New energy battery pack sealing performance test equipment

Abstract

The invention discloses a new energy battery pack sealing performance test device, which comprises a detection chamber comprising a plurality of groups of accommodating cavities for accommodating batteries to be tested; the material moving device is used for moving the to-be-detected battery into the accommodating cavity; the air extractor is used for exhausting air in the accommodating cavity; the gas filling device is used for filling detection tracer gas into the to-be-detected battery so as to reach gas filling pressure; and the air tightness detection device is used for detecting the air pressure change condition in the accommodating cavity and / or the to-be-detected battery when the inflation pressure is reached, so as to realize the detection of the sealing performance of the battery pack. The structure of the detection chamber is optimized, a group of independent accommodating cavities are matched for each battery to be detected, so that the detection independence and reliability of the batteries to be detected are improved, the gas filling device and the gas tightness detection device are arranged in a matched manner, and the detection efficiency is improved. And the detection accuracy and efficiency of internal blow-by or external air leakage of the water cavity, the hydrogen cavity and the cavity in the to-be-detected battery are optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of testing equipment, and in particular to a sealing testing equipment for a new energy battery pack. Background Art

[0002] The battery pack has a water cavity, a hydrogen cavity and an air cavity. If there is gas leakage in each cavity, it will affect the overall performance of the battery and even cause safety accidents such as explosions. Therefore, it is necessary to test the sealing of the battery. The existing testing equipment has a simple testing method. It fills a cavity with gas of a specific air pressure and detects the pressure change in the cavity to know whether there is a gas leak in the cavity. However, it cannot know the specific leakage location and leakage flow, and the detection efficiency is low, which cannot meet the high-precision and high-efficiency requirements of sealing detection. Summary of the invention

[0003] In order to overcome the above technical problems, the present invention discloses a new energy battery pack sealing test device.

[0004] The technical solution adopted by the present invention to achieve the above-mentioned purpose is:

[0005] A new energy battery pack sealing test device, the device comprising:

[0006] A testing chamber, including a plurality of accommodating chambers for accommodating batteries to be tested;

[0007] A material transfer device, used for transferring the battery to be tested into the accommodating cavity;

[0008] A gas extraction device, used to discharge the gas in the accommodating cavity;

[0009] A gas filling device, used for filling the test tracer gas into the battery to be tested to reach the filling pressure;

[0010] The airtightness detection device is used to detect the change of air pressure in the accommodating cavity and / or the battery to be tested when the inflation pressure is reached, so as to realize the detection of the airtightness of the battery pack.

[0011] The above-mentioned new energy battery pack sealing test equipment, wherein the accommodating cavity includes a battery wrapping structure for wrapping the battery to be tested, the battery wrapping structure includes a battery inlet, and a sealing structure for sealing and locking with the bottom of the battery to be tested is arranged around the battery inlet, and the battery wrapping structure is connected to the exhaust device.

[0012] The above-mentioned new energy battery pack sealing test equipment, wherein the battery pack includes a water chamber, a hydrogen chamber and an air chamber;

[0013] The battery packaging structure also includes a first breath test part, a second breath test part and a third breath test part which are respectively connected to the water chamber, the hydrogen chamber and the air cavity, and the first breath test part, the second breath test part and the third breath test part are respectively connected to the gas filling device.

[0014] The above-mentioned new energy battery pack sealing test equipment, wherein the first ventilation test part includes a first air chamber and a second air chamber, the first air chamber is connected to the water cavity through a first vent, the second air chamber is connected to the water cavity through a first air outlet, and the first air chamber, the first vent, the water cavity, the first air outlet and the second air chamber are connected in sequence to form a water cavity detection ventilation path;

[0015] The second ventilation test section includes a third air chamber and a fourth air chamber, the third air chamber is connected to the hydrogen chamber through a second ventilation port, the fourth air chamber is connected to the hydrogen chamber through a second gas outlet, and the third air chamber, the second ventilation port, the hydrogen chamber, the second gas outlet and the fourth air chamber are connected in sequence to form a hydrogen chamber detection ventilation path;

[0016] The third ventilation test part includes a fifth air chamber and a sixth air chamber, the fifth air chamber is connected to the cavity through a third ventilation port, the sixth air chamber is connected to the cavity through a third air outlet, and the fifth air chamber, the third ventilation port, the cavity, the third air outlet and the sixth air chamber are connected in sequence to form a cavity detection ventilation path.

