Battery detection device

Abstract

This disclosure relates to a battery testing device, comprising: at least two access channels, each access channel corresponding to one battery pack; at least two first detection channels, each first detection channel corresponding to one access channel, with the second end of each first detection channel connected to the second end of the corresponding access channel; at least two second detection channels, each second detection channel corresponding to one access channel, the first end of each second detection channel serving as a connection end for a gas detection device, and the second end of each second detection channel connected to the second end of the corresponding access channel; and a control device configured to: in a first stage, control the first and second detection channels corresponding to the first set of access channels to be in an on state and a closed state, respectively, and control the first and second detection channels corresponding to the second set of access channels to be in a closed state and an on state, respectively. This invention can improve the efficiency of battery pack testing.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure relate to the technical field of battery detection, and more particularly, to a battery detection device. BACKGROUND

[0002] As a commonly used power source, the safety of a battery is widely concerned by consumers. At present, if liquid leakage occurs in a battery pack, safety problems such as sampling abnormality of the battery pack, EV restriction or self-ignition may occur.

[0003] In the prior art, to detect liquid leakage of a battery pack, a vacuum pump is usually used to form a negative pressure in the battery pack, and then a mass spectrometer is used to detect the gas in the battery pack to confirm whether liquid leakage occurs in the battery pack. However, when the number of battery packs is large, detecting the battery packs one by one will result in a long detection time. SUMMARY

[0004] An object of embodiments of the present disclosure is to provide a new technical solution of a battery detection device.

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

[0006] at least two access channels, a first end of the access channel being a connection end of a battery pack, one access channel corresponding to one battery pack;

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

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

[0009] a control device, configured to, in a first stage, control the first detection channel and the second detection channel corresponding to a first group of access channels to be in a conduction state and a closed state respectively, to extract gas from a 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 a second group of access channels to be in a closed state and a conduction state respectively, to detect gas from a 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 each 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, 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 conducting state and a closed state respectively, so as to perform gas extraction on the third group of battery packs connected to the third group of access channels; wherein the third group of access channels comprises 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 comprise different access channels.

[0011] Optionally, the battery detection device further comprises a gas pressure detection device for detecting the internal gas pressure of the battery pack, and the gas pressure detection device is connected to the control device.

[0012] The control device is further configured to, in the first stage, acquire the internal gas pressure value of the first group of battery packs detected by the gas pressure detection device, and end the first stage and start the second stage if the internal gas pressure value is less than or equal to a set threshold value.

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

[0014] Optionally, in the case that the first group of battery packs connected to the first group of access channels are replaced by a fourth group of battery packs, the control device is configured to, in a final stage, control the first detection channel and the second detection channel corresponding to the last group of access channels to be in a closed state and a conducting 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 first group of access channels to be in a conducting state and a closed state respectively, so as to perform gas extraction on the fourth group of battery packs connected to the first group of access channels.

[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 to make the first detection channel be in a closed state or a conducting state, and control the second valve to make the second detection channel be in a closed state or a conducting state.

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

[0018] Optionally, the first detection channel and the second detection channel corresponding to the access channel are provided with a shared 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:

[0019] In the first state, the first detection channel of the third valve is in a conducting state, and the second detection channel is in a closed state.

[0020] In the second state, the first detection channel of the third valve is closed and the second detection channel is open.

[0021] In the third state, the first detection channel is closed and the second detection channel is closed.

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

[0023] Optionally, each of the first detection channels is provided with a shared fourth valve, and each of the second detection channels is provided with a shared 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:

[0024] In the first state, the fourth valve is activated in one group of access channels and closed in the first detection channel corresponding to the remaining access channels; in the second state, the fourth valve is closed in the first detection channel corresponding to each group of access channels.

[0025] In the first state, the second detection channel corresponding to one group of access channels is turned on, while the second detection channel corresponding to the remaining groups of access channels is turned off. In the second state, the second detection channel corresponding to each group of access channels is turned off.

