Battery pack

Abstract

The utility model relates to a battery pack. The battery pack comprises a detector connected with the voltage sampling structure in parallel, the detector comprises two conductive polar plates which are oppositely arranged at intervals, the two conductive polar plates are electrically connected to the two busbars respectively, and when a heat exchange medium between the two conductive polar plates is not polluted, the insulation performance of the heat exchange medium is good, the conductivity of the heat exchange medium is very low, and the heat exchange medium is not polluted. The voltage of the single battery between the two busbars electrically connected with the detector is not influenced; when a heat exchange medium between the two conductive polar plates is polluted by an electrolyte from a thermal runaway single battery, conductive particles inside and outside a battery pack and the like, the electrical insulation performance of the heat exchange medium is greatly reduced, and the conductivity of the heat exchange medium is obviously increased, so that the voltage of the single battery between the two busbars electrically connected with the detector is reduced; the voltage sampling structure is used for measuring the voltage of the single battery between the two busbars electrically connected with the detector, and the conductivity abnormity of the heat exchange medium can be found according to the voltage abnormity.

Description

Technical Field

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

[0002] Currently, lithium-ion batteries have become the preferred power source for 3C consumer electronics (computers, communications, and consumer electronics). However, lithium-ion batteries are subject to temperature limitations during use; excessively high or low temperatures can affect battery safety and performance.

[0003] Currently, common temperature control methods for battery packs include air cooling and heating, cold plate liquid cooling and heating, and, in recent years, immersion liquid cooling and heating. Due to poor air heat transfer, air cooling and heating suffer from drawbacks such as high battery module energy consumption and large temperature differences between individual cells. Cold plate liquid cooling and heating offer advantages over air cooling and heating, but they also suffer from complex flow systems, high costs, and low reliability when used for large-surface cell cooling and heating. Furthermore, they suffer from large temperature differences between the top and bottom of individual cells when used for liquid cooling and heating of the bottom surface of individual cells. Immersion liquid cooling and heating utilizes an immersion fluid with excellent heat transfer and insulation properties in direct contact with the cell surface to transfer heat, improving heat transfer efficiency and reducing temperature differences between and within individual cells. However, contamination of the immersion fluid by electrolyte from thermally runaway cells or conductive particles inside and outside the battery pack can significantly reduce the electrical insulation performance of the battery pack, leading to safety concerns. Current battery packs lack a device to measure the conductivity of the immersion fluid, making it difficult to guarantee safety. Utility Model Content

[0004] The purpose of the utility model is to provide a battery pack, which can solve the technical problem that the current battery pack lacks a device for detecting the conductivity of the immersion liquid and cannot ensure the safety performance of the battery pack.

[0005] In order to solve the above problems, the utility model provides a battery pack, which includes: a shell, which has a accommodating cavity, and a liquid inlet and a liquid outlet connected to the accommodating cavity; a battery module, arranged in the accommodating cavity, the battery module includes a plurality of single cells and at least one bus, and any two adjacent single cells are electrically connected through the bus; a battery management system, arranged in the accommodating cavity, the battery management system has a voltage sampling structure, and the voltage sampling structure is electrically connected to the bus to measure the voltage of the single cells; a detector, arranged in the accommodating cavity, the detector includes two conductive electrode plates arranged opposite to each other and spaced apart, the two conductive electrode plates are electrically connected to the two bus bars respectively, and the detector is connected in parallel with the voltage sampling structure.

[0006] In some embodiments, the detector is positioned near the liquid outlet.

[0007] In some embodiments, the detector further includes an insulating spacer disposed between the two conductive electrode plates to define a distance between the two conductive electrode plates.

[0008] In some embodiments, fastening holes are respectively provided on the two conductive electrode plates, and the detector further includes two fasteners arranged at intervals, and the two fasteners respectively pass through the fastening holes on the two conductive electrode plates and are connected to the two ends of the insulating spacer.

[0009] In some embodiments, fastening holes are respectively provided on the two conductive electrode plates, and the detector also includes an insulating fastening male end and an insulating fastening female end. The insulating fastening male end passes through the fastening holes on the two conductive electrode plates, and the insulating spacer column cooperates with the insulating fastening female end to fix the two conductive electrode plates and the insulating spacer column.

