WO2023036502A1

WO2023036502A1 - Wiring method for measuring device for performance verification test for power battery pack

Info

Publication number: WO2023036502A1
Application number: PCT/EP2022/069981
Authority: WO
Inventors: Yanqiang Wang; Haiping Wu; Min Yang; Wen Feng YUE; Jingjing Zhao; Cheng Zhang; Shi Yu HU
Original assignee: Psa Automobiles Sa
Priority date: 2021-09-10
Filing date: 2022-07-18
Publication date: 2023-03-16
Also published as: CN115799686A

Abstract

A wiring method for a measuring device for a performance verification test for a power battery pack is provided according to the present disclosure, and comprises following steps: S1: opening at least one through-hole on a housing of the power battery pack, the at least one through-hole penetrating a wall of the housing; S2: installing a wiring assembly in the through-hole and sealingly connecting the wiring assembly to the through-hole to form a wiring channel; S3: wiring at least one wire of the measuring device through the housing via the wiring channel; S4: filling sealant into the wiring channel and making the sealant be in sufficient contact with each wire of the measuring device in the wiring channel. The wiring method of the present disclosure does not destroy an original sealing interface, but form a wiring channel via a wiring assembly, wherein the wiring channel provides convenience for sealant-injection and sealing.

Description

WIRING METHOD FOR MEASURING DEVICE FOR PERFORMANCE VERIFICATION TEST FOR POWER BATTERY PACK

This invention claims the priority of the Chinese patent application 202111060485. X filed on September 10, 2021, of which the content (Text, Drawings and Claims) is incorporated by reference.

RELATED FIELD

[0001] The present disclosure relates to the field of verification and testing for a power battery pack, and more particularly to a wiring method for a measuring device for a performance verification test for a power battery pack.

BACKGROUND

[0002] A power battery pack of a new energy vehicle is composed of battery cells, a battery management system, a cooling system, etc. through complex electrical and mechanical connection processes, and structure of the power battery pack is very complicated. Thereby, in terms of verification test design for performance, it is necessary to conduct evaluation through comprehensive tests on various aspects of the power battery pack. Considering requirement of a whole vehicle to its components and performance and requirement of the whole vehicle itself, the performance verification test for the power battery pack comprises the verification to electrical performance, thermal management, electrical and electromagnetic compatibility, reliability, protection function of a housing of system, and safety. At present, in some performance verification tests for the power battery pack, especially in the safety performance verification test, it is also necessary to conduct an air tightness test after wires of a measuring device are installed to the power battery pack.

[0003] For example, in a thermal runaway verification test for the power battery pack, a wiring method for wires of an existing measuring device may destroy a sealed area of the power battery pack, wherein the wires of the measuring device are led out from the inside of the power battery pack through the sealed area of the power battery pack to be connected to the external measuring device, and the sealed area may need to be resealed by other means at the position of the led-out wires. Generally, the integrity of the sealed area, such as a sealing strip, is destroyed due to the passage of the wires of the measuring device, such that the air tightness of the power battery pack is adversely affected, thereby, on one hand, cannot ensure that the power battery pack can meet the air tightness requirement of the test after the wires of the measuring device are installed, and on the other hand, cannot verify the performance of the original sealed area in the event of thermal runaway.

SUMMARY

[0004] An object of the present disclosure is to overcome the above-mentioned disadvantages in the prior art, and to provide a wiring method for a measuring device for a performance verification test for a power battery pack. The wiring method for a measuring device do not destroy an original sealing interface of the power battery pack, and can meet air tightness requirement of the measuring device after wiring.

[0005] In order to achieve the above object of the present disclosure, a wiring method for a measuring device for a performance verification test for a power battery pack is provided, and comprises following steps:

[0006] SI : opening at least one through-hole on a housing of the power battery pack, the at least one through-hole penetrating a wall of the housing;

[0007] S2: installing a wiring assembly in the through-hole and sealingly connecting the wiring assembly to the through-hole to form a wiring channel;

[0008] S3: wiring at least one wire of the measuring device through the housing via the wiring channel;

[0009] S4: filling sealant into the wiring channel and making the sealant be in sufficient contact with each wire of the measuring device in the wiring channel.

[0010] According to an optional embodiment of the present disclosure, after the step S4, the wiring method further comprises:

[0011] S5: checking air tightness of the power battery pack provided with the wiring assembly after the sealant is cured.

[0012] According to an optional embodiment of the present disclosure, the wiring assembly comprises an end portion extending to the outside of the housing, and the step S3 further comprises: attaching a hose to the end portion before wiring, such that at least one wire of the measuring device is arranged in the wiring channel and in the hose.

[0013] According to an optional embodiment of the present disclosure, the step S4 further comprises: filling the sealant into the hose and making the sealant be in sufficient contact with each wire of the measuring device in the hose.

