Battery assembly and electric equipment

Abstract

The utility model discloses a battery assembly and electric equipment, the battery assembly comprises a battery cell assembly and a circuit board, the battery cell assembly comprises a plurality of battery cells and a switch assembly, and the plurality of battery cells in the battery cell assembly are connected in series through the switch assembly; the battery cell assembly further comprises a first positive electrode connecting piece and a first negative electrode connecting piece, and electric connection of the circuit board and the battery cell assembly can be achieved by electrically connecting the first positive electrode connecting piece, the first negative electrode connecting piece and a first connecting part arranged on the circuit board. By arranging the switch assembly, the plurality of battery cells are connected in series, and welding of a part of positive electrode connecting pieces, a part of negative electrode connecting pieces and a circuit board is cancelled, so that the number of bonding pads on the circuit board is reduced, the arrangement space of components on the circuit board is larger, the component layout can be more dispersed, heat accumulation caused by spontaneous heating of the components is reduced, and the service life of the components is prolonged. And the performance of the battery assembly is improved.

Description

Technical Field

[0001] This application relates to the field of battery modules, and more specifically, to a battery module and an electrical device. Background Technology

[0002] In existing battery modules, a temperature switch is typically installed on each cell to protect it. Switches are common protective devices in battery modules. When the current from the device is too high or the cell temperature is too high, the switch disconnects, breaking the electrical connection between the battery module and the device, thus providing protection. When the cell temperature or current returns to normal, the switch reconnects, restoring the electrical connection between the battery module and the device. Therefore, the positive or negative tab of the cell is usually electrically connected to the circuit board via a switch. Current technology typically requires multiple solder pads on the circuit board to solder to the positive and negative tabs of each cell. Too many solder pads occupy a significant area of ​​the circuit board, compressing the component placement area and causing components to be clustered together, leading to heat accumulation and affecting the performance of the battery module. Utility Model Content

[0003] In order to solve at least one problem existing in the prior art, this application provides a battery assembly and an electrical device.

[0004] This application provides a switching assembly, including at least one battery cell assembly and a circuit board; the battery cell assembly includes a plurality of battery cells and at least one switching assembly, the switching assembly and two of the battery cells are electrically connected to connect the two battery cells in series; the battery cell assembly further includes a first positive terminal connector and a first negative terminal connector;

[0005] The circuit board is provided with a plurality of first connection portions, and the first positive electrode connector and the first negative electrode connector are respectively electrically connected to the first connection portions so that the circuit board and the battery cell assembly are electrically connected.

[0006] In some embodiments, the switch assembly includes a switch body having two connection terminals;

[0007] The switch assembly further includes a first connector and a second connector, one end of the first connector and one end of the second connector being electrically connected to the two connector ends respectively;

[0008] The other end of the first connector and the other end of the second connector are respectively electrically connected to two different battery cells.

[0009] In some embodiments, the switch assembly further includes a first sub-connection portion, one end of which is electrically connected to the first connector or the second connector;

[0010] The other end of the first sub-connector is electrically connected to the circuit board.

[0011] In some embodiments, the battery assembly further includes a first switching unit adapted to electrically connect the first positive electrode connector and the first connection portion; or the first switching unit is adapted to electrically connect the first negative electrode connector and the first connection portion.

[0012] In some embodiments, the battery cell has a sealing edge that protrudes from the end face of the battery cell to form a cavity, and at least a portion of the switch body is disposed within the cavity;

[0013] The first connector is provided with a clearance portion, which is adapted to avoid the sealing edge so that the first connector is adapted to be electrically connected to the adjacent battery cell.

[0014] In some embodiments, each of the plurality of battery cells is provided with a positive electrode connector and a negative electrode connector, at least a portion of the positive electrode connectors are electrically connected to the switching assembly, and at least a portion of the positive electrode connectors electrically connected to the switching assembly are disposed within the cavity; and / or

[0015] At least a portion of the negative electrode connector is electrically connected to the switch assembly, and at least a portion of the negative electrode connector electrically connected to the switch assembly is disposed within the cavity.

[0016] In some embodiments, the battery cell includes a housing that is energized; the battery cell also has a polarity connector with a polarity opposite to that of the housing, and the switching assembly is electrically connected to the housing of one of the battery cells and the polarity connector of the other battery cell, respectively, so that the two battery cells are connected in series.

