Sampling device, battery management system and battery pack

Abstract

The present disclosure relates to batteries, specifically provides a sampling device, a battery management system and a battery pack, and aims to solve the problem of existing sampling devices occupying a relatively large space. For this purpose, the sampling device in the present disclosure comprises a circuit board and sampling terminals, wherein the circuit board is arranged on an outer side edge of a battery group; and first ends of the sampling terminals are electrically connected to cylindrical battery cells, and second ends of the sampling terminals are electrically connected to the circuit board. The circuit board arranged on the outer side edge of a side plate does not occupy an extra space of a battery pack, and battery cells can be provided in the space of the battery pack that is used for arranging the sampling device in the prior art, thereby improving the energy density of the battery pack. Moreover, there are a relatively small number of circuit elements on the outer side edge of a fixing housing, so that the possibility of the circuit board being interfered with is low, and water absorbent cotton, etc., are generally provided in the battery group, so that the possibility of the circuit board being affected with damp is low. In addition, when the circuit board is arranged on the outer side edge of the side plate, the circuit board is relatively close to the battery cells, so that the sampling terminals can be easily arranged.

Description

Sampling device, battery management system and battery pack

[0001] This application claims priority to Chinese patent application CN202311161342.7, filed on September 8, 2023, with the invention name “Sampling device, battery management system and battery pack”. The entire contents of the above Chinese patent application are incorporated into this application by reference. Technical Field

[0002] The present disclosure relates to the technical field of batteries, and specifically provides a sampling device, a battery management system, and a battery pack. Background Art

[0003] At present, electric vehicles have become the key direction of future vehicle development. Battery packs are an important component of electric vehicles, and the management of battery packs is achieved through battery management systems.

[0004] In conventional battery packs, the sampling device occupies a large space, which affects the charge density of the battery pack.

[0005] Therefore, there is an urgent need for a sampling device, a battery management system and a battery pack to solve the problem that the existing sampling device occupies a large space.

[0006] Summary of the Invention

[0007] The present disclosure aims to solve the above technical problem, that is, to solve the problem that the existing sampling device occupies a large space.

[0008] In a first aspect, the present disclosure provides a sampling device for collecting status information of cylindrical cells in a battery pack, the sampling device comprising: a circuit board arranged on the outer side of the battery pack; a sampling terminal, a first end of the sampling terminal being electrically connected to the cylindrical cell, and a second end being electrically connected to the circuit board.

[0009] In a specific embodiment of the above sampling device, the angle between the plane of the circuit board and the plane where the first end is located ranges from 85° to 95°.

[0010] In a specific embodiment of the above sampling device, the multiple cylindrical cells in the battery pack are arranged vertically, the electrodes of the cylindrical cells are provided on the upper surfaces of the cylindrical cells; and the first end is electrically connected to the electrodes of the cylindrical cells.

[0011] In a specific embodiment of the sampling device, a side plate is provided on a side of the battery pack, and the circuit board is attached to a side of the side plate facing away from the cylindrical battery cell.

[0012] In a specific embodiment of the above sampling device, a positioning hole is provided on the side panel, and a positioning member is provided on the sampling device. The positioning member is connected to the circuit board and is plugged into the positioning hole.

[0013] In a specific embodiment of the above sampling device, the sampling terminal is a nickel sheet.

[0014] In a specific embodiment of the above-mentioned sampling device, the sampling terminal is provided with a buffer zone, the first end and the second end are deformed and displaced through the buffer zone, and the maximum deformation displacement between the first end and the second end is greater than or equal to the displacement of the circuit board relative to the battery pack.

[0015] In a specific embodiment of the above sampling device, the sampling device further includes a temperature sampling component, which is welded or plugged into the circuit board, and one end of the temperature sampling component facing away from the circuit board faces the cylindrical battery cell.

[0016] In a specific embodiment of the above sampling device, the side plate is provided with a through hole, and the end of the temperature sampling member facing away from the circuit board passes through the through hole and is attached to the cylindrical battery core.