[0010] In some embodiments, the battery pack has a first direction and a second direction, and the two conductive electrode plates are arranged along the first direction; the detector also includes two conductive mounting plates, the two conductive mounting plates are spaced apart along the second direction, and the two conductive mounting plates are respectively connected to the two conductive electrode plates to fix the conductive electrode plates and the shell, and the two conductive electrode plates are located between the two conductive mounting plates.

[0011] In some embodiments, the detector also includes two wiring terminals, one end of the two wiring terminals is electrically connected to the surface of the two conductive mounting plates on the side facing the guide electrode plate in the second direction, and the other end of the two wiring terminals is electrically connected to the two bus bars through two connecting wires.

[0012] In some embodiments, the detector also includes two terminals and two fixing parts. The two terminals are respectively connected to the surface of the two conductive mounting plates on the side facing the guide electrode plate in the second direction. The ends of the two terminals away from the connecting wires are respectively sleeved on the outer walls of the two terminals. The two fixing parts are respectively sleeved on the outer walls of the two terminals and are used to fix the terminals and the terminals.

[0013] In some embodiments, the detector further includes a first insulating layer, the first insulating layer covers the two electrodes, and the first insulating layer is provided with a first opening on a surface of any one conductive electrode plate close to the other conductive electrode plate.

[0014] In some embodiments, the detector further includes a second insulating layer, the second insulating layer covers the two mounting boards, and the second insulating layer is provided with second openings at positions corresponding to the two connecting terminals.

[0015] In some embodiments, the two conductive electrode plates include a first conductive electrode plate and a second conductive electrode plate, the two conductive mounting plates include a first conductive mounting plate and a second conductive mounting plate, the first conductive mounting plate and the first conductive electrode plate are integrally formed, and the second conductive mounting plate and the second conductive electrode plate are integrally formed.

[0016] The advantages of the present invention are as follows: the battery pack of the present application is provided with a detector in the accommodating cavity of the shell, the detector includes two conductive plates arranged opposite to each other and spaced apart, the two conductive plates are electrically connected to the two bus bars respectively, so that when the heat exchange medium between the two conductive plates is not contaminated, due to the good insulation performance of the heat exchange medium and the low electrical conductivity of the heat exchange medium, the two conductive plates of the detector form a capacitor, which has no effect on the voltage of the single cell between the two bus bars electrically connected to the detector; when the heat exchange medium between the two conductive plates is contaminated by the electrolyte from the thermal runaway single cell, the conductive particles inside and outside the battery pack, etc., the electrical insulation performance of the heat exchange medium is greatly improved. The current decreases, the conductivity of the heat exchange medium increases significantly, and an obvious leakage current is generated between the two conductive plates. The two conductive plates are connected, and the single cells between the two buses are discharged, so that the voltage of the single cells between the two buses electrically connected to the detector decreases. The present application connects the detector in parallel with the voltage sampling structure, and the voltage sampling structure can measure the voltage of the single cells between the two buses electrically connected to the detector. Then, the abnormal conductivity of the heat exchange medium can be detected based on the abnormal voltage of the single cells between the two buses electrically connected to the detector measured by the voltage sampling structure, and then emergency treatment measures can be initiated, thereby ultimately improving the safety and reliability of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 is a schematic structural diagram of a battery pack according to an embodiment of the present application;

[0019] Figure 2 is a plan view of a battery pack according to an embodiment of the present application;

[0020] Figure 3 is a circuit diagram of the detector, battery module, and voltage sampling structure of an embodiment of the present application;

[0021] Figure 4 This is a schematic diagram of the structure of the detector of the embodiment of the present application Figure 1 ;

[0022] Figure 5 This is a schematic diagram of the structure of the detector of the embodiment of the present application Figure 2 ;

[0023] Figure 6 Schematic diagram of an explosion of the detector according to an embodiment of the present application.

[0024] Description of reference numerals:

[0025] 100. Battery pack;

[0026] 1. Housing; 2. Battery module; 3. Detector; 4. Voltage sampling structure;

[0027] 11. Accommodation cavity; 12. Liquid inlet; 13. Liquid outlet; 21. Single cell; 22. Busbar; 41. Voltage sampling line; 31. Conductive electrode plate; 32. Insulating spacer; 33. Fastening hole; 34. Fastener; 35. Conductive mounting plate; 36. Mounting hole; 37. Terminal block; 38. Connecting wire; 39. Terminal block; 40. Fixing piece;