[0017] In some embodiments, the battery assembly further includes an insulating element, the switching assembly being disposed on an end face of one of the battery cells; the insulating element is adapted to isolate the switching assembly and the housing of one of the battery cells so as to insulate the switching assembly and the housing of one of the battery cells from each other.

[0018] In some embodiments, the insulating member has a through hole, and the polarity connector is adapted to be electrically connected to the switching assembly through the through hole.

[0019] In some embodiments, the battery assembly includes a plurality of the battery cell assemblies, each of which is electrically connected to the circuit board to connect the plurality of battery cell assemblies in series and / or in parallel.

[0020] In some embodiments, the battery assembly further includes a third connector, the two ends of which are respectively connected to the switch assembly and the circuit board, so that the circuit board and the switch assembly are electrically connected.

[0021] In some embodiments, the switch body is a temperature switch.

[0022] This application also provides an electrical device, including the battery assembly provided in this application.

[0023] The battery assembly of this application enables two cells to be connected in series in the battery assembly by setting a switching assembly, thereby eliminating the need for soldering of some positive electrode connectors, negative electrode connectors and circuit boards. This reduces the number of solder pads on the circuit board, allowing for more space for component placement and a more dispersed component layout. This reduces heat accumulation caused by self-heating of components and improves the performance of the battery assembly.

[0024] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0026] Figure 1 This is a schematic diagram of a switching component according to certain embodiments of this application;

[0027] Figure 2 This is a schematic diagram of a switching component according to certain embodiments of this application;

[0028] Figure 3 This is a schematic diagram of a switching component according to certain embodiments of this application;

[0029] Figure 4 This is a schematic diagram of a battery cell assembly according to certain embodiments of this application;

[0030] Figure 5 This is a schematic diagram of a battery cell assembly according to certain embodiments of this application;

[0031] Figure 6 This is a schematic diagram of a battery assembly according to certain embodiments of this application;

[0032] Figure 7 This is a partially enlarged schematic diagram of a battery assembly according to certain embodiments of this application;

[0033] Figure 8 This is a schematic diagram of a battery assembly according to certain embodiments of this application.

[0034] Explanation of key component symbols:

[0035] 10-Switch assembly; 110-First connector; 120-Second connector; 130-Switch body; 111-First sub-connection; 112-Second sub-connection; 113-Third sub-connection; 114-Allowing part; 20-Soft-pack battery cell; 21-First soft-pack battery cell; 22-Second soft-pack battery cell; 201-Soft-pack first positive connector; 202-Soft-pack first negative connector; 210-Soft-pack positive connector; 220-Soft-pack negative connector; 230-Edge sealing; 231 -Cavity; 50-First switch assembly; 40-Steel-cased cell; 41-First steel-cased cell; 42-Second steel-cased cell; 410-Steel-cased positive electrode connector; 60-Insulator; 420-Casing; 100-Soft-pack cell assembly; 400-Steel-cased cell assembly; 1000-Battery assembly; 300-Circuit board; 300-First connecting part; 301-Second connecting part; 302-Third connecting part; 303-Fourth connecting part; 304-Second sub-connector; 500-Cell assembly. Detailed Implementation

[0036] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of this application, and should not be construed as limiting the embodiments of this application.

[0037] In existing battery packs, a switch is typically installed on each cell to protect it. Switches are common protective devices in battery packs; when the current from the device is too high or the cell temperature is too high, the switch disconnects, breaking the electrical connection between the battery pack and the device, thus providing protection. When the cell temperature or current returns to normal, the switch reconnects, restoring the electrical connection between the battery pack and the device. Therefore, the positive or negative tab of the cell is usually electrically connected to the circuit board via a switch; one end of the switch is connected to the tab, and the other end is soldered to pads on the circuit board. Current technology typically requires multiple pads on the circuit board connected to the positive and negative tabs of each cell, and then the cells are connected in series or parallel via circuit board traces. However, too many pads on the circuit board occupy a significant area, reducing the area for component placement. This leads to concentrated component placement, causing heat accumulation and further reducing the performance of the battery pack.

