. The first temperature sensing device 41 is at least partially located within the clearance opening 2112a to contact the metal housing 2111. Specifically, the clearance opening 2112a is located on the side of the end cap 2111b opposite to the main housing 2111a, corresponding to the contact between the first temperature sensing device 41 and the end cap 2111b.

[0136] The battery pack includes a bracket 7 corresponding to the first temperature sensing device 41. The bracket 7 is located between the current collector 3 and the battery cell 21. The current collector 3 includes a current collector body 31 with a clearance notch 31a. The bracket 7 has a hollow portion 7a located within the clearance notch 31a, and in a projection plane perpendicular to the height direction, the hollow portion 7a at least partially overlaps with the clearance opening 2112a on the insulating film 2112. The first temperature sensing device 41 is fixedly connected to the bracket 7, and at least a portion of it is located within the hollow portion 7a, thereby enabling contact with the end cap 2111b of the battery cell 21 via the hollow portion 7a and the clearance opening 2112a.

[0137] The second temperature measuring device 42 is in contact with the busbar device 3. The busbar device 3 includes a busbar body 31 and a voltage sampler 32. The busbar body 31 is electrically connected to the terminals 212 of two adjacent battery cells 21 respectively. The voltage sampler 32 is electrically connected to the busbar body 31, and the second temperature measuring device 42 is in contact with the voltage sampler 32.

[0138] The voltage sampler 32 includes a first section that contacts the busbar body 31 and a second section that contacts the circuit board 5. The second temperature measuring device 42 is located in the second section of the voltage sampler 32. Specifically, the voltage sampler 32 includes a nickel sheet, and the second temperature measuring device 42 is ultrasonically welded to the nickel sheet, with thermally conductive adhesive applied to the weld joint.

[0139] The aforementioned clearance notch 31a is located on one side of the busbar body 31 along the first direction, while the voltage sampler 32 is located on the other side of the busbar body 31 along the first direction. The clearance notch 31a is located on the side of the busbar body 31 closest to the circuit board 5, and the voltage sampler 32 extends towards the circuit board 5 along the second direction. The first temperature measuring device 41, the second temperature measuring device 42, and the voltage sampler 32 are all electrically connected to the circuit board 5. This arrangement simplifies the circuit structure within the battery pack, facilitates assembly, and saves space.

[0140] At least one second temperature measuring device 42 is provided in the end areas on both sides of the first direction and in the middle area of ​​the first direction. Each second temperature measuring device 42 is distributed along a third direction, which is approximately the diagonal direction of the box 1. For example, the angle between the third direction and the diagonal direction of the box 1 does not exceed 10°, 15° or 20°.

[0141] Except for the battery cells 21 located at the end of the battery cell 2 along the first direction (mainly considering that the end area needs to be equipped with a second temperature measuring device), in every two adjacent battery cells 21, the outer casing 211, the terminal post 212, and the current collector 3 electrically connected to the terminal post 212 of one battery cell 21 are selectively in contact with the temperature measuring device, while the outer casing 211, the terminal post 212, and the current collector 3 electrically connected to the terminal post 212 of the other battery cell 21 are not in contact with the temperature measuring device.

[0142] More specifically, referring to Figure 9, in this embodiment, each battery unit 2 includes 13 battery cells 21, and two battery units 2 are provided with a total of 26 battery cells 21. The 26 battery cells 21 are connected in series, and the 26 battery cells are numbered 1 to 26 along the current flow direction. The first temperature measuring device 41 is in contact with the outer shell 211 of battery cells 3, 5, 7, 9, 11, 13, 15, 19, 21, 23, and 25. The corresponding points of the 11 first temperature measuring devices 41 in Figure 9 are NTC2, NTC3, NTC4, NTC5, NTC6, NTC7, NTC9, NTC11, NTC12, NTC13, and NTC14, respectively. The second temperature measuring device 42 is in contact with the terminal 212 of battery cells 21 of No. 1, No. 14 and No. 17 and / or the bus device 3 electrically connected to the terminal 212. The corresponding points of the above three second temperature measuring devices 42 in Figure 9 are NTC1, NTC8 and NTC10, respectively.