[0028] 311. First conductive electrode plate; 312. Second conductive electrode plate; 331. First fastening hole; 332. Second fastening hole; 341. First fastener; 342. Second fastener; 351. First conductive mounting plate; 352. Second conductive mounting plate; 361. First mounting hole; 362. Second mounting hole; 371. First wiring terminal; 372. Second wiring terminal; 381. First connecting wire; 382. Second connecting wire; 391. First terminal; 392. Second terminal; 401. First fixing member; 402. Second fixing member. DETAILED DESCRIPTION

[0029] The following describes in detail the preferred embodiments of the present invention in conjunction with the accompanying drawings to fully introduce the technical content of the present invention to those skilled in the art, to illustrate that the present invention can be implemented, to make the technical content disclosed in the present invention clearer, and to make it easier for those skilled in the art to understand how to implement the present invention. However, the present invention can be embodied in many different forms of embodiments, and the scope of protection of the present invention is not limited to the embodiments described herein. The description of the embodiments below is not intended to limit the scope of the present invention.

[0030] The directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", etc., are only directions in the drawings. The directional terms used in this document are used to explain and illustrate the present invention, and are not used to limit the scope of protection of the present invention.

[0031] In the accompanying drawings, components with the same structure are represented by the same numerical labels, and components with similar structures or functions are represented by similar numerical labels. In addition, for the sake of ease of understanding and description, the size and thickness of each component shown in the accompanying drawings are arbitrarily shown, and the present invention does not limit the size and thickness of each component.

[0032] See also Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of a battery pack according to an embodiment of the present application; Figure 2 : is a planar schematic diagram of a battery pack of an embodiment of the present application. The present application provides a battery pack 100. The battery pack 100 has a first direction M, a second direction N, and a third direction P. In the plane formed by the first direction M and the second direction N, there is an angle α between the first direction M and the second direction N, and the range of α is 45°-135°. In the plane formed by the first direction M and the third direction P, there is an angle θ between the first direction M and the third direction P, and the range of θ is 45°-135°. In the plane formed by the second direction N and the third direction P, there is an angle β between the second direction N and the third direction P, and the range of β is 45°-135°. In this embodiment, α is 90°, θ is 90°, and β is 90°, that is, the first direction M, the second direction N, and the third direction P are perpendicular to each other.

[0033] See also Figure 1 and Figure 2 The battery pack 100 includes: a shell 1, a battery module 2, a battery management system (not shown) and a detector 3.

[0034] Among them, the shell 1 has a accommodating cavity 11, a liquid inlet 12 and a liquid outlet 13. The liquid inlet 12 and the liquid outlet 13 are connected to the accommodating cavity 11. When the battery pack 100 is in use, the heat exchange medium enters the accommodating cavity 11 from the liquid inlet 12 and flows to the liquid outlet 13. The heat exchange medium is in direct contact with the surface of the single cell 21 of the battery module 2 in the accommodating cavity 11 for heat exchange, which helps to improve the heat exchange efficiency and reduce the temperature difference between and within the single cell. It should be noted that since the heat exchange medium is in direct contact with the surface of the single cell 21 of the battery module 2 for heat exchange, the heat exchange medium generally uses an organic liquid with relatively good heat transfer performance and relatively good insulation properties.

[0035] See also Figure 1 、 Figure 2 and Figure 3 , Figure 3 This is a circuit diagram of the detector, battery module, and voltage sampling structure of an embodiment of the present application. The battery module 2 is disposed within the accommodating cavity 11. The battery module 2 includes multiple single cells 21 and at least one busbar 22. Any two adjacent single cells 21 are electrically connected via the busbar 22. In this embodiment, any two adjacent single cells 21 are connected in series via a single busbar 22.

[0036] The battery management system (not shown) is disposed within the accommodating cavity 11. The battery management system includes a voltage sampling structure 4, which is electrically connected to the busbar 22 to measure the voltage of the battery cells 21. In this embodiment, the voltage sampling structure 4 is electrically connected to the busbar 22 at both ends of any battery cell 21 via a voltage sampling line 41 to measure the potential at both ends of any battery cell 21, thereby obtaining the voltage of any battery cell 21.

