Battery detection device

Abstract

The invention relates to a battery detection device, and the device comprises at least two access channels, and one access channel corresponds to one battery pack; one first detection channel corresponds to one access channel, and the second end of the first detection channel is connected with the second end of the corresponding access channel; at least two second detection channels, one second detection channel corresponds to one access channel, the first end of the second detection channel is a connecting end connected with a gas detection device, and the second end of the second detection channel is connected with the second end of the corresponding access channel; and the control device is set to control the first detection channel and the second detection channel corresponding to the first group of access channels to be in a conducting state and a closed state respectively and control the first detection channel and the second detection channel corresponding to the second group of access channels to be in a closed state and a conducting state respectively in the first stage. The efficiency of detecting the battery pack can be improved.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the technical field of battery detection, and more specifically, to a battery detection device. Background Art

[0002] As a common power source, the safety of batteries has attracted widespread attention from consumers. At present, if leakage occurs inside the battery pack, safety issues such as abnormal battery pack sampling, EV restrictions or spontaneous combustion will occur.

[0003] In the prior art, when detecting battery pack leakage, a vacuum pump is usually used to create a negative pressure inside the battery pack, and then a mass spectrometer is used to detect the gas inside the battery pack to confirm whether the battery pack has leakage. However, when there are a large number of battery packs, detecting each battery pack one by one will take too long to detect. Summary of the invention

[0004] One purpose of the embodiments of the present disclosure is to provide a new technical solution for a battery detection device.

[0005] According to a first aspect of the present disclosure, a battery detection device is provided, the battery detection device comprising:

[0006] At least two access channels, a first end of the access channel is a connection end of the battery pack, and one access channel corresponds to one battery pack;

[0007] At least two first detection channels, one first detection channel corresponds to one access channel, a first end of the first detection channel is a connection end connected to a gas extraction device, and a second end of the first detection channel is connected to a second end of the corresponding access channel;

[0008] at least two second detection channels, one second detection channel corresponds to one access channel, a first end of the second detection channel is a connection end connected to a gas detection device, and a second end of the second detection channel is connected to a second end of the corresponding access channel; and

[0009] A control device, wherein the control device is configured to: in a first stage, control the first detection channel and the second detection channel corresponding to the first group of access channels to be in an on state and a closed state respectively, so as to evacuate the first group of battery packs connected to the first group of access channels, and control the first detection channel and the second detection channel corresponding to the second group of access channels to be in a closed state and a on state respectively, so as to perform gas detection on the second group of battery packs connected to the second group of access channels; wherein the first group of access channels and the second group of access channels respectively include at least one access channel, and the first group of access channels and the second group of access channels include different access channels.

[0010] Optionally, the control device is further configured to: in a second stage after the first stage, control the first detection channel and the second detection channel corresponding to the first group of access channels to be in a closed state and a conducting state, respectively, to perform gas detection on the first group of battery packs, and control the first detection channel and the second detection channel corresponding to the third group of access channels to be in a conducting state and a closed state, respectively, to degas the third group of battery packs connected to the third group of access channels; wherein the third group of access channels includes at least one access channel, and the first group of access channels, the second group of access channels and the third group of access channels include different access channels.

[0011] Optionally, the battery detection device further comprises an air pressure detection device for detecting the air pressure inside the battery pack, and the air pressure detection device is connected to the control device;

[0012] The control device is also configured to: in the first stage, obtain the internal air pressure value of the first battery pack detected by the air pressure detection device, and when the internal air pressure value is less than or equal to a set threshold, end the first stage and start the second stage.

[0013] Optionally, the control device is further configured to: if the internal air pressure value is still greater than the set threshold when the first stage reaches a set time, end the first stage and cancel the second stage.

[0014] Optionally, when the first battery group connected to the first access channel is replaced with a fourth battery group, the control device is configured to: in the final stage, control the first detection channel and the second detection channel corresponding to the last access channel to be in a closed state and a conducting state, respectively, to perform gas detection on the first battery group, and control the first detection channel and the second detection channel corresponding to the first access channel to be in a conducting state and a closed state, respectively, to degas the fourth battery group connected to the first access channel.

[0015] Optionally, the first detection channel is provided with a first valve, and the second detection channel is provided with a second valve;

[0016] The control device is configured to: control the first valve so that the first detection channel is in a closed state or an open state, and control the second valve so that the second detection channel is in a closed state or an open state.

[0017] Optionally, each group of access channels is an access channel, and each access channel corresponds to a first detection channel and a second detection channel.

