Battery pack and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack and a battery pack. The out-of-control detection assembly comprises a detection power supply, a signal acquisition module and a plurality of printing resistors, the detection power supply, the signal acquisition module and the plurality of printing resistors are sequentially connected and form a detection loop, and the plurality of printing resistors are sequentially arranged along a preset direction. The temperature of the printing resistor tends to be consistent with the current temperature of the battery, the printing resistor has the characteristic of failure at the preset temperature, and the plurality of printing resistors are connected in series, so that when the temperature of any battery in the plurality of batteries reaches the preset temperature, the printing resistor corresponding to the battery fails; when the signal acquisition module detects that the detection loop is in an open-circuit state, an operator can be reminded that the temperature of the battery in the battery pack exceeds the preset temperature.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to battery pack and battery package. BACKGROUND

[0002] Secondary battery is widely used in electric vehicles and energy storage power stations and other fields due to its high energy density, excellent cycle performance and no memory effect. However, due to its high energy density and flammable and explosive composition, it is prone to thermal runaway combustion under thermal, electrical or mechanical abuse conditions. Therefore, in order to improve the safety of secondary battery during use, the temperature of secondary battery needs to be collected and monitored.

[0003] At present, the temperature collection method of secondary battery mainly adopts NTC (Negative Temperature Coefficient) thermistor scheme with negative temperature coefficient. According to the battery package thermal simulation, NTC temperature sampling components are arranged in the part with large temperature difference. However, this scheme can only monitor the local position prone to thermal runaway in the battery package, and cannot monitor the temperature change state of each battery in the battery package. When the temperature of the cell without NTC changes, it is impossible to quickly and accurately determine the temperature state of the cell. When the cell is in thermal runaway and the heat spreads to the cell with NTC, it will be reported, which exists safety hazard. SUMMARY

[0004] Therefore, the utility model provides a kind of battery pack and battery package to solve the safety hazard problem of the temperature collection method of existing secondary battery.

[0005] In the first aspect, the utility model provides a kind of battery pack, comprising: multiple batteries, sequentially arranged along the preset direction;Runaway detection component, including detection power supply, signal acquisition module and multiple printed resistors, multiple printed resistors are sequentially arranged along the preset direction, the outer wall of each battery is correspondingly arranged with at least one printed resistor, detection power supply, signal acquisition module and multiple printed resistors are sequentially connected and form detection loop, signal acquisition module is used to detect the on-off state of detection loop, detection loop has the pass state of printed resistor continuous work when battery does not reach preset temperature, detection loop also has the open circuit state of printed resistor failure when battery reaches preset temperature.

[0006] Beneficial effects: The components in the out-of-control detection assembly are sequentially connected in series to form a detection loop. Since each battery is arranged corresponding to the corresponding printed resistor, the heat of the battery can be quickly transferred to the printed resistor, and the temperature of the printed resistor will tend to be consistent with the current temperature of the battery. Since the printed resistor has a failure characteristic at a preset temperature, and multiple printed resistors are connected in series, when the temperature of any battery in the multiple batteries reaches the preset temperature, the corresponding printed resistor will fail. The signal acquisition module detects that the detection loop is in an open circuit state. At this time, the fault can be uploaded to the corresponding ECU (such as BMS or VCU) in time. That is, if the temperature of the battery in the battery pack exceeds the preset temperature, the ECU can immediately determine the situation, increase the escape time before the battery overheats, and effectively solve the safety hazard problem of the existing secondary battery temperature acquisition method.

[0007] In an optional embodiment, a flexible circuit board is arranged above the battery along a preset direction, and the printed resistor is arranged on the flexible circuit board and corresponds to the top of the battery.

[0008] Beneficial effects: The flexible circuit board can simultaneously carry multiple printed resistors. Adjacent printed resistors in the detection loop can be connected through etched circuits in the flexible circuit board. The connection method and arrangement method are simple and reliable.

[0009] In an optional embodiment, a heat-conducting member is arranged in the through hole, and the heat-conducting member is located between the printed resistor and the top of the battery.

[0010] Beneficial effects: The isolation plate can improve the insulation reliability between the flexible circuit board and the battery. The heat of the top of the battery can be directly transferred to the printed resistor through the through hole, which can reduce the hindering effect of the isolation plate on the heat conduction of the battery. The overall structure is simple and reliable, and is easy to process and manufacture.