[0037] See also Figure 1-Figure 3 、 Figure 4 、 Figure 5 and Figure 6 , Figure 4 This is a schematic diagram of the structure of the detector of the embodiment of the present application Figure 1 ; Figure 5 This is a schematic diagram of the structure of the detector of the embodiment of the present application Figure 2 ; Figure 6 Schematic diagram of an exploded view of a detector according to an embodiment of the present invention. Detector 3 is disposed within chamber 11 and includes two conductive plates 31 disposed opposite and spaced apart from each other. The two conductive plates 31 are electrically connected to two busbars 22, respectively. Detector 3 is connected in parallel with voltage sampling structure 4. When the battery pack 100 is in use, the detector 3 is immersed in the heat exchange medium. Therefore, when the heat exchange medium between the two conductive plates 31 is not contaminated, due to the relatively good insulation performance of the heat exchange medium and the low electrical conductivity of the heat exchange medium, the two conductive plates 31 of the detector 3 form a capacitor, which has no effect on the voltage of the single battery between the two bus bars 22 electrically connected to the detector 3; when the heat exchange medium between the two conductive plates 31 is contaminated by the electrolyte from the thermal runaway single battery, the conductive particles inside and outside the battery pack, etc., the electrical insulation performance of the heat exchange medium is greatly reduced, the electrical conductivity of the heat exchange medium is significantly increased, and a significant leakage current is generated between the two conductive plates 31. The two conductive plates 31 are conductive, and the single battery 21 between the two bus bars 22 is discharged, so that the voltage of the single battery 21 between the two bus bars 22 electrically connected to the detector 3 is reduced. In the present application, the detector 3 is connected in parallel with the voltage sampling structure 4. The voltage sampling structure 4 can measure the voltage of the single cell 21 between the two bus bars 22 electrically connected to the detector 3. Then, based on the abnormal voltage of the single cell 21 between the two bus bars 22 electrically connected to the detector 3 measured by the voltage sampling structure 4, the abnormal conductivity of the heat exchange medium can be detected, and then emergency treatment measures can be initiated, thereby ultimately improving the safety and reliability of the battery pack 100.

[0038] See also Figure 1 and Figure 2Detector 3 is located near the liquid outlet. This is because the heat exchange medium flows from the liquid inlet 12 to the liquid outlet 13 in the accommodating chamber 11. If the heat exchange medium is contaminated, the detector 3 is located closer to the liquid outlet 13 than to the liquid inlet 12, and can more sensitively detect abnormalities in the heat exchange medium.

[0039] See also Figure 4-Figure 6 The two conductive electrode plates 31 are arranged along the first direction M. The two conductive electrode plates 31 can be made of a metal with good electrical conductivity, such as copper, copper alloy, aluminum, or aluminum alloy. Specifically, the two conductive electrode plates 31 are a first conductive electrode plate 311 and a second conductive electrode plate 312. The first conductive electrode plate 311 and the second conductive electrode plate 312 are arranged opposite each other and spaced apart along the first direction M.

[0040] See also Figure 4-Figure 6 The detector 3 also includes an insulating spacer 32, which is arranged between the two conductive electrode plates 31 to limit the distance between the two conductive electrode plates 31, to prevent the distance between the two conductive electrode plates 31 from being too small to cause a short circuit, and to prevent the distance between the two conductive electrode plates 31 from being too large to affect the sensitivity of the detector 3.

[0041] See also Figure 4-Figure 6 In this embodiment, fastening holes 33 are respectively provided on the two conductive electrode plates 31, and the detector 3 also includes two fasteners 34 arranged at intervals. The two fasteners 34 respectively pass through the fastening holes 33 on the two conductive electrode plates 31 and are connected to the two ends of the insulating spacer 32, thereby realizing a fixed connection between the insulating spacer 32 and the two conductive electrode plates 31. Specifically, a first fastening hole 331 is provided on the first conductive electrode plate 311, and a second fastening hole 332 is provided on the second conductive electrode plate 312 at a position corresponding to the first fastening hole 331. The two fasteners 34 are respectively a first fastener 341 and a second fastener 342. The first fastener 341 and the second fastener 342 are arranged at intervals along the first direction M. The first fastener 341 passes through the first fastening hole 331 on the first conductive electrode plate 311 and is connected to the end of the insulating spacer 32 near the first conductive electrode plate 311. The second fastener 342 passes through the second fastening hole 332 on the second conductive electrode plate 312 and is connected to the end of the insulating spacer 32 near the second conductive electrode plate 312, thereby fixing the insulating spacer 32, the first conductive electrode plate 311, and the second conductive electrode plate 312. It should be noted that the material of the fasteners 34 in this embodiment is conductive material, and therefore the two fasteners 34 need to be spaced apart to prevent the two conductive electrode plates 31 from being electrically connected through the fasteners 34. In other embodiments, the fasteners 34 may also be made of non-conductive material. In this case, the two fasteners 34 may be spaced apart or abut against each other.

