Battery

Abstract

The main purpose of the present disclosure is to provide a battery capable of detecting the temperature of an electrode body with high precision. In the present disclosure, the above-mentioned problem is solved by providing the following battery, which has an electrode body and an outer body, the outer body having an internal area for accommodating the electrode body, the battery having a temperature detection body configured to extend from the internal area of ​​the outer body to the external area, the temperature detection body having a detection part and a signal line, the detection part is arranged in the internal area and detects the temperature of the electrode body, the signal line is connected to the detection part, an insulating protective layer is provided on the side of the electrode body, and the detection part is arranged on the surface of the insulating protective layer.

Description

Technical Field

[0001] The present disclosure relates to batteries. Background Art

[0002] A battery including an electrode body (a collection of a positive electrode layer, a separator layer, and a negative electrode layer) and a temperature detector is known. For example, Patent Document 1 discloses a battery including a laminate film having an inner resin film, and an inspection portion of a temperature inspection element is held between overlapping inner resin films.

[0003] Prior art literature

[0004] Patent Document 1: Japanese Patent No. 4810990 Summary of the invention

[0005] In Patent Document 1, the inspection portion of the temperature inspection element is held between the overlapped inner resin films, but there is still room for further improvement in inspection (detection) accuracy.

[0006] The present disclosure has been made in view of the above-mentioned actual situation, and a main object of the present disclosure is to provide a battery capable of detecting the temperature of an electrode body with high accuracy.

[0007] In the present disclosure, a battery is provided, comprising an electrode body and an outer body, wherein the outer body has an internal area for accommodating the electrode body, the battery has a temperature detection body, the temperature detection body is configured to extend from the internal area of ​​the outer body to the external area, the temperature detection body has a detection part and a signal line, the detection part is configured in the internal area to detect the temperature of the electrode body, the signal line is connected to the detection part, an insulating protective layer is provided on the side of the electrode body, and the detection part is configured on the surface of the insulating protective layer.

[0008] According to the present disclosure, since the temperature detection body has the detection portion disposed on the surface of the insulating protective layer, the temperature of the electrode body can be directly measured. Therefore, the electrode body temperature can be detected with high accuracy.

[0009] In the above disclosure, the above detection section may be covered with a cover layer.

[0010] In the above disclosure, the temperature detection body may include a plurality of the detection parts.

[0011] In the above disclosure, it may be that: the above-mentioned battery has at least a first electrode body and a second electrode body as the multiple electrode bodies, the above-mentioned first electrode body has an electrode tab P, the above-mentioned second electrode body has an electrode tab R with a polarity opposite to that of the above-mentioned electrode tab P, and the above-mentioned electrode tab P and the above-mentioned electrode tab R are connected in the above-mentioned internal area.

[0012] In the above disclosure, it may be that: the above-mentioned first electrode body and the above-mentioned second electrode body are stacked in the thickness direction via an insulating member, and the above-mentioned first electrode body and the above-mentioned second electrode body respectively have: a negative electrode collector; a first negative electrode layer, a first separator layer, a first positive electrode layer and a first positive electrode collector arranged in sequence from one side of the above-mentioned negative electrode collector; and a second negative electrode layer, a second separator layer, a second positive electrode layer and a second positive electrode collector arranged in sequence from the other side of the above-mentioned negative electrode collector.

[0013] The battery of the present disclosure has the effect of being able to detect the temperature of the electrode body with high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic plan view illustrating a battery in the present disclosure.

[0015] Figure 2 This is a schematic perspective view illustrating a battery and its constituent members in the present disclosure.

[0016] Figure 3 This is a schematic plan view illustrating a temperature detection body in the present disclosure.

[0017] Figure 4 It is a schematic cross-sectional view illustrating a detection unit in the present disclosure.

[0018] Figure 5 It is a schematic cross-sectional view illustrating a detection unit in the present disclosure.

[0019] Figure 6 It is a schematic plan view illustrating a detection unit in the present disclosure.

[0020] Figure 7 It is a schematic cross-sectional view illustrating a detection unit in the present disclosure.

[0021] Figure 8 1 and 2 are schematic plan views and schematic cross-sectional views illustrating an electrode body in the present disclosure.