[0011] In an optional embodiment, the printed resistor is arranged on the top cover or explosion-proof valve of the battery.

[0012] Beneficial effects: This form of printed resistor does not need to be separately arranged on the surface of the battery, and can be directly arranged on the surface of the battery in contact with the battery. The structure is small and occupies less space.

[0013] In an optional embodiment, the printed resistor includes a main body, a metal substrate, an insulating film, and a connector. The main body is arranged on the surface of the metal substrate. The insulating film wraps the main body and the metal substrate. The connector is connected to the metal substrate through the insulating film. This form of printed resistor has a simple and effective structure, and is easy to process and manufacture.

[0014] In an alternative embodiment, the signal acquisition module comprises a pull resistor and a voltage sampling circuit, the power supply, the pull resistor and the plurality of printed resistors are connected in sequence, and the voltage sampling circuit is connected in parallel to both sides of the pull resistor.

[0015] Beneficial effects: the signal acquisition module has simple and reliable arrangement form.

[0016] In an alternative embodiment, the preset temperature ranges from 60 DEG C to 70 DEG C.

[0017] Beneficial effects: the preset temperature can remind the operator in a safer state, and the safety is higher.

[0018] In an alternative embodiment, a thermistor disposed on the flexible circuit board is further included, the thermistor is in contact with the battery and connected to the battery management system of the battery pack through the flexible circuit board, and the thermistor is used for detecting the temperature of the battery.

[0019] Beneficial effects: in this way, the temperature of the local position of the battery can be continuously collected, so as to monitor the working state of the battery and consider whether the heat management strategy is involved.

[0020] In a second aspect, the utility model also provides a battery pack, it includes: box body, has installation space;At least one above-mentioned battery group, set up in installation space;Battery management system, set up in the box body and with the signal acquisition module of battery group's out of control detection component connects. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in prior art, the following will briefly introduce the drawing needed to be used in the specific embodiment or prior art description, and obviously, the drawing in the following description is some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0022] Figure 1 It is the top view of the battery group of the utility model embodiment;

[0023] Figure 2 It is the top view of the battery group; Figure 1 The flexible circuit board of the battery group is not shown in the top view;

[0024] Figure 3 It is the top view of the flexible circuit board of the battery group; Figure 1 The flexible circuit board of the battery group is not shown in the top view;

[0025] Figure 4 It is the enlarged schematic view of A of the battery group; Figure 3 The flexible circuit board of the battery group is not shown in the top view;

[0026] Figure 5 for Figure 1 The diagram shows a cross-section of the printed resistors of the battery pack when they are fitted with the battery.

[0027] Figure 6 for Figure 1 The diagram shows the connection of the detection loop formed by the runaway detection component in the battery pack.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Battery; 2. Runaway detection component; 201. Detection power supply; 202. Printed resistor; 2021. Main body; 2022. Connecting wire; 203. Pull-out resistor; 204. Voltage sampling circuit; 3. Flexible circuit board; 4. Isolation plate; 401. Through hole; 5. Thermal conductive component; 6. Thermistor; 7. Sampling component. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] The following is combined with Figures 1 to 6 The following describes embodiments of the present invention.

[0032] According to an embodiment of the present invention, a battery pack is provided, comprising: a plurality of batteries 1 and a runaway detection component 2. The plurality of batteries 1 are arranged sequentially along a preset direction. The runaway detection component 2 includes a detection power supply 201, a signal acquisition module, and a plurality of printed resistors 202. The plurality of printed resistors 202 are arranged sequentially along the preset direction. The outer wall of each battery 1 is correspondingly provided with at least one printed resistor 202. The detection power supply 201, the signal acquisition module, and the plurality of printed resistors 202 are sequentially connected to form a detection circuit. The signal acquisition module is used to detect the on / off state of the detection circuit. The detection circuit has a closed circuit state in which the printed resistors 202 continue to work when the battery 1 has not reached a preset temperature, and an open circuit state in which the printed resistors 202 fail when the battery 1 reaches the preset temperature.

[0033] It is understandable that the preset direction is Figure 1 The left and right directions in the middle.

