Battery module end plate capable of detecting pressure

Abstract

The utility model relates to a battery module end plate capable of detecting pressure, which is characterized in that a plurality of battery cells are stacked to form a rectangular module, insulating sheets are respectively arranged at two ends of each battery cell, end plates are respectively arranged on the outer sides of the insulating sheets, and the end plates and the battery cells are tightly bound through binding steel belts on the end plates. Each end plate is provided with a steel belt limiting groove for limiting the steel belt, one end plate is provided with a pressure detector, the pressure detector is in signal connection with a BMS battery management system, and the pressure detector can transmit a pressure value generated by swelling of the battery cell due to a breathing effect or an internal short circuit to the BMS battery management system. According to the utility model, the abnormality of the battery cell is found in advance by detecting the pressure in real time, so that the risk is eliminated in advance, the pressure value can be uploaded to the energy storage battery monitoring system through the BMS, an external wire harness does not need to be additionally arranged, the detector is flush with the end plate, and the extra space is not occupied.

Description

Technical Field

[0001] The utility model relates to a battery module end plate capable of detecting pressure. Background Art

[0002] Currently, new energy sources are entering a new period of rapid development. Lithium batteries, with their high power density, high energy density, and low self-discharge rate, are an ideal choice for various applications, including electric vehicles, energy storage, and mobile power sources. Traditional battery modules typically consist of multiple stacked cells and end plates mounted on either side of the cell stack. These end plates are secured with steel cable ties to resist expansion forces from the cells.

[0003] During the battery module's charge-discharge cycle, the individual cells expand due to electrochemical reactions. This expansion force is generated by the confines of the space and gradually increases as the cells age. At the end of the battery module's lifespan, this expansion force can cause even greater stress on the battery end plates, leading to deformation or damage, and potentially causing safety issues.

[0004] Existing battery module end plates mainly consider the structural strength to be able to adapt to the expansion force generated by the battery, without testing the magnitude of the expansion force. Therefore, it is urgent to provide a battery end plate to solve the above technical problems. Utility Model Content

[0005] The utility model provides a battery module end plate capable of detecting pressure. By detecting pressure in real time, abnormalities in battery cells can be discovered early, thereby eliminating risks in advance. The pressure value can be uploaded to the energy storage battery monitoring system through the BMS without the need for additional external wiring harnesses. The detector is flush with the end plate and does not take up additional space.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A pressure-detectable battery module end plate, characterized in that: a plurality of battery cells are stacked in a rectangular module, insulating sheets are respectively provided at both ends of the battery cells, end plates are respectively provided on the outer sides of the insulating sheets, and steel straps are used to fasten the end plates to the battery cells;

[0008] A steel belt limiting groove is provided on the end plate for limiting the position of the steel belt. A pressure detector is provided on one of the end plates. The pressure detector is connected to the BMS battery management system by signal. The pressure detector can transmit the pressure value generated by the expansion of the battery cell due to breathing effect or internal short circuit to the BMS battery management system;

[0009] The pressure detector includes a detector body, a fixing hole, a signal line and a fixing plate. The detector body is arranged on one side of the fixing plate. The front end of the detector body is retractable. The detector body senses the expansion pressure of the battery cell by retraction. The signal line is arranged on the other side of the fixing plate. The detector body is connected to the signal line. The signal line can transmit the pressure signal sensed by the detector body to the BMS battery management system. The fixing plate is fixedly connected to the end plate through the fixing hole.

[0010] The described pressure-detectable battery module end plate, wherein: the end plate includes a main body, a detector mounting hole is set through the center of the main body, the detector mounting hole is for the detector main body to be inserted and fixed, a pair of positioning and lifting holes are symmetrically set on the main body, the lifting hole is gourd-shaped, the upper part of the battery cell is for lifting, and the lower part is for the battery cell stacking and positioning, the steel belt limiting groove is set on the main body, the steel belt limiting groove is for the steel belt to limit, a pair of end plate fixing holes are set axially through the main body for fixed connection with the cooling plate at the bottom of the battery box, a pair of detector fixing holes are set on the main body, and rivet nuts are set in the detector fixing holes, the detector fixing holes correspond to the fixing holes, and the rivet screws pass through the fixing holes and are fixed to the rivet nuts for locking the detector main body.

