Battery cell cover plate, battery and battery pack

Abstract

The invention discloses a battery cell cover plate, a battery and a battery pack, and belongs to the technical field of batteries. The battery cell cover plate comprises a plate body, a battery management unit, a sensor assembly and a connecting terminal; the battery management unit and the connecting terminal are both fixed on the plate body, and the sensor assembly is located on the first surface of the plate body; and the battery management unit and the sensor assembly are electrically connected through the connecting terminal. According to the invention, the intelligence of a single battery can be realized, and the sealing property and the insulating property of the battery are ensured.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a battery cell cover, a battery and a battery pack. Background Art

[0002] With the rapid development of science and technology, the number of electrical devices is increasing, and batteries are widely used. Electrical devices are powered by battery packs. Battery packs include multiple batteries. These multiple batteries are connected in parallel or in series to power the electrical devices together. Each battery consists of multiple cells.

[0003] Usually, a battery pack includes a battery management system (BMS), and each battery includes a battery management unit (BMU) and sensors. The sensors are used to detect environmental data such as pressure and temperature inside a single battery, and send these environmental data to the BMU. The BMU makes some preliminary judgments and preliminary processing on the battery itself based on these environmental data. The BMU also sends the acquired environmental data to the BMS, which then processes the battery. Summary of the invention

[0004] The present disclosure provides a battery cell cover, a battery and a battery pack, and the technical solution is as follows:

[0005] In a first aspect, a battery cell cover is provided, the battery cell cover comprising a plate body, a battery management unit, a sensor assembly and a connection terminal;

[0006] The battery management unit and the connection terminal are both fixed to the board body, and the sensor assembly is located on the first surface of the board body;

[0007] The battery management unit and the sensor assembly are electrically connected via the connecting terminal.

[0008] In the solution shown in the present disclosure, the battery cover is integrated with a battery management unit. The battery management unit BMU can manage and balance the batteries and realize communication between the batteries and the battery management system BMS, thereby realizing the intelligence of a single battery.

[0009] In the solution shown in the present disclosure, the cell cover plate includes a connecting terminal, through which the electrical connection between the battery management unit and the sensor is achieved, and the connecting terminal is sealed and fixed in the plate body of the cell cover plate, thereby ensuring the sealing of the battery.

[0010] Furthermore, the terminals of the connection terminals have good insulation properties, thereby ensuring good insulation properties of the battery.

[0011] In a possible implementation, the connection terminal includes a terminal and a plurality of conductive posts;

[0012] The terminal has a plurality of first through holes, the first through holes correspond to the conductive posts one by one, each conductive post is welded in the corresponding first through hole, and both ends of the conductive post extend out of the first through hole;

[0013] The terminal is fixed to the plate body, the battery management unit is electrically connected to the first ends of the plurality of conductive pillars, and the sensor assembly is electrically connected to the second ends of the plurality of conductive pillars.

[0014] In a possible implementation, the connection terminal further includes an annular buffer, the buffer is welded to the plate body, and the terminal is welded to the buffer.

[0015] In a possible implementation, the cross-section of the buffer is in a semi-I-shape, including a lower gasket and an upper gasket;

[0016] The plate body has a mounting opening, and the mounting opening has a step at a position close to the first surface of the plate body;

[0017] The lower surface of the lower gasket and the upper surface of the step are welded, and the upper surface of the upper gasket and the lower surface of the terminal are welded.

[0018] In the solution disclosed in the present invention, the cross-sectional shape of the buffer is a semi-I-shaped, and the cross-sectional shape of the mounting port is a stepped shape. Then, the lower surface of the lower gasket and the upper surface of the step are welded together, and the upper surface of the upper gasket and the lower surface of the terminal are welded together, so that the connection terminal and the mounting port are well sealed.

[0019] In a possible implementation, the battery management unit includes a main board, the main board has a plurality of second through holes, the second through holes correspond to the conductive pillars one by one, and the main board is provided with a pad around each second through hole;

[0020] The main board covers the terminal, and the first end of each conductive column extends out of the corresponding second through hole, and the extended portion is welded to the pad around the second through hole.

[0021] In the solution shown in the present disclosure, the first end of the conductive column extends out of the first surface of the terminal, so the main board of the battery management unit and the conductive column can be connected by plugging and then welded to achieve electrical connection. This simplifies the assembly of the battery management unit and the board, and simplifies the connection between the battery management unit and the connection terminal.

[0022] In a possible implementation, the cell cover plate further includes a positive electrode connecting plate and a negative electrode connecting plate, and the positive electrode connecting plate and the negative electrode connecting plate are both located on the first surface of the plate body;

[0023] The battery management unit is electrically connected to the positive electrode connecting piece and the negative electrode connecting piece respectively through the connecting terminals.

[0024] In the solution shown in the present disclosure, a wire is led out from inside the battery and connected to a battery management unit through a connecting terminal to supply power to the battery management unit.

[0025] In a possible implementation, the sensor assembly includes a diaphragm and at least one sensor, and the at least one sensor is fixed on the diaphragm;

[0026] The membrane is located on the first surface of the plate body and is used to be sandwiched between two adjacent battery cells of the battery;

[0027] The at least one sensor is electrically connected to the connection terminal.