[0038] To address the aforementioned issues, this patent proposes a battery assembly, comprising a cell assembly and a circuit board. The cell assembly includes at least two cells and at least one switching assembly. The switching assembly is electrically connected to the two cells to connect them in series. Further explanation is provided: all cells within the cell assembly are connected in series via the switching assembly. The cell assembly also includes a first positive electrode connector and a first negative electrode connector. The circuit board has several first connection portions. The first positive electrode connector and the first negative electrode connector serve as polarity components of the cell assembly. Electrical connection between the cell assembly and the circuit board is achieved through the electrical connection between the first positive electrode connector, the first negative electrode connector, and the first connection portions. The series connection of multiple cells within the battery cell assembly and the protection function of the cells can be realized by using a switching component. The battery cell assembly only needs to electrically connect the first positive terminal connector, the first negative terminal connector and the circuit board to realize the electrical connection between multiple cells and the circuit board. The number of first connection parts required on the circuit board is reduced, the area available for component placement is increased, the components can be arranged more dispersedly, and the heat generated by the components will not be too concentrated. In addition, the overcurrent pressure of the circuit board can be reduced, and the heat generation of the circuit board can be reduced, thereby improving the reliability and related performance of the battery assembly.

[0039] The contents of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can have a clearer and more detailed understanding of the contents of this application.

[0040] In some embodiments, reference Figure 1 The switch assembly 10 includes a switch body 130, a first connector 110, and a second connector 120. The switch body 130 has two connection ends, which are respectively connected to the first connector 110 and the second connector 120, realizing the electrical connection between the first connector 110, the second connector 120, and the switch body 130. It should be noted that the two connection ends of the switch body 130 can be metal parts, such as copper sheets as shown in the figure. Any metal part that meets the welding requirements can be used as a connection end, and no specific restrictions are made here.

[0041] In some embodiments, the switch assembly 10 further includes a first sub-connection portion 111, which can be electrically connected to the circuit board 30, thereby enabling the switch assembly 10 and the circuit board 30 to be electrically connected. This allows the circuit board 30 to collect relevant data such as the potential of the switch assembly 10. Please refer to... Figure 2 and Figure 6The first sub-connector 111 can be integrally formed as part of the first connector 110, protruding from the first connector 110 to facilitate electrical connection between the first sub-connector 111 and the circuit board 30. It should be noted that the first sub-connector 111 can also be located on the second connector 120, as long as the circuit board 30 can collect data such as the potential of the switching assembly 10; no specific restrictions are imposed here. In battery assemblies, sampling points are typically set on each cell to sample relevant performance characteristics, such as voltage, so that the protection board or BMS can collect and analyze relevant data from each cell in a timely manner, ensuring the safety of the battery assembly. After the first sub-connector 111 is electrically connected to the external circuit, the external circuit can collect the potential data of the first connector 110 and analyze the voltage of the cell using the potential data, further ensuring the electrical safety of the battery assembly.

[0042] The current industry trend is to maximize the energy density of battery modules to enhance product competitiveness. Therefore, in existing battery module designs, multiple cells are typically arranged in a regular, parallel pattern. This regular and compact arrangement effectively increases the energy density of the battery module. In this application, a battery module has a first connector 110 and a second connector 120 electrically connected to different cells. Therefore, the shapes of the first connector 110 and the second connector 120 need to be designed to match the positional relationship of the cells, so that the first connector 110 and the second connector 120 provide sufficient connection strength while minimizing material costs, preventing desoldering during operation. Existing cells are generally pouch cells or steel-cased cells. Therefore, this application also provides a cell assembly 500, which includes a pouch cell assembly 100 and a steel-cased cell assembly 400. The switching assembly of this application will be further described below according to different types of cells.

[0043] This application provides a pouch cell assembly 100, including a plurality of pouch cells 20. The pouch cell 20 housings are non-conductive. In the prior art, a sealing edge 230 is typically provided on the pouch cell 20 to heat-seal the boundary, thereby sealing the cell and preventing leakage. The sealing edge 230 protrudes from one end of the pouch cell 20 and forms a cavity 231. Please refer to... Figure 4To maximize the energy density of the battery assembly, at least a portion of the switch body 130 is disposed within the cavity 231, further improving the space utilization of the cavity 231. Each pouch cell 20 typically has a positive tab 210 and a negative tab 220 as positive and negative connectors, respectively. The positive tab 210 and negative tab 220 extend from the cell via the sealing edge 230 to facilitate electrical connection with other components. In the prior art, insulating adhesive 203 is usually applied between the tab and the sealing edge 230 to insulate the tab and sealing edge 230, thereby improving the cell's protection performance.

