Battery pack and electric device

Abstract

Embodiments of the present disclosure provide a battery pack and an electric device. The battery pack comprises a case, a battery unit, current collecting devices, and temperature measurement devices. Each temperature measurement device comprises at least one first temperature measurement member and at least one second temperature measurement member, the first temperature measurement member is arranged to be in contact with a casing of a corresponding battery cell, and the second temperature measurement member is arranged to be in contact with a pole of the corresponding battery cell and / or the corresponding current collecting device, wherein the at least one second temperature measurement member is located in an end region on one side of the case in a first direction, the at least one second temperature measurement member is located in an end region on the other side of the case in the first direction, and the at least one second temperature measurement member is located in a middle region of the case in the first direction.

Description

Battery packs and electrical devices

[0001] Cross-reference to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202421620488.3, ​​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] New energy batteries are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with batteries are already widely used. In addition, batteries are being used more and more in the field of energy storage.

[0005] Temperature is a crucial control parameter for batteries during operation, affecting their charging and discharging strategies. Therefore, temperature sampling plays a vital role in determining whether a battery can function properly.

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

[0007] In view of this, the present disclosure aims to provide a battery pack and power supply device that improves the accuracy of judging the working state of individual battery cells, thereby improving the charging and discharging performance and reliability of the battery pack.

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

[0009] The first aspect of this disclosure provides a battery pack, comprising: a housing; at least one battery cell located within the housing, the battery cell comprising at least two individual battery cells arranged in a first direction, each individual battery cell comprising a housing, an electrode assembly located within the housing, and a terminal post disposed on the housing, the terminal post being electrically connected to the electrode assembly; a busbar device for busing the electrical energy of the individual battery cells; and a temperature measuring device comprising at least one first temperature measuring element and at least one second temperature measuring element, the first temperature measuring element being in contact with the housing of the corresponding individual battery cell, and the second temperature measuring element being in contact with the terminal post of the corresponding individual battery cell and / or the corresponding busbar device; wherein at least one second temperature measuring element is located in one end region of the housing along the first direction, at least one second temperature measuring element is located in another end region of the housing along the first direction, and at least one second temperature measuring element is located in the middle region of the housing along the first direction.

[0010] The battery pack in this embodiment includes at least one first temperature sensor and at least one second temperature sensor. The first temperature sensor contacts the casing of the individual battery cells, thereby measuring the casing temperature of the individual cells. The second temperature sensor contacts at least one of the terminals of the corresponding battery cells and a current-carrying device electrically connected to the terminals, thereby measuring the temperature of the charged portion of the battery pack. Thus, both the casing temperature of the individual battery cells and the temperature of the charged portion of the battery pack can be provided simultaneously, improving the accuracy of determining the operating state of the individual battery cells, and consequently enhancing the charging and discharging performance and reliability of the battery pack.

[0011] Furthermore, it can be understood that the end region, which is relatively close to the end wall of the housing, has a relatively large heat exchange with the external environment, while the middle region has a relatively small heat exchange with the external environment. Therefore, there is a certain difference between the temperature of the charged part in the end region and the temperature of the charged part in the middle region. In this embodiment, at least one second temperature measuring element is provided in each of these regions. This helps to more comprehensively measure the temperature of the charged part at various locations in the housing, further improving the accuracy of judging the operating status of the battery cell, and thus improving the charging and discharging performance and reliability of the battery pack.

[0012] In some embodiments, the battery pack includes at least two battery cells arranged along a second direction, and each second temperature sensor 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.

[0013] In this embodiment, the second temperature measuring element is distributed along a third direction that intersects both the first and second directions. In this way, not only can the temperature of the charged parts in the two end regions be measured, but also the temperature of the charged parts in the diagonal regions on both sides can be measured, making the measurement more comprehensive.

[0014] In some embodiments, the housing includes: a metal housing, an electrode assembly located inside the metal housing, and a pole disposed on 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 in the clearance opening, and the corresponding first temperature sensing element being at least partially located within the clearance opening to contact the metal housing.