[0014] According to an optional embodiment of the present disclosure, the wiring assembly comprises: a first threaded element, a second threaded element and a first sealing element; the first threaded element has a head portion adapted to be attached to an inner wall of the housing, and an inserting portion adapted to pass out of the housing and provided with an external thread; the second threaded element is provided with an internal thread mated with the external thread; and the step S2 comprises: sleeving the second threaded element on the inserting portion of the first threaded element, such that the first sealing element is arranged between the inner wall of the housing and the head portion.

[0015] According to an optional embodiment of the present disclosure, an outer periphery of an end portion of the inserting portion away from the head portion is provided with an annular barb structure; and the step S3 further comprises: sleeving the hose on the annular barb structure of the inserting portion and fastening the hose via a clamping element.

[0016] According to an optional embodiment of the present disclosure, the wiring assembly further comprises a hose attachment element and a second sealing element; one end of the hose attachment element is provided with an internal thread adapted to be engaged with the inserting portion, and an outer periphery of the other end is provided with an annular barb structure adapted to be engaged with the hose; and the step S3 further comprises: sleeving the hose attachment element on the inserting portion, such that the second sealing element is arranged between the hose attachment element and the inserting portion, and sleeving the hose on the annular barb structure of the hose attachment element and fastening the hose via a clamping element.

[0017] According to an optional embodiment of the present disclosure, the housing of the power battery pack comprises a lower housing and an upper cover having a sealing interface; and the through-hole is opened away from the sealing interface.

[0018] According to an optional embodiment of the present disclosure, the performance verification test for the power battery pack comprises a thermal runaway verification test.

[0019] According to an optional embodiment of the present disclosure, the at least one wire of the measuring device comprises a wire for a sensor.

[0020] The present disclosure has the following beneficial effects: [0021] A wiring method for a measuring device for a performance verification test for a power battery pack is provided according to the present disclosure, and the wiring method solves the technical problem of destroying a sealing interface caused by leading out wires of the measuring device from the sealing interface of the power battery pack. In order to ensure air tightness after wiring according to the wiring method of the present disclosure, the present disclosure provides a wiring assembly, wherein the wiring assembly forms a wiring channel for the wires of the measuring device. The wiring channel is sealed after wiring to ensure the air tightness of the power battery pack. The wiring method for a measuring device according to the present disclosure reduces the risk of failure of the performance verification test for the power battery pack caused by installation of the measuring device, and in particular, it can effectively verify the performance of the sealing interface of the power battery pack in the event of thermal runaway.

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features and advantages of the present disclosure will be better understood through the following preferred embodiments described in detail with reference to the accompanying drawings, in which the same reference numerals indicate the same or similar components.

[0023] FIG. 1 shows a schematic view of a wiring assembly connected to a housing of a power battery pack according to an embodiment of the present disclosure;

[0024] FIG. 2 shows a schematic view of the wiring assembly shown in FIG. 1; and

[0025] FIG. 3 shows a schematic view of wiring for wires of the measuring device through the wiring assembly, wherein the wires of the measuring device are used for a performance verification test for the power battery pack.

DETAILED DESCRIPTION

[0026] In order to make objects, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure are described clearly and completely in combination with the drawings in the embodiments of the disclosure hereinafter. It is apparent that the described embodiments are only some of rather than all of embodiments of the present disclosure. Based on the described embodiments of the present disclosure, all of other embodiments obtained by those skilled in the art without any creative work fall within the scope of protection of the present disclosure.

[0027] Generally, in a performance verification test for a power battery pack, a tester needs to lead wires of a measuring device out of the battery pack. For example, in a thermal runaway verification test for a power battery pack, a tester arranges about 100 sensors in the battery pack, and these sensors are connected to a measuring device arranged outside the battery pack through wires of the sensors.

[0028] In an optional embodiment, with reference to FIGS. 1 to 3, at least one wire 10 of a measuring device (not shown) is led out from a housing 30 of a power battery pack via a wiring assembly 20. As shown in FIG. 3, a wall of the housing 30 of the power battery pack is provided with a through-hole 31 penetrating through the power battery pack, and the wiring assembly 20 is installed in the through-hole 31 and is sealingly connected to the through-hole 31. With reference to FIG. 2, the wiring assembly 20 comprises a first threaded element 21, a second threaded element 22 and a first sealing element 23. The first threaded element 21 has a head portion 211 adapted to be attached to an inner wall 301 of the housing 30, and an inserting portion 212 adapted to pass out of the housing 30. The head portion 211 and the inserting portion 212 are integrally provided, and the inserting portion 212 is provided with an external thread. The second threaded element 22 (for example, a locking nut) is provided with an internal thread mated with the external thread of the inserting portion 212. The head portion 211 abuts against the inner wall 301 of the housing 30, and the first sealing element 23 (for example, a rubber sealing ring) is arranged between the inner wall 301 of the housing 30 and the head portion 211 of the first threaded element 21.