[0044] The switch body 130 can be installed inside any slot of the pouch cell 20. Please refer to [reference needed]. Figure 4 The pouch cell 20 includes a first pouch cell 21 and a second pouch cell 22. The switch assembly 10 can be disposed within the cavity 231 of the first pouch cell 21 or within the cavity 231 of the second pouch cell 22. The switch body 130 is disposed within the cavity 231 of the first pouch cell 21 and connected to the positive electrode tab 210 of the first pouch cell 21, at which time the switch body 130 exhibits positive polarity. Similarly, if the switch body 130 is disposed within the cavity 231 of the second pouch cell 22 and connected to the negative electrode tab 220 of the second pouch cell 22, then the switch body 130 exhibits negative polarity. In the prior art, the cross-section of the aluminum-plastic film used for edge sealing has a metal layer and a plastic layer during cutting. The metal layer poses a risk of electrochemical corrosion upon contact with the negative electrode tab. If the switch body 130 is disposed within the cavity 231 of the second flexible battery cell 22 and electrically connected to the negative electrode tab 220 of the second flexible battery cell 22, the switch body 130 will be negatively polarized and prone to electrochemical corrosion with the edge sealing 230. Therefore, the preferred solution of this application is to dispose of the switch body 130 within the cavity 231 of the first flexible battery cell 21 and electrically connect it to the positive electrode tab 210 of the first flexible battery cell 21 to prevent electrochemical corrosion of the metal layer of the edge sealing 230. It should be noted that if the edge sealing 230 is properly insulated, the switch body 130 can also be disposed within the cavity 231 of the second flexible battery cell 22 and electrically connected to the negative electrode tab 220 of the second flexible battery cell 22.

[0045] In some embodiments, when the battery cell is a pouch cell 20, the first connector 110 further includes a second sub-connector 112 and a third sub-connector 113, so as to facilitate better electrical connection of the first connector 110 to the negative electrode tab 220 of the second pouch cell 22. (See reference) Figure 2 and Figure 4The second sub-connection portion 112 extends toward the first direction X so that the second sub-connection portion 112 can approach the negative electrode tab 220 of the second soft-pack battery cell 22. The third sub-connection portion 113 extends toward the second direction Y so that the third sub-connection portion 113 can be electrically connected to the connection end of the switch body. The first direction X and the second direction Y have an angle so that the first connector 110 can connect the connection end of the switch body and the negative electrode tab 120 respectively. In some embodiments, the second connection portion 112 and the third connection portion 113 can also form a clearance portion 114 so that the first connector 110 can avoid the sealing edge 230 of the first soft-pack battery cell 21 and the second soft-pack battery cell 22, which makes the installation of the first connector 110 easier and saves the material cost of the first connector 110.

[0046] This application also provides a soft-pack battery cell assembly 100. When multiple cells are connected in series, a first positive terminal connector 201 and a first negative terminal connector 202 are required for electrical connection to an external circuit, more specifically, for electrical connection to a circuit board 30, to achieve the charging and discharging function of the battery assembly. When multiple cells are arranged in a row, the positive and negative terminals of the two cells at the beginning and end of the row are typically designated as the first positive terminal connector 201 and the first negative terminal connector 202. To protect each cell, a conventional first switch unit 50 is also required at the first positive terminal connector 201 or the second negative terminal connector 202 to protect cells whose cell cavity does not have the switch unit of this application. Please refer to... Figure 4 The positive terminal connector of the second pouch cell 22 serves as the first positive terminal connector 201. Since the cavity 231 of the second pouch cell 22 does not have a switch assembly 10, a first switch unit 50 needs to be installed at the first positive terminal connector 201. This ensures that when the temperature of the second pouch cell 22 is too high, the first switch unit 50 can promptly disconnect the electrical connection between the pouch cell assembly 100 and the external circuit. It should be noted that the first switch unit 50 is a conventional switch assembly used to electrically connect the electrode tabs and the external circuit. When the temperature of the second pouch cell 22 itself is too high, the temperature of the first switch unit 50 will rise, thus disconnecting it.

[0047] In some embodiments, to accommodate specific cell arrangements, the cells can be connected in series, and the switch assembly 10 can also be designed accordingly. Please refer to [reference needed]. Figure 3 The second sub-connector 112 extends toward the second connector 120. The size and shape of the first connector 110 and the second connector 120 can be designed in various ways according to the arrangement of the battery cells to realize the series connection of the battery cells.