[0015] It is understandable that a metal casing helps reduce the possibility of safety issues such as open circuits, combustion, and explosions in individual battery cells. The metal casing can be specifically made of metal materials such as stainless steel or aluminum alloy. Since the casings of two adjacent battery cells may come into contact, an insulating film is wrapped around the outside of the metal casing. The insulating film may have some impact on heat conduction; however, in this embodiment, a clearance opening is provided on the insulating film. This allows the first temperature sensing element to be protected from the influence of the insulating film, improving the accuracy of its measurement of the battery cell casing temperature.

[0016] 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 first temperature measuring element and the end cap.

[0017] In this embodiment, the first temperature sensing element 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 installation of the first temperature sensing element), allowing for a more compact arrangement of the battery cells and improving the energy density of the battery pack. Furthermore, it facilitates the electrical connection between the first temperature sensing element and the external control system.

[0018] In some embodiments, the second temperature sensor is configured to contact the corresponding busbar device.

[0019] It is understood 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 second temperature measuring element is made to contact the busbar device, thereby reducing the difficulty of laying out the second temperature measuring element and facilitating the electrical connection between the second temperature measuring element and the external control system.

[0020] In some embodiments, the busbar device includes: a busbar body, which is electrically connected to the terminals of two adjacent battery cells respectively; and a voltage sampler, which is electrically connected to the busbar body and is disposed in contact with the second temperature measuring element.

[0021] In this embodiment, the second temperature measuring element is positioned in contact with the voltage sampler, thereby further reducing its assembly difficulty.

[0022] In some embodiments, the busbar has a clearance notch on one side along the first direction, and a voltage sampler is connected to the other side of the busbar along the first direction. The corresponding first temperature measuring element is at least partially located in the clearance notch to contact the casing of the corresponding battery cell.

[0023] In this embodiment, the first temperature measuring element and the voltage sampler are located on opposite sides of the bus device along the first direction. This facilitates the overall circuit layout of the first temperature measuring element, the voltage sampler, and the second temperature measuring element, and reduces interference between the circuits of the above components.

[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 first temperature measuring element, the second temperature measuring element and the voltage sampler are all electrically connected to the circuit board.

[0025] The configuration method adopted in this embodiment can simplify the circuit structure inside the battery pack and save space inside the battery pack, thereby helping to improve the energy density of the battery pack.

[0026] In some embodiments, a busbar device is provided between each pair of adjacent battery cells, and the busbar device is electrically connected to the terminals of the corresponding two adjacent battery cells; the casing, terminals, and busbar device electrically connected to the terminals of the corresponding battery cell are selectively in contact with the temperature measuring device.

[0027] In this embodiment, for a single battery cell, if its outer casing has already come into contact with the first temperature sensing element, then its terminals and the current-connecting assembly electrically connected to the terminals will not come into contact with the second temperature sensing element, and vice versa. In other words, for a single battery cell, it will only have one of the first or second temperature sensing elements. Thus, the total number of the first and second temperature sensing elements will not exceed the total number of battery cells, reducing temperature measurement costs and data processing volume.

[0028] In some embodiments, the busbar 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.

[0029] 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.

[0030] A second aspect of this disclosure provides an electrical device including a battery pack from the first aspect of this disclosure.

[0031] 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

[0032] Figure 1 is a schematic diagram of the battery pack housing structure according to an embodiment of this disclosure;

[0033] Figure 2 is a schematic diagram of the structure of the housing and battery unit according to an embodiment of this disclosure;

[0034] Figure 3 is a schematic diagram of the structure of a single battery cell according to an embodiment of this disclosure;

[0035] 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;

[0036] 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;

[0037] Figure 6 is a schematic diagram of the structure of the bus device according to an embodiment of this disclosure;

[0038] Figure 7 is an enlarged schematic diagram of part A in Figure 4;

[0039] Figure 8 is a schematic diagram of the structure of the bracket according to an embodiment of the present disclosure;

[0040] 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.

