BATTERY MODULE, BATTERY PACK, AND DEVICE

This application discloses a battery module, a battery pack, and a device, and relates to the field of battery technologies, to optimize a structure of the battery module. The battery module includes a battery, a wire harness board, a circuit board, and a temperature sensing assembly. The battery includes a top cover. The wire harness board is disposed on an outer side of the top of the top cover, and the wire harness board includes a body and a mounting portion disposed at the body. The circuit board is connected to the wire harness board. The temperature sensing assembly is mounted at the mounting portion, and pressed by the circuit board closely against the top cover. The battery module not only effectively implements temperature sensing at the top cover, but also prevents the temperature sensing assembly from being damaged due to excessive force applied by the circuit board.

TECHNICAL FIELD

Embodiments of this application relate to the field of battery technologies, and in particular, to a battery module, a battery pack, and a device.

BACKGROUND

The normal operating temperature of a battery module ranges between −30° C. and 55° C. If the limit temperatures are exceeded, the battery module limits discharge power to protect battery module safety.

In the related art, a temperature sensing method of the battery module is as follows: sensing a temperature of a connection piece through a thermistor disposed at a flexible circuit board, and using the temperature of the connection piece as a temperature inside a battery. In practice, the temperature of the connection piece is higher, while the temperature inside the battery is lower. If a difference between the two temperatures is large, the battery module limits power in advance, which may affect performance of the battery module.

Currently, vehicle manufacturers in the industry are all developing in a direction of coupe model, and traditional modified electric vehicles should reflect the advantage and characteristic of the electric vehicles: fast acceleration. Therefore, a demand for a rapid acceleration working condition will be increasingly common, so power requirements for battery modules will be increasingly high.

Due to limited internal space in the battery module, and considering manufacturing and cost factors, width and thickness of the connection piece cannot be large. In a low-power condition, for example, discharging at 1 C, the temperature of the connection piece is close to the temperature inside the battery. However, if a higher discharge rate is used, the temperature of the connection piece far exceeds the temperature inside the battery. In a high-power condition, due to limited current flow area of the connection piece, the temperature of the connection piece rises sharply, while the temperature inside the battery rises slowly, and a temperature difference between the two is huge. This causes the battery module to limit the power in advance, affecting the discharge power of the battery module. Hence, a temperature sensing assembly is required to sense the battery temperature in related technologies.

The inventor finds that there are at least the following problems in some cases: A conventional temperature sensing assembly receives a relatively large pressure during mounting, putting the temperature sensing assembly at a risk of being crushed, which causes the temperature sensing assembly to fail and unable to sense the temperature properly.

SUMMARY

This application proposes a battery module, a battery pack, and a device to optimize a structure of the battery module.

This application proposes a battery module, including:

a battery, including a top cover;

a wire harness board, disposed on an outer side of the top of the top cover, where the wire harness board includes a body and a mounting portion disposed at the body;

a circuit board, connected to the wire harness board; and

a temperature sensing assembly, mounted at the mounting portion, and pressed by the circuit board closely against the top cover.

Therefore, during sensing the temperature inside the battery, the temperature transfer path is short and a temperature response speed is fast. This also makes control more accurate for subsequent processing based on the sensed temperature, so that efficiency of the battery module can be effectively exerted, and a structure and performance of the battery module are effectively optimized.

In some embodiments, the temperature sensing assembly includes:

a thermistor, electrically connected to the circuit board; and

a thermal pad, where the thermistor is sandwiched between the mounting portion and the thermal pad, and the thermal pad abuts against the top cover. An error between a temperature sensed by the thermistor and the temperature inside the battery is relatively small, the temperature sensing is accurate, and a response is fast.

In some embodiments, the mounting portion includes:

an elastic part, where the elastic part is connected to the body, a gap is present between part of an edge of the elastic part and the body, and the thermistor abuts against the elastic part.