[0017] The above-mentioned new energy battery pack sealing test equipment, wherein the gas filling device includes a first gas control mechanism, a second gas control mechanism and a third gas control mechanism respectively connected to the first gas chamber, the third gas chamber and the fifth gas chamber, so as to realize the first tracer gas, the second tracer gas and the third tracer gas are respectively filled into the water chamber, the hydrogen chamber and the cavity.

[0018] The above-mentioned new energy battery pack sealing test equipment, wherein the first gas control mechanism includes a first gas source for delivering the first tracer gas, the first gas source is provided with a first on-off valve for selectively communicating with the first gas chamber, and a first gas pressure regulator for adjusting the inflation pressure of the first tracer gas;

[0019] The second gas control mechanism comprises a second gas source for delivering the second tracer gas, the second gas source is provided with a second on-off valve for selectively communicating with the third gas chamber, and a second gas pressure regulator for adjusting the inflation pressure of the second tracer gas;

[0020] The third gas control mechanism includes a third gas source for delivering the third tracer gas, and the third gas source is provided with a third on-off valve for selectively communicating with the fifth gas chamber, and a third gas pressure regulator for adjusting the inflation pressure of the third tracer gas.

[0021] In the above-mentioned new energy battery pack sealing test equipment, the airtight detection device includes a pressure detection mechanism, a gas leak detection mechanism and a flow monitoring mechanism, all of which are arranged in the accommodating cavity.

[0022] The above-mentioned new energy battery pack sealing test equipment, wherein the pressure detection mechanism includes a first pressure sensor, a second pressure sensor, a third pressure sensor and a fourth pressure sensor respectively arranged in the second air chamber, the fourth air chamber, the sixth air chamber and the battery wrapping structure;

[0023] The gas leak detection mechanism comprises a first gas leak detection assembly, a second gas leak detection assembly, a third gas leak detection assembly and a fourth gas leak detection assembly which are respectively connected to the second gas chamber, the fourth gas chamber, the sixth gas chamber and the battery packaging structure;

[0024] The flow monitoring mechanism includes a first flow meter, a second flow meter, a third flow meter and a fourth flow meter which are respectively arranged in the second air chamber, the fourth air chamber, the sixth air chamber and the battery packaging structure.

[0025] The above-mentioned new energy battery pack sealing test equipment, wherein the equipment also includes a protection device for pressure relief and explosion prevention of the battery to be tested;

[0026] The protection device comprises a first quick exhaust valve, a second quick exhaust valve and a third quick exhaust valve which are respectively connected to the second air chamber, the fourth air chamber and the sixth air chamber.

[0027] The above-mentioned new energy battery pack sealing test equipment, wherein the material moving device includes a discharge tray, a lateral movement driving mechanism for driving the discharge tray to move lateral, and a longitudinal movement driving mechanism for driving the discharge tray to move longitudinally;

[0028] A plurality of battery placement slots corresponding to the accommodating cavities are arranged on the discharge tray at intervals, and the spacing between adjacent battery placement slots is equal to the spacing between adjacent accommodating cavities.

[0029] The beneficial effects of the present invention are as follows: the present invention optimizes the structure of the detection chamber, matches a set of independent accommodating cavities for each battery to be tested, so as to improve the detection independence and reliability of the battery to be tested, and cooperates with the gas filling device and the airtight detection device to optimize the detection accuracy and efficiency of internal gas leakage or external gas leakage of the water cavity, hydrogen cavity and cavity in the battery to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0031] Figure 1 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0032] The present invention is further described below by means of specific embodiments to make the technical solution of the present invention easier to understand and grasp, rather than to limit the present invention.

[0033] Example: See Figure 1 , this embodiment provides a new energy battery pack sealing test device, the device comprising:

[0034] The testing chamber 1 includes a plurality of accommodating chambers for accommodating batteries to be tested;

[0035] A material transfer device 2, used for transferring the battery to be tested into the accommodating cavity;

[0036] A gas extraction device 3, used to discharge the gas in the accommodating cavity;

[0037] A gas filling device 4 is used to fill the test tracer gas into the battery to be tested to reach the filling pressure;

[0038] The airtightness detection device is used to detect the change of air pressure in the accommodating cavity and / or the battery to be tested when the inflation pressure is reached, so as to realize the detection of the airtightness of the battery pack.