[0041] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Battery unit; 21. Battery cell; 211. Outer shell; 2111. Metal casing; 2111a. Main shell; 2111b. End cap; 2112. Insulating film; 2112a. Clearance opening; 212. Terminal post; 2121. Positive terminal post; 2122. Negative terminal post; 213. Explosion-proof valve; 3. Busbar device; 31. Busbar body; 31a. Clearance notch; 32. Voltage sampler; 4. Temperature measuring device; 41. First temperature measuring element; 42. Second temperature measuring element; 5. Circuit board; 51. Connector; 6. Jumper device; 7. Bracket; 7a. Cutout portion. Detailed Implementation

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] With the development of new energy vehicle technology, higher requirements are being placed on the reliability of new energy vehicles. As the main component of the battery pack in new energy vehicles, improving the reliability of the battery cell is an important way to improve the overall reliability of new energy vehicles.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] Temperature sensing devices include temperature sensors, such as thermistors (Negative Temperature Coefficient thermistors), which are located at sampling points within the battery pack.

[0059] Temperature data measured by temperature sensing devices is an important control parameter for batteries during operation. In order to improve the reliability of battery packs, it is desirable that the temperature data measured by temperature sensing devices can accurately provide early warning of the working status of individual battery cells.

[0060] In related technologies, temperature measuring devices typically contact the casing of a battery cell to measure its temperature. However, this disclosure has found that there is a certain difference between the casing temperature of a battery cell and the temperature of the charged parts within the battery pack. These charged parts mainly include the electrode assemblies, terminals, and busbars electrically connected to the terminals of the battery cell.

[0061] The aforementioned temperature differences are particularly pronounced when the battery pack has a high charge / discharge rate. The charge / discharge rate is the ratio between the energy value and the power value of the battery pack. A higher charge / discharge rate means that the current during the operation of the battery pack may be higher (e.g., it may be greater than 150A, or greater than 300A, or greater than 400A, or even greater than 500A). The current thermal effect will increase with the increase of the current value, which in turn leads to an increase in the temperature difference between the casing of the battery cell and the charged parts.

[0062] Therefore, when the charge / discharge rate of the battery pack is relatively high, or more specifically, when the ratio of the energy value to the power value of the battery pack is less than or equal to 1 / 3, it is difficult to accurately determine the working state of the battery cell by only measuring the temperature of the battery cell's casing.

[0063] Therefore, a battery pack according to an embodiment of this disclosure is proposed. The battery pack according to an embodiment of this disclosure includes: a housing, at least one battery cell, a current collector, and a temperature measuring device. 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. The current collector is used to combine the electrical energy of the battery cells. The temperature measuring device includes at least one first temperature measuring element and at least one second temperature measuring element. The first temperature measuring element is in contact with the casing of the corresponding battery cell, and the second temperature measuring element is in contact with the terminal post of the corresponding battery cell and / or the corresponding current collector. At least one second temperature measuring element is located in one end region of the housing along the first direction, at least one second temperature measuring element is located in another end region of the housing along the first direction, and at least one second temperature measuring element is located in the middle region of the housing along the first direction.

[0064] The battery pack in this embodiment is equipped with at least one first temperature measuring element and at least one second temperature measuring element. The first temperature measuring element is in contact with the casing of the individual battery cells, thereby measuring the casing temperature of the individual battery cells. The second temperature measuring element is in contact with the terminal post and / or the corresponding busbar of the individual battery cells, thereby measuring the temperature of the charged parts of the battery pack. In this way, both the casing 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 operating status of the individual battery cells, and thus improving the charging and discharging performance and reliability of the battery pack.

[0065] Furthermore, it can be understood that the end region, which is relatively close to the end wall of the housing, has a relatively large heat exchange with the external environment, while the middle region has a relatively small heat exchange with the external environment. Therefore, there is a certain difference between the temperature of the charged part in the end region and the temperature of the charged part in the middle region. In this embodiment, at least one second temperature measuring element is provided in each of these regions. This helps to more comprehensively measure the temperature of the charged part at various locations in the housing, further improve the accuracy of judging the operating status of the battery cell, and thus improve the charging and discharging performance and reliability of the battery pack.

[0066] As an example, the ratio of the energy value to the power value of the battery pack in this embodiment is less than or equal to 1 / 3.

[0067] 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 a temperature measuring device 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 located within the housing 211, and a terminal post 212 disposed on the housing 211. The terminal post 212 is electrically connected to the electrode assembly. The busbar device 3 is used to combine the electrical energy of the battery cell 21. The temperature measuring device 4 includes at least one first temperature measuring element 41 and at least one second temperature measuring element 42. The first temperature measuring element 41 is in contact with the housing 211 of the corresponding battery cell 21, and the second temperature measuring element 42 is in contact with the terminal post 212 of the corresponding battery cell 21 and / or the corresponding busbar device 3.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] The current collector 3 is used to combine the electrical energy of the battery cell 21. The specific structure of the current collector 3 is not limited, and it can be electrically connected to the terminal 212 of the battery cell 21, thereby connecting the battery cells 21 in series or in parallel.