[0022] Fig. 9 This is a schematic cross-sectional view illustrating an electrode body in the present disclosure.

[0023] Fig.10 This is a schematic cross-sectional view illustrating an electrode body in the present disclosure.

[0024] Description of Reference Numerals

[0025] 1…Negative electrode collector

[0026] 1t…Negative electrode tab

[0027] 2…Negative electrode layer

[0028] 3…Diaphragm layer

[0029] 4… Positive electrode layer

[0030] 5…Positive electrode collector

[0031] 5t…Positive electrode tab

[0032] 10…1st electrode body

[0033] 20…Second electrode body

[0034] 30…Insulating components

[0035] 40…Connecting components

[0036] 50…outer body

[0037] 60…Temperature detection body

[0038] 61…Detection Department

[0039] 62…Signal line

[0040] 70…Insulation protective layer

[0041] 100…Battery DETAILED DESCRIPTION

[0042] Hereinafter, the battery in the present disclosure will be described in detail using the accompanying drawings. The following figures are schematic diagrams, and the size and shape of each part are appropriately exaggerated for easy understanding. In addition, in each figure, the hatching lines representing the cross-section of the component are appropriately omitted. In addition, in this specification, when expressing the way in which other components are configured for a certain component, when simply expressed as "above" or "below", unless otherwise specified, it includes the two situations of configuring other components directly above or below a certain component in a manner of being connected to the certain component, and configuring other components above or below a certain component separated by other components.

[0043] Figure 1 It is a schematic plan view illustrating a battery in the present disclosure. Figure 2 : is a schematic three-dimensional diagram illustrating a battery and its constituent components in the present disclosure. Specifically, Figure 2 (a) Yes Figure 1 A schematic perspective view of the battery shown, Figure 2 (b) means Figure 2 (a) is a schematic perspective view of the components of the battery shown. Figure 2 For the sake of convenience, the temperature detection body is omitted.

[0044] like Figure 1 and Figure 2As shown, the battery 100 includes: a plurality of electrode bodies (a first electrode body 10 and a second electrode body 20), and an outer casing 50 having an inner region I for housing these electrode bodies. The first electrode body 10 has a negative electrode tab 11t (electrode tab P) and a positive electrode tab 15t (electrode tab Q). On the other hand, the second electrode body 20 has a positive electrode tab 25t (electrode tab R) and a negative electrode tab 21t (electrode tab S). The electrode tab P and the electrode tab R are connected in the inner region I by a connecting member 40. In addition, as shown in Figure 1 and Figure 2 As shown, one end of the positive terminal 110 is connected to the positive electrode tab 15t (electrode tab Q) in the internal region I, and the other end of the positive terminal 110 is arranged in the external region O. Similarly, one end of the negative terminal 120 is connected to the negative electrode tab 21t (electrode tab S) in the internal region I, and the other end of the negative terminal 120 is arranged in the external region O.

[0045] In addition, if Figure 1 As shown, the battery 100 has a temperature detection body 60, and the temperature detection body 60 is configured to extend from the internal area I of the outer body 50 to the external area O. The temperature detection body 60 has: a detection part 61 that is configured in the internal area I and detects the temperature of the electrode body (the first electrode body 10, the second electrode body 20), and a signal line 62 connected to the detection part 61. The signal line 62 extends from the internal area I to the external area O, and has an external terminal part (not shown) at the end for connecting to a control substrate. Figure 1 In the embodiment, the signal line 62 is arranged along the length direction of the electrode body.

[0046] Figure 3 This is a schematic plan view illustrating a temperature detection body in the present disclosure, which is equivalent to Figure 1 Magnified view of region X in FIG. In addition, Figure 4 Equivalent to Figure 1 AA cross-section diagram. Figure 3 and Figure 4 As shown, the electrode body (first electrode body 10, second electrode body 20) has an insulating protective layer 70 on its side. In addition, the detection portion 61 of the temperature detection body 60 is arranged on the surface of the insulating protective layer 70. When the electrode body (first electrode body 10, second electrode body 20) is used as a reference, the insulating protective layer 70 and the detection portion 61 are arranged on the side of the electrode body (first electrode body 10, second electrode body 20).