[0026] Optionally, the first set of detection channels for the fourth valve to be turned on and the second set of detection channels for the fifth valve to be turned on are different sets of access channels.

[0027] One beneficial effect of this embodiment is that each battery pack can be connected to an access channel, and the control device can control the first detection channel corresponding to one set of access channels to evacuate one set of battery packs. At the same time, it can control the second detection channel corresponding to another set of access channels to perform gas detection on another set of battery packs that has been evacuated, thereby shortening the detection time and effectively improving the detection efficiency for battery leakage.

[0028] Other features and advantages of the embodiments of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

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

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

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

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

[0033] Figure 4 This is a schematic diagram of a battery detection device according to another embodiment. Detailed Implementation

[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, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

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

[0036] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

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

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

[0039] The following section will first combine the appendix. Figures 1 to 4 A detailed description of the battery detection device according to an embodiment of this application.

[0040] This invention provides a battery testing device, such as... Figure 1As shown, the battery testing device includes: at least two access channels 100, the first end of each access channel 100 being a connection end to a battery pack, with one access channel 100 corresponding to one battery pack; at least two first detection channels 200, each first detection channel 200 corresponding to one access channel 100, the first end of each first detection channel 200 being a connection end to a vacuum device 400, and the second end of each first detection channel 200 being connected to the second end of its corresponding access channel 100; and at least two second detection channels 300, each second detection channel 300 corresponding to one access channel 100, the first end of each second detection channel 300 being a connection end to a gas detection device 500, and the second end of each second detection channel 300 being connected to the second end of its corresponding access channel 100. Two-terminal connection; and a control device, the control device being configured to: in a first stage, control the first detection channel 200 and the second detection channel 300 corresponding to the first group of access channels 100 to be in a conducting 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 300 corresponding to the second group of access channels 100 to be in a closed state and a conducting 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 each 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] Specifically, the first detection channel 200 is in an on state when it is connected to the corresponding access channel 100, and in a closed state when it is not connected to the corresponding access channel 100. Similarly, the second detection channel 300 is in an on state when it is connected to the corresponding access channel 100, and in a closed state when it is not connected to the corresponding access channel 100.

[0042] In some examples, access channel 100 is a channel connected to the battery pack. This channel can be a pipe, and the shape of the pipe's cross-section can be square, circular, etc., without limitation. Each set of access channels 100 can be one access channel 100 or multiple access channels 100, without limitation. Each access channel 100 is used to connect to one battery pack, that is, each battery pack can be connected to a corresponding set of access channels 100.

[0043] In some examples, the first detection channel 200 is a channel connected to the vacuum device 400. This channel can be a pipe, and the cross-sectional shape of the pipe can be square, circular, etc., without limitation. The first detection channel 200 can be connected to the access channel 100, so that the vacuum device 400 can evacuate air from inside the battery pack through the first detection channel 200 and the access channel 100. The vacuum device 400 can be a vacuum pump.

[0044] In some examples, the second detection channel 300 is a channel connected to the gas detection device 500. This channel can be a pipe, and the shape of the pipe's cross-section can be square, circular, etc., without limitation. The second detection channel 300 can be connected to the access channel 100, allowing the gas detection device 500 to perform gas detection inside the evacuated battery pack through the second detection channel 300 and the access channel 100. 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 a conducting or closed state. For instance, the control device is a control chip that can output a corresponding control signal to cause the solenoid valve of the detection channel to act in response to the control signal, thereby opening or closing the detection channel. As another example, the control device is a clamping device, and the detection channel is a flexible pipe. The control device can close the first detection channel 200 by clamping it, and after the control device is reset, the first detection channel 200 can be opened again by its own elasticity.

[0046] In some examples, each battery pack can first be evacuated by the evacuation device 400 before the gas detection device 500 detects whether there is any leakage inside the battery pack. That is, in a stage before the first stage, the control device can control the first detection channel 200 corresponding to the second battery pack to perform evacuation. In the first stage, the control device can perform gas detection on the second battery pack.

