Battery cell

Abstract

This invention provides a battery cell comprising a battery module formed by stacking a plurality of electrode sheets along a first direction; and a cooling plate overlapping the surface of the battery module. The electrode sheets have: a coated portion having an active material on at least one surface; and an uncoated portion adjacent to the coated portion and having no active material on either surface. The cooling plate has: a main plate opposite the coated portion and cooling the battery module; and at least one sensor holder mounted along the outer edge of the main plate and holding a sensor for detecting information related to the battery module. In the battery cell, when viewed along the first direction, the boundary between the coated and uncoated portions of the electrode sheets does not overlap with the boundary between the main plate and the sensor holder on the contact surface of the cooling plate in a region extending parallel to each other.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a battery cell having a battery module and a cooling plate overlapping on the surface of the battery module, wherein the battery module is formed by stacking multiple electrode sheets. Background Technology

[0002] An example of a battery cell (e.g., an all-solid-state battery) having the above structure is disclosed in Japanese Patent Application Publication No. 2015-53261. Active material is locally present on at least one surface of the electrode sheet (e.g., an aluminum laminate) of the battery module. Summary of the Invention

[0003] In a battery module composed of multiple stacked electrode sheets, the areas of the electrode sheets containing active material are less prone to deformation than the areas without active material. Therefore, stress tends to concentrate at the interface between these two areas. Additionally, the cooling plate abuts against the surface of the battery module. Sometimes, a sensor bracket is mounted on the outer edge of the main plate of the cooling plate used to cool the battery module; this sensor bracket holds a sensor that detects information related to the battery module. In this case, an interface between the main plate and the sensor bracket is formed on the surface of the cooling plate that abuts against the battery module. At this interface, a step may sometimes form due to factors such as manufacturing errors. If this step at the interface between the main plate and the sensor bracket abuts against the surface of the battery module, the electrode sheets on the surface are particularly susceptible to damage at the interface between the areas of the battery module containing active material and those without, where stress is likely to occur.

[0004] This specification provides a technique for reducing damage to the electrode plates in a battery cell having the above-described structure.

[0005] The battery cell disclosed in this specification comprises: a battery module formed by stacking a plurality of electrode sheets along a first direction; and a cooling plate overlapping and disposed on the surface of the battery module. The electrode sheets have: a coated portion having an active material on at least one surface; and an uncoated portion adjacent to the coated portion and having two sides without the active material. The cooling plate has: a main plate opposite the coated portion and configured to cool the battery module; and at least one sensor holder mounted along the outer edge of the main plate and configured to hold a sensor that detects information related to the battery module. The contact surface of the cooling plate that abuts against the battery module includes the junction of the main plate and the sensor holder. In the battery cell disclosed in this specification, when viewed along the first direction, the boundary between the coated portion and the uncoated portion in the electrode sheet and the boundary between the main body plate and the sensor bracket in the contact surface of the cooling plate do not overlap in the following intervals, which are intervals in which the boundary between the coated portion and the uncoated portion and the boundary between the main body plate and the sensor bracket extend parallel to each other.

[0006] In the aforementioned battery cell, the boundary between the coated and uncoated portions, which are prone to stress, does not overlap with the boundary between the main body plate and the sensor support, which are prone to steps, in a parallel extending region. In other words, the boundary between the coated and uncoated portions and the boundary between the main body plate and the sensor support are offset in a parallel extending region. As a result, even if a step is formed at the boundary between the main body plate and the sensor support, the step is unlikely to come into contact with the boundary between the coated and uncoated portions. Therefore, the stress applied to the battery cell is dispersed into stress generated by the corner of the step coming into contact with the surface of the battery module and stress generated at the boundary between the coated and uncoated portions. As a result, the battery cell disclosed in this specification can reduce damage to the electrode plates.

[0007] Details of the technology disclosed in this specification and further improvements will be described in the following "Detailed Description". Attached Figure Description

[0008] The features, advantages, technical significance, and industrial significance of exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals denote the same elements, wherein:

[0009] Figure 1 This is a perspective view of the battery cell in the embodiment;

[0010] Figure 2 This is an exploded view of the battery cell in an embodiment;

[0011] Figure 3 It is along Figure 2Sectional view of line III-III;

[0012] Figure 4 yes Figure 3 An enlarged view of the area enclosed by the dashed line IV. Detailed Implementation

[0013] In one embodiment of this technology, when viewed along the first direction, at least a portion of the junction between the main body plate and the sensor support in the contact surface may be located on the coated portion of the electrode sheet. When configured this way, the sensor support overlaps with the coated portion. As a result, the sensor's detection accuracy can be improved because the sensor held by the sensor support is close to the coated portion.