[0042] In other embodiments, the two conductive electrode plates 31 are each provided with a fastening hole 33, and the detector 3 further includes an insulating fastening male end and an insulating fastening female end. The insulating fastening male end passes through the fastening holes 33 and the insulating spacers 32 on the two conductive electrode plates 31 and cooperates with the insulating fastening female end to secure the two conductive electrode plates 31 and the insulating spacers 32. Specifically, a first fastening hole 331 is provided on the first conductive electrode plate 311, and a second fastening hole 332 is provided on the second conductive electrode plate 312 at a position corresponding to the first fastening hole 331. The insulating fastening male end passes through the first fastening hole 331 on the first conductive electrode plate 311, the insulating spacers 32, and the second fastening hole 332 on the second conductive electrode plate 312 and cooperates with the insulating fastening female end to secure the insulating spacers 32, the first conductive electrode plate 311, and the second conductive electrode plate 312. For example, the insulating fastening male end is an insulating bolt, and the insulating fastening female end is an insulating nut.

[0043] See also Figure 4-Figure 6 The detector 3 further includes two conductive mounting plates 35 spaced apart along the second direction N. The two conductive mounting plates 35 are respectively connected to the two conductive electrode plates 31 to secure the conductive electrode plates 31 to the housing 1. The two conductive electrode plates 31 are located between the two conductive mounting plates 35. Specifically, the two conductive mounting plates 35 are a first conductive mounting plate 351 and a second conductive mounting plate 352. The first conductive mounting plate 351 is connected to the first conductive electrode plate 311 to secure the first conductive electrode plate 311 to the housing 1; the second conductive mounting plate 352 is connected to the second conductive electrode plate 312 to secure the second conductive electrode plate 312 to the housing 1.

[0044] See also Figure 4-Figure 6 In this embodiment, one conductive mounting plate 35 is integrally formed with one conductive electrode plate 31, and the other conductive mounting plate 35 is integrally formed with the other conductive electrode plate 31. Specifically, the first conductive mounting plate 351 is integrally formed with the first conductive electrode plate 311, and the second conductive mounting plate 352 is integrally formed with the second conductive electrode plate 312. In other embodiments, the conductive mounting plates 35 may also be connected to the conductive electrode plates 31 by welding or other fixing methods.

[0045] See also Figure 4-Figure 6In this embodiment, mounting holes 36 are respectively provided on the two conductive mounting plates 35. The detector 3 also includes two mounting parts (not shown), which are connected to the housing 1 through the mounting holes 36 on the two conductive mounting plates 35. Specifically, the two conductive mounting plates 35 are respectively a first conductive mounting plate 351 and a second conductive mounting plate 352; the first conductive mounting plate 351 is provided with a first mounting hole 361, and the second conductive mounting plate 352 is provided with a second mounting hole 362; the two mounting parts are respectively a first mounting part (not shown) and a second mounting part (not shown), the first mounting part is connected to the housing 1 through the first mounting hole 361 to fix the first conductive mounting plate 351 and the housing 1, and the second mounting part is connected to the housing 1 through the second mounting hole 362 to fix the second conductive mounting plate 352 and the housing 1. In other embodiments, the two mounting plates 35 can also be fixed in the accommodating cavity 11 of the housing 1 by welding or other processes.

[0046] See also Figure 2 and Figure 4-Figure 6 The detector 3 also includes two wiring terminals 37, one end of each of which is electrically connected to the surface of the two conductive mounting plates 35 on the side facing the conductive electrode plate 31 in the second direction N, and the other end of each of the two wiring terminals 37 is electrically connected to the two busbars 22 via two connecting wires 38. Specifically, the two wiring terminals 37 are a first wiring terminal 371 and a second wiring terminal 372. The two connecting wires 38 are a first connecting wire 381 and a second connecting wire 382. One end of the first wiring terminal 371 is electrically connected to the surface of the first conductive mounting plate 351 on the side facing the first conductive electrode plate 311 in the second direction N, and the other end of the first wiring terminal 371 is electrically connected to one busbar 22 via the first connecting wire 381; one end of the second wiring terminal 372 is electrically connected to the surface of the second conductive mounting plate 352 on the side facing the second conductive electrode plate 312 in the second direction N, and the other end of the second wiring terminal 372 is electrically connected to the other busbar 22 via the second connecting wire 382. Thus, the conductive electrode plate 31, the conductive mounting plate 35, the connection terminal 37, the connecting wire 38, and the busbar 22 are electrically connected in sequence.