[0039] Specifically, the structure of the detection chamber 1 is optimized, and a group of independent accommodating cavities are matched for each battery to be tested to improve the detection independence and reliability of the battery to be tested, and the gas filling device 4 and the airtight detection device are provided in cooperation to optimize the detection accuracy and efficiency of internal gas leakage or external gas leakage of the water cavity, hydrogen cavity and air cavity in the battery to be tested.

[0040] Preferably, the accommodating cavity includes a battery wrapping structure for wrapping the battery to be tested, the battery wrapping structure includes a battery inlet, and a sealing structure for sealing and locking with the bottom of the battery to be tested is arranged around the battery inlet, and the battery wrapping structure is connected to the vacuum device 3; specifically, the sealing structure preferably adopts a sealing ring and other structures; when the battery to be tested is transferred to the accommodating cavity via the material transfer device 2, the battery to be tested enters into the battery wrapping structure from the battery inlet, and the sealing structure is sealed and locked to the bottom of the battery to be tested, so that the battery to be tested is placed in the battery wrapping structure, thereby optimizing the sealing effect of subsequent airtight detection.

[0041] Preferably, the battery pack comprises a water cavity, a hydrogen cavity and an air cavity;

[0042] The battery packaging structure also includes a first breathable test part, a second breathable test part and a third breathable test part which are respectively connected to the water chamber, the hydrogen chamber and the air cavity, and the first breathable test part, the second breathable test part and the third breathable test part are respectively connected to the gas filling device 4; specifically, according to actual detection requirements, the detection tracer gas can be correspondingly introduced into the first breathable test part, the second breathable test part and / or the third breathable test part through the gas filling device 4, so as to realize the airtightness detection of different chambers of the battery pack.

[0043] Further, the first ventilation test part includes a first air chamber and a second air chamber, the first air chamber is connected to the water cavity through a first vent, the second air chamber is connected to the water cavity through a first air outlet, and the first air chamber, the first vent, the water cavity, the first air outlet and the second air chamber are connected in sequence to form a water cavity detection ventilation path;

[0044] The second ventilation test section includes a third air chamber and a fourth air chamber, the third air chamber is connected to the hydrogen chamber through a second ventilation port, the fourth air chamber is connected to the hydrogen chamber through a second gas outlet, and the third air chamber, the second ventilation port, the hydrogen chamber, the second gas outlet and the fourth air chamber are connected in sequence to form a hydrogen chamber detection ventilation path;

[0045] The third ventilation test part includes a fifth air chamber and a sixth air chamber, the fifth air chamber is connected to the cavity through a third ventilation port, the sixth air chamber is connected to the cavity through a third air outlet, and the fifth air chamber, the third ventilation port, the cavity, the third air outlet and the sixth air chamber are connected in sequence to form a cavity detection ventilation path.

[0046] Preferably, the gas filling device 4 includes a first gas control mechanism, a second gas control mechanism and a third gas control mechanism respectively connected to the first gas chamber, the third gas chamber and the fifth gas chamber, so as to respectively fill the first tracer gas, the second tracer gas and the third tracer gas into the water chamber, the hydrogen chamber and the cavity.

[0047] Further, the first gas control mechanism includes a first gas source for delivering the first tracer gas, the first gas source is provided with a first on-off valve for selectively communicating with the first gas chamber, and a first gas pressure regulator for adjusting the inflation pressure of the first tracer gas;

[0048] The second gas control mechanism comprises a second gas source for delivering the second tracer gas, the second gas source is provided with a second on-off valve for selectively communicating with the third gas chamber, and a second gas pressure regulator for adjusting the inflation pressure of the second tracer gas;

[0049] The third gas control mechanism includes a third gas source for conveying the third tracer gas, and the third gas source is provided with a third on-off valve for selectively communicating with the fifth gas chamber, and a third gas pressure regulator for adjusting the inflation pressure of the third tracer gas; wherein the first tracer gas, the second tracer gas and the third tracer gas are preferably compressed air, which is green and environmentally friendly.