[0074] As an example, 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, and the current-combining device 3 is electrically connected to the terminal post 212 of the corresponding two adjacent battery cells 21.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] The temperature measuring device 4 of this embodiment includes at least one first temperature measuring element 41 and at least one second temperature measuring element 42. The first temperature measuring element 41 is disposed in contact with the outer casing 211 of the corresponding battery cell 21, and the second temperature measuring element 42 is disposed in contact with the terminal post 212 of the corresponding battery cell 21 and / or the corresponding busbar 3.

[0082] It should be noted that the contact setting here specifically refers to a contact setting in which the temperature measuring device 4 can detect the temperature at that location within the allowable error range. Taking the contact between the first temperature measuring element 41 and the outer casing 211 of the corresponding battery cell 21 as an example, the temperature measuring surface of the first temperature measuring element 41 can directly contact the outer casing 211 of the battery cell 21, or indirectly contact the outer casing 211 of the battery cell 21 (such as through a silicone thermal pad, thermal adhesive, or other thermally conductive structure), as long as the error between the actual temperature detected by the first temperature measuring element 41 and the actual temperature of the outer casing 211 of the battery cell 21 is within the allowable range (e.g., the error is less than 3℃, 2℃, 1℃, 0.5℃, etc.).

[0083] The second temperature sensing element 42 may contact only the terminal 212 of the corresponding battery cell 21, or only the busbar 3 electrically connected to the terminal 212 of the corresponding battery cell 21, or simultaneously contact both the terminal 212 of the corresponding battery cell 21 and the busbar 3 electrically connected to the terminal 212; there are no restrictions on this. Similar to the first temperature sensing element 41, the second temperature sensing element 42 may directly contact the aforementioned parts, or indirectly contact the aforementioned parts.

[0084] The first temperature measuring element 41 and the second temperature measuring element 42 can have the same structure. For example, the first temperature measuring element 41 and the second temperature measuring element 42 can be the same type of temperature sensor, with the only difference being their different positions. Alternatively, the first temperature measuring element 41 and the second temperature measuring element 42 can also have different structures, and there is no restriction on this.

[0085] The first temperature measuring element 41 and the second temperature measuring element 42 can output the temperature data they measure to the external control system. The external control system can determine the working status of each battery cell 21 in the battery pack based on the temperature data measured by the first temperature measuring element 41 and the second temperature measuring element 42, and then adjust the charging and discharging strategy of the battery pack, etc.

[0086] As an example, referring to Figures 4 and 5, the battery pack may include a circuit board 5, and a first temperature sensor 41 and a second temperature sensor 42 may be electrically connected to the circuit board 5. The circuit board 5 may be a flexible printed circuit board (FPC) or other types of circuit boards, without limitation. A connector 51 may be provided on the circuit board 5 for connecting to an external control system, thereby transmitting the temperature data measured by the first temperature sensor 41 and the second temperature sensor 42 to the external control system.

[0087] 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).

[0088] 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 external control system in other ways, such as through wires.

[0089] In this embodiment, the first temperature measuring element 41 can measure the temperature of the outer casing 211 of the corresponding battery cell 21, and the second temperature measuring element 42 can measure the temperature of the corresponding charged part. In this way, during actual operation, the external control system can combine the temperature data measured by the first temperature measuring element 41 and the second temperature measuring element 42 to more accurately determine the working status of each battery cell 21 in the battery pack, thereby improving the charging and discharging performance and reliability of the battery pack.

[0090] Furthermore, at least one second temperature measuring element 42 is located in one end region of the housing 1 along the first direction, at least one second temperature measuring element 42 is located in the other end region of the housing 1 along the first direction, and at least one second temperature measuring element 42 is located in the middle region of the housing 1 along the first direction.