[0047] See also Figure 4-Figure 6The detector 3 also includes two terminals 39 and two fixings 40. The two terminals 39 are respectively connected to the surface of the two conductive mounting plates 35 on the side facing the guide electrode plate 31 in the second direction N. The ends of the two terminal blocks 37 away from the connecting wires 38 are respectively sleeved on the outer walls of the two terminals 39. The two fixings 40 are respectively sleeved on the outer walls of the two terminals 39 and are used to fix the terminal blocks 37 and the terminals 39. Specifically, the two terminals 39 are respectively a first terminal 391 and a second terminal 392, and the two fixing members 40 are respectively a first fixing member 401 and a second fixing member 402. The end of the first terminal 371 away from the first connecting wire 381 is sleeved on the outer wall of the first terminal 391, and the first fixing member 401 is sleeved on the outer wall of the first terminal 391 and is used to fix the first terminal 371 and the first terminal 391; the end of the second terminal 372 away from the second connecting wire 382 is sleeved on the outer wall of the second terminal 392, and the second fixing member 402 is sleeved on the outer wall of the second terminal 392 and is used to fix the second terminal 372 and the second terminal 392. In other embodiments, the terminals 39 and the terminals 37 may also be fixed using processes such as welding.

[0048] See also Figure 4-Figure 6 In this embodiment, the first terminal 391 is integrally formed with the first conductive mounting plate 351, and the second terminal 392 is integrally formed with the second conductive mounting plate 352. In other embodiments, welding or other processes may be used to secure the terminal 39 to the mounting plate 35.

[0049] In some embodiments, the detector 3 further includes a first insulating layer (not shown), which covers the two electrode plates 31. The first insulating layer is provided with a first opening (not shown) on the surface of each conductive electrode plate 31 on the side closest to the other conductive electrode plate 31. In other words, the first insulating layer is provided with a first opening on the surface of the first conductive electrode plate 311 on the side closest to the second conductive electrode plate 312 and on the surface of the second conductive electrode plate 312 on the side closest to the first conductive electrode plate 311. That is, the first insulating layer may at most partially cover or not cover the surface of the first conductive electrode plate 311 on the side closest to the second conductive electrode plate 312, and the first insulating layer may at most partially cover or not cover the surface of the second conductive electrode plate 312 on the side closest to the first conductive electrode plate 311. This allows the heat exchange medium to conduct electricity between the first conductive electrode plate 311 and the second conductive electrode plate 312 when contaminated by electrolyte from a thermally runaway cell, conductive particles inside or outside the battery pack, or the like. The first insulating layer can be formed by processes such as powder spraying, painting, anodizing, and plastic dipping.

[0050] In some embodiments, a conductive layer (not shown) can be provided on the two conductive plates 31 at locations corresponding to the first openings. This layer enhances the electrical conductivity between the two conductive plates 31 when the heat exchange medium is contaminated by electrolyte from thermally runaway cells, conductive particles inside or outside the battery pack, and the like. It also prevents the heat exchange medium, contaminated by electrolyte from thermally runaway cells, conductive particles inside or outside the battery pack, from corroding the conductive plates 31. The conductive layer can be made of a conductive metal with good compatibility with the heat exchange medium, such as nickel plating, silver plating, or gold plating.

[0051] In some embodiments, the detector 3 further includes a second insulating layer (not shown) that covers the two mounting plates 35. The second insulating layer is provided with second openings (not shown) at positions corresponding to the two wiring terminals 37. In other words, the second insulating layer is provided with second openings at positions corresponding to the first wiring terminal 371 on the first conductive mounting plate 351 and at positions corresponding to the second wiring terminal 372 on the second conductive mounting plate 352, thereby enabling electrical connection between the first conductive mounting plate 351 and the first wiring terminal 371, and between the second conductive mounting plate 352 and the second wiring terminal 372. The second insulating layer can be formed using processes such as powder coating, painting, anodizing, and plastic dipping.

[0052] Combine Figure 4-Figure 6 As can be seen from the above content, the detector 3 of the present application has a simple structure, reliable performance, and is relatively convenient to process, manufacture, and install, which is conducive to improving the applicability of the detector 3.