[0034] The components in the out-of-control detection assembly 2 are connected in series to form a detection loop. Since each battery 1 is provided with a corresponding printed resistor 202, the heat of the battery 1 can be quickly transferred to the printed resistor 202, and the temperature of the printed resistor 202 will tend to be consistent with the current temperature of the battery 1. Since the printed resistor 202 has a failure characteristic at a preset temperature, and a plurality of printed resistors 202 are connected in series, when the temperature of any battery 1 in the plurality of batteries 1 reaches the preset temperature, the corresponding printed resistor 202 will fail. The signal acquisition module detects that the detection loop is in an open circuit state, and at this time, the ECU (BMS or VCU, etc.) can be reminded that the temperature of the battery 1 in the battery pack exceeds the preset temperature. The ECU (BMS or VCU, etc.) can immediately respond to this situation to avoid the situation where the battery 1 is severely out of control and the operator is reminded. The safety problem of the existing secondary battery temperature acquisition method is effectively solved.

[0035] Compared with the method of setting a chip assembly on each battery 1 and detecting the temperature of each battery 1 by a corresponding temperature sensor in the chip assembly, the temperature sensor has a more complex structure and occupies more space. In order to accurately detect the temperature of each battery 1, each temperature sensor needs to form a detection loop separately, which will significantly increase the manufacturing and arrangement difficulty and cost of the out-of-control detection method.

[0036] The printed resistor 202 of the present embodiment is formed by mixing a high-molecular polymer organic binder and carbon powder or graphite into a slurry according to a preset ratio, and coating the resistance on a foil (metal substrate) according to a certain weight. The structure of the printed resistor 202 is small and occupies less space. The shape of the printed resistor 202 can be adjusted according to the set position. In addition, the out-of-control detection assembly 2 only needs one detection loop to monitor the temperature of a plurality of batteries 1 at the same time. Once the detection loop changes from a pass-through state to an open circuit state, it means that the temperature of the battery 1 in the battery pack exceeds the preset temperature. The out-of-control detection assembly 2 is sensitive and the arrangement and connection method is simple and reliable.

[0037] It should be noted that the printed resistor can be adjusted by adjusting the preset ratio of the high-molecular polymer organic binder and the carbon powder or graphite in the slurry to fail at different preset temperatures. The specific preset ratio and the corresponding relationship between the preset temperatures can be achieved by using the related schemes in the prior art, which will not be described in detail in the present application.

[0038] The number of printed resistors 202 corresponding to one battery 1 is not limited, and can be one or a plurality of printed resistors 202 in contact with different positions of the battery 1, which can be flexibly selected.

[0039] In one possible implementation, as shown in FIG. 2, the printed resistor 202 is provided on the surface of the battery 1. Figure 3As shown, the battery pack further comprises a flexible circuit board 3 arranged above the battery 1 along the preset direction, the printed resistor 202 is arranged on the flexible circuit board 3 and corresponds to the top of the battery 1, the flexible circuit board 3 can simultaneously bear a plurality of printed resistors 202 as a bearing structure, and adjacent printed resistors 202 in the detection circuit can be connected through etching circuits in the flexible circuit board 3, and the connection mode and arrangement mode are simple and reliable.

[0040] It can be understood that, as an alternative embodiment, the printed resistor 202 can also be arranged on the battery 1 instead of the flexible circuit board 3.

[0041] Specifically, as shown in Figure 4 The printed resistor 202 comprises a main body 2021 and a connecting wire 2022 arranged inside the main body 2021. The main body 2021 is a slurry mixed by a high-molecular polymer organic binder and carbon powder or graphite according to a preset ratio.

[0042] In a possible embodiment, as shown in Figure 1 and Figure 2 The battery pack further comprises an isolation plate 4 arranged between the flexible circuit board 3 and the battery 1, the isolation plate 4 is provided with a through hole 401 corresponding to the position of the printed resistor 202, the isolation plate 4 can improve the insulation reliability between the flexible circuit board 3 and the battery 1, the heat on the top of the battery 1 can be directly transmitted to the printed resistor 202 through the through hole 401, and the hindering effect of the isolation plate 4 on the heat conduction of the battery 1 can be reduced, and the overall structure is simple and reliable and convenient for processing and manufacturing.

[0043] The specification size of the isolation plate 4 and the number and size of the through hole 401 are not limited, that is, they can be flexibly selected according to requirements, the specification size of the isolation plate 4 can match the specification size of the flexible circuit board 3, and the number and size of the through hole 401 can be arranged according to the shape and number of the printed resistor 202.