[0014] In one embodiment of this technology, the sensor bracket may have a first sensor bracket and a second sensor bracket. The first sensor bracket is mounted along a first outer edge of the main body plate, and the second sensor bracket is mounted along a second outer edge of the main body plate located opposite the first outer edge. When configured this way, multiple sensors can be held on both sides of the main body plate. As a result, the flexibility in sensor configuration is increased.

[0015] In one embodiment of this technology, a first sensor can be held on the first sensor bracket, and the first sensor detects first information related to the battery module. Alternatively, a second sensor can be held on the second sensor bracket, and the second sensor detects second information related to the battery module but different from the first information. When configured in this way, multiple pieces of information related to the battery module can be detected.

[0016] In one embodiment of this technology, the first sensor can also be a temperature sensor that detects the temperature of the electrode sheet. When configured in this way, the temperature sensor can be used to detect information related to the temperature of the battery module.

[0017] - In one embodiment of this technology, the second sensor may also be a voltage sensor that detects the voltage of the electrode sheet. When configured in this way, the voltage sensor can be used to detect information related to the voltage of the battery module.

[0018] In one embodiment of this technology, the main body plate may be made of metal and the sensor holder may be made of resin. In this case, the resin sensor holder is more prone to deformation than the cooling portion of the metal main body plate. As a result, the unpainted portion opposite the resin sensor holder is also prone to deformation. Therefore, the technology disclosed in this specification becomes more advantageous.

[0019] In one embodiment of this technology, the battery cell may also include multiple battery modules and multiple cooling plates, and the multiple battery modules and multiple cooling plates may be alternately arranged along the first direction. The uncoated portions of multilayered electrode sheets are more prone to deformation than the uncoated portions of a single layer. Therefore, the technology disclosed in this specification becomes more advantageous.

[0020] In one embodiment of this technology, at least one of the plurality of cooling plates may have the main body plate and a partition plate, the partition plate being the same shape as the sensor bracket and mounted along the outer edge of the main body plate. When configured in this way, the cooling plate can replace the sensor bracket by having a partition plate. Therefore, compared to a structure where all cooling plates have sensor brackets, the number of sensors can be reduced.

[0021] In one embodiment of this technology, the battery cell may also include a pressing unit configured to press the battery module and the cooling plate in the first direction. When the battery module and the cooling plate are pressed using the pressing unit, the stress applied to the electrode plates on the surface of the battery module increases. Therefore, the technology disclosed in this specification becomes more advantageous.

[0022] Example

[0023] The battery cell of an embodiment will be described with reference to the accompanying drawings. First, refer to... Figure 1 and Figure 2 The structure of the battery cell 10 in this embodiment will be explained. The battery cell 10 is, for example, a lithium-ion secondary battery. The battery cell 10 includes a battery module assembly 50 and a pressing unit 2. The battery module assembly 50 is constructed by stacking multiple flat battery modules 20 along their thickness direction. On the positive side of the battery module assembly 50 in the X-axis direction (i.e., Figure 1 The battery module 10 has a first terminal 9u and a second terminal 9d on the left side of the paper. Each terminal 9u and 9d is electrically connected to a peripheral device (not shown) of the battery unit 10. Thus, the battery unit 10 supplies power to the peripheral device or stores electrical energy supplied from the peripheral device. It should be noted that, hereinafter, the direction in which the battery module 20 is stacked (i.e., the Z-axis direction of the coordinate axis in the figure) is sometimes referred to as the first direction.

[0024] The pressing unit 2 is a device for holding the battery module assembly 50. The pressing unit 2 includes a first pressing plate 2u, a second pressing plate 2d, and eight bolts 4. Eight posts 2p extending toward the first pressing plate 2u are provided on the second pressing plate 2d. Figure 2 As shown, each bolt 4 is screwed into a threaded hole provided on the corresponding post 2p through a through hole in the first pressing plate 2u. Thus, the pressing unit 2 holds the battery module assembly 50 inside and presses the battery module assembly 50 in a first direction.