[0028] In the solution shown in the present disclosure, a diaphragm with a sensor fixed thereon is sandwiched between two battery cells. Then, the sensor can collect the internal state of the battery, thereby providing more accurate feedback on the internal state of the battery.

[0029] In a possible implementation, the diaphragm includes a clamping sheet and a connecting sheet, and the clamping sheet and the connecting sheet are vertically connected;

[0030] The at least one sensor is fixed on the clamping sheet, and the clamping sheet is used to be clamped between two adjacent battery cells of the battery;

[0031] The connecting piece is located on the first surface of the board body, and a plurality of pads of the connecting piece are welded one by one with a plurality of conductive pillars of the connecting terminal.

[0032] In the solution shown in the present disclosure, the sensor is fixed on a clamping plate, and the clamping plate is clamped between two battery cells, so that the sensor monitors the internal state of the battery.

[0033] In the solution shown in the present disclosure, the connecting piece is located on the first surface of the board and covers multiple sensor conductive columns. The pads on the connecting piece are welded to the sensor conductive columns one by one, thereby achieving a fixed connection between the diaphragm and the board, and achieving an electrical connection between the sensor and the sensor conductive columns.

[0034] In a possible implementation, the length and width of the clamping sheet are respectively the same as the length and width of the battery cell in which the clamping sheet is located.

[0035] In the solution shown in the present disclosure, the clamping plate and the battery cell have the same size, so that the pressure of the clamping plate on the battery cell is equal everywhere, avoiding the influence of uneven force on the battery cell.

[0036] In a possible implementation manner, the at least one sensor is close to a center position of the clamping piece.

[0037] In a possible implementation, the clamping sheet is clamped between two middle battery cells of the battery.

[0038] In the solution shown in the present disclosure, at least one sensor can collect the status at the center of the battery, thereby more accurately feeding back the status inside the battery.

[0039] In a second aspect, a battery cell cover plate is provided, the battery cell cover plate comprising a plate body, a battery management unit and a sensor assembly;

[0040] The sensor assembly includes a diaphragm and at least one sensor, and the at least one sensor is fixed on the diaphragm;

[0041] The membrane is located on the first surface of the plate body and is used to be sandwiched between two adjacent battery cells of the battery;

[0042] The battery management unit is fixed to the board and is electrically connected to the at least one sensor.

[0043] In the solution shown in the present disclosure, since the diaphragm with the sensor fixed thereon can be clamped between two battery cells, the sensor can collect the internal state of the battery, thereby providing more accurate feedback on the internal state of the battery.

[0044] In a third aspect, a battery is provided, the battery comprising a cell module, a shell module and the cell cover plate according to the first aspect and the second aspect;

[0045] The battery cell module is located in the shell assembly. The shell assembly has an opening. The battery cell cover is sealed and fixed in the opening. The first surface of the battery cell cover faces the battery cell module.

[0046] In a fourth aspect, a battery pack is provided, the battery pack comprising a battery management system and a battery module, the battery module comprising the battery described in the third aspect, and a communication relationship between the battery management unit of the battery and the battery management system.

[0047] In a fifth aspect, an electrical device is provided, which includes the battery pack described in the fourth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is an exploded schematic diagram of a battery provided by the present disclosure;

[0049] Figure 2 is a schematic diagram of an assembled battery provided by the present disclosure;

[0050] Figure 3It is an exploded schematic diagram of a battery cell cover provided by the present disclosure;

[0051] Figure 4 This is a schematic diagram of a battery cell cover provided by the present disclosure after being assembled, with the second surface of the plate body visible;

[0052] Figure 5 This is a schematic diagram of a battery cell cover provided by the present disclosure after being assembled, with the first surface of the plate body visible;

[0053] Figure 6 It is a schematic diagram showing a first surface of a plate body of a battery cell cover provided by the present disclosure;

[0054] Figure 7 It is a schematic diagram showing a second surface of a plate body of a battery cell cover provided by the present disclosure;

[0055] Figure 8 is an exploded schematic diagram of a connection terminal provided by the present disclosure;

[0056] Fig. 9 is a schematic diagram of an assembled connection terminal provided by the present disclosure;

[0057] Fig.10 is a cross-sectional schematic diagram of a connection terminal provided by the present disclosure being assembled in a mounting opening of a plate body;

[0058] Fig.11 is a schematic diagram of a mainboard of a battery management unit provided by the present disclosure;

[0059] Fig.12 It is a partial explosion schematic diagram of a battery cell cover provided by the present disclosure;

[0060] Fig.13 It is a schematic diagram of assembling a mainboard of a battery management unit provided by the present disclosure on a board body;

[0061] Fig.14 is a schematic diagram of a sensor assembly provided by the present disclosure;

[0062] Fig.15 It is a schematic diagram of assembling a sensor assembly on a plate provided by the present disclosure;

[0063] Fig.16 yes Fig.15 A local enlarged schematic diagram at point A.

[0064] Description of Reference Numerals

[0065] 100, battery cell cover; 200, battery cell module; 300, housing module; 301, first housing; 302, second housing; 303, third housing.

[0066] 1. Plate body; 11. First surface; 12. Second surface; 13. Mounting opening; 131. Step.