In some embodiments, the mounting portion further includes:

a coaming, disposed around the elastic part and forming a cavity with the elastic part, where the thermistor is located within the cavity and abuts against the elastic part, and the thermal pad is sandwiched between the thermistor and the top cover. The coaming defines a mounting region of the thermal pad, so that the thermal pad does not move freely after being mounted in place, which improves stability of the battery module structure and reliability of connections between the components, and also makes the head of the thermistor stay securely and reliably in position.

In some embodiments, an observation hole is provided in the circuit board, and the observation hole is located above the cavity. Whether the thermal pad is mounted in place is observed through the observation hole.

In some embodiments, the wire harness board further includes a connection portion connected to the body, a mounting hole is correspondingly provided in the circuit board, and the connection portion snaps into the mounting hole.

In some embodiments, a gap is present between part of an edge of the connection portion and the body.

In some embodiments, a first positioning portion is provided at an edge of the circuit board, a second positioning portion is provided at the wire harness board, a gap is present between the second positioning portion and a surface of the wire harness board used for the circuit board to abut on, and at least part of the first positioning portion is accommodated in the gap. The first positioning portion and the second positioning portion are matched, so that the circuit board is securely mounted.

In some embodiments, the thermistor is connected to a connector plug, a connector socket is provided at the circuit board, and the connector plug is plugged into the connector socket, so that the thermistor is electrically connected to the circuit board.

An embodiment of this application further provides a battery pack, including the battery module according to any one of the technical solutions of this application.

An embodiment of this application further provides a device, including the battery pack according to any one of the technical solutions of this application, where the battery pack is configured to provide electrical energy.

In the battery module provided in the foregoing technical solution, the temperature sensing assembly is mounted in the mounting portion of the wire harness board, and the temperature sensing assembly directly abuts against the top cover of the battery. A temperature of the top cover is basically the same as the temperature inside the battery, and the top cover is capable of reflecting a change and level of the temperature inside the battery in a timely manner. If the temperature inside the battery rises, the temperature of the top cover rises in a timely manner; and if the temperature inside the battery drops, the temperature of the top cover drops in a timely manner. The temperature of the top cover varies with the temperature inside the battery in a timely manner.

In the battery module provided in the foregoing technical solution, a temperature transfer path of the battery module is as follows: The temperature inside the battery is transferred to the top cover, and the temperature of the top cover is directly transferred to the temperature sensing assembly. The temperature sensing assembly transfers the sensed temperature to components such as the circuit board for subsequent analysis, processing, and judgment. It can be learned from the foregoing temperature transfer path that in the battery module provided in the foregoing technical solution, during sensing the temperature inside the battery, the temperature transfer path is short and a temperature response speed is fast. This also makes control more accurate for subsequent processing based on the sensed temperature. Therefore, this can effectively reduce or even prevent occurrence of power limitation performed by the battery module in advance. In this way, efficiency of the battery module can be effectively exerted, a structure and performance of the battery module are effectively optimized, performance of a device (for example, a vehicle) using the battery module is also optimized, and reliability of the device is increased.

DESCRIPTION OF EMBODIMENTS

The technical solutions provided in this application will be described in more detail below with reference toFIG. 1toFIG. 18.

Referring toFIG. 1toFIG. 3, an embodiment of this application provides a battery module, including a battery1, a wire harness board2, a circuit board3, and a temperature sensing assembly4. The battery1includes a top cover12. The wire harness board2is disposed on an outer side of the top of the top cover12. The wire harness board2includes a body20and a mounting portion21disposed at the body20. The circuit board3is connected, and specifically, for example, buckled, to the wire harness board2. The temperature sensing assembly4is mounted at the mounting portion21, and pressed by the circuit board3closely against the top cover12.

In the battery module using the foregoing structure, a temperature sensing path is as follows: A temperature inside the battery1is transferred to the top cover12, and a temperature of the top cover12is directly transferred to the temperature sensing assembly4, then transferred by the temperature sensing assembly4to the circuit board3electrically connected to a thermistor41of the temperature sensing assembly4, so that a temperature signal sensed by the thermistor41is transferred to the circuit board3. So far, sensing of the temperature inside the battery1is completed. The temperature sensing assembly4transfers the sensed temperature to components such as the circuit board3for subsequent analysis, processing, and judgment.