[0025] like Figure 2 As shown, the battery module assembly 50 is constructed by alternately stacking multiple battery modules 20 and multiple cooling plates 30 along a first direction. Each battery module 20 has a flat shape extending along the X-axis. Each battery module 20 includes a painted portion 24 and an unpainted portion 22. The painted portion 24 has a rectangular shape extending along the X-axis and is located at the center of the battery module 20. For detailed structure of the battery module 20, please refer to... Figure 3 , Figure 4 To be described later. Coating section 24 is for applying active substance 44 (see reference). Figure 4 The uncoated portion 22 is located around the coated portion 24. The uncoated portion 22 is the area where no active material is applied. Each battery module 20 has the same structure.

[0026] The cooling plate 30, like the battery module 20, has a flat shape extending along the X-axis. The cooling plate 30 includes a main body plate 34, a first sensor bracket 32t, and a second sensor bracket 32v. The main body plate 34 is a metal plate with flow paths 36 formed inside it (see reference). Figure 4 The main body plate 34 cools the battery module 20 by circulating refrigerant (e.g., air) in an internal flow path. Each cooling plate 30 has the same structure.

[0027] The first sensor bracket 32t is on the negative side along the X-axis direction of the main body plate 34 (i.e., Figure 2 A resin plate is mounted on the outer edge of the right side of the paper. A temperature sensor T1 is fixed on the first sensor bracket 32t. The temperature sensor T1 is mounted on the surface of the first sensor bracket 32t (i.e., the right side of the paper). Figure 2 The upper side of the paper surface is exposed. Temperature sensor T1 detects the temperature of the battery module 20 disposed on the surface of the first sensor bracket 32t. In addition, temperature sensor T1 is embedded in a recess formed in the surface of the first sensor bracket 32t. As a result, since temperature sensor T1 does not protrude from the surface of the first sensor bracket 32t, the length of the battery module group 50 in the first direction can be shortened even if multiple cooling plates 30 are stacked along the first direction.

[0028] The second sensor bracket 32v is located on the side of the main body plate 34 opposite to the first sensor bracket 32t. The second sensor bracket 32v is on the positive side along the X-axis direction of the main body plate 34 (i.e., Figure 2 A resin plate is mounted on the outer edge of the paper (left side). A voltage sensor V1 is fixed on a second sensor bracket 32v. The outer edge of the body plate 34 side of the voltage sensor V1 abuts against the body plate 34. As previously described, the body plate 34 is made of metal and therefore conductive. The voltage sensor V1 detects the voltage of the battery module 20 via the body plate 34.

[0029] A first current collector plate 8u and a first insulating plate 6u are disposed between the battery module group 50 and the first pressing plate 2u. Similarly, a second current collector plate 8d and a second insulating plate 6d are disposed between the battery module group 50 and the second pressing plate 2d. A first terminal 9u is connected to the first current collector plate 8u. A second terminal 9d is connected to the second current collector plate 8d. Each current collector plate 8u and 8d collects the electrical current generated by the battery module group 50 and outputs the electrical current to the peripheral devices of the battery unit 10 via each terminal 9u and 9d. Each insulating plate 6u and 6d prevents short circuits between the battery module group 50 and each current collector plate 8u and 8d and their peripheral devices.

[0030] Reference Figure 3 This will explain the internal structure of the battery cell 10. It should be noted that... Figure 3 In the middle, only the battery module group 50 located on the positive side in the Z-axis direction (i.e., Figure 3 The battery module 20 and cooling plate 30 (on the upper side of the paper) are marked with reference numerals, and other reference numerals are omitted.

[0031] As previously described, pressing unit 2 utilizes bolt 4 (see reference) Figure 1 Press the first pressing plate 2u against the second pressing plate 2d. The result is as follows: Figure 3 As shown, the battery module group 50 is in the first direction (i.e., Figure 3 The battery module 20 is pressed by the pressing unit 2 in the vertical direction (up and down on the paper). As a result, each cooling plate 30 is always pressed against each battery module 20. Thus, the electricity generated in the battery module 20 is transmitted to the battery module 20 overlapping with the cooling plate 30 via the main body plate 34 of the overlapping cooling plate 30. In this way, the battery modules 20 are connected in series via the main body plate 34 of the overlapping cooling plates 30.