[0047] by Figure 1 For example, battery pack 1 and battery pack 2 constitute the first battery pack, and battery pack 3 and battery pack 4 constitute 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 a conductive state, and the second detection channel 300 corresponding to battery pack 1 and battery pack 2 to be in a closed state, so as to evacuate air from battery pack 1 and battery pack 2. At the same time, the control device controls the second detection channel 300 corresponding to battery pack 3 and battery pack 4 to be in a conductive state, and the first detection channel 200 corresponding to battery pack 3 and battery pack 4 to be in a closed state, so as to perform gas detection on battery pack 3 and battery pack 4 that have already been evacuated.

[0048] In these examples, each battery pack can be connected to the access channel 100. The control device can control the first detection channel 200 corresponding to one set of access channels 100 to evacuate one set of battery packs. At the same time, it can control the second detection channel 300 corresponding to another set of access channels 100 to perform gas detection on another set of battery packs that has been evacuated, thereby shortening the detection time and effectively improving the detection efficiency for battery leakage.

[0049] In some embodiments, the control device is further configured to: in a second stage following the first stage, control the first detection channel 200 and the second detection channel 300 corresponding to the first group of access channels 100 to be in a closed state and an open state respectively, so as to perform gas detection on the first group of battery packs; and control the first detection channel 200 and the second detection channel 300 corresponding to the third group of access channels 100 to be in an open state and a closed state respectively, so as to evacuate 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 third battery pack. In the second stage following the first stage, the control device controls the first detection channel 200 corresponding to battery pack 1 to be closed and the second detection channel 300 corresponding to battery pack 1 to be open, 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 open and the second detection channel 300 corresponding to battery pack 3 to be closed, so as to evacuate gas from battery pack 3.

[0051] In these examples, the control device controls one group of battery packs to extract gas and another group to detect gas at different stages, realizing cyclic control to detect leakage in each battery pack, thus achieving intelligent leakage detection.

[0052] In some embodiments, the battery testing device further includes a pressure detection device 600 for detecting the internal air pressure of the battery pack, the pressure detection device 600 being connected to a control device; the control device is further configured to: in a first stage, acquire the internal air pressure value of the first battery pack detected by the pressure detection device 600, and if the internal air pressure value is less than or equal to a set threshold, end the first stage and begin the second stage.

[0053] In some examples, with Figure 2 As shown, the pressure detection device 600 can be a vacuum gauge and is located at the interface of the pressure detection device 600 to detect the pressure value of a battery pack that is being pumped out.

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

[0055] In these examples, by setting up a gas pressure detection device 600, it can be determined 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: end the first stage and cancel the second stage if the internal air pressure value is still greater than a set threshold when the first stage reaches a set time.

[0057] In some examples, the duration can be set to 5 seconds, 20 seconds, or 1 minute, etc., and there is no limitation here.

[0058] In some examples, the battery testing device can be configured with a corresponding voice broadcasting device or display device, so that if the internal air pressure value of a battery pack is still greater than a set threshold after a set time, a warning message indicating that the battery pack is damaged can be displayed to the testing personnel through the voice broadcasting device or display device.

[0059] In these examples, by setting up a gas pressure detection device 600, it is possible to quickly determine whether a battery pack is leaking gas, reducing the need for further gas detection of the battery pack and improving detection efficiency.

[0060] In some embodiments, when the first battery pack connected to the first access channel 100 is replaced with the fourth battery pack, the control device is configured to: in the final stage, control the first detection channel 200 and the second detection channel 300 corresponding to the last access channel 100 to be in a closed state and an open state respectively, so as to perform gas detection on the first battery pack, and control the first detection channel 200 and the second detection channel 300 corresponding to the first access channel 100 to be in an open state and a closed state respectively, so as to extract gas from the fourth battery pack connected to the first access channel 100.