[0047] According to the present disclosure, since the temperature detection body has a detection portion disposed on the surface of the insulating protective layer, the electrode body temperature can be directly measured. Therefore, the electrode body temperature can be detected with high precision. For example, when the electrode body temperature cannot be detected with high precision, it is necessary to consider a large error to set the temperature range in which the battery can be used. In contrast, when the electrode body temperature can be detected with high precision, it is not necessary to consider a large error, so the temperature range in which the battery can be used can be substantially expanded.

[0048] In addition, for example, suppose that the temperature detector is directly arranged on the side of the electrode body. In this case, if the side surfaces of the components constituting the electrode body are not in the same plane, it is difficult to stably fix the temperature detector. For example, in order to suppress short circuits, the area of ​​the negative electrode layer is sometimes designed to be larger than the area of ​​the positive electrode layer. Figure 4 In the embodiment, the area of ​​the first negative electrode layer 12a is larger than the area of ​​the first positive electrode layer 14a, and the end of the first negative electrode layer 12a protrudes more than the end of the first positive electrode layer 14a. Therefore, the side surface of the first negative electrode layer 12a and the side surface of the first positive electrode layer 14a are not in the same plane. In such a state, even if a temperature detection body is directly arranged on the side surface of the first electrode body, it is difficult to stably fix the temperature detection body. In contrast, in the present disclosure, a temperature detection body is arranged on the surface (preferably a flat surface) of the insulating protective layer that protects the side surface of the electrode body, so that the temperature detection body can be stably fixed.

[0049] In addition, for example, suppose that the temperature detection body is arranged on the plane (main surface) of the electrode body. In this case, usually, since the area of ​​the detection part is smaller than the area of ​​the electrode, a step difference may occur, causing electrode cracks and / or uneven battery reaction. In particular, in all-solid batteries that apply strong constraint pressure in the thickness direction, the possibility of adverse conditions becomes higher. In contrast, in the present disclosure, the temperature detection body is arranged on the side instead of on the plane (main surface) of the electrode body, thereby suppressing the occurrence of the above adverse conditions.

[0050] 1. Battery structure

[0051] like Figure 1 As shown, the battery of the present disclosure has a temperature detection body 60, and the temperature detection body 60 is configured to extend from the internal area I of the outer body 50 to the external area O. In addition, the temperature detection body 60 has: a detection part 61 that is arranged in the internal area I and detects the electrode body (the first electrode body 10, the second electrode body 20), and a signal line 62 connected to the detection part 61. As the detection part 61, for example, a temperature sensor such as a thermistor and a thermocouple can be cited.

[0052] In addition, if Figure 4As shown, the electrode body (the first electrode body 10, the second electrode body 20) has an insulating protective layer 70 on its side. By providing the insulating protective layer 70 on the side, it is possible to suppress short circuits and suppress positional deviations of the components constituting the electrode body. As a material for the insulating protective layer, for example, resin can be cited, and as specific examples of the resin, polyurethane acrylate resin, epoxy resin, and olefin resin can be cited. In addition, the resin can be a thermoplastic resin or a cured resin (for example, a cured product of a thermosetting resin or an ultraviolet curable resin). In addition, the detection unit 61 is arranged on the surface of the insulating protective layer 70. For example, the detection unit 61 can be fixed by an adhesive.

[0053] In addition, if Figure 5 As shown, the electrode body (the first electrode body 10, the second electrode body 20) may have an insulating protective layer 70 on its side, and the detection part 61 is arranged on the surface of the insulating protective layer 70, and may be covered by the covering layer 71. By covering the detection part 61 with the covering layer 71, there is an advantage that the mechanical load (such as vibration, impact) applied to the detection part 61 can be reduced. In addition, by covering the detection part 61 with the covering layer 71, there is also an advantage that the damage of the detection part 61 to the outer body can be suppressed. The covering layer 71 only needs to cover at least a part of the surface of the detection part 61 on the opposite side of the insulating protective layer 70, and may also cover the entire surface. As the material of the covering layer, for example, the same material as the material of the insulating protective layer mentioned above can be cited. Figure 5 The structure shown is obtained, for example, by arranging the detection portion 61 on the surface of the insulating protective layer 70 and then forming the covering layer 71 covering the detection portion 61 using a resin that is the same as or different from the resin used in the insulating protective layer 70 .