[0048] This application also provides a steel-cased battery cell assembly 400, including a plurality of steel-cased battery cells 40. The casing of the steel-cased battery cell 40 can be charged, thereby allowing the casing 420 to serve as the negative electrode connector of the steel-cased battery cell 40. In the prior art, the positive electrode connector 410 of the steel-cased battery cell is generally a rivet or a positive electrode post. Of course, in some embodiments, the casing 420 can also be positively charged, and a corresponding negative electrode post or negative electrode rivet can be configured; this is not limited here. Please refer to... Figure 5 The steel-cased battery cell 40 includes a first steel-cased battery cell 41 and a second steel-cased battery cell 42. The switch body 130 of this application can be disposed at the end of the first steel-cased battery cell 41. The first connector 110 and the housing 420 of the second steel-cased battery cell 42 are electrically connected. The second connector 120 and the positive terminal connector 410 of the first steel-cased battery cell 41 are electrically connected. In some embodiments, to avoid a short circuit caused by the electrical connection between the switch body 130 and the housing 420 of the first steel-cased battery cell 41, an insulating member 60 is provided between the switch assembly 10 and the first steel-cased battery cell 41 to prevent electrical connection between the switch assembly 10 and the housing 420 of the first steel-cased battery cell 41. In some embodiments, refer to... Figure 5 The insulating component 60 can be provided with a through hole. The steel shell positive electrode connector 410 can be electrically connected to the second connector 120 through the through hole. At this time, when the second connector 120 and the steel shell positive electrode connector 410 are welded, the second connector 120 can completely cover the steel shell positive electrode connector 410 to make the welding more reliable.

[0049] In some embodiments, the circuit board 30 is provided with a plurality of first connection portions 300. Each first connection portion 300 may be a solder pad on the circuit board 30. The first sub-connection portion 111, the first positive electrode connector 201, the first negative electrode connector 202, the steel shell positive electrode connector 410, and the housing 420 can all be electrically connected to the first connection portions 300 to achieve electrical connection between the battery cell assembly and the circuit board. (Reference) Figures 4-6 The first connecting part 300 includes a second connecting part 301 and a third connecting part 302. The second connecting part 301 is electrically connected to the first switching unit 50 to realize the electrical connection between the first positive electrode connector 201 and the circuit board 30. The first negative electrode connector 202 and the third connecting part 302 are welded to realize the electrical connection between the first negative electrode connector 202 and the circuit board. The housing 420 can also be electrically connected to the third connecting part 302 through a metal part, and no specific limitation is made here.

[0050] In some embodiments, please refer to Figure 6 The first connecting part 300 also includes one or more fourth connecting parts 303, and the first connecting member 110 also includes a first sub-connecting member 111. After the first sub-connecting member 111 and the fourth connecting part 303 are electrically connected, the circuit board can collect the corresponding potential data and obtain data such as the voltage of the battery cell accordingly.

[0051] In some embodiments, please refer to Figure 7 The battery assembly 1000 also includes a third connector 304, which is adapted to connect the switch assembly 10 and the circuit board 30 to make the circuit board 30 and the switch assembly 10 electrically connected. Through the third connector 304, the circuit board 30 can collect the potential data of the switch assembly, improving the safety performance of the battery assembly 1000. It should be noted that the third connector 304 can be a metal strip; materials such as nickel, copper, and silver can all be used as the third connector 304. No specific restrictions are placed on the material of the third connector 304, as long as it enables the circuit board 30 to sample the switch assembly 10.

[0052] It should be noted that the battery assembly 1000 may include multiple cell assemblies 500, which can be connected in series or parallel via the circuit board 30. Please refer to [reference needed]. Figure 8 The battery assembly 1000 includes two cell assemblies 500, both of which are electrically connected to the circuit board 30. The two cell assemblies 500 can be connected in series or in parallel through the wiring of the circuit board 30, thereby expanding the current or capacity of the battery assembly 1000.

[0053] In some embodiments, to prevent the positive tab 210 and negative tab 220, which are electrically connected to the switch assembly 10, from blocking the circuit board 30, the positive tab 210 and negative tab 220 connected in series through the switch assembly 10 are usually flipped or folded so that at least part of the positive tab 210 and negative tab 22 are disposed in the cavity 231, so that the components on the circuit board will not rub against the positive tab 210 or negative tab 22, thereby improving the safety performance of the battery assembly 1000.