[0091] It is understood that the end region, which is relatively close to the end wall of the housing 1, has a relatively large heat exchange with the external environment, while the middle region has a relatively small heat exchange with the external environment. Therefore, there is a certain difference between the temperature of the charged part in the end region and the temperature of the charged part in the middle region. In this embodiment, at least one second temperature measuring element 42 is provided in each of these regions. This helps to more comprehensively measure the temperature of the charged part at various locations of the housing 1, further improve the accuracy of judging the operating status of the battery cell 21, and thus improve the charging and discharging performance and reliability of the battery pack.

[0092] It should be noted that the end region here specifically refers to the region where a single battery cell 21 is located at the end of the battery cell 2 along the first direction. That is, at least one of the terminal post 212 of the single battery cell 21 at the end of the battery cell 2 along the first direction and the current collector 3 electrically connected to the terminal post 212 is in contact with the second temperature measuring element 42. The middle region refers to the region between the two end regions.

[0093] In some embodiments, the battery pack includes at least two battery cells 2, which are arranged along a second direction, and each second temperature measuring element 42 is arranged along a third direction. The first direction, the second direction, and the third direction intersect each other, and the first direction, the second direction, and the third direction are all perpendicular to the height direction of the battery pack.

[0094] In this embodiment, the second temperature measuring element 42 is distributed along a third direction that intersects both the first and second directions. In this way, not only can the temperature of the charged parts in the two end regions be measured, but also the temperature of the charged parts in the diagonal regions on both sides can be measured, making the measurement more comprehensive.

[0095] As an example, the third direction can be the diagonal direction of the housing 1, or a direction close to the diagonal of the housing 1, such as an angle between the diagonal of the housing 1 and the diagonal not exceeding 5°, 10°, or 15°. It should be noted that the distribution of the second temperature measuring element 42 along the third direction specifically means that, assuming a coordinate system is constructed, the position coordinates of each second temperature measuring element 42 are fitted into a virtual line, and the extension direction of this virtual line is the third direction.

[0096] In some embodiments, the housing 211 includes a metal housing 2111 and an insulating film 2112. The electrode assembly is located inside the metal housing 2111, and the electrode post 212 is disposed on the metal housing 2111. The insulating film 2112 covers the outside of the metal housing 2111 and has a clearance opening 2112a. The metal housing 2111 is partially exposed in the clearance opening 2112a, and the first temperature sensing element 41 is at least partially located inside the clearance opening 2112a to contact the metal housing 2111.

[0097] It is understandable that the metal casing 2111 helps reduce the possibility of open circuits, combustion, explosion, etc. 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.

[0098] The installation of the insulating film 2112 may have a certain impact on heat conduction. In this embodiment, an avoidance opening 2112a is provided on the insulating film 2112, so that the first temperature measuring element 41 can be protected from the influence of the insulating film 2112, thereby improving the accuracy of its temperature measurement of the outer casing 211 of the battery cell 21.

[0099] 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.

[0100] In some embodiments, the metal housing 2111 includes a main housing 2111a and an end cap 2111b. The end cap 2111b covers the main housing 2111a. The electrode assembly is located within the space enclosed by the end cap 2111b and the main housing 2111a. The electrode post 212 is disposed on the end cap 2111b. The insulating film 2112 spans across the main housing 2111a and the end cap 2111b. The clearance opening 2112a is located on the side of the end cap 2111b away from the main housing 2111a, corresponding to the contact between the first temperature measuring element 41 and the end cap 2111b.

[0101] In this embodiment, the first temperature sensing element 41 contacts the end cap 2111b instead of the main casing 2111a. This reduces the gap between the main casings 2111a of two adjacent battery cells 21 (eliminating the need to reserve space for the installation of the first temperature sensing element 41), making the arrangement of the battery cells 21 more compact and improving the energy density of the battery pack. Furthermore, it facilitates the electrical connection between the first temperature sensing element 41 and the external control system.

[0102] In some embodiments, the second temperature measuring element 42 contacts the busbar device 3.

[0103] It is understood that the current collector 3 needs to be electrically connected to the terminal 212 of the corresponding battery cell 21, which will cause some obstruction to the terminal 212. Therefore, in this embodiment, the second temperature measuring element 42 is made to contact the current collector 3, thereby reducing the difficulty of laying out the second temperature measuring element 42 and facilitating the electrical connection between the second temperature measuring element 42 and the external control system.