[0067] 2. Battery management unit; 21. Main board; 211. Second through hole; 212. Solder pad.

[0068] 3. Sensor assembly; 31. Diaphragm; 32. Sensor; 311. Clamping piece; 312. Connecting piece.

[0069] 4. Connecting terminal; 41. Terminal; 42. Conductive column; 42a. Positive conductive column; 42b. Negative conductive column; 42c. Sensor conductive column;

[0070] 43. Buffer; 411. First through hole; 421. First column section; 422. Second column section; 431. Lower gasket; 432. Upper gasket.

[0071] 5. Positive electrode connecting plate; 6. Negative electrode connecting plate; 7. Positive electrode column; 8. Negative electrode column. DETAILED DESCRIPTION

[0072] Although the description of the present disclosure will be introduced in conjunction with some embodiments, this does not mean that the features of this application are limited to the implementation mode. On the contrary, the purpose of introducing the application in conjunction with the implementation mode is to cover other options or modifications that may be extended based on the claims of the present disclosure. In order to provide an in-depth understanding of the present disclosure, the following description will include many specific details. The present disclosure can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present disclosure, some specific details will be omitted in the description. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0073] In the embodiments of the present disclosure, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", "third", and "fourth" may explicitly or implicitly include one or more of the features.

[0074] In the description of the embodiments of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The directional terms mentioned in the embodiments of the present disclosure, such as "upper", "lower", "left", "right", "inside", "outside", etc., are only reference directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present disclosure, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present disclosure. "Multiple" means at least two.

[0075] The present embodiment relates to a battery. In current batteries, the sensor is located inside the shell, while the battery management unit is located outside the shell. Communication between the sensor and the battery management unit needs to be done through cables, and the cables passing through the battery cover will reduce the sealing of the battery.

[0076] In addition, the sensor is usually arranged near the cover plate, so that the data collected by the sensor (such as temperature) is the temperature near the cover plate and cannot reflect the internal state of the battery.

[0077] To solve the above problems, this embodiment provides a battery cover plate, which is integrated with a battery management unit. The battery management unit BMU can manage and balance the batteries and realize communication between the batteries and the battery management system BMS, thereby realizing the intelligence of a single battery.

[0078] The cell cover plate includes a connecting terminal, through which an electrical connection between the battery management unit and the sensor is achieved, and the connecting terminal is sealed and fixed in the plate body of the cell cover plate, thereby ensuring the sealing of the battery.

[0079] Furthermore, the terminals of the connection terminals have good insulation properties, thereby ensuring good insulation properties of the battery.

[0080] In addition, the sensor assembly included in the battery cover includes a diaphragm and a sensor. The sensor is fixed on the diaphragm, and the diaphragm is clamped between two battery cells, so that the sensor collects the internal state of the battery, thereby more accurately feeding back the internal state of the battery.

[0081] In addition, the battery management unit can also be connected to the positive and negative electrodes of the battery through the connecting terminals, and then powered by the battery.

[0082] The structural features of the battery cover will be introduced in detail below. To better understand the battery cover, the structural features of the battery in which the battery cover is located will be introduced before introducing the features of the battery cover.

[0083] like Figure 1 As shown, this is a schematic diagram of the explosion of a single battery. Figure 2 Shown is a schematic diagram of a single battery.

[0084] like Figure 1 As shown, the battery includes a cell cover plate 100, a cell module 200 and a shell module 300, wherein the shell module includes a first shell 301, a second shell 302 and a third shell 303. The cell module 200 includes a plurality of cells. Figure 1 In the example, the cell module 200 includes four cells. The cell module 200 also has a positive electrode tab 201 and a negative electrode tab 202. The positive electrodes of the multiple cells are connected to the positive electrode tab 201, and the negative electrodes of the multiple cells are connected to the negative electrode tab 202.

[0085] Continue to refer Figure 1 As shown, the shell module 300 includes a first shell 301, a second shell 302 and a third shell 303, wherein the first shell 301 is an insulating film to achieve insulation between the battery cell module 200 and the second shell 302 and the third shell 303 respectively, and the material of the first shell 301 can be polypropylene (PP), polyphenylenesulfide (PPS), polyethylene (PE) and polyethyleneglycol terephthalate (PET), etc.

[0086] like Figure 1 As shown, the first shell 301, the second shell 302 and the third shell 303 are all open box-shaped structures, and each includes an opening at the top. The battery module 200 is installed in the first shell 301, the first shell 301 is installed in the second shell 302, and the second shell 302 is installed in the third shell 303. The battery cover plate 100 is sealed and covered in the opening of the shell module 300, so as to form a Figure 2 A single battery is shown.

[0087] It should be noted that electrical equipment is usually powered by a battery pack, which includes Figure 2 The multiple batteries shown in the figure, the battery pack not only includes multiple batteries, but also includes a battery management system (battery management system, BMS) and a heat dissipation system, etc., wherein the battery management system is used to monitor the status of each battery and manage the charging and discharging process of each battery.

[0088] The above is an introduction to the main features of the battery. The following will introduce the structural features of the battery cell cover.