[0017] In a specific embodiment of the above sampling device, the side plate is provided with a through hole, the through hole is filled with a heat-conducting material, and the temperature sampling member is in contact with the heat-conducting material.

[0018] In a second aspect, the present disclosure provides a battery management system, comprising: a battery management controller; and the above-mentioned sampling device, wherein the sampling device is electrically connected to the battery management controller.

[0019] In a third aspect, the present disclosure provides a battery pack, comprising: a battery pack including a cylindrical battery cell and a fixed shell, wherein the cylindrical battery cell is fixed in the fixed shell; the above-mentioned sampling device, wherein the circuit board is arranged on the outer side of the fixed shell.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The sampling device provided by the present disclosure includes a circuit board and a sampling terminal. The circuit board is arranged on the outer side of the battery pack; the first end of the sampling terminal is electrically connected to the cylindrical battery cell, and the second end is electrically connected to the circuit board. In the battery pack, since there is a certain gap between adjacent battery packs, the circuit board arranged on the outer side of the side panel will not occupy additional space in the battery pack and will not reduce the energy density of the battery pack. At the same time, the battery pack provided by the present disclosure can use the space used for setting the sampling device in the known technology to place the battery cells to improve the energy density of the battery pack. At the same time, there are fewer circuit elements on the outer side of the fixed shell, and the possibility of the circuit board being interfered with is low. In addition, absorbent cotton and the like are generally provided in the battery pack, and the possibility of the circuit board being damp is low. In addition, when the circuit board is arranged on the outer side of the side panel, the distance between the circuit board and the battery cell is close, which can facilitate the arrangement of the sampling terminal.

[0022] Furthermore, the sampling terminal is provided with a buffer zone, through which the first and second ends deform and displace, and the maximum deformation displacement between the first and second ends is greater than or equal to the displacement of the circuit board relative to the battery pack. When the battery pack or battery pack is impacted and vibrates, the nickel sheet in the buffer zone can deform, causing deformation and displacement between the first and second ends of the sampling terminal, and simultaneously causing impact displacement between the circuit board and the battery pack. If the maximum deformation displacement between the first and second ends is greater than or equal to the displacement of the circuit board relative to the battery pack, it can eliminate stress within the sampling terminal, reduce the pulling force of the sampling terminal on the battery cell and circuit board, and thus reduce the possibility of the sampling terminal becoming unsoldered. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The preferred embodiments of the present disclosure are described below with reference to the accompanying drawings, in which:

[0024] FIG1 shows a method for connecting cells in parallel in a battery pack provided by the present disclosure;

[0025] FIG2 is a diagram showing a method of connecting cells in series in a battery pack provided by the present disclosure;

[0026] FIG3 is a schematic structural diagram of a battery pack provided by the present disclosure;

[0027] FIG4 is an example of a temperature sampling component in a battery pack provided by the present disclosure;

[0028] FIG5 is a structural diagram of some examples of sampling devices provided by the present disclosure;

[0029] FIG6 is a schematic structural diagram of a sampling terminal provided by the present disclosure;

[0030] FIG7 is a structural diagram of some other examples of sampling devices provided by the present disclosure;

[0031] FIG8 is a structural diagram of some further examples of sampling devices provided by the present disclosure;

[0032] FIG9 is a structural diagram of some other examples of sampling devices provided by the present disclosure.

[0033] Explanation of the accompanying drawings: 1. Battery cell; 2. Circuit board; 21. First board; 22. Second board; 23. Transmission line; 3. Bus; 4. Sampling chip; 5. Sampling terminal; 51. First side; 511. First welding area; 52. Second side; 521. Second welding area; 53. Buffer zone; 6. Daisy chain; 7. Fixed shell; 71. Bottom plate; 72. Side plate; 721. Positioning hole; 722. Through hole; 8. Positioning piece; 9. Temperature sampling piece. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present disclosure are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present disclosure and are not intended to limit the scope of protection of the present disclosure.

[0035] It should be noted that in the description of this disclosure, terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element described must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] Furthermore, it should be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "installed," "installed," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on the specific circumstances.