[0054] The temperature detection body in the present disclosure may have only one detection unit or may have multiple detection units. By providing multiple detection units, it is possible to detect temperature unevenness in the electrode body. By controlling the electrode body according to the detected temperature unevenness, the temperature of the electrode body can be made uniform, for example, the cycle characteristics can be improved. Figure 6 : is a schematic plan view illustrating a detection unit in the present disclosure. Figure 6 For the sake of convenience, the signal line of the temperature detection body is omitted. Figure 6 As shown in (a), the detection units 61 can be respectively arranged in the short side direction D S In addition, if Figure 6 As shown in (b), the detection units 61 may also be arranged in the short side direction D S On the opposite sides, and then, along the length direction D L In addition, along the length direction D L The intervals between the multiple detection units 61 can be equal. Figure 6As shown in (c), the detection unit 61 may also be arranged near the electrode tab (at least one of the negative electrode tab 11t, the positive electrode tab 15t, the negative electrode tab 21t and the positive electrode tab 25t). Since the temperature is likely to rise near the electrode tab, by arranging the detection unit there, for example, temperature abnormality can be accurately detected. Furthermore, the so-called vicinity of the electrode tab refers to a range in which the shortest distance between the electrode tab and the detection unit is less than 5 cm.

[0055] Furthermore, in Figure 6 In (a), the detection units 61 are arranged in the short side direction D S On different sides of the same plate, but not necessarily on the short side D S Two detection units 61 are arranged on opposite sides of the battery. For example, a preliminary experiment or simulation can be conducted in advance to determine the area with the highest temperature (e.g., near the electrode tab) and the area with the lowest temperature when the battery is operating, and at least detection units are arranged in these two places. Figure 6 In (a) to (c), in the short side direction D S A plurality of detection units 61 are arranged on different opposite sides of the upper surface, but in the present disclosure, the detection units 61 may also be arranged on the longitudinal direction D L A single detection unit 61 is arranged or a plurality of detection units 61 are arranged on different sides (parts other than the tabs) facing each other.

[0056] In addition, if Figure 7 As shown, the detection portion 61 of the temperature detection body 60 may be arranged along the thickness direction D of the electrode body (the first electrode body 10 and the second electrode body 20). T is disposed on the surface of the insulating protective layer 70. Figure 7 As shown in FIG. 1 , two detection units 61 may be arranged corresponding to the first electrode body 10 and the second electrode body 20. On the other hand, although not shown in the figure, the detection units 61 may be arranged on the battery surface side (eg, Figure 7 At least one of the vicinity of the first positive electrode collector 15a and the vicinity of the second positive electrode collector 25b), and the central side of the battery (e.g. Figure 7 A plurality of detection units are arranged near the insulating member 30 in the example.

[0057] The battery of the present disclosure includes an electrode body and an outer casing having an inner region for housing the electrode body. The battery of the present disclosure may include only one electrode body or may include a plurality of electrode bodies.

[0058] For example Figure 1 and Figure 2 As shown, the battery 100 may include a first electrode body 10 and a second electrode body 20 as electrode bodies. The first electrode body includes an electrode tab P and an electrode tab Q having a polarity opposite to that of the electrode tab P. For example Figure 1In the embodiment, the electrode tab P is a negative electrode tab, and the electrode tab Q is a positive electrode tab. On the other hand, the second electrode body has an electrode tab R having a polarity opposite to that of the electrode tab P and an electrode tab S having a polarity opposite to that of the electrode tab R. For example Figure 1 In the figure, the electrode tab R is the positive tab, and the electrode tab S is the negative tab. In addition, although not shown, when the electrode tab P is the positive tab, the electrode tab Q is the negative tab, the electrode tab R is the negative tab, and the electrode tab S is the positive tab.