[0089] like Figure 3 As shown, it is a schematic diagram of the explosion of the battery cover. Figure 4 and Figure 5 The figure shows the schematic diagram of the assembled battery cover. Figure 3 As shown, the battery cover includes a plate body 1, a battery management unit 2, a sensor assembly 3 and a connection terminal 4, referring to Figure 4 and Figure 5 As shown, the battery management unit 2 is fixed on the board body 1, the sensor assembly 3 is fixed on the first surface 11 of the board body 1, and the connecting terminal 4 is fixed in the board body 1, wherein the first surface 11 of the board body 1 is the surface facing the battery cell module when the battery cell cover plate is covered in the opening of the shell module.

[0090] In one example, the battery management unit 2 includes a mainboard 21, a management chip (not shown in the figure), and a communication chip (not shown in the figure). The management chip is used to receive data sent by the sensor component 3 and perform some preliminary processing and judgment on the battery, such as whether the voltage of the battery exceeds the normal range, whether the temperature of the battery exceeds the normal range, and the management chip can also calculate the battery state of charge (SOC) and battery health state (SOH).

[0091] The communication chip is used to send data to the battery management system BMS, such as sending the status data of the battery. The communication between the battery management unit 2 and the battery management system BMS can be wireless communication, so the communication chip can be a wireless chip.

[0092] In one example, if Figure 4 As shown, the battery management unit 2 can be fixed on the second surface 12 of the board body 1, wherein the second surface 12 of the board body 1 is a surface opposite to the first surface 11, that is, a surface facing away from the battery cell module after the battery cell cover is closed in the opening of the shell assembly.

[0093] In another example, the battery management unit 2 can also be fixed in the board body 1. For example, the board body 1 is a hollow structure with a cavity, and the battery management unit 2 can be located in the cavity. In the solution where the battery management unit 2 is located in the cavity, the sealing of the battery can be enhanced.

[0094] For ease of introduction, in this embodiment, the battery management unit 2 is fixed on the second surface of the board 1 for example. Figure 4 As shown, the main board 21 of the battery management unit 2 is located on the second surface 12 of the board body 1 .

[0095] like Figure 3 And refer to Figure 4As shown, the main board 21 is located on the second surface 12 of the board body 1 and covers the top of the connecting terminal 4 so as to facilitate electrical connection between the main board 21 and the connecting terminal 4 .

[0096] like Figure 3 And refer to Figure 5 As shown, the sensor component 3 is located on the first surface 11 of the board body 1 and is fixed at the location of the connecting terminal 4 so as to facilitate electrical connection between the sensor component 3 and the connecting terminal 4 .

[0097] like Figure 6 As shown, it is a schematic diagram of the visible first surface 11 of the battery cover. Figure 6 As shown, the battery cover plate also includes a positive electrode connecting plate 5 and a negative electrode connecting plate 6 located on the first surface 11 of the plate body 1, wherein when the battery cover plate is covered in the shell assembly, the positive electrode connecting plate 5 contacts and is electrically connected to the positive electrode tab 201 of the battery cell module 200, and the negative electrode connecting plate 6 contacts and is electrically connected to the negative electrode tab 202 of the battery cell module 200.

[0098] Continue to refer Figure 6 As shown, the positive electrode connecting piece 5 is electrically connected to the connecting terminal 4, the negative electrode connecting piece 6 is electrically connected to the connecting terminal 4, and the connecting terminal 4 is electrically connected to the battery management unit 2, so the battery management unit 2 can be powered by the battery.

[0099] like Figure 7 As shown, it is a schematic diagram of the visible second surface 12 of the battery cover plate, and the battery cover plate also includes a positive electrode column 7 and a negative electrode column 8 located on the second surface 12 of the plate body 1, wherein one end of the positive electrode column 7 and the negative electrode column 8 are electrically connected to the positive electrode connecting plate 5 and the negative electrode connecting plate 6 respectively, and the other ends of the positive electrode column 7 and the negative electrode column 8 are connected to the power supply circuit of the battery pack to supply power to the electrical equipment where the battery pack is located.

[0100] In one example, the connection terminal 4 is sealed and fixed in the board body 1, for example, Figure 3 As shown, the board body 1 has an installation opening 13, and the connecting terminal 4 is sealed and fixed in the installation opening 13. Since the main board 21 is located on the second surface 12 of the board body 1 and the sensor component 3 is located on the first surface 11 of the board body 1, the installation opening 13 runs through the thickness of the board body 1.

[0101] This connection terminal 4 is sealed and fixed in the installation opening 13 of the board body 1, which can enhance the sealing of the battery. The following will introduce a solution for sealing the connection terminal 4 in the installation opening 13. Before introducing this solution, the structural features of the connection terminal 4 will be first introduced.

[0102] like Figure 8 As shown, it is an exploded schematic diagram of the connection terminal 4, such as Fig. 9 The schematic diagram of the connection terminal 4 after assembly is shown. Fig.10It is a cross-sectional schematic diagram showing that the connecting terminal 4 is installed in the installation opening 13 .

[0103] refer to Figure 8 As shown, the connection terminal 4 includes a terminal 41 and a plurality of conductive pillars 42, wherein the terminal 41 is an insulating terminal, for example, a ceramic terminal, and the specific material may be alumina ceramic, which has good insulation. The conductive pillar 42 is made of metal, such as copper or aluminum.