[0037] In conventional technology, a battery pack using a CTP (Cell to Pack) structure consists of multiple battery packs and a housing. The battery packs are installed within the housing, with a certain amount of space between adjacent battery packs. The space at the front of the housing, near the sidewalls, is the front compartment, primarily used for accommodating electronic control components and cooling pipes.

[0038] The battery management system includes a battery management controller and multiple battery supervision circuits (CSCs). Each battery pack is equipped with a BMU to monitor the status information of the battery cell 1. The status information of the battery cell 1 includes but is not limited to voltage. The status information of the battery cells monitored by the BMU is uploaded to the BMC via the bus for processing and analysis, thereby comprehensively managing the battery pack. Specifically, each battery pack is equipped with a BMU. Several BMUs form a slave battery management unit (SBMU). Depending on the required energy storage capacity, an appropriate number of SBMUs form a master battery management unit (MBMU). It is also equipped with other required modules such as an on-site monitoring system, high-voltage detection and insulation monitoring modules. These modules together constitute the battery management system (BMS).

[0039] In the known technology, the sampling device is centrally arranged in the front compartment of the battery pack. To prevent the circuit boards from getting damp or interfering with each other, a shell is provided on the outside of the sampling device, resulting in the sampling device occupying a larger space and affecting the power density of the battery pack.

[0040] In order to solve the above problems, the present disclosure provides a battery pack, which includes a sampling device and a battery pack.

[0041] Figure 1 shows a parallel connection method for the battery cells of the battery pack provided by the present disclosure. Figure 2 shows a series connection method for the battery cells of the battery pack provided by the present disclosure.

[0042] As shown in FIG1 and FIG2 , each battery pack includes a plurality of battery cells 1 and a fixing shell 7 . All the battery cells 1 are fixed by the fixing shell 7 to keep the battery cells 1 stable.

[0043] In the example disclosed herein, the battery cell 1 is a cylindrical battery cell. Multiple battery cells 1 in a battery pack are arranged vertically, and the electrodes of the battery cells 1 are disposed on the upper and lower surfaces of the battery cells 1, wherein the positive electrode of the battery cell 1 is located on the upper surface of the battery cell 1, and the negative electrode is located on the lower surface of the battery cell 1.

[0044] Multiple cells 1 in a single battery pack are first connected in parallel to form parallel segments, and then the multiple parallel segments are connected in series to ensure a stable voltage in the battery pack. A busbar 3 is provided between adjacent parallel segments of cells 1 in the battery pack. The first end of the busbar 3 is connected to the positive electrode of one cell 1, and the second end of the busbar 3 is connected to the negative electrode of an adjacent cell 1. Multiple busbars 3 can be used to connect the parallel segments of multiple cells 1 in series. Taking a cylindrical cell as an example, assuming that the voltage of the cylindrical cell is 3.7V, the voltage of each parallel segment is 3.7V. If the number of parallel segments connected in series in the battery pack is 33, the voltage of the battery pack is 122.1V. The more parallel segments in the battery pack are connected in series, the higher the voltage of the battery pack.

[0045] FIG3 is a schematic structural diagram of a battery pack provided by the present disclosure.

[0046] As shown in Figure 3, the fixed housing 7 includes a bottom plate 71 and a side plate 72. The side plate 72 is protruding from one side surface of the bottom plate 71. All the battery cells 1 are fixedly arranged in the area surrounded by the bottom plate 71 and the side plate 72 to keep the battery cells 1 in a stable state.

[0047] FIG5 is a structural diagram of some examples of sampling devices provided by the present disclosure.

[0048] As shown in Figures 3 and 5, the sampling device includes a circuit board 2, a sampling chip 4 and a sampling terminal 5. The sampling chip 4 is arranged on the circuit board 2 and electrically connected to the circuit board 2. There are multiple sampling terminals 5. The first end of each sampling terminal 5 is electrically connected to the electrode of the battery cell 1, specifically welded to the bus 3 to achieve electrical connection with the electrode of the battery cell 1; the second end of the sampling terminal 5 is electrically connected to the circuit board 2. The voltage collected by the first end of the sampling terminal 5 is the voltage of a parallel segment of the battery cell 1. The status information of the battery cell 1 is transmitted to the sampling chip 4 in turn through the sampling terminal 5 and the circuit board 2, and then processed by the sampling chip 4 and uploaded to the battery management controller. In the specific example of the present disclosure, the sampling chip 4 is an analog sampling terminal AFE (Analog Front End), which is mainly used to convert the analog signal of the collected battery cell 1 status information into a digital signal and upload it.