[0143] In the description of this disclosure, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this disclosure. In this disclosure, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine different embodiments or examples described in this disclosure, as well as features of different embodiments or examples, without contradiction.

[0144] The above are merely preferred embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A battery pack, comprising: Box; At least one battery cell is located inside the housing. The battery cell includes at least two individual battery cells, and the arrangement direction of the at least two individual battery cells is a first direction. Each individual battery cell includes a housing, an electrode assembly located inside the housing, and a terminal post disposed on the housing. The terminal post is electrically connected to the electrode assembly. A current-combining device is provided between each two adjacent battery cells of the battery unit, and the current-combining device is electrically connected to the terminals of the corresponding two adjacent battery cells. Multiple temperature measuring devices are located inside the enclosure, and the number of temperature measuring devices is not less than 1 / 2 and not more than 2 / 3 of the number of battery cells.

2. The battery pack according to claim 1, wherein, The temperature measuring device is in contact with the outer casing of the corresponding battery cell, or the temperature measuring device is in contact with at least one of the terminals of the corresponding battery cell and the busbar device electrically connected to the terminals.

3. The battery pack according to claim 2, wherein, In each pair of adjacent battery cells, the casing, terminal, and busbar electrically connected to the terminal of one of the battery cells are selectively in contact with the temperature sensing device.

4. The battery pack according to any one of claims 1-3, wherein, The outer casing includes: A metal housing, wherein the electrode assembly is located within the metal housing, and the electrode post is disposed within the metal housing; An insulating film covers the outside of the metal housing, the insulating film having a clearance opening, the metal housing being partially exposed through the clearance opening, and the temperature sensing device being at least partially located within the clearance opening to contact the metal housing.

5. The battery pack according to claim 4, wherein, The metal casing includes: Main shell; An end cap is provided on the main housing. The electrode assembly is located within the space enclosed by the end cap and the main housing. The electrode post is disposed on the end cap. The insulating film spans the main housing and the end cap. The clearance opening is located on the side of the end cap away from the main housing, corresponding to the contact between the temperature measuring device and the end cap.

6. The battery pack according to any one of claims 1-5, wherein, The bus device includes: The busbar body is electrically connected to the terminals of the two adjacent battery cells respectively; The voltage sampler is electrically connected to the bus body, and the temperature measuring device is in contact with the voltage sampler.

7. The battery pack according to claim 6, wherein, The busbar has a clearance notch on one side along the first direction, and the voltage sampler is connected to the other side of the busbar along the first direction. The temperature measuring device is at least partially located in the clearance notch to contact the casing of the corresponding battery cell.

8. The battery pack according to claim 7, wherein, The battery pack includes at least one circuit board corresponding to the at least one battery cell, the circuit board extending along a first direction and disposed on one side of the busbar device along a second direction, the second direction intersecting the first direction; The clearance is located on the side of the busbar body closer to the circuit board, and the temperature measuring device and the voltage sampler are both electrically connected to the circuit board.

9. The battery pack according to any one of claims 1-8, wherein, At least one of the temperature measuring devices is a first temperature measuring device that contacts the outer casing of the corresponding battery cell, and at least one of the temperature measuring devices is a second temperature measuring device that contacts at least one of the terminal post of the corresponding battery cell and a busbar device electrically connected to the terminal post.

10. The battery pack according to any one of claims 1-9, wherein, The busbar device connects two adjacent battery cells in series; and / or The battery pack includes at least two battery cells and a jumper device. The jumper device is provided between every two adjacent battery cells, and the jumper device connects the corresponding two adjacent battery cells in series.

11. An electrical device comprising a battery pack according to any one of claims 1-10.

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