[0044] In a possible embodiment, the battery pack further comprises a heat-conducting member 5 arranged in the through hole 401, the heat-conducting member 5 is located between the printed resistor 202 and the top of the battery 1, the heat-conducting member 5 has high heat-conducting efficiency and can effectively fill the space between the printed resistor 202 and the battery 1, so as to ensure that the heat of the battery 1 can be quickly and efficiently transmitted to the printed resistor 202.

[0045] It can be understood that, as an alternative embodiment, the heat-conducting member 5 can also not be arranged, and the printed resistor 202 can be directly connected to the top of the battery 1 or connected to the top of the battery 1 in a bonded form.

[0046] Specifically, as shown in Figure 5As shown, this type of heat-conducting component 5 can reduce the volume of the printed resistor 202. The printed resistor 202 does not need to completely pass through the through hole 401 to conduct heat to the battery 1 through the heat-conducting component 5, simplifying the structure of the printed resistor 202. At the same time, the through hole 401 can also ensure a reliable fit between the printed resistor 202 and the heat-conducting component 5, preventing the printed resistor 202 and the heat-conducting component 5 from being misaligned.

[0047] There is no limitation on the depth of the heat-conducting component 5 penetrating the through hole 401. The heat-conducting component 5 can have a part of its end located in the through hole 401, or it can completely pass through the through hole 401 and be attached to the printed resistor 202. The structural form of the heat-conducting component 5 can be flexibly selected according to the thickness of the isolation plate 4.

[0048] In one possible implementation, the printed resistor 202 is attached to the top cover or explosion-proof valve of the battery 1. This type of printed resistor 202 does not require a separate support structure and can be directly placed on the surface of the battery 1 in contact with it. The structure is compact and occupies less space.

[0049] In one possible implementation, the printed resistor 202 includes a body 2021, a metal substrate, an insulating film, and a connector. The body 2021 is disposed on the surface of the metal substrate, the insulating film covers the body 2021 and the metal substrate, and the connector passes through the insulating film to connect to the metal substrate. The printed resistor 202 can be connected to adjacent components through its own connector. This type of printed resistor 202 has a simple and effective structure and is easy to process and manufacture.

[0050] The adjacent components refer to the detection power supply 201, the signal acquisition module, and the printed resistor 202.

[0051] Specifically, the printed resistor 202 can be a single independent structure, each printed resistor 202 consisting of a separate body 2021, a metal substrate, an insulating film, and a connector; multiple printed resistors 202 can also be an integrated structure, which includes a metal substrate and multiple bodies 2021. The multiple bodies 2021 are spaced apart on the surface of the metal substrate along the extension direction of the metal substrate. The insulating film wraps the metal substrate and the multiple bodies 2021. Each body 2021 has a corresponding position with a heat-conducting element 5, and the heat from the battery 1 can be transferred to the body 2021 more directly through the heat-conducting element 5. The end of the insulating film corresponding to the metal substrate has a connection port, and the connector is located at the connection port and connected to the metal substrate.

[0052] In one possible implementation, the signal acquisition module includes a pull-up resistor 203 and a voltage sampling circuit 204. The detection power supply 201, the pull-up resistor 203, and the voltage sampling circuit 204 are connected in sequence, and the arrangement of the signal acquisition module is simple and reliable.

[0053] In a possible implementation, the preset temperature ranges from 60 DEG C to 70 DEG C, which can remind the operator in a safer state, and is safer.

[0054] Specifically, the pull-up resistor 203 is a pull-up resistor, the voltage sampling circuit 204 can be an ADC sampling of the battery management system, the voltage at the front end of the printed resistor 202 can be clamped at a high voltage through the pull-up resistor, and the ADC sampling of the battery management system can continuously and stably detect the voltage signal of the pull-up resistor, so as to judge the on-off state of the detection loop; the preset temperature can be 60 DEG C, 62 DEG C, 64 DEG C, 66 DEG C, 68 DEG C, 70 DEG C, etc.

[0055] Preferably, the preset temperature is 65 DEG C, wherein, as shown in Figure 6 When the battery 1 temperature is 65 DEG C and below, the ADC sampling can sample the corresponding voltage, at this time, it is determined that the battery 1 is normal, and there is no risk of thermal runaway; when the battery 1 temperature exceeds 65 DEG C, the printed resistor 202 is open-circuit failure, and the ADC sampling is the voltage after the pull-up resistor, at this time, it is determined that the battery 1 has a risk of thermal runaway.