[0049] As shown in Figure 3, the circuit board 2 is attached to the side of the side panel 72 facing away from the battery cell 1. The side panel 72 is provided with a positioning hole 721, and the sampling device is provided with a positioning member 8. The positioning member 8 is connected to the circuit board 2 and inserted into the positioning hole 721 to position or fix the circuit board 2 and the side panel 72.

[0050] In the battery pack, since there is a certain gap between adjacent battery groups, the circuit board 2 arranged on the outer side of the side panel 72 will not occupy additional space in the battery pack and will not reduce the energy density of the battery pack. At the same time, the battery pack provided by the present disclosure can use the space used for setting the sampling device in the known technology to place the battery cell 1 to improve the energy density of the battery pack. At the same time, there are fewer circuit elements on the outer side of the fixed shell 7, and the possibility of the circuit board 2 being interfered with is low. In addition, absorbent cotton and the like are generally provided in the battery pack, and the possibility of the circuit board 2 being damp is low. Therefore, the circuit board 2 can be exposed (that is, no protective shell is provided) to further reduce the space occupied by the sampling device. In addition, when the circuit board 2 is provided on the outer side of the side panel 72, the distance between the circuit board 2 and the battery cell 1 is close, which can facilitate the setting of the sampling terminal 5.

[0051] As shown in Figure 3, in some embodiments, the sampling device further includes a temperature sampling component 9, which is electrically connected to the circuit board 2. Specifically, the temperature sampling component 9 is welded or plugged into the circuit board 2. The temperature sampling component 9 can collect the temperature information of the battery cell 1, and transmit the temperature information to the signal processing chip via the circuit board 2, and convert the temperature information into digital information. The signal processing chip can be set on the circuit board 2 or on other circuit modules. When the signal processing chip is set on the circuit board 2, it can be a sampling chip 4 or other processing chip.

[0052] In one possible embodiment, the temperature sampling element 9 is of a patch type. The patch type temperature sampling element 9 is directly welded to the circuit board 2 and is attached near the circuit board 2. A through hole 722 is provided on the side panel 72, and the through hole 722 passes through the side panel 72 to connect the battery cell side and the circuit board side. The through hole 722 is filled with a thermally conductive material, such as thermally conductive adhesive, and the temperature sampling element 9 is in contact with the thermally conductive material. The temperature of the battery cell 1 can be transmitted to the patch type temperature sampling element 9 through the thermally conductive material, making the temperature information of the battery cell 1 collected by the patch type temperature sampling element 9 more accurate.

[0053] FIG4 is an example of a temperature sampling component in a battery pack provided by the present disclosure.

[0054] In another possible embodiment, as shown in FIG4 , the temperature sampling component 9 is of a wiring harness type or a plug-in type. The wiring harness type temperature sampling component 9 is welded or plugged into the circuit board 2 through a flexible circuit board to achieve electrical connection, and the plug-in type temperature sampling component 9 is plugged into the circuit board 2 through a slot to achieve electrical connection. Both the wiring harness type and the plug-in type temperature sampling components 9 have a certain length. A through hole 722 is provided on the side panel 72, and the through hole 722 passes through the side panel 72 to connect the battery cell side and the circuit board side. The end of the wiring harness type and the plug-in type temperature sampling component 9 facing away from the circuit board 2 passes through the through hole 722 and is attached to the outer surface of the battery cell 1, thereby directly obtaining the temperature information of the battery cell 1.

[0055] FIG6 is a schematic structural diagram of a sampling terminal provided by the present disclosure.