[0032] Manufacturing errors may occur in the thickness of each battery module 20 and each cooling plate 30 in the battery module assembly 50. Therefore, the strength of the force exerted by the pressing pressure F1 on each cooling plate 30 against each battery module 20 may also vary. For example, if an error occurs in the direction where the thickness of each battery module 20 and each cooling plate 30 increases, the strength of the force exerted by the cooling plate 30 against each battery module 20 will increase. On the other hand, if an error occurs in the direction where the thickness of each battery module 20 and each cooling plate 30 decreases, the strength of the force exerted by the cooling plate 30 against each battery module 20 will decrease. Thus, it is difficult to fix the force applied to the battery module assembly 50 in the first direction, and therefore, a larger-than-expected force may be generated at the point where the cooling plate 30 abuts against the battery module 20.

[0033] Reference Figure 4This section details the contact area between the cooling plate 30 and the battery module 20. It should be noted that... Figure 4 The structure of the outer periphery of the negative X-axis side of the cooling plate 30 (i.e., the side where the first sensor bracket 32t is mounted) has been described, but the same applies to the positive X-axis side (i.e., the side where the second sensor bracket 32v is mounted). Furthermore, all portions of the cooling plate 30 that abut against each battery module 20 have the same structure.

[0034] First, the detailed structure of the cooling plate 30 will be described. Multiple flow paths 36 are formed inside the main body plate 34 of the cooling plate 30. On the negative side of the main body plate 34 in the X-axis direction (i.e., Figure 4 The outer edge of the right side of the paper has a protrusion 38 extending toward the first sensor bracket 32t. A groove is provided on the first sensor bracket 32t that engages with the protrusion 38 of the main body plate 34. By pressing the protrusion 38 of the main body plate 34 into the groove of the first sensor bracket 32t, the first sensor bracket 32t is fixed along the outer periphery of the main body plate 34.

[0035] As a result, a plate-side junction 34e between the main body plate 34 and the first sensor bracket 32t is formed on the contact surface 30d of the cooling plate 30 that abuts against the battery module 20. As previously described, the first sensor bracket 32t is a separate component mounted on the main body plate 34. Therefore, due to reasons such as manufacturing errors, a gap may occur between the first sensor bracket 32t and the main body plate 34 at the plate-side junction 34e. In addition, the resin-made first sensor bracket 32t is more prone to expansion at high temperatures than the metal main body plate 34. Therefore, sometimes a space is provided between the first sensor bracket 32t and the main body plate 34 to prevent interference between the expanded first sensor bracket 32t and the main body plate 34.

[0036] Therefore, a step extending in the first direction is easily formed at the plate-side junction 34e. As previously described, the abutment surface 30d of the cooling plate 30 is at the pressing unit 2 (refer to...) Figure 1 The pressing force F1 (refer to) Figure 3 Under the action of the plate, it is pressed against the battery module 20 along the first direction. Therefore, if a step is generated at the plate-side junction 34e, the corner of the step will be pressed against the surface of the battery module 20.

[0037] Next, the detailed structure of the battery module 20 will be described. The battery module 20 is constructed by stacking multiple electrode plates 40 along a first direction and aligning the multiple electrode plates 40 along the X-axis direction (i.e., Figure 4The ends (in the left-right direction of the paper) are sealed with sealing material 48. Each electrode sheet 40 has an active material 44 and a spacer 46. The electrode sheet 40 is typically a metal foil made of aluminum. The active material 44 and the spacer 46 are sandwiched between the electrode sheets 40. The active material 44 includes a positive electrode active material and a negative electrode active material. The positive electrode active material is a lithium transition metal composite oxide, and the negative electrode active material is a carbon material. The spacer 46 prevents the positive electrode active material of the active material 44 from contacting the negative electrode active material.

[0038] Active material 44 is disposed at the center of the surface of electrode sheet 40. Conversely, active material 44 is not disposed on any surface of electrode sheet 40 at its periphery. Electrolyte 42 is contained at the periphery of electrode sheet 40. Electrolyte 42 is typically an organic solvent. Battery module 20 charges and discharges by moving lithium ions through electrolyte 42 between the positive and negative active materials of active material 44.