[0050] Specifically, the inflation pressure of the first tracer gas is adjusted via the first gas pressure regulator, the first on-off valve is opened, and the first gas source fills the first tracer gas into the first gas chamber until the first tracer gas fills the water cavity detection ventilation path. At this time, it is detected whether there is an internal gas leakage problem in the hydrogen cavity detection ventilation path and the hole cavity detection ventilation path, and the specific leakage position can be obtained, thereby realizing the internal air tightness test of the water cavity; similarly, the internal air tightness test of the hydrogen cavity and the cavity can be carried out.

[0051] Preferably, the airtightness detection device comprises a pressure detection mechanism, a gas leakage detection mechanism and a flow monitoring mechanism, all of which are arranged in the accommodating cavity;

[0052] The pressure detection mechanism includes a first pressure sensor, a second pressure sensor, a third pressure sensor and a fourth pressure sensor respectively arranged in the second air chamber, the fourth air chamber, the sixth air chamber and the battery packaging structure; wherein the first pressure sensor, the second pressure sensor and the third pressure sensor can realize the internal leakage air tightness detection of each cavity of the battery to be tested, and the fourth pressure sensor can realize the external leakage air tightness detection of the battery to be tested; specifically, since the first air chamber, the water chamber and the second air chamber are connected, that is, the air pressure in the water chamber detection ventilation path is the same, similarly, the air pressure in the hydrogen chamber detection ventilation path is the same, and the air pressure in the cavity detection ventilation path is the same; when the first gas control mechanism fills the water chamber with the first tracer gas, the first pressure sensor, the second pressure sensor, the third pressure sensor and the fourth pressure sensor respectively detect the air pressure changes in the water chamber, the hydrogen chamber, the cavity and the battery packaging structure, so as to know whether the water chamber has internal gas blowby and / or external gas leakage problems, thereby realizing the sealing test of the water chamber; similarly, the air tightness test of the hydrogen chamber and the cavity can also be realized;

[0053] The gas leak detection mechanism includes a first gas leak detection assembly, a second gas leak detection assembly, a third gas leak detection assembly and a fourth gas leak detection assembly which are respectively connected to the second air chamber, the fourth air chamber, the sixth air chamber and the battery packaging structure; specifically, since the first air chamber, the water chamber and the second air chamber are connected, that is, the airflow in the water chamber detection ventilation path is connected, and similarly, the airflow in the hydrogen chamber detection ventilation path is connected, and the airflow in the cavity detection ventilation path is connected; when the first gas control mechanism fills the water chamber with the first tracer gas, the second gas leak detection assembly, the third gas leak detection assembly and the fourth gas leak detection assembly respectively detect whether there is gas leakage in the hydrogen chamber, the cavity and the battery packaging structure, so as to know whether there is internal gas leakage and / or external gas leakage in the water chamber, thereby completing the air tightness test of the water chamber; similarly, the air tightness test of the hydrogen chamber and the cavity can also be completed;

[0054] The flow monitoring mechanism includes a first flow meter, a second flow meter, a third flow meter and a fourth flow meter respectively arranged in the second air chamber, the fourth air chamber, the sixth air chamber and the battery packaging structure; specifically, when the first gas control mechanism fills the water cavity with the first tracer gas, the second flow meter, the third flow meter and the fourth flow meter respectively measure the gas flow in the hydrogen chamber, the cavity and the battery packaging structure, so as to know the specific gas blowby situation and further complete the air tightness test of the water cavity; by the same token, the air tightness test of the hydrogen cavity and the cavity can also be completed.

[0055] Preferably, the device further comprises a protection device for depressurizing and explosion-proofing the battery to be tested;

[0056] The protection device includes a first quick exhaust valve, a second quick exhaust valve and a third quick exhaust valve which are respectively connected to the second air chamber, the fourth air chamber and the sixth air chamber; specifically, when the equipment fails, the first quick exhaust valve, the second quick exhaust valve and / or the third quick exhaust valve can be opened to achieve rapid pressure relief and improve detection safety.

