Battery assembly, battery pack, and electronic device

Abstract

This application discloses a battery assembly, battery pack, and electronic device. The battery assembly includes a battery cell and a battery protection board. The battery protection board includes a protection board body and a mechanical protection switch. The protection board body is located at a predetermined end of the battery cell and is electrically connected to the battery cell's tabs. The mechanical protection switch is integrated onto the protection board body and is electrically connected to the protection board body. The mechanical protection switch has an open state and a closed state. When the mechanical protection switch is in the open state, the current circuit between the battery cell and the protection board body is broken. When the mechanical protection switch is in the closed state, the current circuit between the battery cell and the protection board body is connected. Since the mechanical protection switch does not require additional steps to connect to the protection board body and the battery cell's tabs, the battery assembly process is simplified, and the battery production efficiency is improved to a certain extent.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery component, battery pack, and electronic device. Background Technology

[0002] Currently, most electronic devices such as mobile phones and tablets are powered by batteries. The battery usually has an integrated battery protection board, which can protect the battery during charging and discharging to avoid problems such as overcharging, over-discharging, and short circuits.

[0003] In related technologies, to further improve battery installation performance, mechanical protection switches are installed at the tabs of the battery cells. These switches can disconnect the circuit between the cell and the battery protection board in case of overheating or overcurrent. The mechanical protection switch and the battery protection board provide dual protection for the cell. However, because the mechanical protection switch needs to be soldered onto the cell's tabs through a separate process before being connected to the battery protection board, the assembly process is relatively complex, reducing battery production efficiency to some extent. Utility Model Content

[0004] This application discloses a battery component, battery pack, and electronic device to solve the problem of complex assembly processes between mechanical protection switches, battery cells, and battery protection boards in related technologies.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application disclose a battery assembly, which includes a battery cell and a battery protection board; the battery protection board includes a protection board body and a mechanical protection switch, the protection board body is disposed at a predetermined end of the battery cell and electrically connected to the electrode tab of the battery cell, and the mechanical protection switch is integrated on the protection board body and electrically connected to the protection board body;

[0007] The mechanical protection switch has an open state and a closed state. When the mechanical protection switch is in the open state, the current circuit between the battery cell and the protection board body is broken. When the mechanical protection switch is in the closed state, the current circuit between the battery cell and the protection board body is connected.

[0008] Secondly, embodiments of this application disclose a battery pack, which includes a battery pack housing and the aforementioned battery assembly, wherein the battery assembly is installed in the battery pack housing.

[0009] Thirdly, this application discloses an electronic device, which includes a device housing and the aforementioned battery assembly, wherein the battery assembly is installed in the device housing.

[0010] The technical solution adopted in this application can achieve the following technical effects:

[0011] The battery assembly disclosed in this application improves upon related technologies. The disclosed battery assembly includes a battery cell and a battery protection board. The battery protection board includes a protection board body and a mechanical protection switch. By integrating the mechanical protection switch onto the protection board body, and then placing the protection board body at a predetermined end of the battery cell and electrically connecting it to the battery cell's tabs, the battery protection board and battery cell can be assembled. The protection board body and the mechanical protection switch provide dual protection for the battery cell, thereby improving battery safety performance. Since the mechanical protection switch does not require additional steps to connect to the protection board body and the battery cell's tabs, the battery assembly process is simplified, improving battery production efficiency to some extent. Furthermore, the mechanical protection switch does not require additional space at the predetermined end of the battery cell, freeing up more space for battery cell placement and thus increasing battery capacity. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the battery assembly structure disclosed in the embodiments of this application;

[0013] Figure 2 for Figure 1 Enlarged view of point a in the middle;

[0014] Figure 3 This is a schematic diagram of the temperature protection switch disclosed in an embodiment of this application.

[0015] Explanation of reference numerals in the attached figures:

[0016] 110-Battery cell, 111-Positive tab, 112-Negative tab, 120-Battery protection board, 121-Protection board body, 1211-Printed circuit board, 1211a-Extension, 1211b-Koiled area, 1211c-Power supply contact, 1212-Flexible circuit board, 122-Mechanical protection switch, 1221-Housing, 1222-First conductive element, 1222a-First conductive part, 1222b-First connecting part, 1223-Second conductive element, 1223a-Second conductive part, 1223b-Second connecting part, 1224-Thermistor. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0018] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more.