[0104] like Fig. 9 As shown, a plurality of conductive posts 42 are fixed in the terminal 41 , and both ends of the conductive posts 42 extend out of two surfaces of the terminal 41 , so that one end of the conductive post 42 can be connected to the battery management unit 2 , and the other end can be connected to the sensor assembly 3 .

[0105] For example, Figure 8 As shown, the terminal 41 is in a sheet shape and has a plurality of first through holes 411 extending through the thickness direction. The number of the first through holes 411 is the same as the number of the conductive pillars 42. Each conductive pillar 42 is located in a first through hole 411, and the two opposite ends of the conductive pillar 42 both extend out of the first through hole 411.

[0106] In order to improve the sealing performance of the battery, the conductive pillar 42 and the first through hole 411 through which the conductive pillar 42 passes are welded, for example, the conductive pillar 42 and the first through hole 411 are brazed.

[0107] In one example, if Figure 8 As shown, the shape of the conductive column 42 can be stepped, including a first column segment 421 and a second column segment 422, the diameter of the first column segment 421 is larger than the diameter of the second column segment 422, and the diameter of the first column segment 421 is larger than the aperture of the first through hole 411, and the diameter of the second column segment 422 is smaller than the aperture of the first through hole 411.

[0108] like Fig.10 As shown, the conductive pillars 42 are in a stepped shape, which can ensure that the lengths of the multiple conductive pillars 42 extending from the upper surface of the terminal 41 are equal, and the lengths extending from the lower surface of the terminal are also equal, so that one end of the multiple conductive pillars 42 is welded to the main board 21 of the battery management unit 2, and the other end of the multiple conductive pillars 42 is welded to the diaphragm 31 of the sensor assembly 3. In addition, the diameter of the first pillar section 421 is relatively large, which can also ensure that the end of the first pillar section 421 and the diaphragm 31 of the sensor assembly 3 have sufficient welding area.

[0109] In one example, in order to improve the sealing of the battery, the terminal 41 and the board body 1 are also connected by welding, for example, the edge of the terminal 41 and the installation opening 13 of the board body 1 are welded.

[0110] In one example, since the terminal 41 is made of ceramic and the plate 1 is made of metal, if the ceramic and the metal are directly welded, there will be a situation where the deformation of the ceramic and the metal is inconsistent, and the different deformation will reduce the sealing of the battery.

[0111] Accordingly, in order to improve the sealing between the terminal 41 and the mounting opening 13, continue to refer to Figure 8 As shown, the connecting terminal 4 may further include a buffer 43, which is annular in shape and may be made of 1060 aluminum. The terminal 41 is welded to the buffer 43 by brazing. The buffer 43 may be welded in the mounting port 13 of the plate body 1 by laser welding.

[0112] In order to improve the sealing performance of the connecting terminal 4 in the installation opening 13, accordingly, as Figure 8 And refer to Fig.10 As shown, the cross-section of the buffer 43 is in a semi-I-shape, including a lower gasket 431 and an upper gasket 432. Figure 7 And refer to Fig.10 As shown, the cross-sectional shape of the mounting opening 13 is stepped. Fig.10 As shown, the diameter of the installation opening 13 at the first surface 11 is smaller than that at the second surface 12, thereby forming a step 131. Fig.10 As shown, the lower surface of the lower gasket 431 of the buffer 43 is welded to the surface of the step 131 of the mounting opening 13 by laser welding, and the upper surface of the upper gasket 432 of the buffer 43 is welded to the lower surface of the terminal 41 by brazing.

[0113] In another example, because the buffer 43 is in a semi-I-shape, there is a gap between the upper gasket 432 and the lower gasket 431. Then, the step 131 of the mounting port 13 can be stuck in the gap, and the upper surface of the step 131 is welded to the lower surface of the upper gasket 432, and the lower surface of the step 131 is welded to the upper surface of the lower gasket 431.

[0114] Continue to refer Fig.10 As shown, the conductive column 42 is stepped, the upper surface of the first column section 421 of the conductive column 42 is in contact with the lower surface of the terminal 41, and the conductive column 42 is welded to the first through hole 411 of the terminal 41, so the conductive column 42 and the first through hole 411 are well sealed. Fig.10 As shown, the cross-sectional shape of the buffer 43 is a semi-I-shaped, and the cross-sectional shape of the mounting port 13 is a stepped shape. Then, the lower surface of the lower gasket 431 is welded together with the upper surface of the step 131, and the upper surface of the upper gasket 432 is welded together with the lower surface of the terminal 41, so that the connection terminal 4 and the mounting port 13 are well sealed.

[0115] It can be seen that the battery management unit 2 and the sensor assembly 3 are electrically connected through the connecting terminal 4, which can ensure that the sealing of the battery meets the requirements.

[0116] Regarding the number of conductive pillars 42, the conductive pillars 42 are mainly used to realize the electrical connection between the battery management unit 2 located outside the shell assembly and the device (such as a sensor) located inside the shell assembly. Therefore, the number of conductive pillars 42 is related to the number of components located inside the shell assembly and electrically connected to the battery management unit 2.