[0104] In some embodiments, the busbar device 3 specifically includes a busbar body 31 and a voltage sensor. The busbar body 31 is electrically connected to the terminals 212 of two adjacent battery cells 21. The voltage sampler 32 is electrically connected to the busbar body 31, and the corresponding second temperature measuring element 42 is in contact with the voltage sampler 32.

[0105] In this embodiment, the second temperature measuring element 42 is in contact with the voltage sampler 32, thereby further reducing its assembly difficulty.

[0106] 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.

[0107] As an example, the second temperature measuring element 42 can be connected to the nickel sheet by ultrasonic welding, and thermally conductive colloid can be applied at the connection point. This can improve the stability of the contact between the second temperature measuring element 42 and the nickel sheet, and improve the accuracy of temperature measurement by the second temperature measuring element 42.

[0108] In the embodiment described above, where the circuit board 5 is provided, the voltage sampler 32 can extend along a second direction. The voltage sampler 32 along the second direction may include a first segment contacting the bus device 3 and a second segment contacting the circuit board 5. The second temperature sensing element 42 can be located in the second segment of the voltage sampler 32 and electrically connected to the circuit board 5. This further simplifies the electrical connection structure between the second temperature sensing element 42 and the circuit board 5, thereby further reducing its assembly difficulty. Obviously, the location of the second temperature sensing element 42 is not limited to this; it can also be located in the first segment of the voltage sampler 32.

[0109] It should be noted that a voltage sampler 32 should be provided on the busbar 3 regardless of whether it needs to contact the corresponding second temperature measuring element 42. In other words, each busbar 3 in the battery pack includes a busbar body 31 and a voltage sampler 32, but only a portion of the voltage sampler 32 may contact the second temperature measuring element 42. Compared to the voltage sampler 32 that does not contact the second temperature measuring element 42, the voltage sampler 32 that does contact the second temperature measuring element 42 can have a larger surface area (e.g., in the above embodiment, it can have a longer length along the second direction) to provide sufficient installation space for the second temperature measuring element 42.

[0110] In some embodiments, referring to Figures 6 and 7, the busbar body 31 may have a clearance notch 31a on one side along the first direction, while the voltage sampler 32 is connected to the other side of the busbar body 31 along the first direction, with the corresponding first temperature measuring element 41 at least partially located in the clearance notch 31a to contact the housing 211 of the corresponding battery cell 21.

[0111] In this embodiment, the first temperature measuring element 41 and the voltage sampler 32 are located on opposite sides of the bus device 3 along the first direction. This facilitates the overall circuit arrangement of the first temperature measuring element 41, the voltage sampler 32 and the second temperature measuring element 42, and reduces interference between the circuits of the above components.

[0112] 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.

[0113] It should be noted that, regardless of whether the outer casing 211 of the corresponding battery cell 21 is in contact with the first temperature sensing element 41, the busbar body 31 of the busbar device 3 electrically connected to the terminal post 212 of the corresponding battery cell 21 can have a clearance notch 31a. In other words, the busbar body 31 of each busbar device 3 in the battery pack has a clearance notch 31a, but the first temperature sensing element 41 can be provided in only a portion of the clearance notches 31a.

[0114] 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 element 41 is fixedly connected to the bracket 7 and is at least partially located within the cutout portion 7a. This improves the stability of the installation of the first temperature sensing element 41 and reduces the possibility of displacement of the first temperature sensing element 41 during actual use.

[0115] In this embodiment, the first temperature measuring element 41 is fixed by means of the bracket 7, which can improve the installation stability of the first temperature measuring element 41. As an example, the bracket 7 can extend along the second direction, and its opposite ends along the second direction can be connected to a bus device 3 respectively, thus further improving the installation stability of the first temperature measuring element 41.

[0116] 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. The first temperature measuring element 41, the second temperature measuring element 42, and the voltage sampler 32 are all electrically connected to the circuit board 5.

[0117] Figure 9 is a schematic diagram of the connection points of the temperature measuring device 4, the voltage sampler 32 and the circuit board 5 in an embodiment of this disclosure. Specifically, Figure 9 shows two circuit boards 5 corresponding to two battery units 2. The two battery units 2 are connected in series, and each battery cell 21 in the battery unit 2 is also connected in series. Points V1-V26 are the connection points of the voltage sampler 32 and the circuit board 5, and points NTC1-NTC14 are the connection points of the temperature measuring device 4 and the circuit board 5.