It can be learned from the foregoing temperature transfer path that in the battery module provided in the foregoing technical solution, during sensing the temperature inside the battery1, the temperature transfer path is short and a temperature response speed is fast. This also makes control more accurate for subsequent processing based on the sensed temperature. Therefore, this can effectively reduce or even prevent occurrence of power limitation performed by the battery module in advance. In this way, efficiency of the battery module can be effectively exerted, a structure and performance of the battery module are effectively optimized, performance of vehicle equipment using the battery module is also optimized, and reliability of the vehicle equipment is increased.

In some embodiments, in the foregoing technical solution, the circuit board3and the wire harness board2are specifically connected by using a buckle, the circuit board3is used to press the temperature sensing assembly4closely against the top cover12, and no additional mounting structure is disposed at the temperature sensing assembly4. The matching force of the circuit board3and the wire harness board2in the buckle connection is small, so a pressing force applied by the circuit board3against the temperature sensing assembly4is also small. This structure not only effectively implements temperature sensing from the top cover, but also prevents the temperature sensing assembly4from being damaged due to excessive force applied on the temperature sensing assembly4, effectively ensuring reliability of sensing a temperature by the temperature sensing assembly4, and also increasing operating reliability of the battery module.

The circuit board3for example is a PCB (Printed Circuit Board) board.

The following describes in detail a structure of each component and connection relationships between components in some embodiments.

A specific structure of the battery1is first described. Based on different manufacturing methods of electrode assemblies, the battery1is a laminated battery or a wound battery. The laminated battery is formed by cutting a positive electrode plate, a negative electrode plate, and a separator into a specified size and stacking the positive electrode plate, the separator, and the negative electrode plate. The wound battery is formed by winding a positive electrode plate, a negative electrode plate, and a separator.

Referring toFIG. 3, a structure of the battery1in some embodiments is as follows: The battery1includes a housing10, an electrode assembly (not shown in the figure) disposed inside the housing10, the top cover12disposed at the top of the electrode assembly, an electrode terminal11disposed at the top cover12, and a top patch13disposed at the top of the top cover12. Specifically, the top patch13is pasted to the top of the top cover12. The top patch13is provided with an explosion-proof hole14, and an explosion-proof valve15is mounted in the explosion-proof hole14. The top patch13is further provided with two electrode terminal through-holes131, and one electrode terminal11is mounted in each electrode terminal through-hole131. The electrode terminal11includes a positive electrode terminal111and a negative electrode terminal112.

A material of the top patch13is, for example, an insulating material. The top patch13is sheet-shaped, and its size matches a size of a top surface of the top cover12. For example, the structure and the size of the top patch13are just big enough for the top patch13to completely cover the top surface of the top cover12; or the size of the top patch13is slightly larger than the size of the top surface of the top cover12, so that the top patch13is big enough to form a bent edge to cover the top cover12.

The top patch13plays an insulating role to prevent the top cover12from being short-circuited with an external circuit. The top patch13also plays a protection role to prevent the top cover12from being scratched.

Referring toFIG. 3, specifically, an opening K is provided at a position of the top patch13close to the negative electrode terminal112, the top cover12is located on an outer side of the bottom of the top patch13, and the opening K exposes a partial region of the top cover12. A thermal pad42of the temperature sensing assembly4described later is mounted in the opening K. Specifically, for example, the thermal pad42is pasted to a side wall of the opening K by using an adhesive; or the thermal pad42is directly pasted and fastened to the top cover12; or the thermal pad42directly abuts against a position of the top cover12corresponding to the opening K, with no adhesive used. In some embodiments shown later, a specific mounting method of the thermal pad42is described. The thermal pad42, after being mounted in place, is in close contact with the top cover12. Because the thermal pad42is made of a thermal material, the thermal pad42is capable of transferring the temperature of the top cover12to a thermistor41, and the temperature is then transferred via the thermistor41to the circuit board3described later, thereby implementing sensing the temperature of the top cover12.