[0117] For example, the conductive pillars 42 are used to realize the electrical connection between the battery management unit 2 and the sensor, so the number of the conductive pillars 42 is related to the number of sensors. In order to form a closed loop, one sensor uses two conductive pillars 42 to be electrically connected to the battery management unit 2. If the sensor assembly 3 includes one sensor 32, the number of the conductive pillars 42 is two, and if the sensor assembly 3 includes two sensors 32, the number of the conductive pillars 42 is four.

[0118] For another example, as described above, the connection terminal 4 can also realize electrical connection between the battery management unit 2 and the positive electrode connection plate 5 and the negative electrode connection plate 6 respectively, so the number of conductive columns 42 is 2n+2, where n is the number of sensors 32, and n is an integer greater than or equal to 1.

[0119] In this embodiment, the sensor assembly 3 includes two sensors 32 for example. Figure 8 As shown, the number of the conductive pillars 42 is six, two of which are positive conductive pillars 42a and negative conductive pillars 42b, and the other four are sensor conductive pillars 42c.

[0120] The present embodiment does not specifically limit the number of the conductive pillars 42 , and the number can be flexibly set according to actual needs in applications.

[0121] Regarding the arrangement of the plurality of conductive pillars 42, refer to Figure 5 As shown, since the connecting terminal 4 is located between the positive connecting piece 5 and the negative connecting piece 6, and the sensor 32 is connected to the conductive column 42 through the diaphragm 31, in order to facilitate wiring, the arrangement of the multiple conductive columns 42 can be that the positive conductive column 42a is close to the positive connecting piece 5, the negative conductive column 42b is close to the negative connecting piece 6, and the multiple sensor conductive columns 42c are concentrated together.

[0122] It should be pointed out that, from the above, the terminal 41 needs to be welded to the conductive column 42 and the terminal 41 also needs to be welded to the buffer 43. Therefore, in order to facilitate welding, the terminal 41 can be metallized and then nickel-plated.

[0123] The above is about the structural features of the connecting terminal 4 and the sealing and fixing method of the connecting terminal 4 in the installation opening 13. The electrical connection between the connecting terminal 4 and the battery management unit 2 and the electrical connection between the connecting terminal 4 and the sensor 32 in the sensor assembly 3 will be introduced below.

[0124] like Fig.10 As shown, the first end of the conductive column 42 extends out of the first surface of the terminal 41, so the mainboard 21 of the battery management unit 2 and the conductive column 42 can be connected by plugging and then welded to achieve electrical connection.

[0125] For example, Fig.11 , which is a schematic diagram of the main board 21 of the battery management unit 2. The main board 21 has second through holes 211 that penetrate the thickness. The number of the second through holes 211 is the same as the number of the conductive pillars 42. Fig.11 As shown, each second through hole 211 has a pad 212 around it, then, as Fig.12 And refer to Fig.13 As shown, the main board 21 covers the connecting terminal 4, and the first end of each conductive column 42 is inserted into the second through hole 211 of the main board 21 and extends out of the second through hole 211, and the portion of the conductive column 42 extending out of the second through hole 211 is welded to the pad 212 around the second through hole 211, and the welding method can be wave soldering.

[0126] For example, as described above, the plurality of conductive columns 42 include a positive conductive column 42a, a negative conductive column 42b and a sensor conductive column 42c. Then, the first end of the positive conductive column 42a, the first end of the negative conductive column 42b and the first ends of the plurality of sensor conductive columns 42c are all inserted into the second through hole 211 and extend out of the second through hole 211, and the portions of the positive conductive column 42a, the negative conductive column 42b and the plurality of sensor conductive columns 42c extending out of the second through hole 211 are welded to the corresponding pads 212, thereby realizing electrical connection between the connection terminal 4 and the main board 21.

[0127] As can be seen from the above, the mainboard 21 and the connecting terminals 4 are connected by plugging, and the assembly method is simple.

[0128] The above is the connection method between the main board 21 of the battery management unit 2 and the connection terminal 4. The characteristics of the sensor component 3 and the electrical connection method between the sensor 32 and the connection terminal 4 will be introduced below.

[0129] like Fig.14 As shown, the structural features of the sensor assembly 3 are as follows: Fig.15 As shown, it is a schematic diagram of the sensor assembly 3 being located on the first surface 11 of the plate body 1. Fig.16 As shown, Fig.15 A magnified schematic diagram of local area A.

[0130] like Fig.14 FIG. 3 is a schematic diagram of the structure of a sensor assembly 3, wherein the sensor assembly 3 includes a diaphragm 31 and at least one sensor 32, and two sensors 32 are used as an example. Fig.14 As shown, the sensor 32 is fixed on the diaphragm 31, as shown in FIG. Fig.15 And refer to Fig.16 As shown, the diaphragm 31 is located on the first surface 11 of the board body 1 and fixed on the connecting terminal 4 , and the sensor 32 is electrically connected to the second end of the conductive column 42 .

[0131] like Fig.14 As shown, the membrane 31 includes a clamping sheet 311 and a connecting sheet 312, the connecting sheet 312 is connected to the clamping sheet 311, and the plane where the connecting sheet 312 is located is perpendicular to the plane where the clamping sheet 311 is located. The connecting sheet 312 and the clamping sheet 311 can be bent to achieve a perpendicular plane.