[0011] The pressure-detectable battery module end plate, wherein: the battery cells are fixed by gluing, and foam, mica sheets, and aerogels can also be placed.

[0012] The beneficial effects of the utility model are as follows: by detecting the pressure in real time, the abnormality of the battery cell can be discovered early, thereby eliminating the risk in advance; the pressure value can be uploaded to the energy storage battery monitoring system through the BMS, without the need for additional external wiring harness; the detector is flush with the end plate and does not take up additional space. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A structural diagram of a pressure-detectable battery module end plate.

[0014] Figure 2 This is the structural diagram of the end plate.

[0015] Figure 3 This is the main structural diagram of the end plate.

[0016] Figure 4 This is the rear view of the end plate.

[0017] Figure 5 This is a top view of the end plate.

[0018] Figure 6 This is the structural diagram of the pressure detector.

[0019] Figure 7 Another visual structure diagram of the pressure detector.

[0020] Explanation of the accompanying reference numerals: 1-battery cell; 2-end plate; 201-main body; 202-positioning and lifting hole; 203-end plate fixing hole; 204-steel belt limiting groove; 205-detector mounting hole; 206-detector fixing hole; 3-pressure detector; 301-detector body; 302-fixing hole; 303-signal line; 304-fixing plate; 4-steel belt; 5-insulating sheet. DETAILED DESCRIPTION

[0021] like Figures 1 to 7 The figure shows a pressure-detectable battery module end plate, characterized in that: a plurality of battery cells 1 are stacked in a rectangular module, the battery cells 1 are fixed by gluing, and foam, mica sheets, aerogel and other materials can also be placed. Insulating sheets 5 are respectively provided at both ends of the battery cells 1, and end plates 2 are respectively provided on the outer sides of the insulating sheets 5. Steel strips 4 are tied on the end plates 2 to tighten the end plates 2 and the battery cells 1.

[0022] A pressure detector 3 is provided on one of the end plates 2, and the end plate 2 includes a main body 201. A detector mounting hole 205 is provided at the center of the main body 201, and the detector mounting hole 205 is for the pressure detector 3 to be inserted and fixed. The pressure detector 3 is connected to the BMS battery management system signal. The pressure detector 3 can transmit the pressure value generated by the expansion of the battery cell 1 due to the breathing effect or internal short circuit to the BMS battery management system. A pair of positioning and lifting holes 202 are symmetrically provided on the main body 201. The lifting hole 202 is gourd-shaped, and the upper part thereof is for the lifting of the battery cell 1, and the lower part thereof is for the stacking and positioning of the battery cell 1. The steel belt limiting groove 204 is provided on the main body 201, and the steel belt limiting groove 204 is for limiting the steel belt 4. A pair of end plate fixing holes 203 are axially provided on the main body 201 for fixed connection with the cooling plate at the bottom of the battery box. A pair of detector fixing holes 206 are provided on the main body 201, and rivet nuts are provided in the detector fixing holes 206.

[0023] The pressure detector 3 includes a detector body 301, a fixing hole 302, a signal line 303 and a fixing plate 304. The detector body 301 is set on one side of the fixing plate 304. The front end of the detector body 301 is retractable. The detector body 301 senses the expansion pressure of the battery cell 1 by retraction. The signal line 303 is set on the other side of the fixing plate 304. The detector body 301 is connected to the signal line 303. The signal line 303 can transmit the pressure signal sensed by the detector body 301 to the BMS battery management system. The fixing plate 304 is provided with the fixing hole 302, and the fixing hole 302 corresponds to the detector fixing hole 206. The rivet screw passes through the fixing hole 302 and is fixed to the rivet nut for locking the detector body 301.