[0056] Regarding the sampling terminal 5 , as shown in FIG6 , in some examples, the sampling terminal 5 is a nickel sheet. Since the distance between the circuit board 2 and the battery cell 1 is relatively close, it is possible to use the nickel sheet as the sampling terminal 5 .

[0057] There is an angle between the plane of the circuit board 2 and the plane where the first end of the sampling terminal 5 is located. The angle ranges from 85° to 95°, and is preferably 90°.

[0058] Specifically, the sampling terminal 5 has a first side 51 and a second side 52. The first end of the sampling terminal 5, namely the end of the first side 51 facing away from the second side 52, is also called the first welding area 511. The first welding area 511 is welded to the battery cell 1 or the busbar 3, electrically connecting the first end of the sampling terminal 5 to the battery cell 1. The second end of the sampling terminal 5, namely the end of the second side 52 facing away from the first side 51, is also called the second welding area 521. The second welding area 521 is welded to the circuit board 2, electrically connecting the second end of the sampling terminal 5 to the circuit board 2. The second side 52 is generally arranged parallel to the circuit board 2 to facilitate soldering of the second side 52 to the circuit board 2. The plane in which the first end of the sampling terminal 5 lies is the plane in which the first side 51 lies, and the plane in which the circuit board 2 lies is the plane in which the second side 52 lies. Therefore, the angle between the plane of the circuit board 2 and the plane in which the first end of the sampling terminal 5 lies is the angle between the first side 51 and the second side 52.

[0059] Furthermore, the sampling terminal 5 is provided with a buffer zone 53. Specifically, the buffer zone 53 is provided on the first side 51. The buffer zone 53 is a nickel sheet in a zigzag or wavy shape. The nickel sheet in the buffer zone 53 has a certain elasticity and can deform to form a deformation displacement between the first and second ends of the sampling terminal 5. When the battery pack or battery pack is impacted and vibrates, the nickel sheet in the buffer zone 53 can deform to form a deformation displacement between the first and second ends of the sampling terminal 5. Simultaneously, the circuit board 2 and the battery pack will also produce an impact displacement. If the maximum deformation displacement between the first and second ends is greater than or equal to the displacement of the circuit board 2 relative to the battery pack, the stress within the sampling terminal 5 can be eliminated, reducing the pulling force of the sampling terminal 5 on the battery cell 1 and the circuit board 2, thereby reducing the possibility of the sampling terminal 5 becoming unsoldered.

[0060] It should be noted that although the buffer zone 53 is set on the first side 51 in the example of the present disclosure, this is not a specific limitation of the present disclosure. Without departing from the principles of the present disclosure, in other embodiments, those skilled in the art may also set the buffer zone 53 on the second side 52, or set it on both the first side 51 and the second side 52 at the same time.

[0061] Regarding the sampling terminal 5, in some other examples, the sampling terminal 5 includes a first connecting wire and a first connector, with two first connecting wires. One end of one first connecting wire is electrically connected to the first connector, and the other end is electrically connected to the battery cell 1. Another first connecting wire has one end electrically connected to the first connector, and the other end is electrically connected to the circuit board 2. The first connecting wire can be a wiring harness or a flexible circuit board. The flexible circuit can be an FPC (Flexible Printed Circuit) flexible etched circuit or an FDC (Flexible Die-cutting Circuit) flexible circuit.

[0062] The first connector, also called a connector, includes a plug and a socket that can be plugged into each other to achieve electrical connection. The plug and socket are each electrically connected to a first connecting wire. Then, plugging the plug and socket of the first connector together can achieve electrical connection between the two first connecting wires.

[0063] Regarding the sampling terminal 5 , in some other examples, the sampling terminal 5 includes a first connecting wire, and two ends of the first connecting wire are electrically connected to the battery cell 1 and the circuit board 2 respectively.

[0064] Regarding the configuration of the circuit board 2, as shown in FIG5 , in some examples, the circuit board 2 includes multiple first boards 21 , each of which is provided with a sampling chip 4 . Each first board 21 is connected to a correspondingly small number of sampling terminals 5 . This reduces the length of each first board 21 , making it less susceptible to the stress caused by the long length of the first boards 21 when using a printed circuit board. Of course, in other embodiments, all first boards 21 may be formed of flexible printed circuit boards, or some first boards 21 may be formed of flexible printed circuit boards while others may be formed of printed circuit boards.