[0061] by Figure 1For example, the first battery pack is battery pack 1, the second is battery pack 2, the third is battery pack 3, the last is battery pack 4, and the fourth is battery pack 5. The control device sequentially evacuates gas from battery packs 1 through 4 and then performs gas detection. During this process, the tested battery pack 1 can be replaced with battery pack 5. The control device keeps the first detection channel 200 corresponding to battery pack 4 closed and the second detection channel 300 corresponding to battery pack 4 open to perform gas detection on battery pack 4. Simultaneously, after the control device determines through a sensor installed in the access channel 100 that battery pack 4 has successfully connected to the access channel 100, it keeps the first detection channel 200 corresponding to battery pack 5 open and the second detection channel 300 corresponding to battery pack 5 closed to evacuate gas from battery pack 5. The sensor can be an infrared sensor or a pressure sensor, etc., and is not limited here.

[0062] In other words, after completing one round of control cycle to detect leakage in each battery pack, the control device can replace the detected battery pack with the battery pack to be tested and start the next round of control cycle, thus further realizing intelligent leakage detection.

[0063] In some embodiments, the first detection channel 200 is provided with a first valve, and the second detection channel 300 is provided with a second valve; the control device is configured to: control the first valve to make the first detection channel 200 closed or open, and control the second valve to make the second detection channel 300 closed or open.

[0064] In some examples, both the first valve and the second valve are two-position solenoid valves. The first valve and the second valve can operate under the control of the control device, so that the first detection channel 200 or the second detection channel 300 is in a conducting state or a closed state.

[0065] In other words, by setting 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 300.

[0067] by Figure 2For example, valves V1, V3, V5, V2, V4, and V6 are all normally closed valves. In stage 1, the control device can open valve V1, causing the evacuation device 400 to evacuate gas from battery pack 1. In stage 2, the control device can open valve V2, causing the gas detection device 500 to detect gas in battery pack 1, and then the control device can open valve V3, causing the evacuation device 400 to evacuate gas from battery pack 2. In stage 3, the control device can open valve V4, causing the gas detection device 500 to detect gas in battery pack 2, and then the control device can open valve V5, causing the evacuation device 400 to evacuate gas from battery pack 3. In stage 4, the control device can open valve V6, causing the gas detection device 500 to detect gas in battery pack 3.

[0068] In some embodiments, the first detection channel 200 and the second detection channel 300 corresponding to the access channel 100 are provided with a shared third valve. The control device changes the state of the first detection channel 200 and the second detection channel 300 by controlling the third valve, wherein: in the first state, the first detection channel 200 is in a conducting state and the second detection channel 300 is in a closed state; in the second state, the first detection channel 200 is in a closed state and the second detection channel 300 is in a conducting state; in the third state, the first detection channel 200 is in a closed state and the second detection channel 300 is in a closed state.

[0069] In some examples, the third valve can be a three-position solenoid valve, such that in the first detection channel 200 and the second detection channel 300, one is in the on state and the other is in the closed state, or both are in the closed state.

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

[0071] by Figure 4 For example, in the same stage, the control device can control the third valve V7 corresponding to battery pack 2 in the first state, so that the evacuation device 400 evacuates the battery pack 2. The control device can control the third valve V7 corresponding to battery pack 1 in the second state, so that the gas detection device 500 detects the gas in the evacuated battery pack 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 in the first state, so that the evacuation device 400 evacuates 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 can perform gas detection on the battery pack 4 that has been evacuated.

[0074] In these examples, by setting up multiple third valves, leakage detection for each battery pack can be controlled by the same third valve, which improves the flexibility of battery pack leakage detection.

[0075] In some embodiments, each first detection channel 200 is provided with a shared fourth valve, and each second detection channel 300 is provided with a shared 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 300 by controlling the fifth valve. In the first state, the fourth valve is closed for the first detection channel 200 corresponding to one group of access channels 100; in the second state, the fourth valve is closed for the first detection channel 200 corresponding to each group of access channels 100. In the first state, the fifth valve is closed for the second detection channel 300 corresponding to one group of access channels 100; in the second state, the fifth valve is closed for the second detection channel 300 corresponding to each group of access channels 100.