The foregoing temperature sensing assembly4may be disposed at any position around the negative electrode terminal112, but considering mounting of other components, mounting space of the temperature sensing assembly4itself, and ease of mounting, in some embodiments, the temperature sensing assembly4is disposed on either side of the negative electrode terminal112in the width direction of the battery1, as the position of the opening K shown inFIG. 3. The width direction of the battery1is a direction, in a plane where the top surface of the top patch13is located, perpendicular to the line connecting to the centers of the positive electrode terminal111and the negative electrode terminal112.

A temperature of the top cover12near the negative electrode terminal112is closer to a real temperature inside the battery1, and a temperature difference between the two temperatures under severe working conditions is within an acceptable 5° C. The temperature sensing assembly4is disposed close to the negative electrode terminal112of the battery1. With the foregoing structure, a temperature transfer path is as follows: The temperature inside the battery1is transferred to the top cover12; and the foregoing thermal pad42is disposed at the top cover12near the negative electrode terminal112, so the temperature of the top cover12near the negative electrode terminal112is transferred to the thermal pad42, then to the thermistor41of the temperature sensing assembly4. Because the top cover12is in direct contact with the temperature sensing assembly4, the temperature sensed by the thermistor41can more accurately reflect the temperature inside the battery1. In the foregoing technical solution, even when the battery module operates in severe working conditions, an error between a temperature sensed by the thermistor41and a temperature inside the battery1is relatively small, so that the sensed temperature is accurate, and a response is fast.

Referring toFIG. 4toFIG. 17, the following describes a structure of the wire harness board2.

The structure of the wire harness board2is described from two aspects: a structure of the wire harness board2for fixedly mounting the temperature sensing assembly4, and a structure of the wire harness board2for mounting the circuit board3.

Referring toFIG. 12andFIG. 17, the structure of the wire harness board2for fixedly mounting the temperature sensing assembly4is first described.

The mounting portion21includes an elastic part22, where the elastic part22is connected to the body20, and a gap is present between part of an edge of the elastic part22and the body20. The thermistor41abuts against the elastic part22.

In some embodiments, the mounting portion21of the wire harness board2further includes a coaming23. The coaming23is disposed around the elastic part22and forms a cavity24with the elastic part22. The thermistor41is located within the cavity24and abuts against the elastic part22. The thermal pad42is sandwiched between the thermistor41and the top cover12. The cavity24is located on a side of the wire harness board2facing toward the top cover12, as shown inFIG. 15toFIG. 17.

A cross-sectional shape of the cavity24is, for example, rectangular or circular. The cavity24has a specified depth, and the cavity24is used to place the thermal pad42of the temperature sensing assembly4. A size of an opening of the cavity24is larger than a size (or the diameter) of the thermistor41, and a size of the thermal pad42matches the size of the opening of the cavity24, so the size of the thermal pad42is relatively large, and the thermal pad42and the thermistor41can be in complete contact. A side wall of the cavity24also plays a role of limiting the thermal pad42, thereby restricting displacement of the thermal pad42in a plane of the circuit board3, preventing the thermal pad42from displacing under severe working conditions, and preventing the thermistor41from failing to accurately sense a temperature.

A through-hole is provided in the body20, and the elastic part22is mounted in the through-hole. One end of the elastic part22is fixedly connected to or integrated with the body20. The other end of the elastic part22is a free end. To be specific, a gap is present between the free end of the elastic part22and the body20, and the free end of the elastic part22can swing in an up and down direction. The so-called up and down direction is a direction from the circuit board3to the battery1. Referring toFIG. 14andFIG. 20, a surface of the free end of the elastic part22is partially located on an outer side of a surface of the body20. The free end of the elastic part22is, for example, provided with an inner groove, a shape of the inner groove matches a shape of a head of the thermistor41described later, and the head of the thermistor41is mounted in the inner groove.