[0019] The technical solutions disclosed in the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0020] Please refer to Figures 1 to 3 This application discloses a battery assembly, which includes a battery cell 110 and a battery protection board 120. The battery cell 110 has tabs, which are metal conductors that lead out the positive and negative terminals from the battery cell 110. The battery protection board 120 may include a protection board body 121 and a mechanical protection switch 122. The protection board body 121 is disposed at a predetermined end of the battery cell 110 and is electrically connected to the tabs of the battery cell 110. The predetermined end of the battery cell 110 may be the end of the battery cell 110 with the tabs. The protection board body 121 has an electrical connection portion for electrical connection with the tabs of the battery cell 110. The protection board body 121 can be welded and fixed to the tabs of the battery cell 110 through the electrical connection portion, thus achieving electrical connection. The protection board body 121 can protect the battery cell 110 during the charging and discharging process to prevent the battery cell 110 from being in an overcharged state, over-discharged state, overcurrent state, short circuit state, or over-temperature charging and discharging state. The protection board body 121 is equipped with devices such as a control IC (integrated circuit) and MOS (MOSFET, metal-oxide-semiconductor field-effect transistor). The control IC is the core of the protection board body 121 and is responsible for monitoring the voltage and current of the battery cell 110. When the voltage or current exceeds the set value, the control IC will control the opening and closing of the MOS switch to protect the battery cell 110.

[0021] The aforementioned mechanical protection switch 122 is integrated onto the protection board body 121 and is electrically connected to the protection board body 121. When manufacturing the protection board body 121, a dedicated mounting position for the mechanical protection switch 122 can be designed on the protection board body 121. Then, the mechanical protection switch 122 is assembled and fixed to the protection board body 121 by welding, conductive bonding, or other methods. From a circuit perspective, the mechanical protection switch 122 is actually connected in series in the current loop between the protection board body 121 and the battery cell 110. Compared to related technologies where the mechanical protection switch is welded separately to the battery protection board and the electrode tabs, in this application, the mechanical protection switch 122 does not require additional installation procedures. The function of the mechanical protection switch 122 can be normally realized simply by connecting the protection board body 121 to the electrode tabs of the battery cell 110.

[0022] The mechanical protection switch 122 operates on the following principle: it has an open state and a closed state. When the mechanical protection switch 122 is in the open state, the current circuit between the battery cell 110 and the protection board body 121 is broken, thus blocking the current. When the mechanical protection switch 122 is in the closed state, the current circuit between the battery cell 110 and the protection board body 121 is connected, allowing the current to flow normally and ensuring the normal charging and discharging of the battery cell. In practical applications, when the battery cell 110 experiences overheating or overcurrent, the mechanical protection switch 122 can be controlled to be in the open state to block the current between the battery cell 110 and the protection board body 121, thus protecting the battery cell 110—this is the first layer of protection. Furthermore, combined with the second layer of protection provided by the protection board body 121, the battery's safety performance is further enhanced under this dual protection.

[0023] As described above, the battery assembly disclosed in this application improves upon related technologies. The disclosed battery assembly includes a battery cell 110 and a battery protection board 120. The battery protection board 120 includes a protection board body 121 and a mechanical protection switch 122. By integrating the mechanical protection switch 122 onto the protection board body 121, and then placing the protection board body 121 at a predetermined end of the battery cell 110 and electrically connecting it to the tab of the battery cell 110, the battery protection board 120 and the battery cell 110 can be assembled. The protection board body 121 and the mechanical protection switch 122 can provide dual protection for the battery cell 110, thereby improving the battery's safety performance. Since the mechanical protection switch 122 does not require additional steps to connect to the protection board body 121 and the tab of the battery cell 110, the battery assembly process is simplified, improving battery production efficiency to a certain extent. Furthermore, the mechanical protection switch 122 does not require additional space at the predetermined end of the battery cell 110, freeing up more space for the battery cell 110 and thus increasing battery capacity.