[0059] like Figure 1 As shown, the electrode tabs P and the electrode tabs R may be connected in the inner region I. The term "connected" in the present disclosure means at least electrically connected, and may or may not mean physically connected (contacted) within the scope of no technical contradiction. Figure 1 and Figure 2 As shown, the electrode tab P and the electrode tab R are arranged on the same side of the electrode body and are respectively in contact with the connecting member 40. Thus, the first electrode body 10 and the second electrode body 20 are connected in series. On the other hand, although not shown, the electrode tab P and the electrode tab R may be in direct contact without the connection member.

[0060] In addition, if Figure 2 As shown, the first electrode body 10 and the second electrode body 20 may be separated from each other along the thickness direction D via the insulating member 30. T Stacking. Here, it is assumed that the first current collector located on the side closest to the second electrode body 20 in the first electrode body 10 and the second current collector located on the side closest to the first electrode body 10 in the second electrode body 20 have opposite polarities. For example, it is assumed that the first current collector is a positive electrode collector and the second current collector is a negative electrode collector. In this case, in order to connect the first electrode body 10 and the second electrode body 20 in series, it is sufficient to simply make the first current collector and the second current collector contact each other, and the necessity of providing the insulating member 30 is low.

[0061] On the other hand, it is assumed that the first current collector and the second current collector have the same polarity. In this case, in order to connect the first electrode body 10 and the second electrode body 20 in series, as shown in FIG. Figure 2 As shown, it is preferable to arrange an insulating member 30 between the first electrode body 10 and the second electrode body 20 to connect the electrode tab P and the electrode tab R. In particular, when both the first electrode body and the second electrode body have Fig. 9 In the case of the above structure, that is, the structure having current collectors with the same polarity on both sides, since the first current collector and the second current collector facing each other have the same polarity, it is preferable to arrange an insulating member between the first electrode body and the second electrode body.

[0062] in addition, Figure 4 is a schematic cross-sectional view illustrating a battery in the present disclosure, which is equivalent to Figure 1AA cross-section diagram. Figure 4 In the embodiment, the first electrode body 10 comprises: a negative electrode collector 11; a first negative electrode layer 12a, a first separator layer 13a, a first positive electrode layer 14a, and a first positive electrode collector 15a arranged in order from one surface of the negative electrode collector 11; and a second negative electrode layer 12b, a second separator layer 13b, a second positive electrode layer 14b, and a second positive electrode collector 15b arranged in order from the other surface of the negative electrode collector 11. On the other hand, the second electrode body 20 comprises: a negative electrode collector 21; a first negative electrode layer 22a, a first separator layer 23a, a first positive electrode layer 24a, and a first positive electrode collector 25a arranged in order from one surface of the negative electrode collector 21; and a second negative electrode layer 22b, a second separator layer 23b, a second positive electrode layer 24b, and a second positive electrode collector 25b arranged in order from the other surface of the negative electrode collector 21. Furthermore, an insulating member 30 is disposed between the second positive electrode collector 15 b in the first electrode body 10 and the first positive electrode collector 25 a in the second electrode body 20 .

[0063] As a material of the insulating member, for example, resin can be cited. Specific examples of the resin include polyolefin resins such as polypropylene (PP) and polyethylene (PE), polyimide resins, and polyphenylene sulfide resins (PPS). When viewed from above, the insulating member is preferably larger than the first current collector (the current collector located on the side of the first electrode body 10 closest to the second electrode body 20) and the second current collector (the current collector located on the side of the first electrode body 10 closest to the first electrode body 10). That is, the insulating member preferably includes the first current collector and the second current collector when viewed from above. This is because this can effectively insulate the first current collector from the second current collector. In addition, when viewed from above, the insulating member is preferably larger than the largest current collector in the first electrode body (for example Figure 4 The negative electrode current collector 11 in the second electrode body and the largest current collector in the second electrode body (e.g. Figure 4 The negative electrode current collector 21 in the battery is large. This is because, for example, when the battery is pressurized (constrained) from the outside, it is difficult to cause a short circuit.