[0076] In some examples, the fourth valve can 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; the specific number of positions is not limited here. The fifth valve can 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 300; the specific number of positions is not limited here.

[0077] In some embodiments, the first detection channel 200 for the fourth valve being turned on and the second detection channel 300 for the fifth valve being turned on are different sets 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 pack 1 in the conducting state, and then the evacuation device 400 evacuates the battery pack 1. The control device can control the fifth valve V9 to make the first detection channel 200 corresponding to the battery pack 2 in the conducting state, so that the gas detection device 500 performs gas detection on the evacuated battery pack 2.

[0079] In these examples, by setting multiple fourth and fifth valves, leakage detection for each battery pack can be controlled through the fourth and fifth valves, which can improve the flexibility of battery pack leakage detection.

[0080] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A battery testing device, characterized in that, The battery testing device includes: At least two access channels, the first end of which is the 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, the first end of the first detection channel is the connection end for connecting the air extraction device, and the second end of the first detection channel is connected to the second end of the corresponding access channel; At least two second detection channels, each corresponding to one access channel; the first end of each second detection channel is a connection terminal for connecting to a gas detection device, and the second end of each second detection channel is connected to the second end of its corresponding access channel; and A 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, 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 an on state, respectively, 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 each include at least one access channel, and the first group of access channels and the second group of access channels include different access channels; 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 an on 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 an on state and a closed state, respectively, to evacuate 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.

2. The battery testing device according to claim 1, characterized in that, The battery testing device also includes a pressure testing device for detecting the internal air pressure of the battery pack, and the pressure testing device is connected to the control device. The control device is further configured to: in the first stage, acquire the internal air pressure value of the first battery pack detected by the air pressure detection device; and if the internal air pressure value is less than or equal to a set threshold, end the first stage and start the second stage.

3. The battery testing device according to claim 2, characterized in that, The control device is also configured to: if the internal air pressure value is still greater than the set threshold when the first stage reaches the set time, end the first stage and cancel the second stage.

4. The battery testing device according to claim 2, characterized in that, When the first battery pack connected to the first access channel is replaced with the fourth battery pack, 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 an open state respectively, so as to perform gas detection on the first battery pack, and control the first detection channel and the second detection channel corresponding to the first access channel to be in an open state and a closed state respectively, so as to extract gas from the fourth battery pack connected to the first access channel.

5. The battery testing device according to any one of claims 1 to 4, characterized in that, The first detection channel is equipped with a first valve, and the second detection channel is equipped with a second valve; The control device is configured to: control the first valve to make the first detection channel closed or open, and control the second valve to make the second detection channel closed or open.

6. The battery testing device according to claim 5, 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.

7. The battery testing device according to any one of claims 1 to 4, characterized in that, The first and second detection channels corresponding to the access channel are equipped with a shared third valve. The control device changes the state of the first and second detection channels by controlling the third valve, wherein: In the first state, the first detection channel of the third valve is in a conducting state, and the second detection channel is in a closed state. In the second state, the first detection channel of the third valve is closed and the second detection channel is open. In the third state, the first detection channel is closed and the second detection channel is closed.

8. The battery testing device according to claim 7, 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 at the same stage.

9. The battery testing device according to any one of claims 1 to 4, characterized in that, Each of the first detection channels is provided with a shared fourth valve, and each of the second detection channels is provided with a shared 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: In the first state, the fourth valve is activated in one group of access channels and closed in the first detection channel corresponding to the remaining access channels; in the second state, the fourth valve is closed in the first detection channel corresponding to each group of access channels. In the first state, the second detection channel corresponding to one group of access channels is turned on, while the second detection channel corresponding to the remaining groups of access channels is turned off. In the second state, the second detection channel corresponding to each group of access channels is turned off.

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