[0024] like Figure 1 and Figure 2 As shown, to facilitate the installation of the mechanical protection switch 122, the protection board body 121 has an extension 1211a on the side near the battery cell 110. The mechanical protection switch 122 can be connected to the extension 1211a by welding, conductive bonding, or other methods. The mechanical protection switch 122 can be arranged on the surface of the extension 1211a or embedded inside the extension 1211a.

[0025] Considering that directly mounting the mechanical protection switch 122 on the surface of the extension 1211a would result in a large protrusion, which would hinder the thinning of the protection plate body 121, therefore, as follows... Figure 1 and Figure 2 As shown, a hollow area 1211b can be formed on the extension 1211a, and power supply contacts 1211c are respectively provided on both sides of the hollow area 1211b. The power supply contacts 1211c are used to transmit current or signals in the electrical system to ensure a stable connection between devices or circuits. The main body of the mechanical protection switch 122 can be embedded in the hollow area 1211b, thereby solving the problem of the large protrusion size of the mechanical protection switch 122 on the surface of the extension 1211a. The mechanical protection switch 122 has a first conductive end and a second conductive end, which are electrically connected to the power supply contacts 1211c on both sides of the hollow area 1211b, respectively. The specific electrical connection method can be welding, conductive bonding, etc.

[0026] like Figure 1 and Figure 2 As shown, the protection board body 121 may include a printed circuit board 1211 and a flexible circuit board 1212. The printed circuit board 1211 is the carrier for electrical interconnection between electronic components. Various components are disposed on the printed circuit board 1211, such as control ICs, MOS switches, capacitors, fuses, PTC (Positive Temperature Coefficient) thermistors, NTC (Negative Temperature Coefficient) thermistors, and memory. The printed circuit board 1211 is electrically connected to the tabs of the battery cell 110, and the mechanical protection switch 122 is disposed on the printed circuit board 1211.

[0027] The control IC is the core of the protection board, responsible for monitoring battery voltage and current. When the voltage or current exceeds the set value, the control IC controls the opening and closing of the MOS switch to protect the battery. Capacitors are used to stabilize voltage, filter, or store energy to ensure stable circuit operation. When the current abnormally rises to a certain level, the fuse will blow, cutting off the circuit and preventing the battery from overheating or being damaged. In high-temperature environments, the resistance of the PTC increases sharply, limiting the current and preventing battery overheating. When the ambient temperature rises, the resistance of the NTC decreases, used to monitor battery temperature and control the charging and discharging process. The memory stores the settings of the battery protection board 120, such as overcharge, over-discharge, and overcurrent protection thresholds. These components work together to ensure battery safety during charging and discharging, preventing problems such as overcharging, over-discharging, overcurrent, short circuits, and overheating, thereby extending battery life.

[0028] The flexible circuit board 1212 is a bend-resistant circuit board made of polyimide or polyester film as the substrate, characterized by high wiring density, light weight, and thin thickness. The flexible circuit board 1212 is electrically connected to the printed circuit board 1211. Due to its bendable nature, the flexible circuit board 1212 is easy to connect to external circuits. For example, the flexible circuit board 1212 can be connected to the controller of the electrical device through a connector, so that the main board of the electronic device can uniformly control the battery assembly.

[0029] like Figure 1 and Figure 2 As shown, the battery cell 110 may include a positive tab 111 and a negative tab 112. The positive tab 111 and the negative tab 112 are electrically connected to the protection board body 121 respectively. The mechanical protection switch 122 can be installed close to the positive tab 111. Since the positive electrode is the source of current, placing the mechanical protection switch 122 at the positive tab 111 can cut off the circuit more quickly and effectively, preventing current from flowing to the protection board body 121, thereby further improving the safety performance of the battery pack.