[0132] The connecting piece 312 has a pad, and the pad is electrically connected to the sensor 32 .

[0133] like Fig.16 As shown, the connecting piece 312 is located on the first surface 11 of the board 1 and covers a plurality of sensor conductive pillars 42c. The pads on the connecting piece 312 are welded one by one to the sensor conductive pillars 42c, thereby achieving a fixed connection between the diaphragm 31 and the board 1, and achieving an electrical connection between the sensor 32 and the sensor conductive pillars 42c.

[0134] Continue to refer Fig.14 As shown, at least one sensor 32 is fixed on a clamping sheet 311 , and the clamping sheet 311 is used to be clamped between two adjacent battery cells of the battery.

[0135] In this way, Fig.15 And refer to Fig.16 As shown, the second end of the positive conductive column 42a is connected to the positive connecting piece 5, the second end of the negative conductive column 42b is connected to the negative connecting piece 6, and the multiple sensor conductive columns 42c are welded to the multiple pads of the connecting piece 312 one by one.

[0136] In one example, at least one sensor 32 is fixed on the clamping sheet 311 of the diaphragm 31. For example, the diaphragm 31 may include a first sub-diaphragm and a second sub-diaphragm. The first sub-diaphragm and the second sub-diaphragm have the same area. The two are attached and bent to obtain the following: Fig.14 In the diaphragm 31 shown, at least one sensor 32 may be located between the first sub-diaphragm and the second sub-diaphragm, and the route between the sensor 32 and the pad of the connecting piece 312 may also be located between the first sub-diaphragm and the second sub-diaphragm.

[0137] In one example, since the clamping sheet 311 is clamped between two adjacent battery cells, the multiple battery cells usually have the same area (refer to Figure 1 As shown), in order to avoid the influence of the clamping sheet 311 on the adjacent battery cells, the area of ​​the clamping sheet 311 can be the same as the area of ​​the battery cells.

[0138] In this way, the sizes of the clamping piece 311 and the battery cell are the same, so that the pressure of the clamping piece 311 on the battery cell is equal everywhere, thereby avoiding the influence of uneven force on the battery cell.

[0139] In one example, the clamping sheet 311 may be clamped between two middle battery cells.

[0140] In one example, at least one sensor 32 may be located near the center of the clamping piece 311 .

[0141] In this way, at least one sensor 32 can collect the status at the center of the battery, thereby more accurately feeding back the status inside the battery.

[0142] In one example, there may be multiple sensor components 3 , and each clamping piece 311 is clamped between a pair of battery cells, thereby being able to monitor the status of multiple pairs of battery cells.

[0143] Based on the above, in this embodiment, the battery cover is integrated with a battery management unit. The battery management unit BMU can manage and balance the battery, and realize communication between the battery and the battery management system BMS, thereby realizing the intelligence of a single battery.

[0144] The cell cover plate includes a connecting terminal, through which an electrical connection between the battery management unit and the sensor is achieved, and the connecting terminal is sealed and fixed in the plate body of the cell cover plate, thereby ensuring the sealing of the battery.

[0145] Furthermore, the terminals of the connection terminals have good insulation properties, thereby ensuring good insulation properties of the battery.

[0146] In addition, the battery management unit can also be connected to the positive and negative electrodes of the battery through the connecting terminals, and then powered by the battery.

[0147] In addition, the sensor for monitoring the battery status is located on the diaphragm, and the diaphragm is sandwiched between two adjacent battery cells, so that the sensor can collect the internal status of the battery, thereby providing more accurate feedback on the internal status of the battery.

[0148] The present embodiment also provides a battery cell cover plate, which includes a plate body 1, a battery management unit 2 and a sensor assembly 3, wherein the sensor assembly 3, as described above, includes a diaphragm 31 and at least one sensor 32, at least one sensor 32 is fixed on the diaphragm 31, the diaphragm 31 is located on the first surface 11 of the plate body 1, and is used to be clamped between two adjacent battery cells of the battery, and the battery management unit 2 is fixed on the plate body 1 and is electrically connected to the at least one sensor 32.

[0149] The cell cover in this embodiment may include the connection terminals mentioned above, or may not include the connection terminals mentioned above.

[0150] Among them, the features of the board 1, the battery management unit 2 and the sensor assembly 3 can be found in the above description and will not be described in detail here.

[0151] In the battery cover of this embodiment, since the membrane 31 with the sensor 32 fixed thereon can be clamped between two battery cells, the sensor can collect the internal state of the battery, thereby more accurately feeding back the internal state of the battery.

[0152] This embodiment also provides a battery, see Figure 1 As shown, the battery includes a cell cover plate 100, a cell module 200 and a shell assembly 300. The cell cover plate 100 is the cell cover plate mentioned above. The cell module 200 is located in the shell assembly 300. The shell assembly 300 is an open shell with an opening at the top. The cell cover plate 100 is sealed and fixed in the opening of the shell assembly 300.

[0153] Among them, regarding the structural features of the battery cell cover plate 100, please refer to the above description and will not be repeated here.

[0154] Among them, the features of the battery cell module 200 and the features of the shell assembly 300 are all described above and will not be repeated here.