[0024] In the embodiment, an end plate 2 is pasted with an insulating sheet 5 and placed on a module stacking workbench, and then a number of battery cells 1 are stacked in sequence against the end plate 2. The battery cells 1 are fixed by applying glue, and foam, mica sheets, aerogels and other materials can also be placed. The insulating sheet 5 is pasted on the other end plate 2, and the pressure detector 3 is fixed by rivet screws and rivet nuts. The push rod on the workbench squeezes the module through the positioning and lifting holes 202 so that the module is compressed as a whole after being stressed, and the steel belt 4 is put on. Then the push rod is retracted, and the module is tightened by the steel belt after the pressure is released. At this time, the module pressure is in the initial state. The front end of the detector body 301 is retractable, and its sensing part A backward displacement will occur, and the sensed pressure value will be transmitted to the BMS battery management system through the signal line 303. As the module charges and discharges, the battery cell 1 will swell due to the breathing effect or internal short circuit, and the pressure value will also change. When the pressure value approaches the stress limit of the steel belt 4 or a sudden change occurs, the detector body 301 will upload an alarm signal through the signal line 303, and then upload it to the power station through the BMS battery management system. The power station staff will use lifting equipment to lift the abnormal module through the positioning and lifting hole 202, and place it in the battery box. Use a long screw to fix the abnormal module on the cold plate of the battery box for cooling.

[0025] The above description is only illustrative and not restrictive of the present invention. Those skilled in the art will understand that many modifications, changes or equivalents may be made without departing from the spirit and scope defined by the claims, but all of them will fall within the scope of protection of the present invention.

Claims

1. A battery module end plate capable of detecting pressure, characterized in that: A plurality of battery cells (1) are stacked to form a rectangular module, an insulating sheet (5) is provided at each end of the battery cell (1), an end plate (2) is provided on the outer side of the insulating sheet (5), and a steel band (4) is provided on the end plate (2) to fasten the end plate (2) and the battery cell (1); A steel belt limiting groove (204) is provided on the end plate (2) for limiting the steel belt (4), and a pressure detector (3) is provided on one of the end plates (2). The pressure detector (3) is connected to a BMS battery management system signal. The pressure detector (3) can transmit the pressure value generated by the expansion of the battery cell (1) due to the breathing effect or internal short circuit to the BMS battery management system; The pressure detector (3) comprises a detector body (301), a fixing hole (302), a signal line (303) and a fixing plate (304). The detector body (301) is arranged on one side of the fixing plate (304). The front end of the detector body (301) is retractable. The detector body (301) senses the expansion pressure of the battery cell (1) by retracting. The signal line (303) is arranged on the other side of the fixing plate (304). The detector body (301) is connected to the signal line (303). The signal line (303) can transmit the pressure signal sensed by the detector body (301) to the BMS battery management system. The fixing plate (304) is fixedly connected to the end plate (2) through the fixing hole (302).

2. The pressure-detectable battery module end plate according to claim 1, wherein: The end plate (2) includes a main body (201), a detector mounting hole (205) is provided at the center of the main body (201), the detector mounting hole (205) is provided for the detector main body (301) to be inserted and fixed, a pair of positioning and hoisting holes (202) are symmetrically provided on the main body (201), the hoisting holes (202) are gourd-shaped, the upper part of which is provided for the hoisting of the battery cell (1), and the lower part of which is provided for the stacking and positioning of the battery cell (1), the steel belt limiting groove (204) is provided on the main body (201), the steel belt The limiting groove (204) is used to limit the steel belt (4); a pair of end plate fixing holes (203) are axially provided on the main body (201) for fixed connection with the cooling plate at the bottom of the battery box; a pair of detector fixing holes (206) are provided on the main body (201); rivet nuts are provided in the detector fixing holes (206); the detector fixing holes (206) correspond to the fixing holes (302); rivet screws pass through the fixing holes (302) and are fixed to the rivet nuts for locking the detector main body (301).

3. The pressure-detectable battery module end plate according to claim 1, wherein: The battery cells (1) are fixed by applying glue, and foam, mica sheets, and aerogels can also be placed therebetween.

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