[0039] The uncoated portion 22 containing the electrolyte 42 lacks the active material 44. Furthermore, as previously described, the active material 44 is made of a material including metals, and therefore is less prone to deformation compared to the electrolyte 42. Consequently, the uncoated portion 22 is more susceptible to deformation in the first direction compared to the coated portion 24 containing the active material 44. Furthermore, the outer edges of the active material 44 in each electrode sheet 40 are aligned when viewed along the first direction. As a result, the electrode-side boundary 44e, which is the junction between the coated portion 24 and the uncoated portion 22, easily becomes the starting point for deformation of the electrode sheet 40. For example, when the battery module 20 is pressed using the pressure of the pressing unit 2, the uncoated portion 22 begins to deform in the first direction (i.e., from the electrode-side boundary 44e). Figure 4 The deformation occurs (in the direction below the paper). As a result, the end of the outer electrode plate 40e that abuts against the contact surface 30d of the cooling plate 30 deforms in the first direction (i.e., from the electrode side junction 44e as the starting point). Figure 4 The electrode bends (in the direction below the paper). Therefore, at the electrode-side junction 44e, the outer electrode plate 40e is easily damaged.

[0040] In battery cell 10 (reference) Figure 1 )middle, Figure 4 The given cross-section shown is along the Y-axis direction (i.e., Figure 4 The electrode-side junction 44e and the plate-side junction 34e extend parallel to each other along the Y-axis. Furthermore, the electrode-side junction 44e and the plate-side junction 34e extend parallel to each other along the X-axis (i.e., in the direction inwards and outwards of the paper). Figure 4The electrode-side boundary 44e and the plate-side boundary 34e are offset in the left-right direction of the paper. That is, in the section where the electrode-side boundary 44e and the plate-side boundary 34e extend parallel to each other, the electrode-side boundary 44e and the plate-side boundary 34e do not overlap when viewed along the first direction. In other words, in the section where the electrode-side boundary 44e and the plate-side boundary 34e extend parallel to each other, their positions are offset when viewed along the first direction. Therefore, the section where the electrode-side boundary 44e, which is easily damaged, and the plate-side boundary 34e, which is prone to step formation, abuts is reduced. Consequently, the step formed at the plate-side boundary 34e is less likely to damage the outer electrode sheet 40e of the electrode-side boundary 44e. That is, the battery cell 10 can reduce the damage applied to the outer electrode sheet 40e.

[0041] Furthermore, such as Figure 4 As shown, the plate-side junction 34e is located inside the electrode-side junction 44e (i.e., Figure 4 The position is on the left side of the paper. In other words, when viewed along the first direction, the plate side junction 34e is located on the coating section 24. As a result, the temperature sensor T1 (refer to the first sensor bracket) is held by the first sensor bracket. Figure 2 The position of the temperature sensor T1 is close to the coating section 24. As a result, the accuracy of the temperature sensor T1 in detecting the temperature of the electrode plate 40 (i.e., the coating section 24) can be improved.

[0042] Furthermore, as previously described, the first sensor bracket 32t is made of resin, and therefore, compared to the metal main body plate 34, the first sensor bracket 32t is more prone to deformation under the pressing force F1 of the pressing unit 2. If the first sensor bracket 32t deforms, the uncoated portion 22 that abuts against the first sensor bracket 32t will also deform. That is, when the main body plate 34 is metal and the first sensor bracket 32t is made of resin, the uncoated portion 22 is more prone to deformation compared to the case where a metal first sensor bracket 32t is used. Therefore, the technology disclosed in this specification is particularly advantageous when a resin-made first sensor bracket 32t is used.

[0043] The embodiments have been described in detail above, but these are merely illustrative and do not limit the scope of the claims. The technology described in the claims includes solutions obtained by various modifications and alterations to the specific examples described above. Below are examples of modifications to the above embodiments.

[0044] Variation Example 1

[0045] In the above embodiment, when viewed along the first direction, the plate side junction 34e is located on the painted portion 24. In Modification 1, the plate side junction 34e can be located on the unpainted portion 22 instead.

[0046] Variation Example 2

[0047] In the above embodiment, the cooling plate 30 has a first sensor bracket 32t and a second sensor bracket 32v, but it is also possible to replace this and have the cooling plate 30 of the modified example 2 only have the first sensor bracket 32t. In this case, the temperature sensor T1 and the voltage sensor V1 can be held by the first sensor bracket 32t.

[0048] Variation Example 3

[0049] In the above embodiments, the cooling plate 30 includes both a temperature sensor T1 and a voltage sensor V1. However, in variation 3, it may only include the voltage sensor V1. That is, it may be a structure that does not include the temperature sensor T1.

[0050] Variation Example 4

[0051] The 32t and 32v sensor brackets can also be made of metal.