[0018] Optionally, the first detection channel and the second detection channel corresponding to the access channel are provided with a common third valve, and the control device changes the states of the first detection channel and the second detection channel by controlling the third valve, wherein:

[0019] When the third valve is in a first state, the first detection channel is in an open state, and the second detection channel is in a closed state;

[0020] When the third valve is in a second state, the first detection channel is in a closed state, and the second detection channel is in a conducting state;

[0021] When the third valve is in a third state, the first detection channel is in a closed state, and the second detection channel is in a closed state.

[0022] Optionally, the control device is arranged to control at most one third valve in the first state, and at most one third valve in the second state in the same phase.

[0023] Optionally, each of the first detection channels is provided with a common fourth valve, each of the second detection channels is provided with a common fifth valve, and the control device changes the state of the first detection channel by controlling the fourth valve, and changes the state of the second detection channel by controlling the fifth valve, wherein:

[0024] When the fourth valve is in the first state, the first detection channel corresponding to one group of access channels is turned on, and the first detection channels corresponding to the other groups of access channels are turned off; when the fourth valve is in the second state, the first detection channels corresponding to the respective groups of access channels are turned off;

[0025] When the fifth valve is in the first state, the second detection channel corresponding to one group of access channels is turned on, and the second detection channels corresponding to the remaining groups of access channels are turned on and closed; when the fifth valve is in the second state, the second detection channels corresponding to each group of access channels are turned on and closed.

[0026] Optionally, a group of first detection channels connected to the fourth valve and a group of second detection channels connected to the fifth valve correspond to different groups of access channels.

[0027] One beneficial effect of the embodiments of the present disclosure is that each battery pack can be connected to an access channel, and the control device can control a first detection channel corresponding to a group of access channels to evacuate a group of battery packs. At the same time, the second detection channel corresponding to another group of access channels can be controlled to perform gas detection on another group of battery packs that has been evacuated, thereby shortening the detection time and effectively improving the efficiency of detecting battery leakage.

[0028] Other features and advantages of the embodiments of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the embodiments of the present disclosure.

[0030] Figure 1 is a schematic structural diagram of a battery detection device according to an embodiment;

[0031] Figure 2 is a structural schematic diagram of a battery detection device according to another embodiment;

[0032] Figure 3 is a structural schematic diagram of a battery detection device according to another embodiment;

[0033] Figure 4 is a schematic structural diagram of a battery detection device according to another embodiment. DETAILED DESCRIPTION

[0034] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0035] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0036] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0037] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0038] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0039] Below we first combine the attached Figures 1 to 4 The battery detection device according to the embodiment of the present application is described in detail.

[0040] The present invention provides a battery detection device, such as Figure 1As shown, the battery detection device includes: at least two access channels 100, the first end of the access channel 100 is the connection end of the battery pack, and one access channel 100 corresponds to one battery pack; at least two first detection channels 200, one first detection channel 200 corresponds to one access channel 100, the first end of the first detection channel 200 is the connection end connected to the exhaust device 400, and the second end of the first detection channel 200 is connected to the second end of the corresponding access channel 100; at least two second detection channels 200, one second detection channel 200 corresponds to one access channel 100, the first end of the second detection channel 200 is the connection end connected to the gas detection device 500, and the second end of the second detection channel 200 is connected to the second end of the corresponding access channel 100. The two ends are connected; and a control device, the control device is configured to: in the first stage, control the first detection channel 200 and the second detection channel 200 corresponding to the first group of access channels 100 to be in an on state and a closed state respectively, so as to evacuate the first group of battery packs connected to the first group of access channels 100, and control the first detection channel 200 and the second detection channel 200 corresponding to the second group of access channels 100 to be in a closed state and a on state respectively, so as to perform gas detection on the second group of battery packs connected to the second group of access channels 100; wherein the first group of access channels 100 and the second group of access channels 100 respectively include at least one access channel 100, and the first group of access channels 100 and the second group of access channels 100 include different access channels 100.

[0041] The on state of the first detection channel 200 is that the first detection channel 200 is connected to the corresponding access channel 100, and the closed state of the first detection channel 200 is that the first detection channel 200 is not connected to the corresponding access channel 100. The on state of the second detection channel 300 is that the second detection channel 300 is connected to the corresponding access channel 100, and the closed state of the second detection channel 300 is that the second detection channel 300 is not connected to the corresponding access channel 100.