[0029] In FIG. 3, the wiring assembly 20 forms a wiring channel 201 penetrating through the housing 30. In a verification test for the power battery pack, in order to ensure air tightness of the battery pack after the measuring device is installed, sealant may be injected into the wiring channel 201. For example, the sealant may be injected from one side-opening of the wiring channel 201 located inside the housing 30, or from another side-opening of the wiring channel 201 located outside the housing 30, or from the two side-openings of the wiring channel 201 at the same time, such that the sealant may be in sufficient contact with each wire 10 in the wiring channel 201.

[0030] In a preferred embodiment, a hose 40 is further attached to an end portion of the wiring assembly 20 located outside the housing 30. By injecting the sealant into the hose 40, the hose may be squeezed to further achieve the sufficient contact between the sealant and each wire 10. The hose 40 further plays a role of extending the wiring channel 201, such that the wiring channel 201 is sealed for a longer length. Preferably, the hose 40 extends the wiring channel 201 by 30cm-50cm.

[0031] In an optional embodiment, an outer periphery of an end portion of the inserting portion 212 of the first threaded element 21 away from the head portion 211 is provided with an annular barb structure (not shown). The hose 40 is directly sleeved on the annular barb structure and is fastened via a clamping element. In this embodiment, a position of the inserting portion 212 adjacent to the head portion 211 is provided with the external thread, and a position of the inserting portion 212 away from the head portion 211 is provided with the annular barb structure.

[0032] In another optional embodiment, as shown in FIG. 3, the wiring assembly 20 further comprises a hose attachment element 24 and a second sealing element 25. One end of the hose attachment element 24 is provided with an internal thread adapted to be engaged with the inserting portion 212, and an outer periphery of the other end is provided with an annular barb structure (not shown) adapted to be engaged with the hose 40. The hose 40 is fastened on the hose attachment element 24 via a clamping element 41 (for example, a clip), and the second sealing element 25 is arranged between the hose attachment element 24 and the inserting portion 212. In this embodiment, the portion of the inserting portion 212 passing out of the housing 30 is provided with an external thread.

[0033] Through the above arrangement of the wiring assembly 20, damage to a sealing interface of the housing 30 of the power battery pack is avoided. Further, in combination with the wiring method for a measuring device disclosed below, the air tightness of the power battery pack after wiring of the measuring device is ensured.

[0034] A wiring method for a measuring device for a performance verification test for a power battery pack comprises following steps:

[0035] SI: opening at least one through-hole 31 on the housing 30 of the power battery pack, wherein the at least one through-hole 31 penetrates the wall of the housing 30. Optionally, one to three through-holes 31 may be opened. The housing 30 comprises a lower housing and an upper cover (not shown) having a sealing interface. The sealing interface between the lower housing and the upper cover is provided with a sealing ring, and the through-hole 31 is opened away from the sealing interface. Optionally, the through-hole 31 is provided on a side wall formed by the lower housing and/or on a top wall formed by the upper cover.

[0036] S2: installing the wiring assembly 20 in the through-hole 31 and sealingly connecting the wiring assembly 20 to the through-hole 31 to form the wiring channel 201. Specifically, the first sealing element 23 is firstly sleeved on the inserting portion 212 of the first threaded element 21, and the first threaded element 21 is then passed out of the housing 30. Then the second threaded element 22 is sleeved on the inserting portion 212, such that the first sealing element 23 is clamped between the inner wall 301 of the housing 30 and the head portion 211 of the first threaded element 21, thereby ensuring the air tightness at the through-hole 31.

[0037] S3: wiring at least one wire 10 (such as a wire for a sensor, including but not limited to a wire for a temperature sensor, a pressure sensor, a voltage and current sensor, a smoke sensor, etc.) of the measuring device through the housing 30 via the wiring channel 201. Optionally, the step S3 further comprises: attaching the hose 40 to the end portion of the wiring assembly 20 extending to the outside of the housing 30 before wiring, such that the at least one wire 10 of the measuring device is arranged in the wiring channel 201 and in the hose 40. The hose 40 forms an extension channel of the wiring channel 201 to facilitate subsequent sealant-injection and sealing.

[0038] S4: filling the sealant into the wiring channel 201 and making the sealant be in sufficient contact with each wire 10 of the measuring device in the wiring channel 201. Optionally, in the wiring method where the hose 40 is attached to the wiring assembly 20, the step S4 further comprises: filling the sealant into the hose 40, and making the sealant be in sufficient contact with each wire of the measuring device in the hose 40, such that the tester may squeeze the hose 40 to make the sealant fill up the wiring channel 201 and its extension channel.