Still referring toFIG. 17, the coaming23defines a mounting region of the thermal pad42, so that the thermal pad42cannot move freely after being mounted in place, which improves stability of the battery module structure and reliability of connection relationships between the components, and also makes the head of the thermistor41stay securely and reliably in position. In a temperature sensing operation, a temperature can be sensed along the following temperature sensing path: from the top cover12of the battery1to the thermal pad42, then from the thermal pad42to the head of the thermistor41, and then from the head of the thermistor41to a temperature sensing circuit. The whole temperature sensing path is very short, and the temperature sensing is reliable.

The structure of one side of the elastic part22facing toward the circuit board3is as shown inFIG. 12toFIG. 14. When the elastic part22is not mounted, a surface of one side of the elastic part22facing toward the circuit board3is slightly higher than the surface of the body20, as shown inFIG. 14. This structure subsequently enables the circuit board3to be pressed by the elastic part22to press the temperature sensing assembly4closely against the top cover12.

In the foregoing technical solution, the head of the temperature sensing assembly4stays securely and reliably in position, and the pressing force applied on the head of the temperature sensing assembly4is relatively small, so that the temperature sensing assembly4is not prone to damage or failure. With the foregoing structure, the temperature sensing path is as follows: The temperature of the top cover12is directly transferred to the thermal pad42, then to the thermistor41, and then sensed by the circuit board3. It is obvious that in the foregoing technical solution, the temperature sensing path is short, a temperature sensed by the thermistor41is comparatively the same as a temperature inside the battery1, and the sensed temperature value is accurate. Further, the temperature sensing assembly4performs properly, improving operating reliability of the battery module.

Referring toFIG. 9toFIG. 15andFIG. 18, the following describes a structure of the wire harness board2for connecting the circuit board3. The wire harness board2further includes a connection portion25connected to the body20, and a mounting hole31is correspondingly provided in the circuit board3. The connection portion25snaps into the mounting hole31.

In some embodiments, a gap is present between part of an edge of the connection portion25and the body20.

When the circuit board3is not at the mounting position, the connection portion25and the mounting hole31are not aligned. When the circuit board3is at the mounting position, the positions of the connection portion25and the mounting hole31are just aligned, and the connection portion25snaps into the mounting hole31.

A gap is present between part of an edge of the connection portion25and the body20, so that the connection portion25can swing up and down relative to the body20. One end of the connection portion25is fixedly connected to or integrated with the body20, the other end of the connection portion25is a free end, and a gap is present between the free end of the connection portion25and the body20. In a process of mounting the circuit board3, the free end of the connection portion25is deformed under the pressure of the circuit board3. When the circuit board3is mounted in place, the positions of the connection portion25and the mounting hole31are just aligned, and the connection portion25snaps into the mounting hole31under the action of its own elastic force. The shape of the free end of the connection portion25is, for example, a block or another shape that can be snapped into the mounting hole31.

In some embodiments, at least two connection portions25are dispersedly disposed at the wire harness board2, and at least two mounting holes31are correspondingly provided in the circuit board3. The connection portions25and the mounting holes31are in a one-to-one correspondence.

In the cases shown inFIG. 15andFIG. 18, three connection portions25are dispersedly disposed at the wire harness board2, and three mounting holes31are correspondingly provided in the circuit board3. This is merely a case. In practical applications, a quantity and positions of connection portions25may be set based on an actual need, to meet the requirement for snapping the wire harness board2into the circuit board3.

In the foregoing technical solution, the wire harness board2is connected to the circuit board3by a design using many sets of matched connection portions25and mounting holes31. Moreover, this connection is strong enough and no excessive pressure is applied by the circuit board3on the elastic part22of the wire harness board2, so that the thermistor41is not under excessive pressure, which effectively reduces cases that the thermistor41is damaged and fails due to excessive pressure, and increases reliability of the temperature sensing assembly4to sense the temperature.