[0056] In a possible implementation, as shown in Figure 3 The battery pack further comprises a thermistor 6 arranged on the flexible circuit board 3, the thermistor 6 is in contact with the battery 1 and connected with the battery management system of the battery pack through the flexible circuit board 3, and the thermistor 6 is used for detecting the temperature of the battery 1, so that the temperature of the local position of the battery 1 can be continuously collected, so as to monitor the working state of the battery 1.

[0057] Specifically, as shown in Figure 1 And Figure 3 The battery pack further comprises a sampling piece 7 arranged on the flexible circuit board 3, and the thermistor 6 is arranged on the sampling piece 7.

[0058] Further, the sampling piece 7 is a nickel sheet, and the thermistor 6 is used for collecting the temperature of the pole of the battery 1.

[0059] According to the embodiments of the utility model, on the other hand, a battery pack is provided, which comprises: a box body, at least one of the above battery packs and a battery management system, the box body has a mounting space, the battery pack is arranged in the mounting space, and the battery management system is arranged on the box body and connected with the signal acquisition module of the runaway detection assembly 2 of the battery pack.

[0060] Although the embodiments of the utility model are described in combination with the drawings, various modifications and variations can be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery pack characterized by comprising: The application relates to a battery pack and a battery management system. The battery pack comprises a plurality of batteries (1) arranged in sequence along a preset direction; a runaway detection assembly (2) comprising a detection power supply (201), a signal acquisition module and a plurality of printed resistors (202), wherein the plurality of printed resistors (202) are arranged in sequence along the preset direction, the outer wall of each battery (1) is arranged in correspondence with at least one printed resistor (202), the detection power supply (201), the signal acquisition module and the plurality of printed resistors (202) are sequentially connected and form a detection loop, the signal acquisition module is used for detecting the on-off state of the detection loop, the detection loop has a pass state in which the printed resistor (202) continuously works when the battery (1) does not reach a preset temperature, and the detection loop also has an open circuit state in which the printed resistor (202) is invalid when the battery (1) reaches the preset temperature. The battery pack further comprises a flexible circuit board (3) arranged above the batteries (1) along the preset direction, and the printed resistors (202) are arranged on the flexible circuit board (3) and arranged in correspondence with the top of the batteries (1).

2. The battery pack of claim 1, wherein, The battery pack further comprises an isolation plate (4) arranged between the flexible circuit board (3) and the batteries (1), and the isolation plate (4) is provided with a through hole (401) corresponding to the position of the printed resistor (202).

3. The battery pack of claim 2, wherein, The battery pack further comprises a heat-conducting member (5) arranged in the through hole (401), and the heat-conducting member (5) is located between the printed resistor (202) and the top of the battery (1).

4. The battery pack of claim 3, wherein, The printed resistor (202) is arranged on the top cover or explosion-proof valve of the battery (1).

5. The battery pack of claim 1, wherein, The printed resistor (202) comprises a main body (2021), a metal substrate, an insulating film and a connector, the main body (2021) is arranged on the surface of the metal substrate, the insulating film wraps the main body (2021) and the metal substrate, and the connector is connected with the metal substrate through the insulating film.

6. The battery pack of claim 5, wherein, The signal acquisition module comprises a pull resistor (203) and a voltage sampling circuit (204), the detection power supply (201), the pull resistor (203) and the plurality of printed resistors (202) are sequentially connected, and the voltage sampling circuit (204) is connected in parallel on both sides of the pull resistor (203).

7. The battery pack according to any one of claims 1 to 6, characterized by, The preset temperature ranges from 60 DEG C to 70 DEG C.

8. The battery pack according to any one of claims 1 to 6, characterized by, The battery pack further comprises a thermistor (6) arranged on the flexible circuit board (3), the thermistor (6) is in contact with the battery (1) and connected with the battery management system of a battery pack through the flexible circuit board (3), and the thermistor (6) is used for detecting the temperature of the battery (1).

9. The battery pack according to any one of claims 2 to 4, characterized by, The application relates to a battery pack and a battery management system.