[0042] In some examples, the access channel 100 is a channel connected to the battery pack, and the channel can be a pipe, and the shape of the cross section of the pipe can be square or circular, etc., which is not limited here. Each group of access channels 100 can be one access channel 100 or multiple access channels 100, which is not limited here. Each access channel 100 is used to access a battery pack, that is, each group of battery packs can be connected to a group of access channels 100 respectively.

[0043] In some examples, the first detection channel 200 is a channel connected to the air extraction device 400, and the channel may be a pipe, and the shape of the cross section of the pipe may be square or circular, etc., which is not limited here. The first detection channel 200 may be connected to the access channel 100, so that the air extraction device 400 can extract air from the inside of the battery pack through the first detection channel 200 and the access channel 100. Among them, the air extraction device 400 may be an air extraction pump.

[0044] In some examples, the second detection channel 200 is a channel connected to the gas detection device 500, which can be a pipe, and the shape of the cross section of the pipe can be square or circular, etc., which is not limited here. The second detection channel 200 can be connected to the access channel 100, so that the gas detection device 500 can perform gas detection on the inside of the battery pack that has been evacuated through the second detection channel 200 and the access channel 100. Among them, the gas detection device 500 can be a mass spectrometer.

[0045] In some examples, the control device can control the detection channel to be in an on state or a closed state. For example, the control device is a control chip, and the control chip can output a corresponding control signal so that the solenoid valve of the detection channel responds to the control signal to operate to realize the detection channel to be on or off. For another example, the control device is a clamping device, and the detection channel is a flexible pipe, so that the control device can close the first detection channel 200 by clamping the first detection channel 200, and after the control device is reset, the first detection channel 200 can realize the first detection channel 200 to be on under its own elastic action.

[0046] In some examples, each battery pack may be first evacuated by the evacuation device 400 and then the gas detection device 500 may detect whether there is leakage inside the battery pack. That is, in a stage before the first stage, the control device may control the first detection channels 200 corresponding to the second battery packs to evacuate. In the first stage, the control device may perform gas detection on the second battery packs.

[0047] by Figure 1 For example, battery pack 1 and battery pack 2 are the first battery pack, and battery pack 3 and battery pack 4 are the second battery pack. In the first stage, the control device controls the first detection channel 200 corresponding to battery pack 1 and battery pack 2 to be in the on state, and the second detection channel 200 corresponding to battery pack 1 and battery pack 2 to be in the closed state, so as to evacuate battery pack 1 and battery pack 2. At the same time, the control device controls the second detection channel 200 corresponding to battery pack 3 and battery pack 4 to be in the on state, and the first detection channel 200 corresponding to battery pack 3 and battery pack 4 to be in the closed state, so as to perform gas detection on battery pack 3 and battery pack 4 that have been evacuated.

[0048] In these examples, each battery pack can be connected to an access channel 100, and the control device can control a first detection channel 200 corresponding to a group of access channels 100 to evacuate a group of battery packs. At the same time, the control device can control a second detection channel 200 corresponding to another group of access channels 100 to perform gas detection on another group of battery packs that has been evacuated, thereby shortening the detection time and effectively improving the efficiency of detecting battery leakage.

[0049] In some embodiments, the control device is further configured to: in a second stage after the first stage, control the first detection channel 200 and the second detection channel 200 corresponding to the first group of access channels 100 to be in a closed state and a conductive state, respectively, to perform gas detection on the first group of battery packs, and control the first detection channel 200 and the second detection channel 200 corresponding to the third group of access channels 100 to be in a conductive state and a closed state, respectively, to degas the third group of battery packs connected to the third group of access channels 100; wherein the third group of access channels 100 includes at least one access channel 100, and the first group of access channels 100, the second group of access channels 100 and the third group of access channels 100 include different access channels 100.

[0050] by Figure 1 For example, battery pack 1 is the first battery pack, battery pack 2 is the second battery pack, and battery pack 3 is the second battery pack. In the second stage after the first stage, the control device controls the first detection channel 200 corresponding to battery pack 1 to be in a closed state, and the second detection channel 200 corresponding to battery pack 1 to be in a conducting state, so as to perform gas detection on battery pack 1. At the same time, the control device controls the first detection channel 200 corresponding to battery pack 3 to be in a conducting state, and the second detection channel 200 corresponding to battery pack 3 to be in a closed state, so as to exhaust gas from battery pack 3.

[0051] In these examples, the control device controls one group of battery packs to evacuate air and another group to perform gas detection at different stages, thereby realizing cyclic control to perform leakage detection on each battery pack, thereby realizing intelligent leakage detection.