Referring toFIG. 4toFIG. 8, the following describes how to mount the circuit board3onto the wire harness board2. A first positioning portion33is provided at an edge of the circuit board3, and the first positioning portion33is specifically a convex portion. A second positioning portion26is correspondingly provided at the wire harness board2. For example, the second positioning portion26is specifically a boss. A gap M is present between the second positioning portion26and a surface of the wire harness board2abutting on the circuit board3. The first positioning portion33is at least partially accommodated in the gap M.

The first positioning portion33and the second positioning portion26are constructed to match together in mounting, so that the circuit board3can be mounted into the foregoing gap. After mounting, the first positioning portion33and the second positioning portion26are matched, so that the circuit board3is securely mounted.

The second positioning portion26is located at the top of the wire harness board2, and a gap M is present between the second positioning portion26and the surface of the wire harness board2abutting on the circuit board3. As shown inFIG. 7andFIG. 8, the gap M is used to accommodate the edge portion of the circuit board3, to restrict displacement of the circuit board3in the height direction of the battery module.

During mounting, the first positioning portion33and the second positioning portion26should not be aligned first, and then the circuit board3is pressed down in the direction where the wire harness board2is located, so that the circuit board3abuts against the wire harness board2. Then, the circuit board3is pushed along the length direction of the circuit board3so that the mounting hole31of the circuit board3is aligned with the connection portion25of the wire harness board2. After the connection portion25snaps into the mounting hole31, the mounting of the circuit board3and the wire harness board2is completed. In this case, the first positioning portion33and the second positioning portion26are matched, that is, the first positioning portion33is at least partially accommodated in the gap M, and the second positioning portion26plays a role of limiting and blocking the circuit board3, preventing the circuit board3from being detached from the wire harness board2. In the foregoing technical solution, the first positioning portion33and the second positioning portion26which are matched are used to limit the circuit board3. In this way, the structure is compact and reliable.

The following describes a structure of the temperature sensing assembly4.

Referring toFIG. 17, the temperature sensing assembly4includes the thermistor41and the thermal pad42. The thermistor41is sandwiched between the mounting portion21and the thermal pad42, and the thermal pad42abuts against the top cover12.

The thermal pad42of the temperature sensing assembly4and an end of the thermistor41are disposed close to the negative electrode terminal112of the battery1. The thermal pad42is in direct contact with the top cover12, so the temperature of the top cover12can be accurately transferred to the thermistor41of the temperature sensing assembly4. The size, thickness, material, and shape of the thermal pad42should meet the mounting requirements, and the mounting portion21, the thermistor41, and the thermal pad42need to be in close contact. With close contact of the foregoing three components, heat transfer is more reliable. Air heat transfer due to a gap caused by non-contact between the components should be avoided to the greatest extent possible, and the inaccurate temperature sensing caused by the air heat transfer should also be avoided. In this way, the temperature sensed by the thermistor41is more accurate, and can more truly reflect the temperature of the top cover12, and accurately reflect the temperature inside the battery1.

The thermistor41of the temperature sensing assembly4may be a patch type NTC (Negative Temperature Coefficient, negative temperature coefficient) temperature sensor, or a water drop type NTC temperature sensor.

In some embodiments, the thermistor41is the water drop type NTC temperature sensor. The water drop type NTC temperature sensor includes a head and a wire connected to the head. The head is in the shape of a water drop, so it can also be called a water drop head or end. The water drop is sandwiched between the elastic part22of the mounting portion21and the thermal pad42. One end of the wire close to the head is fixed by a buckle structure, for example, to ensure a reliable connection of the wire.

The temperature inside the battery1is directly transferred to the top cover12, the temperature of the top cover12is directly transferred to the thermal pad42, and the thermal pad42transfers the temperature directly to the water drop head. The water drop head senses the temperature, and then transfers the sensed temperature through the wire to the subsequent circuit board3. The electrical connection between the thermistor41and the circuit board3will be described in detail later.