10. A battery pack, characterized by, The battery pack comprises a plurality of batteries (1) arranged in sequence along a preset direction; a runaway detection assembly (2) comprising a detection power supply (201), a signal acquisition module and a plurality of printed resistors (202), wherein the plurality of printed resistors (202) are arranged in sequence along the preset direction, the outer wall of each battery (1) is arranged in correspondence with at least one printed resistor (202), the detection power supply (201), the signal acquisition module and the plurality of printed resistors (202) are sequentially connected and form a detection loop, the signal acquisition module is used for detecting the on-off state of the detection loop, the detection loop has a pass state in which the printed resistor (202) continuously works when the battery (1) does not reach a preset temperature, and the detection loop also has an open circuit state in which the printed resistor (202) is invalid when the battery (1) reaches the preset temperature. The battery pack further comprises a flexible circuit board (3) arranged above the batteries (1) along the preset direction, and the printed resistors (202) are arranged on the flexible circuit board (3) and arranged in correspondence with the top of the batteries (1). The battery pack further comprises an isolation plate (4) arranged between the flexible circuit board (3) and the batteries (1), and the isolation plate (4) is provided with a through hole (401) corresponding to the position of the printed resistor (202). The battery pack further comprises a heat-conducting member (5) arranged in the through hole (401), and the heat-conducting member (5) is located between the printed resistor (202) and the top of the battery (1). The printed resistor (202) is arranged on the top cover or explosion-proof valve of the battery (1). The printed resistor (202) comprises a main body (2021), a metal substrate, an insulating film and a connector, the main body (2021) is arranged on the surface of the metal substrate, the insulating film wraps the main body (2021) and the metal substrate, and the connector is connected with the metal substrate through the insulating film. The signal acquisition module comprises a pull resistor (203) and a voltage sampling circuit (204), the detection power supply (201), the pull resistor (203) and the plurality of printed resistors (202) are sequentially connected, and the voltage sampling circuit (204) is connected in parallel on both sides of the pull resistor (203). The preset temperature ranges from 60 DEG C to 70 DEG C. The battery pack further comprises a thermistor (6) arranged on the flexible circuit board (3), the thermistor (6) is in contact with the battery (1) and connected with the battery management system of a battery pack through the flexible circuit board (3), and the thermistor (6) is used for detecting the temperature of the battery (1). The application relates to a battery pack and a battery management system. The battery pack comprises a plurality of batteries (1) arranged in sequence along a preset direction; a runaway detection assembly (2) comprising a detection power supply (201), a signal acquisition module and a plurality of printed resistors (202), wherein the plurality of printed resistors (202) are arranged in sequence along the preset direction, the outer wall of each battery (1) is arranged in correspondence with at least one printed resistor (202), the detection power supply (201), the signal acquisition module and the plurality of printed resistors (202) are sequentially connected and form a detection loop, the signal acquisition module is used for detecting the on-off state of the detection loop, the detection loop has a pass state in which the printed resistor (202) continuously works when the battery (1) does not reach a preset temperature, and the detection loop also has an open circuit state in which the printed resistor (202) is invalid when the battery (1) reaches the preset temperature. The battery pack further comprises a flexible circuit board (3) arranged above the batteries (1) along the preset direction, and the printed resistors (202) are arranged on the flexible circuit board (3) and arranged in correspondence with the top of the batteries (1). The battery pack further comprises an isolation plate (4) arranged between the flexible circuit board (3) and the batteries (1), and the isolation plate (4) is provided with a through hole (401) corresponding to the position of the printed resistor (202). The battery pack further comprises a heat-conducting member (5) arranged in the through hole (401), and the heat-conducting member (5) is located between the printed resistor (202) and the top of the battery (1). The printed resistor (202) is arranged on the top cover or explosion-proof valve of the battery (1). The printed resistor (202) comprises a main body (2021), a metal substrate, an insulating film and a connector, the main body (2021) is arranged on the surface of the metal substrate, the insulating film wraps the main body (2021) and the metal substrate, and the connector is connected with the metal substrate through the insulating film. The signal acquisition module comprises a pull resistor (203) and a voltage sampling circuit (204), the detection power supply (201), the pull resistor (203) and the plurality of printed resistors (202) are sequentially connected, and the voltage sampling circuit (204) is connected in parallel on both sides of the pull resistor (203). The preset temperature ranges from 60 DEG C to 70 DEG C. The battery pack further comprises a thermistor (6) arranged on the flexible circuit board (3), the thermistor (6) is in contact with the battery (1) and connected with the battery management system of a battery pack through the flexible circuit board (3), and the thermistor (6) is used for detecting the temperature of the battery (1). The application relates to a battery pack and a battery management system.

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