[0118] As can be seen, the configuration method adopted in this embodiment simplifies the circuit structure within the battery pack, saves space, and thus helps to improve the energy density of the battery pack. The specific configuration of circuit board 5 can be found in the descriptions of the relevant locations above, and will not be repeated here.

[0119] In some embodiments, a current-combining device 3 is provided between each two adjacent battery cells 21 of the battery cell 2, and the current-combining device 3 is electrically connected to the terminal post 212 of the corresponding two adjacent battery cells 21; the outer shell 211, the terminal post 212 and the current-combining device 3 electrically connected to the terminal post 212 of the corresponding battery cell 21 are selectively in contact with the temperature measuring device 4.

[0120] In this embodiment, for a single battery cell 21, if its outer casing 211 has already contacted the first temperature sensing element 41, then its terminal 212 and the current collector 3 electrically connected to the terminal 212 will not contact the second temperature sensing element 42, and vice versa. In other words, for a single battery cell 21, it will only have one of the first temperature sensing element 41 or the second temperature sensing element 42. Thus, the total number of the first temperature sensing element 41 and the second temperature sensing element 42 will not exceed the total number of battery cells 21, reducing temperature measurement costs and data processing volume.

[0121] In some embodiments, to further reduce temperature measurement costs and data processing volume, only a portion of the battery cell 21's casing 211, terminal post 212, and current collector 3 electrically connected to the terminal post 212 may selectively contact the temperature measuring device 4, while the other portion of the battery cell 21's casing 211, terminal post 212, and current collector 3 electrically connected to the terminal post 212 may not contact the temperature measuring device 4. That is, the total number of the first temperature measuring element 41 and the second temperature measuring element 42 is less than the total number of battery cells 21.

[0122] As an example, in every two adjacent battery cells 21, only one of the following components—the casing 211, the terminal 212, and the current collector 3 electrically connected to the terminal 212—may be in contact with the temperature measuring device 4: the casing 211, the terminal 212, and the current collector 3 electrically connected to the terminal 212. In the other battery cell 21, none of these components may be in contact with the temperature measuring device 4. This approach balances temperature measurement accuracy and cost.

[0123] Of course, in some embodiments, at least a portion of the battery cell 21's outer casing 211, terminal post 212, and multiple components of the current collector 3 electrically connected to the terminal post 212 are in contact with the temperature measuring device 4. That is, at least a portion of the battery cell 21 is simultaneously provided with a first temperature measuring element 41 and a second temperature measuring element 42, thereby further improving the accuracy of temperature measurement.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] Referring to Figures 1-9, the battery pack includes a housing 1, two battery cells 2, a busbar 3, a circuit board 5, and a temperature measuring device 4. The ratio of the energy value to the power value of the battery pack is less than or equal to 1 / 3.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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 arranged at intervals along the second direction. Thus, the multiple current collectors 3 corresponding to each battery cell 2 will be divided into two rows arranged at intervals along the second direction. The circuit board 5 corresponding to the battery cell 2 is arranged 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 collector 3 along the second direction.

[0133] 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.

[0134] The temperature measuring device 4 includes at least one first temperature measuring element 41 and at least one second temperature measuring element 42, both of which include a thermistor. The first temperature measuring element 41 is in contact with the outer casing 211 of the corresponding battery cell 21, and the second temperature measuring element 42 is in contact with the terminal 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 charging and discharging performance of the battery pack.

[0135] Specifically, the first temperature sensing element 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 terminal post 212 is disposed on the end cap 2111b.

[0136] 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 element 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 element 41 and the end cap 2111b.

[0137] The busbar device 3 includes a busbar body 31, which has a clearance notch 31a. The first temperature measuring element 41 is at least partially located in the clearance notch 31a, so that it can contact the end cap 2111b of the battery cell 21 via the clearance notch 31a.

[0138] In other embodiments, the battery pack further includes a bracket 7 corresponding to the first temperature sensing element 41. The bracket 7 is located between the busbar body 31 and the battery cell 21. The bracket 7 has a hollow portion 7a located within a 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 element 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.