[0039] Optionally, after the step S4, the wiring method further comprises:

[0040] S5: checking the air tightness of the power battery pack provided with the wiring assembly 20 after the sealant is cured, so as to effectively verify the performance of the sealing interface of the housing 30 and of an exhaust valve in the event of thermal runaway, when the performance verification test, especially the thermal runaway verification test, of the power battery pack is conducted. [0041] Thereby, the power battery pack installed with the measuring device and using the above wiring method has good air tightness, which meets air tightness requirement of the performance verification test for the power battery pack.

[0042] In view of the above, the wiring method for a measuring device according to the present disclosure is adapted to any test where a wire needs to be led out from the inside of a power battery pack. Compared with the prior art, the wiring method of the present disclosure does not destroy an original sealing interface, but forms a wiring channel via a wiring assembly, wherein the wiring channel provides convenience for sealant-injection and sealing.

[0043] Although some exemplary embodiments have been described herein, various modifications may be made to these embodiments without departing from the spirit of the present disclosure, and all of these modifications belong to the concept of the present disclosure and fall within the scope of protection defined by the appended claims of the present disclosure.

[0044] The specific embodiments disclosed herein are only used to illustrate the present disclosure. It is obvious to those skilled in the art that various modifications may be made according to the teachings herein, and the present disclosure may be implemented in various equivalent manners. Thereby, the specific embodiments of the present disclosure disclosed above are merely illustrative, and the scope of protection of the present disclosure is not limited to the details of the structure or design disclosed herein, unless otherwise specified in the claims. Thereby, various substitutions, combinations or modifications may be made to the specific exemplary embodiments disclosed above, and all of variants thereof fall within the scope of the present disclosure.

Claims

1. A wiring method for a measuring device for a performance verification test for a power battery pack, comprising following steps:

SI : opening at least one through-hole on a housing of the power battery pack, the at least one through-hole penetrating a wall of the housing;

S2: installing a wiring assembly in the through-hole and sealingly connecting the wiring assembly to the through-hole to form a wiring channel;

S3 : wiring at least one wire of the measuring device through the housing via the wiring channel;

S4: filling sealant into the wiring channel and making the sealant be in sufficient contact with each wire of the measuring device in the wiring channel.

2. The wiring method for a measuring device according to claim 1, wherein after the step S4, the method further comprises a step:

S5: checking air tightness of the power battery pack provided with the wiring assembly after the sealant is cured.

3. The wiring method for a measuring device according to claim 2, wherein the wiring assembly comprises an end portion extending to the outside of the housing, and wherein the step S3 further comprises: attaching a hose to the end portion before wiring, such that at least one wire of the measuring device is arranged in the wiring channel and in the hose.

4. The wiring method for a measuring device according to claim 3, wherein the step S4 further comprises: filling the sealant into the hose and making the sealant be in sufficient contact with each wire of the measuring device in the hose.

5. The wiring method for a measuring device according to claim 3 or 4, wherein the wiring assembly comprises: a first threaded element, a second threaded element and a first sealing element; wherein the first threaded element has a head portion adapted to be attached to an inner wall of the housing, and an inserting portion adapted to pass out of the housing and provided with an external thread; wherein the second threaded element is provided with an internal thread mated with the external thread; and wherein the step S2 comprises: sleeving the second threaded element on the inserting portion of the first threaded element, such that the first sealing element is arranged between the inner wall of the housing and the head portion.

6. The wiring method for a measuring device according to claim 5, wherein an outer periphery of an end portion of the inserting portion away from the head portion is provided with an annular barb structure; and wherein the step S3 further comprises: sleeving the hose on the annular barb structure of the inserting portion and fastening the hose via a clamping element.

7. The wiring method for a measuring device according to claim 5, wherein the wiring assembly further comprises a hose attachment element and a second sealing element; wherein one end of the hose attachment element is provided with an internal thread adapted to be engaged with the inserting portion, and an outer periphery of the other end is provided with an annular barb structure adapted to be engaged with the hose; and wherein the step S3 further comprises: sleeving the hose attachment element on the inserting portion, such that the second sealing element is arranged between the hose attachment element and the inserting portion, and sleeving the hose on the annular barb structure of the hose attachment element and fastening the hose via a clamping element.

8. The wiring method for a measuring device according to claim 1, wherein the housing of the power battery pack comprises a lower housing and an upper cover having a sealing interface; and wherein the through-hole is opened away from the sealing interface.

9. The wiring method for a measuring device according to claim 1, wherein the wiring method for a measuring device is used for a thermal runaway verification test.

10. The wiring method for a measuring device according to claim 1, wherein the at least one wire of the measuring device comprises a wire for a sensor.