[0052] In some embodiments, the battery detection device also includes an air pressure detection device 600 for detecting the internal air pressure of the battery pack, and the air pressure detection device 600 is connected to the control device; the control device is also configured to: in the first stage, obtain the internal air pressure value of the first group of battery packs detected by the air pressure detection device 600, and when the internal air pressure value is less than or equal to the set threshold, end the first stage and start the second stage.

[0053] In some examples, Figure 2 As shown, the air pressure detection device 600 may be a vacuum gauge, and is disposed at an interface of the air pressure detection device 600 to detect the air pressure value of a group of battery packs being evacuated.

[0054] In some examples, the set threshold is, for example, -100 KPa, -90 KPa, or -70 KPa, etc., which is not limited here.

[0055] In these examples, by providing the gas pressure detection device 600 , it is possible to determine whether each battery pack has reached the internal gas pressure value required for gas detection, thereby improving the working efficiency of the gas extraction device 400 .

[0056] In some embodiments, the control device is further configured to: if the internal air pressure value is still greater than a set threshold when the first stage reaches a set duration, end the first stage and cancel the second stage.

[0057] In some examples, the set duration can be 5 seconds, 20 seconds, 1 minute, etc., which is not limited here.

[0058] In some examples, the battery detection device can be configured with a corresponding language broadcast device or display device, so that when the internal air pressure value of a battery pack reaches a set time and is still greater than a set threshold, a prompt message that the battery pack is damaged can be displayed to the detection personnel through the voice broadcast device or display device.

[0059] In these examples, by providing the air pressure detection device 600, it is possible to quickly determine whether a battery pack has a gas leak, thereby reducing the number of steps required to perform gas detection on the battery pack and improving detection efficiency.

[0060] In some embodiments, when the first battery group connected to the first access channel 100 is replaced with a fourth battery group, the control device is configured to: in the final stage, control the first detection channel 200 and the second detection channel 200 corresponding to the last access channel 100 to be in a closed state and a conductive state, respectively, to perform gas detection on the first battery group, and control the first detection channel 200 and the second detection channel 200 corresponding to the first access channel 100 to be in a conductive state and a closed state, respectively, to evacuate the fourth battery group connected to the first access channel 100.

[0061] by Figure 1For example, the first battery group is battery group 1, the second battery group is battery group 2, the third battery group is battery group 3, the last battery group is battery group 4, and the fourth battery group is battery group 5. The control device performs gas detection after degassing battery groups 1 to 4 in sequence. In this process, the detected battery group 1 can be replaced with battery group 5, and the control device controls the first detection channel 200 corresponding to battery group 4 to be in a closed state, and the second detection channel 200 corresponding to battery group 4 to be in a conducting state, so as to perform gas detection on battery group 4. At the same time, under the premise that the control device determines that the battery group 4 has completed the docking with the access channel 100 through the sensing device set in the access channel 100, the first detection channel 200 corresponding to the battery group 5 is controlled to be in a conducting state, and the second detection channel 200 corresponding to the battery group 5 is in a closed state, so as to degas the battery group 5. Among them, the sensing device can be an infrared sensor or a pressure sensor, etc., which is not limited here.

[0062] In other words, after completing one round of cyclic control to detect leakage on each battery pack, the control device can replace the battery pack that has been detected with the battery pack to be detected and start the next round of cyclic control, so as to further realize intelligent leakage detection.

[0063] In some embodiments, the first detection channel 200 is provided with a first valve, and the second detection channel 200 is provided with a second valve; the control device is configured to: control the first valve so that the first detection channel 200 is in a closed state or a conducting state, and control the second valve so that the second detection channel 200 is in a closed state or a conducting state.

[0064] In some examples, the first valve and the second valve are both two-position solenoid valves, and the first valve and the second valve can be operated under the control of the control device, so that the first detection channel 200 or the second detection channel 200 is in an on state or a closed state.

[0065] In other words, by providing a two-position valve in each detection channel, the flexibility of battery pack leakage detection can be improved.

[0066] In some embodiments, each group of access channels 100 is an access channel 100 , and each access channel 100 corresponds to a first detection channel 200 and a second detection channel 200 .