[0064] In addition, if Figure 1 As shown, the positive terminal 110 and the negative terminal 120 can be arranged on the same side of the electrode body. In this case, the battery structure can be simplified and the volume energy density can be easily improved. In addition, when the positive terminal 110 and the negative terminal 120 are arranged on the same side of the electrode body, it is preferred that the positive terminal 110 and the negative terminal 120 are not repeatedly arranged when viewed from above. Because this is less likely to cause a short circuit. In addition, the lead-out portion of the temperature detection body 60 (the portion of the temperature detection body 60 that is led out from the inside of the outer body 50 to the outside) can also be arranged on the same side mentioned above. In this case, it is easier to improve the volume energy density. In addition, the lead-out portion of the temperature detection body may not be arranged on the same side mentioned above. The positive terminal and the negative terminal can be arranged on different opposite sides of the electrode body.

[0065] When the number of electrode bodies included in the battery of the present disclosure is N, the number N may be 1, 2, or 3 or more. On the other hand, the number N is, for example, 100 or less. When the battery of the present disclosure has the first electrode body to the Nth electrode body (2≤N), the electrode tab T in the N-1th electrode body N-1 and the electrode tab T in the Nth electrode body N The electrode tab T can be connected in the inner area of ​​the outer casing. N-1 And electrode tab T N The first electrode body to the Nth electrode body are preferably the same member. The battery in the present disclosure may include a plurality of insulating members, each of which is disposed between adjacent electrode bodies.

[0066] 2. Structure of the electrode body

[0067] Figure 8 (a) is a schematic plan view illustrating an electrode body in the present disclosure, Figure 8 (b) Yes Figure 8 (a) Side view. Figure 8 The electrode body E shown in (a) and (b) comprises: a positive electrode layer 4, a negative electrode layer 2, a separator layer 3 formed between the positive electrode layer 4 and the negative electrode layer 2, a positive electrode collector 5 for collecting current from the positive electrode layer 4, and a negative electrode collector 1 for collecting current from the negative electrode layer 2. When viewed from above, the positive electrode collector 5 has a positive electrode tab 5t at a position that does not overlap with the positive electrode layer 4. Similarly, when viewed from above, the negative electrode collector 1 has a negative electrode tab 1t at a position that does not overlap with the negative electrode layer 2. The positive electrode collector 5 and the positive electrode tab 5t only need to be electrically connected, and may be the same component or different components. The same applies to the negative electrode collector 1 and the negative electrode tab 1t.

[0068] In addition, if Figure 8 As shown in (a), the positive electrode tab 5t and the negative electrode tab 1t can be respectively arranged on different opposite sides (side s1, side s2) when viewed from above (double-sided tab structure). On the other hand, although not shown in the figure, the positive electrode tab and the negative electrode tab can also be respectively arranged on the same side (single-sided tab structure). In addition, the top view shape of the electrode body (the top view shape excluding the positive electrode tab and the negative electrode tab) is, for example, a rectangle. Figure 8 As shown in (a), the plan view shape of the electrode body E excluding the positive electrode tab 5t and the negative electrode tab 1t is a rectangle. The positive electrode tab 5t and the negative electrode tab 1t are arranged to face each other in the longitudinal direction of the electrode body E.

[0069] The electrode body in the present disclosure may have one power generation unit including a positive electrode layer, a separator layer, and a negative electrode layer, may have two, or may have three or more. When the electrode body has a plurality of power generation units, they may be connected in parallel or in series.

[0070] Fig. 9 It is a schematic cross-sectional view illustrating an electrode body in the present disclosure, and is a schematic cross-sectional view showing a state where a plurality of power generation units are connected in parallel. Fig. 9 The electrode body E shown has: a negative electrode collector 1; a first negative electrode layer 2a, a first separator layer 3a, a first positive electrode layer 4a, and a first positive electrode collector 5a arranged in sequence from one surface s11 of the negative electrode collector 1; and a second negative electrode layer 2b, a second separator layer 3b, a second positive electrode layer 4b, and a second positive electrode collector 5b arranged in sequence from the other surface s12 of the negative electrode collector 1. The first positive electrode collector 5a and the second positive electrode collector 5b are connected to form a positive electrode tab 5t. In addition, an insulating protective layer 7 is arranged between the second positive electrode collector 5b and the side of the negative electrode (negative electrode collector 1, first negative electrode layer 2a, second negative electrode layer 2b) to prevent short circuit.