[0139] The second temperature measuring element 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. The second temperature measuring element 42 is in contact with the voltage sampler 32.

[0140] The voltage sampler 32 includes a first section that contacts the bus body 31 and a second section that contacts the circuit board 5, with the second temperature measuring element 42 located in the second section of the voltage sampler 32.

[0141] The voltage sampler 32 specifically includes a nickel sheet, and the second temperature measuring element 42 is welded to the nickel sheet by ultrasonic welding, and the weld joint is coated with thermally conductive adhesive.

[0142] 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 element 41, the second temperature measuring element 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.

[0143] At least one second temperature measuring element 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 element 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°.

[0144] Except for the battery cells 21 located at the ends of the battery cell 2 along the first direction (mainly considering the need to install a second temperature sensor in the end area), in every two adjacent battery cells 21, one of the battery cells 21 has its outer casing 211, terminal post 212, and current collector 3 electrically connected to the terminal post 212 in contact with the temperature sensor 4. That is, the battery cell 21 is correspondingly provided with one of the first temperature sensor 41 and the second temperature sensor 42 in contact. The other battery cell 21 does not have its outer casing 211, terminal post 212, or current collector 3 electrically connected to the terminal post 212 in contact with the temperature sensor 4.

[0145] 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 numbered 1 to 26 along the current flow direction. The first temperature measuring element 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 elements 41 in Figure 9 are NTC2, NTC3, NTC4, NTC5, NTC6, NTC7, NTC9, NTC11, NTC12, NTC13, and NTC14, respectively. The second temperature sensing element 42 contacts the terminals 212 of battery cells 21 (sizes 1, 14, and 17) and / or the busbar 3 electrically connected to the terminals 212. The corresponding points of the three second temperature sensing elements 42 in Figure 9 are NTC1, NTC8, and NTC10, respectively. In the description of this disclosure, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is 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 a suitable manner in any one or more embodiments or examples. Moreover, those skilled in the art can combine different embodiments or examples and features of different embodiments or examples described in this disclosure without contradiction.

[0146] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A battery pack, comprising: Box; At least one battery cell is located inside the housing. The battery cell includes at least two individual battery cells, and the arrangement direction of the at least two individual battery cells is a first direction. Each individual battery cell includes a housing, an electrode assembly located inside the housing, and a terminal post disposed on the housing. The terminal post is electrically connected to the electrode assembly. A combiner device for combining the electrical energy of the battery cells; The temperature measuring device includes at least one first temperature measuring element and at least one second temperature measuring element, wherein the first temperature measuring element is in contact with the outer casing of the corresponding battery cell, and the second temperature measuring element is in contact with the terminal post of the corresponding battery cell and / or the corresponding busbar device. Wherein, at least one of the second temperature measuring elements is located in one end region of the box body along the first direction, at least one of the second temperature measuring elements is located in the other end region of the box body along the first direction, and at least one of the second temperature measuring elements is located in the middle region of the box body along the first direction.

2. The battery pack according to claim 1, wherein, The battery pack includes at least two battery cells arranged along a second direction, and each of the second temperature measuring elements 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.

3. The battery pack according to claim 1 or 2, 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 first temperature measuring element being at least partially located within the clearance opening to contact the metal housing.

4. The battery pack according to claim 3, 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 and is disposed in contact with the first temperature measuring element and the end cap.

5. The battery pack according to any one of claims 1-4, wherein, The second temperature measuring element is configured to contact the corresponding busbar device.

6. The battery pack according to claim 5, wherein, The bus device includes: The busbar body is electrically connected to the terminals of the two adjacent battery cells respectively; A voltage sampler is electrically connected to the bus body, and is positioned in contact with the second temperature measuring element.

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 first temperature measuring element 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 first temperature measuring element, the second temperature measuring element, and the voltage sampler are all electrically connected to the circuit board.

9. The battery pack according to any one of claims 1-8, wherein, 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. The outer casing, terminal, and current-connecting device of the corresponding battery cell are selectively made into contact with the temperature measuring device.

10. The battery pack according to any one of claims 1-9, wherein, The busbar connects two adjacent battery cells of the battery cell 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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