The thermistor41is electrically connected to the circuit board3, so that the temperature sensed by the thermistor41is transferred to the circuit board3for subsequent analysis and processing, and then operating state control of the battery module.

Specifically, referring toFIG. 11, the thermistor41is connected to a connector plug6, a connector socket7is provided at the circuit board3, and the connector plug6is plugged into the connector socket7, so that the thermistor41is electrically connected to the circuit board3.

Specifically, the end of the wire of the thermistor41leaving the head is electrically connected to the connector plug6. Existing products may be used as the connector plug6and the connector socket7. Based on the foregoing connection manner, the electrical connection between the thermistor41and the circuit board3is conveniently implemented. In addition, the electrical connection is reliable, and the mounting is simple and efficient.

Referring toFIG. 18, to observe whether the thermal pad42is mounted in place, an observation hole32is also provided in the circuit board3, and the observation hole32is located above the cavity24. The size set for the observation hole32should satisfy an observation requirement. Through the observation hole32, it can be observed whether the position of the thermal pad42is accurate. In the technical solution provided in the foregoing embodiment, the thermistor41is firmly mounted in the mounting portion21through the elastic part22and the coaming23, and the observation hole32can be used to observe whether the thermal pad42is mounted in place. When the battery module is operating under severe working conditions, the head and the wire of the thermistor41are not easily shifted or loosened, so the accuracy and reliability of the temperature sensing are improved.

Referring toFIG. 13toFIG. 15, the following describes a mounting process of the temperature sensing assembly4.

After the battery module is assembled to a semi-finished product, the thermistor41and the thermal pad42are mounted into the mounting portion21. Then the circuit board3is mounted onto the wire harness board2, and the connector plug6connected to the thermistor41is plugged into the connector socket7on the circuit board3, so that the thermistor41is electrically connected to the circuit board3, and a temperature signal of the top cover12sensed by the thermistor41can be transferred to the circuit board3.

In the battery module provided in the foregoing technical solution, the temperature of the top cover12is transferred to the thermistor41of the temperature sensing assembly4through a short transfer path. In this way, a temperature transfer response is fast, a temperature loss is low, and a measurement result is accurate. Moreover, the temperature at a part of the top cover12close to the negative electrode terminal112is basically the same as the temperature inside the battery1, and the temperature sensed by the thermistor41basically accurately reflects the temperature inside the battery1. In some embodiments, the temperature transfer path is short, and a temperature change inside the battery1can also be reflected as a temperature change of the top cover12in a timely manner, so that the temperature sensed by the thermistor41also changes in a timely manner. This provides accurate temperature data for processing by the circuit board3, makes control more accurate, and effectively reduces or even prevents occurrence of discharge power limitation performed by the battery module in advance.

An embodiment of this application further provides a battery pack, including the battery module according to any one of the technical solutions of this application.

Having the battery module provided in any one of the technical solutions of this application, the battery pack provided in the foregoing technical solution also has the various structures and the beneficial effects of the battery module mentioned above.

An embodiment of this application further provides a device, including the battery pack according to any one of the technical solutions of this application, and the battery pack is configured to provide electrical energy.

For example, the device is specifically transportation equipment, or an energy storage cabinet. The transportation equipment is, for example, an electric vehicle, or a ship.

Having the battery pack provided in any one of the technical solutions of this application, the device provided in the foregoing technical solution also has the various structures and the beneficial effects of the battery pack mentioned above.

In the descriptions of this application, it should be understood that the orientations or positional relationships indicated by the terms “center”, “vertical”, “transverse”, “front”, “rear”, “left”, “right”, “perpendicular”, “horizontal”, “top”, “bottom”, “inside”, “outside”, and the like are based on the orientations or positional relationships shown in the accompanying drawings, are merely intended to facilitate the descriptions of this application and simplify the descriptions, are not intended to indicate or imply that the mentioned apparatuses or components must have specific orientations, or be constructed and operated for a specific orientation, and therefore shall not be construed as a limitation to the content protected by this application.