[0030] like Figure 1As shown, in an optional embodiment of this application, the battery assembly may include at least two battery cells 110 arranged side by side. A protection plate body 121 extends from a predetermined end of each battery cell 110 and is electrically connected to the tabs of each battery cell 110. At least two mechanical protection switches 122 are provided, each corresponding to a battery cell 110, thereby enabling individual protection for each battery cell 110. For example, the battery assembly may include three battery cells 110 arranged side by side, and three mechanical protection switches 122 are also provided, each corresponding to a battery cell 110. By employing the above-described design of multiple battery cells 110 and multiple mechanical protection switches 122, the capacity of the battery assembly can be increased, and individual protection can be achieved for each battery cell 110, further enhancing the safety performance of the battery assembly.

[0031] The aforementioned mechanical protection switch 122 can be a temperature protection switch, defined as a first temperature lower than a second temperature. When the temperature protection switch is at the first temperature, it is in a closed state to allow the battery cell 110 to be in a normal charging and discharging state. When the temperature protection switch is at the second temperature, it can be in an open state to cut off the current between the battery cell 110 and the battery protection board 120. It should be noted that, according to relevant safety standards, a battery temperature exceeding 60°C may cause safety problems. Therefore, the first temperature range is no greater than 60°C, while the second temperature range can be greater than 60°C. In addition, the aforementioned mechanical protection switch 122 can also be an overcurrent protection switch. In the event of excessive current, the overcurrent protection switch can be in an open state to cut off the current between the battery cell 110 and the battery protection board 120.

[0032] like Figure 3As shown, the temperature protection switch may include a housing 1221, a first conductive element 1222, and a second conductive element 1223. The first conductive element 1222 and the second conductive element 1223 may be made of metal and have a certain degree of elasticity. The first conductive element 1222 has a first conductive part 1222a and a first connecting part 1222b. The housing 1221 is provided with an inner cavity. The first conductive part 1222a can extend into the inner cavity of the housing 1221 through a through hole on the side of the housing 1221. The first connecting part 1222b extends out of the housing 1221 and is used to electrically connect with the power supply contact 1211c of the protection plate body 121. The second conductive element 1223 has a second conductive part 1223a and a second connecting part 1223b. The second conductive part 1223a can extend into the inner cavity of the housing 1221 through the through hole on the side of the housing 1221. The first conductive part 1222a is connected to the second conductive part 1223a. The second connecting part 1223b extends out of the housing 1221 and is used to electrically connect with the power supply contact 1211c of the protection plate body 121. For the specific assembly method of the temperature protection switch and the printed circuit board 1211, for example, two power supply contacts 1211c can be respectively provided on both sides of the hollow area 1211b of the printed circuit board 1211. The first connecting part 1222b of the first conductive member 1222 can be connected to the two power supply contacts 1211c on one side of the hollow area 1211b by welding. Similarly, the second connecting part 1223b of the second conductive member 1223 can be connected to the two power supply contacts 1211c on the other side of the hollow area 1211b by welding, thereby realizing the structural fixation and electrical connection between the temperature protection switch and the printed circuit board 1211.

[0033] When the temperature protection switch is at a first temperature, the first conductive part 1222a and the second conductive part 1223a make conductive contact to keep the cell 110 in a normal charging and discharging state; when the temperature protection switch is at a second temperature, the first conductive part 1222a and the second conductive part 1223a separate to cut off the current between the cell 110 and the battery protection board 120.

[0034] like Figure 3 As shown, the temperature protection switch may further include a thermistor 1224, which may be made of a material that expands when heated, such as PTC, thermally expanding ceramic, or thermally expanding alloy. The thermistor 1224 is disposed between the first conductive part 1222a and the second conductive part 1223a, wherein the second conductive part 1223a may be located above the first conductive part 1222a, and the thermistor 1224 is configured to expand when the temperature rises.