[0067] by Figure 2For example, the first valve V1, the first valve V3, the first valve V5, the second valve V2, the second valve V4, and the second valve V6 are all normally closed valves. In stage 1, the control device can control the first valve V1 to open, so that the exhaust device 400 exhausts the battery pack 1. In stage 2, the control device can control the second valve V2 to open, so that the gas detection device 500 performs gas detection on the battery pack 1, and the control device controls the first valve V3 to open, so that the exhaust device 400 exhausts the battery pack 2. In stage 3, the control device can control the second valve V4 to open, so that the gas detection device 500 performs gas detection on the battery pack 2, and the control device controls the first valve V5 to open, so that the exhaust device 400 exhausts the battery pack 3. In stage 4, the control device controls the second valve V6 to open, so that the gas detection device 500 performs gas detection on the battery pack 3.

[0068] In some embodiments, the first detection channel 200 and the second detection channel 200 corresponding to the access channel 100 are provided with a common third valve, and the control device changes the states of the first detection channel 200 and the second detection channel 200 by controlling the third valve, wherein: when the third valve is in a first state, the first detection channel 200 is in an on state, and the second detection channel 200 is in a closed state; when the third valve is in a second state, the first detection channel 200 is in a closed state, and the second detection channel 200 is in an on state; when the third valve is in a third state, the first detection channel 200 is in a closed state, and the second detection channel 200 is in an on state.

[0069] In some examples, the third valve may be a three-position solenoid valve, so that in the first detection channel 200 and the second detection channel 200, one of them is in an on state, the other is in a closed state, or both are in a closed state.

[0070] In some embodiments, the control device is arranged to control at most one third valve in the first state and at most one third valve in the second state during the same phase.

[0071] by Figure 4 For example, in the same stage, the control device can control the third valve V7 corresponding to the battery group 2 to be in the first state, so that the vacuum device 400 vacuums the battery group 2, and the control device can control the third valve V7 corresponding to the battery group 1 to be in the second state, so that the gas detection device 500 performs gas detection on the vacuumed battery group 1.

[0072] by Figure 4 For example, in the same stage, the control device can control the third valve V7 corresponding to the battery pack 1 to be in the first state, so that the exhaust device 400 exhausts the battery pack 1.

[0073] by Figure 4For example, in the same stage, the control device can control the third valve V7 corresponding to the battery pack 4 to be in the second state, so that the gas detection device 500 performs gas detection on the battery pack 4 that has been evacuated.

[0074] In these examples, by providing a plurality of third valves, the leakage detection of each battery pack can be controlled by the same third valve, which can improve the flexibility of the battery pack leakage detection.

[0075] In some embodiments, each first detection channel 200 is provided with a common fourth valve, and each second detection channel 200 is provided with a common fifth valve. The control device changes the state of the first detection channel 200 by controlling the fourth valve, and changes the state of the second detection channel 200 by controlling the fifth valve, wherein: when the fourth valve is in the first state, the first detection channel 200 corresponding to one group of access channels 100 is turned on, and the first detection connections corresponding to the remaining groups of access channels 100 are closed; when the fourth valve is in the second state, the first detection channels 200 corresponding to each group of access channels 100 are closed; when the fifth valve is in the first state, the second detection channel 200 corresponding to one group of access channels 100 is turned on, and the second detection connections corresponding to the remaining groups of access channels 100 are closed; when the fifth valve is in the second state, the second detection channels 200 corresponding to each group of access channels 100 are closed.

[0076] In some examples, the fourth valve may be a multi-position solenoid valve, and the number of positions of the fourth valve is determined according to the number of the first detection channels 200, and the specific number of positions is not limited here. The fifth valve may be a multi-position solenoid valve, and the number of positions of the fifth valve is determined according to the number of the second detection channels 200, and the specific number of positions is not limited here.

[0077] In some embodiments, a group of first detection channels 200 connected to the fourth valve and a group of second detection channels 200 connected to the fifth valve correspond to different groups of access channels 100 .

[0078] by Figure 4 For example, in the same stage, the control device can control the fourth valve V8 to make the first detection channel 200 corresponding to the battery group 1 in a conducting state, and then the vacuum device 400 vacuums the battery group 1. The control device can control the fifth valve V9 to make the first detection channel 200 corresponding to the battery group 2 in a conducting state, so that the gas detection device 500 performs gas detection on the vacuumed battery group 2.

[0079] In these examples, by providing a plurality of fourth valves and fifth valves, leakage detection of each battery pack can be controlled by the fourth valve and the fifth valve, which can improve the flexibility of battery pack leakage detection.