[0053] The above is a detailed introduction to a battery pack provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the core idea of ​​the present application. At the same time, for those skilled in the art, based on the idea of ​​the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery pack, characterized in that: include: A housing (1) having a receiving chamber (11), and a liquid inlet (12) and a liquid outlet (13) communicating with the receiving chamber (11); A battery module (2) is disposed in the accommodating cavity (11), the battery module (2) comprising a plurality of single cells (21) and at least one bus bar (22), wherein any two adjacent single cells (21) are electrically connected via the bus bar (22); A battery management system is arranged in the accommodating cavity (11), the battery management system having a voltage sampling structure (4), the voltage sampling structure (4) being electrically connected to the busbar (22) to measure the voltage of the single battery (21); A detector (3) is arranged in the accommodating cavity (11), the detector (3) comprising two conductive electrode plates (31) arranged opposite to each other and spaced apart, the two conductive electrode plates (31) being electrically connected to the two bus bars (22) respectively, and the detector (3) being connected in parallel with the voltage sampling structure (4).

2. The battery pack according to claim 1, wherein: The detector (3) is arranged close to the liquid outlet (13).

3. The battery pack according to claim 1, wherein: The detector (3) further comprises an insulating spacer (32), wherein the insulating spacer (32) is arranged between the two conductive electrode plates (31) to define the distance between the two conductive electrode plates (31).

4. The battery pack according to claim 3, wherein: The two conductive electrode plates (31) are respectively provided with fastening holes (33), and the detector (3) further comprises two fasteners (34) arranged at intervals, and the two fasteners (34) respectively pass through the fastening holes (33) on the two conductive electrode plates (31) and are connected to the two ends of the insulating spacer (32).

5. The battery pack according to claim 3, wherein: The two conductive electrode plates (31) are respectively provided with fastening holes (33), and the detector (3) further comprises an insulating fastening male end and an insulating fastening female end. The insulating fastening male end passes through the fastening holes (33) on the two conductive electrode plates (31) and the insulating spacer (32) cooperates with the insulating fastening female end to fix the two conductive electrode plates (31) and the insulating spacer (32).

6. The battery pack according to claim 1, wherein: The battery pack has a first direction (M) and a second direction (N), and the two conductive electrode plates (31) are arranged along the first direction (M); The detector (3) further comprises two conductive mounting plates (35), the two conductive mounting plates (35) being spaced apart along the second direction (N), the two conductive mounting plates (35) being respectively connected to the two conductive electrode plates (31) to fix the conductive electrode plates (31) and the housing (1), and the two conductive electrode plates (31) being located between the two conductive mounting plates (35).

7. The battery pack according to claim 6, characterized in that: The detector (3) further comprises two wiring terminals (37), one end of the two wiring terminals (37) being electrically connected to the surface of the two conductive mounting plates (35) on one side facing the conductive electrode plate (31) in the second direction (N), and the other end of the two wiring terminals (37) being electrically connected to the two bus bars (22) via two connecting wires (38).

8. The battery pack according to claim 7, characterized in that: The detector (3) further comprises two terminals (39) and two fixing members (40), wherein the two terminals (39) are respectively connected to the surface of the two conductive mounting plates (35) on one side facing the conductive electrode plate (31) in the second direction (N), and the ends of the two terminal blocks (37) away from the connecting wires (38) are respectively sleeved on the outer walls of the two terminals (39), and the two fixing members (40) are respectively sleeved on the outer walls of the two terminals (39) and used to fix the terminal blocks (37) and the terminal blocks (39).

9. The battery pack according to claim 1, wherein: The detector (3) further comprises a first insulating layer, the first insulating layer covering the two electrode plates, and the first insulating layer is provided with a first opening on the surface of any one of the conductive electrode plates (31) close to the other conductive electrode plate (31).

10. The battery pack according to claim 7, characterized in that: The detector (3) further comprises a second insulating layer, the second insulating layer covers the two mounting plates, and the second insulating layer is provided with second openings at positions corresponding to the two connection terminals (37).

11. The battery pack according to claim 6, characterized in that: The two conductive electrode plates (31) include a first conductive electrode plate (311) and a second conductive electrode plate (312); the two conductive mounting plates (35) include a first conductive mounting plate (351) and a second conductive mounting plate (352); the first conductive mounting plate (351) and the first conductive electrode plate (311) are integrally formed; and the second conductive mounting plate (352) and the second conductive electrode plate (312) are integrally formed.

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