[0071] Fig. 9 The electrode body E shown is useful as an electrode body used in an all-solid battery containing an inorganic solid electrolyte such as an oxide solid electrolyte or a sulfide solid electrolyte. In an all-solid battery containing an inorganic solid electrolyte, the electrode body needs to be pressed at a very high pressure in order to form a good ion conduction path. In this case, Fig. 9 The electrode body E shown is based on the negative electrode current collector 1, and the structure of other layers is symmetrical, so it has the advantage that stress caused by the different elasticity of the positive electrode layer and the negative electrode layer is difficult to generate. Specifically, Fig. 9 The electrode body E shown is based on the negative electrode collector 1, and has the first negative electrode layer 2a, the first separator layer 3a, the first positive electrode layer 4a and the first positive electrode collector 5a arranged in sequence on one surface s11, and has the second negative electrode layer 2b, the second separator layer 3b, the second positive electrode layer 4b and the second positive electrode collector 5b arranged in sequence on the other surface s12. In this way, the structures of the other layers are symmetrical based on the negative electrode collector 1, so it is difficult to generate stress caused by the different elasticity of the positive electrode layer and the negative electrode layer. As a result, the occurrence of fracture of the negative electrode collector and the occurrence of cracks in the positive electrode layer and the negative electrode layer can be suppressed. In addition, in the present disclosure, multiple Fig. 9 The electrode bodies E shown are stacked in the thickness direction to form an electrode body E'. At this time, the relative positive electrode collectors (the first positive electrode collector 5a in one electrode body E and the second positive electrode collector 5b in another electrode body E) can be different components from each other or the same component (or they can share a common positive electrode collector).

[0072] in addition, Fig. 9The electrode body E shown has two positive electrode collectors relative to one negative electrode collector. On the other hand, the electrode body in the present disclosure may also have two negative electrode collectors relative to one positive electrode collector. That is, the electrode body of the present disclosure may have: a positive electrode collector; a first positive electrode layer, a first separator layer, a first negative electrode layer, and a first negative electrode collector arranged in sequence from one surface of the above-mentioned positive electrode collector; and a second positive electrode layer, a second separator layer, a second negative electrode layer, and a second negative electrode collector arranged in sequence from the other surface of the positive electrode collector. In this case, the first negative electrode collector and the second negative electrode collector can be connected to form a negative electrode tab.

[0073] Fig.10 It is a schematic cross-sectional view illustrating an electrode body in the present disclosure, and is a schematic cross-sectional view showing a state where a plurality of power generation units are connected in series. Fig.10 The electrode body E shown has a power generation unit A and a power generation unit B. The power generation unit A has a first positive electrode layer 4a, a first separator layer 3a and a first negative electrode layer 2a, and the power generation unit B has a second positive electrode layer 4b, a second separator layer 3b and a second negative electrode layer 2b. The first positive electrode layer 4a in the power generation unit A is connected to the positive electrode collector 5, and the second negative electrode layer 2b in the power generation unit B is connected to the negative electrode collector 1. In addition, the first negative electrode layer 2a in the power generation unit A and the second positive electrode layer 4b in the power generation unit B are electrically connected via an intermediate collector 6.

[0074] The positive electrode layer contains at least a positive electrode active material. In addition, the positive electrode layer may also contain at least one of a conductive material, an electrolyte, and a binder. Examples of the positive electrode active material include oxide active materials. Examples of the oxide active material include LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 Rock salt layer type active materials, LiMn 2 O 4 Spinel active materials, LiFePO 4 Olivine-type active materials such as iodine. In addition, sulfur (S) can also be used as the positive electrode active material. The shape of the positive electrode active material is, for example, a particle. As the conductive material, for example, a carbon material can be mentioned. The electrolyte can be a liquid electrolyte or a solid electrolyte (electrolyte). The liquid electrolyte (electrolyte) contains, for example, LiPF 6 The solid electrolyte may be an organic solid electrolyte such as a gel electrolyte, or an inorganic solid electrolyte such as an oxide solid electrolyte or a sulfide solid electrolyte. In addition, as the binder, for example, a rubber-based binder or a fluoride-based binder may be mentioned.