[0054] It should be noted that both the first connector 110 and the second connector 120 in this application need to be able to conduct electricity.

[0055] Furthermore, the first connector 110 and the second connector 120 can be metal parts, such as nickel sheets or copper sheets. Other conductive parts that can achieve electrical connection can also be used as the first connector 110 and the second connector 120, without specific limitations.

[0056] The switch body provided in this application can be a temperature switch. When the temperature of the battery cell itself rises, the temperature of the switch body near the battery cell will rise. When the temperature of the switch body is too high, it will disconnect, thereby disconnecting the series connection of the battery cells and improving the safety performance of the battery pack.

[0057] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0058] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery assembly, characterized in that, include: At least one battery cell assembly; the battery cell assembly includes a plurality of battery cells and at least one switching assembly, the switching assembly being electrically connected to two of the battery cells to connect the two battery cells in series; The battery cell assembly is also provided with a first positive electrode connector and a first negative electrode connector; The circuit board has a plurality of first connection portions, and the first positive electrode connector and the first negative electrode connector are electrically connected to the first connection portions respectively, so that the circuit board and the battery cell assembly are electrically connected.

2. The battery assembly according to claim 1, characterized in that, The switch assembly includes a switch body, and the switch body has two connection terminals; The switch assembly further includes a first connector and a second connector, one end of the first connector and one end of the second connector being electrically connected to the two connector ends respectively; The other end of the first connector and the other end of the second connector are respectively electrically connected to two different battery cells.

3. The battery assembly according to claim 2, characterized in that, The switch assembly further includes a first sub-connection portion, one end of which is electrically connected to the first connector or the second connector; The other end of the first sub-connector is electrically connected to the circuit board.

4. The battery assembly according to claim 1, characterized in that, The battery assembly further includes a first switching unit, which is adapted to electrically connect the first positive electrode connector and the first connecting portion; or the first switching unit is adapted to electrically connect the first negative electrode connector and the first connecting portion.

5. The battery assembly according to claim 2, characterized in that, The battery cell has a sealing edge, which protrudes from the end face of the battery cell to form a cavity, and at least part of the switch body is disposed in the cavity; The first connector is provided with a clearance portion, which is adapted to avoid the sealing edge so that the first connector is adapted to be electrically connected to the adjacent battery cell.

6. The battery assembly according to claim 5, characterized in that, Each of the plurality of said battery cells is provided with a positive electrode connector and a negative electrode connector, at least a portion of said positive electrode connectors are electrically connected to said switching assembly, and at least a portion of said positive electrode connectors electrically connected to said switching assembly are disposed within said cavity; and / or At least a portion of the negative electrode connector is electrically connected to the switch assembly, and at least a portion of the negative electrode connector electrically connected to the switch assembly is disposed within the cavity.

7. The battery assembly according to claim 2, characterized in that, The battery cell includes a housing, which is charged; the battery cell also has a polarity connector with the opposite polarity to the housing, and the switching assembly is electrically connected to the housing of one of the battery cells and the polarity connector of the other battery cell, so that the two battery cells are connected in series.

8. The battery assembly according to claim 7, characterized in that, The battery assembly further includes an insulating element, and the switching assembly is disposed on the end face of one of the battery cells; the insulating element is adapted to isolate the switching assembly and the housing of one of the battery cells so as to insulate the switching assembly and the housing of one of the battery cells from each other.

9. The battery assembly according to claim 8, characterized in that, The insulating member has a through hole, and the polarity connector is adapted to be electrically connected to the switch assembly through the through hole.

10. The battery assembly according to claim 1, characterized in that, The battery assembly includes a plurality of battery cell assemblies, and the plurality of battery cell assemblies are electrically connected to the circuit board to connect the plurality of battery cell assemblies in series and / or in parallel.

11. The battery assembly according to claim 1, characterized in that, The battery assembly further includes a third connector, the two ends of which are respectively connected to the switch assembly and the circuit board, so that the circuit board and the switch assembly are electrically connected.

12. The battery assembly according to claim 2, characterized in that, The switch body is a temperature switch.

13. An electrical appliance, characterized in that, include: The battery assembly according to any one of claims 1-12.

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