[0035] From a circuit perspective, the mechanical protection switch 122 is connected in series between the protection board body 121 and the battery cell 110. The current output by the battery cell 110 is transmitted to the protection board body 121 through the electrode tabs. It first passes through the mechanical protection switch 122, and then sequentially through the first connecting part 1222b, the first conductive part 1222a, the second conductive part 1223a, and the second connecting part 1223b of the mechanical protection switch 122, and then is transmitted to other components of the protection board body 121. Therefore, the contact or separation of the first conductive part 1222a and the second conductive part 1223a can be controlled to control the current flow between the battery cell 110 and the protection board body 121. When the temperature protection switch is at the first temperature, the volume expansion rate of the thermistor 1224 is small, and the first conductive part 1222a and the second conductive part 1223a can maintain conductive contact, so that the battery cell 110 can continue to discharge. When the temperature protection switch is at the second temperature, the volume of the thermistor 1224 expands. The expanded thermistor 1224 will exert a force on the first conductive part 1222a and the second conductive part 1223a. Since the first conductive part 1222a can remain stationary under the support of the housing 1221, with the first conductive part 1222a as a reference, the thermistor 1224 will push the second conductive part 1223a to move upward, so that the first conductive part 1222a and the second conductive part 1223a are separated, so that the mechanical protection switch 122 is in the open state, thereby cutting off the current between the battery cell 110 and the protection board body 121.

[0036] like Figures 1 to 3 As shown in the illustration, this application also discloses a battery pack, which may include a battery pack housing and the aforementioned battery components. The battery pack housing has a mounting cavity, and the battery components can be encapsulated in the mounting cavity of the battery pack housing. To improve the energy density of the battery pack, two or more battery components can be assembled in the mounting cavity in series or parallel.

[0037] As described above, the battery pack disclosed in this application includes battery components that improve upon related technologies. The disclosed battery components include a cell 110 and a battery protection board 120. The battery protection board 120 includes a protection board body 121 and a mechanical protection switch 122. By integrating the mechanical protection switch 122 onto the protection board body 121 and then placing the protection board body 121 at a predetermined end of the cell 110 and electrically connecting it to the tab of the cell 110, the assembly of the battery protection board 120 and the cell 110 can be achieved. The protection board body 121 and the mechanical protection switch 122 can provide dual protection for the cell 100, thereby improving the safety performance of the battery. Since the mechanical protection switch 122 does not require additional steps to connect with the protection board body 121 and the tabs of the battery cell 110, it simplifies the battery assembly process and improves the battery production efficiency to a certain extent. Furthermore, the mechanical protection switch 122 does not require additional space at the preset end of the battery cell 110, thereby freeing up more space for the battery cell 110 and increasing the battery capacity.

[0038] This application also discloses an electronic device, which may include battery-powered electronic products such as mobile phones, tablets, televisions, smart wearable products (e.g., smartwatches, smart bracelets), virtual reality terminal devices, and augmented reality terminal devices. The aforementioned electronic device may also be a small rechargeable household appliance (e.g., a soymilk maker, a robot vacuum cleaner), a drone, or other electronic products. This application does not impose any special limitations on the specific form of the aforementioned electronic device. The aforementioned electronic device may include a device housing and the aforementioned battery assembly, with the battery assembly installed within the device housing.

[0039] As described above, the electronic device disclosed in this application includes a battery assembly that improves upon related technologies. The disclosed battery assembly includes a battery cell 110 and a battery protection board 120. The battery protection board 120 includes a protection board body 121 and a mechanical protection switch 122. By integrating the mechanical protection switch 122 onto the protection board body 121 and then placing the protection board body 121 at a predetermined end of the battery cell 110 and electrically connecting it to the tab of the battery cell 110, the battery protection board 120 and the battery cell 110 can be assembled. The protection board body 121 and the mechanical protection switch 122 can provide dual protection for the battery cell 100, thereby improving the safety performance of the battery. Since the mechanical protection switch 122 does not require additional steps to connect with the protection board body 121 and the tabs of the battery cell 110, it simplifies the battery assembly process and improves the battery production efficiency to a certain extent. Furthermore, the mechanical protection switch 122 does not require additional space at the preset end of the battery cell 110, thereby freeing up more space for the battery cell 110 and increasing the battery capacity.

[0040] The above embodiments of this application focus on describing the differences between the various embodiments. As long as the different technical features between the various embodiments are not contradictory, they can be combined to form more specific embodiments. For the sake of brevity, they will not be described in detail here.