[0065] FIG7 is a structural diagram of other examples of sampling devices provided by the present disclosure.

[0066] Regarding the configuration of the circuit board 2, as shown in FIG7 , in other examples, the circuit board 2 includes a first board 21 and a second board 22, with a transmission line 23 provided between the first board 21 and the second board 22 for signal transmission. Each first board 21 is connected to at least one second board 22. The sampling chip 4 is provided on the first board 21 and electrically connected to the first board 21. The sampling chip 4 is specifically connected to the first board 21 by soldering. By dividing the circuit board 2 into the first board 21 and the second board 22, the length of a single circuit board 2 can be effectively reduced. At the same time, the second board 22 serves as an extension of the first board 21. The status information of the battery cell 1 connected to the second board 22 can be transmitted to the first board 21 via the transmission line 23, thereby making the number of sampling terminals 5 connected to the first board 21 and the second board 22 as equal as possible to the number of sampling channels of the sampling chip 4, maximizing the efficiency of the sampling chip 4, thereby reducing the number of sampling chips 4 used and saving costs. Of course, in most cases, the number of sampling channels of the sampling chip 4 cannot be fully utilized, and the number of sampling terminals 5 connected to the first board 21 and the second board 22 may be slightly smaller than the number of sampling channels of the sampling chip 4 .

[0067] FIG8 is a structural diagram of some further examples of sampling devices provided by the present disclosure.

[0068] Regarding the arrangement of the circuit board 2, as shown in FIG8 , in some examples, one first board 21 is connected to two second boards 22. Of course, this is not a specific limitation of the present disclosure; without departing from the principles of the present disclosure, in other examples, each first board 21 may be connected to more than two second boards 22. Generally speaking, each first board 21 is connected to two second boards 22, with the two second boards 22 located on either side of the first board 21. This facilitates wiring and prevents cross-intersection of wires.

[0069] As shown in FIG7 , regarding the arrangement of the sampling chip 4, in some examples, only one sampling chip 4 is provided on the first board 21. This arrangement can easily ensure that the number of sampling terminals 5 connected to the first board 21 and the second board 22 is equal to the number of sampling channels of the sampling chip 4.

[0070] As shown in Figure 8 , regarding the arrangement of the sampling chips 4, in other examples, two or more sampling chips 4 are provided on the first board 21. If two or more sampling chips 4 are provided on the first board 21, and provided that the sampling channels of the sampling chips 4 correspond one-to-one with the battery cells 1, each first board 21 can collect state parameters for a greater number of battery cells 1, thereby reducing the number of first boards 21 provided. Because the manufacturing process of the first board 21 is relatively complex and its manufacturing cost is relatively high, reducing the number of first boards 21 can further reduce the cost of the sampling device.

[0071] Regarding the connection position of the sampling terminal 5, as shown in Figure 8, in some examples, the sampling terminal 5 is connected to both the first plate 21 and the second plate 22. One end of the sampling terminal 5 is electrically connected to the battery cell 1. The ends of some sampling terminals 5 facing away from the battery cell 1 are electrically connected to the first plate 21, while the ends of other sampling terminals 5 facing away from the battery cell 1 are connected to the second plate 22. The voltage signals of some battery cells 1 are transmitted to the sampling chip 4 through the sampling terminal 5, the second plate 22, the transmission line 23, and the first plate 21 in sequence. The voltage signals of other battery cells 1 are transmitted to the sampling chip 4 through the sampling terminal 5 and the first plate 21 in sequence.

[0072] FIG9 is a structural diagram of some other examples of sampling devices provided by the present disclosure.