[0057] Preferably, the material moving device 2 includes a discharge tray, a transverse driving mechanism for driving the discharge tray to move transversely, and a longitudinal driving mechanism for driving the discharge tray to move longitudinally; specifically, the transverse driving mechanism and the longitudinal driving mechanism are preferably driven by a cylinder, a screw rod, a motor, etc.;

[0058] A plurality of groups of battery placement slots corresponding to the accommodating cavities are arranged on the discharge tray at intervals, and the spacing between adjacent battery placement slots is equal to the spacing between adjacent accommodating cavities; specifically, the discharge tray fully loaded with the batteries to be tested is transferred to the detection chamber 1 via the transverse drive mechanism, and then raised via the longitudinal drive mechanism, so that the batteries to be tested enter the battery packaging structure from the battery entrance.

[0059] The new energy battery pack sealing test device of the present invention comprises the following steps when in operation:

[0060] (1) The discharge tray fully loaded with the batteries to be tested is transferred to the testing chamber 1 via the transverse driving mechanism, and then raised via the longitudinal driving mechanism, so that the batteries to be tested enter the battery packaging structure from the battery entrance;

[0061] (2) The exhaust device 3 discharges gas in the battery packaging structure;

[0062] (3) The inflation pressure of the first tracer gas is adjusted by the first gas pressure regulator, the first on-off valve is opened, the first gas source fills the water cavity with the first tracer gas to detect the ventilation path, and the airtightness detection device performs an airtightness test on the water cavity, specifically as follows:

[0063] a. The first pressure sensor, the second pressure sensor, the third pressure sensor and the fourth pressure sensor respectively detect the changes in the air pressure in the water cavity, the hydrogen cavity, the air cavity and the battery packaging structure. If the first pressure sensor senses that the air pressure in the water cavity has changed, and the second pressure sensor, the third pressure sensor and / or the fourth pressure sensor sense that the air pressure in the hydrogen cavity, the air cavity and / or the battery packaging structure has changed, then the water cavity has internal gas blowby and / or external gas leakage problems;

[0064] b. The second gas leak detection assembly, the third gas leak detection assembly and the fourth gas leak detection assembly respectively detect whether there is gas leakage in the water cavity, the hydrogen cavity, the cavity and the battery packaging structure. If the second gas leak detection assembly, the third gas leak detection assembly and / or the fourth gas leak detection assembly detect that there is gas leakage in the hydrogen cavity, the cavity and / or the battery packaging structure, then the water cavity has internal gas leakage and / or external gas leakage problems;

[0065] c. The second flowmeter, the third flowmeter and the fourth flowmeter respectively measure the gas flow in the hydrogen chamber, the cavity and the battery packaging structure to obtain the specific blowby situation;

[0066] (4) Similarly, referring to step (3), the air tightness test of the hydrogen chamber and the cavity is completed;

[0067] (5) After the test is completed, the material moving device 2 moves the tested batteries out of the testing chamber 1, and the good batteries are discharged and the defective batteries are discarded.

[0068] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the present invention by using the technical means and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, all equivalent changes made according to the shape, structure and principle of the present invention without departing from the content of the technical solution of the present invention should be covered by the protection scope of the present invention.

Claims

1. A new energy battery pack sealing test equipment, It is characterized in that The device comprises: A testing chamber, including a plurality of accommodating chambers for accommodating batteries to be tested; A material transfer device, used for transferring the battery to be tested into the accommodating cavity; A gas extraction device, used to discharge the gas in the accommodating cavity; A gas filling device, used for filling the test tracer gas into the battery to be tested to reach the filling pressure; The airtightness detection device is used to detect the change of air pressure in the accommodating cavity and / or the battery to be tested when the inflation pressure is reached, so as to realize the detection of the airtightness of the battery pack.

2. The new energy battery pack sealing test equipment according to claim 1, It is characterized in that The accommodating cavity includes a battery wrapping structure for wrapping the battery to be tested, the battery wrapping structure includes a battery inlet, a sealing structure for sealing and locking with the bottom of the battery to be tested is arranged around the battery inlet, and the battery wrapping structure is connected to the exhaust device.

3. The new energy battery pack sealing test equipment according to claim 2, It is characterized in that The battery pack comprises a water cavity, a hydrogen cavity and an air cavity; The battery packaging structure also includes a first breath test part, a second breath test part and a third breath test part which are respectively connected to the water chamber, the hydrogen chamber and the air cavity, and the first breath test part, the second breath test part and the third breath test part are respectively connected to the gas filling device.