[0155] This embodiment also provides a battery pack, which includes a battery management system and a battery module. The battery module includes the battery described above, wherein the number of batteries is at least one, and there is a communication relationship between the battery management system and the battery management units of each battery.

[0156] This embodiment also provides an electrical device, which includes the battery pack described above.

[0157] The above description is only one embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A battery cell cover, characterized in that: The battery cell cover plate comprises a plate body (1), a battery management unit (2), a sensor assembly (3) and a connection terminal (4); The battery management unit (2) and the connection terminal (4) are both fixed on the board body (1), and the sensor component (3) is located on the first surface (11) of the board body (1); The battery management unit (2) and the sensor component (3) are electrically connected via the connecting terminal (4).

2. The cell cover plate according to claim 1, characterized in that: The connecting terminal (4) comprises a terminal (41) and a plurality of conductive pillars (42); The terminal (41) has a plurality of first through holes (411), the first through holes (411) and the conductive pillars (42) correspond one to one, each conductive pillar (42) is welded in the corresponding first through hole (411), and both ends extend out of the first through hole (411); The terminal (41) is fixed to the plate body (1), the battery management unit (2) is electrically connected to the first ends of the plurality of conductive pillars (42), and the sensor assembly (3) is electrically connected to the second ends of the plurality of conductive pillars (42).

3. The cell cover plate according to claim 2, characterized in that: The connecting terminal (4) further comprises an annular buffer (43), the buffer (43) and the plate body (1) are welded, and the terminal (41) and the buffer (43) are welded.

4. The cell cover plate according to claim 3, characterized in that: The cross-sectional shape of the buffer member (43) is a semi-I-shaped member, and comprises a lower gasket (431) and an upper gasket (432); The plate body (1) has a mounting opening (13), and the mounting opening (13) has a step (131) at a position close to the first surface (11) of the plate body (1); The lower surface of the lower gasket (431) and the upper surface of the step (131) are welded, and the upper surface of the upper gasket (432) and the lower surface of the terminal (41) are welded.

5. The cell cover plate according to any one of claims 2 to 4, characterized in that: The battery management unit (2) comprises a main board (21), the main board (21) having a plurality of second through holes (211), the second through holes (211) corresponding to the conductive pillars (42) one by one, and the main board (21) having a solder pad (212) arranged around each second through hole (211); The main board (21) covers the terminal (41), and the first end of each conductive column (42) extends out of the corresponding second through hole (211), and the extended portion is welded to the welding pad (212) around the second through hole (211).

6. The cell cover plate according to any one of claims 1 to 5, characterized in that: The cell cover plate further comprises a positive electrode connecting sheet (5) and a negative electrode connecting sheet (6), wherein the positive electrode connecting sheet (5) and the negative electrode connecting sheet (6) are both located on the first surface (11) of the plate body (1); The battery management unit (2) is electrically connected to the positive electrode connecting piece (5) and the negative electrode connecting piece (6) respectively through the connecting terminal (4).

7. The cell cover plate according to any one of claims 1 to 6, characterized in that: The sensor assembly (3) comprises a diaphragm (31) and at least one sensor (32), wherein the at least one sensor (32) is fixed on the diaphragm (31); The membrane (31) is located on the first surface (11) of the plate body (1) and is used to be sandwiched between two adjacent battery cells of the battery; The at least one sensor (32) is electrically connected to the connection terminal (4).

8. The cell cover plate according to claim 7, characterized in that: The diaphragm (31) comprises a clamping piece (311) and a connecting piece (312), wherein the clamping piece (311) and the connecting piece (312) are vertically connected; The at least one sensor (32) is fixed on the clamping sheet (311), and the clamping sheet (311) is used to be clamped between two adjacent battery cells of the battery; The connecting piece (312) is located on the first surface (11) of the board body (1), and a plurality of pads of the connecting piece (312) are welded one by one to a plurality of conductive columns (42) of the connecting terminal (4).

9. The cell cover plate according to claim 8, characterized in that: The length and width of the clamping piece (311) are respectively the same as the length and width of the battery cell in which it is located.

10. The battery cell cover plate according to claim 8 or 9, characterized in that: The at least one sensor (32) is located close to the center of the clamping piece (311).

11. A battery cell cover, characterized in that: The battery cell cover plate comprises a plate body (1), a battery management unit (2) and a sensor assembly (3); The sensor assembly (3) comprises a diaphragm (31) and at least one sensor (32), wherein the at least one sensor (32) is fixed on the diaphragm (31); The membrane (31) is located on the first surface (11) of the plate body (1) and is used to be sandwiched between two adjacent battery cells of the battery; The battery management unit (2) is fixed to the board body (1) and is electrically connected to the at least one sensor (32).

12. A battery, characterized in that: The battery comprises a cell module (200), a shell module (300) and a cell cover plate (100) according to any one of claims 1 to 11; The battery cell module (200) is located in the housing assembly (300), the housing assembly (300) has an opening, the battery cell cover plate (100) is sealed and fixed in the opening, and the first surface (11) of the battery cell cover plate (100) faces the battery cell module (200).

13. A battery pack, characterized in that: The battery pack includes a battery management system and a battery module, the battery module includes the battery according to claim 12, and a communication relationship exists between the battery management unit of the battery and the battery management system.

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