[0080] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A battery detection device, characterized in that: The battery detection device comprises: At least two access channels, a first end of the access channel is a connection end of the battery pack, and one access channel corresponds to one battery pack; At least two first detection channels, one first detection channel corresponds to one access channel, a first end of the first detection channel is a connection end connected to a gas extraction device, and a second end of the first detection channel is connected to a second end of the corresponding access channel; at least two second detection channels, one second detection channel corresponds to one access channel, a first end of the second detection channel is a connection end connected to a gas detection device, and a second end of the second detection channel is connected to a second end of the corresponding access channel; and A control device, wherein the control device is configured to: in a first stage, control the first detection channel and the second detection channel corresponding to the first group of access channels to be in an on state and a closed state respectively, so as to evacuate the first group of battery packs connected to the first group of access channels, and control the first detection channel and the second detection channel corresponding to the second group of access channels to be in a closed state and a on state respectively, so as to perform gas detection on the second group of battery packs connected to the second group of access channels; wherein the first group of access channels and the second group of access channels respectively include at least one access channel, and the first group of access channels and the second group of access channels include different access channels.

2. The battery detection device according to claim 1, characterized in that: The control device is also configured to: in a second stage after the first stage, control the first detection channel and the second detection channel corresponding to the first group of access channels to be in a closed state and a conductive state respectively, so as to perform gas detection on the first group of battery packs, and control the first detection channel and the second detection channel corresponding to the third group of access channels to be in a conductive state and a closed state respectively, so as to degas the third group of battery packs connected to the third group of access channels; wherein the third group of access channels includes at least one access channel, and the first group of access channels, the second group of access channels and the third group of access channels include different access channels.

3. The battery detection device according to claim 2, characterized in that: The battery detection device also includes an air pressure detection device for detecting the air pressure inside the battery pack, and the air pressure detection device is connected to the control device; The control device is also configured to: in the first stage, obtain the internal air pressure value of the first battery pack detected by the air pressure detection device, and when the internal air pressure value is less than or equal to a set threshold, end the first stage and start the second stage.

4. The battery detection device according to claim 3, characterized in that: The control device is also configured to: if the internal air pressure value is still greater than the set threshold value when the first stage reaches a set time, end the first stage and cancel the second stage.

5. The battery detection device according to claim 3, characterized in that: When the first battery group connected to the first access channel is replaced with a fourth battery group, the control device is configured to: in the final stage, control the first detection channel and the second detection channel corresponding to the last access channel to be in a closed state and a conductive state, respectively, to perform gas detection on the first battery group, and control the first detection channel and the second detection channel corresponding to the first access channel to be in a conductive state and a closed state, respectively, to evacuate the fourth battery group connected to the first access channel.

6. The battery testing device according to any one of claims 1 to 5, characterized in that: The first detection channel is provided with a first valve, and the second detection channel is provided with a second valve; The control device is configured to: control the first valve so that the first detection channel is in a closed state or an open state, and control the second valve so that the second detection channel is in a closed state or an open state.

7. The battery detection device according to claim 6, characterized in that: Each group of access channels is an access channel, and each access channel corresponds to a first detection channel and a second detection channel.

8. The battery testing device according to any one of claims 1 to 5, characterized in that: The first detection channel and the second detection channel corresponding to the access channel are provided with a common third valve, and the control device changes the state of the first detection channel and the second detection channel by controlling the third valve, wherein: When the third valve is in a first state, the first detection channel is in an open state, and the second detection channel is in a closed state; When the third valve is in a second state, the first detection channel is in a closed state, and the second detection channel is in a conducting state; When the third valve is in a third state, the first detection channel is in a closed state, and the second detection channel is in a closed state.

9. The battery detection device according to claim 8, characterized in that: The control device is configured to control at most one third valve in the first state and at most one third valve in the second state in the same phase.

10. The battery testing device according to any one of claims 1 to 5, characterized in that: Each of the first detection channels is provided with a common fourth valve, each of the second detection channels is provided with a common fifth valve, the control device changes the state of the first detection channel by controlling the fourth valve, and changes the state of the second detection channel by controlling the fifth valve, wherein: When the fourth valve is in the first state, the first detection channel corresponding to one group of access channels is turned on, and the first detection channels corresponding to the other groups of access channels are turned off; when the fourth valve is in the second state, the first detection channels corresponding to the respective groups of access channels are turned off; When the fifth valve is in the first state, the second detection channel corresponding to one group of access channels is turned on, and the second detection channels corresponding to the remaining groups of access channels are turned on and closed; when the fifth valve is in the second state, the second detection channels corresponding to each group of access channels are turned on and closed.

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