[0073] Regarding the connection location of the sampling terminal 5, as shown in Figure 9, in some other examples, the sampling terminal 5 is connected only to the second plate 22. One end of the sampling terminal 5 is electrically connected to the battery cell 1, and the other end is electrically connected to the second plate 22. The voltage signal of the battery cell 1 is transmitted sequentially through the sampling terminal 5, the second plate 22, the transmission line 23, and the first plate 21 to the sampling chip 4. The placement of the sampling chip 4 on the first plate 21 complicates the circuitry. By omitting the sampling terminal 5 from the first plate 21, the length of the first plate 21 can be reduced, further reducing stress on the first plate 21.

[0074] Regarding the materials of first and second plates 21, 22, in some examples, both first and second plates 21, 22 are printed circuit boards to reduce the cost of the sampling device. Using nickel sheets as sampling terminals 5 simplifies and reliably connects the sampling terminals 5 to the first and second plates 21, 22. Furthermore, using a printed circuit board as second plate 22 allows for direct soldering of the sampling chip 4.

[0075] Regarding the materials of the first and second plates 21, 22, in some other examples, the first plate 21 is a printed circuit board (PCB) and the second plate 22 is a flexible circuit board (FPC). Due to the inherent characteristics of FPCs, they offer low stress and can be extended, allowing the second plate 22 to connect to more battery cells 1 via the sampling terminals 5. When the second plate 22 is a FPC, the sampling terminals 5 can be lead-out portions extending from the second plate 22. The lead-out portions of the sampling terminals 5 within the second plate 22 can include copper foil, aluminum foil, copper-nickel ribbon, aluminum-nickel ribbon, or nickel ribbon.

[0076] Regarding the materials of the first plate 21 and the second plate 22, in some other examples, the first plate 21 is a flexible circuit board, and the second plate 22 is a flexible circuit board or a printed circuit board. When the first plate 21 is a flexible circuit board, the portion of the first plate 21 where the sampling chip 4 is located needs to be hardened to facilitate soldering of the sampling chip 4.

[0077] Regarding the transmission line 23, in some examples, the transmission line 23 includes a connecting line, and both ends of the connecting line are electrically connected to the first board 21 and the second board 22 respectively, specifically by plugging or welding. The connecting line can be a wire harness or a flexible line.

[0078] Regarding the transmission line 23, in some other examples, the transmission line 23 includes a second connector and second connecting wires. At least some of the second connecting wires have one end electrically connected to the second connector and the other end electrically connected to the first board 21 or the second board 22, thereby establishing circuit communication between the first board 21 and the second board 22. Specifically, when there is only a single second connector, all second connecting wires have one end electrically connected to the second connector and the other end electrically connected to the first board 21 or the second board 22. When there are multiple second connectors, at least one second connecting wire has one end electrically connected to the first board 21 and the other end electrically connected to a second connector, at least one second connecting wire has one end electrically connected to the second board 22 and the other end electrically connected to a second connector, and the remaining second connecting wires have both ends electrically connected to different second connectors. The electrical connection can be made by welding or plugging. The second connecting wires can be a wiring harness or a flexible circuit. The structure of the second connector is the same as that of the first connector.

[0079] A daisy chain 6 is also provided between the first board 21 and the second board 22 for communication. The two ends of the daisy chain 6 are electrically connected to the first board 21 and the second board 22, respectively. The purpose of the communication between the first board 21 and the second board 22 via the daisy chain 6 is to isolate the high-voltage side from the low-voltage side. The high-voltage side refers to the collected voltage signal of the battery cell 1, and the low-voltage side refers to the low-voltage signal processed by the sampling chip 4.

[0080] Based on the above-mentioned sampling device, the present disclosure also provides a battery management system, which includes a battery management controller and the above-mentioned sampling device. The sampling device is electrically connected to the battery management controller, and can collect and process the status information of the battery cell 1 and upload it to the battery management controller for further processing and analysis, so as to facilitate comprehensive management of the battery pack.

[0081] Based on the above-mentioned sampling device, the present disclosure further provides a battery pack, which includes the above-mentioned sampling device and the above-mentioned battery pack, and the circuit board 2 is arranged on the outer side of the side plate 72 away from the battery cell 1.