[0075] The negative electrode layer contains at least a negative electrode active material. In addition, the negative electrode layer may also contain at least one of a conductive material, an electrolyte, and a binder. Examples of the negative electrode active material include metal active materials such as Li and Si, carbon active materials such as graphite, and Li 4 Ti 5 O 12 Oxide active materials such as aluminum and aluminum. The shape of the negative electrode active material is, for example, particulate or foil-shaped. The conductive material, electrolyte, and binder are the same as above. The separator layer contains at least an electrolyte. The electrolyte can be a liquid electrolyte or a solid electrolyte. In addition, examples of materials for the positive electrode collector include aluminum, SUS, nickel, and carbon. Examples of materials for the negative electrode collector include copper, SUS, nickel, and carbon. The shape of the positive electrode collector and the negative electrode collector is, for example, foil-shaped.

[0076] 3. Battery

[0077] The battery disclosed in the present invention has an outer body, and the outer body has an internal area for accommodating an electrode body. The outer body may be flexible or inflexible. As an example of the former, an aluminum laminate film may be cited, and as an example of the latter, a SUS shell may be cited. In addition, when the outer body is a laminate film, there may also be a sealed area between the inner area and the outer area of ​​the outer body where the inner resin layers of the laminate film are fused to each other.

[0078] In addition, the type of battery in the present disclosure is not particularly limited, and a typical example is a lithium-ion secondary battery. Moreover, the use of the battery in the present disclosure is not particularly limited. Although the use of the battery is not particularly limited, for example, the power supply of vehicles such as hybrid vehicles, electric vehicles, gasoline vehicles, and diesel vehicles can be cited. It is particularly preferred to be used as a driving power supply for hybrid vehicles or electric vehicles. In addition, the battery in the present disclosure can be used as a power supply for mobile bodies other than vehicles (such as railways, ships, and aircraft), and can also be used as a power supply for electrical appliances such as information processing devices.

[0079] The present disclosure is not limited to the above-mentioned embodiments. The above-mentioned embodiments are illustrative, and all schemes having substantially the same technical concept as that described in the claims of the present disclosure and having the same functions and effects are included in the technical scope of the present disclosure.

Claims

1. A battery comprising an electrode body and an outer casing, wherein the outer casing has an inner region for accommodating the electrode body. The battery has a temperature detection body, and the temperature detection body is arranged to extend from the inner region of the outer body to the outer region. The temperature detection body has a detection part and a signal line. The detection part is arranged in the internal area and detects the temperature of the electrode body. The signal line is connected to the detection part. The electrode body has a first side surface and a second side surface opposite to the first side surface, The electrode body includes a first insulating protective layer disposed on the first side surface and a second insulating protective layer physically separated from the first insulating protective layer and disposed on the second side surface. The first insulating protective layer and the second insulating protective layer are respectively arranged along the side surfaces of the concavo-convex shape of the electrode body. The detection unit is arranged on a surface of at least one of the first insulating protective layer and the second insulating protective layer. 2 . The battery according to claim 1 , wherein the detection portion is covered with a covering layer, and the covering layer is arranged on the entire side surface of the first insulating protective layer and / or the second insulating protective layer where the detection portion is arranged. 3 . The battery according to claim 1 , wherein the temperature detection body has a plurality of the detection portions, and the plurality of detection portions are respectively arranged on the first side surface and the second side surface that are opposed to each other in the short-side direction of the electrode body.

4. The battery according to claim 1 or 2, The battery includes at least a first electrode body and a second electrode body as the plurality of electrode bodies. The first electrode body has an electrode tab P. The second electrode body has an electrode tab R having a polarity opposite to that of the electrode tab P. The electrode tab P and the electrode tab R are connected in the inner region.

5. The battery according to claim 4, The first electrode body and the second electrode body are stacked in a thickness direction via an insulating member. The first electrode body and the second electrode body each have: A negative electrode current collector; A first negative electrode layer, a first separator layer, a first positive electrode layer, and a first positive electrode collector are sequentially arranged from one surface of the negative electrode collector; and A second negative electrode layer, a second separator layer, a second positive electrode layer, and a second positive electrode collector are disposed in order from the other surface of the negative electrode collector.

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