[0041] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A battery assembly, comprising: It includes a battery cell (110) and a battery protection board (120); the battery protection board (120) includes a protection board body (121) and a mechanical protection switch (122). The protection board body (121) is located at a predetermined end of the battery cell (110) and is electrically connected to the tab of the battery cell (110). The mechanical protection switch (122) is integrated on the protection board body (121) and is electrically connected to the protection board body (121). The mechanical protection switch (122) has an open state and a closed state. When the mechanical protection switch (122) is in the open state, the current circuit between the battery cell (110) and the protection board body (121) is disconnected. When the mechanical protection switch (122) is in the closed state, the current circuit between the battery cell (110) and the protection board body (121) is connected.

2. The battery assembly of claim 1, wherein, The protection board body (121) has an extension (1211a) on the side near the battery cell (110). The extension (1211a) has a hollow area (1211b). Feeding contacts (1211c) are provided on both sides of the hollow area (1211b). The mechanical protection switch (122) is integrated on the extension (1211a). The mechanical protection switch (122) has a first conductive end and a second conductive end, and the first conductive end and the second conductive end are electrically connected to the power supply contacts (1211c) on both sides of the hollow area (1211b).

3. The battery assembly of claim 1, wherein, The main body (121) of the protection board includes a printed circuit board (1211) and a flexible circuit board (1212). The printed circuit board (1211) is electrically connected to the tab of the battery cell (110). The mechanical protection switch (122) is integrated on the printed circuit board (1211). The flexible circuit board (1212) is electrically connected to the printed circuit board (1211) and is used to connect to external circuits.

4. The battery assembly of claim 1, wherein, The battery cell (110) has a positive electrode (111) and a negative electrode (112), the positive electrode (111) and the negative electrode (112) are electrically connected to the protection board body (121) respectively, and the mechanical protection switch (122) is close to the positive electrode (111).

5. The battery assembly of claim 1, wherein, The battery assembly includes at least two cells (110), which are arranged side by side. The protection plate body (121) extends to a predetermined end of each cell (110) and is electrically connected to the tabs of the cells (110). The number of mechanical protection switches (122) is at least two, and the mechanical protection switches (122) are correspondingly arranged with the battery cell (110).

6. The battery assembly of claim 1, wherein, The mechanical protection switch (122) is a temperature protection switch. When the temperature protection switch is at a first temperature, the temperature protection switch is in a closed state. When the temperature protection switch is at a second temperature, the temperature protection switch is in an open state. The first temperature is lower than the second temperature.

7. The battery assembly of claim 6, wherein, The temperature protection switch includes a housing (1221), a first conductive element (1222), and a second conductive element (1223). The first conductive element (1222) has a first conductive portion (1222a) extending into the housing (1221) and a first connecting portion (1222b) extending out of the housing (1221). The second conductive element (1223) has a second conductive portion (1223a) extending into the housing (1221) and a second connecting portion (1223b) extending out of the housing (1221). The first conductive portion (1222a) is connected to the second conductive portion (1223a), and the first connecting portion (1222b) and the second connecting portion (1223b) are electrically connected to the protection plate body (121), respectively. When the temperature protection switch is at the first temperature, the first conductive part (1222a) and the second conductive part (1223a) are in conductive contact; when the temperature protection switch is at the second temperature, the first conductive part (1222a) and the second conductive part (1223a) are separated.

8. The battery assembly of claim 7, wherein, The temperature protection switch further includes a thermistor (1224), which is disposed between the first conductive part (1222a) and the second conductive part (1223a), and is configured to expand when the temperature rises; When the temperature protection switch is at the second temperature, the thermistor (1224) pushes the second conductive part (1223a) to move, so that the first conductive part (1222a) is separated from the second conductive part (1223a).

9. A battery pack, characterized by, It includes a battery pack housing and a battery assembly as described in any one of claims 1-8, wherein the battery assembly is installed in the battery pack housing.

10. An electronic device, comprising: It includes a device housing and a battery assembly as described in any one of claims 1-8, wherein the battery assembly is mounted in the device housing.

Images