[0082] In summary, the advantages of the battery pack provided by the present disclosure are as follows:

[0083] The circuit board 2 is fitted on the side of the side panel 72 away from the battery cell 1. In the battery pack, since there is a certain gap between adjacent battery groups, the circuit board 2 arranged on the outer side of the side panel 72 will not occupy additional space in the battery pack and will not reduce the energy density of the battery pack. At the same time, the battery pack provided by the present disclosure can use the space used for setting the sampling device in the known technology to place the battery cell 1 to improve the energy density of the battery pack. At the same time, there are fewer circuit elements on the outer side of the fixed shell 7, and the possibility of the circuit board 2 being interfered with is low. In addition, absorbent cotton and the like are generally provided in the battery pack, and the possibility of the circuit board 2 being damp is low. Therefore, the circuit board 2 can be provided in a naked manner to further reduce the space occupied by the sampling device. In addition, when the circuit board 2 is provided on the outer side of the side panel 72, the distance between the circuit board 2 and the battery cell 1 is close, which can facilitate the setting of the sampling terminal 5.

[0084] Thus far, the technical solutions of the present disclosure have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present disclosure is clearly not limited to these specific embodiments. Without departing from the principles of the present disclosure, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present disclosure.

Claims

1. A sampling device for collecting status information of a cylindrical battery cell (1) in a battery pack, characterized in that: The sampling device comprises: A circuit board (2) is arranged on the outer side of the battery pack; A sampling terminal (5), wherein a first end of the sampling terminal (5) is electrically connected to the cylindrical battery core (1), and a second end of the sampling terminal (5) is electrically connected to the circuit board (2).

2. The sampling device according to claim 1, characterized in that: The angle between the plane of the circuit board (2) and the plane where the first end is located ranges from 85° to 95°.

3. The sampling device according to claim 1 or 2, characterized in that: The plurality of cylindrical battery cells (1) in the battery pack are arranged vertically, and the electrodes of the cylindrical battery cells (1) are arranged on the upper surface of the cylindrical battery cells (1); The first end is electrically connected to an electrode of the cylindrical battery core (1).

4. The sampling device according to claim 1, characterized in that: A side plate (72) is provided on the side of the battery pack, and the circuit board (2) is attached to the side of the side plate (72) facing away from the cylindrical battery core (1).

5. The sampling device according to claim 4, characterized in that: The side plate (72) is provided with a positioning hole (721), the sampling device is provided with a positioning member (8), the positioning member (8) is connected to the circuit board (2), and the positioning member (8) is plugged into the positioning hole (721).

6. The sampling device according to claim 1, characterized in that: The sampling terminal (5) is a nickel sheet.

7. The sampling device according to claim 1, characterized in that: The sampling terminal (5) is provided with a buffer zone (53), the first end and the second end are deformed and displaced through the buffer zone (53), and the maximum deformation displacement between the first end and the second end is greater than or equal to the displacement of the circuit board (2) relative to the battery pack.

8. The sampling device according to claim 4, characterized in that: The sampling device further comprises a temperature sampling component (9), wherein the temperature sampling component (9) is welded or plugged into the circuit board (2), and an end of the temperature sampling component (9) facing away from the circuit board (2) faces the cylindrical battery core (1).

9. The sampling device according to claim 8, characterized in that: The side plate (72) is provided with a through hole (722), and the end of the temperature sampling component (9) facing away from the circuit board (2) passes through the through hole (722) and is then attached to the cylindrical battery core (1).

10. The sampling device according to claim 8, characterized in that: The side plate (72) is provided with a through hole (722), the through hole (722) is filled with a heat-conducting material, and the temperature sampling component (9) is in contact with the heat-conducting material.

11. A battery management system, characterized in that: include: Battery management controller; The sampling device according to any one of claims 1 to 10, wherein the sampling device is electrically connected to the battery management controller.

12. A battery pack, characterized in that: include: A battery pack, comprising a cylindrical battery core (1) and a fixing shell (7), wherein the cylindrical battery core (1) is fixed in the fixing shell (7); The sampling device according to any one of claims 1 to 10, wherein the circuit board (2) is arranged on an outer side of the fixed shell (7).

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