4. The new energy battery pack sealing test equipment according to claim 3, It is characterized in that The first ventilation test part includes a first air chamber and a second air chamber, the first air chamber is connected to the water cavity through a first vent, the second air chamber is connected to the water cavity through a first air outlet, and the first air chamber, the first vent, the water cavity, the first air outlet and the second air chamber are connected in sequence to form a water cavity detection ventilation path; The second ventilation test section includes a third air chamber and a fourth air chamber, the third air chamber is connected to the hydrogen chamber through a second ventilation port, the fourth air chamber is connected to the hydrogen chamber through a second gas outlet, and the third air chamber, the second ventilation port, the hydrogen chamber, the second gas outlet and the fourth air chamber are connected in sequence to form a hydrogen chamber detection ventilation path; The third ventilation test part includes a fifth air chamber and a sixth air chamber, the fifth air chamber is connected to the cavity through a third ventilation port, the sixth air chamber is connected to the cavity through a third air outlet, and the fifth air chamber, the third ventilation port, the cavity, the third air outlet and the sixth air chamber are connected in sequence to form a cavity detection ventilation path.

5. The new energy battery pack sealing test equipment according to claim 4, It is characterized in that The gas filling device includes a first gas control mechanism, a second gas control mechanism and a third gas control mechanism respectively connected to the first gas chamber, the third gas chamber and the fifth gas chamber, so as to respectively fill the first tracer gas, the second tracer gas and the third tracer gas into the water chamber, the hydrogen chamber and the cavity.

6. The new energy battery pack sealing test equipment according to claim 5, It is characterized in that The first gas control mechanism comprises a first gas source for delivering the first tracer gas, the first gas source is provided with a first on-off valve for selectively communicating with the first gas chamber, and a first gas pressure regulator for adjusting the inflation pressure of the first tracer gas; The second gas control mechanism comprises a second gas source for delivering the second tracer gas, the second gas source is provided with a second on-off valve for selectively communicating with the third gas chamber, and a second gas pressure regulator for adjusting the inflation pressure of the second tracer gas; The third gas control mechanism includes a third gas source for delivering the third tracer gas, and the third gas source is provided with a third on-off valve for selectively communicating with the fifth gas chamber, and a third gas pressure regulator for adjusting the inflation pressure of the third tracer gas.

7. The new energy battery pack sealing test equipment according to claim 4, It is characterized in that The airtight detection device comprises a pressure detection mechanism, a gas leakage detection mechanism and a flow monitoring mechanism, all of which are arranged in the accommodating cavity.

8. The new energy battery pack sealing test equipment according to claim 7, It is characterized in that The pressure detection mechanism includes a first pressure sensor, a second pressure sensor, a third pressure sensor and a fourth pressure sensor respectively arranged in the second air chamber, the fourth air chamber, the sixth air chamber and the battery packaging structure; The gas leak detection mechanism comprises a first gas leak detection assembly, a second gas leak detection assembly, a third gas leak detection assembly and a fourth gas leak detection assembly which are respectively connected to the second gas chamber, the fourth gas chamber, the sixth gas chamber and the battery packaging structure; The flow monitoring mechanism includes a first flow meter, a second flow meter, a third flow meter and a fourth flow meter which are respectively arranged in the second air chamber, the fourth air chamber, the sixth air chamber and the battery packaging structure.

9. The new energy battery pack sealing test equipment according to claim 8, It is characterized in that The device also includes a protection device for relieving pressure and preventing explosion of the battery to be tested; The protection device comprises a first quick exhaust valve, a second quick exhaust valve and a third quick exhaust valve which are respectively connected to the second air chamber, the fourth air chamber and the sixth air chamber.

10. The new energy battery pack sealing test equipment according to any one of claims 1 to 9, It is characterized in that The material moving device includes a material discharging tray, a transverse moving driving mechanism for driving the material discharging tray to move transversely, and a longitudinal moving driving mechanism for driving the material discharging tray to move longitudinally; A plurality of battery placement slots corresponding to the accommodating cavities are arranged on the discharge tray at intervals, and the spacing between adjacent battery placement slots is equal to the spacing between adjacent accommodating cavities.

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