[0052] Modified Example 5

[0053] The battery module group 50 may not consist of multiple battery modules 20 stacked along the first direction. That is, in variation 5, the battery unit 10 may have only one battery module 20.

[0054] Variation Example 6

[0055] In the above embodiments, the plurality of cooling plates 30 each have a temperature sensor T1 held by a first sensor bracket 32t and a voltage sensor V1 held by a second sensor bracket 32v. In a variation 6, at least one of the plurality of cooling plates 30 may also have a partition with the same shape as the first sensor bracket 32t. In this case, the partition, for example, replaces the first sensor bracket 32t and is mounted along the outer edge of the main body plate 34. The partition does not hold the temperature sensor T1. Thus, by mounting a partition with the same shape as the first sensor bracket 32t along the outer edge of the main body plate 34, the number of temperature sensors T1 can be reduced. In addition, by mounting a partition with the same shape as the first sensor bracket 32t on the cooling plates 30 that do not have temperature sensors T1, the size of the cooling plates 30 can be made uniform. As a result, the pressing force F1 of the pressing unit 2 is uniformly distributed relative to the plurality of cooling plates 30.

[0056] Variation Example 7

[0057] In the above embodiment, the pressing unit 2 is used to press the battery module assembly 50 in a first direction. In variation 7, the pressing unit 2 may be replaced by, for example, resin to seal the battery module assembly 50.

[0058] The specific examples of the present invention have been described in detail above, but these are merely illustrative and do not limit the scope of the claims. The technology described in the claims includes solutions obtained by various modifications and alterations to the specific examples described above. The technical elements described in this specification or drawings are technical elements that exert their technical usefulness individually or in various combinations, and are not limited to the combinations described in the claims at the time of application. In addition, the technology illustrated in this specification or drawings is capable of achieving multiple objectives simultaneously, and the technology that achieves one of the objectives is itself technically useful.

Claims

1. A battery cell, characterized in that, have: A battery module, wherein the battery module is formed by stacking multiple electrode sheets along a first direction; and Cooling plates, which are stacked on the surface of the battery module, The electrode sheet has: a coated portion having an active material on at least one surface; and an uncoated portion adjacent to the coated portion and having two surfaces without the active material. The cooling plate includes: a main plate opposite to the coating section and configured to cool the battery module; and at least one sensor bracket mounted along the outer edge of the main plate and configured to hold a sensor that detects information related to the battery module. The contact surface of the cooling plate that abuts against the battery module includes the junction of the main body plate and the sensor bracket. When viewed along the first direction, the boundary between the coated portion and the uncoated portion in the electrode sheet and the boundary between the main plate and the sensor bracket in the contact surface of the cooling plate do not overlap in the following intervals, which are intervals in which the boundary between the coated portion and the uncoated portion and the boundary between the main plate and the sensor bracket extend parallel to each other.

2. The battery cell according to claim 1, characterized in that, When viewed along the first direction, at least a portion of the junction between the main body plate and the sensor bracket in the contact surface is located on the coated portion of the electrode sheet.

3. The battery cell according to claim 1 or 2, characterized in that, The sensor bracket has a first sensor bracket and a second sensor bracket. The first sensor bracket is mounted along the outer edge of a first side of the main body plate, and the second sensor bracket is mounted along the outer edge of a second side of the main body plate opposite to the outer edge of the first side.

4. The battery cell according to claim 3, characterized in that, A first sensor is held on the first sensor bracket, and the first sensor detects first information related to the battery module. A second sensor is held on the second sensor bracket, and the second sensor detects second information that is related to the battery module and is different from the first information.

5. The battery cell according to claim 4, characterized in that, The first sensor is a temperature sensor that detects the temperature of the battery module.

6. The battery cell according to claim 4 or 5, characterized in that, The second sensor is a voltage sensor that detects the voltage of the battery module.

7. The battery cell according to claim 1 or 2, characterized in that, The main body plate is made of metal. The sensor bracket is made of resin.

8. The battery cell according to claim 1 or 2, characterized in that, The battery module and the cooling plate are provided in multiple ways. The battery module and the cooling plate are stacked alternately along the first direction.

9. The battery cell according to claim 8, characterized in that, At least one of the plurality of cooling plates has the main plate and the partition plate, the partition plate having the same shape as the sensor bracket and being mounted along the outer edge of the main plate.

10. The battery cell according to claim 1 or 2, characterized in that, The battery unit also includes a pressing unit configured to press the battery module and the cooling plate in the first direction.

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